[PATCH] dm verity: fix unaligned block size

[Jaegeuk Kim]

From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>

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@xxxxxxxxxxxxxxx
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 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