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block: adjust blkdev_issue_discard for swap 

Two mods to blkdev_issue_discard(), thinking ahead to its use on swap:

1. Add gfp_mask argument, so swap allocation can use it where GFP_KERNEL
   might deadlock but GFP_NOIO is safe.

2. Enlarge nr_sects argument from unsigned to sector_t: unsigned long is
   enough to cover a whole swap area, but sector_t suits any partition.

Change sb_issue_discard()'s nr_blocks to sector_t too; but no need seen
for a gfp_mask there, just pass GFP_KERNEL down to blkdev_issue_discard().

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Hugh Dickins 2008-09-11 10:57:55 +02:00 committed by Jens Axboe
parent 4677735f03
commit 3e6053d76d
2 changed files with 9 additions and 7 deletions
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7
block/blk-barrier.c
View File

@ -332,12 +332,13 @@ static void blkdev_discard_end_io(struct bio *bio, int err)
* @bdev: blockdev to issue discard for
* @sector: start sector
* @nr_sects: number of sectors to discard
* @gfp_mask: memory allocation flags (for bio_alloc)
*
* Description:
* Issue a discard request for the sectors in question. Does not wait.
*/
int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
unsigned nr_sects)
int blkdev_issue_discard(struct block_device *bdev,
sector_t sector, sector_t nr_sects, gfp_t gfp_mask)
{
struct request_queue *q;
struct bio *bio;
@ -354,7 +355,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
return -EOPNOTSUPP;
while (nr_sects && !ret) {
bio = bio_alloc(GFP_KERNEL, 0);
bio = bio_alloc(gfp_mask, 0);
if (!bio)
return -ENOMEM;

9
include/linux/blkdev.h
View File

@ -16,6 +16,7 @@
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/stringify.h>
#include <linux/gfp.h>
#include <linux/bsg.h>
#include <linux/smp.h>
@ -873,15 +874,15 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
}
extern int blkdev_issue_flush(struct block_device *, sector_t *);
extern int blkdev_issue_discard(struct block_device *, sector_t sector,
unsigned nr_sects);
extern int blkdev_issue_discard(struct block_device *,
sector_t sector, sector_t nr_sects, gfp_t);
static inline int sb_issue_discard(struct super_block *sb,
sector_t block, unsigned nr_blocks)
sector_t block, sector_t nr_blocks)
{
block <<= (sb->s_blocksize_bits - 9);
nr_blocks <<= (sb->s_blocksize_bits - 9);
return blkdev_issue_discard(sb->s_bdev, block, nr_blocks);
return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL);
}
/*