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Date: Wed, 25 Aug 2010 17:47:46 +0200
From: Tejun Heo <tj@...nel.org>
To: jaxboe@...ionio.com, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-ide@...r.kernel.org, linux-raid@...r.kernel.org, hch@....de,
James.Bottomley@...e.de, tytso@....edu, chris.mason@...cle.com,
swhiteho@...hat.com, konishi.ryusuke@....ntt.co.jp,
dm-devel@...hat.com, vst@...b.net, jack@...e.cz,
rwheeler@...hat.com, hare@...e.de, neilb@...e.de,
rusty@...tcorp.com.au, mst@...hat.com, jeremy@...p.org,
snitzer@...hat.com, k-ueda@...jp.nec.com
Cc: Christoph Hellwig <hch@...radead.org>, Tejun Heo <tj@...nel.org>
Subject: [PATCH 29/30] block: remove the BLKDEV_IFL_BARRIER flag
From: Christoph Hellwig <hch@...radead.org>
Remove support for barriers on discards, which is unused now. Also
remove the DISCARD_NOBARRIER I/O type in favour of just setting the
rw flags up locally in blkdev_issue_discard.
tj: Also remove DISCARD_SECURE and use REQ_SECURE directly.
Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
---
block/blk-lib.c | 18 ++----------------
include/linux/blkdev.h | 2 --
include/linux/fs.h | 8 --------
3 files changed, 2 insertions(+), 26 deletions(-)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index c392029..fe2e6ed 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -39,8 +39,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
{
DECLARE_COMPLETION_ONSTACK(wait);
struct request_queue *q = bdev_get_queue(bdev);
- int type = flags & BLKDEV_IFL_BARRIER ?
- DISCARD_BARRIER : DISCARD_NOBARRIER;
+ int type = REQ_WRITE | REQ_DISCARD;
unsigned int max_discard_sectors;
struct bio *bio;
int ret = 0;
@@ -65,7 +64,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
if (flags & BLKDEV_IFL_SECURE) {
if (!blk_queue_secdiscard(q))
return -EOPNOTSUPP;
- type |= DISCARD_SECURE;
+ type |= REQ_SECURE;
}
while (nr_sects && !ret) {
@@ -162,12 +161,6 @@ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
bb.wait = &wait;
bb.end_io = NULL;
- if (flags & BLKDEV_IFL_BARRIER) {
- /* issue async barrier before the data */
- ret = blkdev_issue_flush(bdev, gfp_mask, NULL, 0);
- if (ret)
- return ret;
- }
submit:
ret = 0;
while (nr_sects != 0) {
@@ -199,13 +192,6 @@ submit:
issued++;
submit_bio(WRITE, bio);
}
- /*
- * When all data bios are in flight. Send final barrier if requeted.
- */
- if (nr_sects == 0 && flags & BLKDEV_IFL_BARRIER)
- ret = blkdev_issue_flush(bdev, gfp_mask, NULL,
- flags & BLKDEV_IFL_WAIT);
-
if (flags & BLKDEV_IFL_WAIT)
/* Wait for bios in-flight */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 6b305eb..cfcb3a6 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -869,11 +869,9 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
}
enum{
BLKDEV_WAIT, /* wait for completion */
- BLKDEV_BARRIER, /* issue request with barrier */
BLKDEV_SECURE, /* secure discard */
};
#define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT)
-#define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER)
#define BLKDEV_IFL_SECURE (1 << BLKDEV_SECURE)
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *,
unsigned long);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 352c486..32703a9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -166,14 +166,6 @@ struct inodes_stat_t {
#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
REQ_FLUSH | REQ_FUA)
-/*
- * These aren't really reads or writes, they pass down information about
- * parts of device that are now unused by the file system.
- */
-#define DISCARD_NOBARRIER (WRITE | REQ_DISCARD)
-#define DISCARD_BARRIER (WRITE | REQ_DISCARD | REQ_HARDBARRIER)
-#define DISCARD_SECURE (DISCARD_NOBARRIER | REQ_SECURE)
-
#define SEL_IN 1
#define SEL_OUT 2
#define SEL_EX 4
--
1.7.1
--
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