dm log: fix create_log_context to use logical_block_size of log device

create_log_context() must use the logical_block_size from the log disk,
where the I/O happens, not the target's logical_block_size.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 6352a9ad444..9443896ede0 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -412,9 +412,10 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
                 /*
                  * Buffer holds both header and bitset.
                  */
-                buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
-                                       bitset_size,
-                                       ti->limits.logical_block_size);
+                buf_size =
+                    dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size,
+                                bdev_logical_block_size(lc->header_location.
+                                                            bdev));
 
                 if (buf_size > i_size_read(dev->bdev->bd_inode)) {
                         DMWARN("log device %s too small: need %llu bytes",