dm thin metadata: don't issue prefetches if a transaction abort has failed
authorJoe Thornber <ejt@redhat.com>
Tue, 1 Mar 2016 10:58:44 +0000 (10:58 +0000)
committerSasha Levin <sasha.levin@oracle.com>
Mon, 18 Apr 2016 12:50:53 +0000 (08:50 -0400)
commit78243d0a1221f06af96a8952cd5ac71cd1fe5376
tree04bac5b059fa7045cfd20f359687d3069ac40fe9
parent14a33fc00969143f9d5935f486f238e98cc839d8
dm thin metadata: don't issue prefetches if a transaction abort has failed

[ Upstream commit 2eae9e4489b4cf83213fa3bd508b5afca3f01780 ]

If a transaction abort has failed then we can no longer use the metadata
device.  Typically this happens if the superblock is unreadable.

This fix addresses a crash seen during metadata device failure testing.

Fixes: 8a01a6af75 ("dm thin: prefetch missing metadata pages")
Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
drivers/md/dm-thin-metadata.c