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[dm-devel] [PATCH] disable barriers in dm-crypt [was Re: BUG: Files corrupt after moving LVM volume to USB disk]

> Summary of what I've managed to rule out so far:
>1. this problem does not occur without dm-crypt

Please could you test attached patch ?
Sorry for another annoying reboot :-)

mbroz redhat com

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>

Index: linux-
--- linux-	2007-03-23 15:07:11.000000000 +0100
+++ linux-	2007-03-23 15:09:59.000000000 +0100
@@ -925,6 +925,9 @@ 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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