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| author | Shaohua Li <shli@kernel.org> | 2012-12-14 11:15:51 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-12-14 20:46:04 +0100 |
| commit | 0cfbcafcae8b7364b5fa96c2b26ccde7a3a296a9 (patch) | |
| tree | dc6601c000fc21c80db3f6861ac117359649429a /block | |
| parent | 8dd2cb7e880d2f77fba53b523c99133ad5054cfd (diff) | |
| download | lwn-0cfbcafcae8b7364b5fa96c2b26ccde7a3a296a9.tar.gz lwn-0cfbcafcae8b7364b5fa96c2b26ccde7a3a296a9.zip | |
block: add plug for blkdev_issue_discard
Last post of this patch appears lost, so I resend this.
Now discard merge works, add plug for blkdev_issue_discard. This will help
discard request merge especially for raid0 case. In raid0, a big discard
request is split to small requests, and if correct plug is added, such small
requests can be merged in low layer.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-lib.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 5677fd33d7d2..b3a1f2b70b31 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -48,6 +48,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, struct bio_batch bb; struct bio *bio; int ret = 0; + struct blk_plug plug; if (!q) return -ENXIO; @@ -82,6 +83,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, bb.flags = 1 << BIO_UPTODATE; bb.wait = &wait; + blk_start_plug(&plug); while (nr_sects) { unsigned int req_sects; sector_t end_sect, tmp; @@ -120,6 +122,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, atomic_inc(&bb.done); submit_bio(type, bio); } + blk_finish_plug(&plug); /* Wait for bios in-flight */ if (!atomic_dec_and_test(&bb.done)) |