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| author | Joe Thornber <ejt@redhat.com> | 2012-07-27 15:08:06 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-07-27 15:08:06 +0100 |
| commit | 600497013687516153cb82637acfe56f7eb9308a (patch) | |
| tree | d44382be55c68208ba7344dfaca8ade10e87c0d5 /drivers/md/dm-thin.c | |
| parent | 905386f82d08f66726912f303f3e6605248c60a3 (diff) | |
| download | linux-3.10-600497013687516153cb82637acfe56f7eb9308a.tar.gz linux-3.10-600497013687516153cb82637acfe56f7eb9308a.tar.bz2 linux-3.10-600497013687516153cb82637acfe56f7eb9308a.zip | |
dm thin: avoid unnecessarily breaking sharing for flushes
There's no need to break sharing, triggering a copy, for a write that has no
data (i.e. a flush).
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 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 423df92f1c1..7510cb3d571 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -1315,7 +1315,7 @@ static void process_shared_bio(struct thin_c *tc, struct bio *bio, if (bio_detain(pool->prison, &key, bio, &cell)) return; - if (bio_data_dir(bio) == WRITE) + if (bio_data_dir(bio) == WRITE && bio->bi_size) break_sharing(tc, bio, block, &key, lookup_result, cell); else { struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr; |