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btrfs: avoid accessing bvec table directly for a cloned bio

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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>
This commit is contained in:
Ming Lei 2017-12-18 20:22:12 +08:00 committed by Jens Axboe
parent a0b60d725e
commit c16a8ac3c0
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/inode.c
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@ -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;