Btrfs: wrap repeated code into scrub_blocked_if_needed()
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>
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3cb0929a
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