nfsd: when updating an entry with RC_NOCACHE, just free it

There's no need to keep entries around that we're declaring RC_NOCACHE.
Ditto if there's a problem with the entry.

With this change too, there's no need to test for RC_UNUSED in the
search function. If the entry's in the hash table then it's either
INPROG or DONE.

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

1 files changed, 14 insertions, 4 deletions

diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 69d29d4ea579..e8ea785e295d 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -98,6 +98,14 @@ nfsd_reply_cache_free_locked(struct svc_cacherep *rp)
         kmem_cache_free(drc_slab, rp);
 }
 
+static void
+nfsd_reply_cache_free(struct svc_cacherep *rp)
+{
+        spin_lock(&cache_lock);
+        nfsd_reply_cache_free_locked(rp);
+        spin_unlock(&cache_lock);
+}
+
 int nfsd_reply_cache_init(void)
 {
         drc_slab = kmem_cache_create("nfsd_drc", sizeof(struct svc_cacherep),
@@ -182,8 +190,7 @@ nfsd_cache_search(struct svc_rqst *rqstp)
 
         rh = &cache_hash[request_hash(xid)];
         hlist_for_each_entry(rp, hn, rh, c_hash) {
-                if (rp->c_state != RC_UNUSED &&
-                    xid == rp->c_xid && proc == rp->c_proc &&
+                if (xid == rp->c_xid && proc == rp->c_proc &&
                     proto == rp->c_prot && vers == rp->c_vers &&
                     !nfsd_cache_entry_expired(rp) &&
                     rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) &&
@@ -353,7 +360,7 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
 
         /* Don't cache excessive amounts of data and XDR failures */
         if (!statp || len > (256 >> 2)) {
-                rp->c_state = RC_UNUSED;
+                nfsd_reply_cache_free(rp);
                 return;
         }
 
@@ -367,12 +374,15 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
                 cachv = &rp->c_replvec;
                 cachv->iov_base = kmalloc(len << 2, GFP_KERNEL);
                 if (!cachv->iov_base) {
-                        rp->c_state = RC_UNUSED;
+                        nfsd_reply_cache_free(rp);
                         return;
                 }
                 cachv->iov_len = len << 2;
                 memcpy(cachv->iov_base, statp, len << 2);
                 break;
+        case RC_NOCACHE:
+                nfsd_reply_cache_free(rp);
+                return;
         }
         spin_lock(&cache_lock);
         lru_put_end(rp);