---

yaml --- r: 208272 b: refs/heads/master c: 10d1f9e h: refs/heads/master v: v3
git-mirror · Aug 7, 2010 · 52c5b45 · 52c5b45
1 parent 67be290
commit 52c5b45
Show file tree

Hide file tree

Showing 2 changed files with 13 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f10d9f617a65905c556c3b37c9b9646ae7d04ed7
+refs/heads/master: 10d1f9e2ccfff40665a00ea0e0a0d11e54c9cbb1
diff --git a/trunk/block/blk-lib.c b/trunk/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;