FS-Cache: Add counters for entry/exit to/from cache operation functions

Count entries to and exits from cache operation table functions.  Maintain
these as a single counter that's added to or removed from as appropriate.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
index 724384ef96d..6a3c48abd67 100644
--- a/fs/fscache/cache.c
+++ b/fs/fscache/cache.c
@@ -381,11 +381,15 @@ void fscache_withdraw_cache(struct fscache_cache *cache)
 
         /* make sure all pages pinned by operations on behalf of the netfs are
          * written to disk */
+        fscache_stat(&fscache_n_cop_sync_cache);
         cache->ops->sync_cache(cache);
+        fscache_stat_d(&fscache_n_cop_sync_cache);
 
         /* dissociate all the netfs pages backed by this cache from the block
          * mappings in the cache */
+        fscache_stat(&fscache_n_cop_dissociate_pages);
         cache->ops->dissociate_pages(cache);
+        fscache_stat_d(&fscache_n_cop_dissociate_pages);
 
         /* we now have to destroy all the active objects pertaining to this
          * cache - which we do by passing them off to thread pool to be