[PATCH v3 12/49] btrfs: avoid to access bvec table directly for a cloned bio
From: Ming Lei <hidden>
Date: 2017-08-08 08:45:11
Also in:
linux-btrfs, linux-fsdevel, linux-mm, lkml
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
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 <redacted> Cc: David Sterba <dsterba@suse.com> Cc: linux-btrfs@vger.kernel.org Cc: Liu Bo <redacted> Reviewed-by: Liu Bo <redacted> Acked: David Sterba [off-list ref] Signed-off-by: Ming Lei <redacted> --- 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