tree 387f9b5918dcebac973f995cce88e710a04daf36
parent f9f5e90c212052f896cc2ffbbb062498dd026b1a
author Christoph Hellwig <hch@lst.de> 1501531693 -0500
committer Eric Sandeen <sandeen@redhat.com> 1501531693 -0500

xfs: fix multi-AG deadlock in xfs_bunmapi

Source kernel commit: 5b094d6dac0451ad89b1dc088395c7b399b7e9e8

Just like in the allocator we must avoid touching multiple AGs out of
order when freeing blocks, as freeing still locks the AGF and can cause
the same AB-BA deadlocks as in the allocation path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Nikolay Borisov <n.borisov.lkml@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>