From 553abd046af609191a91af7289d87d477adc659f Mon Sep 17 00:00:00 2001 From: Joel Becker Date: Fri, 1 Feb 2008 12:03:57 -0800 Subject: ocfs2: Change the recovery map to an array of node numbers. The old recovery map was a bitmap of node numbers. This was sufficient for the maximum node number of 254. Going forward, we want node numbers to be UINT32. Thus, we need a new recovery map. Note that we can't keep track of slots here. We must write down the node number to recovery *before* we get the locks needed to convert a node number into a slot number. The recovery map is now an array of unsigned ints, max_slots in size. It moves to journal.c with the rest of recovery. Because it needs to be initialized, we move all of recovery initialization into a new function, ocfs2_recovery_init(). This actually cleans up ocfs2_initialize_super() a little as well. Following on, recovery cleaup becomes part of ocfs2_recovery_exit(). A number of node map functions are rendered obsolete and are removed. Finally, waiting on recovery is wrapped in a function rather than naked checks on the recovery_event. This is a cleanup from Mark. Signed-off-by: Joel Becker Signed-off-by: Mark Fasheh diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 1a80fa9..15a5167 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -1950,8 +1950,7 @@ int ocfs2_inode_lock_full(struct inode *inode, goto local; if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) - wait_event(osb->recovery_event, - ocfs2_node_map_is_empty(osb, &osb->recovery_map)); + ocfs2_wait_for_recovery(osb); lockres = &OCFS2_I(inode)->ip_inode_lockres; level = ex ? LKM_EXMODE : LKM_PRMODE; @@ -1974,8 +1973,7 @@ int ocfs2_inode_lock_full(struct inode *inode, * committed to owning this lock so we don't allow signals to * abort the operation. */ if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) - wait_event(osb->recovery_event, - ocfs2_node_map_is_empty(osb, &osb->recovery_map)); + ocfs2_wait_for_recovery(osb); local: /* diff --git a/fs/ocfs2/heartbeat.c b/fs/ocfs2/heartbeat.c index 0758daf..80de239 100644 --- a/fs/ocfs2/heartbeat.c +++ b/fs/ocfs2/heartbeat.c @@ -48,7 +48,6 @@ static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map, int bit); static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map, int bit); -static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map); /* special case -1 for now * TODO: should *really* make sure the calling func never passes -1!! */ @@ -62,7 +61,6 @@ static void ocfs2_node_map_init(struct ocfs2_node_map *map) void ocfs2_init_node_maps(struct ocfs2_super *osb) { spin_lock_init(&osb->node_map_lock); - ocfs2_node_map_init(&osb->recovery_map); ocfs2_node_map_init(&osb->osb_recovering_orphan_dirs); } @@ -192,112 +190,3 @@ int ocfs2_node_map_test_bit(struct ocfs2_super *osb, return ret; } -static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map) -{ - int bit; - bit = find_next_bit(map->map, map->num_nodes, 0); - if (bit < map->num_nodes) - return 0; - return 1; -} - -int ocfs2_node_map_is_empty(struct ocfs2_super *osb, - struct ocfs2_node_map *map) -{ - int ret; - BUG_ON(map->num_nodes == 0); - spin_lock(&osb->node_map_lock); - ret = __ocfs2_node_map_is_empty(map); - spin_unlock(&osb->node_map_lock); - return ret; -} - -#if 0 - -static void __ocfs2_node_map_dup(struct ocfs2_node_map *target, - struct ocfs2_node_map *from) -{ - BUG_ON(from->num_nodes == 0); - ocfs2_node_map_init(target); - __ocfs2_node_map_set(target, from); -} - -/* returns 1 if bit is the only bit set in target, 0 otherwise */ -int ocfs2_node_map_is_only(struct ocfs2_super *osb, - struct ocfs2_node_map *target, - int bit) -{ - struct ocfs2_node_map temp; - int ret; - - spin_lock(&osb->node_map_lock); - __ocfs2_node_map_dup(&temp, target); - __ocfs2_node_map_clear_bit(&temp, bit); - ret = __ocfs2_node_map_is_empty(&temp); - spin_unlock(&osb->node_map_lock); - - return ret; -} - -static void __ocfs2_node_map_set(struct ocfs2_node_map *target, - struct ocfs2_node_map *from) -{ - int num_longs, i; - - BUG_ON(target->num_nodes != from->num_nodes); - BUG_ON(target->num_nodes == 0); - - num_longs = BITS_TO_LONGS(target->num_nodes); - for (i = 0; i < num_longs; i++) - target->map[i] = from->map[i]; -} - -#endif /* 0 */ - -/* Returns whether the recovery bit was actually set - it may not be - * if a node is still marked as needing recovery */ -int ocfs2_recovery_map_set(struct ocfs2_super *osb, - int num) -{ - int set = 0; - - spin_lock(&osb->node_map_lock); - - if (!test_bit(num, osb->recovery_map.map)) { - __ocfs2_node_map_set_bit(&osb->recovery_map, num); - set = 1; - } - - spin_unlock(&osb->node_map_lock); - - return set; -} - -void ocfs2_recovery_map_clear(struct ocfs2_super *osb, - int num) -{ - ocfs2_node_map_clear_bit(osb, &osb->recovery_map, num); -} - -int ocfs2_node_map_iterate(struct ocfs2_super *osb, - struct ocfs2_node_map *map, - int idx) -{ - int i = idx; - - idx = O2NM_INVALID_NODE_NUM; - spin_lock(&osb->node_map_lock); - if ((i != O2NM_INVALID_NODE_NUM) && - (i >= 0) && - (i < map->num_nodes)) { - while(i < map->num_nodes) { - if (test_bit(i, map->map)) { - idx = i; - break; - } - i++; - } - } - spin_unlock(&osb->node_map_lock); - return idx; -} diff --git a/fs/ocfs2/heartbeat.h b/fs/ocfs2/heartbeat.h index eac63ae..98d8ffc 100644 --- a/fs/ocfs2/heartbeat.h +++ b/fs/ocfs2/heartbeat.h @@ -33,8 +33,6 @@ void ocfs2_stop_heartbeat(struct ocfs2_super *osb); /* node map functions - used to keep track of mounted and in-recovery * nodes. */ -int ocfs2_node_map_is_empty(struct ocfs2_super *osb, - struct ocfs2_node_map *map); void ocfs2_node_map_set_bit(struct ocfs2_super *osb, struct ocfs2_node_map *map, int bit); @@ -44,17 +42,5 @@ void ocfs2_node_map_clear_bit(struct ocfs2_super *osb, int ocfs2_node_map_test_bit(struct ocfs2_super *osb, struct ocfs2_node_map *map, int bit); -int ocfs2_node_map_iterate(struct ocfs2_super *osb, - struct ocfs2_node_map *map, - int idx); -static inline int ocfs2_node_map_first_set_bit(struct ocfs2_super *osb, - struct ocfs2_node_map *map) -{ - return ocfs2_node_map_iterate(osb, map, 0); -} -int ocfs2_recovery_map_set(struct ocfs2_super *osb, - int num); -void ocfs2_recovery_map_clear(struct ocfs2_super *osb, - int num); #endif /* OCFS2_HEARTBEAT_H */ diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c index ed0c6d0..ca4c0ea 100644 --- a/fs/ocfs2/journal.c +++ b/fs/ocfs2/journal.c @@ -64,6 +64,137 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb, int slot); static int ocfs2_commit_thread(void *arg); + +/* + * The recovery_list is a simple linked list of node numbers to recover. + * It is protected by the recovery_lock. + */ + +struct ocfs2_recovery_map { + int rm_used; + unsigned int *rm_entries; +}; + +int ocfs2_recovery_init(struct ocfs2_super *osb) +{ + struct ocfs2_recovery_map *rm; + + mutex_init(&osb->recovery_lock); + osb->disable_recovery = 0; + osb->recovery_thread_task = NULL; + init_waitqueue_head(&osb->recovery_event); + + rm = kzalloc(sizeof(struct ocfs2_recovery_map) + + osb->max_slots * sizeof(unsigned int), + GFP_KERNEL); + if (!rm) { + mlog_errno(-ENOMEM); + return -ENOMEM; + } + + rm->rm_entries = (unsigned int *)((char *)rm + + sizeof(struct ocfs2_recovery_map)); + osb->recovery_map = rm; + + return 0; +} + +/* we can't grab the goofy sem lock from inside wait_event, so we use + * memory barriers to make sure that we'll see the null task before + * being woken up */ +static int ocfs2_recovery_thread_running(struct ocfs2_super *osb) +{ + mb(); + return osb->recovery_thread_task != NULL; +} + +void ocfs2_recovery_exit(struct ocfs2_super *osb) +{ + struct ocfs2_recovery_map *rm; + + /* disable any new recovery threads and wait for any currently + * running ones to exit. Do this before setting the vol_state. */ + mutex_lock(&osb->recovery_lock); + osb->disable_recovery = 1; + mutex_unlock(&osb->recovery_lock); + wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb)); + + /* At