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-rw-r--r--block/blk-barrier.c31
1 files changed, 19 insertions, 12 deletions
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index 30022b4..6593ab3 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -348,6 +348,9 @@ static void blkdev_discard_end_io(struct bio *bio, int err)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
}
+ if (bio->bi_private)
+ complete(bio->bi_private);
+
bio_put(bio);
}
@@ -357,21 +360,20 @@ static void blkdev_discard_end_io(struct bio *bio, int err)
* @sector: start sector
* @nr_sects: number of sectors to discard
* @gfp_mask: memory allocation flags (for bio_alloc)
+ * @flags: DISCARD_FL_* flags to control behaviour
*
* Description:
- * Issue a discard request for the sectors in question. Does not wait.
+ * 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)
+int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
+ sector_t nr_sects, gfp_t gfp_mask, int flags)
{
- struct request_queue *q;
- struct bio *bio;
+ DECLARE_COMPLETION_ONSTACK(wait);
+ struct request_queue *q = bdev_get_queue(bdev);
+ int type = flags & DISCARD_FL_BARRIER ?
+ DISCARD_BARRIER : DISCARD_NOBARRIER;
int ret = 0;
- if (bdev->bd_disk == NULL)
- return -ENXIO;
-
- q = bdev_get_queue(bdev);
if (!q)
return -ENXIO;
@@ -379,12 +381,14 @@ int blkdev_issue_discard(struct block_device *bdev,
return -EOPNOTSUPP;
while (nr_sects && !ret) {
- bio = bio_alloc(gfp_mask, 0);
+ struct bio *bio = bio_alloc(gfp_mask, 0);
if (!bio)
return -ENOMEM;
bio->bi_end_io = blkdev_discard_end_io;
bio->bi_bdev = bdev;
+ if (flags & DISCARD_FL_WAIT)
+ bio->bi_private = &wait;
bio->bi_sector = sector;
@@ -396,10 +400,13 @@ int blkdev_issue_discard(struct block_device *bdev,
bio->bi_size = nr_sects << 9;
nr_sects = 0;
}
+
bio_get(bio);
- submit_bio(DISCARD_BARRIER, bio);
+ submit_bio(type, bio);
+
+ if (flags & DISCARD_FL_WAIT)
+ wait_for_completion(&wait);
- /* Check if it failed immediately */
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
else if (!bio_flagged(bio, BIO_UPTODATE))