This is a note to let you know that I've just added the patch titled
dm thin: avoid metadata commit if a pool's thin devices haven't changed
to the 3.13-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-avoid-metadata-commit-if-a-pool-s-thin-devices-haven-t-changed.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4d1662a30dde6e545086fe0e8fd7e474c4e0b639 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Thu, 6 Feb 2014 06:08:56 -0500
Subject: dm thin: avoid metadata commit if a pool's thin devices haven't changed
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 4d1662a30dde6e545086fe0e8fd7e474c4e0b639 upstream.
Commit 905e51b ("dm thin: commit outstanding data every second")
introduced a periodic commit. This commit occurs regardless of whether
any thin devices have made changes.
Fix the periodic commit to check if any of a pool's thin devices have
changed using dm_pool_changed_this_transaction().
Reported-by: Alexander Larsson <alexl@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-thin-metadata.c | 17 +++++++++++++++++
drivers/md/dm-thin-metadata.h | 2 ++
drivers/md/dm-thin.c | 3 ++-
3 files changed, 21 insertions(+), 1 deletion(-)
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1489,6 +1489,23 @@ bool dm_thin_changed_this_transaction(st
return r;
}
+bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd)
+{
+ bool r = false;
+ struct dm_thin_device *td, *tmp;
+
+ down_read(&pmd->root_lock);
+ list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
+ if (td->changed) {
+ r = td->changed;
+ break;
+ }
+ }
+ up_read(&pmd->root_lock);
+
+ return r;
+}
+
bool dm_thin_aborted_changes(struct dm_thin_device *td)
{
bool r;
--- a/drivers/md/dm-thin-metadata.h
+++ b/drivers/md/dm-thin-metadata.h
@@ -161,6 +161,8 @@ int dm_thin_remove_block(struct dm_thin_
*/
bool dm_thin_changed_this_transaction(struct dm_thin_device *td);
+bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd);
+
bool dm_thin_aborted_changes(struct dm_thin_device *td);
int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1354,7 +1354,8 @@ static void process_deferred_bios(struct
bio_list_init(&pool->deferred_flush_bios);
spin_unlock_irqrestore(&pool->lock, flags);
- if (bio_list_empty(&bios) && !need_commit_due_to_time(pool))
+ if (bio_list_empty(&bios) &&
+ !(dm_pool_changed_this_transaction(pool->pmd) && need_commit_due_to_time(pool)))
return;
if (commit(pool)) {
Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are
queue-3.13/dm-mpath-fix-stalls-when-handling-invalid-ioctls.patch
queue-3.13/dm-thin-avoid-metadata-commit-if-a-pool-s-thin-devices-haven-t-changed.patch
queue-3.13/dm-thin-fix-the-error-path-for-the-thin-device-constructor.patch
queue-3.13/dm-cache-move-hook_info-into-common-portion-of-per_bio_data-structure.patch
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