this point, we know that no more recovery threads can be + * launched, so wait for any recovery completion work to + * complete. */ + flush_workqueue(ocfs2_wq); + + /* + * Now that recovery is shut down, and the osb is about to be + * freed, the osb_lock is not taken here. + */ + rm = osb->recovery_map; + /* XXX: Should we bug if there are dirty entries? */ + + kfree(rm); +} + +static int __ocfs2_recovery_map_test(struct ocfs2_super *osb, + unsigned int node_num) +{ + int i; + struct ocfs2_recovery_map *rm = osb->recovery_map; + + assert_spin_locked(&osb->osb_lock); + + for (i = 0; i < rm->rm_used; i++) { + if (rm->rm_entries[i] == node_num) + return 1; + } + + return 0; +} + +/* Behaves like test-and-set. Returns the previous value */ +static int ocfs2_recovery_map_set(struct ocfs2_super *osb, + unsigned int node_num) +{ + struct ocfs2_recovery_map *rm = osb->recovery_map; + + spin_lock(&osb->osb_lock); + if (__ocfs2_recovery_map_test(osb, node_num)) { + spin_unlock(&osb->osb_lock); + return 1; + } + + /* XXX: Can this be exploited? Not from o2dlm... */ + BUG_ON(rm->rm_used >= osb->max_slots); + + rm->rm_entries[rm->rm_used] = node_num; + rm->rm_used++; + spin_unlock(&osb->osb_lock); + + return 0; +} + +static void ocfs2_recovery_map_clear(struct ocfs2_super *osb, + unsigned int node_num) +{ + int i; + struct ocfs2_recovery_map *rm = osb->recovery_map; + + spin_lock(&osb->osb_lock); + + for (i = 0; i < rm->rm_used; i++) { + if (rm->rm_entries[i] == node_num) + break; + } + + if (i < rm->rm_used) { + /* XXX: be careful with the pointer math */ + memmove(&(rm->rm_entries[i]), &(rm->rm_entries[i + 1]), + (rm->rm_used - i - 1) * sizeof(unsigned int)); + rm->rm_used--; + } + + spin_unlock(&osb->osb_lock); +} + static int ocfs2_commit_cache(struct ocfs2_super *osb) { int status = 0; @@ -650,6 +781,23 @@ bail: return status; } +static int ocfs2_recovery_completed(struct ocfs2_super *osb) +{ + int empty; + struct ocfs2_recovery_map *rm = osb->recovery_map; + + spin_lock(&osb->osb_lock); + empty = (rm->rm_used == 0); + spin_unlock(&osb->osb_lock); + + return empty; +} + +void ocfs2_wait_for_recovery(struct ocfs2_super *osb) +{ + wait_event(osb->recovery_event, ocfs2_recovery_completed(osb)); +} + /* * JBD Might read a cached version of another nodes journal file. We * don't want this as this file changes often and we get no @@ -848,6 +996,7 @@ static int __ocfs2_recovery_thread(void *arg) { int status, node_num; struct ocfs2_super *osb = arg; + struct ocfs2_recovery_map *rm = osb->recovery_map; mlog_entry_void(); @@ -863,26 +1012,29 @@ restart: goto bail; } - while(!ocfs2_node_map_is_empty(osb, &osb->recovery_map)) { - node_num = ocfs2_node_map_first_set_bit(osb, - &osb->recovery_map); - if (node_num == O2NM_INVALID_NODE_NUM) { - mlog(0, "Out of nodes to recover.\n"); - break; - } + spin_lock(&osb->osb_lock); + while (rm->rm_used) { + /* It's always safe to remove entry zero, as we won't + * clear it until ocfs2_recover_node() has succeeded. */ + node_num = rm->rm_entries[0]; + spin_unlock(&osb->osb_lock); status = ocfs2_recover_node(osb, node_num); - if (status < 0) { + if (!status) { + ocfs2_recovery_map_clear(osb, node_num); + } else { mlog(ML_ERROR, "Error %d recovering node %d on device (%u,%u)!\n", status, node_num, MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev)); mlog(ML_ERROR, "Volume requires unmount.\n"); - continue; } - ocfs2_recovery_map_clear(osb, node_num); + spin_lock(&osb->osb_lock); } + spin_unlock(&osb->osb_lock); + mlog(0, "All nodes recovered\n"); + ocfs2_super_unlock(osb, 1); /* We always run recovery on our own orphan dir - the dead @@ -893,8 +1045,7 @@ restart: bail: mutex_lock(&osb->recovery_lock); - if (!status && - !ocfs2_node_map_is_empty(osb, &osb->recovery_map)) { + if (!status && !ocfs2_recovery_completed(osb)) { mutex_unlock(&osb->recovery_lock); goto restart; } @@ -924,8 +1075,8 @@ void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num) /* People waiting on recovery will wait on * the recovery map to empty. */ - if (!ocfs2_recovery_map_set(osb, node_num)) - mlog(0, "node %d already be in recovery.