Btrfs: wrap repeated code into scrub_blocked_if_needed()

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Just wrap same code into one function scrub_blocked_if_needed().

This make a change that we will move waiting (@workers_pending = 0)
before we can wake up commiting transaction(atomic_inc(@scrub_paused)),
we must take carefully to not deadlock here.

Thread 1			Thread 2
				|->btrfs_commit_transaction()
					|->set trans type(COMMIT_DOING)
					|->btrfs_scrub_paused()(blocked)
|->join_transaction(blocked)

Move btrfs_scrub_paused() before setting trans type which means we can
still join a transaction when commiting_transaction is blocked.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Suggested-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

...

This commit is contained in:

Wang Shilong 2013-12-04 21:16:53 +08:00 • committed by Chris Mason

parent 3cb0929ad2

commit cb7ab02156

2 changed files with 19 additions and 27 deletions

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43

fs/btrfs/scrub.c

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3

fs/btrfs/transaction.c

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