]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
block: don't optimize for non-cloned bio in bio_get_last_bvec()
authorMing Lei <ming.lei@canonical.com>
Sat, 12 Mar 2016 14:56:19 +0000 (22:56 +0800)
committerJens Axboe <axboe@fb.com>
Sat, 12 Mar 2016 21:12:10 +0000 (14:12 -0700)
commit90d0f0f11588ec692c12f9009089b398be395184
treea1e3eee514de4fd54349333b004825d4e5cb8add
parentf2c1242194c7af9b26f53359ab2b23df36d3a643
block: don't optimize for non-cloned bio in bio_get_last_bvec()

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)
Cc: stable@vger.kernel.org
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>
include/linux/bio.h