tree a96feceecabdc4bb71d8ff099a4317d3f8f1d9fe
parent 7fdf4b608dda5eea114cb23623b52e34dd5972f5
author Wang Shilong <wangsl.fnst@cn.fujitsu.com> 1382699522 +0800
committer Chris Mason <chris.mason@fusionio.com> 1384225813 -0500

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>