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authorWang Shilong <wangsl.fnst@cn.fujitsu.com>2013-10-25 19:12:02 +0800
committerChris Mason <chris.mason@fusionio.com>2013-11-11 22:10:13 -0500
commit9b011adfe14977fcda977234609d43ca52463a3d (patch)
treea96feceecabdc4bb71d8ff099a4317d3f8f1d9fe /fs/btrfs/volumes.h
parent7fdf4b608dda5eea114cb23623b52e34dd5972f5 (diff)
Btrfs: remove scrub_super_lock holding in btrfs_sync_log()
Originally, we introduced scrub_super_lock to synchronize tree log code with scrubbing super. However we can replace scrub_super_lock with device_list_mutex, because writing super will hold this mutex, this will reduce an extra lock holding when writing supers in sync log code. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
-rw-r--r--fs/btrfs/volumes.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index b72f540c8b29..49e0ff01143f 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -132,7 +132,9 @@ struct btrfs_fs_devices {
/* all of the devices in the FS, protected by a mutex
* so we can safely walk it to write out the supers without
- * worrying about add/remove by the multi-device code
+ * worrying about add/remove by the multi-device code.
+ * Scrubbing super can kick off supers writing by holding
+ * this mutex lock.
*/
struct mutex device_list_mutex;
struct list_head devices;