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| author |   Joe Thornber <ejt@redhat.com> | 2012-07-27 15:08:14 +0100 |
|---|---|---|
| committer |   Alasdair G Kergon <agk@redhat.com> | 2012-07-27 15:08:14 +0100 |
| commit | 4afdd680f7c106e1c87b6dd7af9751c282ecb4b0 (patch) | |
| tree | b5afcd97153a4a9e70823a2d0d2c33bfc2b51926 /drivers/md/dm-thin.c | |
| parent | dm thin metadata: add dm_thin_changed_this_transaction (diff) | |
| download | linux-dev-4afdd680f7c106e1c87b6dd7af9751c282ecb4b0.tar.xz linux-dev-4afdd680f7c106e1c87b6dd7af9751c282ecb4b0.zip | |
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/dm-thin.c')
| -rw-r--r-- | drivers/md/dm-thin.c | 8 |
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); |