diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2014-02-06 06:08:56 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-06 22:06:30 -0800 |
| commit | 5a6ffcbbf827518ada88e9ac38ae88c6709a6c87 (patch) | |
| tree | 19705fa8fb71fcdc9b252ec1bb7ce47dcab0d3bf | |
| parent | f755b3dbadd5a8d72a21cad3cdaf74d18737f0a6 (diff) | |
| download | lwn-5a6ffcbbf827518ada88e9ac38ae88c6709a6c87.tar.gz lwn-5a6ffcbbf827518ada88e9ac38ae88c6709a6c87.zip | |
dm thin: avoid metadata commit if a pool's thin devices haven't changed
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@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 17 | ||||
| -rw-r--r-- | drivers/md/dm-thin-metadata.h | 2 | ||||
| -rw-r--r-- | drivers/md/dm-thin.c | 3 |
3 files changed, 21 insertions, 1 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index 7da347665552..3bb4506582a9 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -1489,6 +1489,23 @@ bool dm_thin_changed_this_transaction(struct dm_thin_device *td) 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; diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h index 2edf5dbac76a..c6d123bb768a 100644 --- 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_device *td, dm_block_t block); */ 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, diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index bc0c97d7921e..f406b0168962 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -1354,7 +1354,8 @@ static void process_deferred_bios(struct pool *pool) 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)) { |