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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>
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1 changed files with 3 additions and 1 deletions
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@ -8015,6 +8015,7 @@ static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
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int segs;
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int ret;
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blk_status_t status;
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struct bio_vec bvec;
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BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
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@ -8030,8 +8031,9 @@ static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
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}
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segs = bio_segments(failed_bio);
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bio_get_first_bvec(failed_bio, &bvec);
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if (segs > 1 ||
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(failed_bio->bi_io_vec->bv_len > btrfs_inode_sectorsize(inode)))
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(bvec.bv_len > btrfs_inode_sectorsize(inode)))
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read_mode |= REQ_FAILFAST_DEV;
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isector = start - btrfs_io_bio(failed_bio)->logical;
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