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Btrfs: remove scrub_super_lock holding in btrfs_sync_log()

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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>
This commit is contained in:
Wang Shilong
2013-10-25 19:12:02 +08:00
committed by Chris Mason
parent 7fdf4b608d
commit 9b011adfe1
5 changed files with 8 additions and 20 deletions
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4
fs/btrfs/volumes.h
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@@ -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;