diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/dlm/dlmrecovery.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/dlm/dlmrecovery.c | 2886 |
1 files changed, 0 insertions, 2886 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/dlm/dlmrecovery.c b/ANDROID_3.4.5/fs/ocfs2/dlm/dlmrecovery.c deleted file mode 100644 index 01ebfd0b..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/dlm/dlmrecovery.c +++ /dev/null @@ -1,2886 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * dlmrecovery.c - * - * recovery stuff - * - * Copyright (C) 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - */ - - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/highmem.h> -#include <linux/init.h> -#include <linux/sysctl.h> -#include <linux/random.h> -#include <linux/blkdev.h> -#include <linux/socket.h> -#include <linux/inet.h> -#include <linux/timer.h> -#include <linux/kthread.h> -#include <linux/delay.h> - - -#include "cluster/heartbeat.h" -#include "cluster/nodemanager.h" -#include "cluster/tcp.h" - -#include "dlmapi.h" -#include "dlmcommon.h" -#include "dlmdomain.h" - -#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY) -#include "cluster/masklog.h" - -static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node); - -static int dlm_recovery_thread(void *data); -void dlm_complete_recovery_thread(struct dlm_ctxt *dlm); -int dlm_launch_recovery_thread(struct dlm_ctxt *dlm); -void dlm_kick_recovery_thread(struct dlm_ctxt *dlm); -static int dlm_do_recovery(struct dlm_ctxt *dlm); - -static int dlm_pick_recovery_master(struct dlm_ctxt *dlm); -static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node); -static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node); -static int dlm_request_all_locks(struct dlm_ctxt *dlm, - u8 request_from, u8 dead_node); -static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node); - -static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res); -static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres, - const char *lockname, int namelen, - int total_locks, u64 cookie, - u8 flags, u8 master); -static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm, - struct dlm_migratable_lockres *mres, - u8 send_to, - struct dlm_lock_resource *res, - int total_locks); -static int dlm_process_recovery_data(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res, - struct dlm_migratable_lockres *mres); -static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm); -static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, - u8 dead_node, u8 send_to); -static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node); -static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm, - struct list_head *list, u8 dead_node); -static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm, - u8 dead_node, u8 new_master); -static void dlm_reco_ast(void *astdata); -static void dlm_reco_bast(void *astdata, int blocked_type); -static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st); -static void dlm_request_all_locks_worker(struct dlm_work_item *item, - void *data); -static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data); -static int dlm_lockres_master_requery(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res, - u8 *real_master); - -static u64 dlm_get_next_mig_cookie(void); - -static DEFINE_SPINLOCK(dlm_reco_state_lock); -static DEFINE_SPINLOCK(dlm_mig_cookie_lock); -static u64 dlm_mig_cookie = 1; - -static u64 dlm_get_next_mig_cookie(void) -{ - u64 c; - spin_lock(&dlm_mig_cookie_lock); - c = dlm_mig_cookie; - if (dlm_mig_cookie == (~0ULL)) - dlm_mig_cookie = 1; - else - dlm_mig_cookie++; - spin_unlock(&dlm_mig_cookie_lock); - return c; -} - -static inline void dlm_set_reco_dead_node(struct dlm_ctxt *dlm, - u8 dead_node) -{ - assert_spin_locked(&dlm->spinlock); - if (dlm->reco.dead_node != dead_node) - mlog(0, "%s: changing dead_node from %u to %u\n", - dlm->name, dlm->reco.dead_node, dead_node); - dlm->reco.dead_node = dead_node; -} - -static inline void dlm_set_reco_master(struct dlm_ctxt *dlm, - u8 master) -{ - assert_spin_locked(&dlm->spinlock); - mlog(0, "%s: changing new_master from %u to %u\n", - dlm->name, dlm->reco.new_master, master); - dlm->reco.new_master = master; -} - -static inline void __dlm_reset_recovery(struct dlm_ctxt *dlm) -{ - assert_spin_locked(&dlm->spinlock); - clear_bit(dlm->reco.dead_node, dlm->recovery_map); - dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM); - dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM); -} - -static inline void dlm_reset_recovery(struct dlm_ctxt *dlm) -{ - spin_lock(&dlm->spinlock); - __dlm_reset_recovery(dlm); - spin_unlock(&dlm->spinlock); -} - -/* Worker function used during recovery. */ -void dlm_dispatch_work(struct work_struct *work) -{ - struct dlm_ctxt *dlm = - container_of(work, struct dlm_ctxt, dispatched_work); - LIST_HEAD(tmp_list); - struct dlm_work_item *item, *next; - dlm_workfunc_t *workfunc; - int tot=0; - - spin_lock(&dlm->work_lock); - list_splice_init(&dlm->work_list, &tmp_list); - spin_unlock(&dlm->work_lock); - - list_for_each_entry(item, &tmp_list, list) { - tot++; - } - mlog(0, "%s: work thread has %d work items\n", dlm->name, tot); - - list_for_each_entry_safe(item, next, &tmp_list, list) { - workfunc = item->func; - list_del_init(&item->list); - - /* already have ref on dlm to avoid having - * it disappear. just double-check. */ - BUG_ON(item->dlm != dlm); - - /* this is allowed to sleep and - * call network stuff */ - workfunc(item, item->data); - - dlm_put(dlm); - kfree(item); - } -} - -/* - * RECOVERY THREAD - */ - -void dlm_kick_recovery_thread(struct dlm_ctxt *dlm) -{ - /* wake the recovery thread - * this will wake the reco thread in one of three places - * 1) sleeping with no recovery happening - * 2) sleeping with recovery mastered elsewhere - * 3) recovery mastered here, waiting on reco data */ - - wake_up(&dlm->dlm_reco_thread_wq); -} - -/* Launch the recovery thread */ -int dlm_launch_recovery_thread(struct dlm_ctxt *dlm) -{ - mlog(0, "starting dlm recovery thread...\n"); - - dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm, - "dlm_reco_thread"); - if (IS_ERR(dlm->dlm_reco_thread_task)) { - mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task)); - dlm->dlm_reco_thread_task = NULL; - return -EINVAL; - } - - return 0; -} - -void dlm_complete_recovery_thread(struct dlm_ctxt *dlm) -{ - if (dlm->dlm_reco_thread_task) { - mlog(0, "waiting for dlm recovery thread to exit\n"); - kthread_stop(dlm->dlm_reco_thread_task); - dlm->dlm_reco_thread_task = NULL; - } -} - - - -/* - * this is lame, but here's how recovery works... - * 1) all recovery threads cluster wide will work on recovering - * ONE node at a time - * 2) negotiate who will take over all the locks for the dead node. - * thats right... ALL the locks. - * 3) once a new master is chosen, everyone scans all locks - * and moves aside those mastered by the dead guy - * 4) each of these locks should be locked until recovery is done - * 5) the new master collects up all of secondary lock queue info - * one lock at a time, forcing each node to communicate back - * before continuing - * 6) each secondary lock queue responds with the full known lock info - * 7) once the new master has run all its locks, it sends a ALLDONE! - * message to everyone - * 8) upon receiving this message, the secondary queue node unlocks - * and responds to the ALLDONE - * 9) once the new master gets responses from everyone, he unlocks - * everything and recovery for this dead node is done - *10) go back to 2) while there are still dead nodes - * - */ - -static void dlm_print_reco_node_status(struct dlm_ctxt *dlm) -{ - struct dlm_reco_node_data *ndata; - struct dlm_lock_resource *res; - - mlog(ML_NOTICE, "%s(%d): recovery info, state=%s, dead=%u, master=%u\n", - dlm->name, task_pid_nr(dlm->dlm_reco_thread_task), - dlm->reco.state & DLM_RECO_STATE_ACTIVE ? "ACTIVE" : "inactive", - dlm->reco.dead_node, dlm->reco.new_master); - - list_for_each_entry(ndata, &dlm->reco.node_data, list) { - char *st = "unknown"; - switch (ndata->state) { - case DLM_RECO_NODE_DATA_INIT: - st = "init"; - break; - case DLM_RECO_NODE_DATA_REQUESTING: - st = "requesting"; - break; - case DLM_RECO_NODE_DATA_DEAD: - st = "dead"; - break; - case DLM_RECO_NODE_DATA_RECEIVING: - st = "receiving"; - break; - case DLM_RECO_NODE_DATA_REQUESTED: - st = "requested"; - break; - case DLM_RECO_NODE_DATA_DONE: - st = "done"; - break; - case DLM_RECO_NODE_DATA_FINALIZE_SENT: - st = "finalize-sent"; - break; - default: - st = "bad"; - break; - } - mlog(ML_NOTICE, "%s: reco state, node %u, state=%s\n", - dlm->name, ndata->node_num, st); - } - list_for_each_entry(res, &dlm->reco.resources, recovering) { - mlog(ML_NOTICE, "%s: lockres %.*s on recovering list\n", - dlm->name, res->lockname.len, res->lockname.name); - } -} - -#define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000) - -static int dlm_recovery_thread(void *data) -{ - int status; - struct dlm_ctxt *dlm = data; - unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS); - - mlog(0, "dlm thread running for %s...