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-rw-r--r--block/blk-lib.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index e16185b0d8e1..5d793e143f3c 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;