dm cache: make sure every metadata function checks fail_io

Otherwise operations may be attempted that will only ever go on to crash
(since the metadata device is either missing or unreliable if 'fail_io'
is set).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Joe Thornber 2016-03-10 16:20:58 +00:00 • committed by Mike Snitzer
commit d14fcf3dd7
3 changed files with 71 additions and 43 deletions