btrfs: avoid accessing bvec table directly for a cloned bio

Commit 17347cec15f919901c90(Btrfs: change how we iterate bios in endio)
mentioned that for dio the submitted bio may be fast cloned, we
can't access the bvec table directly for a cloned bio, so use
bio_get_first_bvec() to retrieve the 1st bvec.

Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: David Sterba <dsterba@suse.com>
Cc: linux-btrfs@vger.kernel.org
Cc: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Acked: David Sterba <dsterba@suse.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4d5cb6e93c802dd7042e6ec6205abb516bedd392..cb1e2d201434e33c94a648a08670e664f6cca05d 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8015,6 +8015,7 @@ static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
        int segs;
        int ret;
        blk_status_t status;
+       struct bio_vec bvec;
 
        BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
 
@@ -8030,8 +8031,9 @@ static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
        }
 
        segs = bio_segments(failed_bio);
+       bio_get_first_bvec(failed_bio, &bvec);
        if (segs > 1 ||
-           (failed_bio->bi_io_vec->bv_len > btrfs_inode_sectorsize(inode)))
+           (bvec.bv_len > btrfs_inode_sectorsize(inode)))
                read_mode |= REQ_FAILFAST_DEV;
 
        isector = start - btrfs_io_bio(failed_bio)->logical;