[PATCH 4.4 08/27] dm cache: fix resize crash if user doesnt reload cache table

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mike Snitzer <snitzer@redhat.com>

commit 5d07384a666d4b2f781dc056bfeec2c27fbdf383 upstream.

A reload of the cache's DM table is needed during resize because
otherwise a crash will occur when attempting to access smq policy
entries associated with the portion of the cache that was recently
extended.

The reason is cache-size based data structures in the policy will not be
resized, the only way to safely extend the cache is to allow for a
proper cache policy initialization that occurs when the cache table is
loaded.  For example the smq policy's space_init(), init_allocator(),
calc_hotspot_params() must be sized based on the extended cache size.

The fix for this is to disallow cache resizes of this pattern:
1) suspend "cache" target's device
2) resize the fast device used for the cache
3) resume "cache" target's device

Instead, the last step must be a full reload of the cache's DM table.

Fixes: 66a636356 ("dm cache: add stochastic-multi-queue (smq) policy")
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-cache-target.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3391,8 +3391,13 @@ static dm_cblock_t get_cache_dev_size(st
 
 static bool can_resize(struct cache *cache, dm_cblock_t new_size)
 {
-	if (from_cblock(new_size) > from_cblock(cache->cache_size))
-		return true;
+	if (from_cblock(new_size) > from_cblock(cache->cache_size)) {
+		if (cache->sized) {
+			DMERR("%s: unable to extend cache due to missing cache table reload",
+			      cache_device_name(cache));
+			return false;
+		}
+	}
 
 	/*
 	 * We can't drop a dirty block when shrinking the cache.