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    Subject[2.6.20.16 review 15/28] dm crypt: disable barriers
    Disable barriers in dm-crypt because of current workqueue processing can
    reorder requests.

    This must be addresed later but for now disabling barriers is needed to
    prevent data corruption.

    Signed-off-by: Milan Broz <mbroz@redhat.com>
    Signed-off-by: Alasdair G Kergon <agk@redhat.com>
    Cc: Jens Axboe <jens.axboe@oracle.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    drivers/md/dm-crypt.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
    index 4c2471e..f68677d 100644
    --- a/drivers/md/dm-crypt.c
    +++ b/drivers/md/dm-crypt.c
    @@ -954,6 +954,9 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
    struct crypt_config *cc = ti->private;
    struct crypt_io *io;

    + if (bio_barrier(bio))
    + return -EOPNOTSUPP;
    +
    io = mempool_alloc(cc->io_pool, GFP_NOIO);
    io->target = ti;
    io->base_bio = bio;
    --
    1.5.2.4
    --
    -
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