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Diffstat (limited to 'fs/nfsd/nfs4state.c')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 9705 |
1 files changed, 9705 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c new file mode 100644 index 000000000..a42f34842 --- /dev/null +++ b/fs/nfsd/nfs4state.c @@ -0,0 +1,9705 @@ +/* +* Copyright (c) 2001 The Regents of the University of Michigan. +* All rights reserved. +* +* Kendrick Smith <kmsmith@umich.edu> +* Andy Adamson <kandros@umich.edu> +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions +* are met: +* +* 1. Redistributions of source code must retain the above copyright +* notice, this list of conditions and the following disclaimer. +* 2. Redistributions in binary form must reproduce the above copyright +* notice, this list of conditions and the following disclaimer in the +* documentation and/or other materials provided with the distribution. +* 3. Neither the name of the University nor the names of its +* contributors may be used to endorse or promote products derived +* from this software without specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED +* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR +* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +* +*/ + +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/namei.h> +#include <linux/swap.h> +#include <linux/pagemap.h> +#include <linux/ratelimit.h> +#include <linux/sunrpc/svcauth_gss.h> +#include <linux/sunrpc/addr.h> +#include <linux/jhash.h> +#include <linux/string_helpers.h> +#include <linux/fsnotify.h> +#include <linux/rhashtable.h> +#include <linux/nfs_ssc.h> + +#include "xdr4.h" +#include "xdr4cb.h" +#include "vfs.h" +#include "current_stateid.h" + +#include "netns.h" +#include "pnfs.h" +#include "filecache.h" +#include "trace.h" + +#define NFSDDBG_FACILITY NFSDDBG_PROC + +#define all_ones {{ ~0, ~0}, ~0} +static const stateid_t one_stateid = { + .si_generation = ~0, + .si_opaque = all_ones, +}; +static const stateid_t zero_stateid = { + /* all fields zero */ +}; +static const stateid_t currentstateid = { + .si_generation = 1, +}; +static const stateid_t close_stateid = { + .si_generation = 0xffffffffU, +}; + +static u64 current_sessionid = 1; + +bool nfsd_delegts_enabled __read_mostly = true; + +#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t))) +#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t))) +#define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t))) +#define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t))) + +/* forward declarations */ +static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner); +static void nfs4_free_ol_stateid(struct nfs4_stid *stid); +static void nfsd4_end_grace(struct nfsd_net *nn); +static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps); +static void nfsd4_file_hash_remove(struct nfs4_file *fi); +static void deleg_reaper(struct nfsd_net *nn); + +/* Locking: */ + +enum nfsd4_st_mutex_lock_subclass { + OPEN_STATEID_MUTEX = 0, + LOCK_STATEID_MUTEX = 1, +}; + +/* + * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for + * the refcount on the open stateid to drop. + */ +static DECLARE_WAIT_QUEUE_HEAD(close_wq); + +/* + * A waitqueue where a writer to clients/#/ctl destroying a client can + * wait for cl_rpc_users to drop to 0 and then for the client to be + * unhashed. + */ +static DECLARE_WAIT_QUEUE_HEAD(expiry_wq); + +static struct kmem_cache *client_slab; +static struct kmem_cache *openowner_slab; +static struct kmem_cache *lockowner_slab; +static struct kmem_cache *file_slab; +static struct kmem_cache *stateid_slab; +static struct kmem_cache *deleg_slab; +static struct kmem_cache *odstate_slab; + +static void free_session(struct nfsd4_session *); + +static const struct nfsd4_callback_ops nfsd4_cb_recall_ops; +static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops; +static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops; + +static struct workqueue_struct *laundry_wq; + +int nfsd4_create_laundry_wq(void) +{ + int rc = 0; + + laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4"); + if (laundry_wq == NULL) + rc = -ENOMEM; + return rc; +} + +void nfsd4_destroy_laundry_wq(void) +{ + destroy_workqueue(laundry_wq); +} + +static bool is_session_dead(struct nfsd4_session *ses) +{ + return ses->se_dead; +} + +static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me) +{ + if (atomic_read(&ses->se_ref) > ref_held_by_me) + return nfserr_jukebox; + ses->se_dead = true; + return nfs_ok; +} + +static bool is_client_expired(struct nfs4_client *clp) +{ + return clp->cl_time == 0; +} + +static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn, + struct nfs4_client *clp) +{ + if (clp->cl_state != NFSD4_ACTIVE) + atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0); +} + +static __be32 get_client_locked(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + if (is_client_expired(clp)) + return nfserr_expired; + atomic_inc(&clp->cl_rpc_users); + nfsd4_dec_courtesy_client_count(nn, clp); + clp->cl_state = NFSD4_ACTIVE; + return nfs_ok; +} + +/* must be called under the client_lock */ +static inline void +renew_client_locked(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + if (is_client_expired(clp)) { + WARN_ON(1); + printk("%s: client (clientid %08x/%08x) already expired\n", + __func__, + clp->cl_clientid.cl_boot, + clp->cl_clientid.cl_id); + return; + } + + list_move_tail(&clp->cl_lru, &nn->client_lru); + clp->cl_time = ktime_get_boottime_seconds(); + nfsd4_dec_courtesy_client_count(nn, clp); + clp->cl_state = NFSD4_ACTIVE; +} + +static void put_client_renew_locked(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + if (!atomic_dec_and_test(&clp->cl_rpc_users)) + return; + if (!is_client_expired(clp)) + renew_client_locked(clp); + else + wake_up_all(&expiry_wq); +} + +static void put_client_renew(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock)) + return; + if (!is_client_expired(clp)) + renew_client_locked(clp); + else + wake_up_all(&expiry_wq); + spin_unlock(&nn->client_lock); +} + +static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses) +{ + __be32 status; + + if (is_session_dead(ses)) + return nfserr_badsession; + status = get_client_locked(ses->se_client); + if (status) + return status; + atomic_inc(&ses->se_ref); + return nfs_ok; +} + +static void nfsd4_put_session_locked(struct nfsd4_session *ses) +{ + struct nfs4_client *clp = ses->se_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses)) + free_session(ses); + put_client_renew_locked(clp); +} + +static void nfsd4_put_session(struct nfsd4_session *ses) +{ + struct nfs4_client *clp = ses->se_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + spin_lock(&nn->client_lock); + nfsd4_put_session_locked(ses); + spin_unlock(&nn->client_lock); +} + +static struct nfsd4_blocked_lock * +find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh, + struct nfsd_net *nn) +{ + struct nfsd4_blocked_lock *cur, *found = NULL; + + spin_lock(&nn->blocked_locks_lock); + list_for_each_entry(cur, &lo->lo_blocked, nbl_list) { + if (fh_match(fh, &cur->nbl_fh)) { + list_del_init(&cur->nbl_list); + WARN_ON(list_empty(&cur->nbl_lru)); + list_del_init(&cur->nbl_lru); + found = cur; + break; + } + } + spin_unlock(&nn->blocked_locks_lock); + if (found) + locks_delete_block(&found->nbl_lock); + return found; +} + +static struct nfsd4_blocked_lock * +find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh, + struct nfsd_net *nn) +{ + struct nfsd4_blocked_lock *nbl; + + nbl = find_blocked_lock(lo, fh, nn); + if (!nbl) { + nbl = kmalloc_obj(*nbl); + if (nbl) { + INIT_LIST_HEAD(&nbl->nbl_list); + INIT_LIST_HEAD(&nbl->nbl_lru); + fh_copy_shallow(&nbl->nbl_fh, fh); + locks_init_lock(&nbl->nbl_lock); + kref_init(&nbl->nbl_kref); + nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client, + &nfsd4_cb_notify_lock_ops, + NFSPROC4_CLNT_CB_NOTIFY_LOCK); + } + } + return nbl; +} + +static void +free_nbl(struct kref *kref) +{ + struct nfsd4_blocked_lock *nbl; + + nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref); + locks_release_private(&nbl->nbl_lock); + kfree(nbl); +} + +static void +free_blocked_lock(struct nfsd4_blocked_lock *nbl) +{ + locks_delete_block(&nbl->nbl_lock); + kref_put(&nbl->nbl_kref, free_nbl); +} + +static void +remove_blocked_locks(struct nfs4_lockowner *lo) +{ + struct nfs4_client *clp = lo->lo_owner.so_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + struct nfsd4_blocked_lock *nbl; + LIST_HEAD(reaplist); + + /* Dequeue all blocked locks */ + spin_lock(&nn->blocked_locks_lock); + while (!list_empty(&lo->lo_blocked)) { + nbl = list_first_entry(&lo->lo_blocked, + struct nfsd4_blocked_lock, + nbl_list); + list_del_init(&nbl->nbl_list); + WARN_ON(list_empty(&nbl->nbl_lru)); + list_move(&nbl->nbl_lru, &reaplist); + } + spin_unlock(&nn->blocked_locks_lock); + + /* Now free them */ + while (!list_empty(&reaplist)) { + nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock, + nbl_lru); + list_del_init(&nbl->nbl_lru); + free_blocked_lock(nbl); + } +} + +static void +nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb) +{ + struct nfsd4_blocked_lock *nbl = container_of(cb, + struct nfsd4_blocked_lock, nbl_cb); + locks_delete_block(&nbl->nbl_lock); +} + +static int +nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task) +{ + trace_nfsd_cb_notify_lock_done(&zero_stateid, task); + + /* + * Since this is just an optimization, we don't try very hard if it + * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and + * just quit trying on anything else. + */ + switch (task->tk_status) { + case -NFS4ERR_DELAY: + rpc_delay(task, 1 * HZ); + return 0; + default: + return 1; + } +} + +static void +nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb) +{ + struct nfsd4_blocked_lock *nbl = container_of(cb, + struct nfsd4_blocked_lock, nbl_cb); + + free_blocked_lock(nbl); +} + +static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = { + .prepare = nfsd4_cb_notify_lock_prepare, + .done = nfsd4_cb_notify_lock_done, + .release = nfsd4_cb_notify_lock_release, + .opcode = OP_CB_NOTIFY_LOCK, +}; + +/* + * We store the NONE, READ, WRITE, and BOTH bits separately in the + * st_{access,deny}_bmap field of the stateid, in order to track not + * only what share bits are currently in force, but also what + * combinations of share bits previous opens have used. This allows us + * to enforce the recommendation in + * https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that + * the server return an error if the client attempt to downgrade to a + * combination of share bits not explicable by closing some of its + * previous opens. + * + * This enforcement is arguably incomplete, since we don't keep + * track of access/deny bit combinations; so, e.g., we allow: + * + * OPEN allow read, deny write + * OPEN allow both, deny none + * DOWNGRADE allow read, deny none + * + * which we should reject. + * + * But you could also argue that our current code is already overkill, + * since it only exists to return NFS4ERR_INVAL on incorrect client + * behavior. + */ +static unsigned int +bmap_to_share_mode(unsigned long bmap) +{ + int i; + unsigned int access = 0; + + for (i = 1; i < 4; i++) { + if (test_bit(i, &bmap)) + access |= i; + } + return access; +} + +/* set share access for a given stateid */ +static inline void +set_access(u32 access, struct nfs4_ol_stateid *stp) +{ + unsigned char mask = 1 << access; + + WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); + stp->st_access_bmap |= mask; +} + +/* clear share access for a given stateid */ +static inline void +clear_access(u32 access, struct nfs4_ol_stateid *stp) +{ + unsigned char mask = 1 << access; + + WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); + stp->st_access_bmap &= ~mask; +} + +/* test whether a given stateid has access */ +static inline bool +test_access(u32 access, struct nfs4_ol_stateid *stp) +{ + unsigned char mask = 1 << access; + + return (bool)(stp->st_access_bmap & mask); +} + +/* set share deny for a given stateid */ +static inline void +set_deny(u32 deny, struct nfs4_ol_stateid *stp) +{ + unsigned char mask = 1 << deny; + + WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); + stp->st_deny_bmap |= mask; +} + +/* clear share deny for a given stateid */ +static inline void +clear_deny(u32 deny, struct nfs4_ol_stateid *stp) +{ + unsigned char mask = 1 << deny; + + WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); + stp->st_deny_bmap &= ~mask; +} + +/* test whether a given stateid is denying specific access */ +static inline bool +test_deny(u32 deny, struct nfs4_ol_stateid *stp) +{ + unsigned char mask = 1 << deny; + + return (bool)(stp->st_deny_bmap & mask); +} + +static int nfs4_access_to_omode(u32 access) +{ + switch (access & NFS4_SHARE_ACCESS_BOTH) { + case NFS4_SHARE_ACCESS_READ: + return O_RDONLY; + case NFS4_SHARE_ACCESS_WRITE: + return O_WRONLY; + case NFS4_SHARE_ACCESS_BOTH: + return O_RDWR; + } + WARN_ON_ONCE(1); + return O_RDONLY; +} + +static inline int +access_permit_read(struct nfs4_ol_stateid *stp) +{ + return test_access(NFS4_SHARE_ACCESS_READ, stp) || + test_access(NFS4_SHARE_ACCESS_BOTH, stp) || + test_access(NFS4_SHARE_ACCESS_WRITE, stp); +} + +static inline int +access_permit_write(struct nfs4_ol_stateid *stp) +{ + return test_access(NFS4_SHARE_ACCESS_WRITE, stp) || + test_access(NFS4_SHARE_ACCESS_BOTH, stp); +} + +static inline struct nfs4_stateowner * +nfs4_get_stateowner(struct nfs4_stateowner *sop) +{ + atomic_inc(&sop->so_count); + return sop; +} + +static int +same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner) +{ + return (sop->so_owner.len == owner->len) && + 0 == memcmp(sop->so_owner.data, owner->data, owner->len); +} + +static struct nfs4_openowner * +find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, + struct nfs4_client *clp) +{ + struct nfs4_stateowner *so; + + lockdep_assert_held(&clp->cl_lock); + + list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval], + so_strhash) { + if (!so->so_is_open_owner) + continue; + if (same_owner_str(so, &open->op_owner)) + return openowner(nfs4_get_stateowner(so)); + } + return NULL; +} + +static inline u32 +opaque_hashval(const void *ptr, int nbytes) +{ + unsigned char *cptr = (unsigned char *) ptr; + + u32 x = 0; + while (nbytes--) { + x *= 37; + x += *cptr++; + } + return x; +} + +void +put_nfs4_file(struct nfs4_file *fi) +{ + if (refcount_dec_and_test(&fi->fi_ref)) { + nfsd4_file_hash_remove(fi); + WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate)); + WARN_ON_ONCE(!list_empty(&fi->fi_delegations)); + kfree_rcu(fi, fi_rcu); + } +} + +static struct nfsd_file * +find_writeable_file_locked(struct nfs4_file *f) +{ + struct nfsd_file *ret; + + lockdep_assert_held(&f->fi_lock); + + ret = nfsd_file_get(f->fi_fds[O_WRONLY]); + if (!ret) + ret = nfsd_file_get(f->fi_fds[O_RDWR]); + return ret; +} + +static struct nfsd_file * +find_writeable_file(struct nfs4_file *f) +{ + struct nfsd_file *ret; + + spin_lock(&f->fi_lock); + ret = find_writeable_file_locked(f); + spin_unlock(&f->fi_lock); + + return ret; +} + +static struct nfsd_file * +find_readable_file_locked(struct nfs4_file *f) +{ + struct nfsd_file *ret; + + lockdep_assert_held(&f->fi_lock); + + ret = nfsd_file_get(f->fi_fds[O_RDONLY]); + if (!ret) + ret = nfsd_file_get(f->fi_fds[O_RDWR]); + return ret; +} + +static struct nfsd_file * +find_readable_file(struct nfs4_file *f) +{ + struct nfsd_file *ret; + + spin_lock(&f->fi_lock); + ret = find_readable_file_locked(f); + spin_unlock(&f->fi_lock); + + return ret; +} + +struct nfsd_file * +find_any_file(struct nfs4_file *f) +{ + struct nfsd_file *ret; + + if (!f) + return NULL; + spin_lock(&f->fi_lock); + ret = nfsd_file_get(f->fi_fds[O_RDWR]); + if (!ret) { + ret = nfsd_file_get(f->fi_fds[O_WRONLY]); + if (!ret) + ret = nfsd_file_get(f->fi_fds[O_RDONLY]); + } + spin_unlock(&f->fi_lock); + return ret; +} + +static struct nfsd_file *find_any_file_locked(struct nfs4_file *f) +{ + lockdep_assert_held(&f->fi_lock); + + if (f->fi_fds[O_RDWR]) + return f->fi_fds[O_RDWR]; + if (f->fi_fds[O_WRONLY]) + return f->fi_fds[O_WRONLY]; + if (f->fi_fds[O_RDONLY]) + return f->fi_fds[O_RDONLY]; + return NULL; +} + +static atomic_long_t num_delegations; +unsigned long max_delegations; + +/* + * Open owner state (share locks) + */ + +/* hash tables for lock and open owners */ +#define OWNER_HASH_BITS 8 +#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) +#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) + +static unsigned int ownerstr_hashval(struct xdr_netobj *ownername) +{ + unsigned int ret; + + ret = opaque_hashval(ownername->data, ownername->len); + return ret & OWNER_HASH_MASK; +} + +static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp; + +static const struct rhashtable_params nfs4_file_rhash_params = { + .key_len = sizeof_field(struct nfs4_file, fi_inode), + .key_offset = offsetof(struct nfs4_file, fi_inode), + .head_offset = offsetof(struct nfs4_file, fi_rlist), + + /* + * Start with a single page hash table to reduce resizing churn + * on light workloads. + */ + .min_size = 256, + .automatic_shrinking = true, +}; + +/* + * Check if courtesy clients have conflicting access and resolve it if possible + * + * access: is op_share_access if share_access is true. + * Check if access mode, op_share_access, would conflict with + * the current deny mode of the file 'fp'. + * access: is op_share_deny if share_access is false. + * Check if the deny mode, op_share_deny, would conflict with + * current access of the file 'fp'. + * stp: skip checking this entry. + * new_stp: normal open, not open upgrade. + * + * Function returns: + * false - access/deny mode conflict with normal client. + * true - no conflict or conflict with courtesy client(s) is resolved. + */ +static bool +nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp, + struct nfs4_ol_stateid *stp, u32 access, bool share_access) +{ + struct nfs4_ol_stateid *st; + bool resolvable = true; + unsigned char bmap; + struct nfsd_net *nn; + struct nfs4_client *clp; + + lockdep_assert_held(&fp->fi_lock); + list_for_each_entry(st, &fp->fi_stateids, st_perfile) { + /* ignore lock stateid */ + if (st->st_openstp) + continue; + if (st == stp && new_stp) + continue; + /* check file access against deny mode or vice versa */ + bmap = share_access ? st->st_deny_bmap : st->st_access_bmap; + if (!(access & bmap_to_share_mode(bmap))) + continue; + clp = st->st_stid.sc_client; + if (try_to_expire_client(clp)) + continue; + resolvable = false; + break; + } + if (resolvable) { + clp = stp->st_stid.sc_client; + nn = net_generic(clp->net, nfsd_net_id); + mod_delayed_work(laundry_wq, &nn->laundromat_work, 0); + } + return resolvable; +} + +static void +__nfs4_file_get_access(struct nfs4_file *fp, u32 access) +{ + lockdep_assert_held(&fp->fi_lock); + + if (access & NFS4_SHARE_ACCESS_WRITE) + atomic_inc(&fp->fi_access[O_WRONLY]); + if (access & NFS4_SHARE_ACCESS_READ) + atomic_inc(&fp->fi_access[O_RDONLY]); +} + +static __be32 +nfs4_file_get_access(struct nfs4_file *fp, u32 access) +{ + lockdep_assert_held(&fp->fi_lock); + + /* Does this access mode make sense? */ + if (access & ~NFS4_SHARE_ACCESS_BOTH) + return nfserr_inval; + + /* Does it conflict with a deny mode already set? */ + if ((access & fp->fi_share_deny) != 0) + return nfserr_share_denied; + + __nfs4_file_get_access(fp, access); + return nfs_ok; +} + +static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny) +{ + /* Common case is that there is no deny mode. */ + if (deny) { + /* Does this deny mode make sense? */ + if (deny & ~NFS4_SHARE_DENY_BOTH) + return nfserr_inval; + + if ((deny & NFS4_SHARE_DENY_READ) && + atomic_read(&fp->fi_access[O_RDONLY])) + return nfserr_share_denied; + + if ((deny & NFS4_SHARE_DENY_WRITE) && + atomic_read(&fp->fi_access[O_WRONLY])) + return nfserr_share_denied; + } + return nfs_ok; +} + +static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) +{ + might_lock(&fp->fi_lock); + + if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) { + struct nfsd_file *f1 = NULL; + struct nfsd_file *f2 = NULL; + + swap(f1, fp->fi_fds[oflag]); + if (atomic_read(&fp->fi_access[1 - oflag]) == 0) + swap(f2, fp->fi_fds[O_RDWR]); + spin_unlock(&fp->fi_lock); + if (f1) + nfsd_file_put(f1); + if (f2) + nfsd_file_put(f2); + } +} + +static void nfs4_file_put_access(struct nfs4_file *fp, u32 access) +{ + WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH); + + if (access & NFS4_SHARE_ACCESS_WRITE) + __nfs4_file_put_access(fp, O_WRONLY); + if (access & NFS4_SHARE_ACCESS_READ) + __nfs4_file_put_access(fp, O_RDONLY); +} + +/* + * Allocate a new open/delegation state counter. This is needed for + * pNFS for proper return on close semantics. + * + * Note that we only allocate it for pNFS-enabled exports, otherwise + * all pointers to struct nfs4_clnt_odstate are always NULL. + */ +static struct nfs4_clnt_odstate * +alloc_clnt_odstate(struct nfs4_client *clp) +{ + struct nfs4_clnt_odstate *co; + + co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL); + if (co) { + co->co_client = clp; + refcount_set(&co->co_odcount, 1); + } + return co; +} + +static void +hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co) +{ + struct nfs4_file *fp = co->co_file; + + lockdep_assert_held(&fp->fi_lock); + list_add(&co->co_perfile, &fp->fi_clnt_odstate); +} + +static inline void +get_clnt_odstate(struct nfs4_clnt_odstate *co) +{ + if (co) + refcount_inc(&co->co_odcount); +} + +static void +put_clnt_odstate(struct nfs4_clnt_odstate *co) +{ + struct nfs4_file *fp; + + if (!co) + return; + + fp = co->co_file; + if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) { + list_del(&co->co_perfile); + spin_unlock(&fp->fi_lock); + + nfsd4_return_all_file_layouts(co->co_client, fp); + kmem_cache_free(odstate_slab, co); + } +} + +static struct nfs4_clnt_odstate * +find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new) +{ + struct nfs4_clnt_odstate *co; + struct nfs4_client *cl; + + if (!new) + return NULL; + + cl = new->co_client; + + spin_lock(&fp->fi_lock); + list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) { + if (co->co_client == cl) { + get_clnt_odstate(co); + goto out; + } + } + co = new; + co->co_file = fp; + hash_clnt_odstate_locked(new); +out: + spin_unlock(&fp->fi_lock); + return co; +} + +struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab, + void (*sc_free)(struct nfs4_stid *)) +{ + struct nfs4_stid *stid; + int new_id; + + stid = kmem_cache_zalloc(slab, GFP_KERNEL); + if (!stid) + return NULL; + + idr_preload(GFP_KERNEL); + spin_lock(&cl->cl_lock); + /* Reserving 0 for start of file in nfsdfs "states" file: */ + new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT); + spin_unlock(&cl->cl_lock); + idr_preload_end(); + if (new_id < 0) + goto out_free; + + stid->sc_free = sc_free; + stid->sc_client = cl; + stid->sc_stateid.si_opaque.so_id = new_id; + stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid; + /* Will be incremented before return to client: */ + refcount_set(&stid->sc_count, 1); + spin_lock_init(&stid->sc_lock); + INIT_LIST_HEAD(&stid->sc_cp_list); + + return stid; +out_free: + kmem_cache_free(slab, stid); + return NULL; +} + +/* + * Create a unique stateid_t to represent each COPY. + */ +static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid, + unsigned char cs_type) +{ + int new_id; + + stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time; + stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id; + + idr_preload(GFP_KERNEL); + spin_lock(&nn->s2s_cp_lock); + new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT); + stid->cs_stid.si_opaque.so_id = new_id; + stid->cs_stid.si_generation = 1; + spin_unlock(&nn->s2s_cp_lock); + idr_preload_end(); + if (new_id < 0) + return 0; + stid->cs_type = cs_type; + return 1; +} + +int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy) +{ + return nfs4_init_cp_state(nn, ©->cp_stateid, NFS4_COPY_STID); +} + +struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn, + struct nfs4_stid *p_stid) +{ + struct nfs4_cpntf_state *cps; + + cps = kzalloc_obj(struct nfs4_cpntf_state); + if (!cps) + return NULL; + cps->cpntf_time = ktime_get_boottime_seconds(); + refcount_set(&cps->cp_stateid.cs_count, 1); + if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID)) + goto out_free; + spin_lock(&nn->s2s_cp_lock); + list_add(&cps->cp_list, &p_stid->sc_cp_list); + spin_unlock(&nn->s2s_cp_lock); + return cps; +out_free: + kfree(cps); + return NULL; +} + +void nfs4_free_copy_state(struct nfsd4_copy *copy) +{ + struct nfsd_net *nn; + + if (copy->cp_stateid.cs_type != NFS4_COPY_STID) + return; + nn = net_generic(copy->cp_clp->net, nfsd_net_id); + spin_lock(&nn->s2s_cp_lock); + idr_remove(&nn->s2s_cp_stateids, + copy->cp_stateid.cs_stid.si_opaque.so_id); + spin_unlock(&nn->s2s_cp_lock); +} + +static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid) +{ + struct nfs4_cpntf_state *cps; + struct nfsd_net *nn; + + nn = net_generic(net, nfsd_net_id); + spin_lock(&nn->s2s_cp_lock); + while (!list_empty(&stid->sc_cp_list)) { + cps = list_first_entry(&stid->sc_cp_list, + struct nfs4_cpntf_state, cp_list); + _free_cpntf_state_locked(nn, cps); + } + spin_unlock(&nn->s2s_cp_lock); +} + +static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp) +{ + struct nfs4_stid *stid; + + stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid); + if (!stid) + return NULL; + + return openlockstateid(stid); +} + +/* + * As the sc_free callback of deleg, this may be called by nfs4_put_stid + * in nfsd_break_one_deleg. + * Considering nfsd_break_one_deleg is called with the flc->flc_lock held, + * this function mustn't ever sleep. + */ +static void nfs4_free_deleg(struct nfs4_stid *stid) +{ + struct nfs4_delegation *dp = delegstateid(stid); + + WARN_ON_ONCE(!list_empty(&stid->sc_cp_list)); + WARN_ON_ONCE(!list_empty(&dp->dl_perfile)); + WARN_ON_ONCE(!list_empty(&dp->dl_perclnt)); + WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru)); + kmem_cache_free(deleg_slab, stid); + atomic_long_dec(&num_delegations); +} + +/* + * When we recall a delegation, we should be careful not to hand it + * out again straight away. + * To ensure this we keep a pair of bloom filters ('new' and 'old') + * in which the filehandles of recalled delegations are "stored". + * If a filehandle appear in either filter, a delegation is blocked. + * When a delegation is recalled, the filehandle is stored in the "new" + * filter. + * Every 30 seconds we swap the filters and clear the "new" one, + * unless both are empty of course. This results in delegations for a + * given filehandle being blocked for between 30 and 60 seconds. + * + * Each filter is 256 bits. We hash the filehandle to 32bit and use the + * low 3 bytes as hash-table indices. + * + * 'blocked_delegations_lock', which is always taken in block_delegations(), + * is used to manage concurrent access. Testing does not need the lock + * except when swapping the two filters. + */ +static DEFINE_SPINLOCK(blocked_delegations_lock); +static struct bloom_pair { + int entries, old_entries; + time64_t swap_time; + int new; /* index into 'set' */ + DECLARE_BITMAP(set[2], 256); +} blocked_delegations; + +static int delegation_blocked(struct knfsd_fh *fh) +{ + u32 hash; + struct bloom_pair *bd = &blocked_delegations; + + if (bd->entries == 0) + return 0; + if (ktime_get_seconds() - bd->swap_time > 30) { + spin_lock(&blocked_delegations_lock); + if (ktime_get_seconds() - bd->swap_time > 30) { + bd->entries -= bd->old_entries; + bd->old_entries = bd->entries; + bd->new = 1-bd->new; + memset(bd->set[bd->new], 0, + sizeof(bd->set[0])); + bd->swap_time = ktime_get_seconds(); + } + spin_unlock(&blocked_delegations_lock); + } + hash = jhash(&fh->fh_raw, fh->fh_size, 0); + if (test_bit(hash&255, bd->set[0]) && + test_bit((hash>>8)&255, bd->set[0]) && + test_bit((hash>>16)&255, bd->set[0])) + return 1; + + if (test_bit(hash&255, bd->set[1]) && + test_bit((hash>>8)&255, bd->set[1]) && + test_bit((hash>>16)&255, bd->set[1])) + return 1; + + return 0; +} + +static void block_delegations(struct knfsd_fh *fh) +{ + u32 hash; + struct bloom_pair *bd = &blocked_delegations; + + hash = jhash(&fh->fh_raw, fh->fh_size, 0); + + spin_lock(&blocked_delegations_lock); + __set_bit(hash&255, bd->set[bd->new]); + __set_bit((hash>>8)&255, bd->set[bd->new]); + __set_bit((hash>>16)&255, bd->set[bd->new]); + if (bd->entries == 0) + bd->swap_time = ktime_get_seconds(); + bd->entries += 1; + spin_unlock(&blocked_delegations_lock); +} + +static struct nfs4_delegation * +alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp, + struct nfs4_clnt_odstate *odstate, u32 dl_type) +{ + struct nfs4_delegation *dp; + struct nfs4_stid *stid; + long n; + + dprintk("NFSD alloc_init_deleg\n"); + n = atomic_long_inc_return(&num_delegations); + if (n < 0 || n > max_delegations) + goto out_dec; + if (delegation_blocked(&fp->fi_fhandle)) + goto out_dec; + stid = nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg); + if (stid == NULL) + goto out_dec; + dp = delegstateid(stid); + + /* + * delegation seqid's are never incremented. The 4.1 special + * meaning of seqid 0 isn't meaningful, really, but let's avoid + * 0 anyway just for consistency and use 1: + */ + dp->dl_stid.sc_stateid.si_generation = 1; + INIT_LIST_HEAD(&dp->dl_perfile); + INIT_LIST_HEAD(&dp->dl_perclnt); + INIT_LIST_HEAD(&dp->dl_recall_lru); + dp->dl_clnt_odstate = odstate; + get_clnt_odstate(odstate); + dp->dl_type = dl_type; + dp->dl_retries = 1; + dp->dl_recalled = false; + nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client, + &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL); + nfsd4_init_cb(&dp->dl_cb_fattr.ncf_getattr, dp->dl_stid.sc_client, + &nfsd4_cb_getattr_ops, NFSPROC4_CLNT_CB_GETATTR); + dp->dl_cb_fattr.ncf_file_modified = false; + get_nfs4_file(fp); + dp->dl_stid.sc_file = fp; + return dp; +out_dec: + atomic_long_dec(&num_delegations); + return NULL; +} + +void +nfs4_put_stid(struct nfs4_stid *s) +{ + struct svc_export *exp = s->sc_export; + struct nfs4_file *fp = s->sc_file; + struct nfs4_client *clp = s->sc_client; + + might_lock(&clp->cl_lock); + + if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) { + wake_up_all(&close_wq); + return; + } + idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); + if (s->sc_status & SC_STATUS_ADMIN_REVOKED) + atomic_dec(&s->sc_client->cl_admin_revoked); + nfs4_free_cpntf_statelist(clp->net, s); + spin_unlock(&clp->cl_lock); + s->sc_free(s); + if (exp) + exp_put(exp); + if (fp) + put_nfs4_file(fp); +} + +void +nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid) +{ + stateid_t *src = &stid->sc_stateid; + + spin_lock(&stid->sc_lock); + if (unlikely(++src->si_generation == 0)) + src->si_generation = 1; + memcpy(dst, src, sizeof(*dst)); + spin_unlock(&stid->sc_lock); +} + +static void put_deleg_file(struct nfs4_file *fp) +{ + struct nfsd_file *rnf = NULL; + struct nfsd_file *nf = NULL; + + spin_lock(&fp->fi_lock); + if (--fp->fi_delegees == 0) { + swap(nf, fp->fi_deleg_file); + swap(rnf, fp->fi_rdeleg_file); + } + spin_unlock(&fp->fi_lock); + + if (nf) + nfsd_file_put(nf); + if (rnf) { + nfsd_file_put(rnf); + nfs4_file_put_access(fp, NFS4_SHARE_ACCESS_READ); + } +} + +static void nfsd4_finalize_deleg_timestamps(struct nfs4_delegation *dp, struct file *f) +{ + /* don't do anything if FMODE_NOCMTIME isn't set */ + if ((READ_ONCE(f->f_mode) & FMODE_NOCMTIME) == 0) + return; + + spin_lock(&f->f_lock); + f->f_mode &= ~FMODE_NOCMTIME; + spin_unlock(&f->f_lock); + + /* was it never written? */ + if (!dp->dl_written) + return; + + /* did it get a setattr for the timestamps at some point? */ + if (dp->dl_setattr) + return; + + /* Stamp everything to "now" */ + nfsd_update_cmtime_attr(f, ATTR_ATIME); +} + +static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp) +{ + struct nfs4_file *fp = dp->dl_stid.sc_file; + struct nfsd_file *nf = fp->fi_deleg_file; + + WARN_ON_ONCE(!fp->fi_delegees); + + nfsd4_finalize_deleg_timestamps(dp, nf->nf_file); + kernel_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp); + put_deleg_file(fp); +} + +static void destroy_unhashed_deleg(struct nfs4_delegation *dp) +{ + put_clnt_odstate(dp->dl_clnt_odstate); + nfs4_unlock_deleg_lease(dp); + nfs4_put_stid(&dp->dl_stid); +} + +/** + * nfs4_delegation_exists - Discover if this delegation already exists + * @clp: a pointer to the nfs4_client we're granting a delegation to + * @fp: a pointer to the nfs4_file we're granting a delegation on + * + * Return: + * On success: true iff an existing delegation is found + */ + +static bool +nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp) +{ + struct nfs4_delegation *searchdp = NULL; + struct nfs4_client *searchclp = NULL; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->deleg_lock); + lockdep_assert_held(&fp->fi_lock); + + list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) { + searchclp = searchdp->dl_stid.sc_client; + if (clp == searchclp) { + return true; + } + } + return false; +} + +/** + * hash_delegation_locked - Add a delegation to the appropriate lists + * @dp: a pointer to the nfs4_delegation we are adding. + * @fp: a pointer to the nfs4_file we're granting a delegation on + * + * Return: + * On success: NULL if the delegation was successfully hashed. + * + * On error: -EAGAIN if one was previously granted to this + * nfs4_client for this nfs4_file. Delegation is not hashed. + * + */ + +static int +hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp) +{ + struct nfs4_client *clp = dp->dl_stid.sc_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->deleg_lock); + lockdep_assert_held(&fp->fi_lock); + lockdep_assert_held(&clp->cl_lock); + + if (nfs4_delegation_exists(clp, fp)) + return -EAGAIN; + refcount_inc(&dp->dl_stid.sc_count); + dp->dl_stid.sc_type = SC_TYPE_DELEG; + list_add(&dp->dl_perfile, &fp->fi_delegations); + list_add(&dp->dl_perclnt, &clp->cl_delegations); + return 0; +} + +static bool delegation_hashed(struct nfs4_delegation *dp) +{ + return !