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Commit 4afdd680 authored by Joe Thornber's avatar Joe Thornber Committed by Alasdair G Kergon
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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: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 40db5a53

drivers/md/dm-thin.c

+7 −1
Original line number Diff line number Diff line
@@ -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);