Patch "dm cache: fix corruption seen when using cache > 2TB" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
dm-cache-fix-corruption-seen-when-using-cache-2tb.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Joe Thornber <[email protected]>
Date: Thu, 9 Feb 2017 11:46:18 -0500
Subject: dm cache: fix corruption seen when using cache > 2TB

From: Joe Thornber <[email protected]>

commit ca763d0a53b264a650342cee206512bc92ac7050 upstream.

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.

---
 drivers/md/dm-cache-target.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -251,7 +251,7 @@ 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_targe
 
 		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),

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/dm-cache-fix-corruption-seen-when-using-cache-2tb.patch