(list_empty(&dp->dl_perfile)); +} + +static bool +unhash_delegation_locked(struct nfs4_delegation *dp, unsigned short statusmask) +{ + struct nfs4_file *fp = dp->dl_stid.sc_file; + struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net, + nfsd_net_id); + + lockdep_assert_held(&nn->deleg_lock); + + if (!delegation_hashed(dp)) + return false; + + if (statusmask == SC_STATUS_REVOKED && + dp->dl_stid.sc_client->cl_minorversion == 0) + statusmask = SC_STATUS_CLOSED; + dp->dl_stid.sc_status |= statusmask; + if (statusmask & SC_STATUS_ADMIN_REVOKED) + atomic_inc(&dp->dl_stid.sc_client->cl_admin_revoked); + + /* Ensure that deleg break won't try to requeue it */ + ++dp->dl_time; + spin_lock(&fp->fi_lock); + list_del_init(&dp->dl_perclnt); + list_del_init(&dp->dl_recall_lru); + list_del_init(&dp->dl_perfile); + spin_unlock(&fp->fi_lock); + return true; +} + +static void destroy_delegation(struct nfs4_delegation *dp) +{ + bool unhashed; + struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net, + nfsd_net_id); + + spin_lock(&nn->deleg_lock); + unhashed = unhash_delegation_locked(dp, SC_STATUS_CLOSED); + spin_unlock(&nn->deleg_lock); + if (unhashed) + destroy_unhashed_deleg(dp); +} + +/** + * revoke_delegation - perform nfs4 delegation structure cleanup + * @dp: pointer to the delegation + * + * This function assumes that it's called either from the administrative + * interface (nfsd4_revoke_states()) that's revoking a specific delegation + * stateid or it's called from a laundromat thread (nfsd4_landromat()) that + * determined that this specific state has expired and needs to be revoked + * (both mark state with the appropriate stid sc_status mode). It is also + * assumed that a reference was taken on the @dp state. This function + * consumes that reference. + * + * If this function finds that the @dp state is SC_STATUS_FREED it means + * that a FREE_STATEID operation for this stateid has been processed and + * we can proceed to removing it from recalled list. However, if @dp state + * isn't marked SC_STATUS_FREED, it means we need place it on the cl_revoked + * list and wait for the FREE_STATEID to arrive from the client. At the same + * time, we need to mark it as SC_STATUS_FREEABLE to indicate to the + * nfsd4_free_stateid() function that this stateid has already been added + * to the cl_revoked list and that nfsd4_free_stateid() is now responsible + * for removing it from the list. Inspection of where the delegation state + * in the revocation process is protected by the clp->cl_lock. + */ +static void revoke_delegation(struct nfs4_delegation *dp) +{ + struct nfs4_client *clp = dp->dl_stid.sc_client; + + WARN_ON(!list_empty(&dp->dl_recall_lru)); + WARN_ON_ONCE(dp->dl_stid.sc_client->cl_minorversion > 0 && + !(dp->dl_stid.sc_status & + (SC_STATUS_REVOKED | SC_STATUS_ADMIN_REVOKED))); + + trace_nfsd_stid_revoke(&dp->dl_stid); + + spin_lock(&clp->cl_lock); + if (dp->dl_stid.sc_status & SC_STATUS_FREED) { + list_del_init(&dp->dl_recall_lru); + goto out; + } + list_add(&dp->dl_recall_lru, &clp->cl_revoked); + dp->dl_stid.sc_status |= SC_STATUS_FREEABLE; +out: + spin_unlock(&clp->cl_lock); + destroy_unhashed_deleg(dp); +} + +/* + * SETCLIENTID state + */ + +static unsigned int clientid_hashval(u32 id) +{ + return id & CLIENT_HASH_MASK; +} + +static unsigned int clientstr_hashval(struct xdr_netobj name) +{ + return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK; +} + +/* + * A stateid that had a deny mode associated with it is being released + * or downgraded. Recalculate the deny mode on the file. + */ +static void +recalculate_deny_mode(struct nfs4_file *fp) +{ + struct nfs4_ol_stateid *stp; + u32 old_deny; + + spin_lock(&fp->fi_lock); + old_deny = fp->fi_share_deny; + fp->fi_share_deny = 0; + list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { + fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap); + if (fp->fi_share_deny == old_deny) + break; + } + spin_unlock(&fp->fi_lock); +} + +static void +reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp) +{ + int i; + bool change = false; + + for (i = 1; i < 4; i++) { + if ((i & deny) != i) { + change = true; + clear_deny(i, stp); + } + } + + /* Recalculate per-file deny mode if there was a change */ + if (change) + recalculate_deny_mode(stp->st_stid.sc_file); +} + +/* release all access and file references for a given stateid */ +static void +release_all_access(struct nfs4_ol_stateid *stp) +{ + int i; + struct nfs4_file *fp = stp->st_stid.sc_file; + + if (fp && stp->st_deny_bmap != 0) + recalculate_deny_mode(fp); + + for (i = 1; i < 4; i++) { + if (test_access(i, stp)) + nfs4_file_put_access(stp->st_stid.sc_file, i); + clear_access(i, stp); + } +} + +/** + * nfs4_replay_free_cache - release dynamically allocated replay buffer + * @rp: replay cache to reset + * + * If @rp->rp_buf points to a kmalloc'd buffer, free it and reset + * rp_buf to the inline rp_ibuf. Always zeroes rp_buflen. + */ +void nfs4_replay_free_cache(struct nfs4_replay *rp) +{ + if (rp->rp_buf != rp->rp_ibuf) + kfree(rp->rp_buf); + rp->rp_buf = rp->rp_ibuf; + rp->rp_buflen = 0; +} + +static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop) +{ + nfs4_replay_free_cache(&sop->so_replay); + kfree(sop->so_owner.data); + sop->so_ops->so_free(sop); +} + +static void nfs4_put_stateowner(struct nfs4_stateowner *sop) +{ + struct nfs4_client *clp = sop->so_client; + + might_lock(&clp->cl_lock); + + if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock)) + return; + sop->so_ops->so_unhash(sop); + spin_unlock(&clp->cl_lock); + nfs4_free_stateowner(sop); +} + +static bool +nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp) +{ + return list_empty(&stp->st_perfile); +} + +static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp) +{ + struct nfs4_file *fp = stp->st_stid.sc_file; + + lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock); + + if (list_empty(&stp->st_perfile)) + return false; + + spin_lock(&fp->fi_lock); + list_del_init(&stp->st_perfile); + spin_unlock(&fp->fi_lock); + list_del(&stp->st_perstateowner); + return true; +} + +static void nfs4_free_ol_stateid(struct nfs4_stid *stid) +{ + struct nfs4_ol_stateid *stp = openlockstateid(stid); + + put_clnt_odstate(stp->st_clnt_odstate); + release_all_access(stp); + if (stp->st_stateowner) + nfs4_put_stateowner(stp->st_stateowner); + if (!list_empty(&stid->sc_cp_list)) + nfs4_free_cpntf_statelist(stid->sc_client->net, stid); + kmem_cache_free(stateid_slab, stid); +} + +static void nfs4_free_lock_stateid(struct nfs4_stid *stid) +{ + struct nfs4_ol_stateid *stp = openlockstateid(stid); + struct nfs4_lockowner *lo = lockowner(stp->st_stateowner); + struct nfsd_file *nf; + + nf = find_any_file(stp->st_stid.sc_file); + if (nf) { + get_file(nf->nf_file); + filp_close(nf->nf_file, (fl_owner_t)lo); + nfsd_file_put(nf); + } + nfs4_free_ol_stateid(stid); +} + +/* + * Put the persistent reference to an already unhashed generic stateid, while + * holding the cl_lock. If it's the last reference, then put it onto the + * reaplist for later destruction. + */ +static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp, + struct list_head *reaplist) +{ + struct nfs4_stid *s = &stp->st_stid; + struct nfs4_client *clp = s->sc_client; + + lockdep_assert_held(&clp->cl_lock); + + WARN_ON_ONCE(!list_empty(&stp->st_locks)); + + if (!refcount_dec_and_test(&s->sc_count)) { + wake_up_all(&close_wq); + return; + } + + idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); + if (s->sc_status & SC_STATUS_ADMIN_REVOKED) + atomic_dec(&s->sc_client->cl_admin_revoked); + list_add(&stp->st_locks, reaplist); +} + +static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp) +{ + lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); + + if (!unhash_ol_stateid(stp)) + return false; + list_del_init(&stp->st_locks); + stp->st_stid.sc_status |= SC_STATUS_CLOSED; + return true; +} + +static void release_lock_stateid(struct nfs4_ol_stateid *stp) +{ + struct nfs4_client *clp = stp->st_stid.sc_client; + bool unhashed; + + spin_lock(&clp->cl_lock); + unhashed = unhash_lock_stateid(stp); + spin_unlock(&clp->cl_lock); + if (unhashed) + nfs4_put_stid(&stp->st_stid); +} + +static void unhash_lockowner_locked(struct nfs4_lockowner *lo) +{ + struct nfs4_client *clp = lo->lo_owner.so_client; + + lockdep_assert_held(&clp->cl_lock); + + list_del_init(&lo->lo_owner.so_strhash); +} + +/* + * Free a list of generic stateids that were collected earlier after being + * fully unhashed. + */ +static void +free_ol_stateid_reaplist(struct list_head *reaplist) +{ + struct nfs4_ol_stateid *stp; + struct nfs4_file *fp; + + might_sleep(); + + while (!list_empty(reaplist)) { + stp = list_first_entry(reaplist, struct nfs4_ol_stateid, + st_locks); + list_del(&stp->st_locks); + fp = stp->st_stid.sc_file; + stp->st_stid.sc_free(&stp->st_stid); + if (fp) + put_nfs4_file(fp); + } +} + +static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp, + struct list_head *reaplist) +{ + struct nfs4_ol_stateid *stp; + + lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock); + + while (!list_empty(&open_stp->st_locks)) { + stp = list_entry(open_stp->st_locks.next, + struct nfs4_ol_stateid, st_locks); + unhash_lock_stateid(stp); + put_ol_stateid_locked(stp, reaplist); + } +} + +static bool unhash_open_stateid(struct nfs4_ol_stateid *stp, + struct list_head *reaplist) +{ + lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); + + if (!unhash_ol_stateid(stp)) + return false; + release_open_stateid_locks(stp, reaplist); + return true; +} + +static void release_open_stateid(struct nfs4_ol_stateid *stp) +{ + LIST_HEAD(reaplist); + + spin_lock(&stp->st_stid.sc_client->cl_lock); + stp->st_stid.sc_status |= SC_STATUS_CLOSED; + if (unhash_open_stateid(stp, &reaplist)) + put_ol_stateid_locked(stp, &reaplist); + spin_unlock(&stp->st_stid.sc_client->cl_lock); + free_ol_stateid_reaplist(&reaplist); +} + +static bool nfs4_openowner_unhashed(struct nfs4_openowner *oo) +{ + lockdep_assert_held(&oo->oo_owner.so_client->cl_lock); + + return list_empty(&oo->oo_owner.so_strhash) && + list_empty(&oo->oo_perclient); +} + +static void unhash_openowner_locked(struct nfs4_openowner *oo) +{ + struct nfs4_client *clp = oo->oo_owner.so_client; + + lockdep_assert_held(&clp->cl_lock); + + list_del_init(&oo->oo_owner.so_strhash); + list_del_init(&oo->oo_perclient); +} + +static void release_last_closed_stateid(struct nfs4_openowner *oo) +{ + struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net, + nfsd_net_id); + struct nfs4_ol_stateid *s; + + spin_lock(&nn->client_lock); + s = oo->oo_last_closed_stid; + if (s) { + list_del_init(&oo->oo_close_lru); + oo->oo_last_closed_stid = NULL; + } + spin_unlock(&nn->client_lock); + if (s) + nfs4_put_stid(&s->st_stid); +} + +static void release_openowner(struct nfs4_openowner *oo) +{ + struct nfs4_ol_stateid *stp; + struct nfs4_client *clp = oo->oo_owner.so_client; + LIST_HEAD(reaplist); + + spin_lock(&clp->cl_lock); + unhash_openowner_locked(oo); + while (!list_empty(&oo->oo_owner.so_stateids)) { + stp = list_first_entry(&oo->oo_owner.so_stateids, + struct nfs4_ol_stateid, st_perstateowner); + if (unhash_open_stateid(stp, &reaplist)) + put_ol_stateid_locked(stp, &reaplist); + } + spin_unlock(&clp->cl_lock); + free_ol_stateid_reaplist(&reaplist); + release_last_closed_stateid(oo); + nfs4_put_stateowner(&oo->oo_owner); +} + +static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp, + struct super_block *sb, + unsigned int sc_types) +{ + unsigned long id = 0; + struct nfs4_stid *stid; + + spin_lock(&clp->cl_lock); + while ((stid = idr_get_next_ul(&clp->cl_stateids, &id)) != NULL) { + if ((stid->sc_type & sc_types) && + stid->sc_status == 0 && + stid->sc_file->fi_inode->i_sb == sb) { + refcount_inc(&stid->sc_count); + break; + } + id++; + } + spin_unlock(&clp->cl_lock); + return stid; +} + +/* + * Release the export reference an admin-revoked stateid holds, + * so the svc_export (and its vfsmount) is not pinned until the + * client issues FREE_STATEID. sc_export is no longer consulted + * once SC_STATUS_ADMIN_REVOKED is set. + */ +static void drop_stid_export(struct nfs4_client *clp, + struct nfs4_stid *stid) +{ + struct svc_export *exp; + + spin_lock(&clp->cl_lock); + exp = stid->sc_export; + stid->sc_export = NULL; + spin_unlock(&clp->cl_lock); + if (exp) + exp_put(exp); +} + +static void revoke_ol_stid(struct nfs4_client *clp, + struct nfs4_ol_stateid *stp) +{ + struct nfs4_stid *stid = &stp->st_stid; + + lockdep_assert_held(&stp->st_mutex); + spin_lock(&clp->cl_lock); + if (stid->sc_status == 0) { + stid->sc_status |= SC_STATUS_ADMIN_REVOKED; + atomic_inc(&clp->cl_admin_revoked); + spin_unlock(&clp->cl_lock); + if (stid->sc_type == SC_TYPE_LOCK) { + struct nfs4_lockowner *lo = + lockowner(stp->st_stateowner); + struct nfsd_file *nf; + + nf = find_any_file(stp->st_stid.sc_file); + if (nf) { + get_file(nf->nf_file); + filp_close(nf->nf_file, (fl_owner_t)lo); + nfsd_file_put(nf); + } + } + release_all_access(stp); + drop_stid_export(clp, stid); + } else + spin_unlock(&clp->cl_lock); +} + +static void revoke_one_stid(struct nfsd_net *nn, struct nfs4_client *clp, + struct nfs4_stid *stid) +{ + struct nfs4_ol_stateid *stp; + struct nfs4_delegation *dp; + + switch (stid->sc_type) { + case SC_TYPE_OPEN: + stp = openlockstateid(stid); + mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX); + revoke_ol_stid(clp, stp); + mutex_unlock(&stp->st_mutex); + break; + case SC_TYPE_LOCK: + stp = openlockstateid(stid); + mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX); + revoke_ol_stid(clp, stp); + mutex_unlock(&stp->st_mutex); + break; + case SC_TYPE_DELEG: + /* + * Extra reference guards against concurrent FREE_STATEID. + */ + refcount_inc(&stid->sc_count); + dp = delegstateid(stid); + spin_lock(&nn->deleg_lock); + if (!unhash_delegation_locked(dp, SC_STATUS_ADMIN_REVOKED)) + dp = NULL; + spin_unlock(&nn->deleg_lock); + if (dp) { + revoke_delegation(dp); + drop_stid_export(clp, stid); + } else + nfs4_put_stid(stid); + break; + case SC_TYPE_LAYOUT: + spin_lock(&clp->cl_lock); + if (stid->sc_status == 0) { + stid->sc_status |= SC_STATUS_ADMIN_REVOKED; + atomic_inc(&clp->cl_admin_revoked); + } + spin_unlock(&clp->cl_lock); + nfsd4_close_layout(layoutstateid(stid)); + drop_stid_export(clp, stid); + break; + } +} + +/** + * nfsd4_revoke_states - revoke all nfsv4 states associated with given filesystem + * @nn: used to identify instance of nfsd (there is one per net namespace) + * @sb: super_block used to identify target filesystem + * + * All nfs4 states (open, lock, delegation, layout) held by the server instance + * and associated with a file on the given filesystem will be revoked resulting + * in any files being closed and so all references from nfsd to the filesystem + * being released. Thus nfsd will no longer prevent the filesystem from being + * unmounted. + * + * The clients which own the states will subsequently being notified that the + * states have been "admin-revoked". + */ +void nfsd4_revoke_states(struct nfsd_net *nn, struct super_block *sb) +{ + unsigned int idhashval; + unsigned int sc_types; + + sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT; + + spin_lock(&nn->client_lock); + for (idhashval = 0; idhashval < CLIENT_HASH_SIZE; idhashval++) { + struct list_head *head = &nn->conf_id_hashtbl[idhashval]; + struct nfs4_client *clp; + retry: + list_for_each_entry(clp, head, cl_idhash) { + struct nfs4_stid *stid = find_one_sb_stid(clp, sb, + sc_types); + if (stid) { + spin_unlock(&nn->client_lock); + revoke_one_stid(nn, clp, stid); + nfs4_put_stid(stid); + spin_lock(&nn->client_lock); + if (clp->cl_minorversion == 0) + /* Allow cleanup after a lease period. + * store_release ensures cleanup will + * see any newly revoked states if it + * sees the time updated. + */ + nn->nfs40_last_revoke = + ktime_get_boottime_seconds(); + goto retry; + } + } + } + spin_unlock(&nn->client_lock); +} + +static struct nfs4_stid *find_one_export_stid(struct nfs4_client *clp, + const struct path *path, + unsigned int sc_types) +{ + unsigned long id = 0; + struct nfs4_stid *stid; + + spin_lock(&clp->cl_lock); + while ((stid = idr_get_next_ul(&clp->cl_stateids, &id)) != NULL) { + if ((stid->sc_type & sc_types) && + stid->sc_status == 0 && + stid->sc_export && + path_equal(&stid->sc_export->ex_path, path)) { + refcount_inc(&stid->sc_count); + break; + } + id++; + } + spin_unlock(&clp->cl_lock); + return stid; +} + +/** + * nfsd4_revoke_export_states - revoke nfsv4 states acquired through an export + * @nn: used to identify instance of nfsd (there is one per net namespace) + * @path: export path whose states should be revoked + * + * All nfs4 states (open, lock, delegation, layout) acquired through any + * export matching @path are revoked, regardless of which client holds + * them. Matching is by path identity (dentry + vfsmount), so multiple + * svc_export objects for the same path -- one per auth_domain -- are + * handled correctly. + * + * Userspace (exportfs -u) sends this after removing the last client + * for a path, enabling the underlying filesystem to be unmounted. + */ +void nfsd4_revoke_export_states(struct nfsd_net *nn, const struct path *path) +{ + unsigned int idhashval; + unsigned int sc_types; + + sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT; + + spin_lock(&nn->client_lock); + for (idhashval = 0; idhashval < CLIENT_HASH_SIZE; idhashval++) { + struct list_head *head = &nn->conf_id_hashtbl[idhashval]; + struct nfs4_client *clp; + retry: + list_for_each_entry(clp, head, cl_idhash) { + struct nfs4_stid *stid = find_one_export_stid( + clp, path, + sc_types); + if (stid) { + spin_unlock(&nn->client_lock); + revoke_one_stid(nn, clp, stid); + nfs4_put_stid(stid); + spin_lock(&nn->client_lock); + if (clp->cl_minorversion == 0) + nn->nfs40_last_revoke = + ktime_get_boottime_seconds(); + goto retry; + } + } + } + spin_unlock(&nn->client_lock); +} + +static inline int +hash_sessionid(struct nfs4_sessionid *sessionid) +{ + struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; + + return sid->sequence % SESSION_HASH_SIZE; +} + +#ifdef CONFIG_SUNRPC_DEBUG +static inline void +dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) +{ + u32 *ptr = (u32 *)(&sessionid->data[0]); + dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); +} +#else +static inline void +dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) +{ +} +#endif + +/* + * Bump the seqid on cstate->replay_owner, and clear replay_owner if it + * won't be used for replay. + */ +void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr) +{ + struct nfs4_stateowner *so = cstate->replay_owner; + + if (nfserr == nfserr_replay_me) + return; + + if (!seqid_mutating_err(ntohl(nfserr))) { + nfsd4_cstate_clear_replay(cstate); + return; + } + if (!so) + return; + if (so->so_is_open_owner) + release_last_closed_stateid(openowner(so)); + so->so_seqid++; + return; +} + +static void +gen_sessionid(struct nfsd4_session *ses) +{ + struct nfs4_client *clp = ses->se_client; + struct nfsd4_sessionid *sid; + + sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; + sid->clientid = clp->cl_clientid; + sid->sequence = current_sessionid++; + sid->reserved = 0; +} + +/* + * The protocol defines ca_maxresponssize_cached to include the size of + * the rpc header, but all we need to cache is the data starting after + * the end of the initial SEQUENCE operation--the rest we regenerate + * each time. Therefore we can advertise a ca_maxresponssize_cached + * value that is the number of bytes in our cache plus a few additional + * bytes. In order to stay on the safe side, and not promise more than + * we can cache, those additional bytes must be the minimum possible: 24 + * bytes of rpc header (xid through accept state, with AUTH_NULL + * verifier), 12 for the compound header (with zero-length tag), and 44 + * for the SEQUENCE op response: + */ +#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) + +static struct shrinker *nfsd_slot_shrinker; +static DEFINE_SPINLOCK(nfsd_session_list_lock); +static LIST_HEAD(nfsd_session_list); +/* The sum of "target_slots-1" on every session. The shrinker can push this + * down, though it can take a little while for the memory to actually + * be freed. The "-1" is because we can never free slot 0 while the + * session is active. + */ +static atomic_t nfsd_total_target_slots = ATOMIC_INIT(0); + +static void +free_session_slots(struct nfsd4_session *ses, int from) +{ + int i; + + if (from >= ses->se_fchannel.maxreqs) + return; + + for (i = from; i < ses->se_fchannel.maxreqs; i++) { + struct nfsd4_slot *slot = xa_load(&ses->se_slots, i); + + /* + * Save the seqid in case we reactivate this slot. + * This will never require a memory allocation so GFP + * flag is irrelevant + */ + xa_store(&ses->se_slots, i, xa_mk_value(slot->sl_seqid), 0); + free_svc_cred(&slot->sl_cred); + kfree(slot); + } + ses->se_fchannel.maxreqs = from; + if (ses->se_target_maxslots > from) { + int new_target = from ?: 1; + atomic_sub(ses->se_target_maxslots - new_target, &nfsd_total_target_slots); + ses->se_target_maxslots = new_target; + } +} + +/** + * reduce_session_slots - reduce the target max-slots of a session if possible + * @ses: The session to affect + * @dec: how much to decrease the target by + * + * This interface can be used by a shrinker to reduce the target max-slots + * for a session so that some slots can eventually be freed. + * It uses spin_trylock() as it may be called in a context where another + * spinlock is held that has a dependency on client_lock. As shrinkers are + * best-effort, skiping a session is client_lock is already held has no + * great coast + * + * Return value: + * The number of slots that the target was reduced by. + */ +static int +reduce_session_slots(struct nfsd4_session *ses, int dec) +{ + struct nfsd_net *nn = net_generic(ses->se_client->net, + nfsd_net_id); + int ret = 0; + + if (ses->se_target_maxslots <= 1) + return ret; + if (!spin_trylock(&nn->client_lock)) + return ret; + ret = min(dec, ses->se_target_maxslots-1); + ses->se_target_maxslots -= ret; + atomic_sub(ret, &nfsd_total_target_slots); + ses->se_slot_gen += 1; + if (ses->se_slot_gen == 0) { + int i; + ses->se_slot_gen = 1; + for (i = 0; i < ses->se_fchannel.maxreqs; i++) { + struct nfsd4_slot *slot = xa_load(&ses->se_slots, i); + slot->sl_generation = 0; + } + } + spin_unlock(&nn->client_lock); + return ret; +} + +static struct nfsd4_slot *nfsd4_alloc_slot(struct nfsd4_channel_attrs *fattrs, + int index, gfp_t gfp) +{ + struct nfsd4_slot *slot; + size_t size; + + /* + * The RPC and NFS session headers are never saved in + * the slot reply cache buffer. + */ + size = fattrs->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ ? + 0 : fattrs->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; + + slot = kzalloc_flex(*slot, sl_data, size, gfp); + if (!slot) + return NULL; + slot->sl_index = index; + return slot; +} + +static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs, + struct nfsd4_channel_attrs *battrs) +{ + int numslots = fattrs->maxreqs; + struct nfsd4_session *new; + struct nfsd4_slot *slot; + int i; + + new = kzalloc_obj(*new); + if (!new) + return NULL; + xa_init(&new->se_slots); + + slot = nfsd4_alloc_slot(fattrs, 0, GFP_KERNEL); + if (!slot || xa_is_err(xa_store(&new->se_slots, 0, slot, GFP_KERNEL))) + goto out_free; + + for (i = 1; i < numslots; i++) { + const gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; + slot = nfsd4_alloc_slot(fattrs, i, gfp); + if (!slot) + break; + if (xa_is_err(xa_store(&new->se_slots, i, slot, gfp))) { + kfree(slot); + break; + } + } + fattrs->maxreqs = i; + memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs)); + new->se_target_maxslots = i; + atomic_add(i - 1, &nfsd_total_target_slots); + new->se_cb_slot_avail = ~0U; + new->se_cb_highest_slot = min(battrs->maxreqs - 1, + NFSD_BC_SLOT_TABLE_SIZE - 1); + spin_lock_init(&new->se_lock); + return new; +out_free: + kfree(slot); + xa_destroy(&new->se_slots); + kfree(new); + return NULL; +} + +static void free_conn(struct nfsd4_conn *c) +{ + svc_xprt_put(c->cn_xprt); + kfree(c); +} + +static void nfsd4_conn_lost(struct svc_xpt_user *u) +{ + struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); + struct nfs4_client *clp = c->cn_session->se_client; + + trace_nfsd_cb_lost(clp); + + spin_lock(&clp->cl_lock); + if (!list_empty(&c->cn_persession)) { + list_del(&c->cn_persession); + free_conn(c); + } + nfsd4_probe_callback(clp); + spin_unlock(&clp->cl_lock); +} + +static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) +{ + struct nfsd4_conn *conn; + + conn = kmalloc_obj(struct nfsd4_conn); + if (!conn) + return NULL; + svc_xprt_get(rqstp->rq_xprt); + conn->cn_xprt = rqstp->rq_xprt; + conn->cn_flags = flags; + INIT_LIST_HEAD(&conn->cn_xpt_user.list); + return conn; +} + +static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) +{ + conn->cn_session = ses; + list_add(&conn->cn_persession, &ses->se_conns); +} + +static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) +{ + struct nfs4_client *clp = ses->se_client; + + spin_lock(&clp->cl_lock); + __nfsd4_hash_conn(conn, ses); + spin_unlock(&clp->cl_lock); +} + +static int nfsd4_register_conn(struct nfsd4_conn *conn) +{ + conn->cn_xpt_user.callback = nfsd4_conn_lost; + return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); +} + +static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses) +{ + int ret; + + nfsd4_hash_conn(conn, ses); + ret = nfsd4_register_conn(conn); + if (ret) + /* oops; xprt is already down: */ + nfsd4_conn_lost(&conn->cn_xpt_user); + /* We may have gained or lost a callback channel: */ + nfsd4_probe_callback_sync(ses->se_client); +} + +static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses) +{ + u32 dir = NFS4_CDFC4_FORE; + + if (cses->flags & SESSION4_BACK_CHAN) + dir |= NFS4_CDFC4_BACK; + return alloc_conn(rqstp, dir); +} + +/* must be called under client_lock */ +static void nfsd4_del_conns(struct nfsd4_session *s) +{ + struct nfs4_client *clp = s->se_client; + struct nfsd4_conn *c; + + spin_lock(&clp->cl_lock); + while (!list_empty(&s->se_conns)) { + c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); + list_del_init(&c->cn_persession); + spin_unlock(&clp->cl_lock); + + unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); + free_conn(c); + + spin_lock(&clp->cl_lock); + } + spin_unlock(&clp->cl_lock); +} + +static void __free_session(struct nfsd4_session *ses) +{ + free_session_slots(ses, 0); + xa_destroy(&ses->se_slots); + kfree(ses); +} + +static void free_session(struct nfsd4_session *ses) +{ + nfsd4_del_conns(ses); + __free_session(ses); +} + +static unsigned long +nfsd_slot_count(struct shrinker *s, struct shrink_control *sc) +{ + unsigned long cnt = atomic_read(&nfsd_total_target_slots); + + return cnt ? cnt : SHRINK_EMPTY; +} + +static unsigned long +nfsd_slot_scan(struct shrinker *s, struct shrink_control *sc) +{ + struct nfsd4_session *ses; + unsigned long scanned = 0; + unsigned long freed = 0; + + spin_lock(&nfsd_session_list_lock); + list_for_each_entry(ses, &nfsd_session_list, se_all_sessions) { + freed += reduce_session_slots(ses, 1); + scanned += 1; + if (scanned >= sc->nr_to_scan) { + /* Move starting point for next scan */ + list_move(&nfsd_session_list, &ses->se_all_sessions); + break; + } + } + spin_unlock(&nfsd_session_list_lock); + sc->nr_scanned = scanned; + return freed; +} + +static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses) +{ + int idx; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + new->se_client = clp; + gen_sessionid(new); + + INIT_LIST_HEAD(&new->se_conns); + + atomic_set(&new->se_ref, 0); + new->se_dead = false; + new->se_cb_prog = cses->callback_prog; + new->se_cb_sec = cses->cb_sec; + + for (idx = 0; idx < NFSD_BC_SLOT_TABLE_SIZE; ++idx) + new->se_cb_seq_nr[idx] = 1; + + idx = hash_sessionid(&new->se_sessionid); + list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]); + spin_lock(&clp->cl_lock); + list_add(&new->se_perclnt, &clp->cl_sessions); + spin_unlock(&clp->cl_lock); + + spin_lock(&nfsd_session_list_lock); + list_add_tail(&new->se_all_sessions, &nfsd_session_list); + spin_unlock(&nfsd_session_list_lock); + + { + struct sockaddr *sa = svc_addr(rqstp); + /* + * This is a little silly; with sessions there's no real + * use for the callback address. Use the peer address + * as a reasonable default for now, but consider fixing + * the rpc client not to require an address in the + * future: + */ + rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); + clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); + } +} + +/* caller must hold client_lock */ +static struct nfsd4_session * +__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net) +{ + struct nfsd4_session *elem; + int idx; + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + dump_sessionid(__func__, sessionid); + idx = hash_sessionid(sessionid); + /* Search in the appropriate list */ + list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) { + if (!memcmp(elem->se_sessionid.data, sessionid->data, + NFS4_MAX_SESSIONID_LEN)) { + return elem; + } + } + + dprintk("%s: session not found\n", __func__); + return NULL; +} + +static struct nfsd4_session * +find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net, + __be32 *ret) +{ + struct nfsd4_session *session; + __be32 status = nfserr_badsession; + + session = __find_in_sessionid_hashtbl(sessionid, net); + if (!session) + goto out; + status = nfsd4_get_session_locked(session); + if (status) + session = NULL; +out: + *ret = status; + return session; +} + +/* caller must hold client_lock */ +static void +unhash_session(struct nfsd4_session *ses) +{ + struct nfs4_client *clp = ses->se_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + list_del(&ses->se_hash); + spin_lock(&ses->se_client->cl_lock); + list_del(&ses->se_perclnt); + spin_unlock(&ses->se_client->cl_lock); + spin_lock(&nfsd_session_list_lock); + list_del(&ses->se_all_sessions); + spin_unlock(&nfsd_session_list_lock); +} + +/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ +static int +STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn) +{ + /* + * We're assuming the clid was not given out from a boot + * precisely 2^32 (about 136 years) before this one. That seems + * a safe assumption: + */ + if (clid->cl_boot == (u32)nn->boot_time) + return 0; + trace_nfsd_clid_stale(clid); + return 1; +} + +static struct nfs4_client *alloc_client(struct xdr_netobj name, + struct nfsd_net *nn) +{ + struct nfs4_client *clp; + int i; + + if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients && + atomic_read(&nn->nfsd_courtesy_clients) > 0) + mod_delayed_work(laundry_wq, &nn->laundromat_work, 0); + + clp = kmem_cache_zalloc(client_slab, GFP_KERNEL); + if (clp == NULL) + return NULL; + xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL); + if (clp->cl_name.data == NULL) + goto err_no_name; + clp->cl_ownerstr_hashtbl = kmalloc_objs(struct list_head, + OWNER_HASH_SIZE); + if (!clp->cl_ownerstr_hashtbl) + goto err_no_hashtbl; + clp->cl_callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0); + if (!clp->cl_callback_wq) + goto err_no_callback_wq; + + for (i = 0; i < OWNER_HASH_SIZE; i++) + INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]); + INIT_LIST_HEAD(&clp->cl_sessions); + idr_init(&clp->cl_stateids); + atomic_set(&clp->cl_rpc_users, 0); + clp->cl_cb_state = NFSD4_CB_UNKNOWN; + clp->cl_state = NFSD4_ACTIVE; + atomic_inc(&nn->nfs4_client_count); + atomic_set(&clp->cl_delegs_in_recall, 0); + INIT_LIST_HEAD(&clp->cl_idhash); + INIT_LIST_HEAD(&clp->cl_openowners); + INIT_LIST_HEAD(&clp->cl_delegations); + INIT_LIST_HEAD(&clp->cl_lru); + INIT_LIST_HEAD(&clp->cl_revoked); +#ifdef CONFIG_NFSD_PNFS + INIT_LIST_HEAD(&clp->cl_lo_states); +#endif +#ifdef CONFIG_NFSD_SCSILAYOUT + xa_init(&clp->cl_dev_fences); + mutex_init(&clp->cl_fence_mutex); +#endif + INIT_LIST_HEAD(&clp->async_copies); + spin_lock_init(&clp->async_lock); + spin_lock_init(&clp->cl_lock); + rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); + return clp; +err_no_callback_wq: + kfree(clp->cl_ownerstr_hashtbl); +err_no_hashtbl: + kfree(clp->cl_name.data); +err_no_name: + kmem_cache_free(client_slab, clp); + return NULL; +} + +static void __free_client(struct kref *k) +{ + struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref); + struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs); + + free_svc_cred(&clp->cl_cred); + destroy_workqueue(clp->cl_callback_wq); + kfree(clp->cl_ownerstr_hashtbl); + kfree(clp->cl_name.data); + kfree(clp->cl_nii_domain.data); + kfree(clp->cl_nii_name.data); + idr_destroy(&clp->cl_stateids); + kfree(clp->cl_ra); + kmem_cache_free(client_slab, clp); +} + +/** + * nfsd4_put_client - release a reference on an nfs4_client + * @clp: the client to be released + * + * When the last reference is released, the client is freed. + */ +void nfsd4_put_client(struct nfs4_client *clp) +{ + kref_put(&clp->cl_nfsdfs.cl_ref, __free_client); +} + +static void +free_client(struct nfs4_client *clp) +{ + while (!list_empty(&clp->cl_sessions)) { + struct nfsd4_session *ses; + ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, + se_perclnt); + list_del(&ses->se_perclnt); + WARN_ON_ONCE(atomic_read(&ses->se_ref)); + free_session(ses); + } + rpc_destroy_wait_queue(&clp->cl_cb_waitq); + if (clp->cl_nfsd_dentry) { + nfsd_client_rmdir(clp->cl_nfsd_dentry); + clp->cl_nfsd_dentry = NULL; + wake_up_all(&expiry_wq); + } + nfsd4_put_client(clp); +} + +/* must be called under the client_lock */ +static void +unhash_client_locked(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + struct nfsd4_session *ses; + + lockdep_assert_held(&nn->client_lock); + + /* Mark the client as expired! */ + clp->cl_time = 0; + /* Make it invisible */ + if (!list_empty(&clp->cl_idhash)) { + list_del_init(&clp->cl_idhash); + if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags)) + rb_erase(&clp->cl_namenode, &nn->conf_name_tree); + else + rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); + } + list_del_init(&clp->cl_lru); + spin_lock(&clp->cl_lock); + spin_lock(&nfsd_session_list_lock); + list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) { + list_del_init(&ses->se_hash); + list_del_init(&ses->se_all_sessions); + } + spin_unlock(&nfsd_session_list_lock); + spin_unlock(&clp->cl_lock); +} + +static void +unhash_client(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + spin_lock(&nn->client_lock); + unhash_client_locked(clp); + spin_unlock(&nn->client_lock); +} + +static __be32 mark_client_expired_locked(struct nfs4_client *clp) +{ + int users = atomic_read(&clp->cl_rpc_users); + + trace_nfsd_mark_client_expired(clp, users); + + if (users) + return nfserr_jukebox; + unhash_client_locked(clp); + return nfs_ok; +} + +static void +__destroy_client(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + int i; + struct nfs4_openowner *oo; + struct nfs4_delegation *dp; + LIST_HEAD(reaplist); + + spin_lock(&nn->deleg_lock); + while (!list_empty(&clp->cl_delegations)) { + dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); + unhash_delegation_locked(dp, SC_STATUS_CLOSED); + list_add(&dp->dl_recall_lru, &reaplist); + } + spin_unlock(&nn->deleg_lock); + while (!list_empty(&reaplist)) { + dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); + list_del_init(&dp->dl_recall_lru); + destroy_unhashed_deleg(dp); + } + while (!list_empty(&clp->cl_revoked)) { + dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru); + list_del_init(&dp->dl_recall_lru); + nfs4_put_stid(&dp->dl_stid); + } + while (!list_empty(&clp->cl_openowners)) { + oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient); + nfs4_get_stateowner(&oo->oo_owner); + release_openowner(oo); + } + for (i = 0; i < OWNER_HASH_SIZE; i++) { + struct nfs4_stateowner *so, *tmp; + + list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i], + so_strhash) { + /* Should be no openowners at this point */ + WARN_ON_ONCE(so->so_is_open_owner); + remove_blocked_locks(lockowner(so)); + } + } + nfsd4_return_all_client_layouts(clp); + nfsd4_shutdown_copy(clp); + nfsd4_shutdown_callback(clp); + if (clp->cl_cb_conn.cb_xprt) + svc_xprt_put(clp->cl_cb_conn.cb_xprt); + atomic_add_unless(&nn->nfs4_client_count, -1, 0); + nfsd4_dec_courtesy_client_count(nn, clp); +#ifdef CONFIG_NFSD_SCSILAYOUT + xa_destroy(&clp->cl_dev_fences); +#endif + free_client(clp); + wake_up_all(&expiry_wq); +} + +static void +destroy_client(struct nfs4_client *clp) +{ + unhash_client(clp); + __destroy_client(clp); +} + +static void inc_reclaim_complete(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + if (!nn->track_reclaim_completes) + return; + if (!nfsd4_find_reclaim_client(clp->cl_name, nn)) + return; + if (atomic_inc_return(&nn->nr_reclaim_complete) == + nn->reclaim_str_hashtbl_size) { + printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n", + clp->net->ns.inum); + nfsd4_end_grace(nn); + } +} + +static void expire_client(struct nfs4_client *clp) +{ + unhash_client(clp); + nfsd4_client_record_remove(clp); + __destroy_client(clp); +} + +static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) +{ + memcpy(target->cl_verifier.data, source->data, + sizeof(target->cl_verifier.data)); +} + +static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) +{ + target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; + target->cl_clientid.cl_id = source->cl_clientid.cl_id; +} + +static int copy_cred(struct svc_cred *target, struct svc_cred *source) +{ + target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL); + target->cr_raw_principal = kstrdup(source->cr_raw_principal, + GFP_KERNEL); + target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL); + if ((source->cr_principal && !target->cr_principal) || + (source->cr_raw_principal && !target->cr_raw_principal) || + (source->cr_targ_princ && !target->cr_targ_princ)) + return -ENOMEM; + + target->cr_flavor = source->cr_flavor; + target->cr_uid = source->cr_uid; + target->cr_gid = source->cr_gid; + target->cr_group_info = source->cr_group_info; + get_group_info(target->cr_group_info); + target->cr_gss_mech = source->cr_gss_mech; + if (source->cr_gss_mech) + gss_mech_get(source->cr_gss_mech); + return 0; +} + +static int +compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2) +{ + if (o1->len < o2->len) + return -1; + if (o1->len > o2->len) + return 1; + return memcmp(o1->data, o2->data, o1->len); +} + +static int +same_verf(nfs4_verifier *v1, nfs4_verifier *v2) +{ + return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); +} + +static int +same_clid(clientid_t *cl1, clientid_t *cl2) +{ + return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); +} + +static bool groups_equal(struct group_info *g1, struct group_info *g2) +{ + int i; + + if (g1->ngroups != g2->ngroups) + return false; + for (i=0; i<g1->ngroups; i++) + if (!gid_eq(g1->gid[i], g2->gid[i])) + return false; + return true; +} + +/* + * RFC 3530 language requires clid_inuse be returned when the + * "principal" associated with a requests differs from that previously + * used. We use uid, gid's, and gss principal string as our best + * approximation. We also don't want to allow non-gss use of a client + * established using gss: in theory cr_principal should catch that + * change, but in practice cr_principal can be null even in the gss case + * since gssd doesn't always pass down a principal string. + */ +static bool is_gss_cred(struct svc_cred *cr) +{ + /* Is cr_flavor one of the gss "pseudoflavors"?: */ + return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR); +} + + +static bool +same_creds(struct svc_cred *cr1, struct svc_cred *cr2) +{ + if ((is_gss_cred(cr1) != is_gss_cred(cr2)) + || (!uid_eq(cr1->cr_uid, cr2->cr_uid)) + || (!gid_eq(cr1->cr_gid, cr2->cr_gid)) + || !groups_equal(cr1->cr_group_info, cr2->cr_group_info)) + return false; + /* XXX: check that cr_targ_princ fields match ? */ + if (cr1->cr_principal == cr2->cr_principal) + return true; + if (!cr1->cr_principal || !cr2->cr_principal) + return false; + return 0 == strcmp(cr1->cr_principal, cr2->cr_principal); +} + +static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp) +{ + struct svc_cred *cr = &rqstp->rq_cred; + u32 service; + + if (!cr->cr_gss_mech) + return false; + service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor); + return service == RPC_GSS_SVC_INTEGRITY || + service == RPC_GSS_SVC_PRIVACY; +} + +bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp) +{ + struct svc_cred *cr = &rqstp->rq_cred; + + if (!cl->cl_mach_cred) + return true; + if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech) + return false; + if (!svc_rqst_integrity_protected(rqstp)) + return false; + if (cl->cl_cred.cr_raw_principal) + return 0 == strcmp(cl->cl_cred.cr_raw_principal, + cr->cr_raw_principal); + if (!cr->cr_principal) + return false; + return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal); +} + +static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn) +{ + __be32 verf[2]; + + /* + * This is opaque to client, so no need to byte-swap. Use + * __force to keep sparse happy + */ + verf[0] = (__force __be32)(u32)ktime_get_real_seconds(); + verf[1] = (__force __be32)nn->clverifier_counter++; + memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data)); +} + +static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn) +{ + clp->cl_clientid.cl_boot = (u32)nn->boot_time; + clp->cl_clientid.cl_id = nn->clientid_counter++; + gen_confirm(clp, nn); +} + +static struct nfs4_stid * +find_stateid_locked(struct nfs4_client *cl, stateid_t *t) +{ + struct nfs4_stid *ret; + + ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id); + if (!ret || !ret->sc_type) + return NULL; + return ret; +} + +static struct nfs4_stid * +find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, + unsigned short typemask, unsigned short ok_states) +{ + struct nfs4_stid *s; + + spin_lock(&cl->cl_lock); + s = find_stateid_locked(cl, t); + if (s != NULL) { + if ((s->sc_status & ~ok_states) == 0 && + (typemask & s->sc_type)) + refcount_inc(&s->sc_count); + else + s = NULL; + } + spin_unlock(&cl->cl_lock); + return s; +} + +static struct nfs4_client *get_nfsdfs_clp(struct inode *inode) +{ + struct nfsdfs_client *nc; + nc = get_nfsdfs_client(inode); + if (!nc) + return NULL; + return container_of(nc, struct nfs4_client, cl_nfsdfs); +} + +static void seq_quote_mem(struct seq_file *m, char *data, int len) +{ + seq_puts(m, "\""); + seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\"); + seq_puts(m, "\""); +} + +static const char *cb_state2str(int state) +{ + switch (state) { + case NFSD4_CB_UP: + return "UP"; + case NFSD4_CB_UNKNOWN: + return "UNKNOWN"; + case NFSD4_CB_DOWN: + return "DOWN"; + case NFSD4_CB_FAULT: + return "FAULT"; + } + return "UNDEFINED"; +} + +static int client_info_show(struct seq_file *m, void *v) +{ + struct inode *inode = file_inode(m->file); + struct nfsd4_session *ses; + struct nfs4_client *clp; + u64 clid; + + clp = get_nfsdfs_clp(inode); + if (!clp) + return -ENXIO; + memcpy(&clid, &clp->cl_clientid, sizeof(clid)); + seq_printf(m, "clientid: 0x%llx\n", clid); + seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr); + + if (clp->cl_state == NFSD4_COURTESY) + seq_puts(m, "status: courtesy\n"); + else if (clp->cl_state == NFSD4_EXPIRABLE) + seq_puts(m, "status: expirable\n"); + else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags)) + seq_puts(m, "status: confirmed\n"); + else + seq_puts(m, "status: unconfirmed\n"); + seq_printf(m, "seconds from last renew: %lld\n", + ktime_get_boottime_seconds() - clp->cl_time); + seq_puts(m, "name: "); + seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len); + seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion); + if (clp->cl_nii_domain.data) { + seq_puts(m, "Implementation domain: "); + seq_quote_mem(m, clp->cl_nii_domain.data, + clp->cl_nii_domain.len); + seq_puts(m, "\nImplementation name: "); + seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len); + seq_printf(m, "\nImplementation time: [%lld, %ld]\n", + clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec); + } + seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state)); + seq_printf(m, "callback address: \"%pISpc\"\n", &clp->cl_cb_conn.cb_addr); + seq_printf(m, "admin-revoked states: %d\n", + atomic_read(&clp->cl_admin_revoked)); + spin_lock(&clp->cl_lock); + seq_printf(m, "session slots:"); + list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) + seq_printf(m, " %u", ses->se_fchannel.maxreqs); + seq_printf(m, "\nsession target slots:"); + list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) + seq_printf(m, " %u", ses->se_target_maxslots); + spin_unlock(&clp->cl_lock); + seq_puts(m, "\n"); + + nfsd4_put_client(clp); + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(client_info); + +static void *states_start(struct seq_file *s, loff_t *pos) + __acquires(&clp->cl_lock) +{ + struct nfs4_client *clp = s->private; + unsigned long id = *pos; + void *ret; + + spin_lock(&clp->cl_lock); + ret = idr_get_next_ul(&clp->cl_stateids, &id); + *pos = id; + return ret; +} + +static void *states_next(struct seq_file *s, void *v, loff_t *pos) +{ + struct nfs4_client *clp = s->private; + unsigned long id = *pos; + void *ret; + + id = *pos; + id++; + ret = idr_get_next_ul(&clp->cl_stateids, &id); + *pos = id; + return ret; +} + +static void states_stop(struct seq_file *s, void *v) + __releases(&clp->cl_lock) +{ + struct nfs4_client *clp = s->private; + + spin_unlock(&clp->cl_lock); +} + +static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f) +{ + seq_printf(s, "filename: \"%pD2\"", f->nf_file); +} + +static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f) +{ + struct inode *inode = file_inode(f->nf_file); + + seq_printf(s, "superblock: \"%02x:%02x:%llu\"", + MAJOR(inode->i_sb->s_dev), + MINOR(inode->i_sb->s_dev), + inode->i_ino); +} + +static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo) +{ + seq_puts(s, "owner: "); + seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len); +} + +static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid) +{ + seq_printf(s, "0x%.8x", stid->si_generation); + seq_printf(s, "%12phN", &stid->si_opaque); +} + +static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st) +{ + struct nfs4_ol_stateid *ols; + struct nfs4_file *nf; + struct nfsd_file *file; + struct nfs4_stateowner *oo; + unsigned int access, deny; + + ols = openlockstateid(st); + oo = ols->st_stateowner; + nf = st->sc_file; + + seq_puts(s, "- "); + nfs4_show_stateid(s, &st->sc_stateid); + seq_puts(s, ": { type: open, "); + + access = bmap_to_share_mode(ols->st_access_bmap); + deny = bmap_to_share_mode(ols->st_deny_bmap); + + seq_printf(s, "access: %s%s, ", + access & NFS4_SHARE_ACCESS_READ ? "r" : "-", + access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-"); + seq_printf(s, "deny: %s%s, ", + deny & NFS4_SHARE_ACCESS_READ ? "r" : "-", + deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-"); + + if (nf) { + spin_lock(&nf->fi_lock); + file = find_any_file_locked(nf); + if (file) { + nfs4_show_superblock(s, file); + seq_puts(s, ", "); + nfs4_show_fname(s, file); + seq_puts(s, ", "); + } + spin_unlock(&nf->fi_lock); + } else + seq_puts(s, "closed, "); + nfs4_show_owner(s, oo); + if (st->sc_status & SC_STATUS_ADMIN_REVOKED) + seq_puts(s, ", admin-revoked"); + seq_puts(s, " }\n"); + return 0; +} + +static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st) +{ + struct nfs4_ol_stateid *ols; + struct nfs4_file *nf; + struct nfsd_file *file; + struct nfs4_stateowner *oo; + + ols = openlockstateid(st); + oo = ols->st_stateowner; + nf = st->sc_file; + + seq_puts(s, "- "); + nfs4_show_stateid(s, &st->sc_stateid); + seq_puts(s, ": { type: lock, "); + + spin_lock(&nf->fi_lock); + file = find_any_file_locked(nf); + if (file) { + /* + * Note: a lock stateid isn't really the same thing as a lock, + * it's the locking state held by one owner on a file, and there + * may be multiple (or no) lock ranges associated with it. + * (Same for the matter is true of open stateids.) + */ + + nfs4_show_superblock(s, file); + /* XXX: open stateid? */ + seq_puts(s, ", "); + nfs4_show_fname(s, file); + seq_puts(s, ", "); + } + nfs4_show_owner(s, oo); + if (st->sc_status & SC_STATUS_ADMIN_REVOKED) + seq_puts(s, ", admin-revoked"); + seq_puts(s, " }\n"); + spin_unlock(&nf->fi_lock); + return 0; +} + +static char *nfs4_show_deleg_type(u32 dl_type) +{ + switch (dl_type) { + case OPEN_DELEGATE_READ: + return "r"; + case OPEN_DELEGATE_WRITE: + return "w"; + case OPEN_DELEGATE_READ_ATTRS_DELEG: + return "ra"; + case OPEN_DELEGATE_WRITE_ATTRS_DELEG: + return "wa"; + } + return "?"; +} + +static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st) +{ + struct nfs4_delegation *ds; + struct nfs4_file *nf; + struct nfsd_file *file; + + ds = delegstateid(st); + nf = st->sc_file; + + seq_puts(s, "- "); + nfs4_show_stateid(s, &st->sc_stateid); + seq_puts(s, ": { type: deleg, "); + + seq_printf(s, "access: %s", nfs4_show_deleg_type(ds->dl_type)); + + /* XXX: lease time, whether it's being recalled. */ + + spin_lock(&nf->fi_lock); + file = nf->fi_deleg_file; + if (file) { + seq_puts(s, ", "); + nfs4_show_superblock(s, file); + seq_puts(s, ", "); + nfs4_show_fname(s, file); + } + spin_unlock(&nf->fi_lock); + if (st->sc_status & SC_STATUS_ADMIN_REVOKED) + seq_puts(s, ", admin-revoked"); + seq_puts(s, " }\n"); + return 0; +} + +static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st) +{ + struct nfs4_layout_stateid *ls; + struct nfsd_file *file; + + ls = container_of(st, struct nfs4_layout_stateid, ls_stid); + + seq_puts(s, "- "); + nfs4_show_stateid(s, &st->sc_stateid); + seq_puts(s, ": { type: layout"); + + /* XXX: What else would be useful? */ + + spin_lock(&ls->ls_stid.sc_file->fi_lock); + file = ls->ls_file; + if (file) { + seq_puts(s, ", "); + nfs4_show_superblock(s, file); + seq_puts(s, ", "); + nfs4_show_fname(s, file); + } + spin_unlock(&ls->ls_stid.sc_file->fi_lock); + if (st->sc_status & SC_STATUS_ADMIN_REVOKED) + seq_puts(s, ", admin-revoked"); + seq_puts(s, " }\n"); + + return 0; +} + +static int states_show(struct seq_file *s, void *v) +{ + struct nfs4_stid *st = v; + + switch (st->sc_type) { + case SC_TYPE_OPEN: + return nfs4_show_open(s, st); + case SC_TYPE_LOCK: + return nfs4_show_lock(s, st); + case SC_TYPE_DELEG: + return nfs4_show_deleg(s, st); + case SC_TYPE_LAYOUT: + return nfs4_show_layout(s, st); + default: + return 0; /* XXX: or SEQ_SKIP? */ + } + /* XXX: copy stateids? */ +} + +static struct seq_operations states_seq_ops = { + .start = states_start, + .next = states_next, + .stop = states_stop, + .show = states_show +}; + +static int client_states_open(struct inode *inode, struct file *file) +{ + struct seq_file *s; + struct nfs4_client *clp; + int ret; + + clp = get_nfsdfs_clp(inode); + if (!clp) + return -ENXIO; + + ret = seq_open(file, &states_seq_ops); + if (ret) { + nfsd4_put_client(clp); + return ret; + } + s = file->private_data; + s->private = clp; + return 0; +} + +static int client_opens_release(struct inode *inode, struct file *file) +{ + struct seq_file *m = file->private_data; + struct nfs4_client *clp = m->private; + + /* XXX: alternatively, we could get/drop in seq start/stop */ + nfsd4_put_client(clp); + return seq_release(inode, file); +} + +static const struct file_operations client_states_fops = { + .open = client_states_open, + .read = seq_read, + .llseek = seq_lseek, + .release = client_opens_release, +}; + +/* + * Normally we refuse to destroy clients that are in use, but here the + * administrator is telling us to just do it. We also want to wait + * so the caller has a guarantee that the client's locks are gone by + * the time the write returns: + */ +static void force_expire_client(struct nfs4_client *clp) +{ + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + bool already_expired; + + trace_nfsd_clid_admin_expired(&clp->cl_clientid); + + spin_lock(&nn->client_lock); + clp->cl_time = 0; + spin_unlock(&nn->client_lock); + + wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0); + spin_lock(&nn->client_lock); + already_expired = list_empty(&clp->cl_lru); + if (!already_expired) + unhash_client_locked(clp); + spin_unlock(&nn->client_lock); + + if (!already_expired) + expire_client(clp); + else + wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL); +} + +static ssize_t client_ctl_write(struct file *file, const char __user *buf, + size_t size, loff_t *pos) +{ + char *data; + struct nfs4_client *clp; + + data = simple_transaction_get(file, buf, size); + if (IS_ERR(data)) + return PTR_ERR(data); + if (size != 7 || 0 != memcmp(data, "expire\n", 7)) + return -EINVAL; + clp = get_nfsdfs_clp(file_inode(file)); + if (!clp) + return -ENXIO; + force_expire_client(clp); + nfsd4_put_client(clp); + return 7; +} + +static const struct file_operations client_ctl_fops = { + .write = client_ctl_write, + .release = simple_transaction_release, +}; + +static const struct tree_descr client_files[] = { + [0] = {"info", &client_info_fops, S_IRUSR}, + [1] = {"states", &client_states_fops, S_IRUSR}, + [2] = {"ctl", &client_ctl_fops, S_IWUSR}, + [3] = {""}, +}; + +static int +nfsd4_cb_recall_any_done(struct nfsd4_callback *cb, + struct rpc_task *task) +{ + trace_nfsd_cb_recall_any_done(cb, task); + switch (task->tk_status) { + case -NFS4ERR_DELAY: + rpc_delay(task, 2 * HZ); + return 0; + default: + return 1; + } +} + +static void +nfsd4_cb_recall_any_release(struct nfsd4_callback *cb) +{ + struct nfs4_client *clp = cb->cb_clp; + + nfsd4_put_client(clp); +} + +static int +nfsd4_cb_getattr_done(struct nfsd4_callback *cb, struct rpc_task *task) +{ + struct nfs4_cb_fattr *ncf = + container_of(cb, struct nfs4_cb_fattr, ncf_getattr); + struct nfs4_delegation *dp = + container_of(ncf, struct nfs4_delegation, dl_cb_fattr); + + trace_nfsd_cb_getattr_done(&dp->dl_stid.sc_stateid, task); + ncf->ncf_cb_status = task->tk_status; + switch (task->tk_status) { + case -NFS4ERR_DELAY: + rpc_delay(task, 2 * HZ); + return 0; + default: + return 1; + } +} + +static void +nfsd4_cb_getattr_release(struct nfsd4_callback *cb) +{ + struct nfs4_cb_fattr *ncf = + container_of(cb, struct nfs4_cb_fattr, ncf_getattr); + struct nfs4_delegation *dp = + container_of(ncf, struct nfs4_delegation, dl_cb_fattr); + + nfs4_put_stid(&dp->dl_stid); +} + +static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = { + .done = nfsd4_cb_recall_any_done, + .release = nfsd4_cb_recall_any_release, + .opcode = OP_CB_RECALL_ANY, +}; + +static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops = { + .done = nfsd4_cb_getattr_done, + .release = nfsd4_cb_getattr_release, + .opcode = OP_CB_GETATTR, +}; + +static void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf) +{ + struct nfs4_delegation *dp = + container_of(ncf, struct nfs4_delegation, dl_cb_fattr); + + if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &ncf->ncf_getattr.cb_flags)) + return; + + /* set to proper status when nfsd4_cb_getattr_done runs */ + ncf->ncf_cb_status = NFS4ERR_IO; + + /* ensure that wake_bit is done when RUNNING is cleared */ + set_bit(NFSD4_CALLBACK_WAKE, &ncf->ncf_getattr.cb_flags); + + refcount_inc(&dp->dl_stid.sc_count); + nfsd4_run_cb(&ncf->ncf_getattr); +} + +static struct nfs4_client *create_client(struct xdr_netobj name, + struct svc_rqst *rqstp, nfs4_verifier *verf) +{ + struct nfs4_client *clp; + struct sockaddr *sa = svc_addr(rqstp); + int ret; + struct net *net = SVC_NET(rqstp); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + struct dentry *dentries[ARRAY_SIZE(client_files)]; + + clp = alloc_client(name, nn); + if (clp == NULL) + return NULL; + + ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred); + if (ret) { + free_client(clp); + return NULL; + } + gen_clid(clp, nn); + kref_init(&clp->cl_nfsdfs.cl_ref); + nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL); + clp->cl_time = ktime_get_boottime_seconds(); + copy_verf(clp, verf); + memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage)); + clp->cl_cb_session = NULL; + clp->net = net; + clp->cl_nfsd_dentry = nfsd_client_mkdir( + nn, &clp->cl_nfsdfs, + clp->cl_clientid.cl_id - nn->clientid_base, + client_files, dentries); + clp->cl_nfsd_info_dentry = dentries[0]; + if (!clp->cl_nfsd_dentry) { + free_client(clp); + return NULL; + } + clp->cl_ra = kzalloc_obj(*clp->cl_ra); + if (!clp->cl_ra) { + free_client(clp); + return NULL; + } + clp->cl_ra_time = 0; + nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops, + NFSPROC4_CLNT_CB_RECALL_ANY); + return clp; +} + +static void +add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root) +{ + struct rb_node **new = &(root->rb_node), *parent = NULL; + struct nfs4_client *clp; + + while (*new) { + clp = rb_entry(*new, struct nfs4_client, cl_namenode); + parent = *new; + + if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0) + new = &((*new)->rb_left); + else + new = &((*new)->rb_right); + } + + rb_link_node(&new_clp->cl_namenode, parent, new); + rb_insert_color(&new_clp->cl_namenode, root); +} + +static struct nfs4_client * +find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root) +{ + int cmp; + struct rb_node *node = root->rb_node; + struct nfs4_client *clp; + + while (node) { + clp = rb_entry(node, struct nfs4_client, cl_namenode); + cmp = compare_blob(&clp->cl_name, name); + if (cmp > 0) + node = node->rb_left; + else if (cmp < 0) + node = node->rb_right; + else + return clp; + } + return NULL; +} + +static void +add_to_unconfirmed(struct nfs4_client *clp) +{ + unsigned int idhashval; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); + add_clp_to_name_tree(clp, &nn->unconf_name_tree); + idhashval = clientid_hashval(clp->cl_clientid.cl_id); + list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]); + renew_client_locked(clp); +} + +static void +move_to_confirmed(struct nfs4_client *clp) +{ + unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + + list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]); + rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); + add_clp_to_name_tree(clp, &nn->conf_name_tree); + set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); + trace_nfsd_clid_confirmed(&clp->cl_clientid); + renew_client_locked(clp); +} + +static struct nfs4_client * +find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions) +{ + struct nfs4_client *clp; + unsigned int idhashval = clientid_hashval(clid->cl_id); + + list_for_each_entry(clp, &tbl[idhashval], cl_idhash) { + if (same_clid(&clp->cl_clientid, clid)) { + if ((bool)clp->cl_minorversion != sessions) + return NULL; + renew_client_locked(clp); + return clp; + } + } + return NULL; +} + +static struct nfs4_client * +find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) +{ + struct list_head *tbl = nn->conf_id_hashtbl; + + lockdep_assert_held(&nn->client_lock); + return find_client_in_id_table(tbl, clid, sessions); +} + +static struct nfs4_client * +find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) +{ + struct list_head *tbl = nn->unconf_id_hashtbl; + + lockdep_assert_held(&nn->client_lock); + return find_client_in_id_table(tbl, clid, sessions); +} + +static bool clp_used_exchangeid(struct nfs4_client *clp) +{ + return clp->cl_exchange_flags != 0; +} + +static struct nfs4_client * +find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) +{ + lockdep_assert_held(&nn->client_lock); + return find_clp_in_name_tree(name, &nn->conf_name_tree); +} + +static struct nfs4_client * +find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) +{ + lockdep_assert_held(&nn->client_lock); + return find_clp_in_name_tree(name, &nn->unconf_name_tree); +} + +static void +gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp) +{ + struct nfs4_cb_conn *conn = &clp->cl_cb_conn; + struct sockaddr *sa = svc_addr(rqstp); + u32 scopeid = rpc_get_scope_id(sa); + unsigned short expected_family; + + /* Currently, we only support tcp and tcp6 for the callback channel */ + if (se->se_callback_netid_len == 3 && + !memcmp(se->se_callback_netid_val, "tcp", 3)) + expected_family = AF_INET; + else if (se->se_callback_netid_len == 4 && + !memcmp(se->se_callback_netid_val, "tcp6", 4)) + expected_family = AF_INET6; + else + goto out_err; + + conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val, + se->se_callback_addr_len, + (struct sockaddr *)&conn->cb_addr, + sizeof(conn->cb_addr)); + + if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) + goto out_err; + + if (conn->cb_addr.ss_family == AF_INET6) + ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; + + conn->cb_prog = se->se_callback_prog; + conn->cb_ident = se->se_callback_ident; + memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen); + trace_nfsd_cb_args(clp, conn); + return; +out_err: + conn->cb_addr.ss_family = AF_UNSPEC; + conn->cb_addrlen = 0; + trace_nfsd_cb_nodelegs(clp); + return; +} + +/* + * Cache a reply. nfsd4_check_resp_size() has bounded the cache size. + */ +static void +nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) +{ + struct xdr_buf *buf = resp->xdr->buf; + struct nfsd4_slot *slot = resp->cstate.slot; + unsigned int base; + + /* + * RFC 5661 Section 2.10.6.1.2: + * + * Any time SEQUENCE ... returns an error ... [t]he replier MUST NOT + * modify the reply cache entry for the slot whenever an error is + * returned from SEQUENCE ... + * + * Because nfsd4_store_cache_entry is called only by + * nfsd4_sequence_done(), nfsd4_store_cache_entry() is called only + * when a SEQUENCE operation was part of the COMPOUND. + * nfs41_check_op_ordering() ensures SEQUENCE is the first op. + */ + if (resp->opcnt == 1 && resp->cstate.status != nfs_ok) + return; + + slot->sl_flags |= NFSD4_SLOT_INITIALIZED; + slot->sl_opcnt = resp->opcnt; + slot->sl_status = resp->cstate.status; + free_svc_cred(&slot->sl_cred); + copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred); + + if (!(resp->cstate.slot->sl_flags & NFSD4_SLOT_CACHETHIS)) { + slot->sl_flags &= ~NFSD4_SLOT_CACHED; + return; + } + slot->sl_flags |= NFSD4_SLOT_CACHED; + + base = resp->cstate.data_offset; + slot->sl_datalen = buf->len - base; + if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen)) + WARN(1, "%s: sessions DRC could not cache compound\n", + __func__); + return; +} + +/* + * The sequence operation is not cached because we can use the slot and + * session values. + */ +static __be32 +nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, + struct nfsd4_sequence *seq) +{ + struct nfsd4_compoundargs *args = resp->rqstp->rq_argp; + struct nfsd4_slot *slot = resp->cstate.slot; + struct xdr_stream *xdr = resp->xdr; + __be32 *p; + + dprintk("--> %s slot %p\n", __func__, slot); + + /* Always encode the SEQUENCE response. */ + nfsd4_encode_operation(resp, &args->ops[0]); + if (args->opcnt == 1) + /* A solo SEQUENCE - nothing was cached */ + return args->ops[0].status; + + if (!