block: add __blkdev_issue_discard
This is a version of blkdev_issue_discard which doesn't wait for the I/O to complete, but instead allows the caller to submit the final bio and/or chain it to others. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Signed-off-by: Sagi Grimberg <sagig@grimberg.me> Reviewed-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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Jens Axboe

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9082e87bfb
commit
38f2525533
@@ -1131,6 +1131,8 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
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extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
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extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
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extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
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sector_t nr_sects, gfp_t gfp_mask, int type, 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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