\n", dlm->name); - - while (!kthread_should_stop()) { - if (dlm_domain_fully_joined(dlm)) { - status = dlm_do_recovery(dlm); - if (status == -EAGAIN) { - /* do not sleep, recheck immediately. */ - continue; - } - if (status < 0) - mlog_errno(status); - } - - wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq, - kthread_should_stop(), - timeout); - } - - mlog(0, "quitting DLM recovery thread\n"); - return 0; -} - -/* returns true when the recovery master has contacted us */ -static int dlm_reco_master_ready(struct dlm_ctxt *dlm) -{ - int ready; - spin_lock(&dlm->spinlock); - ready = (dlm->reco.new_master != O2NM_INVALID_NODE_NUM); - spin_unlock(&dlm->spinlock); - return ready; -} - -/* returns true if node is no longer in the domain - * could be dead or just not joined */ -int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node) -{ - int dead; - spin_lock(&dlm->spinlock); - dead = !test_bit(node, dlm->domain_map); - spin_unlock(&dlm->spinlock); - return dead; -} - -/* returns true if node is no longer in the domain - * could be dead or just not joined */ -static int dlm_is_node_recovered(struct dlm_ctxt *dlm, u8 node) -{ - int recovered; - spin_lock(&dlm->spinlock); - recovered = !test_bit(node, dlm->recovery_map); - spin_unlock(&dlm->spinlock); - return recovered; -} - - -void dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout) -{ - if (dlm_is_node_dead(dlm, node)) - return; - - printk(KERN_NOTICE "o2dlm: Waiting on the death of node %u in " - "domain %s\n", node, dlm->name); - - if (timeout) - wait_event_timeout(dlm->dlm_reco_thread_wq, - dlm_is_node_dead(dlm, node), - msecs_to_jiffies(timeout)); - else - wait_event(dlm->dlm_reco_thread_wq, - dlm_is_node_dead(dlm, node)); -} - -void dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout) -{ - if (dlm_is_node_recovered(dlm, node)) - return; - - printk(KERN_NOTICE "o2dlm: Waiting on the recovery of node %u in " - "domain %s\n", node, dlm->name); - - if (timeout) - wait_event_timeout(dlm->dlm_reco_thread_wq, - dlm_is_node_recovered(dlm, node), - msecs_to_jiffies(timeout)); - else - wait_event(dlm->dlm_reco_thread_wq, - dlm_is_node_recovered(dlm, node)); -} - -/* callers of the top-level api calls (dlmlock/dlmunlock) should - * block on the dlm->reco.event when recovery is in progress. - * the dlm recovery thread will set this state when it begins - * recovering a dead node (as the new master or not) and clear - * the state and wake as soon as all affected lock resources have - * been marked with the RECOVERY flag */ -static int dlm_in_recovery(struct dlm_ctxt *dlm) -{ - int in_recovery; - spin_lock(&dlm->spinlock); - in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE); - spin_unlock(&dlm->spinlock); - return in_recovery; -} - - -void dlm_wait_for_recovery(struct dlm_ctxt *dlm) -{ - if (dlm_in_recovery(dlm)) { - mlog(0, "%s: reco thread %d in recovery: " - "state=%d, master=%u, dead=%u\n", - dlm->name, task_pid_nr(dlm->dlm_reco_thread_task), - dlm->reco.state, dlm->reco.new_master, - dlm->reco.dead_node); - } - wait_event(dlm->reco.event, !dlm_in_recovery(dlm)); -} - -static void dlm_begin_recovery(struct dlm_ctxt *dlm) -{ - spin_lock(&dlm->spinlock); - BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE); - printk(KERN_NOTICE "o2dlm: Begin recovery on domain %s for node %u\n", - dlm->name, dlm->reco.dead_node); - dlm->reco.state |= DLM_RECO_STATE_ACTIVE; - spin_unlock(&dlm->spinlock); -} - -static void dlm_end_recovery(struct dlm_ctxt *dlm) -{ - spin_lock(&dlm->spinlock); - BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE)); - dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE; - spin_unlock(&dlm->spinlock); - printk(KERN_NOTICE "o2dlm: End recovery on domain %s\n", dlm->name); - wake_up(&dlm->reco.event); -} - -static void dlm_print_recovery_master(struct dlm_ctxt *dlm) -{ - printk(KERN_NOTICE "o2dlm: Node %u (%s) is the Recovery Master for the " - "dead node %u in domain %s\n", dlm->reco.new_master, - (dlm->node_num == dlm->reco.new_master ? "me" : "he"), - dlm->reco.dead_node, dlm->name); -} - -static int dlm_do_recovery(struct dlm_ctxt *dlm) -{ - int status = 0; - int ret; - - spin_lock(&dlm->spinlock); - - /* check to see if the new master has died */ - if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM && - test_bit(dlm->reco.new_master, dlm->recovery_map)) { - mlog(0, "new master %u died while recovering %u!\n", - dlm->reco.new_master, dlm->reco.dead_node); - /* unset the new_master, leave dead_node */ - dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM); - } - - /* select a target to recover */ - if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { - int bit; - - bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES, 0); - if (bit >= O2NM_MAX_NODES || bit < 0) - dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM); - else - dlm_set_reco_dead_node(dlm, bit); - } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) { - /* BUG? */ - mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n", - dlm->reco.dead_node); - dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM); - } - - if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { - // mlog(0, "nothing to recover! sleeping now!\n"); - spin_unlock(&dlm->spinlock); - /* return to main thread loop and sleep. */ - return 0; - } - mlog(0, "%s(%d):recovery thread found node %u in the recovery map!\n", - dlm->name, task_pid_nr(dlm->dlm_reco_thread_task), - dlm->reco.dead_node); - spin_unlock(&dlm->spinlock); - - /* take write barrier */ - /* (stops the list reshuffling thread, proxy ast handling) */ - dlm_begin_recovery(dlm); - - if (dlm->reco.new_master == dlm->node_num) - goto master_here; - - if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) { - /* choose a new master, returns 0 if this node - * is the master, -EEXIST if it's another node. - * this does not return until a new master is chosen - * or recovery completes entirely. */ - ret = dlm_pick_recovery_master(dlm); - if (!ret) { - /* already notified everyone. go. */ - goto master_here; - } - mlog(0, "another node will master this recovery session.\n"); - } - - dlm_print_recovery_master(dlm); - - /* it is safe to start everything back up here - * because all of the dead node's lock resources - * have been marked as in-recovery */ - dlm_end_recovery(dlm); - - /* sleep out in main dlm_recovery_thread loop. */ - return 0; - -master_here: - dlm_print_recovery_master(dlm); - - status = dlm_remaster_locks(dlm, dlm->reco.dead_node); - if (status < 0) { - /* we should never hit this anymore */ - mlog(ML_ERROR, "%s: Error %d remastering locks for node %u, " - "retrying.\n", dlm->name, status, dlm->reco.dead_node); - /* yield a bit to allow any final network messages - * to get handled on remaining nodes */ - msleep(100); - } else { - /* success! see if any other nodes need recovery */ - mlog(0, "DONE mastering recovery of %s:%u here(this=%u)!\n", - dlm->name, dlm->reco.dead_node, dlm->node_num); - dlm_reset_recovery(dlm); - } - dlm_end_recovery(dlm); - - /* continue and look for another dead node */ - return -EAGAIN; -} - -static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node) -{ - int status = 0; - struct dlm_reco_node_data *ndata; - int all_nodes_done; - int destroy = 0; - int pass = 0; - - do { - /* we have become recovery master. there is no escaping - * this, so just keep trying until we get it. */ - status = dlm_init_recovery_area(dlm, dead_node); - if (status < 0) { - mlog(ML_ERROR, "%s: failed to alloc recovery area, " - "retrying\n", dlm->name); - msleep(1000); - } - } while (status != 0); - - /* safe to access the node data list without a lock, since this - * process is the only one to change the list */ - list_for_each_entry(ndata, &dlm->reco.node_data, list) { - BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT); - ndata->state = DLM_RECO_NODE_DATA_REQUESTING; - - mlog(0, "%s: Requesting lock info from node %u\n", dlm->name, - ndata->node_num); - - if (ndata->node_num == dlm->node_num) { - ndata->state = DLM_RECO_NODE_DATA_DONE; - continue; - } - - do { - status = dlm_request_all_locks(dlm, ndata->node_num, - dead_node); - if (status < 0) { - mlog_errno(status); - if (dlm_is_host_down(status)) { - /* node died, ignore it for recovery */ - status = 0; - ndata->state = DLM_RECO_NODE_DATA_DEAD; - /* wait for the domain map to catch up - * with the network state. */ - wait_event_timeout(dlm->dlm_reco_thread_wq, - dlm_is_node_dead(dlm, - ndata->node_num), - msecs_to_jiffies(1000)); - mlog(0, "waited 1 sec for %u, " - "dead? %s\n", ndata->node_num, - dlm_is_node_dead(dlm, ndata->node_num) ? - "yes" : "no"); - } else { - /* -ENOMEM on the other node */ - mlog(0, "%s: node %u returned " - "%d during recovery, retrying " - "after a short wait\n", - dlm->name, ndata->node_num, - status); - msleep(100); - } - } - } while (status != 0); - - spin_lock(&dlm_reco_state_lock); - switch (ndata->state) { - case DLM_RECO_NODE_DATA_INIT: - case DLM_RECO_NODE_DATA_FINALIZE_SENT: - case DLM_RECO_NODE_DATA_REQUESTED: - BUG(); - break; - case DLM_RECO_NODE_DATA_DEAD: - mlog(0, "node %u died after requesting " - "recovery info for node %u\n", - ndata->node_num, dead_node); - /* fine. don't need this node's info. - * continue without it. */ - break; - case DLM_RECO_NODE_DATA_REQUESTING: - ndata->state = DLM_RECO_NODE_DATA_REQUESTED; - mlog(0, "now receiving recovery data from " - "node %u for dead node %u\n", - ndata->node_num, dead_node); - break; - case DLM_RECO_NODE_DATA_RECEIVING: - mlog(0, "already receiving recovery data from " - "node %u for dead node %u\n", - ndata->node_num, dead_node); - break; - case DLM_RECO_NODE_DATA_DONE: - mlog(0, "already DONE receiving recovery data " - "from node %u for dead node %u\n", - ndata->node_num, dead_node); - break; - } - spin_unlock(&dlm_reco_state_lock); - } - - mlog(0, "%s: Done requesting all lock info\n", dlm->name); - - /* nodes should be sending reco data now - * just need to wait */ - - while (1) { - /* check all the nodes now to see if we are - * done, or if anyone died */ - all_nodes_done = 1; - spin_lock(&dlm_reco_state_lock); - list_for_each_entry(ndata, &dlm->reco.node_data, list) { - mlog(0, "checking recovery state of node %u\n", - ndata->node_num); - switch (ndata->state) { - case DLM_RECO_NODE_DATA_INIT: - case DLM_RECO_NODE_DATA_REQUESTING: - mlog(ML_ERROR, "bad ndata state for " - "node %u: state=%d\n", - ndata->node_num, ndata->state); - BUG(); - break; - case DLM_RECO_NODE_DATA_DEAD: - mlog(0, "node %u died after " - "requesting recovery info for " - "node %u\n", ndata->node_num, - dead_node); - break; - case DLM_RECO_NODE_DATA_RECEIVING: - case DLM_RECO_NODE_DATA_REQUESTED: - mlog(0, "%s: node %u still in state %s\n", - dlm->name, ndata->node_num, - ndata->state==DLM_RECO_NODE_DATA_RECEIVING ? - "receiving" : "requested"); - all_nodes_done = 0; - break; - case DLM_RECO_NODE_DATA_DONE: - mlog(0, "%s: node %u state is done\n", - dlm->name, ndata->node_num); - break; - case DLM_RECO_NODE_DATA_FINALIZE_SENT: - mlog(0, "%s: node %u state is finalize\n", - dlm->name, ndata->node_num); - break; - } - } - spin_unlock(&dlm_reco_state_lock); - - mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass, - all_nodes_done?"yes":"no"); - if (all_nodes_done) { - int ret; - - /* all nodes are now in DLM_RECO_NODE_DATA_DONE state - * just send a finalize message to everyone and - * clean up */ - mlog(0, "all nodes are done! send finalize\n"); - ret = dlm_send_finalize_reco_message(dlm); - if (ret < 0) - mlog_errno(ret); - - spin_lock(&dlm->spinlock); - dlm_finish_local_lockres_recovery(dlm, dead_node, - dlm->node_num); - spin_unlock(&dlm->spinlock); - mlog(0, "should be done with recovery!