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| author | Joe Thornber <ejt@redhat.com> | 2017-02-09 11:46:18 -0500 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-02-16 12:57:10 -0500 |
| commit | ca763d0a53b264a650342cee206512bc92ac7050 (patch) | |
| tree | 7582bbeb5ea5e125756f3cbc1269501620cf4ba5 /drivers/md | |
| parent | 105db5991240cb2675f193589130ef0c8a4f70fe (diff) | |
| download | linux-exynos-ca763d0a53b264a650342cee206512bc92ac7050.tar.gz linux-exynos-ca763d0a53b264a650342cee206512bc92ac7050.tar.bz2 linux-exynos-ca763d0a53b264a650342cee206512bc92ac7050.zip | |
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>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-cache-target.c | 6 |
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), |