\n", node_num); + if (ocfs2_recovery_map_set(osb, node_num)) + mlog(0, "node %d already in recovery map.\n", node_num); mlog(0, "starting recovery thread...\n"); @@ -1197,7 +1348,7 @@ int ocfs2_mark_dead_nodes(struct ocfs2_super *osb) if (status == -ENOENT) continue; - if (ocfs2_node_map_test_bit(osb, &osb->recovery_map, node_num)) + if (__ocfs2_recovery_map_test(osb, node_num)) continue; spin_unlock(&osb->osb_lock); diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h index 220f3e8..db82be2 100644 --- a/fs/ocfs2/journal.h +++ b/fs/ocfs2/journal.h @@ -134,6 +134,10 @@ static inline void ocfs2_inode_set_new(struct ocfs2_super *osb, /* Exported only for the journal struct init code in super.c. Do not call. */ void ocfs2_complete_recovery(struct work_struct *work); +void ocfs2_wait_for_recovery(struct ocfs2_super *osb); + +int ocfs2_recovery_init(struct ocfs2_super *osb); +void ocfs2_recovery_exit(struct ocfs2_super *osb); /* * Journal Control: diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index ee3f675..c6ed8c3 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -180,6 +180,7 @@ enum ocfs2_mount_options struct ocfs2_journal; struct ocfs2_slot_info; +struct ocfs2_recovery_map; struct ocfs2_super { struct task_struct *commit_task; @@ -191,7 +192,6 @@ struct ocfs2_super struct ocfs2_slot_info *slot_info; spinlock_t node_map_lock; - struct ocfs2_node_map recovery_map; u64 root_blkno; u64 system_dir_blkno; @@ -226,6 +226,7 @@ struct ocfs2_super atomic_t vol_state; struct mutex recovery_lock; + struct ocfs2_recovery_map *recovery_map; struct task_struct *recovery_thread_task; int disable_recovery; wait_queue_head_t checkpoint_event; diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index fad37af..1a4c7c7 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -1224,15 +1224,6 @@ leave: return status; } -/* we can't grab the goofy sem lock from inside wait_event, so we use - * memory barriers to make sure that we'll see the null task before - * being woken up */ -static int ocfs2_recovery_thread_running(struct ocfs2_super *osb) -{ - mb(); - return osb->recovery_thread_task != NULL; -} - static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err) { int tmp; @@ -1249,17 +1240,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err) ocfs2_truncate_log_shutdown(osb); - /* disable any new recovery threads and wait for any currently - * running ones to exit. Do this before setting the vol_state. */ - mutex_lock(&osb->recovery_lock); - osb->disable_recovery = 1; - mutex_unlock(&osb->recovery_lock); - wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb)); - - /* At this point, we know that no more recovery threads can be - * launched, so wait for any recovery completion work to - * complete. */ - flush_workqueue(ocfs2_wq); + /* This will disable recovery and flush any recovery work. */ + ocfs2_recovery_exit(osb); ocfs2_journal_shutdown(osb); @@ -1368,7 +1350,6 @@ static int ocfs2_initialize_super(struct super_block *sb, osb->s_sectsize_bits = blksize_bits(sector_size); BUG_ON(!osb->s_sectsize_bits); - init_waitqueue_head(&osb->recovery_event); spin_lock_init(&osb->dc_task_lock); init_waitqueue_head(&osb->dc_event); osb->dc_work_sequence = 0; @@ -1388,10 +1369,12 @@ static int ocfs2_initialize_super(struct super_block *sb, snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u", MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev)); - mutex_init(&osb->recovery_lock); - - osb->disable_recovery = 0; - osb->recovery_thread_task = NULL; + status = ocfs2_recovery_init(osb); + if (status) { + mlog(ML_ERROR, "Unable to initialize recovery state\n"); + mlog_errno(status); + goto bail; + } init_waitqueue_head(&osb->checkpoint_event); atomic_set(&osb->needs_checkpoint, 0); -- cgit v0.10.2