\n"); - - mlog(0, "finishing recovery of %s at %lu, " - "dead=%u, this=%u, new=%u\n", dlm->name, - jiffies, dlm->reco.dead_node, - dlm->node_num, dlm->reco.new_master); - destroy = 1; - status = 0; - /* rescan everything marked dirty along the way */ - dlm_kick_thread(dlm, NULL); - break; - } - /* wait to be signalled, with periodic timeout - * to check for node death */ - wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq, - kthread_should_stop(), - msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS)); - - } - - if (destroy) - dlm_destroy_recovery_area(dlm, dead_node); - - return status; -} - -static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node) -{ - int num=0; - struct dlm_reco_node_data *ndata; - - spin_lock(&dlm->spinlock); - memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map)); - /* nodes can only be removed (by dying) after dropping - * this lock, and death will be trapped later, so this should do */ - spin_unlock(&dlm->spinlock); - - while (1) { - num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num); - if (num >= O2NM_MAX_NODES) { - break; - } - BUG_ON(num == dead_node); - - ndata = kzalloc(sizeof(*ndata), GFP_NOFS); - if (!ndata) { - dlm_destroy_recovery_area(dlm, dead_node); - return -ENOMEM; - } - ndata->node_num = num; - ndata->state = DLM_RECO_NODE_DATA_INIT; - spin_lock(&dlm_reco_state_lock); - list_add_tail(&ndata->list, &dlm->reco.node_data); - spin_unlock(&dlm_reco_state_lock); - num++; - } - - return 0; -} - -static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node) -{ - struct dlm_reco_node_data *ndata, *next; - LIST_HEAD(tmplist); - - spin_lock(&dlm_reco_state_lock); - list_splice_init(&dlm->reco.node_data, &tmplist); - spin_unlock(&dlm_reco_state_lock); - - list_for_each_entry_safe(ndata, next, &tmplist, list) { - list_del_init(&ndata->list); - kfree(ndata); - } -} - -static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from, - u8 dead_node) -{ - struct dlm_lock_request lr; - enum dlm_status ret; - - mlog(0, "\n"); - - - mlog(0, "dlm_request_all_locks: dead node is %u, sending request " - "to %u\n", dead_node, request_from); - - memset(&lr, 0, sizeof(lr)); - lr.node_idx = dlm->node_num; - lr.dead_node = dead_node; - - // send message - ret = DLM_NOLOCKMGR; - ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key, - &lr, sizeof(lr), request_from, NULL); - - /* negative status is handled by caller */ - if (ret < 0) - mlog(ML_ERROR, "%s: Error %d send LOCK_REQUEST to node %u " - "to recover dead node %u\n", dlm->name, ret, - request_from, dead_node); - // return from here, then - // sleep until all received or error - return ret; - -} - -int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data, - void **ret_data) -{ - struct dlm_ctxt *dlm = data; - struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf; - char *buf = NULL; - struct dlm_work_item *item = NULL; - - if (!dlm_grab(dlm)) - return -EINVAL; - - if (lr->dead_node != dlm->reco.dead_node) { - mlog(ML_ERROR, "%s: node %u sent dead_node=%u, but local " - "dead_node is %u\n", dlm->name, lr->node_idx, - lr->dead_node, dlm->reco.dead_node); - dlm_print_reco_node_status(dlm); - /* this is a hack */ - dlm_put(dlm); - return -ENOMEM; - } - BUG_ON(lr->dead_node != dlm->reco.dead_node); - - item = kzalloc(sizeof(*item), GFP_NOFS); - if (!item) { - dlm_put(dlm); - return -ENOMEM; - } - - /* this will get freed by dlm_request_all_locks_worker */ - buf = (char *) __get_free_page(GFP_NOFS); - if (!buf) { - kfree(item); - dlm_put(dlm); - return -ENOMEM; - } - - /* queue up work for dlm_request_all_locks_worker */ - dlm_grab(dlm); /* get an extra ref for the work item */ - dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf); - item->u.ral.reco_master = lr->node_idx; - item->u.ral.dead_node = lr->dead_node; - spin_lock(&dlm->work_lock); - list_add_tail(&item->list, &dlm->work_list); - spin_unlock(&dlm->work_lock); - queue_work(dlm->dlm_worker, &dlm->dispatched_work); - - dlm_put(dlm); - return 0; -} - -static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data) -{ - struct dlm_migratable_lockres *mres; - struct dlm_lock_resource *res; - struct dlm_ctxt *dlm; - LIST_HEAD(resources); - int ret; - u8 dead_node, reco_master; - int skip_all_done = 0; - - dlm = item->dlm; - dead_node = item->u.ral.dead_node; - reco_master = item->u.ral.reco_master; - mres = (struct dlm_migratable_lockres *)data; - - mlog(0, "%s: recovery worker started, dead=%u, master=%u\n", - dlm->name, dead_node, reco_master); - - if (dead_node != dlm->reco.dead_node || - reco_master != dlm->reco.new_master) { - /* worker could have been created before the recovery master - * died. if so, do not continue, but do not error. */ - if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) { - mlog(ML_NOTICE, "%s: will not send recovery state, " - "recovery master %u died, thread=(dead=%u,mas=%u)" - " current=(dead=%u,mas=%u)\n", dlm->name, - reco_master, dead_node, reco_master, - dlm->reco.dead_node, dlm->reco.new_master); - } else { - mlog(ML_NOTICE, "%s: reco state invalid: reco(dead=%u, " - "master=%u), request(dead=%u, master=%u)\n", - dlm->name, dlm->reco.dead_node, - dlm->reco.new_master, dead_node, reco_master); - } - goto leave; - } - - /* lock resources should have already been moved to the - * dlm->reco.resources list. now move items from that list - * to a temp list if the dead owner matches. note that the - * whole cluster recovers only one node at a time, so we - * can safely move UNKNOWN lock resources for each recovery - * session. */ - dlm_move_reco_locks_to_list(dlm, &resources, dead_node); - - /* now we can begin blasting lockreses without the dlm lock */ - - /* any errors returned will be due to the new_master dying, - * the dlm_reco_thread should detect this */ - list_for_each_entry(res, &resources, recovering) { - ret = dlm_send_one_lockres(dlm, res, mres, reco_master, - DLM_MRES_RECOVERY); - if (ret < 0) { - mlog(ML_ERROR, "%s: node %u went down while sending " - "recovery state for dead node %u, ret=%d\n", dlm->name, - reco_master, dead_node, ret); - skip_all_done = 1; - break; - } - } - - /* move the resources back to the list */ - spin_lock(&dlm->spinlock); - list_splice_init(&resources, &dlm->reco.resources); - spin_unlock(&dlm->spinlock); - - if (!skip_all_done) { - ret = dlm_send_all_done_msg(dlm, dead_node, reco_master); - if (ret < 0) { - mlog(ML_ERROR, "%s: node %u went down while sending " - "recovery all-done for dead node %u, ret=%d\n", - dlm->name, reco_master, dead_node, ret); - } - } -leave: - free_page((unsigned long)data); -} - - -static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to) -{ - int ret, tmpret; - struct dlm_reco_data_done done_msg; - - memset(&done_msg, 0, sizeof(done_msg)); - done_msg.node_idx = dlm->node_num; - done_msg.dead_node = dead_node; - mlog(0, "sending DATA DONE message to %u, " - "my node=%u, dead node=%u\n", send_to, done_msg.node_idx, - done_msg.dead_node); - - ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg, - sizeof(done_msg), send_to, &tmpret); - if (ret < 0) { - mlog(ML_ERROR, "%s: Error %d send RECO_DATA_DONE to node %u " - "to recover dead node %u\n", dlm->name, ret, send_to, - dead_node); - if (!dlm_is_host_down(ret)) { - BUG(); - } - } else - ret = tmpret; - return ret; -} - - -int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data, - void **ret_data) -{ - struct dlm_ctxt *dlm = data; - struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf; - struct dlm_reco_node_data *ndata = NULL; - int ret = -EINVAL; - - if (!dlm_grab(dlm)) - return -EINVAL; - - mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, " - "node_idx=%u, this node=%u\n", done->dead_node, - dlm->reco.dead_node, done->node_idx, dlm->node_num); - - mlog_bug_on_msg((done->dead_node != dlm->reco.dead_node), - "Got DATA DONE: dead_node=%u, reco.dead_node=%u, " - "node_idx=%u, this node=%u\n", done->dead_node, - dlm->reco.dead_node, done->node_idx, dlm->node_num); - - spin_lock(&dlm_reco_state_lock); - list_for_each_entry(ndata, &dlm->reco.node_data, list) { - if (ndata->node_num != done->node_idx) - continue; - - switch (ndata->state) { - /* should have moved beyond INIT but not to FINALIZE yet */ - case DLM_RECO_NODE_DATA_INIT: - case DLM_RECO_NODE_DATA_DEAD: - case DLM_RECO_NODE_DATA_FINALIZE_SENT: - mlog(ML_ERROR, "bad ndata state for node %u:" - " state=%d\n", ndata->node_num, - ndata->state); - BUG(); - break; - /* these states are possible at this point, anywhere along - * the line of recovery */ - case DLM_RECO_NODE_DATA_DONE: - case DLM_RECO_NODE_DATA_RECEIVING: - case DLM_RECO_NODE_DATA_REQUESTED: - case DLM_RECO_NODE_DATA_REQUESTING: - mlog(0, "node %u is DONE sending " - "recovery data!\n", - ndata->node_num); - - ndata->state = DLM_RECO_NODE_DATA_DONE; - ret = 0; - break; - } - } - spin_unlock(&dlm_reco_state_lock); - - /* wake the recovery thread, some node is done */ - if (!ret) - dlm_kick_recovery_thread(dlm); - - if (ret < 0) - mlog(ML_ERROR, "failed to find recovery node data for node " - "%u\n", done->node_idx); - dlm_put(dlm); - - mlog(0, "leaving reco data done handler, ret=%d\n", ret); - return ret; -} - -static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm, - struct list_head *list, - u8 dead_node) -{ - struct dlm_lock_resource *res, *next; - struct dlm_lock *lock; - - spin_lock(&dlm->spinlock); - list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) { - /* always prune any $RECOVERY entries for dead nodes, - * otherwise hangs can occur during later recovery */ - if (dlm_is_recovery_lock(res->lockname.name, - res->lockname.len)) { - spin_lock(&res->spinlock); - list_for_each_entry(lock, &res->granted, list) { - if (lock->ml.node == dead_node) { - mlog(0, "AHA! there was " - "a $RECOVERY lock for dead " - "node %u (%s)!\n", - dead_node, dlm->name); - list_del_init(&lock->list); - dlm_lock_put(lock); - break; - } - } - spin_unlock(&res->spinlock); - continue; - } - - if (res->owner == dead_node) { - mlog(0, "found lockres owned by dead node while " - "doing recovery for node %u. sending it.\n", - dead_node); - list_move_tail(&res->recovering, list); - } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { - mlog(0, "found UNKNOWN owner while doing recovery " - "for node %u. sending it.\n", dead_node); - list_move_tail(&res->recovering, list); - } - } - spin_unlock(&dlm->spinlock); -} - -static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res) -{ - int total_locks = 0; - struct list_head *iter, *queue = &res->granted; - int i; - - for (i=0; i<3; i++) { - list_for_each(iter, queue) - total_locks++; - queue++; - } - return total_locks; -} - - -static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm, - struct dlm_migratable_lockres *mres, - u8 send_to, - struct dlm_lock_resource *res, - int total_locks) -{ - u64 mig_cookie = be64_to_cpu(mres->mig_cookie); - int mres_total_locks = be32_to_cpu(mres->total_locks); - int sz, ret = 0, status = 0; - u8 orig_flags = mres->flags, - orig_master = mres->master; - - BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS); - if (!mres->num_locks) - return 0; - - sz = sizeof(struct dlm_migratable_lockres) + - (mres->num_locks * sizeof(struct dlm_migratable_lock)); - - /* add an all-done flag if we reached the last lock */ - orig_flags = mres->flags; - BUG_ON(total_locks > mres_total_locks); - if (total_locks == mres_total_locks) - mres->flags |= DLM_MRES_ALL_DONE; - - mlog(0, "%s:%.