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>

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 700d248..ccbce2b 100644 (file)
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -22,45 +22,25 @@ static struct bio *next_bio(struct bio *bio, int rw, unsigned int nr_pages,
        return new;
 }
 
-/**
- * blkdev_issue_discard - queue a discard
- * @bdev:      blockdev to issue discard for
- * @sector:    start sector
- * @nr_sects:  number of sectors to discard
- * @gfp_mask:  memory allocation flags (for bio_alloc)
- * @flags:     BLKDEV_IFL_* flags to control behaviour
- *
- * Description:
- *    Issue a discard request for the sectors in question.
- */
-int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
-               sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
+int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
+               sector_t nr_sects, gfp_t gfp_mask, int type, struct bio **biop)
 {
        struct request_queue *q = bdev_get_queue(bdev);
-       int type = REQ_WRITE | REQ_DISCARD;
+       struct bio *bio = *biop;
        unsigned int granularity;
        int alignment;
-       struct bio *bio = NULL;
-       int ret = 0;
-       struct blk_plug plug;
 
        if (!q)
                return -ENXIO;
-
        if (!blk_queue_discard(q))
                return -EOPNOTSUPP;
+       if ((type & REQ_SECURE) && !blk_queue_secdiscard(q))
+               return -EOPNOTSUPP;
 
        /* Zero-sector (unknown) and one-sector granularities are the same.  */
        granularity = max(q->limits.discard_granularity >> 9, 1U);
        alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
 
-       if (flags & BLKDEV_DISCARD_SECURE) {
-               if (!blk_queue_secdiscard(q))
-                       return -EOPNOTSUPP;
-               type |= REQ_SECURE;
-       }
-
-       blk_start_plug(&plug);
        while (nr_sects) {
                unsigned int req_sects;
                sector_t end_sect, tmp;
@@ -98,7 +78,38 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
                 */
                cond_resched();
        }
-       if (bio)
+
+       *biop = bio;
+       return 0;
+}
+EXPORT_SYMBOL(__blkdev_issue_discard);
+
+/**
+ * blkdev_issue_discard - queue a discard
+ * @bdev:      blockdev to issue discard for
+ * @sector:    start sector
+ * @nr_sects:  number of sectors to discard
+ * @gfp_mask:  memory allocation flags (for bio_alloc)
+ * @flags:     BLKDEV_IFL_* flags to control behaviour
+ *
+ * Description:
+ *    Issue a discard request for the sectors in question.
+ */
+int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
+               sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
+{
+       int type = REQ_WRITE | REQ_DISCARD;
+       struct bio *bio = NULL;
+       struct blk_plug plug;
+       int ret;
+
+       if (flags & BLKDEV_DISCARD_SECURE)
+               type |= REQ_SECURE;
+
+       blk_start_plug(&plug);
+       ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, type,
+                       &bio);
+       if (!ret && bio)
                ret = submit_bio_wait(type, bio);
        blk_finish_plug(&plug);
 

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ba72687..b79131a 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1131,6 +1131,8 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
 extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
                sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
+extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
+               sector_t nr_sects, gfp_t gfp_mask, int type, struct bio **biop);
 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
                sector_t nr_sects, gfp_t gfp_mask, struct page *page);
 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,