block: don't optimize for non-cloned bio in bio_get_last_bvec()

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commit 90d0f0f115 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>

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Ming Lei 2016-03-12 22:56:19 +08:00 • committed by Greg Kroah-Hartman

parent a2cee580a5

commit b59ea3efba

1 changed files with 0 additions and 5 deletions

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include/linux/bio.h

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