*s: sending mig lockres (%s) to %u\n", - dlm->name, res->lockname.len, res->lockname.name, - orig_flags & DLM_MRES_MIGRATION ? "migration" : "recovery", - send_to); - - /* send it */ - ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres, - sz, send_to, &status); - if (ret < 0) { - /* XXX: negative status is not handled. - * this will end up killing this node. */ - mlog(ML_ERROR, "%s: res %.*s, Error %d send MIG_LOCKRES to " - "node %u (%s)\n", dlm->name, mres->lockname_len, - mres->lockname, ret, send_to, - (orig_flags & DLM_MRES_MIGRATION ? - "migration" : "recovery")); - } else { - /* might get an -ENOMEM back here */ - ret = status; - if (ret < 0) { - mlog_errno(ret); - - if (ret == -EFAULT) { - mlog(ML_ERROR, "node %u told me to kill " - "myself!\n", send_to); - BUG(); - } - } - } - - /* zero and reinit the message buffer */ - dlm_init_migratable_lockres(mres, res->lockname.name, - res->lockname.len, mres_total_locks, - mig_cookie, orig_flags, orig_master); - return ret; -} - -static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres, - const char *lockname, int namelen, - int total_locks, u64 cookie, - u8 flags, u8 master) -{ - /* mres here is one full page */ - clear_page(mres); - mres->lockname_len = namelen; - memcpy(mres->lockname, lockname, namelen); - mres->num_locks = 0; - mres->total_locks = cpu_to_be32(total_locks); - mres->mig_cookie = cpu_to_be64(cookie); - mres->flags = flags; - mres->master = master; -} - -static void dlm_prepare_lvb_for_migration(struct dlm_lock *lock, - struct dlm_migratable_lockres *mres, - int queue) -{ - if (!lock->lksb) - return; - - /* Ignore lvb in all locks in the blocked list */ - if (queue == DLM_BLOCKED_LIST) - return; - - /* Only consider lvbs in locks with granted EX or PR lock levels */ - if (lock->ml.type != LKM_EXMODE && lock->ml.type != LKM_PRMODE) - return; - - if (dlm_lvb_is_empty(mres->lvb)) { - memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN); - return; - } - - /* Ensure the lvb copied for migration matches in other valid locks */ - if (!memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN)) - return; - - mlog(ML_ERROR, "Mismatched lvb in lock cookie=%u:%llu, name=%.*s, " - "node=%u\n", - dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), - dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), - lock->lockres->lockname.len, lock->lockres->lockname.name, - lock->ml.node); - dlm_print_one_lock_resource(lock->lockres); - BUG(); -} - -/* returns 1 if this lock fills the network structure, - * 0 otherwise */ -static int dlm_add_lock_to_array(struct dlm_lock *lock, - struct dlm_migratable_lockres *mres, int queue) -{ - struct dlm_migratable_lock *ml; - int lock_num = mres->num_locks; - - ml = &(mres->ml[lock_num]); - ml->cookie = lock->ml.cookie; - ml->type = lock->ml.type; - ml->convert_type = lock->ml.convert_type; - ml->highest_blocked = lock->ml.highest_blocked; - ml->list = queue; - if (lock->lksb) { - ml->flags = lock->lksb->flags; - dlm_prepare_lvb_for_migration(lock, mres, queue); - } - ml->node = lock->ml.node; - mres->num_locks++; - /* we reached the max, send this network message */ - if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS) - return 1; - return 0; -} - -static void dlm_add_dummy_lock(struct dlm_ctxt *dlm, - struct dlm_migratable_lockres *mres) -{ - struct dlm_lock dummy; - memset(&dummy, 0, sizeof(dummy)); - dummy.ml.cookie = 0; - dummy.ml.type = LKM_IVMODE; - dummy.ml.convert_type = LKM_IVMODE; - dummy.ml.highest_blocked = LKM_IVMODE; - dummy.lksb = NULL; - dummy.ml.node = dlm->node_num; - dlm_add_lock_to_array(&dummy, mres, DLM_BLOCKED_LIST); -} - -static inline int dlm_is_dummy_lock(struct dlm_ctxt *dlm, - struct dlm_migratable_lock *ml, - u8 *nodenum) -{ - if (unlikely(ml->cookie == 0 && - ml->type == LKM_IVMODE && - ml->convert_type == LKM_IVMODE && - ml->highest_blocked == LKM_IVMODE && - ml->list == DLM_BLOCKED_LIST)) { - *nodenum = ml->node; - return 1; - } - return 0; -} - -int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, - struct dlm_migratable_lockres *mres, - u8 send_to, u8 flags) -{ - struct list_head *queue; - int total_locks, i; - u64 mig_cookie = 0; - struct dlm_lock *lock; - int ret = 0; - - BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION))); - - mlog(0, "sending to %u\n", send_to); - - total_locks = dlm_num_locks_in_lockres(res); - if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) { - /* rare, but possible */ - mlog(0, "argh. lockres has %d locks. this will " - "require more than one network packet to " - "migrate\n", total_locks); - mig_cookie = dlm_get_next_mig_cookie(); - } - - dlm_init_migratable_lockres(mres, res->lockname.name, - res->lockname.len, total_locks, - mig_cookie, flags, res->owner); - - total_locks = 0; - for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) { - queue = dlm_list_idx_to_ptr(res, i); - list_for_each_entry(lock, queue, list) { - /* add another lock. */ - total_locks++; - if (!dlm_add_lock_to_array(lock, mres, i)) - continue; - - /* this filled the lock message, - * we must send it immediately. */ - ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, - res, total_locks); - if (ret < 0) - goto error; - } - } - if (total_locks == 0) { - /* send a dummy lock to indicate a mastery reference only */ - mlog(0, "%s:%.*s: sending dummy lock to %u, %s\n", - dlm->name, res->lockname.len, res->lockname.name, - send_to, flags & DLM_MRES_RECOVERY ? "recovery" : - "migration"); - dlm_add_dummy_lock(dlm, mres); - } - /* flush any remaining locks */ - ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks); - if (ret < 0) - goto error; - return ret; - -error: - mlog(ML_ERROR, "%s: dlm_send_mig_lockres_msg returned %d\n", - dlm->name, ret); - if (!dlm_is_host_down(ret)) - BUG(); - mlog(0, "%s: node %u went down while sending %s " - "lockres %.*s\n", dlm->name, send_to, - flags & DLM_MRES_RECOVERY ? "recovery" : "migration", - res->lockname.len, res->lockname.name); - return ret; -} - - - -/* - * this message will contain no more than one page worth of - * recovery data, and it will work on only one lockres. - * there may be many locks in this page, and we may need to wait - * for additional packets to complete all the locks (rare, but - * possible). - */ -/* - * NOTE: the allocation error cases here are scary - * we really cannot afford to fail an alloc in recovery - * do we spin? returning an error only delays the problem really - */ - -int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data, - void **ret_data) -{ - struct dlm_ctxt *dlm = data; - struct dlm_migratable_lockres *mres = - (struct dlm_migratable_lockres *)msg->buf; - int ret = 0; - u8 real_master; - u8 extra_refs = 0; - char *buf = NULL; - struct dlm_work_item *item = NULL; - struct dlm_lock_resource *res = NULL; - - if (!dlm_grab(dlm)) - return -EINVAL; - - BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION))); - - real_master = mres->master; - if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { - /* cannot migrate a lockres with no master */ - BUG_ON(!(mres->flags & DLM_MRES_RECOVERY)); - } - - mlog(0, "%s message received from node %u\n", - (mres->flags & DLM_MRES_RECOVERY) ? - "recovery" : "migration", mres->master); - if (mres->flags & DLM_MRES_ALL_DONE) - mlog(0, "all done flag. all lockres data received!\n"); - - ret = -ENOMEM; - buf = kmalloc(be16_to_cpu(msg->data_len), GFP_NOFS); - item = kzalloc(sizeof(*item), GFP_NOFS); - if (!buf || !item) - goto leave; - - /* lookup the lock to see if we have a secondary queue for this - * already... just add the locks in and this will have its owner - * and RECOVERY flag changed when it completes. */ - res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len); - if (res) { - /* this will get a ref on res */ - /* mark it as recovering/migrating and hash it */ - spin_lock(&res->spinlock); - if (mres->flags & DLM_MRES_RECOVERY) { - res->state |= DLM_LOCK_RES_RECOVERING; - } else { - if (res->state & DLM_LOCK_RES_MIGRATING) { - /* this is at least the second - * lockres message */ - mlog(0, "lock %.*s is already migrating\n", - mres->lockname_len, - mres->lockname); - } else if (res->state & DLM_LOCK_RES_RECOVERING) { - /* caller should BUG */ - mlog(ML_ERROR, "node is attempting to migrate " - "lock %.*s, but marked as recovering!\n", - mres->lockname_len, mres->lockname); - ret = -EFAULT; - spin_unlock(&res->spinlock); - goto leave; - } - res->state |= DLM_LOCK_RES_MIGRATING; - } - spin_unlock(&res->spinlock); - } else { - /* need to allocate, just like if it was - * mastered here normally */ - res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len); - if (!res) - goto leave; - - /* to match the ref that we would have gotten if - * dlm_lookup_lockres had succeeded */ - dlm_lockres_get(res); - - /* mark it as recovering/migrating and hash it */ - if (mres->flags & DLM_MRES_RECOVERY) - res->state |= DLM_LOCK_RES_RECOVERING; - else - res->state |= DLM_LOCK_RES_MIGRATING; - - spin_lock(&dlm->spinlock); - __dlm_insert_lockres(dlm, res); - spin_unlock(&dlm->spinlock); - - /* Add an extra ref for this lock-less lockres lest the - * dlm_thread purges it before we get the chance to add - * locks to it */ - dlm_lockres_get(res); - - /* There are three refs that need to be put. - * 1. Taken above. - * 2. kref_init in dlm_new_lockres()->dlm_init_lockres(). - * 3. dlm_lookup_lockres() - * The first one is handled at the end of this function. The - * other two are handled in the worker thread after locks have - * been attached. Yes, we don't wait for purge time to match - * kref_init. The lockres will still have atleast one ref - * added because it is in the hash __dlm_insert_lockres() */ - extra_refs++; - - /* now that the new lockres is inserted, - * make it usable by other processes */ - spin_lock(&res->spinlock); - res->state &= ~DLM_LOCK_RES_IN_PROGRESS; - spin_unlock(&res->spinlock); - wake_up(&res->wq); - } - - /* at this point we have allocated everything we need, - * and we have a hashed lockres with an extra ref and - * the proper res->state flags. */ - ret = 0; - spin_lock(&res->spinlock); - /* drop this either when master requery finds a different master - * or when a lock is added by the recovery worker */ - dlm_lockres_grab_inflight_ref(dlm, res); - if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) { - /* migration cannot have an unknown master */ - BUG_ON(!