tree 5277f63351808793d863e08fe5c2e395af29e254
parent 007d31f755294b9db69c3d18e90d6edae9f1604d
author Wang Shilong <wangsl.fnst@cn.fujitsu.com> 1381515072 +0800
committer Chris Mason <chris.mason@fusionio.com> 1384225978 -0500

Btrfs: avoid unnecessary scrub workers allocation

We only allocate scrub workers if we pass all the necessary
checks, for example, there are no operation in progress.

Besides, move mutex lock protection outside of scrub_workers_get()
/scrub_workers_put().

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>