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block: add a flags argument to (__)blkdev_issue_zeroout

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Turn the existing discard flag into a new BLKDEV_ZERO_UNMAP flag with
similar semantics, but without referring to diѕcard.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-04-05 19:21:08 +02:00 • committed by Jens Axboe
commit ee472d835c
8 changed files with 35 additions and 31 deletions
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31
block/blk-lib.c
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@ -282,14 +282,18 @@ static int __blkdev_issue_write_zeroes(struct block_device *bdev,
* @nr_sects: number of sectors to write
* @gfp_mask: memory allocation flags (for bio_alloc)
* @biop: pointer to anchor bio
* @discard: discard flag
* @flags: controls detailed behavior
*
* Description:
* Generate and issue number of bios with zerofiled pages.
* Zero-fill a block range, either using hardware offload or by explicitly
* writing zeroes to the device.
*
* If a device is using logical block provisioning, the underlying space will
* not be released if %flags contains BLKDEV_ZERO_NOUNMAP.
*/
int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
bool discard)
unsigned flags)
{
int ret;
int bi_size = 0;
@ -337,28 +341,21 @@ EXPORT_SYMBOL(__blkdev_issue_zeroout);
* @sector: start sector
* @nr_sects: number of sectors to write
* @gfp_mask: memory allocation flags (for bio_alloc)
* @discard: whether to discard the block range
* @flags: controls detailed behavior
*
* Description:
* Zero-fill a block range. If the discard flag is set and the block
* device guarantees that subsequent READ operations to the block range
* in question will return zeroes, the blocks will be discarded. Should
* the discard request fail, if the discard flag is not set, or if
* discard_zeroes_data is not supported, this function will resort to
* zeroing the blocks manually, thus provisioning (allocating,
* anchoring) them. If the block device supports WRITE ZEROES or WRITE SAME
* command(s), blkdev_issue_zeroout() will use it to optimize the process of
* clearing the block range. Otherwise the zeroing will be performed
* using regular WRITE calls.
* Zero-fill a block range, either using hardware offload or by explicitly
* writing zeroes to the device. See __blkdev_issue_zeroout() for the
* valid values for %flags.
*/
int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, bool discard)
sector_t nr_sects, gfp_t gfp_mask, unsigned flags)
{
int ret;
struct bio *bio = NULL;
struct blk_plug plug;
if (discard) {
if (!(flags & BLKDEV_ZERO_NOUNMAP)) {
if (!blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask,
BLKDEV_DISCARD_ZERO))
return 0;
@ -366,7 +363,7 @@ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
blk_start_plug(&plug);
ret = __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask,
&bio, discard);
&bio, flags);
if (ret == 0 && bio) {
ret = submit_bio_wait(bio);
bio_put(bio);

2
block/ioctl.c
View file

@ -255,7 +255,7 @@ static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
truncate_inode_pages_range(mapping, start, end);
return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
false);
BLKDEV_ZERO_NOUNMAP);
}
static int put_ushort(unsigned long arg, unsigned short val)