tree 99df505a980404508a8e38c69f3b22e9214aed92
parent 0d228ece59a35a9b9e8ff0d40653234a6d90f61e
author Anand Jain <anand.jain@oracle.com> 1541946138 +0800
committer David Sterba <dsterba@suse.com> 1545054694 +0100

btrfs: dev-replace: go back to suspend state if another EXCL_OP is running

In a secnario where balance and replace co-exists as below,

  - start balance
  - pause balance
  - start replace
  - reboot

and when system restarts, balance resumes first. Then the replace is
attempted to restart but will fail as the EXCL_OP lock is already held
by the balance. If so place the replace state back to
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED state.

Fixes: 010a47bde9420 ("btrfs: add proper safety check before resuming dev-replace")
CC: stable@vger.kernel.org # 4.18+
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>