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    DateMon, 30 Jul 2007 21:32:09 -0700
    FromGreg KH <>
    Subject[patch 09/26] dm crypt: disable barriers
    -stable review patch.  If anyone has any objections, please let us know.
    
    ------------------
    From: Milan Broz <mbroz@redhat.com>
    
    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>
    ---
    Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9c89f8be1a7d14aad9d2c3f7d90d7d88f82c61e2
     drivers/md/dm-crypt.c |    3 +++
     1 file changed, 3 insertions(+)
    --- linux-2.6.21.6.orig/drivers/md/dm-crypt.c
    +++ linux-2.6.21.6/drivers/md/dm-crypt.c
    @@ -954,6 +954,9 @@ static int crypt_map(struct dm_target *t
     	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;
    -- 
    -
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