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| author | Miao Xie <miaox@cn.fujitsu.com> | 2012-09-06 12:04:27 +0200 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2012-10-01 21:19:12 +0200 |
| commit | 2ecb79239bcd04c9d410f4cdce16adb6840b19da (patch) | |
| tree | 9a2194dde73a1a822fa011c35745c3aafa316f86 /fs/btrfs/tree-log.c | |
| parent | Btrfs: fix wrong size for the reservation of the, snapshot creation (diff) | |
| download | linux-2ecb79239bcd04c9d410f4cdce16adb6840b19da.tar.xz linux-2ecb79239bcd04c9d410f4cdce16adb6840b19da.zip | |
Btrfs: fix unprotected ->log_batch
We forget to protect ->log_batch when syncing a file, this patch fix
this problem by atomic operation. And ->log_batch is used to check
if there are parallel sync operations or not, so it is unnecessary to
reset it to 0 after the sync operation of the current log tree complete.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/tree-log.c')
| -rw-r--r-- | fs/btrfs/tree-log.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index f9b0fc911661..038a5229404a 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -147,7 +147,7 @@ static int start_log_trans(struct btrfs_trans_handle *trans, root->log_multiple_pids = true; } - root->log_batch++; + atomic_inc(&root->log_batch); atomic_inc(&root->log_writers); mutex_unlock(&root->log_mutex); return 0; @@ -166,7 +166,7 @@ static int start_log_trans(struct btrfs_trans_handle *trans, err = ret; } mutex_unlock(&root->fs_info->tree_log_mutex); - root->log_batch++; + atomic_inc(&root->log_batch); atomic_inc(&root->log_writers); mutex_unlock(&root->log_mutex); return err; @@ -2036,7 +2036,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, if (atomic_read(&root->log_commit[(index1 + 1) % 2])) wait_log_commit(trans, root, root->log_transid - 1); while (1) { - unsigned long batch = root->log_batch; + int batch = atomic_read(&root->log_batch); /* when we're on an ssd, just kick the log commit out */ if (!btrfs_test_opt(root, SSD) && root->log_multiple_pids) { mutex_unlock(&root->log_mutex); @@ -2044,7 +2044,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, mutex_lock(&root->log_mutex); } wait_for_writer(trans, root); - if (batch == root->log_batch) + if (batch == atomic_read(&root->log_batch)) break; } @@ -2073,7 +2073,6 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, btrfs_set_root_node(&log->root_item, log->node); - root->log_batch = 0; root->log_transid++; log->log_transid = root->log_transid; root->log_start_pid = 0; @@ -2086,7 +2085,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, mutex_unlock(&root->log_mutex); mutex_lock(&log_root_tree->log_mutex); - log_root_tree->log_batch++; + atomic_inc(&log_root_tree->log_batch); atomic_inc(&log_root_tree->log_writers); mutex_unlock(&log_root_tree->log_mutex); @@ -2156,7 +2155,6 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, btrfs_set_super_log_root_level(root->fs_info->super_for_commit, btrfs_header_level(log_root_tree->node)); - log_root_tree->log_batch = 0; log_root_tree->log_transid++; smp_mb(); |