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| author | Wang Shilong <wangsl.fnst@cn.fujitsu.com> | 2013-10-25 13:12:02 +0200 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-11-12 04:10:13 +0100 |
| commit | 9b011adfe14977fcda977234609d43ca52463a3d (patch) | |
| tree | a96feceecabdc4bb71d8ff099a4317d3f8f1d9fe /fs/btrfs/volumes.h | |
| parent | Btrfs: use 'u64' rather than 'int' to get extent's generation (diff) | |
| download | linux-9b011adfe14977fcda977234609d43ca52463a3d.tar.xz linux-9b011adfe14977fcda977234609d43ca52463a3d.zip | |
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.h | 4 |
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; |