From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- fs/afs/proc.c | 786 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 786 insertions(+) create mode 100644 fs/afs/proc.c (limited to 'fs/afs/proc.c') diff --git a/fs/afs/proc.c b/fs/afs/proc.c new file mode 100644 index 000000000..a9cc5cdb4 --- /dev/null +++ b/fs/afs/proc.c @@ -0,0 +1,786 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* /proc interface for AFS + * + * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include +#include +#include +#include +#include +#include "internal.h" + +struct afs_vl_seq_net_private { + struct seq_net_private seq; /* Must be first */ + struct afs_vlserver_list *vllist; +}; + +static inline struct afs_net *afs_seq2net(struct seq_file *m) +{ + return afs_net(seq_file_net(m)); +} + +static inline struct afs_net *afs_seq2net_single(struct seq_file *m) +{ + return afs_net(seq_file_single_net(m)); +} + +/* + * Display the list of cells known to the namespace. + */ +static int afs_proc_cells_show(struct seq_file *m, void *v) +{ + struct afs_vlserver_list *vllist; + struct afs_cell *cell; + + if (v == SEQ_START_TOKEN) { + /* display header on line 1 */ + seq_puts(m, "USE ACT TTL SV ST NAME\n"); + return 0; + } + + cell = list_entry(v, struct afs_cell, proc_link); + vllist = rcu_dereference(cell->vl_servers); + + /* display one cell per line on subsequent lines */ + seq_printf(m, "%3u %3u %6lld %2u %2u %s\n", + refcount_read(&cell->ref), + atomic_read(&cell->active), + cell->dns_expiry - ktime_get_real_seconds(), + vllist ? vllist->nr_servers : 0, + cell->state, + cell->name); + return 0; +} + +static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos) + __acquires(rcu) +{ + rcu_read_lock(); + return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos); +} + +static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos) +{ + return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos); +} + +static void afs_proc_cells_stop(struct seq_file *m, void *v) + __releases(rcu) +{ + rcu_read_unlock(); +} + +static const struct seq_operations afs_proc_cells_ops = { + .start = afs_proc_cells_start, + .next = afs_proc_cells_next, + .stop = afs_proc_cells_stop, + .show = afs_proc_cells_show, +}; + +/* + * handle writes to /proc/fs/afs/cells + * - to add cells: echo "add [:][:]" + */ +static int afs_proc_cells_write(struct file *file, char *buf, size_t size) +{ + struct seq_file *m = file->private_data; + struct afs_net *net = afs_seq2net(m); + char *name, *args; + int ret; + + /* trim to first NL */ + name = memchr(buf, '\n', size); + if (name) + *name = 0; + + /* split into command, name and argslist */ + name = strchr(buf, ' '); + if (!name) + goto inval; + do { + *name++ = 0; + } while(*name == ' '); + if (!*name) + goto inval; + + args = strchr(name, ' '); + if (args) { + do { + *args++ = 0; + } while(*args == ' '); + if (!*args) + goto inval; + } + + /* determine command to perform */ + _debug("cmd=%s name=%s args=%s", buf, name, args); + + if (strcmp(buf, "add") == 0) { + struct afs_cell *cell; + + cell = afs_lookup_cell(net, name, strlen(name), args, + AFS_LOOKUP_CELL_PRELOAD, + afs_cell_trace_use_lookup_add); + if (IS_ERR(cell)) { + ret = PTR_ERR(cell); + goto done; + } + + if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags)) + afs_unuse_cell(cell, afs_cell_trace_unuse_no_pin); + } else { + goto inval; + } + + ret = 0; + +done: + _leave(" = %d", ret); + return ret; + +inval: + ret = -EINVAL; + printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n"); + goto done; +} + +/* + * Display the list of addr_prefs known to the namespace. + */ +static int afs_proc_addr_prefs_show(struct seq_file *m, void *v) +{ + struct afs_addr_preference_list *preflist; + struct afs_addr_preference *pref; + struct afs_net *net = afs_seq2net_single(m); + union { + struct sockaddr_in