dm cache: fix corruption seen when using cache > 2TB

A rounding bug due to compiler generated temporary being 32bit was found
in remap_to_cache().  A localized cast in remap_to_cache() fixes the
corruption but this preferred fix (changing from uint32_t to sector_t)
eliminates potential for future rounding errors elsewhere.

Cc: stable@vger.kernel.org
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index e04c61e0839e..897dc72f07c9 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -248,7 +248,7 @@ struct cache {
         /*
          * Fields for converting from sectors to blocks.
          */
-        uint32_t sectors_per_block;
+        sector_t sectors_per_block;
         int sectors_per_block_shift;
 
         spinlock_t lock;
@@ -3547,11 +3547,11 @@ static void cache_status(struct dm_target *ti, status_type_t type,
 
                 residency = policy_residency(cache->policy);
 
-                DMEMIT("%u %llu/%llu %u %llu/%llu %u %u %u %u %u %u %lu ",
+                DMEMIT("%u %llu/%llu %llu %llu/%llu %u %u %u %u %u %u %lu ",
                        (unsigned)DM_CACHE_METADATA_BLOCK_SIZE,
                        (unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata),
                        (unsigned long long)nr_blocks_metadata,
-                       cache->sectors_per_block,
+                       (unsigned long long)cache->sectors_per_block,
                        (unsigned long long) from_cblock(residency),
                        (unsigned long long) from_cblock(cache->cache_size),
                        (unsigned) atomic_read(&cache->stats.read_hit),