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Date: Thu, 01 Jun 2017 16:43:16 +0100 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Joe Thornber" <ejt@...hat.com>, "Mike Snitzer" <snitzer@...hat.com> Subject: [PATCH 3.16 131/212] dm cache: fix corruption seen when using cache > 2TB 3.16.44-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Joe Thornber <ejt@...hat.com> 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. Signed-off-by: Joe Thornber <ejt@...hat.com> Signed-off-by: Mike Snitzer <snitzer@...hat.com> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/md/dm-cache-target.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -210,7 +210,7 @@ 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; @@ -2823,11 +2823,11 @@ 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 >> SECTOR_SHIFT), (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),
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