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/dlm/rcom.c | 691 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 691 insertions(+) create mode 100644 fs/dlm/rcom.c (limited to 'fs/dlm/rcom.c') diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c new file mode 100644 index 000000000..be1a71a63 --- /dev/null +++ b/fs/dlm/rcom.c @@ -0,0 +1,691 @@ +// SPDX-License-Identifier: GPL-2.0-only +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. +** +** +******************************************************************************* +******************************************************************************/ + +#include "dlm_internal.h" +#include "lockspace.h" +#include "member.h" +#include "lowcomms.h" +#include "midcomms.h" +#include "rcom.h" +#include "recover.h" +#include "dir.h" +#include "config.h" +#include "memory.h" +#include "lock.h" +#include "util.h" + +static int rcom_response(struct dlm_ls *ls) +{ + return test_bit(LSFL_RCOM_READY, &ls->ls_flags); +} + +static void _create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len, + struct dlm_rcom **rc_ret, char *mb, int mb_len, + uint64_t seq) +{ + struct dlm_rcom *rc; + + rc = (struct dlm_rcom *) mb; + + rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR); + rc->rc_header.u.h_lockspace = cpu_to_le32(ls->ls_global_id); + rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid()); + rc->rc_header.h_length = cpu_to_le16(mb_len); + rc->rc_header.h_cmd = DLM_RCOM; + + rc->rc_type = cpu_to_le32(type); + rc->rc_seq = cpu_to_le64(seq); + + *rc_ret = rc; +} + +static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len, + struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret, + uint64_t seq) +{ + int mb_len = sizeof(struct dlm_rcom) + len; + struct dlm_mhandle *mh; + char *mb; + + mh = dlm_midcomms_get_mhandle(to_nodeid, mb_len, &mb); + if (!mh) { + log_print("%s to %d type %d len %d ENOBUFS", + __func__, to_nodeid, type, len); + return -ENOBUFS; + } + + _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len, seq); + *mh_ret = mh; + return 0; +} + +static int create_rcom_stateless(struct dlm_ls *ls, int to_nodeid, int type, + int len, struct dlm_rcom **rc_ret, + struct dlm_msg **msg_ret, uint64_t seq) +{ + int mb_len = sizeof(struct dlm_rcom) + len; + struct dlm_msg *msg; + char *mb; + + msg = dlm_lowcomms_new_msg(to_nodeid, mb_len, &mb, NULL, NULL); + if (!msg) { + log_print("create_rcom to %d type %d len %d ENOBUFS", + to_nodeid, type, len); + return -ENOBUFS; + } + + _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len, seq); + *msg_ret = msg; + return 0; +} + +static void send_rcom(struct dlm_mhandle *mh, struct dlm_rcom *rc) +{ + dlm_midcomms_commit_mhandle(mh, NULL, 0); +} + +static void send_rcom_stateless(struct dlm_msg *msg, struct dlm_rcom *rc) +{ + dlm_lowcomms_commit_msg(msg); + dlm_lowcomms_put_msg(msg); +} + +static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs, + uint32_t flags) +{ + rs->rs_flags = cpu_to_le32(flags); +} + +/* When replying to a status request, a node also sends back its + configuration values. The requesting node then checks that the remote + node is configured the same way as itself. */ + +static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf, + uint32_t num_slots) +{ + rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen); + rf->rf_lsflags = cpu_to_le32(ls->ls_exflags); + + rf->rf_our_slot = cpu_to_le16(ls->ls_slot); + rf->rf_num_slots = cpu_to_le16(num_slots); + rf->rf_generation = cpu_to_le32(ls->ls_generation); +} + +static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) +{ + struct rcom_config *rf = (struct rcom_config *) rc->rc_buf; + + if ((le32_to_cpu(rc->rc_header.h_version) & 0xFFFF0000) != DLM_HEADER_MAJOR) { + log_error(ls, "version mismatch: %x nodeid %d: %x", + DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid, + le32_to_cpu(rc->rc_header.h_version)); + return -EPROTO; + } + + if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen || + le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) { + log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x", + ls->ls_lvblen, ls->ls_exflags, nodeid, + le32_to_cpu(rf->rf_lvblen), + le32_to_cpu(rf->rf_lsflags)); + return -EPROTO; + } + return 0; +} + +static void allow_sync_reply(struct dlm_ls *ls, __le64 *new_seq) +{ + spin_lock_bh(&ls->ls_rcom_spin); + *new_seq = cpu_to_le64(++ls->ls_rcom_seq); + set_bit(LSFL_RCOM_WAIT, &ls->ls_flags); + spin_unlock_bh(&ls->ls_rcom_spin); +} + +static void disallow_sync_reply(struct dlm_ls *ls) +{ + spin_lock_bh(&ls->ls_rcom_spin); + clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); + clear_bit(LSFL_RCOM_READY, &ls->ls_flags); + spin_unlock_bh(&ls->ls_rcom_spin); +} + +/* + * low nodeid gathers one slot value at a time from each node. + * it sets need_slots=0, and saves rf_our_slot returned from each + * rcom_config. + * + * other nodes gather all slot values at once from the low nodeid. + * they set need_slots=1, and ignore the rf_our_slot returned from each + * rcom_config. they use the rf_num_slots returned from the low + * node's rcom_config. + */ + +int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags, + uint64_t seq) +{ + struct dlm_rcom *rc; + struct dlm_msg *msg; + int error = 0; + + ls->ls_recover_nodeid = nodeid; + + if (nodeid == dlm_our_nodeid()) { + rc = ls->ls_recover_buf; + rc->rc_result = cpu_to_le32(dlm_recover_status(ls)); + goto out; + } + +retry: + error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS, + sizeof(struct rcom_status), &rc, &msg, + seq); + if (error) + goto out; + + set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags); + + allow_sync_reply(ls, &rc->rc_id); + memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE); + + send_rcom_stateless(msg, rc); + + error = dlm_wait_function(ls, &rcom_response); + disallow_sync_reply(ls); + if (error == -ETIMEDOUT) + goto retry; + if (error) + goto out; + + rc = ls->ls_recover_buf; + + if (rc->rc_result == cpu_to_le32(-ESRCH)) { + /* we pretend the remote lockspace exists with 0 status */ + log_debug(ls, "remote node %d not ready", nodeid); + rc->rc_result = 0; + error = 0; + } else { + error = check_rcom_config(ls, rc, nodeid); + } + + /* the caller looks at rc_result for the remote recovery status */ + out: + return error; +} + +static void receive_rcom_status(struct dlm_ls *ls, + const struct dlm_rcom *rc_in, + uint64_t seq) +{ + struct dlm_rcom *rc; + struct rcom_status *rs; + uint32_t status; + int nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid); + int len = sizeof(struct rcom_config); + struct dlm_msg *msg; + int num_slots = 0; + int error; + + if (!dlm_slots_version(&rc_in->rc_header)) { + status = dlm_recover_status(ls); + goto do_create; + } + + rs = (struct rcom_status *)rc_in->rc_buf; + + if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) { + status = dlm_recover_status(ls); + goto do_create; + } + + spin_lock_bh(&ls->ls_recover_lock); + status = ls->ls_recover_status; + num_slots = ls->ls_num_slots; + spin_unlock_bh(&ls->ls_recover_lock); + len += num_slots * sizeof(struct rcom_slot); + + do_create: + error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY, + len, &rc, &msg, seq); + if (error) + return; + + rc->rc_id = rc_in->rc_id; + rc->rc_seq_reply = rc_in->rc_seq; + rc->rc_result = cpu_to_le32(status); + + set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots); + + if (!num_slots) + goto do_send; + + spin_lock_bh(&ls->ls_recover_lock); + if (ls->ls_num_slots != num_slots) { + spin_unlock_bh(&ls->ls_recover_lock); + log_debug(ls, "receive_rcom_status num_slots %d to %d", + num_slots, ls->ls_num_slots); + rc->rc_result = 0; + set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0); + goto do_send; + } + + dlm_slots_copy_out(ls, rc); + spin_unlock_bh(&ls->ls_recover_lock); + + do_send: + send_rcom_stateless(msg, rc); +} + +static void receive_sync_reply(struct dlm_ls *ls, const struct dlm_rcom *rc_in) +{ + spin_lock_bh(&ls->ls_rcom_spin); + if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) || + le64_to_cpu(rc_in->rc_id) != ls->ls_rcom_seq) { + log_debug(ls, "reject reply %d from %d seq %llx expect %llx", + le32_to_cpu(rc_in->rc_type), + le32_to_cpu(rc_in->rc_header.h_nodeid), + (unsigned long long)le64_to_cpu(rc_in->rc_id), + (unsigned long long)ls->ls_rcom_seq); + goto out; + } + memcpy(ls->ls_recover_buf, rc_in, + le16_to_cpu(rc_in->rc_header.h_length)); + set_bit(LSFL_RCOM_READY, &ls->ls_flags); + clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); + wake_up(&ls->ls_wait_general); + out: + spin_unlock_bh(&ls->ls_rcom_spin); +} + +int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, + int last_len, uint64_t seq) +{ + struct dlm_mhandle *mh; + struct dlm_rcom *rc; + int error = 0; + + ls->ls_recover_nodeid = nodeid; + +retry: + error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, + &rc, &mh, seq); + if (error) + goto out; + memcpy(rc->rc_buf, last_name, last_len); + + allow_sync_reply(ls, &rc->rc_id); + memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE); + + send_rcom(mh, rc); + + error = dlm_wait_function(ls, &rcom_response); + disallow_sync_reply(ls); + if (error == -ETIMEDOUT) + goto retry; + out: + return error; +} + +static void receive_rcom_names(struct dlm_ls *ls, const struct dlm_rcom *rc_in, + uint64_t seq) +{ + struct dlm_mhandle *mh; + struct dlm_rcom *rc; + int error, inlen, outlen, nodeid; + + nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid); + inlen = le16_to_cpu(rc_in->rc_header.h_length) - + sizeof(struct dlm_rcom); + outlen = DLM_MAX_APP_BUFSIZE - sizeof(struct dlm_rcom); + + error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, + &rc, &mh, seq); + if (error) + return; + rc->rc_id = rc_in->rc_id; + rc->rc_seq_reply = rc_in->rc_seq; + + dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen, + nodeid); + send_rcom(mh, rc); +} + +int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid, uint64_t seq) +{ + struct dlm_rcom *rc; + struct dlm_mhandle *mh; + struct dlm_ls *ls = r->res_ls; + int error; + + error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length, + &rc, &mh, seq); + if (error) + goto out; + memcpy(rc->rc_buf, r->res_name, r->res_length); + rc->rc_id = cpu_to_le64(r->res_id); + + send_rcom(mh, rc); + out: + return error; +} + +static void receive_rcom_lookup(struct dlm_ls *ls, + const struct dlm_rcom *rc_in, uint64_t seq) +{ + struct dlm_rcom *rc; + struct dlm_mhandle *mh; + int error, ret_nodeid, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid); + int len = le16_to_cpu(rc_in->rc_header.h_length) - + sizeof(struct dlm_rcom); + + /* Old code would send this special id to trigger a debug dump. */ + if (rc_in->rc_id == cpu_to_le64(0xFFFFFFFF)) { + log_error(ls, "receive_rcom_lookup dump from %d", nodeid); + dlm_dump_rsb_name(ls, rc_in->rc_buf, len); + return; + } + + error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh, + seq); + if (error) + return; + + error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len, + DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL); + if (error) + ret_nodeid = error; + rc->rc_result = cpu_to_le32(ret_nodeid); + rc->rc_id = rc_in->rc_id; + rc->rc_seq_reply = rc_in->rc_seq; + + send_rcom(mh, rc); +} + +static void receive_rcom_lookup_reply(struct dlm_ls *ls, + const struct dlm_rcom *rc_in) +{ + dlm_recover_master_reply(ls, rc_in); +} + +static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, + struct rcom_lock *rl) +{ + memset(rl, 0, sizeof(*rl)); + + rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid); + rl->rl_lkid = cpu_to_le32(lkb->lkb_id); + rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags); + rl->rl_flags = cpu_to_le32(dlm_dflags_val(lkb)); + rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq); + rl->rl_rqmode = lkb->lkb_rqmode; + rl->rl_grmode = lkb->lkb_grmode; + rl->rl_status = lkb->lkb_status; + rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type); + + if (lkb->lkb_bastfn) + rl->rl_asts |= DLM_CB_BAST; + if (lkb->lkb_astfn) + rl->rl_asts |= DLM_CB_CAST; + + rl->rl_namelen = cpu_to_le16(r->res_length); + memcpy(rl->rl_name, r->res_name, r->res_length); + + /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ? + If so, receive_rcom_lock_args() won't take this copy. */ + + if (lkb->lkb_lvbptr) + memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); +} + +int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, uint64_t seq) +{ + struct dlm_ls *ls = r->res_ls; + struct dlm_rcom *rc; + struct dlm_mhandle *mh; + struct rcom_lock *rl; + int error, len = sizeof(struct rcom_lock); + + if (lkb->lkb_lvbptr) + len += ls->ls_lvblen; + + error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh, + seq); + if (error) + goto out; + + rl = (struct rcom_lock *) rc->rc_buf; + pack_rcom_lock(r, lkb, rl); + rc->rc_id = cpu_to_le64((uintptr_t)r); + + send_rcom(mh, rc); + out: + return error; +} + +/* needs at least dlm_rcom + rcom_lock */ +static void receive_rcom_lock(struct dlm_ls *ls, const struct dlm_rcom *rc_in, + uint64_t seq) +{ + __le32 rl_remid, rl_result; + struct rcom_lock *rl; + struct dlm_rcom *rc; + struct dlm_mhandle *mh; + int error, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid); + + dlm_recover_master_copy(ls, rc_in, &rl_remid, &rl_result); + + error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY, + sizeof(struct rcom_lock), &rc, &mh, seq); + if (error) + return; + + memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock)); + rl = (struct rcom_lock *)rc->rc_buf; + /* set rl_remid and rl_result from dlm_recover_master_copy() */ + rl->rl_remid = rl_remid; + rl->rl_result = rl_result; + + rc->rc_id = rc_in->rc_id; + rc->rc_seq_reply = rc_in->rc_seq; + + send_rcom(mh, rc); +} + +/* If the lockspace doesn't exist then still send a status message + back; it's possible that it just doesn't have its global_id yet. */ + +int dlm_send_ls_not_ready(int nodeid, const struct dlm_rcom *rc_in) +{ + struct dlm_rcom *rc; + struct rcom_config *rf; + struct dlm_mhandle *mh; + char *mb; + int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config); + + mh = dlm_midcomms_get_mhandle(nodeid, mb_len, &mb); + if (!mh) + return -ENOBUFS; + + rc = (struct dlm_rcom *) mb; + + rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR); + rc->rc_header.u.h_lockspace = rc_in->rc_header.u.h_lockspace; + rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid()); + rc->rc_header.h_length = cpu_to_le16(mb_len); + rc->rc_header.h_cmd = DLM_RCOM; + + rc->rc_type = cpu_to_le32(DLM_RCOM_STATUS_REPLY); + rc->rc_id = rc_in->rc_id; + rc->rc_seq_reply = rc_in->rc_seq; + rc->rc_result = cpu_to_le32(-ESRCH); + + rf = (struct rcom_config *) rc->rc_buf; + rf->rf_lvblen = cpu_to_le32(~0U); + + dlm_midcomms_commit_mhandle(mh, NULL, 0); + + return 0; +} + +/* + * Ignore messages for stage Y before we set + * recover_status bit for stage X: + * + * recover_status = 0 + * + * dlm_recover_members() + * - send nothing + * - recv nothing + * - ignore NAMES, NAMES_REPLY + * - ignore LOOKUP, LOOKUP_REPLY + * - ignore LOCK, LOCK_REPLY + * + * recover_status |= NODES + * + * dlm_recover_members_wait() + * + * dlm_recover_directory() + * - send NAMES + * - recv NAMES_REPLY + * - ignore LOOKUP, LOOKUP_REPLY + * - ignore LOCK, LOCK_REPLY + * + * recover_status |= DIR + * + * dlm_recover_directory_wait() + * + * dlm_recover_masters() + * - send LOOKUP + * - recv LOOKUP_REPLY + * + * dlm_recover_locks() + * - send LOCKS + * - recv LOCKS_REPLY + * + * recover_status |= LOCKS + * + * dlm_recover_locks_wait() + * + * recover_status |= DONE + */ + +/* Called by dlm_recv; corresponds to dlm_receive_message() but special + recovery-only comms are sent through here. */ + +void dlm_receive_rcom(struct dlm_ls *ls, const struct dlm_rcom *rc, int nodeid) +{ + int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock); + int stop, reply = 0, names = 0, lookup = 0, lock = 0; + uint32_t status; + uint64_t seq; + + switch (rc->rc_type) { + case cpu_to_le32(DLM_RCOM_STATUS_REPLY): + reply = 1; + break; + case cpu_to_le32(DLM_RCOM_NAMES): + names = 1; + break; + case cpu_to_le32(DLM_RCOM_NAMES_REPLY): + names = 1; + reply = 1; + break; + case cpu_to_le32(DLM_RCOM_LOOKUP): + lookup = 1; + break; + case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY): + lookup = 1; + reply = 1; + break; + case cpu_to_le32(DLM_RCOM_LOCK): + lock = 1; + break; + case cpu_to_le32(DLM_RCOM_LOCK_REPLY): + lock = 1; + reply = 1; + break; + } + + spin_lock_bh(&ls->ls_recover_lock); + status = ls->ls_recover_status; + stop = dlm_recovery_stopped(ls); + seq = ls->ls_recover_seq; + spin_unlock_bh(&ls->ls_recover_lock); + + if (stop && (rc->rc_type != cpu_to_le32(DLM_RCOM_STATUS))) + goto ignore; + + if (reply && (le64_to_cpu(rc->rc_seq_reply) != seq)) + goto ignore; + + if (!(status & DLM_RS_NODES) && (names || lookup || lock)) + goto ignore; + + if (!(status & DLM_RS_DIR) && (lookup || lock)) + goto ignore; + + switch (rc->rc_type) { + case cpu_to_le32(DLM_RCOM_STATUS): + receive_rcom_status(ls, rc, seq); + break; + + case cpu_to_le32(DLM_RCOM_NAMES): + receive_rcom_names(ls, rc, seq); + break; + + case cpu_to_le32(DLM_RCOM_LOOKUP): + receive_rcom_lookup(ls, rc, seq); + break; + + case cpu_to_le32(DLM_RCOM_LOCK): + if (le16_to_cpu(rc->rc_header.h_length) < lock_size) + goto Eshort; + receive_rcom_lock(ls, rc, seq); + break; + + case cpu_to_le32(DLM_RCOM_STATUS_REPLY): + receive_sync_reply(ls, rc); + break; + + case cpu_to_le32(DLM_RCOM_NAMES_REPLY): + receive_sync_reply(ls, rc); + break; + + case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY): + receive_rcom_lookup_reply(ls, rc); + break; + + case cpu_to_le32(DLM_RCOM_LOCK_REPLY): + if (le16_to_cpu(rc->rc_header.h_length) < lock_size) + goto Eshort; + dlm_recover_process_copy(ls, rc, seq); + break; + + default: + log_error(ls, "receive_rcom bad type %d", + le32_to_cpu(rc->rc_type)); + } + return; + +ignore: + log_limit(ls, "dlm_receive_rcom ignore msg %d " + "from %d %llu %llu recover seq %llu sts %x gen %u", + le32_to_cpu(rc->rc_type), + nodeid, + (unsigned long long)le64_to_cpu(rc->rc_seq), + (unsigned long long)le64_to_cpu(rc->rc_seq_reply), + (unsigned long long)seq, + status, ls->ls_generation); + return; +Eshort: + log_error(ls, "recovery message %d from %d is too short", + le32_to_cpu(rc->rc_type), nodeid); +} + -- cgit v1.3.1