nfsd: break out hashtable search into separate function

Later, we'll need more than one call site for this, so break it out
into a new function.

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 634b856..b89e7c8 100644 (file)
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -150,6 +150,35 @@ nfsd_cache_entry_expired(struct svc_cacherep *rp)
 }
 
 /*
+ * Search the request hash for an entry that matches the given rqstp.
+ * Must be called with cache_lock held. Returns the found entry or
+ * NULL on failure.
+ */
+static struct svc_cacherep *
+nfsd_cache_search(struct svc_rqst *rqstp)
+{
+       struct svc_cacherep     *rp;
+       struct hlist_node       *hn;
+       struct hlist_head       *rh;
+       __be32                  xid = rqstp->rq_xid;
+       u32                     proto =  rqstp->rq_prot,
+                               vers = rqstp->rq_vers,
+                               proc = rqstp->rq_proc;
+
+       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 &&
+                   proto == rp->c_prot && vers == rp->c_vers &&
+                   !nfsd_cache_entry_expired(rp) &&
+                   rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) &&
+                   rpc_get_port(svc_addr(rqstp)) == rpc_get_port((struct sockaddr *)&rp->c_addr))
+                       return rp;
+       }
+       return NULL;
+}
+
+/*
  * Try to find an entry matching the current call in the cache. When none
  * is found, we grab the oldest unlocked entry off the LRU list.
  * Note that no operation within the loop may sleep.
@@ -157,8 +186,6 @@ nfsd_cache_entry_expired(struct svc_cacherep *rp)
 int
 nfsd_cache_lookup(struct svc_rqst *rqstp)
 {
-       struct hlist_node       *hn;
-       struct hlist_head       *rh;
        struct svc_cacherep     *rp;
        __be32                  xid = rqstp->rq_xid;
        u32                     proto =  rqstp->rq_prot,
@@ -177,17 +204,10 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
        spin_lock(&cache_lock);
        rtn = RC_DOIT;
 
-       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 &&
-                   proto == rp->c_prot && vers == rp->c_vers &&
-                   !nfsd_cache_entry_expired(rp) &&
-                   rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) &&
-                   rpc_get_port(svc_addr(rqstp)) == rpc_get_port((struct sockaddr *)&rp->c_addr)) {
-                       nfsdstats.rchits++;
-                       goto found_entry;
-               }
+       rp = nfsd_cache_search(rqstp);
+       if (rp) {
+               nfsdstats.rchits++;
+               goto found_entry;
        }
        nfsdstats.rcmisses++;