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block: adjust blkdev_issue_discard for swap

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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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9
include/linux/blkdev.h
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@@ -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);
}
/*