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>

diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 9d80dfa7778eb720f4e613aab48deb02d468305b..c0c58471eb45b07fedc7f35a52a29a4a78f195d4 100644 (file)
--- 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--;
        }