On Mon, Jun 26, 2017 at 08:09:57PM +0800, Ming Lei wrote: > 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. > Looks good to me. Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx> -liubo > 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> > 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 06dea7c89bbd..4ab02b34f029 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 >
