blkdev: fix blkdev_issue_zeroout return value

- If function called without barrier option retvalue is incorrect

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 5d793e1..c1fc55a 100644 (file)
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -145,7 +145,7 @@ static void bio_batch_end_io(struct bio *bio, int err)
 int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
                        sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
 {
-       int ret = 0;
+       int ret;
        struct bio *bio;
        struct bio_batch bb;
        unsigned int sz, issued = 0;
@@ -163,11 +163,14 @@ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
                        return ret;
        }
 submit:
+       ret = 0;
        while (nr_sects != 0) {
                bio = bio_alloc(gfp_mask,
                                min(nr_sects, (sector_t)BIO_MAX_PAGES));
-               if (!bio)
+               if (!bio) {
+                       ret = -ENOMEM;
                        break;
+               }
 
                bio->bi_sector = sector;
                bio->bi_bdev   = bdev;
@@ -186,6 +189,7 @@ submit:
                        if (ret < (sz << 9))
                                break;
                }
+               ret = 0;
                issued++;
                submit_bio(WRITE, bio);
        }