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block: add async variant of blkdev_issue_zeroout
Similar to __blkdev_issue_discard this variant allows submitting the final bio asynchronously and chaining multiple ranges into a single completion. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Chaitanya Kulkarni
Jens Axboe
parent
b02d8aaea1
commit
e73c23ff73
113
block/blk-lib.c
113
block/blk-lib.c
@ -137,24 +137,24 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
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EXPORT_SYMBOL(blkdev_issue_discard);
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/**
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* blkdev_issue_write_same - queue a write same operation
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* __blkdev_issue_write_same - generate number of bios with same page
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* @bdev: target blockdev
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* @sector: start sector
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* @nr_sects: number of sectors to write
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* @gfp_mask: memory allocation flags (for bio_alloc)
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* @page: page containing data to write
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* @biop: pointer to anchor bio
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*
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* Description:
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* Issue a write same request for the sectors in question.
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* Generate and issue number of bios(REQ_OP_WRITE_SAME) with same page.
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*/
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int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask,
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struct page *page)
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static int __blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, struct page *page,
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struct bio **biop)
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{
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struct request_queue *q = bdev_get_queue(bdev);
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unsigned int max_write_same_sectors;
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struct bio *bio = NULL;
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int ret = 0;
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struct bio *bio = *biop;
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sector_t bs_mask;
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if (!q)
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@ -164,6 +164,9 @@ int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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if ((sector | nr_sects) & bs_mask)
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return -EINVAL;
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if (!bdev_write_same(bdev))
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return -EOPNOTSUPP;
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/* Ensure that max_write_same_sectors doesn't overflow bi_size */
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max_write_same_sectors = UINT_MAX >> 9;
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@ -185,32 +188,63 @@ int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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bio->bi_iter.bi_size = nr_sects << 9;
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nr_sects = 0;
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}
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cond_resched();
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}
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if (bio) {
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*biop = bio;
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return 0;
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}
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/**
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* blkdev_issue_write_same - queue a write same operation
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* @bdev: target blockdev
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* @sector: start sector
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* @nr_sects: number of sectors to write
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* @gfp_mask: memory allocation flags (for bio_alloc)
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* @page: page containing data
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*
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* Description:
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* Issue a write same request for the sectors in question.
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*/
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int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask,
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struct page *page)
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{
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struct bio *bio = NULL;
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struct blk_plug plug;
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int ret;
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blk_start_plug(&plug);
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ret = __blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask, page,
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&bio);
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if (ret == 0 && bio) {
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ret = submit_bio_wait(bio);
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bio_put(bio);
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}
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blk_finish_plug(&plug);
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return ret;
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}
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EXPORT_SYMBOL(blkdev_issue_write_same);
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/**
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* blkdev_issue_zeroout - generate number of zero filed write bios
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* __blkdev_issue_zeroout - generate number of zero filed write bios
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* @bdev: blockdev to issue
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* @sector: start sector
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* @nr_sects: number of sectors to write
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* @gfp_mask: memory allocation flags (for bio_alloc)
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* @biop: pointer to anchor bio
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* @discard: discard flag
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*
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* Description:
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* Generate and issue number of bios with zerofiled pages.
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*/
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static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask)
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int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
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bool discard)
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{
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int ret;
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struct bio *bio = NULL;
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int bi_size = 0;
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struct bio *bio = *biop;
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unsigned int sz;
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sector_t bs_mask;
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@ -218,6 +252,19 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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if ((sector | nr_sects) & bs_mask)
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return -EINVAL;
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if (discard) {
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ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask,
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BLKDEV_DISCARD_ZERO, biop);
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if (ret == 0 || (ret && ret != -EOPNOTSUPP))
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goto out;
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}
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ret = __blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask,
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ZERO_PAGE(0), biop);
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if (ret == 0 || (ret && ret != -EOPNOTSUPP))
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goto out;
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ret = 0;
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while (nr_sects != 0) {
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bio = next_bio(bio, min(nr_sects, (sector_t)BIO_MAX_PAGES),
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gfp_mask);
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@ -227,21 +274,20 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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while (nr_sects != 0) {
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sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects);
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ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0);
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nr_sects -= ret >> 9;
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sector += ret >> 9;
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if (ret < (sz << 9))
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bi_size = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0);
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nr_sects -= bi_size >> 9;
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sector += bi_size >> 9;
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if (bi_size < (sz << 9))
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break;
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}
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cond_resched();
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}
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if (bio) {
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ret = submit_bio_wait(bio);
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bio_put(bio);
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*biop = bio;
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out:
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL(__blkdev_issue_zeroout);
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/**
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* blkdev_issue_zeroout - zero-fill a block range
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@ -263,21 +309,22 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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* clearing the block range. Otherwise the zeroing will be performed
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* using regular WRITE calls.
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*/
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int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, bool discard)
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{
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if (discard) {
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if (!blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask,
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BLKDEV_DISCARD_ZERO))
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return 0;
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int ret;
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struct bio *bio = NULL;
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struct blk_plug plug;
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blk_start_plug(&plug);
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ret = __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask,
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&bio, discard);
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if (ret == 0 && bio) {
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ret = submit_bio_wait(bio);
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bio_put(bio);
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}
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blk_finish_plug(&plug);
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if (bdev_write_same(bdev) &&
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blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask,
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ZERO_PAGE(0)) == 0)
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return 0;
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return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask);
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return ret;
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}
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EXPORT_SYMBOL(blkdev_issue_zeroout);
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@ -1269,6 +1269,9 @@ extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
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struct bio **biop);
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extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, struct page *page);
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extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
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bool discard);
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extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, bool discard);
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static inline int sb_issue_discard(struct super_block *sb, sector_t block,
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