This is a note to let you know that I've just added the patch titled
dm thin: fix inability to discard blocks when in out-of-data-space 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-thin-fix-inability-to-discard-blocks-when-in-out-of-data-space-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 45ec9bd0fd7abf8705e7cf12205ff69fe9d51181 Mon Sep 17 00:00:00 2001
From: Joe Thornber <[email protected]>
Date: Wed, 10 Dec 2014 17:06:57 +0000
Subject: dm thin: fix inability to discard blocks when in out-of-data-space mode
From: Joe Thornber <[email protected]>
commit 45ec9bd0fd7abf8705e7cf12205ff69fe9d51181 upstream.
When the pool was in PM_OUT_OF_SPACE mode its process_prepared_discard
function pointer was incorrectly being set to
process_prepared_discard_passdown rather than process_prepared_discard.
This incorrect function pointer meant the discard was being passed down,
but not effecting the mapping. As such any discard that was issued, in
an attempt to reclaim blocks, would not successfully free data space.
Reported-by: Eric Sandeen <[email protected]>
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-thin.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1592,7 +1592,7 @@ static void set_pool_mode(struct pool *p
pool->process_bio = process_bio_read_only;
pool->process_discard = process_discard;
pool->process_prepared_mapping = process_prepared_mapping;
- pool->process_prepared_discard =
process_prepared_discard_passdown;
+ pool->process_prepared_discard = process_prepared_discard;
if (!pool->pf.error_if_no_space && no_space_timeout)
queue_delayed_work(pool->wq, &pool->no_space_timeout,
no_space_timeout);
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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