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block: add a new BLKDEV_ZERO_NOFALLBACK flag

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This avoids fallbacks to explicit zeroing in (__)blkdev_issue_zeroout if
the caller doesn't want them.

Also clean up the convoluted check for the return condition that this
new flag is added to.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-04-05 19:21:10 +02:00 • committed by Jens Axboe
parent d928be9f85
commit cb365b9675
2 changed files with 5 additions and 1 deletions
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1
include/linux/blkdev.h
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@ -1350,6 +1350,7 @@ extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
struct bio **biop);
#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,