dm cache: fix spurious cell_defer when dealing with partial block at end of device
authorJoe Thornber <ejt@redhat.com>
Fri, 28 Nov 2014 09:48:25 +0000 (09:48 +0000)
committerMike Snitzer <snitzer@redhat.com>
Mon, 1 Dec 2014 16:30:13 +0000 (11:30 -0500)
commitf824a2af3dfbbb766c02e19df21f985bceadf0ee
tree64efe7b50085b22bf281825e34af5f8fc11a5372
parent1e32134a5a404e80bfb47fad8a94e9bbfcbdacc5
dm cache: fix spurious cell_defer when dealing with partial block at end of device

We never bother caching a partial block that is at the back end of the
origin device.  No cell ever gets locked, but the calling code was
assuming it was and trying to release it.

Now the code only releases if the cell has been set to a non NULL
value.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
drivers/md/dm-cache-target.c