nfsd: track the number of DRC entries in the cache

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 9d80dfa7778e..c0c58471eb45 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -27,6 +27,7 @@ static struct hlist_head *	cache_hash;
 static struct list_head         lru_head;
 static int                      cache_disabled = 1;
 static struct kmem_cache        *drc_slab;
+static unsigned int             num_drc_entries;
 
 /*
  * Calculate the hash index from an XID.
@@ -68,6 +69,7 @@ nfsd_reply_cache_free_locked(struct svc_cacherep *rp)
         if (rp->c_type == RC_REPLBUFF)
                 kfree(rp->c_replvec.iov_base);
         list_del(&rp->c_lru);
+        --num_drc_entries;
         kmem_cache_free(drc_slab, rp);
 }
 
@@ -83,10 +85,12 @@ int nfsd_reply_cache_init(void)
 
         INIT_LIST_HEAD(&lru_head);
         i = CACHESIZE;
+        num_drc_entries = 0;
         while (i) {
                 rp = nfsd_reply_cache_alloc();
                 if (!rp)
                         goto out_nomem;
+                ++num_drc_entries;
                 list_add(&rp->c_lru, &lru_head);
                 i--;
         }