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>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 1f3f9c59a73ab5be4ff4bb37f428364df7544706..68cda164dff66aa7424092d994987639e185b56e 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -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;
                }