sin; + struct sockaddr_in6 sin6; + } addr; + unsigned int i; + char buf[44]; /* Maximum ipv6 + max subnet is 43 */ + + rcu_read_lock(); + preflist = rcu_dereference(net->address_prefs); + + if (!preflist) { + seq_puts(m, "NO PREFS\n"); + goto out; + } + + seq_printf(m, "PROT SUBNET PRIOR (v=%u n=%u/%u/%u)\n", + preflist->version, preflist->ipv6_off, preflist->nr, preflist->max_prefs); + + memset(&addr, 0, sizeof(addr)); + + for (i = 0; i < preflist->nr; i++) { + pref = &preflist->prefs[i]; + + addr.sin.sin_family = pref->family; + if (pref->family == AF_INET) { + memcpy(&addr.sin.sin_addr, &pref->ipv4_addr, + sizeof(addr.sin.sin_addr)); + snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin, pref->subnet_mask); + seq_printf(m, "UDP %-43.43s %5u\n", buf, pref->prio); + } else { + memcpy(&addr.sin6.sin6_addr, &pref->ipv6_addr, + sizeof(addr.sin6.sin6_addr)); + snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin6, pref->subnet_mask); + seq_printf(m, "UDP %-43.43s %5u\n", buf, pref->prio); + } + } + +out: + rcu_read_unlock(); + return 0; +} + +/* + * Display the name of the current workstation cell. + */ +static int afs_proc_rootcell_show(struct seq_file *m, void *v) +{ + struct afs_cell *cell; + struct afs_net *net; + + net = afs_seq2net_single(m); + down_read(&net->cells_lock); + cell = rcu_dereference_protected(net->ws_cell, lockdep_is_held(&net->cells_lock)); + if (cell) + seq_printf(m, "%s\n", cell->name); + up_read(&net->cells_lock); + return 0; +} + +/* + * Set the current workstation cell and optionally supply its list of volume + * location servers. + * + * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell + */ +static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size) +{ + struct seq_file *m = file->private_data; + struct afs_net *net = afs_seq2net_single(m); + char *s; + int ret; + + ret = -EINVAL; + if (buf[0] == '.') + goto out; + if (memchr(buf, '/', size)) + goto out; + + /* trim to first NL */ + s = memchr(buf, '\n', size); + if (s) + *s = 0; + + /* determine command to perform */ + _debug("rootcell=%s", buf); + + ret = -EEXIST; + inode_lock(file_inode(file)); + if (!rcu_access_pointer(net->ws_cell)) + ret = afs_cell_init(net, buf); + else + printk("busy\n"); + inode_unlock(file_inode(file)); + +out: + _leave(" = %d", ret); + return ret; +} + +static const char afs_vol_types[3][3] = { + [AFSVL_RWVOL] = "RW", + [AFSVL_ROVOL] = "RO", + [AFSVL_BACKVOL] = "BK", +}; + +/* + * Display the list of volumes known to a cell. + */ +static int afs_proc_cell_volumes_show(struct seq_file *m, void *v) +{ + struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link); + + /* Display header on line 1 */ + if (v == SEQ_START_TOKEN) { + seq_puts(m, "USE VID TY NAME\n"); + return 0; + } + + seq_printf(m, "%3d %08llx %s %s\n", + refcount_read(&vol->ref), vol->vid, + afs_vol_types[vol->type], + vol->name); + + return 0; +} + +static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos) + __acquires(cell->proc_lock) +{ + struct afs_cell *cell = pde_data(file_inode(m->file)); + + rcu_read_lock(); + return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos); +} + +static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v, + loff_t *_pos) +{ + struct afs_cell *cell = pde_data(file_inode(m->file)); + + return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos); +} + +static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v) + __releases(cell->proc_lock) +{ + rcu_read_unlock(); +} + +static const struct seq_operations afs_proc_cell_volumes_ops = { + .start = afs_proc_cell_volumes_start, + .next = afs_proc_cell_volumes_next, + .stop = afs_proc_cell_volumes_stop, + .show = afs_proc_cell_volumes_show, +}; + +static const char *const dns_record_sources[NR__dns_record_source + 