(mres->flags & DLM_MRES_RECOVERY)); - mlog(0, "recovery has passed me a lockres with an " - "unknown owner.. will need to requery: " - "%.*s\n", mres->lockname_len, mres->lockname); - } else { - /* take a reference now to pin the lockres, drop it - * when locks are added in the worker */ - dlm_change_lockres_owner(dlm, res, dlm->node_num); - } - spin_unlock(&res->spinlock); - - /* queue up work for dlm_mig_lockres_worker */ - dlm_grab(dlm); /* get an extra ref for the work item */ - memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */ - dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf); - item->u.ml.lockres = res; /* already have a ref */ - item->u.ml.real_master = real_master; - item->u.ml.extra_ref = extra_refs; - spin_lock(&dlm->work_lock); - list_add_tail(&item->list, &dlm->work_list); - spin_unlock(&dlm->work_lock); - queue_work(dlm->dlm_worker, &dlm->dispatched_work); - -leave: - /* One extra ref taken needs to be put here */ - if (extra_refs) - dlm_lockres_put(res); - - dlm_put(dlm); - if (ret < 0) { - if (buf) - kfree(buf); - if (item) - kfree(item); - mlog_errno(ret); - } - - return ret; -} - - -static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data) -{ - struct dlm_ctxt *dlm; - struct dlm_migratable_lockres *mres; - int ret = 0; - struct dlm_lock_resource *res; - u8 real_master; - u8 extra_ref; - - dlm = item->dlm; - mres = (struct dlm_migratable_lockres *)data; - - res = item->u.ml.lockres; - real_master = item->u.ml.real_master; - extra_ref = item->u.ml.extra_ref; - - if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { - /* this case is super-rare. only occurs if - * node death happens during migration. */ -again: - ret = dlm_lockres_master_requery(dlm, res, &real_master); - if (ret < 0) { - mlog(0, "dlm_lockres_master_requery ret=%d\n", - ret); - goto again; - } - if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) { - mlog(0, "lockres %.*s not claimed. " - "this node will take it.\n", - res->lockname.len, res->lockname.name); - } else { - spin_lock(&res->spinlock); - dlm_lockres_drop_inflight_ref(dlm, res); - spin_unlock(&res->spinlock); - mlog(0, "master needs to respond to sender " - "that node %u still owns %.*s\n", - real_master, res->lockname.len, - res->lockname.name); - /* cannot touch this lockres */ - goto leave; - } - } - - ret = dlm_process_recovery_data(dlm, res, mres); - if (ret < 0) - mlog(0, "dlm_process_recovery_data returned %d\n", ret); - else - mlog(0, "dlm_process_recovery_data succeeded\n"); - - if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) == - (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) { - ret = dlm_finish_migration(dlm, res, mres->master); - if (ret < 0) - mlog_errno(ret); - } - -leave: - /* See comment in dlm_mig_lockres_handler() */ - if (res) { - if (extra_ref) - dlm_lockres_put(res); - dlm_lockres_put(res); - } - kfree(data); -} - - - -static int dlm_lockres_master_requery(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res, - u8 *real_master) -{ - struct dlm_node_iter iter; - int nodenum; - int ret = 0; - - *real_master = DLM_LOCK_RES_OWNER_UNKNOWN; - - /* we only reach here if one of the two nodes in a - * migration died while the migration was in progress. - * at this point we need to requery the master. we - * know that the new_master got as far as creating - * an mle on at least one node, but we do not know - * if any nodes had actually cleared the mle and set - * the master to the new_master. the old master - * is supposed to set the owner to UNKNOWN in the - * event of a new_master death, so the only possible - * responses that we can get from nodes here are - * that the master is new_master, or that the master - * is UNKNOWN. - * if all nodes come back with UNKNOWN then we know - * the lock needs remastering here. - * if any node comes back with a valid master, check - * to see if that master is the one that we are - * recovering. if so, then the new_master died and - * we need to remaster this lock. if not, then the - * new_master survived and that node will respond to - * other nodes about the owner. - * if there is an owner, this node needs to dump this - * lockres and alert the sender that this lockres - * was rejected. */ - spin_lock(&dlm->spinlock); - dlm_node_iter_init(dlm->domain_map, &iter); - spin_unlock(&dlm->spinlock); - - while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { - /* do not send to self */ - if (nodenum == dlm->node_num) - continue; - ret = dlm_do_master_requery(dlm, res, nodenum, real_master); - if (ret < 0) { - mlog_errno(ret); - if (!dlm_is_host_down(ret)) - BUG(); - /* host is down, so answer for that node would be - * DLM_LOCK_RES_OWNER_UNKNOWN. continue. */ - } - if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) { - mlog(0, "lock master is %u\n", *real_master); - break; - } - } - return ret; -} - - -int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, - u8 nodenum, u8 *real_master) -{ - int ret = -EINVAL; - struct dlm_master_requery req; - int status = DLM_LOCK_RES_OWNER_UNKNOWN; - - memset(&req, 0, sizeof(req)); - req.node_idx = dlm->node_num; - req.namelen = res->lockname.len; - memcpy(req.name, res->lockname.name, res->lockname.len); - - ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key, - &req, sizeof(req), nodenum, &status); - /* XXX: negative status not handled properly here. */ - if (ret < 0) - mlog(ML_ERROR, "Error %d when sending message %u (key " - "0x%x) to node %u\n", ret, DLM_MASTER_REQUERY_MSG, - dlm->key, nodenum); - else { - BUG_ON(status < 0); - BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN); - *real_master = (u8) (status & 0xff); - mlog(0, "node %u responded to master requery with %u\n", - nodenum, *real_master); - ret = 0; - } - return ret; -} - - -/* this function cannot error, so unless the sending - * or receiving of the message failed, the owner can - * be trusted */ -int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data, - void **ret_data) -{ - struct dlm_ctxt *dlm = data; - struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf; - struct dlm_lock_resource *res = NULL; - unsigned int hash; - int master = DLM_LOCK_RES_OWNER_UNKNOWN; - u32 flags = DLM_ASSERT_MASTER_REQUERY; - - if (!dlm_grab(dlm)) { - /* since the domain has gone away on this - * node, the proper response is UNKNOWN */ - return master; - } - - hash = dlm_lockid_hash(req->name, req->namelen); - - spin_lock(&dlm->spinlock); - res = __dlm_lookup_lockres(dlm, req->name, req->namelen, hash); - if (res) { - spin_lock(&res->spinlock); - master = res->owner; - if (master == dlm->node_num) { - int ret = dlm_dispatch_assert_master(dlm, res, - 0, 0, flags); - if (ret < 0) { - mlog_errno(-ENOMEM); - /* retry!? */ - BUG(); - } - } else /* put.. incase we are not the master */ - dlm_lockres_put(res); - spin_unlock(&res->spinlock); - } - spin_unlock(&dlm->spinlock); - - dlm_put(dlm); - return master; -} - -static inline struct list_head * -dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num) -{ - struct list_head *ret; - BUG_ON(list_num < 0); - BUG_ON(list_num > 2); - ret = &(res->granted); - ret += list_num; - return ret; -} -/* TODO: do ast flush business - * TODO: do MIGRATING and RECOVERING spinning - */ - -/* -* NOTE about in-flight requests during migration: -* -* Before attempting the migrate, the master has marked the lockres as -* MIGRATING and then flushed all of its pending ASTS. So any in-flight -* requests either got queued before the MIGRATING flag got set, in which -* case the lock data will reflect the change and a return message is on -* the way, or the request failed to get in before MIGRATING got set. In -* this case, the caller will be told to spin and wait for the MIGRATING -* flag to be dropped, then recheck the master. -* This holds true for the convert, cancel and unlock cases, and since lvb -* updates are tied to these same messages, it applies to lvb updates as -* well. For the lock case, there is no way a lock can be on the master -* queue and not be on the secondary queue since the lock is always added -* locally first. This means that the new target node will never be sent -* a lock that he doesn't already have on the list. -* In total, this means that the local lock is correct and should not be -* updated to match the one sent by the master. Any messages sent back -* from the master before the MIGRATING flag will bring the lock properly -* up-to-date, and the change will be ordered properly for the waiter. -* We will *not* attempt to modify the lock underneath the waiter. -*/ - -static int dlm_process_recovery_data(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res, - struct dlm_migratable_lockres *mres) -{ - struct dlm_migratable_lock *ml; - struct list_head *queue; - struct list_head *tmpq = NULL; - struct dlm_lock *newlock = NULL; - struct dlm_lockstatus *lksb = NULL; - int ret = 0; - int i, j, bad; - struct dlm_lock *lock = NULL; - u8 from = O2NM_MAX_NODES; - unsigned int added = 0; - __be64 c; - - mlog(0, "running %d locks for this lockres\n", mres->num_locks); - for (i=0; i<mres->num_locks; i++) { - ml = &(mres->ml[i]); - - if (dlm_is_dummy_lock(dlm, ml, &from)) { - /* placeholder, just need to set the refmap bit */ - BUG_ON(mres->num_locks != 1); - mlog(0, "%s:%.*s: dummy lock for %u\n", - dlm->name, mres->lockname_len, mres->lockname, - from); - spin_lock(&res->spinlock); - dlm_lockres_set_refmap_bit(dlm, res, from); - spin_unlock(&res->spinlock); - added++; - break; - } - BUG_ON(ml->highest_blocked != LKM_IVMODE); - newlock = NULL; - lksb = NULL; - - queue = dlm_list_num_to_pointer(res, ml->list); - tmpq = NULL; - - /* if the lock is for the local node it needs to - * be moved to the proper location within the queue. - * do not allocate a new lock structure. */ - if (ml->node == dlm->node_num) { - /* MIGRATION ONLY! */ - BUG_ON(!(mres->flags & DLM_MRES_MIGRATION)); - - spin_lock(&res->spinlock); - for (j = DLM_GRANTED_LIST; j <= DLM_BLOCKED_LIST; j++) { - tmpq = dlm_list_idx_to_ptr(res, j); - list_for_each_entry(lock, tmpq, list) { - if (lock->ml.cookie != ml->cookie) - lock = NULL; - else - break; - } - if (lock) - break; - } - - /* lock is always created locally first, and - * destroyed locally last. it must be on the list */ - if (!lock) { - c = ml->cookie; - mlog(ML_ERROR, "Could not find local lock " - "with cookie %u:%llu, node %u, " - "list %u, flags 0x%x, type %d, " - "conv %d, highest blocked %d\n", - dlm_get_lock_cookie_node(be64_to_cpu(c)), - dlm_get_lock_cookie_seq(be64_to_cpu(c)), - ml->node, ml->list, ml->flags, ml->type, - ml->convert_type, ml->highest_blocked); - __dlm_print_one_lock_resource(res); - BUG(); - } - - if (lock->ml.node != ml->node) { - c = lock->ml.cookie; - mlog(ML_ERROR, "Mismatched node# in lock " - "cookie %u:%llu, name %.