block: Add bio_end_sector()

Just a little convenience macro - main reason to add it now is preparing
for immutable bio vecs, it'll reduce the size of the patch that puts
bi_sector/bi_size/bi_idx into a struct bvec_iter.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: Lars Ellenberg <drbd-dev@lists.linbit.com>
CC: Jiri Kosina <jkosina@suse.cz>
CC: Alasdair Kergon <agk@redhat.com>
CC: dm-devel@redhat.com
CC: Neil Brown <neilb@suse.de>
CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
CC: Heiko Carstens <heiko.carstens@de.ibm.com>
CC: linux-s390@vger.kernel.org
CC: Chris Mason <chris.mason@fusionio.com>
CC: Steven Whitehouse <swhiteho@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index b6ad0de07930..12d08b4529e9 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -826,8 +826,7 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio)
         if ((bio->bi_sector & 7) != 0 || (bio->bi_size & 4095) != 0)
                 /* Request is not page-aligned. */
                 goto fail;
-        if (((bio->bi_size >> 9) + bio->bi_sector)
-                        > get_capacity(bio->bi_bdev->bd_disk)) {
+        if (bio_end_sector(bio) > get_capacity(bio->bi_bdev->bd_disk)) {
                 /* Request beyond end of DCSS segment. */
                 goto fail;
         }