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| author | Miao Xie <miaox@cn.fujitsu.com> | 2014-03-06 13:55:02 +0800 |
|---|---|---|
| committer | Josef Bacik <jbacik@fb.com> | 2014-03-10 15:17:28 -0400 |
| commit | 31f3d255c677073f83daa1e0671bbf2157bf8edc (patch) | |
| tree | 5a832934a4a886a7f62a21a4cfb1c678e3fab134 /fs/btrfs/ordered-data.c | |
| parent | 6c255e67cec1c38a0569c7f823eba63f9449ccf8 (diff) | |
| download | linux-31f3d255c677073f83daa1e0671bbf2157bf8edc.tar.bz2 | |
Btrfs: split the global ordered extents mutex
When we create a snapshot, we just need wait the ordered extents in
the source fs/file root, but because we use the global mutex to protect
this ordered extents list of the source fs/file root to avoid accessing
a empty list, if someone got the mutex to access the ordered extents list
of the other fs/file root, we had to wait.
This patch splits the above global mutex, now every fs/file root has
its own mutex to protect its own list.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Diffstat (limited to 'fs/btrfs/ordered-data.c')
| -rw-r--r-- | fs/btrfs/ordered-data.c | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index a75eaa286b8a..a94b05f72869 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -595,7 +595,7 @@ 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. */ -static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) +int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) { struct list_head splice, works; struct btrfs_ordered_extent *ordered, *next; @@ -604,6 +604,7 @@ static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) INIT_LIST_HEAD(&splice); INIT_LIST_HEAD(&works); + mutex_lock(&root->ordered_extent_mutex); spin_lock(&root->ordered_extent_lock); list_splice_init(&root->ordered_extents, &splice); while (!list_empty(&splice) && nr) { @@ -635,17 +636,7 @@ static 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); + mutex_unlock(&root->ordered_extent_mutex); return count; } @@ -670,7 +661,7 @@ 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); |