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btrfs: scrub: add scrub_lock lockdep check in scrub_workers_get 

scrub_workers_refcnt is protected by scrub_lock, add lockdep_assert_held()
in scrub_workers_get().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Suggested-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2019-01-30 14:45:01 +08:00 committed by David Sterba
parent 1cec3f2716
commit eb4318e59a
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/scrub.c
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@ -3741,6 +3741,8 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
int max_active = fs_info->thread_pool_size;
lockdep_assert_held(&fs_info->scrub_lock);
if (fs_info->scrub_workers_refcnt == 0) {
fs_info->scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub",
flags, is_dev_replace ? 1 : max_active, 4);