diff options
Diffstat (limited to 'fs/ocfs2/dlm/dlmrecovery.c')
| -rw-r--r-- | fs/ocfs2/dlm/dlmrecovery.c | 2982 |
1 files changed, 2982 insertions, 0 deletions
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c new file mode 100644 index 000000000..802636d50 --- /dev/null +++ b/fs/ocfs2/dlm/dlmrecovery.c @@ -0,0 +1,2982 @@ +/* -*- 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); +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); + +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-%s", dlm->name); + 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) +{ + assert_spin_locked(&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; +} + +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); + + if (dlm->migrate_done) { + mlog(0, "%s: no need do recovery after migrating all " + "lock resources\n", dlm->name); + spin_unlock(&dlm->spinlock); + return 0; + } + + /* 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); + + /* take write barrier */ + /* (stops the list reshuffling thread, proxy ast handling) */ + dlm_begin_recovery(dlm); + + spin_unlock(&dlm->spinlock); + + 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); + spin_lock(&dlm->spinlock); + __dlm_reset_recovery(dlm); + dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE; + spin_unlock(&dlm->spinlock); + } + 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; + + /* Set this flag on recovery master to avoid + * a new recovery for another dead node start + * before the recovery is not done. That may + * cause recovery hung.*/ + spin_lock(&dlm->spinlock); + dlm->reco.state |= DLM_RECO_STATE_FINALIZE; + spin_unlock(&dlm->spinlock); + + /* 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); + + 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); + 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) +{ + 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; + int ret; + int status; + + 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 = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key, + &lr, sizeof(lr), request_from, &status); + + /* 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); + else + ret = status; + // 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); + /* Can't schedule DLM_UNLOCK_FREE_LOCK + * - do manually */ + 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; + unsigned int hash; + + if (!dlm_grab(dlm)) + return -EINVAL; + + if (!dlm_joined(dlm)) { + mlog(ML_ERROR, "Domain %s not joined! " + "lockres %.*s, master %u\n", + dlm->name, mres->lockname_len, + mres->lockname, mres->master); + dlm_put(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. */ + hash = dlm_lockid_hash(mres->lockname, mres->lockname_len); + spin_lock(&dlm->spinlock); + res = __dlm_lookup_lockres_full(dlm, mres->lockname, mres->lockname_len, + hash); + if (res) { + /* this will get a ref on res */ + /* mark it as recovering/migrating and hash it */ + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_DROPPING_REF) { + mlog(0, "%s: node is attempting to migrate " + "lockres %.*s, but marked as dropping " + " ref!\n", dlm->name, + mres->lockname_len, mres->lockname); + ret = -EINVAL; + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + dlm_lockres_put(res); + goto leave; + } + + 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); + spin_unlock(&dlm->spinlock); + dlm_lockres_put(res); + goto leave; + } + res->state |= DLM_LOCK_RES_MIGRATING; + } + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + } else { + spin_unlock(&dlm->spinlock); + /* 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) { + kfree(buf); + 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); + +resend: + ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key, + &req, sizeof(req), nodenum, &status); + 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 if (status == -ENOMEM) { + mlog_errno(status); + msleep(50); + goto resend; + } 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; + int dispatched = 0; + + 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(ret); + spin_unlock(&res->spinlock); + dlm_lockres_put(res); + spin_unlock(&dlm->spinlock); + dlm_put(dlm); + /* sender will take care of this and retry */ + return ret; + } else { + dispatched = 1; + __dlm_lockres_grab_inflight_worker(dlm, res); + spin_unlock(&res->spinlock); + } + } else { + /* put.. incase we are not the master */ + spin_unlock(&res->spinlock); + dlm_lockres_put(res); + } + } + spin_unlock(&dlm->spinlock); + + if (!dispatched) + 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, *iter; + 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; + u8 from = O2NM_MAX_NODES; + __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); + 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)); + + lock = NULL; + 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(iter, tmpq) { + lock = list_entry(iter, + struct dlm_lock, list); + if (lock->ml.cookie == ml->cookie) + break; + lock = NULL; + } + 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); + + 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 the lock is in the blocked list it can't have a valid lvb, + * so skip it + */ + if (ml->list == DLM_BLOCKED_LIST) + 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); + if (mres->flags & DLM_MRES_RECOVERY && + ml->list == DLM_CONVERTING_LIST && + newlock->ml.type > + newlock->ml.convert_type) { + /* newlock is doing downconvert, add it to the + * head of converting list */ + list_add(&newlock->list, queue); + } else + 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); + } + 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); + + 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 */ + 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_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, bucket, hash_node) { + if (res->state & DLM_LOCK_RES_RECOVERY_WAITING) { + spin_lock(&res->spinlock); + res->state &= ~DLM_LOCK_RES_RECOVERY_WAITING; + spin_unlock(&res->spinlock); + wake_up(&res->wq); + } + + 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); + } + res->state |= DLM_LOCK_RES_RECOVERY_WAITING; + 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); +} + +static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node) +{ + struct dlm_lock_resource *res; + int i; + struct hlist_head *bucket; + struct hlist_node *tmp; + 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_safe(res, tmp, 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); + /* Can't schedule + * DLM_UNLOCK_FREE_LOCK + * - do manually */ + dlm_lock_put(lock); + break; + } + } + + if ((res->owner == dead_node) && + (res->state & DLM_LOCK_RES_DROPPING_REF)) { + dlm_lockres_get(res); + __dlm_do_purge_lockres(dlm, res); + spin_unlock(&res->spinlock); + wake_up(&res->wq); + dlm_lockres_put(res); + continue; + } else if (res->owner == dlm->node_num) + dlm_lockres_clear_refmap_bit(dlm, res, dead_node); + 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(0, "%s:%.*s: owned by " + "dead node %u, this node was " + "dropping its ref when master died. " + "continue, purging the lockres.\n", + dlm->name, res->lockname.len, + res->lockname.name, dead_node); + dlm_lockres_get(res); + __dlm_do_purge_lockres(dlm, res); + spin_unlock(&res->spinlock); + wake_up(&res->wq); + dlm_lockres_put(res); + continue; + } + 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); + } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { + 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); + } + } + 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); + + 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); + dlm_put(dlm); + 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; + __dlm_reset_recovery(dlm); + spin_unlock(&dlm->spinlock); + dlm_kick_recovery_thread(dlm); + break; + } + + 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; +} |