(slot->sl_flags & NFSD4_SLOT_CACHED)) { + /* We weren't asked to cache this. */ + struct nfsd4_op *op; + + op = &args->ops[resp->opcnt++]; + op->status = nfserr_retry_uncached_rep; + nfsd4_encode_operation(resp, op); + return op->status; + } + + /* return reply from cache */ + p = xdr_reserve_space(xdr, slot->sl_datalen); + if (!p) { + WARN_ON_ONCE(1); + return nfserr_serverfault; + } + xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen); + xdr_commit_encode(xdr); + + resp->opcnt = slot->sl_opcnt; + return slot->sl_status; +} + +/* + * Set the exchange_id flags returned by the server. + */ +static void +nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) +{ +#ifdef CONFIG_NFSD_PNFS + new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS; +#else + new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; +#endif + + /* Referrals are supported, Migration is not. */ + new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; + + /* set the wire flags to return to client. */ + clid->flags = new->cl_exchange_flags; +} + +static bool client_has_openowners(struct nfs4_client *clp) +{ + struct nfs4_openowner *oo; + + list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) { + if (!list_empty(&oo->oo_owner.so_stateids)) + return true; + } + return false; +} + +static bool client_has_state(struct nfs4_client *clp) +{ + return client_has_openowners(clp) +#ifdef CONFIG_NFSD_PNFS + || !list_empty(&clp->cl_lo_states) +#endif + || !list_empty(&clp->cl_delegations) + || !list_empty(&clp->cl_sessions) + || nfsd4_has_active_async_copies(clp); +} + +static __be32 copy_impl_id(struct nfs4_client *clp, + struct nfsd4_exchange_id *exid) +{ + if (!exid->nii_domain.data) + return 0; + xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL); + if (!clp->cl_nii_domain.data) + return nfserr_jukebox; + xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL); + if (!clp->cl_nii_name.data) + return nfserr_jukebox; + clp->cl_nii_time = exid->nii_time; + return 0; +} + +__be32 +nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_exchange_id *exid = &u->exchange_id; + struct nfs4_client *conf, *new; + struct nfs4_client *unconf = NULL; + __be32 status; + char addr_str[INET6_ADDRSTRLEN]; + nfs4_verifier verf = exid->verifier; + struct sockaddr *sa = svc_addr(rqstp); + bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + rpc_ntop(sa, addr_str, sizeof(addr_str)); + dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " + "ip_addr=%s flags %x, spa_how %u\n", + __func__, rqstp, exid, exid->clname.len, exid->clname.data, + addr_str, exid->flags, exid->spa_how); + + exid->server_impl_name = kasprintf(GFP_KERNEL, "%s %s %s %s", + utsname()->sysname, utsname()->release, + utsname()->version, utsname()->machine); + if (!exid->server_impl_name) + return nfserr_jukebox; + + if (exid->flags & ~EXCHGID4_FLAG_MASK_A) + return nfserr_inval; + + new = create_client(exid->clname, rqstp, &verf); + if (new == NULL) + return nfserr_jukebox; + status = copy_impl_id(new, exid); + if (status) + goto out_nolock; + + switch (exid->spa_how) { + case SP4_MACH_CRED: + exid->spo_must_enforce[0] = 0; + exid->spo_must_enforce[1] = ( + 1 << (OP_BIND_CONN_TO_SESSION - 32) | + 1 << (OP_EXCHANGE_ID - 32) | + 1 << (OP_CREATE_SESSION - 32) | + 1 << (OP_DESTROY_SESSION - 32) | + 1 << (OP_DESTROY_CLIENTID - 32)); + + exid->spo_must_allow[0] &= (1 << (OP_CLOSE) | + 1 << (OP_OPEN_DOWNGRADE) | + 1 << (OP_LOCKU) | + 1 << (OP_DELEGRETURN)); + + exid->spo_must_allow[1] &= ( + 1 << (OP_TEST_STATEID - 32) | + 1 << (OP_FREE_STATEID - 32)); + if (!svc_rqst_integrity_protected(rqstp)) { + status = nfserr_inval; + goto out_nolock; + } + /* + * Sometimes userspace doesn't give us a principal. + * Which is a bug, really. Anyway, we can't enforce + * MACH_CRED in that case, better to give up now: + */ + if (!new->cl_cred.cr_principal && + !new->cl_cred.cr_raw_principal) { + status = nfserr_serverfault; + goto out_nolock; + } + new->cl_mach_cred = true; + break; + case SP4_NONE: + break; + default: /* checked by xdr code */ + WARN_ON_ONCE(1); + fallthrough; + case SP4_SSV: + status = nfserr_encr_alg_unsupp; + goto out_nolock; + } + + /* Cases below refer to rfc 5661 section 18.35.4: */ + spin_lock(&nn->client_lock); + conf = find_confirmed_client_by_name(&exid->clname, nn); + if (conf) { + bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred); + bool verfs_match = same_verf(&verf, &conf->cl_verifier); + + if (update) { + if (!clp_used_exchangeid(conf)) { /* buggy client */ + status = nfserr_inval; + goto out; + } + if (!nfsd4_mach_creds_match(conf, rqstp)) { + status = nfserr_wrong_cred; + goto out; + } + if (!creds_match) { /* case 9 */ + status = nfserr_perm; + goto out; + } + if (!verfs_match) { /* case 8 */ + status = nfserr_not_same; + goto out; + } + /* case 6 */ + exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; + trace_nfsd_clid_confirmed_r(conf); + goto out_copy; + } + if (!creds_match) { /* case 3 */ + if (client_has_state(conf)) { + status = nfserr_clid_inuse; + trace_nfsd_clid_cred_mismatch(conf, rqstp); + goto out; + } + goto out_new; + } + if (verfs_match) { /* case 2 */ + conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; + trace_nfsd_clid_confirmed_r(conf); + goto out_copy; + } + /* case 5, client reboot */ + trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf); + conf = NULL; + goto out_new; + } + + if (update) { /* case 7 */ + status = nfserr_noent; + goto out; + } + + unconf = find_unconfirmed_client_by_name(&exid->clname, nn); + if (unconf) /* case 4, possible retry or client restart */ + unhash_client_locked(unconf); + + /* case 1, new owner ID */ + trace_nfsd_clid_fresh(new); + +out_new: + if (conf) { + status = mark_client_expired_locked(conf); + if (status) + goto out; + trace_nfsd_clid_replaced(&conf->cl_clientid); + } + new->cl_minorversion = cstate->minorversion; + new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0]; + new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1]; + + /* Contrived initial CREATE_SESSION response */ + new->cl_cs_slot.sl_status = nfserr_seq_misordered; + + add_to_unconfirmed(new); + swap(new, conf); +out_copy: + exid->clientid.cl_boot = conf->cl_clientid.cl_boot; + exid->clientid.cl_id = conf->cl_clientid.cl_id; + + exid->seqid = conf->cl_cs_slot.sl_seqid + 1; + nfsd4_set_ex_flags(conf, exid); + + exid->nii_domain.len = sizeof("kernel.org") - 1; + exid->nii_domain.data = "kernel.org"; + + /* + * Note that RFC 8881 places no length limit on + * nii_name, but this implementation permits no + * more than NFS4_OPAQUE_LIMIT bytes. + */ + exid->nii_name.len = strlen(exid->server_impl_name); + if (exid->nii_name.len > NFS4_OPAQUE_LIMIT) + exid->nii_name.len = NFS4_OPAQUE_LIMIT; + exid->nii_name.data = exid->server_impl_name; + + /* just send zeros - the date is in nii_name */ + exid->nii_time.tv_sec = 0; + exid->nii_time.tv_nsec = 0; + + dprintk("nfsd4_exchange_id seqid %d flags %x\n", + conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags); + status = nfs_ok; + +out: + spin_unlock(&nn->client_lock); +out_nolock: + if (new) + expire_client(new); + if (unconf) { + trace_nfsd_clid_expire_unconf(&unconf->cl_clientid); + expire_client(unconf); + } + return status; +} + +void +nfsd4_exchange_id_release(union nfsd4_op_u *u) +{ + struct nfsd4_exchange_id *exid = &u->exchange_id; + + kfree(exid->server_impl_name); +} + +static __be32 check_slot_seqid(u32 seqid, u32 slot_seqid, u8 flags) +{ + /* The slot is in use, and no response has been sent. */ + if (flags & NFSD4_SLOT_INUSE) { + if (seqid == slot_seqid) + return nfserr_jukebox; + else + return nfserr_seq_misordered; + } + /* Note unsigned 32-bit arithmetic handles wraparound: */ + if (likely(seqid == slot_seqid + 1)) + return nfs_ok; + if ((flags & NFSD4_SLOT_REUSED) && seqid == 1) + return nfs_ok; + if (seqid == slot_seqid) + return nfserr_replay_cache; + return nfserr_seq_misordered; +} + +/* + * Cache the create session result into the create session single DRC + * slot cache by saving the xdr structure. sl_seqid has been set. + * Do this for solo or embedded create session operations. + */ +static void +nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, + struct nfsd4_clid_slot *slot, __be32 nfserr) +{ + slot->sl_status = nfserr; + memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); +} + +static __be32 +nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, + struct nfsd4_clid_slot *slot) +{ + memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); + return slot->sl_status; +} + +#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\ + 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \ + 1 + /* MIN tag is length with zero, only length */ \ + 3 + /* version, opcount, opcode */ \ + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ + /* seqid, slotID, slotID, cache */ \ + 4 ) * sizeof(__be32)) + +#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\ + 2 + /* verifier: AUTH_NULL, length 0 */\ + 1 + /* status */ \ + 1 + /* MIN tag is length with zero, only length */ \ + 3 + /* opcount, opcode, opstatus*/ \ + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ + /* seqid, slotID, slotID, slotID, status */ \ + 5 ) * sizeof(__be32)) + +static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn) +{ + u32 maxrpc = nn->nfsd_serv->sv_max_mesg; + + if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ) + return nfserr_toosmall; + if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ) + return nfserr_toosmall; + ca->headerpadsz = 0; + ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc); + ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc); + ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND); + ca->maxresp_cached = min_t(u32, ca->maxresp_cached, + NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ); + ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION); + + return nfs_ok; +} + +/* + * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now. + * These are based on similar macros in linux/sunrpc/msg_prot.h . + */ +#define RPC_MAX_HEADER_WITH_AUTH_SYS \ + (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK)) + +#define RPC_MAX_REPHEADER_WITH_AUTH_SYS \ + (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK)) + +#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \ + RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32)) +#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \ + RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \ + sizeof(__be32)) + +static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca) +{ + ca->headerpadsz = 0; + + if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ) + return nfserr_toosmall; + if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ) + return nfserr_toosmall; + ca->maxresp_cached = 0; + if (ca->maxops < 2) + return nfserr_toosmall; + + return nfs_ok; +} + +static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs) +{ + switch (cbs->flavor) { + case RPC_AUTH_NULL: + case RPC_AUTH_UNIX: + return nfs_ok; + default: + /* + * GSS case: the spec doesn't allow us to return this + * error. But it also doesn't allow us not to support + * GSS. + * I'd rather this fail hard than return some error the + * client might think it can already handle: + */ + return nfserr_encr_alg_unsupp; + } +} + +__be32 +nfsd4_create_session(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) +{ + struct nfsd4_create_session *cr_ses = &u->create_session; + struct sockaddr *sa = svc_addr(rqstp); + struct nfs4_client *conf, *unconf; + struct nfsd4_clid_slot *cs_slot; + struct nfs4_client *old = NULL; + struct nfsd4_session *new; + struct nfsd4_conn *conn; + __be32 status = 0; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + if (cr_ses->flags & ~SESSION4_FLAG_MASK_A) + return nfserr_inval; + status = nfsd4_check_cb_sec(&cr_ses->cb_sec); + if (status) + return status; + status = check_forechannel_attrs(&cr_ses->fore_channel, nn); + if (status) + return status; + status = check_backchannel_attrs(&cr_ses->back_channel); + if (status) + goto out_err; + status = nfserr_jukebox; + new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel); + if (!new) + goto out_err; + conn = alloc_conn_from_crses(rqstp, cr_ses); + if (!conn) + goto out_free_session; + + spin_lock(&nn->client_lock); + + /* RFC 8881 Section 18.36.4 Phase 1: Client record look-up. */ + unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn); + conf = find_confirmed_client(&cr_ses->clientid, true, nn); + if (!conf && !unconf) { + status = nfserr_stale_clientid; + goto out_free_conn; + } + + /* RFC 8881 Section 18.36.4 Phase 2: Sequence ID processing. */ + if (conf) { + cs_slot = &conf->cl_cs_slot; + trace_nfsd_slot_seqid_conf(conf, cr_ses); + } else { + cs_slot = &unconf->cl_cs_slot; + trace_nfsd_slot_seqid_unconf(unconf, cr_ses); + } + status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); + switch (status) { + case nfs_ok: + cs_slot->sl_seqid++; + cr_ses->seqid = cs_slot->sl_seqid; + break; + case nfserr_replay_cache: + status = nfsd4_replay_create_session(cr_ses, cs_slot); + fallthrough; + case nfserr_jukebox: + /* The server MUST NOT cache NFS4ERR_DELAY */ + goto out_free_conn; + default: + goto out_cache_error; + } + + /* RFC 8881 Section 18.36.4 Phase 3: Client ID confirmation. */ + if (conf) { + status = nfserr_wrong_cred; + if (!nfsd4_mach_creds_match(conf, rqstp)) + goto out_cache_error; + } else { + status = nfserr_clid_inuse; + if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || + !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { + trace_nfsd_clid_cred_mismatch(unconf, rqstp); + goto out_cache_error; + } + status = nfserr_wrong_cred; + if (!nfsd4_mach_creds_match(unconf, rqstp)) + goto out_cache_error; + old = find_confirmed_client_by_name(&unconf->cl_name, nn); + if (old) { + status = mark_client_expired_locked(old); + if (status) + goto out_expired_error; + trace_nfsd_clid_replaced(&old->cl_clientid); + } + move_to_confirmed(unconf); + conf = unconf; + } + + /* RFC 8881 Section 18.36.4 Phase 4: Session creation. */ + status = nfs_ok; + /* Persistent sessions are not supported */ + cr_ses->flags &= ~SESSION4_PERSIST; + /* Upshifting from TCP to RDMA is not supported */ + cr_ses->flags &= ~SESSION4_RDMA; + /* Report the correct number of backchannel slots */ + cr_ses->back_channel.maxreqs = new->se_cb_highest_slot + 1; + + init_session(rqstp, new, conf, cr_ses); + nfsd4_get_session_locked(new); + + memcpy(cr_ses->sessionid.data, new->se_sessionid.data, + NFS4_MAX_SESSIONID_LEN); + + /* cache solo and embedded create sessions under the client_lock */ + nfsd4_cache_create_session(cr_ses, cs_slot, status); + spin_unlock(&nn->client_lock); + if (conf == unconf) + fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY); + /* init connection and backchannel */ + nfsd4_init_conn(rqstp, conn, new); + nfsd4_put_session(new); + if (old) + expire_client(old); + return status; + +out_expired_error: + /* + * Revert the slot seq_nr change so the server will process + * the client's resend instead of returning a cached response. + */ + if (status == nfserr_jukebox) { + cs_slot->sl_seqid--; + cr_ses->seqid = cs_slot->sl_seqid; + goto out_free_conn; + } +out_cache_error: + nfsd4_cache_create_session(cr_ses, cs_slot, status); +out_free_conn: + spin_unlock(&nn->client_lock); + free_conn(conn); +out_free_session: + __free_session(new); +out_err: + return status; +} + +static __be32 nfsd4_map_bcts_dir(u32 *dir) +{ + switch (*dir) { + case NFS4_CDFC4_FORE: + case NFS4_CDFC4_BACK: + return nfs_ok; + case NFS4_CDFC4_FORE_OR_BOTH: + case NFS4_CDFC4_BACK_OR_BOTH: + *dir = NFS4_CDFC4_BOTH; + return nfs_ok; + } + return nfserr_inval; +} + +__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl; + struct nfsd4_session *session = cstate->session; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + __be32 status; + + status = nfsd4_check_cb_sec(&bc->bc_cb_sec); + if (status) + return status; + spin_lock(&nn->client_lock); + session->se_cb_prog = bc->bc_cb_program; + session->se_cb_sec = bc->bc_cb_sec; + spin_unlock(&nn->client_lock); + + nfsd4_probe_callback(session->se_client); + + return nfs_ok; +} + +static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) +{ + struct nfsd4_conn *c; + + list_for_each_entry(c, &s->se_conns, cn_persession) { + if (c->cn_xprt == xpt) { + return c; + } + } + return NULL; +} + +static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst, + struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn) +{ + struct nfs4_client *clp = session->se_client; + struct svc_xprt *xpt = rqst->rq_xprt; + struct nfsd4_conn *c; + __be32 status; + + /* Following the last paragraph of RFC 5661 Section 18.34.3: */ + spin_lock(&clp->cl_lock); + c = __nfsd4_find_conn(xpt, session); + if (!c) + status = nfserr_noent; + else if (req == c->cn_flags) + status = nfs_ok; + else if (req == NFS4_CDFC4_FORE_OR_BOTH && + c->cn_flags != NFS4_CDFC4_BACK) + status = nfs_ok; + else if (req == NFS4_CDFC4_BACK_OR_BOTH && + c->cn_flags != NFS4_CDFC4_FORE) + status = nfs_ok; + else + status = nfserr_inval; + spin_unlock(&clp->cl_lock); + if (status == nfs_ok && conn) + *conn = c; + return status; +} + +__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; + __be32 status; + struct nfsd4_conn *conn; + struct nfsd4_session *session; + struct net *net = SVC_NET(rqstp); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + if (!nfsd4_last_compound_op(rqstp)) + return nfserr_not_only_op; + spin_lock(&nn->client_lock); + session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status); + spin_unlock(&nn->client_lock); + if (!session) + goto out_no_session; + status = nfserr_wrong_cred; + if (!nfsd4_mach_creds_match(session->se_client, rqstp)) + goto out; + status = nfsd4_match_existing_connection(rqstp, session, + bcts->dir, &conn); + if (status == nfs_ok) { + if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH || + bcts->dir == NFS4_CDFC4_BACK) + conn->cn_flags |= NFS4_CDFC4_BACK; + nfsd4_probe_callback(session->se_client); + goto out; + } + if (status == nfserr_inval) + goto out; + status = nfsd4_map_bcts_dir(&bcts->dir); + if (status) + goto out; + conn = alloc_conn(rqstp, bcts->dir); + status = nfserr_jukebox; + if (!conn) + goto out; + nfsd4_init_conn(rqstp, conn, session); + status = nfs_ok; +out: + nfsd4_put_session(session); +out_no_session: + return status; +} + +static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid) +{ + if (!cstate->session) + return false; + return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid)); +} + +__be32 +nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid; + struct nfsd4_session *ses; + __be32 status; + int ref_held_by_me = 0; + struct net *net = SVC_NET(r); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + status = nfserr_not_only_op; + if (nfsd4_compound_in_session(cstate, sessionid)) { + if (!nfsd4_last_compound_op(r)) + goto out; + ref_held_by_me++; + } + dump_sessionid(__func__, sessionid); + spin_lock(&nn->client_lock); + ses = find_in_sessionid_hashtbl(sessionid, net, &status); + if (!ses) + goto out_client_lock; + status = nfserr_wrong_cred; + if (!nfsd4_mach_creds_match(ses->se_client, r)) + goto out_put_session; + status = mark_session_dead_locked(ses, 1 + ref_held_by_me); + if (status) + goto out_put_session; + unhash_session(ses); + spin_unlock(&nn->client_lock); + + nfsd4_probe_callback_sync(ses->se_client); + + spin_lock(&nn->client_lock); + status = nfs_ok; +out_put_session: + nfsd4_put_session_locked(ses); +out_client_lock: + spin_unlock(&nn->client_lock); +out: + return status; +} + +static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) +{ + struct nfs4_client *clp = ses->se_client; + struct nfsd4_conn *c; + __be32 status = nfs_ok; + int ret; + + spin_lock(&clp->cl_lock); + c = __nfsd4_find_conn(new->cn_xprt, ses); + if (c) + goto out_free; + status = nfserr_conn_not_bound_to_session; + if (clp->cl_mach_cred) + goto out_free; + __nfsd4_hash_conn(new, ses); + spin_unlock(&clp->cl_lock); + ret = nfsd4_register_conn(new); + if (ret) + /* oops; xprt is already down: */ + nfsd4_conn_lost(&new->cn_xpt_user); + return nfs_ok; +out_free: + spin_unlock(&clp->cl_lock); + free_conn(new); + return status; +} + +static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session) +{ + struct nfsd4_compoundargs *args = rqstp->rq_argp; + + return args->opcnt > session->se_fchannel.maxops; +} + +static bool nfsd4_request_too_big(struct svc_rqst *rqstp, + struct nfsd4_session *session) +{ + struct xdr_buf *xb = &rqstp->rq_arg; + + return xb->len > session->se_fchannel.maxreq_sz; +} + +static bool replay_matches_cache(struct svc_rqst *rqstp, + struct nfsd4_sequence *seq, struct nfsd4_slot *slot) +{ + struct nfsd4_compoundargs *argp = rqstp->rq_argp; + + if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) != + (bool)seq->cachethis) + return false; + /* + * If there's an error then the reply can have fewer ops than + * the call. + */ + if (slot->sl_opcnt < argp->opcnt && !slot->sl_status) + return false; + /* + * But if we cached a reply with *more* ops than the call you're + * sending us now, then this new call is clearly not really a + * replay of the old one: + */ + if (slot->sl_opcnt > argp->opcnt) + return false; + /* This is the only check explicitly called by spec: */ + if (!same_creds(&rqstp->rq_cred, &slot->sl_cred)) + return false; + /* + * There may be more comparisons we could actually do, but the + * spec doesn't require us to catch every case where the calls + * don't match (that would require caching the call as well as + * the reply), so we don't bother. + */ + return true; +} + +/* + * Note that the response is constructed here both for the case + * of a new SEQUENCE request and for a replayed SEQUENCE request. + * We do not cache SEQUENCE responses as SEQUENCE is idempotent. + */ +static void nfsd4_construct_sequence_response(struct nfsd4_session *session, + struct nfsd4_sequence *seq) +{ + struct nfs4_client *clp = session->se_client; + + seq->maxslots_response = max(session->se_target_maxslots, + seq->maxslots); + seq->target_maxslots = session->se_target_maxslots; + + switch (clp->cl_cb_state) { + case NFSD4_CB_DOWN: + seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN; + break; + case NFSD4_CB_FAULT: + seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT; + break; + default: + seq->status_flags = 0; + } + if (!list_empty(&clp->cl_revoked)) + seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED; + if (atomic_read(&clp->cl_admin_revoked)) + seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED; +} + +__be32 +nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_sequence *seq = &u->sequence; + struct nfsd4_compoundres *resp = rqstp->rq_resp; + struct xdr_stream *xdr = resp->xdr; + struct nfsd4_session *session; + struct nfs4_client *clp; + struct nfsd4_slot *slot; + struct nfsd4_conn *conn; + __be32 status; + int buflen; + struct net *net = SVC_NET(rqstp); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + if (resp->opcnt != 1) + return nfserr_sequence_pos; + + /* + * Will be either used or freed by nfsd4_sequence_check_conn + * below. + */ + conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); + if (!conn) + return nfserr_jukebox; + + spin_lock(&nn->client_lock); + session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status); + if (!session) + goto out_no_session; + clp = session->se_client; + + status = nfserr_too_many_ops; + if (nfsd4_session_too_many_ops(rqstp, session)) + goto out_put_session; + + status = nfserr_req_too_big; + if (nfsd4_request_too_big(rqstp, session)) + goto out_put_session; + + status = nfserr_badslot; + if (seq->slotid >= session->se_fchannel.maxreqs) + goto out_put_session; + + slot = xa_load(&session->se_slots, seq->slotid); + dprintk("%s: slotid %d\n", __func__, seq->slotid); + + trace_nfsd_slot_seqid_sequence(clp, seq, slot); + + nfsd4_construct_sequence_response(session, seq); + + status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_flags); + if (status == nfserr_replay_cache) { + status = nfserr_seq_misordered; + if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED)) + goto out_put_session; + status = nfserr_seq_false_retry; + if (!replay_matches_cache(rqstp, seq, slot)) + goto out_put_session; + cstate->slot = slot; + cstate->session = session; + cstate->clp = clp; + /* Return the cached reply status and set cstate->status + * for nfsd4_proc_compound processing */ + status = nfsd4_replay_cache_entry(resp, seq); + cstate->status = nfserr_replay_cache; + goto out; + } + if (status) + goto out_put_session; + + status = nfsd4_sequence_check_conn(conn, session); + conn = NULL; + if (status) + goto out_put_session; + + if (session->se_target_maxslots < session->se_fchannel.maxreqs && + slot->sl_generation == session->se_slot_gen && + seq->maxslots <= session->se_target_maxslots) + /* Client acknowledged our reduce maxreqs */ + free_session_slots(session, session->se_target_maxslots); + + buflen = (seq->cachethis) ? + session->se_fchannel.maxresp_cached : + session->se_fchannel.maxresp_sz; + status = (seq->cachethis) ? nfserr_rep_too_big_to_cache : + nfserr_rep_too_big; + if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack)) + goto out_put_session; + svc_reserve_auth(rqstp, buflen); + + status = nfs_ok; + /* Success! accept new slot seqid */ + slot->sl_seqid = seq->seqid; + slot->sl_flags &= ~NFSD4_SLOT_REUSED; + slot->sl_flags |= NFSD4_SLOT_INUSE; + slot->sl_generation = session->se_slot_gen; + if (seq->cachethis) + slot->sl_flags |= NFSD4_SLOT_CACHETHIS; + else + slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS; + + cstate->slot = slot; + cstate->session = session; + cstate->clp = clp; + + /* + * If the client ever uses the highest available slot, + * gently try to allocate another 20%. This allows + * fairly quick growth without grossly over-shooting what + * the client might use. + */ + if (seq->slotid == session->se_fchannel.maxreqs - 1 && + session->se_target_maxslots >= session->se_fchannel.maxreqs && + session->se_fchannel.maxreqs < NFSD_MAX_SLOTS_PER_SESSION) { + int s = session->se_fchannel.maxreqs; + int cnt = DIV_ROUND_UP(s, 5); + void *prev_slot; + + do { + /* + * GFP_NOWAIT both allows allocation under a + * spinlock, and only succeeds if there is + * plenty of memory. + */ + slot = nfsd4_alloc_slot(&session->se_fchannel, s, + GFP_NOWAIT); + prev_slot = xa_load(&session->se_slots, s); + if (xa_is_value(prev_slot) && slot) { + slot->sl_seqid = xa_to_value(prev_slot); + slot->sl_flags |= NFSD4_SLOT_REUSED; + } + if (slot && + !xa_is_err(xa_store(&session->se_slots, s, slot, + GFP_NOWAIT))) { + s += 1; + session->se_fchannel.maxreqs = s; + atomic_add(s - session->se_target_maxslots, + &nfsd_total_target_slots); + session->se_target_maxslots = s; + } else { + kfree(slot); + slot = NULL; + } + } while (slot && --cnt > 0); + } + +out: + trace_nfsd_seq4_status(rqstp, seq); +out_no_session: + if (conn) + free_conn(conn); + spin_unlock(&nn->client_lock); + return status; +out_put_session: + nfsd4_put_session_locked(session); + goto out_no_session; +} + +void +nfsd4_sequence_done(struct nfsd4_compoundres *resp) +{ + struct nfsd4_compound_state *cs = &resp->cstate; + + if (nfsd4_has_session(cs)) { + if (cs->status != nfserr_replay_cache) { + nfsd4_store_cache_entry(resp); + cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE; + } + /* Drop session reference that was taken in nfsd4_sequence() */ + nfsd4_put_session(cs->session); + } else if (cs->clp) + put_client_renew(cs->clp); +} + +__be32 +nfsd4_destroy_clientid(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_destroy_clientid *dc = &u->destroy_clientid; + struct nfs4_client *conf, *unconf; + struct nfs4_client *clp = NULL; + __be32 status = 0; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + spin_lock(&nn->client_lock); + unconf = find_unconfirmed_client(&dc->clientid, true, nn); + conf = find_confirmed_client(&dc->clientid, true, nn); + WARN_ON_ONCE(conf && unconf); + + if (conf) { + if (client_has_state(conf)) { + status = nfserr_clientid_busy; + goto out; + } + status = mark_client_expired_locked(conf); + if (status) + goto out; + clp = conf; + } else if (unconf) + clp = unconf; + else { + status = nfserr_stale_clientid; + goto out; + } + if (!nfsd4_mach_creds_match(clp, rqstp)) { + clp = NULL; + status = nfserr_wrong_cred; + goto out; + } + trace_nfsd_clid_destroyed(&clp->cl_clientid); + unhash_client_locked(clp); +out: + spin_unlock(&nn->client_lock); + if (clp) + expire_client(clp); + return status; +} + +__be32 +nfsd4_reclaim_complete(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) +{ + struct nfsd4_reclaim_complete *rc = &u->reclaim_complete; + struct nfs4_client *clp = cstate->clp; + __be32 status = 0; + + if (rc->rca_one_fs) { + if (!cstate->current_fh.fh_dentry) + return nfserr_nofilehandle; + /* + * We don't take advantage of the rca_one_fs case. + * That's OK, it's optional, we can safely ignore it. + */ + return nfs_ok; + } + + status = nfserr_complete_already; + if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags)) + goto out; + + status = nfserr_stale_clientid; + if (is_client_expired(clp)) + /* + * The following error isn't really legal. + * But we only get here if the client just explicitly + * destroyed the client. Surely it no longer cares what + * error it gets back on an operation for the dead + * client. + */ + goto out; + + status = nfs_ok; + trace_nfsd_clid_reclaim_complete(&clp->cl_clientid); + nfsd4_client_record_create(clp); + inc_reclaim_complete(clp); +out: + return status; +} + +__be32 +nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_setclientid *setclid = &u->setclientid; + struct xdr_netobj clname = setclid->se_name; + nfs4_verifier clverifier = setclid->se_verf; + struct nfs4_client *conf, *new; + struct nfs4_client *unconf = NULL; + __be32 status; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + new = create_client(clname, rqstp, &clverifier); + if (new == NULL) + return nfserr_jukebox; + spin_lock(&nn->client_lock); + conf = find_confirmed_client_by_name(&clname, nn); + if (conf && client_has_state(conf)) { + status = nfserr_clid_inuse; + if (clp_used_exchangeid(conf)) + goto out; + if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { + trace_nfsd_clid_cred_mismatch(conf, rqstp); + goto out; + } + } + unconf = find_unconfirmed_client_by_name(&clname, nn); + if (unconf) + unhash_client_locked(unconf); + if (conf) { + if (same_verf(&conf->cl_verifier, &clverifier)) { + copy_clid(new, conf); + gen_confirm(new, nn); + } else + trace_nfsd_clid_verf_mismatch(conf, rqstp, + &clverifier); + } else + trace_nfsd_clid_fresh(new); + new->cl_minorversion = 0; + gen_callback(new, setclid, rqstp); + add_to_unconfirmed(new); + setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; + setclid->se_clientid.cl_id = new->cl_clientid.cl_id; + memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); + new = NULL; + status = nfs_ok; +out: + spin_unlock(&nn->client_lock); + if (new) + free_client(new); + if (unconf) { + trace_nfsd_clid_expire_unconf(&unconf->cl_clientid); + expire_client(unconf); + } + return status; +} + +__be32 +nfsd4_setclientid_confirm(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_setclientid_confirm *setclientid_confirm = + &u->setclientid_confirm; + struct nfs4_client *conf, *unconf; + struct nfs4_client *old = NULL; + nfs4_verifier confirm = setclientid_confirm->sc_confirm; + clientid_t * clid = &setclientid_confirm->sc_clientid; + __be32 status; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + if (STALE_CLIENTID(clid, nn)) + return nfserr_stale_clientid; + + spin_lock(&nn->client_lock); + conf = find_confirmed_client(clid, false, nn); + unconf = find_unconfirmed_client(clid, false, nn); + /* + * We try hard to give out unique clientid's, so if we get an + * attempt to confirm the same clientid with a different cred, + * the client may be buggy; this should never happen. + * + * Nevertheless, RFC 7530 recommends INUSE for this case: + */ + status = nfserr_clid_inuse; + if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { + trace_nfsd_clid_cred_mismatch(unconf, rqstp); + goto out; + } + if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) { + trace_nfsd_clid_cred_mismatch(conf, rqstp); + goto out; + } + if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) { + if (conf && same_verf(&confirm, &conf->cl_confirm)) { + status = nfs_ok; + } else + status = nfserr_stale_clientid; + goto out; + } + status = nfs_ok; + if (conf) { + if (get_client_locked(conf) == nfs_ok) { + old = unconf; + unhash_client_locked(old); + nfsd4_change_callback(conf, &unconf->cl_cb_conn); + } else { + conf = NULL; + } + } + + if (!conf) { + old = find_confirmed_client_by_name(&unconf->cl_name, nn); + if (old) { + status = nfserr_clid_inuse; + if (client_has_state(old) + && !same_creds(&unconf->cl_cred, + &old->cl_cred)) { + old = NULL; + goto out; + } + status = mark_client_expired_locked(old); + if (status) { + old = NULL; + goto out; + } + trace_nfsd_clid_replaced(&old->cl_clientid); + } + status = get_client_locked(unconf); + if (status != nfs_ok) { + old = NULL; + goto out; + } + move_to_confirmed(unconf); + conf = unconf; + } + spin_unlock(&nn->client_lock); + if (conf == unconf) + fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY); + nfsd4_probe_callback(conf); + spin_lock(&nn->client_lock); + put_client_renew_locked(conf); +out: + spin_unlock(&nn->client_lock); + if (old) + expire_client(old); + return status; +} + +static struct nfs4_file *nfsd4_alloc_file(void) +{ + return kmem_cache_alloc(file_slab, GFP_KERNEL); +} + +/* OPEN Share state helper functions */ + +static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp) +{ + refcount_set(&fp->fi_ref, 1); + spin_lock_init(&fp->fi_lock); + INIT_LIST_HEAD(&fp->fi_stateids); + INIT_LIST_HEAD(&fp->fi_delegations); + INIT_LIST_HEAD(&fp->fi_clnt_odstate); + fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle); + fp->fi_deleg_file = NULL; + fp->fi_rdeleg_file = NULL; + fp->fi_had_conflict = false; + fp->fi_share_deny = 0; + memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); + memset(fp->fi_access, 0, sizeof(fp->fi_access)); + fp->fi_aliased = false; + fp->fi_inode = d_inode(fh->fh_dentry); +#ifdef CONFIG_NFSD_PNFS + INIT_LIST_HEAD(&fp->fi_lo_states); + atomic_set(&fp->fi_lo_recalls, 0); +#endif +} + +void +nfsd4_free_slabs(void) +{ + kmem_cache_destroy(client_slab); + kmem_cache_destroy(openowner_slab); + kmem_cache_destroy(lockowner_slab); + kmem_cache_destroy(file_slab); + kmem_cache_destroy(stateid_slab); + kmem_cache_destroy(deleg_slab); + kmem_cache_destroy(odstate_slab); +} + +int +nfsd4_init_slabs(void) +{ + client_slab = KMEM_CACHE(nfs4_client, 0); + if (client_slab == NULL) + goto out; + openowner_slab = KMEM_CACHE(nfs4_openowner, 0); + if (openowner_slab == NULL) + goto out_free_client_slab; + lockowner_slab = KMEM_CACHE(nfs4_lockowner, 0); + if (lockowner_slab == NULL) + goto out_free_openowner_slab; + file_slab = KMEM_CACHE(nfs4_file, 0); + if (file_slab == NULL) + goto out_free_lockowner_slab; + stateid_slab = KMEM_CACHE(nfs4_ol_stateid, 0); + if (stateid_slab == NULL) + goto out_free_file_slab; + deleg_slab = KMEM_CACHE(nfs4_delegation, 0); + if (deleg_slab == NULL) + goto out_free_stateid_slab; + odstate_slab = KMEM_CACHE(nfs4_clnt_odstate, 0); + if (odstate_slab == NULL) + goto out_free_deleg_slab; + return 0; + +out_free_deleg_slab: + kmem_cache_destroy(deleg_slab); +out_free_stateid_slab: + kmem_cache_destroy(stateid_slab); +out_free_file_slab: + kmem_cache_destroy(file_slab); +out_free_lockowner_slab: + kmem_cache_destroy(lockowner_slab); +out_free_openowner_slab: + kmem_cache_destroy(openowner_slab); +out_free_client_slab: + kmem_cache_destroy(client_slab); +out: + return -ENOMEM; +} + +static unsigned long +nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc) +{ + struct nfsd_net *nn = shrink->private_data; + long count; + + count = atomic_read(&nn->nfsd_courtesy_clients); + if (!count) + count = atomic_long_read(&num_delegations); + if (count) + queue_work(laundry_wq, &nn->nfsd_shrinker_work); + return (unsigned long)count; +} + +static unsigned long +nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc) +{ + return SHRINK_STOP; +} + +void +nfsd4_init_leases_net(struct nfsd_net *nn) +{ + struct sysinfo si; + u64 max_clients; + + nn->nfsd4_lease = 90; /* default lease time */ + nn->nfsd4_grace = 90; + nn->somebody_reclaimed = false; + nn->track_reclaim_completes = false; + nn->clverifier_counter = get_random_u32(); + nn->clientid_base = get_random_u32(); + nn->clientid_counter = nn->clientid_base + 1; + nn->s2s_cp_cl_id = nn->clientid_counter++; + + atomic_set(&nn->nfs4_client_count, 0); + si_meminfo(&si); + max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024); + max_clients *= NFS4_CLIENTS_PER_GB; + nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB); + + atomic_set(&nn->nfsd_courtesy_clients, 0); +} + +enum rp_lock { + RP_UNLOCKED, + RP_LOCKED, + RP_UNHASHED, +}; + +static void init_nfs4_replay(struct nfs4_replay *rp) +{ + rp->rp_status = nfserr_serverfault; + rp->rp_buflen = 0; + rp->rp_buf = rp->rp_ibuf; + rp->rp_locked = RP_UNLOCKED; +} + +static int nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate, + struct nfs4_stateowner *so) +{ + if (!nfsd4_has_session(cstate)) { + wait_var_event(&so->so_replay.rp_locked, + cmpxchg(&so->so_replay.rp_locked, + RP_UNLOCKED, RP_LOCKED) != RP_LOCKED); + if (so->so_replay.rp_locked == RP_UNHASHED) + return -EAGAIN; + cstate->replay_owner = nfs4_get_stateowner(so); + } + return 0; +} + +void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate) +{ + struct nfs4_stateowner *so = cstate->replay_owner; + + if (so != NULL) { + cstate->replay_owner = NULL; + store_release_wake_up(&so->so_replay.rp_locked, RP_UNLOCKED); + nfs4_put_stateowner(so); + } +} + +static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp) +{ + struct nfs4_stateowner *sop; + + sop = kmem_cache_alloc(slab, GFP_KERNEL); + if (!sop) + return NULL; + + xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL); + if (!sop->so_owner.data) { + kmem_cache_free(slab, sop); + return NULL; + } + + INIT_LIST_HEAD(&sop->so_stateids); + sop->so_client = clp; + init_nfs4_replay(&sop->so_replay); + atomic_set(&sop->so_count, 1); + return sop; +} + +static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval) +{ + lockdep_assert_held(&clp->cl_lock); + + list_add(&oo->oo_owner.so_strhash, + &clp->cl_ownerstr_hashtbl[strhashval]); + list_add(&oo->oo_perclient, &clp->cl_openowners); +} + +static void nfs4_unhash_openowner(struct nfs4_stateowner *so) +{ + unhash_openowner_locked(openowner(so)); +} + +static void nfs4_free_openowner(struct nfs4_stateowner *so) +{ + struct nfs4_openowner *oo = openowner(so); + + kmem_cache_free(openowner_slab, oo); +} + +static const struct nfs4_stateowner_operations openowner_ops = { + .so_unhash = nfs4_unhash_openowner, + .so_free = nfs4_free_openowner, +}; + +static struct nfs4_ol_stateid * +nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open) +{ + struct nfs4_ol_stateid *local, *ret = NULL; + struct nfs4_openowner *oo = open->op_openowner; + + lockdep_assert_held(&fp->fi_lock); + + list_for_each_entry(local, &fp->fi_stateids, st_perfile) { + /* ignore lock owners */ + if (local->st_stateowner->so_is_open_owner == 0) + continue; + if (local->st_stateowner != &oo->oo_owner) + continue; + if (local->st_stid.sc_type == SC_TYPE_OPEN && + !local->st_stid.sc_status) { + ret = local; + refcount_inc(&ret->st_stid.sc_count); + break; + } + } + return ret; +} + +static void nfsd4_drop_revoked_stid(struct nfs4_stid *s) + __releases(&s->sc_client->cl_lock) +{ + struct nfs4_client *cl = s->sc_client; + LIST_HEAD(reaplist); + struct nfs4_layout_stateid *ls; + struct nfs4_ol_stateid *stp; + struct nfs4_delegation *dp; + bool unhashed; + + switch (s->sc_type) { + case SC_TYPE_OPEN: + stp = openlockstateid(s); + if (unhash_open_stateid(stp, &reaplist)) + put_ol_stateid_locked(stp, &reaplist); + spin_unlock(&cl->cl_lock); + free_ol_stateid_reaplist(&reaplist); + break; + case SC_TYPE_LOCK: + stp = openlockstateid(s); + unhashed = unhash_lock_stateid(stp); + spin_unlock(&cl->cl_lock); + if (unhashed) + nfs4_put_stid(s); + break; + case SC_TYPE_DELEG: + dp = delegstateid(s); + list_del_init(&dp->dl_recall_lru); + spin_unlock(&cl->cl_lock); + nfs4_put_stid(s); + break; + case SC_TYPE_LAYOUT: + ls = layoutstateid(s); + list_del_init(&ls->ls_perclnt); + spin_unlock(&cl->cl_lock); + nfs4_put_stid(s); + break; + default: + spin_unlock(&cl->cl_lock); + } +} + +static void nfsd40_drop_revoked_stid(struct nfs4_client *cl, + stateid_t *stid) +{ + /* NFSv4.0 has no way for the client to tell the server + * that it can forget an admin-revoked stateid. + * So we keep it around until the first time that the + * client uses it, and drop it the first time + * nfserr_admin_revoked is returned. + * For v4.1 and later we wait until explicitly told + * to free the stateid. + */ + if (cl->cl_minorversion == 0) { + struct nfs4_stid *st; + + spin_lock(&cl->cl_lock); + st = find_stateid_locked(cl, stid); + if (st) + nfsd4_drop_revoked_stid(st); + else + spin_unlock(&cl->cl_lock); + } +} + +static __be32 +nfsd4_verify_open_stid(struct nfs4_stid *s) +{ + __be32 ret = nfs_ok; + + if (s->sc_status & SC_STATUS_ADMIN_REVOKED) + ret = nfserr_admin_revoked; + else if (s->sc_status & SC_STATUS_REVOKED) + ret = nfserr_deleg_revoked; + else if (s->sc_status & SC_STATUS_CLOSED) + ret = nfserr_bad_stateid; + return ret; +} + +/* Lock the stateid st_mutex, and deal with races with CLOSE */ +static __be32 +nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp) +{ + __be32 ret; + + mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX); + ret = nfsd4_verify_open_stid(&stp->st_stid); + if (ret == nfserr_admin_revoked) + nfsd40_drop_revoked_stid(stp->st_stid.sc_client, + &stp->st_stid.sc_stateid); + + if (ret != nfs_ok) + mutex_unlock(&stp->st_mutex); + return ret; +} + +static struct nfs4_ol_stateid * +nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open) +{ + struct nfs4_ol_stateid *stp; + for (;;) { + spin_lock(&fp->fi_lock); + stp = nfsd4_find_existing_open(fp, open); + spin_unlock(&fp->fi_lock); + if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok) + break; + nfs4_put_stid(&stp->st_stid); + } + return stp; +} + +static struct nfs4_openowner * +find_or_alloc_open_stateowner(unsigned int strhashval, struct nfsd4_open *open, + struct nfsd4_compound_state *cstate) +{ + struct nfs4_client *clp = cstate->clp; + struct nfs4_openowner *oo, *new = NULL; + +retry: + spin_lock(&clp->cl_lock); + oo = find_openstateowner_str(strhashval, open, clp); + if (!oo && new) { + hash_openowner(new, clp, strhashval); + spin_unlock(&clp->cl_lock); + return new; + } + spin_unlock(&clp->cl_lock); + + if (oo && !(oo->oo_flags & NFS4_OO_CONFIRMED)) { + /* Replace unconfirmed owners without checking for replay. */ + release_openowner(oo); + oo = NULL; + goto retry; + } + if (oo) { + if (new) + nfs4_free_stateowner(&new->oo_owner); + return oo; + } + + new = alloc_stateowner(openowner_slab, &open->op_owner, clp); + if (!new) + return NULL; + new->oo_owner.so_ops = &openowner_ops; + new->oo_owner.so_is_open_owner = 1; + new->oo_owner.so_seqid = open->op_seqid; + new->oo_flags = 0; + if (nfsd4_has_session(cstate)) + new->oo_flags |= NFS4_OO_CONFIRMED; + new->oo_time = 0; + new->oo_last_closed_stid = NULL; + INIT_LIST_HEAD(&new->oo_close_lru); + goto retry; +} + +static struct nfs4_ol_stateid * +init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open) +{ + + struct nfs4_openowner *oo = open->op_openowner; + struct nfs4_ol_stateid *retstp = NULL; + struct nfs4_ol_stateid *stp; + + stp = open->op_stp; + /* We are moving these outside of the spinlocks to avoid the warnings */ + mutex_init(&stp->st_mutex); + mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX); + +retry: + spin_lock(&oo->oo_owner.so_client->cl_lock); + spin_lock(&fp->fi_lock); + + if (nfs4_openowner_unhashed(oo)) { + mutex_unlock(&stp->st_mutex); + stp = NULL; + goto out_unlock; + } + + retstp = nfsd4_find_existing_open(fp, open); + if (retstp) + goto out_unlock; + + open->op_stp = NULL; + refcount_inc(&stp->st_stid.sc_count); + stp->st_stid.sc_type = SC_TYPE_OPEN; + INIT_LIST_HEAD(&stp->st_locks); + stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner); + get_nfs4_file(fp); + stp->st_stid.sc_file = fp; + stp->st_access_bmap = 0; + stp->st_deny_bmap = 0; + stp->st_openstp = NULL; + list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids); + list_add(&stp->st_perfile, &fp->fi_stateids); + +out_unlock: + spin_unlock(&fp->fi_lock); + spin_unlock(&oo->oo_owner.so_client->cl_lock); + if (retstp) { + /* Handle races with CLOSE */ + if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) { + nfs4_put_stid(&retstp->st_stid); + goto retry; + } + /* To keep mutex tracking happy */ + mutex_unlock(&stp->st_mutex); + stp = retstp; + } + return stp; +} + +/* + * In the 4.0 case we need to keep the owners around a little while to handle + * CLOSE replay. We still do need to release any file access that is held by + * them before returning however. + */ +static void +move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net) +{ + struct nfs4_ol_stateid *last; + struct nfs4_openowner *oo = openowner(s->st_stateowner); + struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net, + nfsd_net_id); + + dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo); + + /* + * We know that we hold one reference via nfsd4_close, and another + * "persistent" reference for the client. If the refcount is higher + * than 2, then there are still calls in progress that are using this + * stateid. We can't put the sc_file reference until they are finished. + * Wait for the refcount to drop to 2. Since it has been unhashed, + * there should be no danger of the refcount going back up again at + * this point. + * Some threads with a reference might be waiting for rp_locked, + * so tell them to stop waiting. + */ + store_release_wake_up(&oo->oo_owner.so_replay.rp_locked, RP_UNHASHED); + wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2); + + release_all_access(s); + if (s->st_stid.sc_file) { + put_nfs4_file(s->st_stid.sc_file); + s->st_stid.sc_file = NULL; + } + + spin_lock(&nn->client_lock); + last = oo->oo_last_closed_stid; + oo->oo_last_closed_stid = s; + list_move_tail(&oo->oo_close_lru, &nn->close_lru); + oo->oo_time = ktime_get_boottime_seconds(); + spin_unlock(&nn->client_lock); + if (last) + nfs4_put_stid(&last->st_stid); +} + +static noinline_for_stack struct nfs4_file * +nfsd4_file_hash_lookup(const struct svc_fh *fhp) +{ + struct inode *inode = d_inode(fhp->fh_dentry); + struct rhlist_head *tmp, *list; + struct nfs4_file *fi; + + rcu_read_lock(); + list = rhltable_lookup(&nfs4_file_rhltable, &inode, + nfs4_file_rhash_params); + rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) { + if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) { + if (refcount_inc_not_zero(&fi->fi_ref)) { + rcu_read_unlock(); + return fi; + } + } + } + rcu_read_unlock(); + return NULL; +} + +/* + * On hash insertion, identify entries with the same inode but + * distinct filehandles. They will all be on the list returned + * by rhltable_lookup(). + * + * inode->i_lock prevents racing insertions from adding an entry + * for the same inode/fhp pair twice. + */ +static noinline_for_stack struct nfs4_file * +nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp) +{ + struct inode *inode = d_inode(fhp->fh_dentry); + struct rhlist_head *tmp, *list; + struct nfs4_file *ret = NULL; + bool alias_found = false; + struct nfs4_file *fi; + int err; + + rcu_read_lock(); + spin_lock(&inode->i_lock); + + list = rhltable_lookup(&nfs4_file_rhltable, &inode, + nfs4_file_rhash_params); + rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) { + if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) { + if (refcount_inc_not_zero(&fi->fi_ref)) + ret = fi; + } else + fi->fi_aliased = alias_found = true; + } + if (ret) + goto out_unlock; + + nfsd4_file_init(fhp, new); + err = rhltable_insert(&nfs4_file_rhltable, &new->fi_rlist, + nfs4_file_rhash_params); + if (err) + goto out_unlock; + + new->fi_aliased = alias_found; + ret = new; + +out_unlock: + spin_unlock(&inode->i_lock); + rcu_read_unlock(); + return ret; +} + +static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi) +{ + rhltable_remove(&nfs4_file_rhltable, &fi->fi_rlist, + nfs4_file_rhash_params); +} + +/* + * Called to check deny when READ with all zero stateid or + * WRITE with all zero or all one stateid + */ +static __be32 +nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) +{ + struct nfs4_file *fp; + __be32 ret = nfs_ok; + + fp = nfsd4_file_hash_lookup(current_fh); + if (!fp) + return ret; + + /* Check for conflicting share reservations */ + spin_lock(&fp->fi_lock); + if (fp->fi_share_deny & deny_type) + ret = nfserr_locked; + spin_unlock(&fp->fi_lock); + put_nfs4_file(fp); + return ret; +} + +static bool nfsd4_deleg_present(const struct inode *inode) +{ + struct file_lock_context *ctx = locks_inode_context(inode); + + return ctx && !list_empty_careful(&ctx->flc_lease); +} + +/** + * nfsd_wait_for_delegreturn - wait for delegations to be returned + * @rqstp: the RPC transaction being executed + * @inode: in-core inode of the file being waited for + * + * The timeout prevents deadlock if all nfsd threads happen to be + * tied up waiting for returning delegations. + * + * Return values: + * %true: delegation was returned + * %false: timed out waiting for delegreturn + */ +bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode) +{ + long __maybe_unused timeo; + + timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode), + NFSD_DELEGRETURN_TIMEOUT); + trace_nfsd_delegret_wakeup(rqstp, inode, timeo); + return timeo > 0; +} + +static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb) +{ + struct nfs4_delegation *dp = cb_to_delegation(cb); + struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net, + nfsd_net_id); + + block_delegations(&dp->dl_stid.sc_file->fi_fhandle); + + /* + * We can't do this in nfsd_break_deleg_cb because it is + * already holding inode->i_lock. + * + * If the dl_time != 0, then we know that it has already been + * queued for a lease break. Don't queue it again. + */ + spin_lock(&nn->deleg_lock); + if (delegation_hashed(dp) && dp->dl_time == 0) { + dp->dl_time = ktime_get_boottime_seconds(); + list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru); + } + spin_unlock(&nn->deleg_lock); +} + +static int nfsd4_cb_recall_done(struct nfsd4_callback *cb, + struct rpc_task *task) +{ + struct nfs4_delegation *dp = cb_to_delegation(cb); + + trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task); + + if (dp->dl_stid.sc_status) + /* CLOSED or REVOKED */ + return 1; + + switch (task->tk_status) { + case 0: + return 1; + case -NFS4ERR_DELAY: + rpc_delay(task, 2 * HZ); + return 0; + case -EBADHANDLE: + case -NFS4ERR_BAD_STATEID: + /* + * Race: client probably got cb_recall before open reply + * granting delegation. + */ + if (dp->dl_retries--) { + rpc_delay(task, 2 * HZ); + return 0; + } + fallthrough; + default: + return 1; + } +} + +static void nfsd4_cb_recall_release(struct nfsd4_callback *cb) +{ + struct nfs4_delegation *dp = cb_to_delegation(cb); + + nfs4_put_stid(&dp->dl_stid); +} + +static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = { + .prepare = nfsd4_cb_recall_prepare, + .done = nfsd4_cb_recall_done, + .release = nfsd4_cb_recall_release, + .opcode = OP_CB_RECALL, +}; + +static void nfsd_break_one_deleg(struct nfs4_delegation *dp) +{ + bool queued; + + if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &dp->dl_recall.cb_flags)) + return; + + /* + * We're assuming the state code never drops its reference + * without first removing the lease. Since we're in this lease + * callback (and since the lease code is serialized by the + * flc_lock) we know the server hasn't removed the lease yet, and + * we know it's safe to take a reference. + */ + refcount_inc(&dp->dl_stid.sc_count); + queued = nfsd4_run_cb(&dp->dl_recall); + WARN_ON_ONCE(!queued); + if (!queued) + refcount_dec(&dp->dl_stid.sc_count); +} + +/* Called from break_lease() with flc_lock held. */ +static bool +nfsd_break_deleg_cb(struct file_lease *fl) +{ + struct nfs4_delegation *dp = (struct nfs4_delegation *) fl->c.flc_owner; + struct nfs4_file *fp = dp->dl_stid.sc_file; + struct nfs4_client *clp = dp->dl_stid.sc_client; + struct nfsd_net *nn; + + trace_nfsd_cb_recall(&dp->dl_stid); + + dp->dl_recalled = true; + atomic_inc(&clp->cl_delegs_in_recall); + if (try_to_expire_client(clp)) { + nn = net_generic(clp->net, nfsd_net_id); + mod_delayed_work(laundry_wq, &nn->laundromat_work, 0); + } + + /* + * We don't want the locks code to timeout the lease for us; + * we'll remove it ourself if a delegation isn't returned + * in time: + */ + fl->fl_break_time = 0; + + fp->fi_had_conflict = true; + nfsd_break_one_deleg(dp); + return false; +} + +/** + * nfsd_breaker_owns_lease - Check if lease conflict was resolved + * @fl: Lock state to check + * + * Return values: + * %true: Lease conflict was resolved + * %false: Lease conflict was not resolved. + */ +static bool nfsd_breaker_owns_lease(struct file_lease *fl) +{ + struct nfs4_delegation *dl = fl->c.flc_owner; + struct nfsd_thread_local_info *ntli; + struct svc_rqst *rqst; + struct nfs4_client *clp; + + rqst = nfsd_current_rqst(); + if (!nfsd_v4client(rqst)) + return false; + ntli = rqst->rq_private; + clp = *ntli->ntli_lease_breaker; + return dl->dl_stid.sc_client == clp; +} + +static int +nfsd_change_deleg_cb(struct file_lease *onlist, int arg, + struct list_head *dispose) +{ + struct nfs4_delegation *dp = (struct nfs4_delegation *) onlist->c.flc_owner; + struct nfs4_client *clp = dp->dl_stid.sc_client; + + if (arg & F_UNLCK) { + if (dp->dl_recalled) + atomic_dec(&clp->cl_delegs_in_recall); + return lease_modify(onlist, arg, dispose); + } else + return -EAGAIN; +} + +/** + * nfsd4_deleg_lm_open_conflict - see if the given file points to an inode that has + * an existing open that would conflict with the + * desired lease. + * @filp: file to check + * @arg: type of lease that we're trying to acquire + * + * The kernel will call into this operation to determine whether there + * are conflicting opens that may prevent the deleg from being granted. + * For nfsd, that check is done at a higher level, so this trivially + * returns 0. + */ +static int +nfsd4_deleg_lm_open_conflict(struct file *filp, int arg) +{ + return 0; +} + +static const struct lease_manager_operations nfsd_lease_mng_ops = { + .lm_breaker_owns_lease = nfsd_breaker_owns_lease, + .lm_break = nfsd_break_deleg_cb, + .lm_change = nfsd_change_deleg_cb, + .lm_open_conflict = nfsd4_deleg_lm_open_conflict, +}; + +static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid) +{ + if (nfsd4_has_session(cstate)) + return nfs_ok; + if (seqid == so->so_seqid - 1) + return nfserr_replay_me; + if (seqid == so->so_seqid) + return nfs_ok; + return nfserr_bad_seqid; +} + +static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions, + struct nfsd_net *nn) +{ + struct nfs4_client *found; + + spin_lock(&nn->client_lock); + found = find_confirmed_client(clid, sessions, nn); + if (found) + atomic_inc(&found->cl_rpc_users); + spin_unlock(&nn->client_lock); + return found; +} + +static __be32 set_client(clientid_t *clid, + struct nfsd4_compound_state *cstate, + struct nfsd_net *nn) +{ + if (cstate->clp) { + if (!same_clid(&cstate->clp->cl_clientid, clid)) + return nfserr_stale_clientid; + return nfs_ok; + } + if (STALE_CLIENTID(clid, nn)) + return nfserr_stale_clientid; + /* + * We're in the 4.0 case (otherwise the SEQUENCE op would have + * set cstate->clp), so session = false: + */ + cstate->clp = lookup_clientid(clid, false, nn); + if (!cstate->clp) + return nfserr_expired; + return nfs_ok; +} + +__be32 +nfsd4_process_open1(struct nfsd4_compound_state *cstate, + struct nfsd4_open *open, struct nfsd_net *nn) +{ + clientid_t *clientid = &open->op_clientid; + struct nfs4_client *clp = NULL; + unsigned int strhashval; + struct nfs4_openowner *oo = NULL; + __be32 status; + + /* + * In case we need it later, after we've already created the + * file and don't want to risk a further failure: + */ + open->op_file = nfsd4_alloc_file(); + if (open->op_file == NULL) + return nfserr_jukebox; + + status = set_client(clientid, cstate, nn); + if (status) + return status; + clp = cstate->clp; + + strhashval = ownerstr_hashval(&open->op_owner); +retry: + oo = find_or_alloc_open_stateowner(strhashval, open, cstate); + open->op_openowner = oo; + if (!oo) + return nfserr_jukebox; + if (nfsd4_cstate_assign_replay(cstate, &oo->oo_owner) == -EAGAIN) { + nfs4_put_stateowner(&oo->oo_owner); + goto retry; + } + status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid); + if (status) + return status; + + open->op_stp = nfs4_alloc_open_stateid(clp); + if (!open->op_stp) + return nfserr_jukebox; + + if (nfsd4_has_session(cstate) && + (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) { + open->op_odstate = alloc_clnt_odstate(clp); + if (!open->op_odstate) + return nfserr_jukebox; + } + + return nfs_ok; +} + +static inline __be32 +nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) +{ + if (!(flags & RD_STATE) && deleg_is_read(dp->dl_type)) + return nfserr_openmode; + else + return nfs_ok; +} + +static int share_access_to_flags(u32 share_access) +{ + return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; +} + +static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, + stateid_t *s) +{ + struct nfs4_stid *ret; + + ret = find_stateid_by_type(cl, s, SC_TYPE_DELEG, SC_STATUS_REVOKED); + if (!ret) + return NULL; + return delegstateid(ret); +} + +static bool nfsd4_is_deleg_cur(struct nfsd4_open *open) +{ + return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR || + open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH; +} + +static __be32 +nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open, + struct nfs4_delegation **dp) +{ + int flags; + __be32 status = nfserr_bad_stateid; + struct nfs4_delegation *deleg; + + deleg = find_deleg_stateid(cl, &open->op_delegate_stateid); + if (deleg == NULL) + goto out; + if (deleg->dl_stid.sc_status & SC_STATUS_ADMIN_REVOKED) { + nfs4_put_stid(&deleg->dl_stid); + status = nfserr_admin_revoked; + goto out; + } + if (deleg->dl_stid.sc_status & SC_STATUS_REVOKED) { + nfs4_put_stid(&deleg->dl_stid); + nfsd40_drop_revoked_stid(cl, &open->op_delegate_stateid); + status = nfserr_deleg_revoked; + goto out; + } + flags = share_access_to_flags(open->op_share_access); + status = nfs4_check_delegmode(deleg, flags); + if (status) { + nfs4_put_stid(&deleg->dl_stid); + goto out; + } + *dp = deleg; +out: + if (!nfsd4_is_deleg_cur(open)) + return nfs_ok; + if (status) + return status; + open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; + return nfs_ok; +} + +static inline int nfs4_access_to_access(u32 nfs4_access) +{ + int flags = 0; + + if (nfs4_access & NFS4_SHARE_ACCESS_READ) + flags |= NFSD_MAY_READ; + if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) + flags |= NFSD_MAY_WRITE; + return flags; +} + +static inline __be32 +nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, + struct nfsd4_open *open) +{ + struct iattr iattr = { + .ia_valid = ATTR_SIZE, + .ia_size = 0, + }; + struct nfsd_attrs attrs = { + .na_iattr = &iattr, + }; + if (!open->op_truncate) + return 0; + if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) + return nfserr_inval; + return nfsd_setattr(rqstp, fh, &attrs, NULL); +} + +static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, + struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, + struct nfsd4_open *open, bool new_stp) +{ + struct nfsd_file *nf = NULL; + __be32 status; + int oflag = nfs4_access_to_omode(open->op_share_access); + int access = nfs4_access_to_access(open->op_share_access); + unsigned char old_access_bmap, old_deny_bmap; + + spin_lock(&fp->fi_lock); + + /* + * Are we trying to set a deny mode that would conflict with + * current access? + */ + status = nfs4_file_check_deny(fp, open->op_share_deny); + if (status != nfs_ok) { + if (status != nfserr_share_denied) { + spin_unlock(&fp->fi_lock); + goto out; + } + if (nfs4_resolve_deny_conflicts_locked(fp, new_stp, + stp, open->op_share_deny, false)) + status = nfserr_jukebox; + spin_unlock(&fp->fi_lock); + goto out; + } + + /* set access to the file */ + status = nfs4_file_get_access(fp, open->op_share_access); + if (status != nfs_ok) { + if (status != nfserr_share_denied) { + spin_unlock(&fp->fi_lock); + goto out; + } + if (nfs4_resolve_deny_conflicts_locked(fp, new_stp, + stp, open->op_share_access, true)) + status = nfserr_jukebox; + spin_unlock(&fp->fi_lock); + goto out; + } + + /* Set access bits in stateid */ + old_access_bmap = stp->st_access_bmap; + set_access(open->op_share_access, stp); + + /* Set new deny mask */ + old_deny_bmap = stp->st_deny_bmap; + set_deny(open->op_share_deny, stp); + fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH); + + if (!fp->fi_fds[oflag]) { + spin_unlock(&fp->fi_lock); + + status = nfsd_file_acquire_opened(rqstp, cur_fh, access, + open->op_filp, &nf); + if (status != nfs_ok) + goto out_put_access; + + spin_lock(&fp->fi_lock); + if (!fp->fi_fds[oflag]) { + fp->fi_fds[oflag] = nf; + nf = NULL; + } + } + spin_unlock(&fp->fi_lock); + if (nf) + nfsd_file_put(nf); + + status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode, + access)); + if (status) + goto out_put_access; + + status = nfsd4_truncate(rqstp, cur_fh, open); + if (status) + goto out_put_access; +out: + return status; +out_put_access: + stp->st_access_bmap = old_access_bmap; + nfs4_file_put_access(fp, open->op_share_access); + reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp); + goto out; +} + +static __be32 +nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, + struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, + struct nfsd4_open *open) +{ + __be32 status; + unsigned char old_deny_bmap = stp->st_deny_bmap; + + if (!test_access(open->op_share_access, stp)) + return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false); + + /* test and set deny mode */ + spin_lock(&fp->fi_lock); + status = nfs4_file_check_deny(fp, open->op_share_deny); + switch (status) { + case nfs_ok: + set_deny(open->op_share_deny, stp); + fp->fi_share_deny |= + (open->op_share_deny & NFS4_SHARE_DENY_BOTH); + break; + case nfserr_share_denied: + if (nfs4_resolve_deny_conflicts_locked(fp, false, + stp, open->op_share_deny, false)) + status = nfserr_jukebox; + break; + } + spin_unlock(&fp->fi_lock); + + if (status != nfs_ok) + return status; + + status = nfsd4_truncate(rqstp, cur_fh, open); + if (status != nfs_ok) + reset_union_bmap_deny(old_deny_bmap, stp); + return status; +} + +/* Should we give out recallable state?: */ +static bool nfsd4_cb_channel_good(struct nfs4_client *clp) +{ + if (clp->cl_cb_state == NFSD4_CB_UP) + return true; + /* + * In the sessions case, since we don't have to establish a + * separate connection for callbacks, we assume it's OK + * until we hear otherwise: + */ + return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN; +} + +static struct file_lease *nfs4_alloc_init_lease(struct nfs4_delegation *dp) +{ + struct file_lease *fl; + + fl = locks_alloc_lease(); + if (!fl) + return NULL; + fl->fl_lmops = &nfsd_lease_mng_ops; + fl->c.flc_flags = FL_DELEG; + fl->c.flc_type = deleg_is_read(dp->dl_type) ? F_RDLCK : F_WRLCK; + fl->c.flc_owner = (fl_owner_t)dp; + fl->c.flc_pid = current->tgid; + fl->c.flc_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file; + return fl; +} + +static int nfsd4_check_conflicting_opens(struct nfs4_client *clp, + struct nfs4_file *fp) +{ + struct nfs4_ol_stateid *st; + struct file *f = fp->fi_deleg_file->nf_file; + struct inode *ino = file_inode(f); + int writes; + + writes = atomic_read(&ino->i_writecount); + if (!writes) + return 0; + /* + * There could be multiple filehandles (hence multiple + * nfs4_files) referencing this file, but that's not too + * common; let's just give up in that case rather than + * trying to go look up all the clients using that other + * nfs4_file as well: + */ + if (fp->fi_aliased) + return -EAGAIN; + /* + * If there's a close in progress, make sure that we see it + * clear any fi_fds[] entries before we see it decrement + * i_writecount: + */ + smp_mb__after_atomic(); + + if (fp->fi_fds[O_WRONLY]) + writes--; + if (fp->fi_fds[O_RDWR]) + writes--; + if (writes > 0) + return -EAGAIN; /* There may be non-NFSv4 writers */ + /* + * It's possible there