1] = { + [DNS_RECORD_UNAVAILABLE] = "unav", + [DNS_RECORD_FROM_CONFIG] = "cfg", + [DNS_RECORD_FROM_DNS_A] = "A", + [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB", + [DNS_RECORD_FROM_DNS_SRV] = "SRV", + [DNS_RECORD_FROM_NSS] = "nss", + [NR__dns_record_source] = "[weird]" +}; + +static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = { + [DNS_LOOKUP_NOT_DONE] = "no-lookup", + [DNS_LOOKUP_GOOD] = "good", + [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad", + [DNS_LOOKUP_BAD] = "bad", + [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found", + [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure", + [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure", + [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure", + [NR__dns_lookup_status] = "[weird]" +}; + +/* + * Display the list of Volume Location servers we're using for a cell. + */ +static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v) +{ + const struct afs_vl_seq_net_private *priv = m->private; + const struct afs_vlserver_list *vllist = priv->vllist; + const struct afs_vlserver_entry *entry; + const struct afs_vlserver *vlserver; + const struct afs_addr_list *alist; + int i; + + if (v == SEQ_START_TOKEN) { + seq_printf(m, "# source %s, status %s\n", + dns_record_sources[vllist ? vllist->source : 0], + dns_lookup_statuses[vllist ? vllist->status : 0]); + return 0; + } + + entry = v; + vlserver = entry->server; + alist = rcu_dereference(vlserver->addresses); + + seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n", + vlserver->name, entry->priority, entry->weight, + dns_record_sources[alist ? alist->source : entry->source], + dns_lookup_statuses[alist ? alist->status : entry->status]); + if (alist) { + for (i = 0; i < alist->nr_addrs; i++) + seq_printf(m, " %c %pISpc\n", + alist->preferred == i ? '>' : '-', + rxrpc_kernel_remote_addr(alist->addrs[i].peer)); + } + seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt); + seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n", + vlserver->probe.flags, vlserver->probe.error, + vlserver->probe.abort_code, + atomic_read(&vlserver->probe_outstanding)); + return 0; +} + +static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos) + __acquires(rcu) +{ + struct afs_vl_seq_net_private *priv = m->private; + struct afs_vlserver_list *vllist; + struct afs_cell *cell = pde_data(file_inode(m->file)); + loff_t pos = *_pos; + + rcu_read_lock(); + + vllist = rcu_dereference(cell->vl_servers); + priv->vllist = vllist; + + if (pos < 0) + *_pos = pos = 0; + if (pos == 0) + return SEQ_START_TOKEN; + + if (pos - 1 >= vllist->nr_servers) + return NULL; + + return &vllist->servers[pos - 1]; +} + +static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v, + loff_t *_pos) +{ + struct afs_vl_seq_net_private *priv = m->private; + struct afs_vlserver_list *vllist = priv->vllist; + loff_t pos; + + pos = *_pos; + pos++; + *_pos = pos; + if (!vllist || pos - 1 >= vllist->nr_servers) + return NULL; + + return &vllist->servers[pos - 1]; +} + +static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v) + __releases(rcu) +{ + rcu_read_unlock(); +} + +static const struct seq_operations afs_proc_cell_vlservers_ops = { + .start = afs_proc_cell_vlservers_start, + .next = afs_proc_cell_vlservers_next, + .stop = afs_proc_cell_vlservers_stop, + .show = afs_proc_cell_vlservers_show, +}; + +/* + * Display the list of fileservers we're using within a namespace. + */ +static int afs_proc_servers_show(struct seq_file *m, void *v) +{ + struct afs_endpoint_state *estate; + struct afs_addr_list *alist; + struct afs_server *server; + unsigned long failed; + int i; + + if (v == SEQ_START_TOKEN) { + seq_puts(m, "UUID REF ACT CELL\n"); + return 0; + } + + server = list_entry(v, struct afs_server, proc_link); + seq_printf(m, "%pU %3d %3d %s\n", + &server->uuid, + refcount_read(&server->ref), + atomic_read(&server->active), + server->cell->name); + seq_printf(m, " - info: fl=%lx rtt=%u\n", + server->flags, server->rtt); + seq_printf(m, " - probe: last=%d\n", + (int)(jiffies - server->probed_at) / HZ); + + estate = rcu_dereference(server->endpoint_state); + if (!estate) + goto out; + failed = estate->failed_set; + seq_printf(m, " - ESTATE pq=%x np=%u rsp=%lx f=%lx\n", + estate->probe_seq, atomic_read(&estate->nr_probing), + estate->responsive_set, estate->failed_set); + + alist = estate->addresses; + seq_printf(m, " - ALIST v=%u ap=%u\n", + alist->version, alist->addr_pref_version); + for (i = 0; i < alist->nr_addrs; i++) { + const struct afs_address *addr = &alist->addrs[i]; + + seq_printf(m, " [%x] %pISpc%s rtt=%d err=%d p=%u\n", + i, rxrpc_kernel_remote_addr(addr->peer), + alist->preferred == i ? "*" : + test_bit(i, &failed) ? "!" : "", + rxrpc_kernel_get_srtt(addr->peer), + addr->last_error, addr->prio); + } + +out: + return 0; +} + +static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos) + __acquires(rcu) +{ + rcu_read_lock(); + return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos); +} + +static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos) +{ + return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos); +} + +static void afs_proc_servers_stop(struct seq_file *m, void *v) + __releases(rcu) +{ + rcu_read_unlock(); +} + +static const struct seq_operations afs_proc_servers_ops = { + .start = afs_proc_servers_start, + .next = afs_proc_servers_next, + .stop = afs_proc_servers_stop, + .show = afs_proc_servers_show, +}; + +/* + * Display the list of strings that may be substituted for the @sys pathname + * macro. + */ +static int afs_proc_sysname_show(struct seq_file *m, void *v) +{ + struct afs_net *net = afs_seq2net(m); + struct afs_sysnames *sysnames = net->sysnames; + unsigned int i = (unsigned long)v - 1; + + if (i < sysnames->nr) + seq_printf(m, "%s\n", sysnames->subs[i]); + return 0; +} + +static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos) + __acquires(&net->sysnames_lock) +{ + struct afs_net *net = afs_seq2net(m); + struct afs_sysnames *names; + + read_lock(&net->sysnames_lock); + + names = net->sysnames; + if (*pos >= names->nr) + return NULL; + return (void *)(unsigned long)(*pos + 1); +} + +static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct afs_net *net = afs_seq2net(m); + struct afs_sysnames *names = net->sysnames; + + *pos += 1; + if (*pos >= names->nr) + return NULL; + return (void *)(unsigned long)(*pos + 1); +} + +static void afs_proc_sysname_stop(struct seq_file *m, void *v) + __releases(&net->sysnames_lock) +{ + struct afs_net *net = afs_seq2net(m); + + read_unlock(&net->sysnames_lock); +} + +static const struct seq_operations afs_proc_sysname_ops = { + .start = afs_proc_sysname_start, + .next = afs_proc_sysname_next, + .stop = afs_proc_sysname_stop, + .show = afs_proc_sysname_show, +}; + +/* + * Allow the @sys substitution to be configured. + */ +static int afs_proc_sysname_write(struct file *file, char *buf, size_t size) +{ + struct afs_sysnames *sysnames, *kill; + struct seq_file *m = file->private_data; + struct afs_net *net = afs_seq2net(m); + char *s, *p, *sub; + int ret, len; + + sysnames = kzalloc_obj(*sysnames); + if (!sysnames) + return -ENOMEM; + refcount_set(&sysnames->usage, 1); + kill = sysnames; + + p = buf; + while ((s = strsep(&p, " \t\n"))) { + len = strlen(s); + if (len == 0) + continue; + ret = -ENAMETOOLONG; + if (len >= AFSNAMEMAX) + goto error; + + if (len >= 4 && + s[len - 4] == '@' && + s[len - 3] == 's' && + s[len - 2] == 'y' && + s[len - 1] == 's') + /* Protect against recursion */ + goto invalid; + + if (s[0] == '.' && + (len < 2 || (len == 2 && s[1] == '.'))) + goto invalid; + + if (memchr(s, '/', len)) + goto invalid; + + ret = -EFBIG; + if (sysnames->nr >= AFS_NR_SYSNAME) + goto out; + + if (strcmp(s, afs_init_sysname) == 0) { + sub = (char *)afs_init_sysname; + } else { + ret = -ENOMEM; + sub = kmemdup(s, len + 1, GFP_KERNEL); + if (!sub) + goto out; + } + + sysnames->subs[sysnames->nr] = sub; + sysnames->nr++; + } + + if (sysnames->nr == 0) { + sysnames->subs[0] = sysnames->blank; + sysnames->nr++; + } + + write_lock(&net->sysnames_lock); + kill = net->sysnames; + net->sysnames = sysnames; + write_unlock(&net->sysnames_lock); + ret = 0; +out: + afs_put_sysnames(kill); + return ret; + +invalid: + ret = -EINVAL; +error: + goto out; +} + +void afs_put_sysnames(struct afs_sysnames *sysnames) +{ + int i; + + if (sysnames && refcount_dec_and_test(&sysnames->usage)) { + for (i = 0; i < sysnames->nr; i++) + if (sysnames->subs[i] != afs_init_sysname && + sysnames->subs[i] != sysnames->blank) + kfree(sysnames->subs[i]); + kfree(sysnames); + } +} + +/* + * Display general per-net namespace statistics + */ +static int afs_proc_stats_show(struct seq_file *m, void *v) +{ + struct afs_net *net = afs_seq2net_single(m); + + seq_puts(m, "kAFS statistics\n"); + + seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n", + atomic_read(&net->n_lookup), + atomic_read(&net->n_reval), + atomic_read(&net->n_inval), + atomic_read(&net->n_relpg)); + + seq_printf(m, "dir-data: rdpg=%u\n", + atomic_read(&net->n_read_dir)); + + seq_printf(m, "dir-edit: cr=%u rm=%u\n", + atomic_read(&net->n_dir_cr), + atomic_read(&net->n_dir_rm)); + + seq_printf(m, "file-rd : n=%u nb=%lu\n", + atomic_read(&net->n_fetches), + atomic_long_read(&net->n_fetch_bytes)); + seq_printf(m, "file-wr : n=%u nb=%lu\n", + atomic_read(&net->n_stores), + atomic_long_read(&net->n_store_bytes)); + return 0; +} + +/* + * initialise /proc/fs/afs// + */ +int afs_proc_cell_setup(struct afs_cell *cell) +{ + struct proc_dir_entry *dir; + struct afs_net *net = cell->net; + + _enter("%p{%s},%p", cell, cell->name, net->proc_afs); + + dir = proc_net_mkdir(net->net, cell->name, net->proc_afs); + if (!dir) + goto error_dir; + + if (!proc_create_net_data("vlservers", 0444, dir, + &afs_proc_cell_vlservers_ops, + sizeof(struct afs_vl_seq_net_private), + cell) || + !proc_create_net_data("volumes", 0444, dir, + &afs_proc_cell_volumes_ops, + sizeof(struct seq_net_private), + cell)) + goto error_tree; + + _leave(" = 0"); + return 0; + +error_tree: + remove_proc_subtree(cell->name, net->proc_afs); +error_dir: + _leave(" = -ENOMEM"); + return -ENOMEM; +} + +/* + * remove /proc/fs/afs// + */ +void afs_proc_cell_remove(struct afs_cell *cell) +{ + struct afs_net *net = cell->net; + + _enter(""); + remove_proc_subtree(cell->name, net->proc_afs); + _leave(""); +} + +/* + * initialise the /proc/fs/afs/ directory + */ +int afs_proc_init(struct afs_net *net) +{ + struct proc_dir_entry *p; + + _enter(""); + + p = proc_net_mkdir(net->net, "afs", net->net->proc_net); + if (!p) + goto error_dir; + + if (!proc_create_net_data_write("cells", 0644, p, + &afs_proc_cells_ops, + afs_proc_cells_write, + sizeof(struct seq_net_private), + NULL) || + !proc_create_net_single_write("rootcell", 0644, p, + afs_proc_rootcell_show, + afs_proc_rootcell_write, + NULL) || + !proc_create_net("servers", 0444, p, &afs_proc_servers_ops, + sizeof(struct seq_net_private)) || + !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) || + !proc_create_net_data_write("sysname", 0644, p, + &afs_proc_sysname_ops, + afs_proc_sysname_write, + sizeof(struct seq_net_private), + NULL) || + !proc_create_net_single_write("addr_prefs", 0644, p, + afs_proc_addr_prefs_show, + afs_proc_addr_prefs_write, + NULL)) + goto error_tree; + + net->proc_afs = p; + _leave(" = 0"); + return 0; + +error_tree: + proc_remove(p); +error_dir: + _leave(" = -ENOMEM"); + return -ENOMEM; +} + +/* + * clean up the /proc/fs/afs/ directory + */ +void afs_proc_cleanup(struct afs_net *net) +{ + proc_remove(net->proc_afs); + net->proc_afs = NULL; +} -- cgit v1.3.1