*s, node %u\n", - dlm_get_lock_cookie_node(be64_to_cpu(c)), - dlm_get_lock_cookie_seq(be64_to_cpu(c)), - res->lockname.len, res->lockname.name, - lock->ml.node); - c = ml->cookie; - mlog(ML_ERROR, "Migrate lock cookie %u:%llu, " - "node %u, list %u, flags 0x%x, type %d, " - "conv %d, highest blocked %d\n", - dlm_get_lock_cookie_node(be64_to_cpu(c)), - dlm_get_lock_cookie_seq(be64_to_cpu(c)), - ml->node, ml->list, ml->flags, ml->type, - ml->convert_type, ml->highest_blocked); - __dlm_print_one_lock_resource(res); - BUG(); - } - - if (tmpq != queue) { - c = ml->cookie; - mlog(0, "Lock cookie %u:%llu was on list %u " - "instead of list %u for %.*s\n", - dlm_get_lock_cookie_node(be64_to_cpu(c)), - dlm_get_lock_cookie_seq(be64_to_cpu(c)), - j, ml->list, res->lockname.len, - res->lockname.name); - __dlm_print_one_lock_resource(res); - spin_unlock(&res->spinlock); - continue; - } - - /* see NOTE above about why we do not update - * to match the master here */ - - /* move the lock to its proper place */ - /* do not alter lock refcount. switching lists. */ - list_move_tail(&lock->list, queue); - spin_unlock(&res->spinlock); - added++; - - mlog(0, "just reordered a local lock!\n"); - continue; - } - - /* lock is for another node. */ - newlock = dlm_new_lock(ml->type, ml->node, - be64_to_cpu(ml->cookie), NULL); - if (!newlock) { - ret = -ENOMEM; - goto leave; - } - lksb = newlock->lksb; - dlm_lock_attach_lockres(newlock, res); - - if (ml->convert_type != LKM_IVMODE) { - BUG_ON(queue != &res->converting); - newlock->ml.convert_type = ml->convert_type; - } - lksb->flags |= (ml->flags & - (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); - - if (ml->type == LKM_NLMODE) - goto skip_lvb; - - if (!dlm_lvb_is_empty(mres->lvb)) { - if (lksb->flags & DLM_LKSB_PUT_LVB) { - /* other node was trying to update - * lvb when node died. recreate the - * lksb with the updated lvb. */ - memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN); - /* the lock resource lvb update must happen - * NOW, before the spinlock is dropped. - * we no longer wait for the AST to update - * the lvb. */ - memcpy(res->lvb, mres->lvb, DLM_LVB_LEN); - } else { - /* otherwise, the node is sending its - * most recent valid lvb info */ - BUG_ON(ml->type != LKM_EXMODE && - ml->type != LKM_PRMODE); - if (!dlm_lvb_is_empty(res->lvb) && - (ml->type == LKM_EXMODE || - memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) { - int i; - mlog(ML_ERROR, "%s:%.*s: received bad " - "lvb! type=%d\n", dlm->name, - res->lockname.len, - res->lockname.name, ml->type); - printk("lockres lvb=["); - for (i=0; i<DLM_LVB_LEN; i++) - printk("%02x", res->lvb[i]); - printk("]\nmigrated lvb=["); - for (i=0; i<DLM_LVB_LEN; i++) - printk("%02x", mres->lvb[i]); - printk("]\n"); - dlm_print_one_lock_resource(res); - BUG(); - } - memcpy(res->lvb, mres->lvb, DLM_LVB_LEN); - } - } -skip_lvb: - - /* NOTE: - * wrt lock queue ordering and recovery: - * 1. order of locks on granted queue is - * meaningless. - * 2. order of locks on converting queue is - * LOST with the node death. sorry charlie. - * 3. order of locks on the blocked queue is - * also LOST. - * order of locks does not affect integrity, it - * just means that a lock request may get pushed - * back in line as a result of the node death. - * also note that for a given node the lock order - * for its secondary queue locks is preserved - * relative to each other, but clearly *not* - * preserved relative to locks from other nodes. - */ - bad = 0; - spin_lock(&res->spinlock); - list_for_each_entry(lock, queue, list) { - if (lock->ml.cookie == ml->cookie) { - c = lock->ml.cookie; - mlog(ML_ERROR, "%s:%.*s: %u:%llu: lock already " - "exists on this lockres!\n", dlm->name, - res->lockname.len, res->lockname.name, - dlm_get_lock_cookie_node(be64_to_cpu(c)), - dlm_get_lock_cookie_seq(be64_to_cpu(c))); - - mlog(ML_NOTICE, "sent lock: type=%d, conv=%d, " - "node=%u, cookie=%u:%llu, queue=%d\n", - ml->type, ml->convert_type, ml->node, - dlm_get_lock_cookie_node(be64_to_cpu(ml->cookie)), - dlm_get_lock_cookie_seq(be64_to_cpu(ml->cookie)), - ml->list); - - __dlm_print_one_lock_resource(res); - bad = 1; - break; - } - } - if (!bad) { - dlm_lock_get(newlock); - list_add_tail(&newlock->list, queue); - mlog(0, "%s:%.*s: added lock for node %u, " - "setting refmap bit\n", dlm->name, - res->lockname.len, res->lockname.name, ml->node); - dlm_lockres_set_refmap_bit(dlm, res, ml->node); - added++; - } - spin_unlock(&res->spinlock); - } - mlog(0, "done running all the locks\n"); - -leave: - /* balance the ref taken when the work was queued */ - spin_lock(&res->spinlock); - dlm_lockres_drop_inflight_ref(dlm, res); - spin_unlock(&res->spinlock); - - if (ret < 0) { - mlog_errno(ret); - if (newlock) - dlm_lock_put(newlock); - } - - return ret; -} - -void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res) -{ - int i; - struct list_head *queue; - struct dlm_lock *lock, *next; - - assert_spin_locked(&dlm->spinlock); - assert_spin_locked(&res->spinlock); - res->state |= DLM_LOCK_RES_RECOVERING; - if (!list_empty(&res->recovering)) { - mlog(0, - "Recovering res %s:%.*s, is already on recovery list!\n", - dlm->name, res->lockname.len, res->lockname.name); - list_del_init(&res->recovering); - dlm_lockres_put(res); - } - /* We need to hold a reference while on the recovery list */ - dlm_lockres_get(res); - list_add_tail(&res->recovering, &dlm->reco.resources); - - /* find any pending locks and put them back on proper list */ - for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) { - queue = dlm_list_idx_to_ptr(res, i); - list_for_each_entry_safe(lock, next, queue, list) { - dlm_lock_get(lock); - if (lock->convert_pending) { - /* move converting lock back to granted */ - BUG_ON(i != DLM_CONVERTING_LIST); - mlog(0, "node died with convert pending " - "on %.*s. move back to granted list.\n", - res->lockname.len, res->lockname.name); - dlm_revert_pending_convert(res, lock); - lock->convert_pending = 0; - } else if (lock->lock_pending) { - /* remove pending lock requests completely */ - BUG_ON(i != DLM_BLOCKED_LIST); - mlog(0, "node died with lock pending " - "on %.*s. remove from blocked list and skip.\n", - res->lockname.len, res->lockname.name); - /* lock will be floating until ref in - * dlmlock_remote is freed after the network - * call returns. ok for it to not be on any - * list since no ast can be called - * (the master is dead). */ - dlm_revert_pending_lock(res, lock); - lock->lock_pending = 0; - } else if (lock->unlock_pending) { - /* if an unlock was in progress, treat as - * if this had completed successfully - * before sending this lock state to the - * new master. note that the dlm_unlock - * call is still responsible for calling - * the unlockast. that will happen after - * the network call times out. for now, - * just move lists to prepare the new - * recovery master. */ - BUG_ON(i != DLM_GRANTED_LIST); - mlog(0, "node died with unlock pending " - "on %.*s. remove from blocked list and skip.\n", - res->lockname.len, res->lockname.name); - dlm_commit_pending_unlock(res, lock); - lock->unlock_pending = 0; - } else if (lock->cancel_pending) { - /* if a cancel was in progress, treat as - * if this had completed successfully - * before sending this lock state to the - * new master */ - BUG_ON(i != DLM_CONVERTING_LIST); - mlog(0, "node died with cancel pending " - "on %.*s. move back to granted list.\n", - res->lockname.len, res->lockname.name); - dlm_commit_pending_cancel(res, lock); - lock->cancel_pending = 0; - } - dlm_lock_put(lock); - } - } -} - - - -/* removes all recovered locks from the recovery list. - * sets the res->owner to the new master. - * unsets the RECOVERY flag and wakes waiters. */ -static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm, - u8 dead_node, u8 new_master) -{ - int i; - struct hlist_node *hash_iter; - struct hlist_head *bucket; - struct dlm_lock_resource *res, *next; - - assert_spin_locked(&dlm->spinlock); - - list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) { - if (res->owner == dead_node) { - mlog(0, "%s: res %.*s, Changing owner from %u to %u\n", - dlm->name, res->lockname.len, res->lockname.name, - res->owner, new_master); - list_del_init(&res->recovering); - spin_lock(&res->spinlock); - /* new_master has our reference from - * the lock state sent during recovery */ - dlm_change_lockres_owner(dlm, res, new_master); - res->state &= ~DLM_LOCK_RES_RECOVERING; - if (__dlm_lockres_has_locks(res)) - __dlm_dirty_lockres(dlm, res); - spin_unlock(&res->spinlock); - wake_up(&res->wq); - dlm_lockres_put(res); - } - } - - /* this will become unnecessary eventually, but - * for now we need to run the whole hash, clear - * the RECOVERING state and set the owner - * if necessary */ - for (i = 0; i < DLM_HASH_BUCKETS; i++) { - bucket = dlm_lockres_hash(dlm, i); - hlist_for_each_entry(res, hash_iter, bucket, hash_node) { - if (!(res->state & DLM_LOCK_RES_RECOVERING)) - continue; - - if (res->owner != dead_node && - res->owner != dlm->node_num) - continue; - - if (!list_empty(&res->recovering)) { - list_del_init(&res->recovering); - dlm_lockres_put(res); - } - - /* new_master has our reference from - * the lock state sent during recovery */ - mlog(0, "%s: res %.*s, Changing owner from %u to %u\n", - dlm->name, res->lockname.len, res->lockname.name, - res->owner, new_master); - spin_lock(&res->spinlock); - dlm_change_lockres_owner(dlm, res, new_master); - res->state &= ~DLM_LOCK_RES_RECOVERING; - if (__dlm_lockres_has_locks(res)) - __dlm_dirty_lockres(dlm, res); - spin_unlock(&res->spinlock); - wake_up(&res->wq); - } - } -} - -static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local) -{ - if (local) { - if (lock->ml.type != LKM_EXMODE && - lock->ml.type != LKM_PRMODE) - return 1; - } else if (lock->ml.type == LKM_EXMODE) - return 1; - return 0; -} - -static void dlm_revalidate_lvb(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res, u8 dead_node) -{ - struct list_head *queue; - struct dlm_lock *lock; - int blank_lvb = 0, local = 0; - int i; - u8 search_node; - - assert_spin_locked(&dlm->spinlock); - assert_spin_locked(&res->spinlock); - - if (res->owner == dlm->node_num) - /* if this node owned the lockres, and if the dead node - * had an EX when he died, blank out the lvb */ - search_node = dead_node; - else { - /* if this is a secondary lockres, and we had no EX or PR - * locks granted, we can no longer trust the lvb */ - search_node = dlm->node_num; - local = 1; /* check local state for valid lvb */ - } - - for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) { - queue = dlm_list_idx_to_ptr(res, i); - list_for_each_entry(lock, queue, list) { - if (lock->ml.node == search_node) { - if (dlm_lvb_needs_invalidation(lock, local)) { - /* zero the lksb lvb and lockres lvb */ - blank_lvb = 1; - memset(lock->lksb->lvb, 0, DLM_LVB_LEN); - } - } - } - } - - if (blank_lvb) { - mlog(0, "clearing %.