are non-NFSv4 write opens in progress, + * but if they haven't incremented i_writecount yet then they + * also haven't called break lease yet; so, they'll break this + * lease soon enough. So, all that's left to check for is NFSv4 + * opens: + */ + spin_lock(&fp->fi_lock); + list_for_each_entry(st, &fp->fi_stateids, st_perfile) { + if (st->st_openstp == NULL /* it's an open */ && + access_permit_write(st) && + st->st_stid.sc_client != clp) { + spin_unlock(&fp->fi_lock); + return -EAGAIN; + } + } + spin_unlock(&fp->fi_lock); + /* + * There's a small chance that we could be racing with another + * NFSv4 open. However, any open that hasn't added itself to + * the fi_stateids list also hasn't called break_lease yet; so, + * they'll break this lease soon enough. + */ + return 0; +} + +/* + * It's possible that between opening the dentry and setting the delegation, + * that it has been renamed or unlinked. Redo the lookup to verify that this + * hasn't happened. + */ +static int +nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp, + struct svc_fh *parent) +{ + struct svc_export *exp; + struct dentry *child; + __be32 err; + + err = nfsd_lookup_dentry(open->op_rqstp, parent, + open->op_fname, open->op_fnamelen, + &exp, &child); + + if (err) + return -EAGAIN; + + exp_put(exp); + dput(child); + if (child != file_dentry(fp->fi_deleg_file->nf_file)) + return -EAGAIN; + + return 0; +} + +/* + * We avoid breaking delegations held by a client due to its own activity, but + * clearing setuid/setgid bits on a write is an implicit activity and the client + * may not notice and continue using the old mode. Avoid giving out a delegation + * on setuid/setgid files when the client is requesting an open for write. + */ +static int +nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf) +{ + struct inode *inode = file_inode(nf->nf_file); + + if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) && + (inode->i_mode & (S_ISUID|S_ISGID))) + return -EAGAIN; + return 0; +} + +/* + * Timestamp delegation was introduced in RFC7862. Runtime switch for disabling + * this feature is /sys/kernel/debug/nfsd/delegated_timestamps. + */ +static bool nfsd4_want_deleg_timestamps(const struct nfsd4_open *open) +{ + if (!nfsd_delegts_enabled) + return false; + return open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS; +} + +static struct nfs4_delegation * +nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp, + struct svc_fh *parent) +{ + bool deleg_ts = nfsd4_want_deleg_timestamps(open); + struct nfs4_client *clp = stp->st_stid.sc_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + struct nfs4_file *fp = stp->st_stid.sc_file; + struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate; + struct nfs4_delegation *dp; + struct nfsd_file *nf = NULL; + struct file_lease *fl; + int status = 0; + u32 dl_type; + + /* + * The fi_had_conflict and nfs_get_existing_delegation checks + * here are just optimizations; we'll need to recheck them at + * the end: + */ + if (fp->fi_had_conflict) + return ERR_PTR(-EAGAIN); + + /* + * Try for a write delegation first. RFC8881 section 10.4 says: + * + * "An OPEN_DELEGATE_WRITE delegation allows the client to handle, + * on its own, all opens." + * + * Furthermore, section 9.1.2 says: + * + * "In the case of READ, the server may perform the corresponding + * check on the access mode, or it may choose to allow READ for + * OPEN4_SHARE_ACCESS_WRITE, to accommodate clients whose WRITE + * implementation may unavoidably do reads (e.g., due to buffer + * cache constraints)." + * + * We choose to offer a write delegation for OPEN with the + * OPEN4_SHARE_ACCESS_WRITE access mode to accommodate such clients. + */ + if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) { + nf = find_writeable_file(fp); + dl_type = deleg_ts ? OPEN_DELEGATE_WRITE_ATTRS_DELEG : OPEN_DELEGATE_WRITE; + } + + /* + * If the file is being opened O_RDONLY or we couldn't get a O_RDWR + * file for some reason, then try for a read delegation instead. + */ + if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) { + nf = find_readable_file(fp); + dl_type = deleg_ts ? OPEN_DELEGATE_READ_ATTRS_DELEG : OPEN_DELEGATE_READ; + } + + if (!nf) + return ERR_PTR(-EAGAIN); + + /* + * File delegations and associated locks cannot be recovered if the + * export is from an NFS proxy server. + */ + if (exportfs_cannot_lock(nf->nf_file->f_path.mnt->mnt_sb->s_export_op)) { + nfsd_file_put(nf); + return ERR_PTR(-EOPNOTSUPP); + } + + spin_lock(&nn->deleg_lock); + spin_lock(&fp->fi_lock); + if (nfs4_delegation_exists(clp, fp)) + status = -EAGAIN; + else if (nfsd4_verify_setuid_write(open, nf)) + status = -EAGAIN; + else if (!fp->fi_deleg_file) { + fp->fi_deleg_file = nf; + /* increment early to prevent fi_deleg_file from being + * cleared */ + fp->fi_delegees = 1; + nf = NULL; + } else + fp->fi_delegees++; + spin_unlock(&fp->fi_lock); + spin_unlock(&nn->deleg_lock); + if (nf) + nfsd_file_put(nf); + if (status) + return ERR_PTR(status); + + status = -ENOMEM; + dp = alloc_init_deleg(clp, fp, odstate, dl_type); + if (!dp) + goto out_delegees; + if (stp->st_stid.sc_export) + dp->dl_stid.sc_export = exp_get(stp->st_stid.sc_export); + + fl = nfs4_alloc_init_lease(dp); + if (!fl) + goto out_clnt_odstate; + + status = kernel_setlease(fp->fi_deleg_file->nf_file, + fl->c.flc_type, &fl, NULL); + if (fl) + locks_free_lease(fl); + if (status) + goto out_clnt_odstate; + + if (parent) { + status = nfsd4_verify_deleg_dentry(open, fp, parent); + if (status) + goto out_unlock; + } + + status = nfsd4_check_conflicting_opens(clp, fp); + if (status) + goto out_unlock; + + /* + * Now that the deleg is set, check again to ensure that nothing + * raced in and changed the mode while we weren't looking. + */ + status = nfsd4_verify_setuid_write(open, fp->fi_deleg_file); + if (status) + goto out_unlock; + + status = -EAGAIN; + if (fp->fi_had_conflict) + goto out_unlock; + + spin_lock(&nn->deleg_lock); + spin_lock(&clp->cl_lock); + spin_lock(&fp->fi_lock); + status = hash_delegation_locked(dp, fp); + spin_unlock(&fp->fi_lock); + spin_unlock(&clp->cl_lock); + spin_unlock(&nn->deleg_lock); + + if (status) + goto out_unlock; + + return dp; +out_unlock: + kernel_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp); +out_clnt_odstate: + put_clnt_odstate(dp->dl_clnt_odstate); + nfs4_put_stid(&dp->dl_stid); +out_delegees: + put_deleg_file(fp); + return ERR_PTR(status); +} + +static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status) +{ + open->op_delegate_type = OPEN_DELEGATE_NONE_EXT; + if (status == -EAGAIN) + open->op_why_no_deleg = WND4_CONTENTION; + else { + open->op_why_no_deleg = WND4_RESOURCE; + switch (open->op_deleg_want) { + case OPEN4_SHARE_ACCESS_WANT_READ_DELEG: + case OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG: + case OPEN4_SHARE_ACCESS_WANT_ANY_DELEG: + break; + case OPEN4_SHARE_ACCESS_WANT_CANCEL: + open->op_why_no_deleg = WND4_CANCELLED; + break; + case OPEN4_SHARE_ACCESS_WANT_NO_DELEG: + WARN_ON_ONCE(1); + } + } +} + +static bool +nfs4_delegation_stat(struct nfs4_delegation *dp, struct svc_fh *currentfh, + struct kstat *stat) +{ + struct nfsd_file *nf = find_writeable_file(dp->dl_stid.sc_file); + struct path path; + int rc; + + if (!nf) + return false; + + path.mnt = currentfh->fh_export->ex_path.mnt; + path.dentry = file_dentry(nf->nf_file); + + rc = vfs_getattr(&path, stat, + STATX_MODE | STATX_SIZE | STATX_ATIME | + STATX_MTIME | STATX_CTIME | STATX_CHANGE_COOKIE, + AT_STATX_SYNC_AS_STAT); + + nfsd_file_put(nf); + return rc == 0; +} + +/* + * Add NFS4_SHARE_ACCESS_READ to the write delegation granted on OPEN + * with NFS4_SHARE_ACCESS_WRITE by allocating separate nfsd_file and + * struct file to be used for read with delegation stateid. + * + */ +static bool +nfsd4_add_rdaccess_to_wrdeleg(struct svc_rqst *rqstp, struct nfsd4_open *open, + struct svc_fh *fh, struct nfs4_ol_stateid *stp) +{ + struct nfs4_file *fp; + struct nfsd_file *nf = NULL; + + if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) == + NFS4_SHARE_ACCESS_WRITE) { + if (nfsd_file_acquire_opened(rqstp, fh, NFSD_MAY_READ, NULL, &nf)) + return (false); + fp = stp->st_stid.sc_file; + spin_lock(&fp->fi_lock); + if (!fp->fi_fds[O_RDONLY]) { + __nfs4_file_get_access(fp, NFS4_SHARE_ACCESS_READ); + fp->fi_fds[O_RDONLY] = nf; + fp->fi_rdeleg_file = nfsd_file_get(fp->fi_fds[O_RDONLY]); + nf = NULL; + } + spin_unlock(&fp->fi_lock); + if (nf) + nfsd_file_put(nf); + } + return true; +} + +/* + * The Linux NFS server does not offer write delegations to NFSv4.0 + * clients in order to avoid conflicts between write delegations and + * GETATTRs requesting CHANGE or SIZE attributes. + * + * With NFSv4.1 and later minorversions, the SEQUENCE operation that + * begins each COMPOUND contains a client ID. Delegation recall can + * be avoided when the server recognizes the client sending a + * GETATTR also holds write delegation it conflicts with. + * + * However, the NFSv4.0 protocol does not enable a server to + * determine that a GETATTR originated from the client holding the + * conflicting delegation versus coming from some other client. Per + * RFC 7530 Section 16.7.5, the server must recall or send a + * CB_GETATTR even when the GETATTR originates from the client that + * holds the conflicting delegation. + * + * An NFSv4.0 client can trigger a pathological situation if it + * always sends a DELEGRETURN preceded by a conflicting GETATTR in + * the same COMPOUND. COMPOUND execution will always stop at the + * GETATTR and the DELEGRETURN will never get executed. The server + * eventually revokes the delegation, which can result in loss of + * open or lock state. + */ +static void +nfs4_open_delegation(struct svc_rqst *rqstp, struct nfsd4_open *open, + struct nfs4_ol_stateid *stp, struct svc_fh *currentfh, + struct svc_fh *fh) +{ + struct nfs4_openowner *oo = openowner(stp->st_stateowner); + bool deleg_ts = nfsd4_want_deleg_timestamps(open); + struct nfs4_client *clp = stp->st_stid.sc_client; + struct svc_fh *parent = NULL; + struct nfs4_delegation *dp; + struct kstat stat; + int status = 0; + int cb_up; + + cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client); + open->op_recall = false; + switch (open->op_claim_type) { + case NFS4_OPEN_CLAIM_PREVIOUS: + if (!cb_up) + open->op_recall = true; + break; + case NFS4_OPEN_CLAIM_NULL: + parent = currentfh; + fallthrough; + case NFS4_OPEN_CLAIM_FH: + /* + * Let's not give out any delegations till everyone's + * had the chance to reclaim theirs, *and* until + * NLM locks have all been reclaimed: + */ + if (locks_in_grace(clp->net)) + goto out_no_deleg; + if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED)) + goto out_no_deleg; + if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE && + !clp->cl_minorversion) + goto out_no_deleg; + break; + default: + goto out_no_deleg; + } + dp = nfs4_set_delegation(open, stp, parent); + if (IS_ERR(dp)) + goto out_no_deleg; + + memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid)); + + if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) { + struct file *f = dp->dl_stid.sc_file->fi_deleg_file->nf_file; + + if (!nfsd4_add_rdaccess_to_wrdeleg(rqstp, open, fh, stp) || + !nfs4_delegation_stat(dp, currentfh, &stat)) { + nfs4_put_stid(&dp->dl_stid); + destroy_delegation(dp); + goto out_no_deleg; + } + open->op_delegate_type = deleg_ts ? OPEN_DELEGATE_WRITE_ATTRS_DELEG : + OPEN_DELEGATE_WRITE; + dp->dl_cb_fattr.ncf_initial_cinfo = nfsd4_change_attribute(&stat); + dp->dl_atime = stat.atime; + dp->dl_ctime = stat.ctime; + dp->dl_mtime = stat.mtime; + spin_lock(&f->f_lock); + if (deleg_ts) + f->f_mode |= FMODE_NOCMTIME; + spin_unlock(&f->f_lock); + trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid); + } else { + open->op_delegate_type = deleg_ts && nfs4_delegation_stat(dp, currentfh, &stat) ? + OPEN_DELEGATE_READ_ATTRS_DELEG : OPEN_DELEGATE_READ; + dp->dl_atime = stat.atime; + trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid); + } + nfs4_put_stid(&dp->dl_stid); + return; +out_no_deleg: + open->op_delegate_type = OPEN_DELEGATE_NONE; + + /* 4.1 client asking for a delegation? */ + if (open->op_deleg_want) + nfsd4_open_deleg_none_ext(open, status); + return; +} + +static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open, + struct nfs4_delegation *dp) +{ + if (deleg_is_write(dp->dl_type)) { + if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_READ_DELEG) { + open->op_delegate_type = OPEN_DELEGATE_NONE_EXT; + open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE; + } else if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG) { + open->op_delegate_type = OPEN_DELEGATE_NONE_EXT; + open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE; + } + } + /* Otherwise the client must be confused wanting a delegation + * it already has, therefore we don't return + * OPEN_DELEGATE_NONE_EXT and reason. + */ +} + +/* Are we returning only a delegation stateid? */ +static bool open_xor_delegation(struct nfsd4_open *open) +{ + if (!(open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION)) + return false; + /* Did we actually get a delegation? */ + if (!deleg_is_read(open->op_delegate_type) && !deleg_is_write(open->op_delegate_type)) + return false; + return true; +} + +/** + * nfsd4_process_open2 - finish open processing + * @rqstp: the RPC transaction being executed + * @current_fh: NFSv4 COMPOUND's current filehandle + * @open: OPEN arguments + * + * If successful, (1) truncate the file if open->op_truncate was + * set, (2) set open->op_stateid, (3) set open->op_delegation. + * + * Returns %nfs_ok on success; otherwise an nfs4stat value in + * network byte order is returned. + */ +__be32 +nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) +{ + struct nfsd4_compoundres *resp = rqstp->rq_resp; + struct nfs4_client *cl = open->op_openowner->oo_owner.so_client; + struct nfs4_file *fp = NULL; + struct nfs4_ol_stateid *stp = NULL; + struct nfs4_delegation *dp = NULL; + __be32 status; + bool new_stp = false; + + /* + * Lookup file; if found, lookup stateid and check open request, + * and check for delegations in the process of being recalled. + * If not found, create the nfs4_file struct + */ + fp = nfsd4_file_hash_insert(open->op_file, current_fh); + if (unlikely(!fp)) + return nfserr_jukebox; + if (fp != open->op_file) { + status = nfs4_check_deleg(cl, open, &dp); + if (status) + goto out; + if (dp && nfsd4_is_deleg_cur(open) && + (dp->dl_stid.sc_file != fp)) { + /* + * RFC8881 section 8.2.4 mandates the server to return + * NFS4ERR_BAD_STATEID if the selected table entry does + * not match the current filehandle. However returning + * NFS4ERR_BAD_STATEID in the OPEN can cause the client + * to repeatedly retry the operation with the same + * stateid, since the stateid itself is valid. To avoid + * this situation NFSD returns NFS4ERR_INVAL instead. + */ + status = nfserr_inval; + goto out; + } + stp = nfsd4_find_and_lock_existing_open(fp, open); + } else { + open->op_file = NULL; + status = nfserr_bad_stateid; + if (nfsd4_is_deleg_cur(open)) + goto out; + } + + if (!stp) { + stp = init_open_stateid(fp, open); + if (!stp) { + status = nfserr_jukebox; + goto out; + } + + if (!open->op_stp) { + new_stp = true; + stp->st_stid.sc_export = + exp_get(current_fh->fh_export); + } + } + + /* + * OPEN the file, or upgrade an existing OPEN. + * If truncate fails, the OPEN fails. + * + * stp is already locked. + */ + if (!new_stp) { + /* Stateid was found, this is an OPEN upgrade */ + status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); + if (status) { + mutex_unlock(&stp->st_mutex); + goto out; + } + } else { + status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true); + if (status) { + release_open_stateid(stp); + mutex_unlock(&stp->st_mutex); + goto out; + } + + stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp, + open->op_odstate); + if (stp->st_clnt_odstate == open->op_odstate) + open->op_odstate = NULL; + } + + nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid); + mutex_unlock(&stp->st_mutex); + + if (nfsd4_has_session(&resp->cstate)) { + if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_NO_DELEG) { + open->op_delegate_type = OPEN_DELEGATE_NONE_EXT; + open->op_why_no_deleg = WND4_NOT_WANTED; + goto nodeleg; + } + } + + /* + * Attempt to hand out a delegation. No error return, because the + * OPEN succeeds even if we fail. + */ + nfs4_open_delegation(rqstp, open, stp, + &resp->cstate.current_fh, current_fh); + + /* + * If there is an existing open stateid, it must be updated and + * returned. Only respect WANT_OPEN_XOR_DELEGATION when a new + * open stateid would have to be created. + */ + if (new_stp && open_xor_delegation(open)) { + memcpy(&open->op_stateid, &zero_stateid, sizeof(open->op_stateid)); + open->op_rflags |= OPEN4_RESULT_NO_OPEN_STATEID; + release_open_stateid(stp); + } +nodeleg: + status = nfs_ok; + trace_nfsd_open(&stp->st_stid.sc_stateid); +out: + /* 4.1 client trying to upgrade/downgrade delegation? */ + if (open->op_delegate_type == OPEN_DELEGATE_NONE && dp && + open->op_deleg_want) + nfsd4_deleg_xgrade_none_ext(open, dp); + + if (fp) + put_nfs4_file(fp); + if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) + open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; + /* + * To finish the open response, we just need to set the rflags. + */ + open->op_rflags |= NFS4_OPEN_RESULT_LOCKTYPE_POSIX; + if (nfsd4_has_session(&resp->cstate)) + open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK; + else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED)) + open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; + + if (dp) + nfs4_put_stid(&dp->dl_stid); + if (stp) + nfs4_put_stid(&stp->st_stid); + + return status; +} + +void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate, + struct nfsd4_open *open) +{ + if (open->op_openowner) + nfs4_put_stateowner(&open->op_openowner->oo_owner); + if (open->op_file) + kmem_cache_free(file_slab, open->op_file); + if (open->op_stp) + nfs4_put_stid(&open->op_stp->st_stid); + if (open->op_odstate) + kmem_cache_free(odstate_slab, open->op_odstate); +} + +__be32 +nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + clientid_t *clid = &u->renew; + struct nfs4_client *clp; + __be32 status; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + trace_nfsd_clid_renew(clid); + status = set_client(clid, cstate, nn); + if (status) + return status; + clp = cstate->clp; + if (!list_empty(&clp->cl_delegations) + && clp->cl_cb_state != NFSD4_CB_UP) + return nfserr_cb_path_down; + return nfs_ok; +} + +static void +nfsd4_end_grace(struct nfsd_net *nn) +{ + /* do nothing if grace period already ended */ + if (nn->grace_ended) + return; + + trace_nfsd_grace_complete(nn); + nn->grace_ended = true; + /* + * If the server goes down again right now, an NFSv4 + * client will still be allowed to reclaim after it comes back up, + * even if it hasn't yet had a chance to reclaim state this time. + * + */ + nfsd4_record_grace_done(nn); + /* + * At this point, NFSv4 clients can still reclaim. But if the + * server crashes, any that have not yet reclaimed will be out + * of luck on the next boot. + * + * (NFSv4.1+ clients are considered to have reclaimed once they + * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to + * have reclaimed after their first OPEN.) + */ + locks_end_grace(&nn->nfsd4_manager); + /* + * At this point, and once lockd and/or any other containers + * exit their grace period, further reclaims will fail and + * regular locking can resume. + */ +} + +/** + * nfsd4_force_end_grace - forcibly end the NFSv4 grace period + * @nn: network namespace for the server instance to be updated + * + * Forces bypass of normal grace period completion, then schedules + * the laundromat to end the grace period immediately. Does not wait + * for the grace period to fully terminate before returning. + * + * Return values: + * %true: Grace termination schedule + * %false: No action was taken + */ +bool nfsd4_force_end_grace(struct nfsd_net *nn) +{ + if (!nn->client_tracking_ops) + return false; + if (READ_ONCE(nn->grace_ended)) + return false; + /* laundromat_work must be initialised now, though it might be disabled */ + WRITE_ONCE(nn->grace_end_forced, true); + /* mod_delayed_work() doesn't queue work after + * nfs4_state_shutdown_net() has called disable_delayed_work_sync() + */ + mod_delayed_work(laundry_wq, &nn->laundromat_work, 0); + return true; +} + +/* + * If we've waited a lease period but there are still clients trying to + * reclaim, wait a little longer to give them a chance to finish. + */ +static bool clients_still_reclaiming(struct nfsd_net *nn) +{ + time64_t double_grace_period_end = nn->boot_time + + 2 * nn->nfsd4_lease; + + if (READ_ONCE(nn->grace_end_forced)) + return false; + if (nn->track_reclaim_completes && + atomic_read(&nn->nr_reclaim_complete) == + nn->reclaim_str_hashtbl_size) + return false; + if (!nn->somebody_reclaimed) + return false; + nn->somebody_reclaimed = false; + /* + * If we've given them *two* lease times to reclaim, and they're + * still not done, give up: + */ + if (ktime_get_boottime_seconds() > double_grace_period_end) + return false; + return true; +} + +struct laundry_time { + time64_t cutoff; + time64_t new_timeo; +}; + +static bool state_expired(struct laundry_time *lt, time64_t last_refresh) +{ + time64_t time_remaining; + + if (last_refresh < lt->cutoff) + return true; + time_remaining = last_refresh - lt->cutoff; + lt->new_timeo = min(lt->new_timeo, time_remaining); + return false; +} + +#ifdef CONFIG_NFSD_V4_2_INTER_SSC +void nfsd4_ssc_init_umount_work(struct nfsd_net *nn) +{ + spin_lock_init(&nn->nfsd_ssc_lock); + INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list); + init_waitqueue_head(&nn->nfsd_ssc_waitq); +} + +/* + * This is called when nfsd is being shutdown, after all inter_ssc + * cleanup were done, to destroy the ssc delayed unmount list. + */ +static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn) +{ + struct nfsd4_ssc_umount_item *ni = NULL; + struct nfsd4_ssc_umount_item *tmp; + + spin_lock(&nn->nfsd_ssc_lock); + list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) { + list_del(&ni->nsui_list); + spin_unlock(&nn->nfsd_ssc_lock); + mntput(ni->nsui_vfsmount); + kfree(ni); + spin_lock(&nn->nfsd_ssc_lock); + } + spin_unlock(&nn->nfsd_ssc_lock); +} + +static void nfsd4_ssc_expire_umount(struct nfsd_net *nn) +{ + bool do_wakeup = false; + struct nfsd4_ssc_umount_item *ni = NULL; + struct nfsd4_ssc_umount_item *tmp; + + spin_lock(&nn->nfsd_ssc_lock); + list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) { + if (time_after(jiffies, ni->nsui_expire)) { + if (refcount_read(&ni->nsui_refcnt) > 1) + continue; + + /* mark being unmount */ + ni->nsui_busy = true; + spin_unlock(&nn->nfsd_ssc_lock); + mntput(ni->nsui_vfsmount); + spin_lock(&nn->nfsd_ssc_lock); + + /* waiters need to start from begin of list */ + list_del(&ni->nsui_list); + kfree(ni); + + /* wakeup ssc_connect waiters */ + do_wakeup = true; + continue; + } + break; + } + if (do_wakeup) + wake_up_all(&nn->nfsd_ssc_waitq); + spin_unlock(&nn->nfsd_ssc_lock); +} +#endif + +/* Check if any lock belonging to this lockowner has any blockers */ +static bool +nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo) +{ + struct file_lock_context *ctx; + struct nfs4_ol_stateid *stp; + struct nfs4_file *nf; + + list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) { + nf = stp->st_stid.sc_file; + ctx = locks_inode_context(nf->fi_inode); + if (!ctx) + continue; + if (locks_owner_has_blockers(ctx, lo)) + return true; + } + return false; +} + +static bool +nfs4_anylock_blockers(struct nfs4_client *clp) +{ + int i; + struct nfs4_stateowner *so; + struct nfs4_lockowner *lo; + + if (atomic_read(&clp->cl_delegs_in_recall)) + return true; + spin_lock(&clp->cl_lock); + for (i = 0; i < OWNER_HASH_SIZE; i++) { + list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i], + so_strhash) { + if (so->so_is_open_owner) + continue; + lo = lockowner(so); + if (nfs4_lockowner_has_blockers(lo)) { + spin_unlock(&clp->cl_lock); + return true; + } + } + } + spin_unlock(&clp->cl_lock); + return false; +} + +static void +nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist, + struct laundry_time *lt) +{ + unsigned int maxreap, reapcnt = 0; + struct list_head *pos, *next; + struct nfs4_client *clp; + + maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ? + NFSD_CLIENT_MAX_TRIM_PER_RUN : 0; + INIT_LIST_HEAD(reaplist); + spin_lock(&nn->client_lock); + list_for_each_safe(pos, next, &nn->client_lru) { + clp = list_entry(pos, struct nfs4_client, cl_lru); + if (clp->cl_state == NFSD4_EXPIRABLE) + goto exp_client; + if (!state_expired(lt, clp->cl_time)) + break; + if (!atomic_read(&clp->cl_rpc_users)) { + if (clp->cl_state == NFSD4_ACTIVE) + atomic_inc(&nn->nfsd_courtesy_clients); + clp->cl_state = NFSD4_COURTESY; + } + if (!client_has_state(clp)) + goto exp_client; + if (!nfs4_anylock_blockers(clp)) + if (reapcnt >= maxreap) + continue; +exp_client: + if (!mark_client_expired_locked(clp)) { + list_add(&clp->cl_lru, reaplist); + reapcnt++; + } + } + spin_unlock(&nn->client_lock); +} + +static void +nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn, + struct list_head *reaplist) +{ + unsigned int maxreap = 0, reapcnt = 0; + struct list_head *pos, *next; + struct nfs4_client *clp; + + maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN; + INIT_LIST_HEAD(reaplist); + + spin_lock(&nn->client_lock); + list_for_each_safe(pos, next, &nn->client_lru) { + clp = list_entry(pos, struct nfs4_client, cl_lru); + if (clp->cl_state == NFSD4_ACTIVE) + break; + if (reapcnt >= maxreap) + break; + if (!mark_client_expired_locked(clp)) { + list_add(&clp->cl_lru, reaplist); + reapcnt++; + } + } + spin_unlock(&nn->client_lock); +} + +static void +nfs4_process_client_reaplist(struct list_head *reaplist) +{ + struct list_head *pos, *next; + struct nfs4_client *clp; + + list_for_each_safe(pos, next, reaplist) { + clp = list_entry(pos, struct nfs4_client, cl_lru); + trace_nfsd_clid_purged(&clp->cl_clientid); + list_del_init(&clp->cl_lru); + expire_client(clp); + } +} + +static void nfs40_clean_admin_revoked(struct nfsd_net *nn, + struct laundry_time *lt) +{ + struct nfs4_client *clp; + + spin_lock(&nn->client_lock); + if (nn->nfs40_last_revoke == 0 || + nn->nfs40_last_revoke > lt->cutoff) { + spin_unlock(&nn->client_lock); + return; + } + nn->nfs40_last_revoke = 0; + +retry: + list_for_each_entry(clp, &nn->client_lru, cl_lru) { + unsigned long id, tmp; + struct nfs4_stid *stid; + + if (atomic_read(&clp->cl_admin_revoked) == 0) + continue; + + spin_lock(&clp->cl_lock); + idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id) + if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) { + refcount_inc(&stid->sc_count); + spin_unlock(&nn->client_lock); + /* this function drops ->cl_lock */ + nfsd4_drop_revoked_stid(stid); + nfs4_put_stid(stid); + spin_lock(&nn->client_lock); + goto retry; + } + spin_unlock(&clp->cl_lock); + } + spin_unlock(&nn->client_lock); +} + +static time64_t +nfs4_laundromat(struct nfsd_net *nn) +{ + struct nfs4_openowner *oo; + struct nfs4_delegation *dp; + struct nfs4_ol_stateid *stp; + struct nfsd4_blocked_lock *nbl; + struct list_head *pos, *next, reaplist; + struct laundry_time lt = { + .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease, + .new_timeo = nn->nfsd4_lease + }; + struct nfs4_cpntf_state *cps; + copy_stateid_t *cps_t; + int i; + + if (clients_still_reclaiming(nn)) { + lt.new_timeo = 0; + goto out; + } + nfsd4_end_grace(nn); + + spin_lock(&nn->s2s_cp_lock); + idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) { + cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid); + if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID && + state_expired(<, cps->cpntf_time)) + _free_cpntf_state_locked(nn, cps); + } + spin_unlock(&nn->s2s_cp_lock); + nfsd4_async_copy_reaper(nn); + nfs4_get_client_reaplist(nn, &reaplist, <); + nfs4_process_client_reaplist(&reaplist); + + nfs40_clean_admin_revoked(nn, <); + + spin_lock(&nn->deleg_lock); + list_for_each_safe(pos, next, &nn->del_recall_lru) { + dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); + if (!state_expired(<, dp->dl_time)) + break; + refcount_inc(&dp->dl_stid.sc_count); + unhash_delegation_locked(dp, SC_STATUS_REVOKED); + list_add(&dp->dl_recall_lru, &reaplist); + } + spin_unlock(&nn->deleg_lock); + while (!list_empty(&reaplist)) { + dp = list_first_entry(&reaplist, struct nfs4_delegation, + dl_recall_lru); + list_del_init(&dp->dl_recall_lru); + revoke_delegation(dp); + } + + spin_lock(&nn->client_lock); + while (!list_empty(&nn->close_lru)) { + oo = list_first_entry(&nn->close_lru, struct nfs4_openowner, + oo_close_lru); + if (!state_expired(<, oo->oo_time)) + break; + list_del_init(&oo->oo_close_lru); + stp = oo->oo_last_closed_stid; + oo->oo_last_closed_stid = NULL; + spin_unlock(&nn->client_lock); + nfs4_put_stid(&stp->st_stid); + spin_lock(&nn->client_lock); + } + spin_unlock(&nn->client_lock); + + /* + * It's possible for a client to try and acquire an already held lock + * that is being held for a long time, and then lose interest in it. + * So, we clean out any un-revisited request after a lease period + * under the assumption that the client is no longer interested. + * + * RFC5661, sec. 9.6 states that the client must not rely on getting + * notifications and must continue to poll for locks, even when the + * server supports them. Thus this shouldn't lead to clients blocking + * indefinitely once the lock does become free. + */ + BUG_ON(!list_empty(&reaplist)); + spin_lock(&nn->blocked_locks_lock); + while (!list_empty(&nn->blocked_locks_lru)) { + nbl = list_first_entry(&nn->blocked_locks_lru, + struct nfsd4_blocked_lock, nbl_lru); + if (!state_expired(<, nbl->nbl_time)) + break; + list_move(&nbl->nbl_lru, &reaplist); + list_del_init(&nbl->nbl_list); + } + spin_unlock(&nn->blocked_locks_lock); + + while (!list_empty(&reaplist)) { + nbl = list_first_entry(&reaplist, + struct nfsd4_blocked_lock, nbl_lru); + list_del_init(&nbl->nbl_lru); + free_blocked_lock(nbl); + } +#ifdef CONFIG_NFSD_V4_2_INTER_SSC + /* service the server-to-server copy delayed unmount list */ + nfsd4_ssc_expire_umount(nn); +#endif + if (atomic_long_read(&num_delegations) >= max_delegations) + deleg_reaper(nn); +out: + return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT); +} + +static void laundromat_main(struct work_struct *); + +static void +laundromat_main(struct work_struct *laundry) +{ + time64_t t; + struct delayed_work *dwork = to_delayed_work(laundry); + struct nfsd_net *nn = container_of(dwork, struct nfsd_net, + laundromat_work); + + t = nfs4_laundromat(nn); + queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ); +} + +static void +courtesy_client_reaper(struct nfsd_net *nn) +{ + struct list_head reaplist; + + nfs4_get_courtesy_client_reaplist(nn, &reaplist); + nfs4_process_client_reaplist(&reaplist); +} + +static void +deleg_reaper(struct nfsd_net *nn) +{ + struct list_head *pos, *next; + struct nfs4_client *clp; + + spin_lock(&nn->client_lock); + list_for_each_safe(pos, next, &nn->client_lru) { + clp = list_entry(pos, struct nfs4_client, cl_lru); + + if (clp->cl_state != NFSD4_ACTIVE) + continue; + if (list_empty(&clp->cl_delegations)) + continue; + if (atomic_read(&clp->cl_delegs_in_recall)) + continue; + if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &clp->cl_ra->ra_cb.cb_flags)) + continue; + if (ktime_get_boottime_seconds() - clp->cl_ra_time < 5) + continue; + if (clp->cl_cb_state != NFSD4_CB_UP) + continue; + + /* release in nfsd4_cb_recall_any_release */ + kref_get(&clp->cl_nfsdfs.cl_ref); + clp->cl_ra_time = ktime_get_boottime_seconds(); + clp->cl_ra->ra_keep = 0; + clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG) | + BIT(RCA4_TYPE_MASK_WDATA_DLG); + trace_nfsd_cb_recall_any(clp->cl_ra); + nfsd4_run_cb(&clp->cl_ra->ra_cb); + } + spin_unlock(&nn->client_lock); +} + +static void +nfsd4_state_shrinker_worker(struct work_struct *work) +{ + struct nfsd_net *nn = container_of(work, struct nfsd_net, + nfsd_shrinker_work); + + courtesy_client_reaper(nn); + deleg_reaper(nn); +} + +static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp) +{ + if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle)) + return nfserr_bad_stateid; + return nfs_ok; +} + +static +__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags) +{ + __be32 status = nfserr_openmode; + + /* For lock stateid's, we test the parent open, not the lock: */ + if (stp->st_openstp) + stp = stp->st_openstp; + if ((flags & WR_STATE) && !access_permit_write(stp)) + goto out; + if ((flags & RD_STATE) && !access_permit_read(stp)) + goto out; + status = nfs_ok; +out: + return status; +} + +static inline __be32 +check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags) +{ + if (ONE_STATEID(stateid) && (flags & RD_STATE)) + return nfs_ok; + else if (opens_in_grace(net)) { + /* Answer in remaining cases depends on existence of + * conflicting state; so we must wait out the grace period. */ + return nfserr_grace; + } else if (flags & WR_STATE) + return nfs4_share_conflict(current_fh, + NFS4_SHARE_DENY_WRITE); + else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ + return nfs4_share_conflict(current_fh, + NFS4_SHARE_DENY_READ); +} + +static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session) +{ + /* + * When sessions are used the stateid generation number is ignored + * when it is zero. + */ + if (has_session && in->si_generation == 0) + return nfs_ok; + + if (in->si_generation == ref->si_generation) + return nfs_ok; + + /* If the client sends us a stateid from the future, it's buggy: */ + if (nfsd4_stateid_generation_after(in, ref)) + return nfserr_bad_stateid; + /* + * However, we could see a stateid from the past, even from a + * non-buggy client. For example, if the client sends a lock + * while some IO is outstanding, the lock may bump si_generation + * while the IO is still in flight. The client could avoid that + * situation by waiting for responses on all the IO requests, + * but better performance may result in retrying IO that + * receives an old_stateid error if requests are rarely + * reordered in flight: + */ + return nfserr_old_stateid; +} + +static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session) +{ + __be32 ret; + + spin_lock(&s->sc_lock); + ret = nfsd4_verify_open_stid(s); + if (ret == nfs_ok) + ret = check_stateid_generation(in, &s->sc_stateid, has_session); + spin_unlock(&s->sc_lock); + if (ret == nfserr_admin_revoked) + nfsd40_drop_revoked_stid(s->sc_client, + &s->sc_stateid); + return ret; +} + +static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols) +{ + if (ols->st_stateowner->so_is_open_owner && + !