diff options
| -rw-r--r-- | block/blk-lib.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index e16185b0d8e..5d793e143f3 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -41,6 +41,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, struct request_queue *q = bdev_get_queue(bdev); int type = flags & BLKDEV_IFL_BARRIER ? DISCARD_BARRIER : DISCARD_NOBARRIER; + unsigned int max_discard_sectors; struct bio *bio; int ret = 0; @@ -50,10 +51,18 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, if (!blk_queue_discard(q)) return -EOPNOTSUPP; - while (nr_sects && !ret) { - unsigned int max_discard_sectors = - min(q->limits.max_discard_sectors, UINT_MAX >> 9); + /* + * Ensure that max_discard_sectors is of the proper + * granularity + */ + max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); + if (q->limits.discard_granularity) { + unsigned int disc_sects = q->limits.discard_granularity >> 9; + max_discard_sectors &= ~(disc_sects - 1); + } + + while (nr_sects && !ret) { bio = bio_alloc(gfp_mask, 1); if (!bio) { ret = -ENOMEM; |