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@xxxxxx> Cc: Josef Bacik <jbacik@xxxxxx> Cc: David Sterba <dsterba@xxxxxxxx> Cc: linux-btrfs@xxxxxxxxxxxxxxx Cc: Liu Bo <bo.li.liu@xxxxxxxxxx> Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx> Acked: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> --- fs/btrfs/inode.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 95c212037095..5cf320ee7ea0 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7993,6 +7993,7 @@ static int dio_read_error(struct inode *inode, struct bio *failed_bio, int read_mode = 0; int segs; int ret; + struct bio_vec bvec; BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE); @@ -8008,8 +8009,9 @@ static int 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; -- 2.9.4
