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block: use blkdev_issue_discard in blk_ioctl_discard

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blk_ioctl_discard duplicates large amounts of code from blkdev_issue_discard,
the only difference between the two is that blkdev_issue_discard needs to
send a barrier discard request and blk_ioctl_discard a non-barrier one,
and blk_ioctl_discard needs to wait on the request.  To facilitates this
add a flags argument to blkdev_issue_discard to control both aspects of the
behaviour.  This will be very useful later on for using the waiting
funcitonality for other callers.

Based on an earlier patch from Matthew Wilcox <[email protected]>.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2009-09-12 07:35:43 +02:00 • committed by Jens Axboe
commit 746cd1e7e4
6 changed files with 37 additions and 67 deletions
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6
mm/swapfile.c
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@ -161,7 +161,8 @@ static int discard_swap(struct swap_info_struct *si)
}
err = blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_KERNEL);
nr_blocks, GFP_KERNEL,
DISCARD_FL_BARRIER);
if (err)
break;
@ -200,7 +201,8 @@ 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))
nr_blocks, GFP_NOIO,
DISCARD_FL_BARRIER))
break;
}