btrfs: fix bio_size_ok() for max_sectors > 0xffff

The data type of max_sectors in queue settings is unsigned int.  But
this value is stored to the local variable whose type is unsigned short
in bio_size_ok().  This can cause unexpected result when max_sectors >
0xffff.

Cc: Chris Mason <chris.mason@fusionio.com>
Cc: linux-btrfs@vger.kernel.org
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 0db6370..92303f4 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5394,7 +5394,7 @@ static int bio_size_ok(struct block_device *bdev, struct bio *bio,
 {
        struct bio_vec *prev;
        struct request_queue *q = bdev_get_queue(bdev);
-       unsigned short max_sectors = queue_max_sectors(q);
+       unsigned int max_sectors = queue_max_sectors(q);
        struct bvec_merge_data bvm = {
                .bi_bdev = bdev,
                .bi_sector = sector,