From: Milan Broz A ciphertext device is incompatible with WRITE SAME bios so we must disable it for all dm crypt devices. Signed-off-by: Milan Broz Cc: stable@vger.kernel.org Signed-off-by: Alasdair G Kergon --- drivers/md/dm-crypt.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) Index: linux/drivers/md/dm-crypt.c =================================================================== --- linux.orig/drivers/md/dm-crypt.c +++ linux/drivers/md/dm-crypt.c @@ -1844,9 +1844,15 @@ static int crypt_iterate_devices(struct return fn(ti, cc->dev, cc->start, ti->len, data); } +static void crypt_io_hints(struct dm_target *ti, + struct queue_limits *limits) +{ + limits->max_write_same_sectors = 0; +} + static struct target_type crypt_target = { .name = "crypt", - .version = {1, 11, 0}, + .version = {1, 12, 0}, .module = THIS_MODULE, .ctr = crypt_ctr, .dtr = crypt_dtr, @@ -1858,6 +1864,7 @@ static struct target_type crypt_target = .message = crypt_message, .merge = crypt_merge, .iterate_devices = crypt_iterate_devices, + .io_hints = crypt_io_hints, }; static int __init dm_crypt_init(void)