*s lvb, dead node %u had EX\n", - res->lockname.len, res->lockname.name, dead_node); - memset(res->lvb, 0, DLM_LVB_LEN); - } -} - -static void dlm_free_dead_locks(struct dlm_ctxt *dlm, - struct dlm_lock_resource *res, u8 dead_node) -{ - struct dlm_lock *lock, *next; - unsigned int freed = 0; - - /* this node is the lockres master: - * 1) remove any stale locks for the dead node - * 2) if the dead node had an EX when he died, blank out the lvb - */ - assert_spin_locked(&dlm->spinlock); - assert_spin_locked(&res->spinlock); - - /* We do two dlm_lock_put(). One for removing from list and the other is - * to force the DLM_UNLOCK_FREE_LOCK action so as to free the locks */ - - /* TODO: check pending_asts, pending_basts here */ - list_for_each_entry_safe(lock, next, &res->granted, list) { - if (lock->ml.node == dead_node) { - list_del_init(&lock->list); - dlm_lock_put(lock); - /* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */ - dlm_lock_put(lock); - freed++; - } - } - list_for_each_entry_safe(lock, next, &res->converting, list) { - if (lock->ml.node == dead_node) { - list_del_init(&lock->list); - dlm_lock_put(lock); - /* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */ - dlm_lock_put(lock); - freed++; - } - } - list_for_each_entry_safe(lock, next, &res->blocked, list) { - if (lock->ml.node == dead_node) { - list_del_init(&lock->list); - dlm_lock_put(lock); - /* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */ - dlm_lock_put(lock); - freed++; - } - } - - if (freed) { - mlog(0, "%s:%.*s: freed %u locks for dead node %u, " - "dropping ref from lockres\n", dlm->name, - res->lockname.len, res->lockname.name, freed, dead_node); - if(!test_bit(dead_node, res->refmap)) { - mlog(ML_ERROR, "%s:%.*s: freed %u locks for dead node %u, " - "but ref was not set\n", dlm->name, - res->lockname.len, res->lockname.name, freed, dead_node); - __dlm_print_one_lock_resource(res); - } - dlm_lockres_clear_refmap_bit(dlm, res, dead_node); - } else if (test_bit(dead_node, res->refmap)) { - mlog(0, "%s:%.*s: dead node %u had a ref, but had " - "no locks and had not purged before dying\n", dlm->name, - res->lockname.len, res->lockname.name, dead_node); - dlm_lockres_clear_refmap_bit(dlm, res, dead_node); - } - - /* do not kick thread yet */ - __dlm_dirty_lockres(dlm, res); -} - -/* if this node is the recovery master, and there are no - * locks for a given lockres owned by this node that are in - * either PR or EX mode, zero out the lvb before requesting. - * - */ - - -static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node) -{ - struct hlist_node *iter; - struct dlm_lock_resource *res; - int i; - struct hlist_head *bucket; - struct dlm_lock *lock; - - - /* purge any stale mles */ - dlm_clean_master_list(dlm, dead_node); - - /* - * now clean up all lock resources. there are two rules: - * - * 1) if the dead node was the master, move the lockres - * to the recovering list. set the RECOVERING flag. - * this lockres needs to be cleaned up before it can - * be used further. - * - * 2) if this node was the master, remove all locks from - * each of the lockres queues that were owned by the - * dead node. once recovery finishes, the dlm thread - * can be kicked again to see if any ASTs or BASTs - * need to be fired as a result. - */ - for (i = 0; i < DLM_HASH_BUCKETS; i++) { - bucket = dlm_lockres_hash(dlm, i); - hlist_for_each_entry(res, iter, bucket, hash_node) { - /* always prune any $RECOVERY entries for dead nodes, - * otherwise hangs can occur during later recovery */ - if (dlm_is_recovery_lock(res->lockname.name, - res->lockname.len)) { - spin_lock(&res->spinlock); - list_for_each_entry(lock, &res->granted, list) { - if (lock->ml.node == dead_node) { - mlog(0, "AHA! there was " - "a $RECOVERY lock for dead " - "node %u (%s)!\n", - dead_node, dlm->name); - list_del_init(&lock->list); - dlm_lock_put(lock); - break; - } - } - spin_unlock(&res->spinlock); - continue; - } - spin_lock(&res->spinlock); - /* zero the lvb if necessary */ - dlm_revalidate_lvb(dlm, res, dead_node); - if (res->owner == dead_node) { - if (res->state & DLM_LOCK_RES_DROPPING_REF) { - mlog(ML_NOTICE, "%s: res %.*s, Skip " - "recovery as it is being freed\n", - dlm->name, res->lockname.len, - res->lockname.name); - } else - dlm_move_lockres_to_recovery_list(dlm, - res); - - } else if (res->owner == dlm->node_num) { - dlm_free_dead_locks(dlm, res, dead_node); - __dlm_lockres_calc_usage(dlm, res); - } - spin_unlock(&res->spinlock); - } - } - -} - -static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx) -{ - assert_spin_locked(&dlm->spinlock); - - if (dlm->reco.new_master == idx) { - mlog(0, "%s: recovery master %d just died\n", - dlm->name, idx); - if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) { - /* finalize1 was reached, so it is safe to clear - * the new_master and dead_node. that recovery - * is complete. */ - mlog(0, "%s: dead master %d had reached " - "finalize1 state, clearing\n", dlm->name, idx); - dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE; - __dlm_reset_recovery(dlm); - } - } - - /* Clean up join state on node death. */ - if (dlm->joining_node == idx) { - mlog(0, "Clearing join state for node %u\n", idx); - __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); - } - - /* check to see if the node is already considered dead */ - if (!test_bit(idx, dlm->live_nodes_map)) { - mlog(0, "for domain %s, node %d is already dead. " - "another node likely did recovery already.\n", - dlm->name, idx); - return; - } - - /* check to see if we do not care about this node */ - if (!test_bit(idx, dlm->domain_map)) { - /* This also catches the case that we get a node down - * but haven't joined the domain yet. */ - mlog(0, "node %u already removed from domain!\n", idx); - return; - } - - clear_bit(idx, dlm->live_nodes_map); - - /* make sure local cleanup occurs before the heartbeat events */ - if (!test_bit(idx, dlm->recovery_map)) - dlm_do_local_recovery_cleanup(dlm, idx); - - /* notify anything attached to the heartbeat events */ - dlm_hb_event_notify_attached(dlm, idx, 0); - - mlog(0, "node %u being removed from domain map!\n", idx); - clear_bit(idx, dlm->domain_map); - clear_bit(idx, dlm->exit_domain_map); - /* wake up migration waiters if a node goes down. - * perhaps later we can genericize this for other waiters. */ - wake_up(&dlm->migration_wq); - - if (test_bit(idx, dlm->recovery_map)) - mlog(0, "domain %s, node %u already added " - "to recovery map!\n", dlm->name, idx); - else - set_bit(idx, dlm->recovery_map); -} - -void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data) -{ - struct dlm_ctxt *dlm = data; - - if (!dlm_grab(dlm)) - return; - - /* - * This will notify any dlm users that a node in our domain - * went away without notifying us first. - */ - if (test_bit(idx, dlm->domain_map)) - dlm_fire_domain_eviction_callbacks(dlm, idx); - - spin_lock(&dlm->spinlock); - __dlm_hb_node_down(dlm, idx); - spin_unlock(&dlm->spinlock); - - dlm_put(dlm); -} - -void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data) -{ - struct dlm_ctxt *dlm = data; - - if (!dlm_grab(dlm)) - return; - - spin_lock(&dlm->spinlock); - set_bit(idx, dlm->live_nodes_map); - /* do NOT notify mle attached to the heartbeat events. - * new nodes are not interesting in mastery until joined. */ - spin_unlock(&dlm->spinlock); - - dlm_put(dlm); -} - -static void dlm_reco_ast(void *astdata) -{ - struct dlm_ctxt *dlm = astdata; - mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n", - dlm->node_num, dlm->name); -} -static void dlm_reco_bast(void *astdata, int blocked_type) -{ - struct dlm_ctxt *dlm = astdata; - mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n", - dlm->node_num, dlm->name); -} -static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st) -{ - mlog(0, "unlockast for recovery lock fired!\n"); -} - -/* - * dlm_pick_recovery_master will continually attempt to use - * dlmlock() on the special "$RECOVERY" lockres with the - * LKM_NOQUEUE flag to get an EX. every thread that enters - * this function on each node racing to become the recovery - * master will not stop attempting this until either: - * a) this node gets the EX (and becomes the recovery master), - * or b) dlm->reco.new_master gets set to some nodenum - * != O2NM_INVALID_NODE_NUM (another node will do the reco). - * so each time a recovery master is needed, the entire cluster - * will sync at this point. if the new master dies, that will - * be detected in dlm_do_recovery */ -static int dlm_pick_recovery_master(struct dlm_ctxt *dlm) -{ - enum dlm_status ret; - struct dlm_lockstatus lksb; - int status = -EINVAL; - - mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n", - dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num); -again: - memset(&lksb, 0, sizeof(lksb)); - - ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY, - DLM_RECOVERY_LOCK_NAME, DLM_RECOVERY_LOCK_NAME_LEN, - dlm_reco_ast, dlm, dlm_reco_bast); - - mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n", - dlm->name, ret, lksb.status); - - if (ret == DLM_NORMAL) { - mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n", - dlm->name, dlm->node_num); - - /* got the EX lock. check to see if another node - * just became the reco master */ - if (dlm_reco_master_ready(dlm)) { - mlog(0, "%s: got reco EX lock, but %u will " - "do the recovery\n", dlm->name, - dlm->reco.new_master); - status = -EEXIST; - } else { - status = 0; - - /* see if recovery was already finished elsewhere */ - spin_lock(&dlm->spinlock); - if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) { - status = -EINVAL; - mlog(0, "%s: got reco EX lock, but " - "node got recovered already\n", dlm->name); - if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) { - mlog(ML_ERROR, "%s: new master is %u " - "but no dead node!