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| author | Miao Xie <miaox@cn.fujitsu.com> | 2014-03-06 13:54:55 +0800 |
|---|---|---|
| committer | Josef Bacik <jbacik@fb.com> | 2014-03-10 15:17:22 -0400 |
| commit | 8b9d83cd6bebe10e9965d2cef8053b02663eaad8 (patch) | |
| tree | 40603d4f493836043693f81cf658847017998d5f | |
| parent | 8257b2dc3c1a1057b84a589827354abdc4c767fd (diff) | |
| download | linux-8b9d83cd6bebe10e9965d2cef8053b02663eaad8.tar.gz linux-8b9d83cd6bebe10e9965d2cef8053b02663eaad8.tar.bz2 linux-8b9d83cd6bebe10e9965d2cef8053b02663eaad8.zip | |
Btrfs: fix early enospc due to the race of the two ordered extent wait
btrfs_wait_ordered_roots() moves all the list entries to a new list,
and then deals with them one by one. But if the other task invokes this
function at that time, it would get a empty list. It makes the enospc
error happens more early. Fix it.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
| -rw-r--r-- | fs/btrfs/ordered-data.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 751ee38083a9..73de19c37f5a 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -589,7 +589,7 @@ static void btrfs_run_ordered_extent_work(struct btrfs_work *work) * wait for all the ordered extents in a root. This is done when balancing * space between drives. */ -int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) +static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) { struct list_head splice, works; struct btrfs_ordered_extent *ordered, *next; @@ -598,7 +598,6 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) INIT_LIST_HEAD(&splice); INIT_LIST_HEAD(&works); - mutex_lock(&root->fs_info->ordered_operations_mutex); spin_lock(&root->ordered_extent_lock); list_splice_init(&root->ordered_extents, &splice); while (!list_empty(&splice) && nr) { @@ -630,6 +629,16 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) btrfs_put_ordered_extent(ordered); cond_resched(); } + + return count; +} + +int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) +{ + int count; + + mutex_lock(&root->fs_info->ordered_operations_mutex); + count = __btrfs_wait_ordered_extents(root, nr); mutex_unlock(&root->fs_info->ordered_operations_mutex); return count; @@ -643,6 +652,7 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr) INIT_LIST_HEAD(&splice); + mutex_lock(&fs_info->ordered_operations_mutex); spin_lock(&fs_info->ordered_root_lock); list_splice_init(&fs_info->ordered_roots, &splice); while (!list_empty(&splice) && nr) { @@ -654,7 +664,7 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr) &fs_info->ordered_roots); spin_unlock(&fs_info->ordered_root_lock); - done = btrfs_wait_ordered_extents(root, nr); + done = __btrfs_wait_ordered_extents(root, nr); btrfs_put_fs_root(root); spin_lock(&fs_info->ordered_root_lock); @@ -665,6 +675,7 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr) } list_splice_tail(&splice, &fs_info->ordered_roots); spin_unlock(&fs_info->ordered_root_lock); + mutex_unlock(&fs_info->ordered_operations_mutex); } /* |