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swap: do not send discards as barriers 

The swap code already uses synchronous discards, no need to add I/O barriers.

tj: superflous newlines removed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Hugh Dickins <hughd@google.com>
Tested-by: Nigel Cunningham <nigel@tuxonice.net>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig 2010-08-18 05:29:20 -04:00 committed by Jens Axboe
parent e045db80d0
commit 349f429eec
1 changed files with 3 additions and 6 deletions
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9
mm/swapfile.c
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@ -141,8 +141,7 @@ static int discard_swap(struct swap_info_struct *si)
nr_blocks = ((sector_t)se->nr_pages - 1) << (PAGE_SHIFT - 9);
if (nr_blocks) {
err = blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_KERNEL,
BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
nr_blocks, GFP_KERNEL, BLKDEV_IFL_WAIT);
if (err)
return err;
cond_resched();
@ -153,8 +152,7 @@ static int discard_swap(struct swap_info_struct *si)
nr_blocks = (sector_t)se->nr_pages << (PAGE_SHIFT - 9);
err = blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_KERNEL,
BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
nr_blocks, GFP_KERNEL, BLKDEV_IFL_WAIT);
if (err)
break;
@ -193,8 +191,7 @@ static void discard_swap_cluster(struct swap_info_struct *si,
start_block <<= PAGE_SHIFT - 9;
nr_blocks <<= PAGE_SHIFT - 9;
if (blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT |
BLKDEV_IFL_BARRIER))
nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT))
break;
}