lkml.org 
[lkml]   [2012]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 2/2]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>
---
block/blk-lib.c | 3 +++
1 file changed, 3 insertions(+)

Index: linux/block/blk-lib.c
===================================================================
--- linux.orig/block/blk-lib.c 2012-12-14 10:03:22.305422686 +0800
+++ linux/block/blk-lib.c 2012-12-14 10:08:50.577295672 +0800
@@ -48,6 +48,7 @@ int blkdev_issue_discard(struct block_de
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_de
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_de
atomic_inc(&bb.done);
submit_bio(type, bio);
}
+ blk_finish_plug(&plug);

/* Wait for bios in-flight */
if (!atomic_dec_and_test(&bb.done))

\
 
 \ /
  Last update: 2012-12-14 04:21    [W:0.164 / U:0.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site