\n", - dlm->name, dlm->reco.new_master); - BUG(); - } - } - spin_unlock(&dlm->spinlock); - } - - /* if this node has actually become the recovery master, - * set the master and send the messages to begin recovery */ - if (!status) { - mlog(0, "%s: dead=%u, this=%u, sending " - "begin_reco now\n", dlm->name, - dlm->reco.dead_node, dlm->node_num); - status = dlm_send_begin_reco_message(dlm, - dlm->reco.dead_node); - /* this always succeeds */ - BUG_ON(status); - - /* set the new_master to this node */ - spin_lock(&dlm->spinlock); - dlm_set_reco_master(dlm, dlm->node_num); - spin_unlock(&dlm->spinlock); - } - - /* recovery lock is a special case. ast will not get fired, - * so just go ahead and unlock it. */ - ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm); - if (ret == DLM_DENIED) { - mlog(0, "got DLM_DENIED, trying LKM_CANCEL\n"); - ret = dlmunlock(dlm, &lksb, LKM_CANCEL, dlm_reco_unlock_ast, dlm); - } - if (ret != DLM_NORMAL) { - /* this would really suck. this could only happen - * if there was a network error during the unlock - * because of node death. this means the unlock - * is actually "done" and the lock structure is - * even freed. we can continue, but only - * because this specific lock name is special. */ - mlog(ML_ERROR, "dlmunlock returned %d\n", ret); - } - } else if (ret == DLM_NOTQUEUED) { - mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n", - dlm->name, dlm->node_num); - /* another node is master. wait on - * reco.new_master != O2NM_INVALID_NODE_NUM - * for at most one second */ - wait_event_timeout(dlm->dlm_reco_thread_wq, - dlm_reco_master_ready(dlm), - msecs_to_jiffies(1000)); - if (!dlm_reco_master_ready(dlm)) { - mlog(0, "%s: reco master taking awhile\n", - dlm->name); - goto again; - } - /* another node has informed this one that it is reco master */ - mlog(0, "%s: reco master %u is ready to recover %u\n", - dlm->name, dlm->reco.new_master, dlm->reco.dead_node); - status = -EEXIST; - } else if (ret == DLM_RECOVERING) { - mlog(0, "dlm=%s dlmlock says master node died (this=%u)\n", - dlm->name, dlm->node_num); - goto again; - } else { - struct dlm_lock_resource *res; - - /* dlmlock returned something other than NOTQUEUED or NORMAL */ - mlog(ML_ERROR, "%s: got %s from dlmlock($RECOVERY), " - "lksb.status=%s\n", dlm->name, dlm_errname(ret), - dlm_errname(lksb.status)); - res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME, - DLM_RECOVERY_LOCK_NAME_LEN); - if (res) { - dlm_print_one_lock_resource(res); - dlm_lockres_put(res); - } else { - mlog(ML_ERROR, "recovery lock not found\n"); - } - BUG(); - } - - return status; -} - -static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node) -{ - struct dlm_begin_reco br; - int ret = 0; - struct dlm_node_iter iter; - int nodenum; - int status; - - mlog(0, "%s: dead node is %u\n", dlm->name, dead_node); - - spin_lock(&dlm->spinlock); - dlm_node_iter_init(dlm->domain_map, &iter); - spin_unlock(&dlm->spinlock); - - clear_bit(dead_node, iter.node_map); - - memset(&br, 0, sizeof(br)); - br.node_idx = dlm->node_num; - br.dead_node = dead_node; - - while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { - ret = 0; - if (nodenum == dead_node) { - mlog(0, "not sending begin reco to dead node " - "%u\n", dead_node); - continue; - } - if (nodenum == dlm->node_num) { - mlog(0, "not sending begin reco to self\n"); - continue; - } -retry: - ret = -EINVAL; - mlog(0, "attempting to send begin reco msg to %d\n", - nodenum); - ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key, - &br, sizeof(br), nodenum, &status); - /* negative status is handled ok by caller here */ - if (ret >= 0) - ret = status; - if (dlm_is_host_down(ret)) { - /* node is down. not involved in recovery - * so just keep going */ - mlog(ML_NOTICE, "%s: node %u was down when sending " - "begin reco msg (%d)\n", dlm->name, nodenum, ret); - ret = 0; - } - - /* - * Prior to commit aad1b15310b9bcd59fa81ab8f2b1513b59553ea8, - * dlm_begin_reco_handler() returned EAGAIN and not -EAGAIN. - * We are handling both for compatibility reasons. - */ - if (ret == -EAGAIN || ret == EAGAIN) { - mlog(0, "%s: trying to start recovery of node " - "%u, but node %u is waiting for last recovery " - "to complete, backoff for a bit\n", dlm->name, - dead_node, nodenum); - msleep(100); - goto retry; - } - if (ret < 0) { - struct dlm_lock_resource *res; - - /* this is now a serious problem, possibly ENOMEM - * in the network stack. must retry */ - mlog_errno(ret); - mlog(ML_ERROR, "begin reco of dlm %s to node %u " - "returned %d\n", dlm->name, nodenum, ret); - res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME, - DLM_RECOVERY_LOCK_NAME_LEN); - if (res) { - dlm_print_one_lock_resource(res); - dlm_lockres_put(res); - } else { - mlog(ML_ERROR, "recovery lock not found\n"); - } - /* sleep for a bit in hopes that we can avoid - * another ENOMEM */ - msleep(100); - goto retry; - } - } - - return ret; -} - -int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data, - void **ret_data) -{ - struct dlm_ctxt *dlm = data; - struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf; - - /* ok to return 0, domain has gone away */ - if (!dlm_grab(dlm)) - return 0; - - spin_lock(&dlm->spinlock); - if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) { - mlog(0, "%s: node %u wants to recover node %u (%u:%u) " - "but this node is in finalize state, waiting on finalize2\n", - dlm->name, br->node_idx, br->dead_node, - dlm->reco.dead_node, dlm->reco.new_master); - spin_unlock(&dlm->spinlock); - return -EAGAIN; - } - spin_unlock(&dlm->spinlock); - - mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n", - dlm->name, br->node_idx, br->dead_node, - dlm->reco.dead_node, dlm->reco.new_master); - - dlm_fire_domain_eviction_callbacks(dlm, br->dead_node); - - spin_lock(&dlm->spinlock); - if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) { - if (test_bit(dlm->reco.new_master, dlm->recovery_map)) { - mlog(0, "%s: new_master %u died, changing " - "to %u\n", dlm->name, dlm->reco.new_master, - br->node_idx); - } else { - mlog(0, "%s: new_master %u NOT DEAD, changing " - "to %u\n", dlm->name, dlm->reco.new_master, - br->node_idx); - /* may not have seen the new master as dead yet */ - } - } - if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) { - mlog(ML_NOTICE, "%s: dead_node previously set to %u, " - "node %u changing it to %u\n", dlm->name, - dlm->reco.dead_node, br->node_idx, br->dead_node); - } - dlm_set_reco_master(dlm, br->node_idx); - dlm_set_reco_dead_node(dlm, br->dead_node); - if (!test_bit(br->dead_node, dlm->recovery_map)) { - mlog(0, "recovery master %u sees %u as dead, but this " - "node has not yet. marking %u as dead\n", - br->node_idx, br->dead_node, br->dead_node); - if (!test_bit(br->dead_node, dlm->domain_map) || - !test_bit(br->dead_node, dlm->live_nodes_map)) - mlog(0, "%u not in domain/live_nodes map " - "so setting it in reco map manually\n", - br->dead_node); - /* force the recovery cleanup in __dlm_hb_node_down - * both of these will be cleared in a moment */ - set_bit(br->dead_node, dlm->domain_map); - set_bit(br->dead_node, dlm->live_nodes_map); - __dlm_hb_node_down(dlm, br->dead_node); - } - spin_unlock(&dlm->spinlock); - - dlm_kick_recovery_thread(dlm); - - mlog(0, "%s: recovery started by node %u, for %u (%u:%u)\n", - dlm->name, br->node_idx, br->dead_node, - dlm->reco.dead_node, dlm->reco.new_master); - - dlm_put(dlm); - return 0; -} - -#define DLM_FINALIZE_STAGE2 0x01 -static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm) -{ - int ret = 0; - struct dlm_finalize_reco fr; - struct dlm_node_iter iter; - int nodenum; - int status; - int stage = 1; - - mlog(0, "finishing recovery for node %s:%u, " - "stage %d\n", dlm->name, dlm->reco.dead_node, stage); - - spin_lock(&dlm->spinlock); - dlm_node_iter_init(dlm->domain_map, &iter); - spin_unlock(&dlm->spinlock); - -stage2: - memset(&fr, 0, sizeof(fr)); - fr.node_idx = dlm->node_num; - fr.dead_node = dlm->reco.dead_node; - if (stage == 2) - fr.flags |= DLM_FINALIZE_STAGE2; - - while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { - if (nodenum == dlm->node_num) - continue; - ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key, - &fr, sizeof(fr), nodenum, &status); - if (ret >= 0) - ret = status; - if (ret < 0) { - mlog(ML_ERROR, "Error %d when sending message %u (key " - "0x%x) to node %u\n", ret, DLM_FINALIZE_RECO_MSG, - dlm->key, nodenum); - if (dlm_is_host_down(ret)) { - /* this has no effect on this recovery - * session, so set the status to zero to - * finish out the last recovery */ - mlog(ML_ERROR, "node %u went down after this " - "node finished recovery.\n", nodenum); - ret = 0; - continue; - } - break; - } - } - if (stage == 1) { - /* reset the node_iter back to the top and send finalize2 */ - iter.curnode = -1; - stage = 2; - goto stage2; - } - - return ret; -} - -int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data, - void **ret_data) -{ - struct dlm_ctxt *dlm = data; - struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf; - int stage = 1; - - /* ok to return 0, domain has gone away */ - if (!dlm_grab(dlm)) - return 0; - - if (fr->flags & DLM_FINALIZE_STAGE2) - stage = 2; - - mlog(0, "%s: node %u finalizing recovery stage%d of " - "node %u (%u:%u)\n", dlm->name, fr->node_idx, stage, - fr->dead_node, dlm->reco.dead_node, dlm->reco.new_master); - - spin_lock(&dlm->spinlock); - - if (dlm->reco.new_master != fr->node_idx) { - mlog(ML_ERROR, "node %u sent recovery finalize msg, but node " - "%u is supposed to be the new master, dead=%u\n", - fr->node_idx, dlm->reco.new_master, fr->dead_node); - BUG(); - } - if (dlm->reco.dead_node != fr->dead_node) { - mlog(ML_ERROR, "node %u sent recovery finalize msg for dead " - "node %u, but node %u is supposed to be dead\n", - fr->node_idx, fr->dead_node, dlm->reco.dead_node); - BUG(); - } - - switch (stage) { - case 1: - dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx); - if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) { - mlog(ML_ERROR, "%s: received finalize1 from " - "new master %u for dead node %u, but " - "this node has already received it!\n", - dlm->name, fr->node_idx, fr->dead_node); - dlm_print_reco_node_status(dlm); - BUG(); - } - dlm->reco.state |= DLM_RECO_STATE_FINALIZE; - spin_unlock(&dlm->spinlock); - break; - case 2: - if (!(dlm->reco.state & DLM_RECO_STATE_FINALIZE)) { - mlog(ML_ERROR, "%s: received finalize2 from " - "new master %u for dead node %u, but " - "this node did not have finalize1!\n", - dlm->name, fr->node_idx, fr->dead_node); - dlm_print_reco_node_status(dlm); - BUG(); - } - dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE; - spin_unlock(&dlm->spinlock); - dlm_reset_recovery(dlm); - dlm_kick_recovery_thread(dlm); - break; - default: - BUG(); - } - - mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n", - dlm->name, fr->node_idx, dlm->reco.dead_node, dlm->reco.new_master); - - dlm_put(dlm); - return 0; -} |