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authorJoe Thornber <ejt@redhat.com>2012-07-27 15:08:14 +0100
committerAlasdair G Kergon <agk@redhat.com>2012-07-27 15:08:14 +0100
commit4afdd680f7c106e1c87b6dd7af9751c282ecb4b0 (patch)
treeb5afcd97153a4a9e70823a2d0d2c33bfc2b51926 /drivers/md
parent40db5a537655aa0b17a82a4b5596f8d27400edd8 (diff)
downloadlinux-4afdd680f7c106e1c87b6dd7af9751c282ecb4b0.tar.bz2
dm thin: reduce number of metadata commits
Reduce the number of metadata commits by using dm_thin_changed_this_transaction to check if metadata was changed on a per thin device granularity. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-thin.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index bc9d08c0218b..98c50f9626d8 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -707,6 +707,12 @@ static void remap_to_origin(struct thin_c *tc, struct bio *bio)
bio->bi_bdev = tc->origin_dev->bdev;
}
+static int bio_triggers_commit(struct thin_c *tc, struct bio *bio)
+{
+ return (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) &&
+ dm_thin_changed_this_transaction(tc->td);
+}
+
static void issue(struct thin_c *tc, struct bio *bio)
{
struct pool *pool = tc->pool;
@@ -716,7 +722,7 @@ static void issue(struct thin_c *tc, struct bio *bio)
* Batch together any FUA/FLUSH bios we find and then issue
* a single commit for them in process_deferred_bios().
*/
- if (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) {
+ if (bio_triggers_commit(tc, bio)) {
spin_lock_irqsave(&pool->lock, flags);
bio_list_add(&pool->deferred_flush_bios, bio);
spin_unlock_irqrestore(&pool->lock, flags);