Sorry, this patch is totally wrong. Let me dig out more.

On 04/10, Jaegeuk Kim wrote:

From: Jaegeuk Kim jaegeuk@google.com

When f->roots is 2 and block size is 4096, it will gives unaligned block size length in the scsi command like below. Let's allocate dm_bufio to set the block size length to match IO chunk size.

E sd 0 : 0:0:0: [sda] tag#30 request not aligned to the logical block size E blk_update_request: I/O error, dev sda, sector 10368424 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 E device-mapper: verity-fec: 254:8: FEC 9244672: parity read failed (block 18056): -5

Fixes: ce1cca17381f ("dm verity: fix FEC for RS roots unaligned to block size") Cc: stable@vger.kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@google.com

---

drivers/md/dm-verity-fec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c index 66f4c6398f67..656238131dd7 100644 --- a/drivers/md/dm-verity-fec.c +++ b/drivers/md/dm-verity-fec.c @@ -743,7 +743,7 @@ int verity_fec_ctr(struct dm_verity *v) } f->bufio = dm_bufio_client_create(f->dev->bdev,

• 			  f->roots << SECTOR_SHIFT,
  

• 			  1 << v->data_dev_block_bits,
  		  1, 0, NULL, NULL);
  

  if (IS_ERR(f->bufio)) { ti->error = "Cannot initialize FEC bufio client";

-- 2.31.1.295.g9ea45b61b8-goog