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED)) + return nfserr_bad_stateid; + return nfs_ok; +} + +static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) +{ + struct nfs4_stid *s; + __be32 status = nfserr_bad_stateid; + + if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) || + CLOSE_STATEID(stateid)) + return status; + spin_lock(&cl->cl_lock); + s = find_stateid_locked(cl, stateid); + if (!s) + goto out_unlock; + status = nfsd4_stid_check_stateid_generation(stateid, s, 1); + if (status) + goto out_unlock; + status = nfsd4_verify_open_stid(s); + if (status) + goto out_unlock; + + switch (s->sc_type) { + case SC_TYPE_DELEG: + status = nfs_ok; + break; + case SC_TYPE_OPEN: + case SC_TYPE_LOCK: + status = nfsd4_check_openowner_confirmed(openlockstateid(s)); + break; + default: + printk("unknown stateid type %x\n", s->sc_type); + status = nfserr_bad_stateid; + } +out_unlock: + spin_unlock(&cl->cl_lock); + if (status == nfserr_admin_revoked) + nfsd40_drop_revoked_stid(cl, stateid); + return status; +} + +__be32 +nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, + stateid_t *stateid, + unsigned short typemask, unsigned short statusmask, + struct nfs4_stid **s, struct nfsd_net *nn) +{ + __be32 status; + struct nfs4_stid *stid; + bool return_revoked = false; + + /* + * only return revoked delegations if explicitly asked. + * otherwise we report revoked or bad_stateid status. + */ + if (statusmask & SC_STATUS_REVOKED) + return_revoked = true; + if (typemask & SC_TYPE_DELEG) + /* Always allow REVOKED for DELEG so we can + * return the appropriate error. + */ + statusmask |= SC_STATUS_REVOKED; + + statusmask |= SC_STATUS_ADMIN_REVOKED | SC_STATUS_FREEABLE; + + if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) || + CLOSE_STATEID(stateid)) + return nfserr_bad_stateid; + status = set_client(&stateid->si_opaque.so_clid, cstate, nn); + if (status == nfserr_stale_clientid) { + if (cstate->session) + return nfserr_bad_stateid; + return nfserr_stale_stateid; + } + if (status) + return status; + stid = find_stateid_by_type(cstate->clp, stateid, typemask, statusmask); + if (!stid) + return nfserr_bad_stateid; + if ((stid->sc_status & SC_STATUS_REVOKED) && !return_revoked) { + nfs4_put_stid(stid); + return nfserr_deleg_revoked; + } + if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) { + nfsd40_drop_revoked_stid(cstate->clp, stateid); + nfs4_put_stid(stid); + return nfserr_admin_revoked; + } + *s = stid; + return nfs_ok; +} + +static struct nfsd_file * +nfs4_find_file(struct nfs4_stid *s, int flags) +{ + struct nfsd_file *ret = NULL; + + if (!s || s->sc_status) + return NULL; + + switch (s->sc_type) { + case SC_TYPE_DELEG: + case SC_TYPE_OPEN: + case SC_TYPE_LOCK: + if (flags & RD_STATE) + ret = find_readable_file(s->sc_file); + else + ret = find_writeable_file(s->sc_file); + } + + return ret; +} + +static __be32 +nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags) +{ + __be32 status; + + status = nfsd4_check_openowner_confirmed(ols); + if (status) + return status; + return nfs4_check_openmode(ols, flags); +} + +static __be32 +nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s, + struct nfsd_file **nfp, int flags) +{ + int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE; + struct nfsd_file *nf; + __be32 status; + + nf = nfs4_find_file(s, flags); + if (nf) { + status = nfsd_permission(&rqstp->rq_cred, + fhp->fh_export, fhp->fh_dentry, + acc | NFSD_MAY_OWNER_OVERRIDE); + if (status) { + nfsd_file_put(nf); + goto out; + } + } else { + status = nfsd_file_acquire(rqstp, fhp, acc, &nf); + if (status) + return status; + } + *nfp = nf; +out: + return status; +} +static void +_free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps) +{ + WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID); + if (!refcount_dec_and_test(&cps->cp_stateid.cs_count)) + return; + list_del(&cps->cp_list); + idr_remove(&nn->s2s_cp_stateids, + cps->cp_stateid.cs_stid.si_opaque.so_id); + kfree(cps); +} +/* + * A READ from an inter server to server COPY will have a + * copy stateid. Look up the copy notify stateid from the + * idr structure and take a reference on it. + */ +__be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st, + struct nfs4_client *clp, + struct nfs4_cpntf_state **cps) +{ + copy_stateid_t *cps_t; + struct nfs4_cpntf_state *state = NULL; + + if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id) + return nfserr_bad_stateid; + spin_lock(&nn->s2s_cp_lock); + cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id); + if (cps_t) { + state = container_of(cps_t, struct nfs4_cpntf_state, + cp_stateid); + if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) { + state = NULL; + goto unlock; + } + if (!clp) + refcount_inc(&state->cp_stateid.cs_count); + else + _free_cpntf_state_locked(nn, state); + } +unlock: + spin_unlock(&nn->s2s_cp_lock); + if (!state) + return nfserr_bad_stateid; + if (!clp) + *cps = state; + return 0; +} + +static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st, + struct nfs4_stid **stid) +{ + __be32 status; + struct nfs4_cpntf_state *cps = NULL; + struct nfs4_client *found; + + status = manage_cpntf_state(nn, st, NULL, &cps); + if (status) + return status; + + cps->cpntf_time = ktime_get_boottime_seconds(); + + status = nfserr_expired; + found = lookup_clientid(&cps->cp_p_clid, true, nn); + if (!found) + goto out; + + *stid = find_stateid_by_type(found, &cps->cp_p_stateid, + SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK, + 0); + if (*stid) + status = nfs_ok; + else + status = nfserr_bad_stateid; + + put_client_renew(found); +out: + nfs4_put_cpntf_state(nn, cps); + return status; +} + +void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps) +{ + spin_lock(&nn->s2s_cp_lock); + _free_cpntf_state_locked(nn, cps); + spin_unlock(&nn->s2s_cp_lock); +} + +/** + * nfs4_preprocess_stateid_op - find and prep stateid for an operation + * @rqstp: incoming request from client + * @cstate: current compound state + * @fhp: filehandle associated with requested stateid + * @stateid: stateid (provided by client) + * @flags: flags describing type of operation to be done + * @nfp: optional nfsd_file return pointer (may be NULL) + * @cstid: optional returned nfs4_stid pointer (may be NULL) + * + * Given info from the client, look up a nfs4_stid for the operation. On + * success, it returns a reference to the nfs4_stid and/or the nfsd_file + * associated with it. + */ +__be32 +nfs4_preprocess_stateid_op(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, struct svc_fh *fhp, + stateid_t *stateid, int flags, struct nfsd_file **nfp, + struct nfs4_stid **cstid) +{ + struct net *net = SVC_NET(rqstp); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + struct nfs4_stid *s = NULL; + __be32 status; + + if (nfp) + *nfp = NULL; + + if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { + status = check_special_stateids(net, fhp, stateid, flags); + goto done; + } + + status = nfsd4_lookup_stateid(cstate, stateid, + SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK, + 0, &s, nn); + if (status == nfserr_bad_stateid) + status = find_cpntf_state(nn, stateid, &s); + if (status) + return status; + status = nfsd4_stid_check_stateid_generation(stateid, s, + nfsd4_has_session(cstate)); + if (status) + goto out; + + switch (s->sc_type) { + case SC_TYPE_DELEG: + status = nfs4_check_delegmode(delegstateid(s), flags); + break; + case SC_TYPE_OPEN: + case SC_TYPE_LOCK: + status = nfs4_check_olstateid(openlockstateid(s), flags); + break; + } + if (status) + goto out; + status = nfs4_check_fh(fhp, s); + +done: + if (status == nfs_ok && nfp) + status = nfs4_check_file(rqstp, fhp, s, nfp, flags); +out: + if (s) { + if (!status && cstid) + *cstid = s; + else + nfs4_put_stid(s); + } + return status; +} + +/* + * Test if the stateid is valid + */ +__be32 +nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_test_stateid *test_stateid = &u->test_stateid; + struct nfsd4_test_stateid_id *stateid; + struct nfs4_client *cl = cstate->clp; + + list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list) + stateid->ts_id_status = + nfsd4_validate_stateid(cl, &stateid->ts_id_stateid); + + return nfs_ok; +} + +static __be32 +nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s) +{ + struct nfs4_ol_stateid *stp = openlockstateid(s); + __be32 ret; + + ret = nfsd4_lock_ol_stateid(stp); + if (ret) + goto out_put_stid; + + ret = check_stateid_generation(stateid, &s->sc_stateid, 1); + if (ret) + goto out; + + ret = nfserr_locks_held; + if (check_for_locks(stp->st_stid.sc_file, + lockowner(stp->st_stateowner))) + goto out; + + release_lock_stateid(stp); + ret = nfs_ok; + +out: + mutex_unlock(&stp->st_mutex); +out_put_stid: + nfs4_put_stid(s); + return ret; +} + +__be32 +nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_free_stateid *free_stateid = &u->free_stateid; + stateid_t *stateid = &free_stateid->fr_stateid; + struct nfs4_stid *s; + struct nfs4_delegation *dp; + struct nfs4_client *cl = cstate->clp; + __be32 ret = nfserr_bad_stateid; + + spin_lock(&cl->cl_lock); + s = find_stateid_locked(cl, stateid); + if (!s || s->sc_status & SC_STATUS_CLOSED) + goto out_unlock; + if (s->sc_status & SC_STATUS_ADMIN_REVOKED) { + nfsd4_drop_revoked_stid(s); + ret = nfs_ok; + goto out; + } + spin_lock(&s->sc_lock); + switch (s->sc_type) { + case SC_TYPE_DELEG: + if (s->sc_status & SC_STATUS_REVOKED) { + s->sc_status |= SC_STATUS_CLOSED; + spin_unlock(&s->sc_lock); + dp = delegstateid(s); + if (s->sc_status & SC_STATUS_FREEABLE) + list_del_init(&dp->dl_recall_lru); + s->sc_status |= SC_STATUS_FREED; + spin_unlock(&cl->cl_lock); + nfs4_put_stid(s); + ret = nfs_ok; + goto out; + } + ret = nfserr_locks_held; + break; + case SC_TYPE_OPEN: + ret = check_stateid_generation(stateid, &s->sc_stateid, 1); + if (ret) + break; + ret = nfserr_locks_held; + break; + case SC_TYPE_LOCK: + spin_unlock(&s->sc_lock); + refcount_inc(&s->sc_count); + spin_unlock(&cl->cl_lock); + ret = nfsd4_free_lock_stateid(stateid, s); + goto out; + } + spin_unlock(&s->sc_lock); +out_unlock: + spin_unlock(&cl->cl_lock); +out: + return ret; +} + +static inline int +setlkflg (int type) +{ + return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? + RD_STATE : WR_STATE; +} + +static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp) +{ + struct svc_fh *current_fh = &cstate->current_fh; + struct nfs4_stateowner *sop = stp->st_stateowner; + __be32 status; + + status = nfsd4_check_seqid(cstate, sop, seqid); + if (status) + return status; + status = nfsd4_lock_ol_stateid(stp); + if (status != nfs_ok) + return status; + status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate)); + if (status == nfs_ok) + status = nfs4_check_fh(current_fh, &stp->st_stid); + if (status != nfs_ok) + mutex_unlock(&stp->st_mutex); + return status; +} + +/** + * nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op + * @cstate: compund state + * @seqid: seqid (provided by client) + * @stateid: stateid (provided by client) + * @typemask: mask of allowable types for this operation + * @statusmask: mask of allowed states: 0 or STID_CLOSED + * @stpp: return pointer for the stateid found + * @nn: net namespace for request + * + * Given a stateid+seqid from a client, look up an nfs4_ol_stateid and + * return it in @stpp. On a nfs_ok return, the returned stateid will + * have its st_mutex locked. + */ +static __be32 +nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, + stateid_t *stateid, + unsigned short typemask, unsigned short statusmask, + struct nfs4_ol_stateid **stpp, + struct nfsd_net *nn) +{ + __be32 status; + struct nfs4_stid *s; + struct nfs4_ol_stateid *stp = NULL; + + trace_nfsd_preprocess(seqid, stateid); + + *stpp = NULL; +retry: + status = nfsd4_lookup_stateid(cstate, stateid, + typemask, statusmask, &s, nn); + if (status) + return status; + stp = openlockstateid(s); + if (nfsd4_cstate_assign_replay(cstate, stp->st_stateowner) == -EAGAIN) { + nfs4_put_stateowner(stp->st_stateowner); + goto retry; + } + + status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp); + if (!status) + *stpp = stp; + else + nfs4_put_stid(&stp->st_stid); + return status; +} + +static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, + stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn) +{ + __be32 status; + struct nfs4_openowner *oo; + struct nfs4_ol_stateid *stp; + + status = nfs4_preprocess_seqid_op(cstate, seqid, stateid, + SC_TYPE_OPEN, 0, &stp, nn); + if (status) + return status; + oo = openowner(stp->st_stateowner); + if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { + mutex_unlock(&stp->st_mutex); + nfs4_put_stid(&stp->st_stid); + return nfserr_bad_stateid; + } + *stpp = stp; + return nfs_ok; +} + +__be32 +nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_open_confirm *oc = &u->open_confirm; + __be32 status; + struct nfs4_openowner *oo; + struct nfs4_ol_stateid *stp; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + dprintk("NFSD: nfsd4_open_confirm on file %pd\n", + cstate->current_fh.fh_dentry); + + status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); + if (status) + return status; + + status = nfs4_preprocess_seqid_op(cstate, + oc->oc_seqid, &oc->oc_req_stateid, + SC_TYPE_OPEN, 0, &stp, nn); + if (status) + goto out; + oo = openowner(stp->st_stateowner); + status = nfserr_bad_stateid; + if (oo->oo_flags & NFS4_OO_CONFIRMED) { + mutex_unlock(&stp->st_mutex); + goto put_stateid; + } + oo->oo_flags |= NFS4_OO_CONFIRMED; + nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid); + mutex_unlock(&stp->st_mutex); + trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid); + nfsd4_client_record_create(oo->oo_owner.so_client); + status = nfs_ok; +put_stateid: + nfs4_put_stid(&stp->st_stid); +out: + nfsd4_bump_seqid(cstate, status); + return status; +} + +static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access) +{ + if (!test_access(access, stp)) + return; + nfs4_file_put_access(stp->st_stid.sc_file, access); + clear_access(access, stp); +} + +static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access) +{ + switch (to_access) { + case NFS4_SHARE_ACCESS_READ: + nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE); + nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); + break; + case NFS4_SHARE_ACCESS_WRITE: + nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ); + nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); + break; + case NFS4_SHARE_ACCESS_BOTH: + break; + default: + WARN_ON_ONCE(1); + } +} + +__be32 +nfsd4_open_downgrade(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) +{ + struct nfsd4_open_downgrade *od = &u->open_downgrade; + __be32 status; + struct nfs4_ol_stateid *stp; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", + cstate->current_fh.fh_dentry); + + /* We don't yet support WANT bits: */ + if (od->od_deleg_want) + dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__, + od->od_deleg_want); + + status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid, + &od->od_stateid, &stp, nn); + if (status) + goto out; + status = nfserr_inval; + if (!test_access(od->od_share_access, stp)) { + dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n", + stp->st_access_bmap, od->od_share_access); + goto put_stateid; + } + if (!test_deny(od->od_share_deny, stp)) { + dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n", + stp->st_deny_bmap, od->od_share_deny); + goto put_stateid; + } + nfs4_stateid_downgrade(stp, od->od_share_access); + reset_union_bmap_deny(od->od_share_deny, stp); + nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid); + status = nfs_ok; +put_stateid: + mutex_unlock(&stp->st_mutex); + nfs4_put_stid(&stp->st_stid); +out: + nfsd4_bump_seqid(cstate, status); + return status; +} + +static bool nfsd4_close_open_stateid(struct nfs4_ol_stateid *s) +{ + struct nfs4_client *clp = s->st_stid.sc_client; + bool unhashed; + LIST_HEAD(reaplist); + struct nfs4_ol_stateid *stp; + + spin_lock(&clp->cl_lock); + unhashed = unhash_open_stateid(s, &reaplist); + + if (clp->cl_minorversion) { + if (unhashed) + put_ol_stateid_locked(s, &reaplist); + spin_unlock(&clp->cl_lock); + list_for_each_entry(stp, &reaplist, st_locks) + nfs4_free_cpntf_statelist(clp->net, &stp->st_stid); + free_ol_stateid_reaplist(&reaplist); + return false; + } else { + spin_unlock(&clp->cl_lock); + free_ol_stateid_reaplist(&reaplist); + return unhashed; + } +} + +/* + * nfs4_unlock_state() called after encode + */ +__be32 +nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_close *close = &u->close; + __be32 status; + struct nfs4_ol_stateid *stp; + struct net *net = SVC_NET(rqstp); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + bool need_move_to_close_list; + + dprintk("NFSD: nfsd4_close on file %pd\n", + cstate->current_fh.fh_dentry); + + status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid, + &close->cl_stateid, + SC_TYPE_OPEN, SC_STATUS_CLOSED, + &stp, nn); + nfsd4_bump_seqid(cstate, status); + if (status) + goto out; + + spin_lock(&stp->st_stid.sc_client->cl_lock); + stp->st_stid.sc_status |= SC_STATUS_CLOSED; + spin_unlock(&stp->st_stid.sc_client->cl_lock); + + /* + * Technically we don't _really_ have to increment or copy it, since + * it should just be gone after this operation and we clobber the + * copied value below, but we continue to do so here just to ensure + * that racing ops see that there was a state change. + */ + nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid); + + need_move_to_close_list = nfsd4_close_open_stateid(stp); + mutex_unlock(&stp->st_mutex); + if (need_move_to_close_list) + move_to_close_lru(stp, net); + + /* v4.1+ suggests that we send a special stateid in here, since the + * clients should just ignore this anyway. Since this is not useful + * for v4.0 clients either, we set it to the special close_stateid + * universally. + * + * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5 + */ + memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid)); + + /* put reference from nfs4_preprocess_seqid_op */ + nfs4_put_stid(&stp->st_stid); +out: + return status; +} + +__be32 +nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_delegreturn *dr = &u->delegreturn; + struct nfs4_delegation *dp; + stateid_t *stateid = &dr->dr_stateid; + struct nfs4_stid *s; + __be32 status; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + status = fh_verify(rqstp, &cstate->current_fh, 0, 0); + if (status) + return status; + + status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG, SC_STATUS_REVOKED, &s, nn); + if (status) + goto out; + dp = delegstateid(s); + status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate)); + if (status) + goto put_stateid; + + trace_nfsd_deleg_return(stateid); + destroy_delegation(dp); + smp_mb__after_atomic(); + wake_up_var(d_inode(cstate->current_fh.fh_dentry)); +put_stateid: + nfs4_put_stid(&dp->dl_stid); +out: + return status; +} + +/* last octet in a range */ +static inline u64 +last_byte_offset(u64 start, u64 len) +{ + u64 end; + + WARN_ON_ONCE(!len); + end = start + len; + return end > start ? end - 1: NFS4_MAX_UINT64; +} + +/* + * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that + * we can't properly handle lock requests that go beyond the (2^63 - 1)-th + * byte, because of sign extension problems. Since NFSv4 calls for 64-bit + * locking, this prevents us from being completely protocol-compliant. The + * real solution to this problem is to start using unsigned file offsets in + * the VFS, but this is a very deep change! + */ +static inline void +nfs4_transform_lock_offset(struct file_lock *lock) +{ + if (lock->fl_start < 0) + lock->fl_start = OFFSET_MAX; + if (lock->fl_end < 0) + lock->fl_end = OFFSET_MAX; +} + +static fl_owner_t +nfsd4_lm_get_owner(fl_owner_t owner) +{ + struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; + + nfs4_get_stateowner(&lo->lo_owner); + return owner; +} + +static void +nfsd4_lm_put_owner(fl_owner_t owner) +{ + struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; + + if (lo) + nfs4_put_stateowner(&lo->lo_owner); +} + +/* return pointer to struct nfs4_client if client is expirable */ +static bool +nfsd4_lm_lock_expirable(struct file_lock *cfl) +{ + struct nfs4_lockowner *lo = (struct nfs4_lockowner *) cfl->c.flc_owner; + struct nfs4_client *clp = lo->lo_owner.so_client; + struct nfsd_net *nn; + + if (try_to_expire_client(clp)) { + nn = net_generic(clp->net, nfsd_net_id); + mod_delayed_work(laundry_wq, &nn->laundromat_work, 0); + return true; + } + return false; +} + +/* schedule laundromat to run immediately and wait for it to complete */ +static void +nfsd4_lm_expire_lock(void) +{ + flush_workqueue(laundry_wq); +} + +static void +nfsd4_lm_notify(struct file_lock *fl) +{ + struct nfs4_lockowner *lo = (struct nfs4_lockowner *) fl->c.flc_owner; + struct net *net = lo->lo_owner.so_client->net; + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + struct nfsd4_blocked_lock *nbl = container_of(fl, + struct nfsd4_blocked_lock, nbl_lock); + bool queue = false; + + /* An empty list means that something else is going to be using it */ + spin_lock(&nn->blocked_locks_lock); + if (!list_empty(&nbl->nbl_list)) { + list_del_init(&nbl->nbl_list); + list_del_init(&nbl->nbl_lru); + queue = true; + } + spin_unlock(&nn->blocked_locks_lock); + + if (queue) { + trace_nfsd_cb_notify_lock(lo, nbl); + nfsd4_try_run_cb(&nbl->nbl_cb); + } +} + +static const struct lock_manager_operations nfsd_posix_mng_ops = { + .lm_mod_owner = THIS_MODULE, + .lm_notify = nfsd4_lm_notify, + .lm_get_owner = nfsd4_lm_get_owner, + .lm_put_owner = nfsd4_lm_put_owner, + .lm_lock_expirable = nfsd4_lm_lock_expirable, + .lm_expire_lock = nfsd4_lm_expire_lock, +}; + +static inline void +nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) +{ + struct nfs4_lockowner *lo; + + if (fl->fl_lmops == &nfsd_posix_mng_ops) { + lo = (struct nfs4_lockowner *) fl->c.flc_owner; + xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner, + GFP_KERNEL); + if (!deny->ld_owner.data) + /* We just don't care that much */ + goto nevermind; + deny->ld_clientid = lo->lo_owner.so_client->cl_clientid; + } else { +nevermind: + deny->ld_owner.len = 0; + deny->ld_owner.data = NULL; + deny->ld_clientid.cl_boot = 0; + deny->ld_clientid.cl_id = 0; + } + deny->ld_start = fl->fl_start; + deny->ld_length = NFS4_MAX_UINT64; + if (fl->fl_end != NFS4_MAX_UINT64) + deny->ld_length = fl->fl_end - fl->fl_start + 1; + deny->ld_type = NFS4_READ_LT; + if (fl->c.flc_type != F_RDLCK) + deny->ld_type = NFS4_WRITE_LT; +} + +static struct nfs4_lockowner * +find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner) +{ + unsigned int strhashval = ownerstr_hashval(owner); + struct nfs4_stateowner *so; + + lockdep_assert_held(&clp->cl_lock); + + list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval], + so_strhash) { + if (so->so_is_open_owner) + continue; + if (same_owner_str(so, owner)) + return lockowner(nfs4_get_stateowner(so)); + } + return NULL; +} + +static struct nfs4_lockowner * +find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner) +{ + struct nfs4_lockowner *lo; + + spin_lock(&clp->cl_lock); + lo = find_lockowner_str_locked(clp, owner); + spin_unlock(&clp->cl_lock); + return lo; +} + +static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop) +{ + unhash_lockowner_locked(lockowner(sop)); +} + +static void nfs4_free_lockowner(struct nfs4_stateowner *sop) +{ + struct nfs4_lockowner *lo = lockowner(sop); + + kmem_cache_free(lockowner_slab, lo); +} + +static const struct nfs4_stateowner_operations lockowner_ops = { + .so_unhash = nfs4_unhash_lockowner, + .so_free = nfs4_free_lockowner, +}; + +/* + * Alloc a lock owner structure. + * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has + * occurred. + * + * strhashval = ownerstr_hashval + */ +static struct nfs4_lockowner * +alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, + struct nfs4_ol_stateid *open_stp, + struct nfsd4_lock *lock) +{ + struct nfs4_lockowner *lo, *ret; + + lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp); + if (!lo) + return NULL; + INIT_LIST_HEAD(&lo->lo_blocked); + INIT_LIST_HEAD(&lo->lo_owner.so_stateids); + lo->lo_owner.so_is_open_owner = 0; + lo->lo_owner.so_seqid = lock->lk_new_lock_seqid; + lo->lo_owner.so_ops = &lockowner_ops; + spin_lock(&clp->cl_lock); + ret = find_lockowner_str_locked(clp, &lock->lk_new_owner); + if (ret == NULL) { + list_add(&lo->lo_owner.so_strhash, + &clp->cl_ownerstr_hashtbl[strhashval]); + ret = lo; + } else + nfs4_free_stateowner(&lo->lo_owner); + + spin_unlock(&clp->cl_lock); + return ret; +} + +static struct nfs4_ol_stateid * +find_lock_stateid(const struct nfs4_lockowner *lo, + const struct nfs4_ol_stateid *ost) +{ + struct nfs4_ol_stateid *lst; + + lockdep_assert_held(&ost->st_stid.sc_client->cl_lock); + + /* If ost is not hashed, ost->st_locks will not be valid */ + if (!nfs4_ol_stateid_unhashed(ost)) + list_for_each_entry(lst, &ost->st_locks, st_locks) { + if (lst->st_stateowner == &lo->lo_owner) { + refcount_inc(&lst->st_stid.sc_count); + return lst; + } + } + return NULL; +} + +static struct nfs4_ol_stateid * +init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo, + struct nfs4_file *fp, struct inode *inode, + struct nfs4_ol_stateid *open_stp) +{ + struct nfs4_client *clp = lo->lo_owner.so_client; + struct nfs4_ol_stateid *retstp; + + mutex_init(&stp->st_mutex); + mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX); +retry: + spin_lock(&clp->cl_lock); + if (nfs4_ol_stateid_unhashed(open_stp)) + goto out_close; + retstp = find_lock_stateid(lo, open_stp); + if (retstp) + goto out_found; + refcount_inc(&stp->st_stid.sc_count); + stp->st_stid.sc_type = SC_TYPE_LOCK; + stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner); + get_nfs4_file(fp); + stp->st_stid.sc_file = fp; + if (open_stp->st_stid.sc_export) + stp->st_stid.sc_export = + exp_get(open_stp->st_stid.sc_export); + stp->st_access_bmap = 0; + stp->st_deny_bmap = open_stp->st_deny_bmap; + stp->st_openstp = open_stp; + spin_lock(&fp->fi_lock); + list_add(&stp->st_locks, &open_stp->st_locks); + list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids); + list_add(&stp->st_perfile, &fp->fi_stateids); + spin_unlock(&fp->fi_lock); + spin_unlock(&clp->cl_lock); + return stp; +out_found: + spin_unlock(&clp->cl_lock); + if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) { + nfs4_put_stid(&retstp->st_stid); + goto retry; + } + /* To keep mutex tracking happy */ + mutex_unlock(&stp->st_mutex); + return retstp; +out_close: + spin_unlock(&clp->cl_lock); + mutex_unlock(&stp->st_mutex); + return NULL; +} + +static struct nfs4_ol_stateid * +find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi, + struct inode *inode, struct nfs4_ol_stateid *ost, + bool *new) +{ + struct nfs4_stid *ns = NULL; + struct nfs4_ol_stateid *lst; + struct nfs4_openowner *oo = openowner(ost->st_stateowner); + struct nfs4_client *clp = oo->oo_owner.so_client; + + *new = false; + spin_lock(&clp->cl_lock); + lst = find_lock_stateid(lo, ost); + spin_unlock(&clp->cl_lock); + if (lst != NULL) { + if (nfsd4_lock_ol_stateid(lst) == nfs_ok) + goto out; + nfs4_put_stid(&lst->st_stid); + } + ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid); + if (ns == NULL) + return NULL; + + lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost); + if (lst == openlockstateid(ns)) + *new = true; + else + nfs4_put_stid(ns); +out: + return lst; +} + +static int +check_lock_length(u64 offset, u64 length) +{ + return ((length == 0) || ((length != NFS4_MAX_UINT64) && + (length > ~offset))); +} + +static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access) +{ + struct nfs4_file *fp = lock_stp->st_stid.sc_file; + + lockdep_assert_held(&fp->fi_lock); + + if (test_access(access, lock_stp)) + return; + __nfs4_file_get_access(fp, access); + set_access(access, lock_stp); +} + +static __be32 +lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, + struct nfs4_ol_stateid *ost, + struct nfsd4_lock *lock, + struct nfs4_ol_stateid **plst, bool *new) +{ + __be32 status; + struct nfs4_file *fi = ost->st_stid.sc_file; + struct nfs4_openowner *oo = openowner(ost->st_stateowner); + struct nfs4_client *cl = oo->oo_owner.so_client; + struct inode *inode = d_inode(cstate->current_fh.fh_dentry); + struct nfs4_lockowner *lo; + struct nfs4_ol_stateid *lst; + unsigned int strhashval; + + lo = find_lockowner_str(cl, &lock->lk_new_owner); + if (!lo) { + strhashval = ownerstr_hashval(&lock->lk_new_owner); + lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock); + if (lo == NULL) + return nfserr_jukebox; + } else { + /* with an existing lockowner, seqids must be the same */ + status = nfserr_bad_seqid; + if (!cstate->minorversion && + lock->lk_new_lock_seqid != lo->lo_owner.so_seqid) + goto out; + } + + lst = find_or_create_lock_stateid(lo, fi, inode, ost, new); + if (lst == NULL) { + status = nfserr_jukebox; + goto out; + } + + status = nfs_ok; + *plst = lst; +out: + nfs4_put_stateowner(&lo->lo_owner); + return status; +} + +/* + * LOCK operation + */ +__be32 +nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_lock *lock = &u->lock; + struct nfs4_openowner *open_sop = NULL; + struct nfs4_lockowner *lock_sop = NULL; + struct nfs4_ol_stateid *lock_stp = NULL; + struct nfs4_ol_stateid *open_stp = NULL; + struct nfs4_file *fp; + struct nfsd_file *nf = NULL; + struct nfsd4_blocked_lock *nbl = NULL; + struct file_lock *file_lock = NULL; + struct file_lock *conflock = NULL; + __be32 status = 0; + int lkflg; + int err; + bool new = false; + unsigned char type; + unsigned int flags = FL_POSIX; + struct net *net = SVC_NET(rqstp); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", + (long long) lock->lk_offset, + (long long) lock->lk_length); + + if (check_lock_length(lock->lk_offset, lock->lk_length)) + return nfserr_inval; + + status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); + if (status != nfs_ok) + return status; + if (exportfs_cannot_lock(cstate->current_fh.fh_dentry->d_sb->s_export_op)) { + status = nfserr_notsupp; + goto out; + } + + if (lock->lk_is_new) { + if (nfsd4_has_session(cstate)) + /* See rfc 5661 18.10.3: given clientid is ignored: */ + memcpy(&lock->lk_new_clientid, + &cstate->clp->cl_clientid, + sizeof(clientid_t)); + + /* validate and update open stateid and open seqid */ + status = nfs4_preprocess_confirmed_seqid_op(cstate, + lock->lk_new_open_seqid, + &lock->lk_new_open_stateid, + &open_stp, nn); + if (status) + goto out; + mutex_unlock(&open_stp->st_mutex); + open_sop = openowner(open_stp->st_stateowner); + status = nfserr_bad_stateid; + if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid, + &lock->lk_new_clientid)) + goto out; + status = lookup_or_create_lock_state(cstate, open_stp, lock, + &lock_stp, &new); + } else { + status = nfs4_preprocess_seqid_op(cstate, + lock->lk_old_lock_seqid, + &lock->lk_old_lock_stateid, + SC_TYPE_LOCK, 0, &lock_stp, + nn); + } + if (status) + goto out; + lock_sop = lockowner(lock_stp->st_stateowner); + + lkflg = setlkflg(lock->lk_type); + status = nfs4_check_openmode(lock_stp, lkflg); + if (status) + goto out; + + status = nfserr_grace; + if (locks_in_grace(net) && !lock->lk_reclaim) + goto out; + status = nfserr_no_grace; + if (!locks_in_grace(net) && lock->lk_reclaim) + goto out; + + if (lock->lk_reclaim) + flags |= FL_RECLAIM; + + fp = lock_stp->st_stid.sc_file; + switch (lock->lk_type) { + case NFS4_READW_LT: + fallthrough; + case NFS4_READ_LT: + spin_lock(&fp->fi_lock); + nf = find_readable_file_locked(fp); + if (nf) + get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ); + spin_unlock(&fp->fi_lock); + type = F_RDLCK; + break; + case NFS4_WRITEW_LT: + fallthrough; + case NFS4_WRITE_LT: + spin_lock(&fp->fi_lock); + nf = find_writeable_file_locked(fp); + if (nf) + get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE); + spin_unlock(&fp->fi_lock); + type = F_WRLCK; + break; + default: + status = nfserr_inval; + goto out; + } + + if (!nf) { + status = nfserr_openmode; + goto out; + } + + if (lock->lk_type & (NFS4_READW_LT | NFS4_WRITEW_LT) && + nfsd4_has_session(cstate) && + locks_can_async_lock(nf->nf_file->f_op)) + flags |= FL_SLEEP; + + nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn); + if (!nbl) { + dprintk("NFSD: %s: unable to allocate block!