This is a note to let you know that I've just added the patch titled
dm cache: only use overwrite optimisation for promotion when in writeback
mode
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-only-use-overwrite-optimisation-for-promotion-when-in-writeback-mode.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 <[email protected]> know about it.
>From f29a3147e251d7ae20d3194ff67f109d71e501b4 Mon Sep 17 00:00:00 2001
From: Joe Thornber <[email protected]>
Date: Thu, 27 Nov 2014 12:21:08 +0000
Subject: dm cache: only use overwrite optimisation for promotion when in
writeback mode
From: Joe Thornber <[email protected]>
commit f29a3147e251d7ae20d3194ff67f109d71e501b4 upstream.
Overwrite causes the cache block and origin blocks to diverge, which
is only allowed in writeback mode.
Signed-off-by: Joe Thornber <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/md/dm-cache-target.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1060,7 +1060,8 @@ static void issue_copy(struct dm_cache_m
avoid = is_discarded_oblock(cache, mg->new_oblock);
- if (!avoid && bio_writes_complete_block(cache, bio)) {
+ if (writeback_mode(&cache->features) &&
+ !avoid && bio_writes_complete_block(cache, bio)) {
issue_overwrite(mg, bio);
return;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/dm-space-map-metadata-fix-sm_bootstrap_get_nr_blocks.patch
queue-3.14/dm-thin-fix-missing-out-of-data-space-to-write-mode-transition-if-blocks-are-released.patch
queue-3.14/dm-thin-fix-inability-to-discard-blocks-when-in-out-of-data-space-mode.patch
queue-3.14/dm-cache-only-use-overwrite-optimisation-for-promotion-when-in-writeback-mode.patch
queue-3.14/dm-cache-dirty-flag-was-mistakenly-being-cleared-when-promoting-via-overwrite.patch
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