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| author | Ming Lei <ming.lei@canonical.com> | 2016-03-12 22:56:19 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-16 08:43:01 -0700 |
| commit | b59ea3efba4889ece81056883193d78b51db11d1 (patch) | |
| tree | f236964982923c5d86afc823c62fb50e6c64d100 /include | |
| parent | a2cee580a541ab6f3ed75fe35b11d8074c2b58a1 (diff) | |
| download | lwn-b59ea3efba4889ece81056883193d78b51db11d1.tar.gz lwn-b59ea3efba4889ece81056883193d78b51db11d1.zip | |
block: don't optimize for non-cloned bio in bio_get_last_bvec()
commit 90d0f0f11588ec692c12f9009089b398be395184 upstream.
For !BIO_CLONED bio, we can use .bi_vcnt safely, but it
doesn't mean we can just simply return .bi_io_vec[.bi_vcnt - 1]
because the start postion may have been moved in the middle of
the bvec, such as splitting in the middle of bvec.
Fixes: 7bcd79ac50d9(block: bio: introduce helpers to get the 1st and last bvec)
Reported-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 79cfaeef1b0d..fbe47bc700bd 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -320,11 +320,6 @@ static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) struct bvec_iter iter = bio->bi_iter; int idx; - if (!bio_flagged(bio, BIO_CLONED)) { - *bv = bio->bi_io_vec[bio->bi_vcnt - 1]; - return; - } - if (unlikely(!bio_multiple_segments(bio))) { *bv = bio_iovec(bio); return; |