\n", __func__); + status = nfserr_jukebox; + goto out; + } + + file_lock = &nbl->nbl_lock; + file_lock->c.flc_type = type; + file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner)); + file_lock->c.flc_pid = current->tgid; + file_lock->c.flc_file = nf->nf_file; + file_lock->c.flc_flags = flags; + file_lock->fl_lmops = &nfsd_posix_mng_ops; + file_lock->fl_start = lock->lk_offset; + file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); + nfs4_transform_lock_offset(file_lock); + + conflock = locks_alloc_lock(); + if (!conflock) { + dprintk("NFSD: %s: unable to allocate lock!\n", __func__); + status = nfserr_jukebox; + goto out; + } + + if (flags & FL_SLEEP) { + nbl->nbl_time = ktime_get_boottime_seconds(); + spin_lock(&nn->blocked_locks_lock); + list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked); + list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru); + kref_get(&nbl->nbl_kref); + spin_unlock(&nn->blocked_locks_lock); + } + + err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock); + switch (err) { + case 0: /* success! */ + nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid); + status = 0; + if (lock->lk_reclaim) + nn->somebody_reclaimed = true; + break; + case FILE_LOCK_DEFERRED: + kref_put(&nbl->nbl_kref, free_nbl); + nbl = NULL; + fallthrough; + case -EAGAIN: /* conflock holds conflicting lock */ + status = nfserr_denied; + dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); + nfs4_set_lock_denied(conflock, &lock->lk_denied); + break; + case -EDEADLK: + status = nfserr_deadlock; + break; + default: + dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); + status = nfserrno(err); + break; + } +out: + if (nbl) { + /* dequeue it if we queued it before */ + if (flags & FL_SLEEP) { + spin_lock(&nn->blocked_locks_lock); + if (!list_empty(&nbl->nbl_list) && + !list_empty(&nbl->nbl_lru)) { + list_del_init(&nbl->nbl_list); + list_del_init(&nbl->nbl_lru); + kref_put(&nbl->nbl_kref, free_nbl); + } + /* nbl can use one of lists to be linked to reaplist */ + spin_unlock(&nn->blocked_locks_lock); + } + free_blocked_lock(nbl); + } + if (nf) + nfsd_file_put(nf); + if (lock_stp) { + /* Bump seqid manually if the 4.0 replay owner is openowner */ + if (cstate->replay_owner && + cstate->replay_owner != &lock_sop->lo_owner && + seqid_mutating_err(ntohl(status))) + lock_sop->lo_owner.so_seqid++; + + /* + * If this is a new, never-before-used stateid, and we are + * returning an error, then just go ahead and release it. + */ + if (status && new) + release_lock_stateid(lock_stp); + + mutex_unlock(&lock_stp->st_mutex); + + nfs4_put_stid(&lock_stp->st_stid); + } + if (open_stp) + nfs4_put_stid(&open_stp->st_stid); + nfsd4_bump_seqid(cstate, status); + if (conflock) + locks_free_lock(conflock); + return status; +} + +void nfsd4_lock_release(union nfsd4_op_u *u) +{ + struct nfsd4_lock *lock = &u->lock; + struct nfsd4_lock_denied *deny = &lock->lk_denied; + + kfree(deny->ld_owner.data); +} + +/* + * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, + * so we do a temporary open here just to get an open file to pass to + * vfs_test_lock. + */ +static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) +{ + struct nfsd_file *nf; + struct inode *inode; + __be32 err; + + err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf); + if (err) + return err; + inode = fhp->fh_dentry->d_inode; + inode_lock(inode); /* to block new leases till after test_lock: */ + err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ)); + if (err) + goto out; + lock->c.flc_file = nf->nf_file; + err = nfserrno(vfs_test_lock(nf->nf_file, lock)); + lock->c.flc_file = NULL; +out: + inode_unlock(inode); + nfsd_file_put(nf); + return err; +} + +/* + * LOCKT operation + */ +__be32 +nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_lockt *lockt = &u->lockt; + struct file_lock *file_lock = NULL; + struct nfs4_lockowner *lo = NULL; + __be32 status; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + if (locks_in_grace(SVC_NET(rqstp))) + return nfserr_grace; + + if (check_lock_length(lockt->lt_offset, lockt->lt_length)) + return nfserr_inval; + + if (!nfsd4_has_session(cstate)) { + status = set_client(&lockt->lt_clientid, cstate, nn); + if (status) + goto out; + } + + if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) + goto out; + + file_lock = locks_alloc_lock(); + if (!file_lock) { + dprintk("NFSD: %s: unable to allocate lock!\n", __func__); + status = nfserr_jukebox; + goto out; + } + + switch (lockt->lt_type) { + case NFS4_READ_LT: + case NFS4_READW_LT: + file_lock->c.flc_type = F_RDLCK; + break; + case NFS4_WRITE_LT: + case NFS4_WRITEW_LT: + file_lock->c.flc_type = F_WRLCK; + break; + default: + dprintk("NFSD: nfs4_lockt: bad lock type!\n"); + status = nfserr_inval; + goto out; + } + + lo = find_lockowner_str(cstate->clp, &lockt->lt_owner); + if (lo) + file_lock->c.flc_owner = (fl_owner_t)lo; + file_lock->c.flc_pid = current->tgid; + file_lock->c.flc_flags = FL_POSIX; + + file_lock->fl_start = lockt->lt_offset; + file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); + + nfs4_transform_lock_offset(file_lock); + + status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock); + if (status) + goto out; + + if (file_lock->c.flc_type != F_UNLCK) { + status = nfserr_denied; + nfs4_set_lock_denied(file_lock, &lockt->lt_denied); + } +out: + if (lo) + nfs4_put_stateowner(&lo->lo_owner); + if (file_lock) + locks_free_lock(file_lock); + return status; +} + +void nfsd4_lockt_release(union nfsd4_op_u *u) +{ + struct nfsd4_lockt *lockt = &u->lockt; + struct nfsd4_lock_denied *deny = &lockt->lt_denied; + + kfree(deny->ld_owner.data); +} + +__be32 +nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_locku *locku = &u->locku; + struct nfs4_ol_stateid *stp; + struct nfsd_file *nf = NULL; + struct file_lock *file_lock = NULL; + __be32 status; + int err; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + + dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", + (long long) locku->lu_offset, + (long long) locku->lu_length); + + if (check_lock_length(locku->lu_offset, locku->lu_length)) + return nfserr_inval; + + status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid, + &locku->lu_stateid, SC_TYPE_LOCK, 0, + &stp, nn); + if (status) + goto out; + nf = find_any_file(stp->st_stid.sc_file); + if (!nf) { + status = nfserr_lock_range; + goto put_stateid; + } + if (exportfs_cannot_lock(nf->nf_file->f_path.mnt->mnt_sb->s_export_op)) { + status = nfserr_notsupp; + goto put_file; + } + + file_lock = locks_alloc_lock(); + if (!file_lock) { + dprintk("NFSD: %s: unable to allocate lock!\n", __func__); + status = nfserr_jukebox; + goto put_file; + } + + file_lock->c.flc_type = F_UNLCK; + file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner)); + file_lock->c.flc_pid = current->tgid; + file_lock->c.flc_file = nf->nf_file; + file_lock->c.flc_flags = FL_POSIX; + file_lock->fl_lmops = &nfsd_posix_mng_ops; + file_lock->fl_start = locku->lu_offset; + + file_lock->fl_end = last_byte_offset(locku->lu_offset, + locku->lu_length); + nfs4_transform_lock_offset(file_lock); + + err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL); + if (err) { + dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); + goto out_nfserr; + } + nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid); +put_file: + nfsd_file_put(nf); +put_stateid: + mutex_unlock(&stp->st_mutex); + nfs4_put_stid(&stp->st_stid); +out: + nfsd4_bump_seqid(cstate, status); + if (file_lock) + locks_free_lock(file_lock); + return status; + +out_nfserr: + status = nfserrno(err); + goto put_file; +} + +/* + * returns + * true: locks held by lockowner + * false: no locks held by lockowner + */ +static bool +check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner) +{ + struct file_lock *fl; + int status = false; + struct nfsd_file *nf; + struct inode *inode; + struct file_lock_context *flctx; + + spin_lock(&fp->fi_lock); + nf = find_any_file_locked(fp); + if (!nf) { + /* Any valid lock stateid should have some sort of access */ + WARN_ON_ONCE(1); + goto out; + } + + inode = file_inode(nf->nf_file); + flctx = locks_inode_context(inode); + + if (flctx && !list_empty_careful(&flctx->flc_posix)) { + spin_lock(&flctx->flc_lock); + for_each_file_lock(fl, &flctx->flc_posix) { + if (fl->c.flc_owner == (fl_owner_t)lowner) { + status = true; + break; + } + } + spin_unlock(&flctx->flc_lock); + } +out: + spin_unlock(&fp->fi_lock); + return status; +} + +/** + * nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations + * @rqstp: RPC transaction + * @cstate: NFSv4 COMPOUND state + * @u: RELEASE_LOCKOWNER arguments + * + * Check if there are any locks still held and if not, free the lockowner + * and any lock state that is owned. + * + * Return values: + * %nfs_ok: lockowner released or not found + * %nfserr_locks_held: lockowner still in use + * %nfserr_stale_clientid: clientid no longer active + * %nfserr_expired: clientid not recognized + */ +__be32 +nfsd4_release_lockowner(struct svc_rqst *rqstp, + struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + clientid_t *clid = &rlockowner->rl_clientid; + struct nfs4_ol_stateid *stp; + struct nfs4_lockowner *lo; + struct nfs4_client *clp; + LIST_HEAD(reaplist); + __be32 status; + + dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", + clid->cl_boot, clid->cl_id); + + status = set_client(clid, cstate, nn); + if (status) + return status; + clp = cstate->clp; + + spin_lock(&clp->cl_lock); + lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner); + if (!lo) { + spin_unlock(&clp->cl_lock); + return nfs_ok; + } + + list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) { + if (check_for_locks(stp->st_stid.sc_file, lo)) { + spin_unlock(&clp->cl_lock); + nfs4_put_stateowner(&lo->lo_owner); + return nfserr_locks_held; + } + } + unhash_lockowner_locked(lo); + while (!list_empty(&lo->lo_owner.so_stateids)) { + stp = list_first_entry(&lo->lo_owner.so_stateids, + struct nfs4_ol_stateid, + st_perstateowner); + unhash_lock_stateid(stp); + put_ol_stateid_locked(stp, &reaplist); + } + spin_unlock(&clp->cl_lock); + + free_ol_stateid_reaplist(&reaplist); + remove_blocked_locks(lo); + nfs4_put_stateowner(&lo->lo_owner); + return nfs_ok; +} + +static inline struct nfs4_client_reclaim * +alloc_reclaim(void) +{ + return kmalloc_obj(struct nfs4_client_reclaim); +} + +bool +nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn) +{ + struct nfs4_client_reclaim *crp; + + crp = nfsd4_find_reclaim_client(name, nn); + return (crp && crp->cr_clp); +} + +/* + * failure => all reset bets are off, nfserr_no_grace... + */ +struct nfs4_client_reclaim * +nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash, + struct nfsd_net *nn) +{ + unsigned int strhashval; + struct nfs4_client_reclaim *crp; + + name.data = kmemdup(name.data, name.len, GFP_KERNEL); + if (!name.data) { + dprintk("%s: failed to allocate memory for name.data!\n", + __func__); + return NULL; + } + if (princhash.len) { + princhash.data = kmemdup(princhash.data, princhash.len, GFP_KERNEL); + if (!princhash.data) { + dprintk("%s: failed to allocate memory for princhash.data!\n", + __func__); + kfree(name.data); + return NULL; + } + } else + princhash.data = NULL; + crp = alloc_reclaim(); + if (crp) { + strhashval = clientstr_hashval(name); + INIT_LIST_HEAD(&crp->cr_strhash); + list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]); + crp->cr_name.data = name.data; + crp->cr_name.len = name.len; + crp->cr_princhash.data = princhash.data; + crp->cr_princhash.len = princhash.len; + crp->cr_clp = NULL; + nn->reclaim_str_hashtbl_size++; + } else { + kfree(name.data); + kfree(princhash.data); + } + return crp; +} + +void +nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn) +{ + list_del(&crp->cr_strhash); + kfree(crp->cr_name.data); + kfree(crp->cr_princhash.data); + kfree(crp); + nn->reclaim_str_hashtbl_size--; +} + +void +nfs4_release_reclaim(struct nfsd_net *nn) +{ + struct nfs4_client_reclaim *crp = NULL; + int i; + + for (i = 0; i < CLIENT_HASH_SIZE; i++) { + while (!list_empty(&nn->reclaim_str_hashtbl[i])) { + crp = list_entry(nn->reclaim_str_hashtbl[i].next, + struct nfs4_client_reclaim, cr_strhash); + nfs4_remove_reclaim_record(crp, nn); + } + } + WARN_ON_ONCE(nn->reclaim_str_hashtbl_size); +} + +/* + * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ +struct nfs4_client_reclaim * +nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn) +{ + unsigned int strhashval; + struct nfs4_client_reclaim *crp = NULL; + + strhashval = clientstr_hashval(name); + list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) { + if (compare_blob(&crp->cr_name, &name) == 0) { + return crp; + } + } + return NULL; +} + +__be32 +nfs4_check_open_reclaim(struct nfs4_client *clp) +{ + if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags)) + return nfserr_no_grace; + + if (nfsd4_client_record_check(clp)) + return nfserr_reclaim_bad; + + return nfs_ok; +} + +/* + * Since the lifetime of a delegation isn't limited to that of an open, a + * client may quite reasonably hang on to a delegation as long as it has + * the inode cached. This becomes an obvious problem the first time a + * client's inode cache approaches the size of the server's total memory. + * + * For now we avoid this problem by imposing a hard limit on the number + * of delegations, which varies according to the server's memory size. + */ +static void +set_max_delegations(void) +{ + /* + * Allow at most 4 delegations per megabyte of RAM. Quick + * estimates suggest that in the worst case (where every delegation + * is for a different inode), a delegation could take about 1.5K, + * giving a worst case usage of about 6% of memory. + */ + max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); +} + +static int nfs4_state_create_net(struct net *net) +{ + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + int i; + + nn->conf_id_hashtbl = kmalloc_objs(struct list_head, CLIENT_HASH_SIZE); + if (!nn->conf_id_hashtbl) + goto err; + nn->unconf_id_hashtbl = kmalloc_objs(struct list_head, CLIENT_HASH_SIZE); + if (!nn->unconf_id_hashtbl) + goto err_unconf_id; + nn->sessionid_hashtbl = kmalloc_objs(struct list_head, + SESSION_HASH_SIZE); + if (!nn->sessionid_hashtbl) + goto err_sessionid; + + for (i = 0; i < CLIENT_HASH_SIZE; i++) { + INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]); + INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]); + } + for (i = 0; i < SESSION_HASH_SIZE; i++) + INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]); + nn->conf_name_tree = RB_ROOT; + nn->unconf_name_tree = RB_ROOT; + nn->boot_time = ktime_get_real_seconds(); + nn->grace_ended = false; + nn->grace_end_forced = false; + nn->nfsd4_manager.block_opens = true; + INIT_LIST_HEAD(&nn->nfsd4_manager.list); + INIT_LIST_HEAD(&nn->client_lru); + INIT_LIST_HEAD(&nn->close_lru); + INIT_LIST_HEAD(&nn->del_recall_lru); + spin_lock_init(&nn->deleg_lock); + spin_lock_init(&nn->client_lock); + spin_lock_init(&nn->s2s_cp_lock); + idr_init(&nn->s2s_cp_stateids); + atomic_set(&nn->pending_async_copies, 0); + + spin_lock_init(&nn->blocked_locks_lock); + INIT_LIST_HEAD(&nn->blocked_locks_lru); + + INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main); + /* Make sure this cannot run until client tracking is initialised */ + disable_delayed_work(&nn->laundromat_work); + INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker); + get_net(net); + + nn->nfsd_client_shrinker = shrinker_alloc(0, "nfsd-client"); + if (!nn->nfsd_client_shrinker) + goto err_shrinker; + + nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan; + nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count; + nn->nfsd_client_shrinker->private_data = nn; + + shrinker_register(nn->nfsd_client_shrinker); + + return 0; + +err_shrinker: + put_net(net); + kfree(nn->sessionid_hashtbl); +err_sessionid: + kfree(nn->unconf_id_hashtbl); +err_unconf_id: + kfree(nn->conf_id_hashtbl); +err: + return -ENOMEM; +} + +static void +nfs4_state_destroy_net(struct net *net) +{ + int i; + struct nfs4_client *clp = NULL; + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + for (i = 0; i < CLIENT_HASH_SIZE; i++) { + while (!list_empty(&nn->conf_id_hashtbl[i])) { + clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); + destroy_client(clp); + } + } + + WARN_ON(!list_empty(&nn->blocked_locks_lru)); + + for (i = 0; i < CLIENT_HASH_SIZE; i++) { + while (!list_empty(&nn->unconf_id_hashtbl[i])) { + clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); + destroy_client(clp); + } + } + + kfree(nn->sessionid_hashtbl); + kfree(nn->unconf_id_hashtbl); + kfree(nn->conf_id_hashtbl); + put_net(net); +} + +int +nfs4_state_start_net(struct net *net) +{ + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + int ret; + + ret = nfs4_state_create_net(net); + if (ret) + return ret; + locks_start_grace(net, &nn->nfsd4_manager); + nfsd4_client_tracking_init(net); + /* safe for laundromat to run now */ + enable_delayed_work(&nn->laundromat_work); + if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0) + goto skip_grace; + printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n", + nn->nfsd4_grace, net->ns.inum); + trace_nfsd_grace_start(nn); + queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ); + return 0; + +skip_grace: + printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n", + net->ns.inum); + queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ); + nfsd4_end_grace(nn); + return 0; +} + +/* initialization to perform when the nfsd service is started: */ +int +nfs4_state_start(void) +{ + int ret; + + ret = rhltable_init(&nfs4_file_rhltable, &nfs4_file_rhash_params); + if (ret) + return ret; + + nfsd_slot_shrinker = shrinker_alloc(0, "nfsd-DRC-slot"); + if (!nfsd_slot_shrinker) { + rhltable_destroy(&nfs4_file_rhltable); + return -ENOMEM; + } + nfsd_slot_shrinker->count_objects = nfsd_slot_count; + nfsd_slot_shrinker->scan_objects = nfsd_slot_scan; + shrinker_register(nfsd_slot_shrinker); + + set_max_delegations(); + return 0; +} + +void +nfs4_state_shutdown_net(struct net *net) +{ + struct nfs4_delegation *dp = NULL; + struct list_head *pos, *next, reaplist; + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + shrinker_free(nn->nfsd_client_shrinker); + cancel_work_sync(&nn->nfsd_shrinker_work); + disable_delayed_work_sync(&nn->laundromat_work); + locks_end_grace(&nn->nfsd4_manager); + + INIT_LIST_HEAD(&reaplist); + spin_lock(&nn->deleg_lock); + list_for_each_safe(pos, next, &nn->del_recall_lru) { + dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); + unhash_delegation_locked(dp, SC_STATUS_CLOSED); + list_add(&dp->dl_recall_lru, &reaplist); + } + spin_unlock(&nn->deleg_lock); + list_for_each_safe(pos, next, &reaplist) { + dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); + list_del_init(&dp->dl_recall_lru); + destroy_unhashed_deleg(dp); + } + + nfsd4_client_tracking_exit(net); + nfs4_state_destroy_net(net); +#ifdef CONFIG_NFSD_V4_2_INTER_SSC + nfsd4_ssc_shutdown_umount(nn); +#endif +} + +void +nfs4_state_shutdown(void) +{ + rhltable_destroy(&nfs4_file_rhltable); + shrinker_free(nfsd_slot_shrinker); +} + +static void +get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) +{ + if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) && + CURRENT_STATEID(stateid)) + memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t)); +} + +static void +put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) +{ + if (cstate->minorversion) { + memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t)); + SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG); + } +} + +void +clear_current_stateid(struct nfsd4_compound_state *cstate) +{ + CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG); +} + +/* + * functions to set current state id + */ +void +nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + put_stateid(cstate, &u->open_downgrade.od_stateid); +} + +void +nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + put_stateid(cstate, &u->open.op_stateid); +} + +void +nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + put_stateid(cstate, &u->close.cl_stateid); +} + +void +nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + put_stateid(cstate, &u->lock.lk_resp_stateid); +} + +/* + * functions to consume current state id + */ + +void +nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->open_downgrade.od_stateid); +} + +void +nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->delegreturn.dr_stateid); +} + +void +nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->free_stateid.fr_stateid); +} + +void +nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->setattr.sa_stateid); +} + +void +nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->close.cl_stateid); +} + +void +nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->locku.lu_stateid); +} + +void +nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->read.rd_stateid); +} + +void +nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, + union nfsd4_op_u *u) +{ + get_stateid(cstate, &u->write.wr_stateid); +} + +/** + * nfsd4_vet_deleg_time - vet and set the timespec for a delegated timestamp update + * @req: timestamp from the client + * @orig: original timestamp in the inode + * @now: current time + * + * Given a timestamp from the client response, check it against the + * current timestamp in the inode and the current time. Returns true + * if the inode's timestamp needs to be updated, and false otherwise. + * @req may also be changed if the timestamp needs to be clamped. + */ +bool nfsd4_vet_deleg_time(struct timespec64 *req, const struct timespec64 *orig, + const struct timespec64 *now) +{ + + /* + * "When the time presented is before the original time, then the + * update is ignored." Also no need to update if there is no change. + */ + if (timespec64_compare(req, orig) <= 0) + return false; + + /* + * "When the time presented is in the future, the server can either + * clamp the new time to the current time, or it may + * return NFS4ERR_DELAY to the client, allowing it to retry." + */ + if (timespec64_compare(req, now) > 0) + *req = *now; + + return true; +} + +static int cb_getattr_update_times(struct dentry *dentry, struct nfs4_delegation *dp) +{ + struct inode *inode = d_inode(dentry); + struct nfs4_cb_fattr *ncf = &dp->dl_cb_fattr; + struct iattr attrs = { }; + int ret; + + if (deleg_attrs_deleg(dp->dl_type)) { + struct timespec64 now = current_time(inode); + + attrs.ia_atime = ncf->ncf_cb_atime; + attrs.ia_mtime = ncf->ncf_cb_mtime; + + if (nfsd4_vet_deleg_time(&attrs.ia_atime, &dp->dl_atime, &now)) + attrs.ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; + + if (nfsd4_vet_deleg_time(&attrs.ia_mtime, &dp->dl_mtime, &now)) { + attrs.ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; + attrs.ia_ctime = attrs.ia_mtime; + if (nfsd4_vet_deleg_time(&attrs.ia_ctime, &dp->dl_ctime, &now)) + attrs.ia_valid |= ATTR_CTIME | ATTR_CTIME_SET; + } + } else { + attrs.ia_valid |= ATTR_MTIME | ATTR_CTIME; + } + + if (!attrs.ia_valid) + return 0; + + attrs.ia_valid |= ATTR_DELEG; + inode_lock(inode); + ret = notify_change(&nop_mnt_idmap, dentry, &attrs, NULL); + inode_unlock(inode); + return ret; +} + +/** + * nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict + * @rqstp: RPC transaction context + * @dentry: dentry of inode to be checked for a conflict + * @pdp: returned WRITE delegation, if one was found + * + * This function is called when there is a conflict between a write + * delegation and a change/size GETATTR from another client. The server + * must either use the CB_GETATTR to get the current values of the + * attributes from the client that holds the delegation or recall the + * delegation before replying to the GETATTR. See RFC 8881 section + * 18.7.4. + * + * Returns 0 if there is no conflict; otherwise an nfs_stat + * code is returned. If @pdp is set to a non-NULL value, then the + * caller must put the reference. + */ +__be32 +nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct dentry *dentry, + struct nfs4_delegation **pdp) +{ + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + struct nfsd_thread_local_info *ntli = rqstp->rq_private; + struct file_lock_context *ctx; + struct nfs4_delegation *dp = NULL; + struct file_lease *fl; + struct nfs4_cb_fattr *ncf; + struct inode *inode = d_inode(dentry); + __be32 status; + + ctx = locks_inode_context(inode); + if (!ctx) + return nfs_ok; + +#define NON_NFSD_LEASE ((void *)1) + + spin_lock(&ctx->flc_lock); + for_each_file_lock(fl, &ctx->flc_lease) { + if (fl->c.flc_flags == FL_LAYOUT) + continue; + if (fl->c.flc_type == F_WRLCK) { + if (fl->fl_lmops == &nfsd_lease_mng_ops) + dp = fl->c.flc_owner; + else + dp = NON_NFSD_LEASE; + } + break; + } + if (dp == NULL || dp == NON_NFSD_LEASE || + dp->dl_recall.cb_clp == *(ntli->ntli_lease_breaker)) { + spin_unlock(&ctx->flc_lock); + if (dp == NON_NFSD_LEASE) { + status = nfserrno(nfsd_open_break_lease(inode, + NFSD_MAY_READ)); + if (status != nfserr_jukebox || + !nfsd_wait_for_delegreturn(rqstp, inode)) + return status; + } + return 0; + } + + nfsd_stats_wdeleg_getattr_inc(nn); + refcount_inc(&dp->dl_stid.sc_count); + ncf = &dp->dl_cb_fattr; + nfs4_cb_getattr(&dp->dl_cb_fattr); + spin_unlock(&ctx->flc_lock); + + wait_on_bit_timeout(&ncf->ncf_getattr.cb_flags, NFSD4_CALLBACK_RUNNING, + TASK_UNINTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT); + if (ncf->ncf_cb_status) { + /* Recall delegation only if client didn't respond */ + status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ)); + if (status != nfserr_jukebox || + !nfsd_wait_for_delegreturn(rqstp, inode)) + goto out_status; + status = nfs_ok; + goto out_status; + } + if (!ncf->ncf_file_modified) { + if (ncf->ncf_initial_cinfo != ncf->ncf_cb_change) + ncf->ncf_file_modified = true; + else if (i_size_read(inode) != ncf->ncf_cb_fsize) + ncf->ncf_file_modified = true; + } + if (ncf->ncf_file_modified) { + int err; + + /* + * Per section 10.4.3 of RFC 8881, the server would + * not update the file's metadata with the client's + * modified size + */ + err = cb_getattr_update_times(dentry, dp); + if (err) { + status = nfserrno(err); + goto out_status; + } + ncf->ncf_cur_fsize = ncf->ncf_cb_fsize; + *pdp = dp; + return nfs_ok; + } + status = nfs_ok; +out_status: + nfs4_put_stid(&dp->dl_stid); + return status; +} + +/** + * nfsd_get_dir_deleg - attempt to get a directory delegation + * @cstate: compound state + * @gdd: GET_DIR_DELEGATION arg/resp structure + * @nf: nfsd_file opened on the directory + * + * Given a GET_DIR_DELEGATION request @gdd, attempt to acquire a delegation + * on the directory to which @nf refers. Note that this does not set up any + * sort of async notifications for the delegation. + */ +struct nfs4_delegation * +nfsd_get_dir_deleg(struct nfsd4_compound_state *cstate, + struct nfsd4_get_dir_delegation *gdd, + struct nfsd_file *nf) +{ + struct nfs4_client *clp = cstate->clp; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + struct nfs4_delegation *dp; + struct file_lease *fl; + struct nfs4_file *fp, *rfp; + int status = 0; + + fp = nfsd4_alloc_file(); + if (!fp) + return ERR_PTR(-ENOMEM); + + nfsd4_file_init(&cstate->current_fh, fp); + + rfp = nfsd4_file_hash_insert(fp, &cstate->current_fh); + if (unlikely(!rfp)) { + put_nfs4_file(fp); + return ERR_PTR(-ENOMEM); + } + + if (rfp != fp) { + put_nfs4_file(fp); + fp = rfp; + } + + /* if this client already has one, return that it's unavailable */ + spin_lock(&nn->deleg_lock); + spin_lock(&fp->fi_lock); + /* existing delegation? */ + if (nfs4_delegation_exists(clp, fp)) { + status = -EAGAIN; + } else if (!fp->fi_deleg_file) { + fp->fi_deleg_file = nfsd_file_get(nf); + fp->fi_delegees = 1; + } else { + ++fp->fi_delegees; + } + spin_unlock(&fp->fi_lock); + spin_unlock(&nn->deleg_lock); + + if (status) { + put_nfs4_file(fp); + return ERR_PTR(status); + } + + /* Try to set up the lease */ + status = -ENOMEM; + dp = alloc_init_deleg(clp, fp, NULL, NFS4_OPEN_DELEGATE_READ); + if (!dp) + goto out_delegees; + if (cstate->current_fh.fh_export) + dp->dl_stid.sc_export = + exp_get(cstate->current_fh.fh_export); + + fl = nfs4_alloc_init_lease(dp); + if (!fl) + goto out_put_stid; + + status = kernel_setlease(nf->nf_file, + fl->c.flc_type, &fl, NULL); + if (fl) + locks_free_lease(fl); + if (status) + goto out_put_stid; + + /* + * Now, try to hash it. This can fail if we race another nfsd task + * trying to set a delegation on the same file. If that happens, + * then just say UNAVAIL. + */ + spin_lock(&nn->deleg_lock); + spin_lock(&clp->cl_lock); + spin_lock(&fp->fi_lock); + status = hash_delegation_locked(dp, fp); + spin_unlock(&fp->fi_lock); + spin_unlock(&clp->cl_lock); + spin_unlock(&nn->deleg_lock); + + if (!status) { + put_nfs4_file(fp); + return dp; + } + + /* Something failed. Drop the lease and clean up the stid */ + kernel_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp); +out_put_stid: + nfs4_put_stid(&dp->dl_stid); +out_delegees: + put_deleg_file(fp); + put_nfs4_file(fp); + return ERR_PTR(status); +} + +/** + * nfsd_update_cmtime_attr - update file's delegated ctime/mtime, + * and optionally other attributes (ie ATTR_ATIME). + * @f: pointer to an opened file + * @flags: any additional flags that should be updated + * + * Given upon opening a file delegated attributes were issues, update + * @f attributes to current times. + */ +void nfsd_update_cmtime_attr(struct file *f, unsigned int flags) +{ + int ret; + struct inode *inode = file_inode(f); + struct iattr attr = { + .ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_DELEG | flags, + }; + + inode_lock(inode); + ret = notify_change(&nop_mnt_idmap, f->f_path.dentry, &attr, NULL); + inode_unlock(inode); + if (ret) + pr_notice_ratelimited("nfsd: Unable to update timestamps on " + "inode %02x:%02x:%llu: %d\n", + MAJOR(inode->i_sb->s_dev), + MINOR(inode->i_sb->s_dev), + inode->i_ino, ret); +} |