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| author | Mike Snitzer <snitzer@redhat.com> | 2018-09-25 20:56:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-13 09:11:32 +0200 |
| commit | dce708809daaced8d63eda3447b59951186f3f1a (patch) | |
| tree | 853c80f10612003b7669a96fcaab48295c263d09 | |
| parent | 1516d9fa636f1e6276bf37086d06f9847c25bc59 (diff) | |
| download | linux-stable-dce708809daaced8d63eda3447b59951186f3f1a.tar.gz linux-stable-dce708809daaced8d63eda3447b59951186f3f1a.tar.bz2 linux-stable-dce708809daaced8d63eda3447b59951186f3f1a.zip | |
dm cache: fix resize crash if user doesn't reload cache table
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>
| -rw-r--r-- | drivers/md/dm-cache-target.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index b59615ddf6ba..531d6f3a786e 100644 --- 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(struct cache *cache) 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. |