tree 2e02ffad4235261cdb04b1eca1cbc9e7e83a3798
parent b66f00da0cfceb856c17706b77906b63437f6fda
author Stefan Behrens <sbehrens@giantdisaster.de> 1354032621 +0000
committer Chris Mason <chris.mason@fusionio.com> 1355708773 -0500

Btrfs: fix race in check-integrity caused by usage of bitfield

The structure member mirror_num is modified concurrently to the
structure member is_iodone. This doesn't require any locking by
design, unless everything is stored in the same 32 bits of a
bit field. This was the case and xfstest 284 was able to
trigger false warnings from the checker code. This patch
seperates the bits and fixes the race.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>