This is a note to let you know that I've just added the patch titled
dm cache: always split discards on cache block boundaries
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-cache-always-split-discards-on-cache-block-boundaries.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f1daa838e861ae1a0fb7cd9721a21258430fcc8c Mon Sep 17 00:00:00 2001
From: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
Date: Fri, 23 May 2014 14:10:01 -0400
Subject: dm cache: always split discards on cache block boundaries
From: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
commit f1daa838e861ae1a0fb7cd9721a21258430fcc8c upstream.
The DM cache target cannot cope with discards that span multiple cache
blocks, so each discard bio that spans more than one cache block must
get split by the DM core.
Signed-off-by: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-cache-target.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2195,6 +2195,8 @@ static int cache_create(struct cache_arg
ti->num_discard_bios = 1;
ti->discards_supported = true;
ti->discard_zeroes_data_unsupported = true;
+ /* Discard bios must be split on a block boundary */
+ ti->split_discard_bios = true;
cache->features = ca->features;
ti->per_bio_data_size = get_per_bio_data_size(cache);
Patches currently in stable-queue which might be from heinzm@xxxxxxxxxx are
queue-3.14/dm-cache-always-split-discards-on-cache-block-boundaries.patch
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