nfs41: Backchannel: New find_client_with_session()
Finds the 'struct nfs_client' that matches the server's address, major
version number, and session ID.
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index f731bbe..6b342e8 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -104,6 +104,42 @@
#if defined(CONFIG_NFS_V4_1)
+/*
+ * Returns a pointer to a held 'struct nfs_client' that matches the server's
+ * address, major version number, and session ID. It is the caller's
+ * responsibility to release the returned reference.
+ *
+ * Returns NULL if there are no connections with sessions, or if no session
+ * matches the one of interest.
+ */
+ static struct nfs_client *find_client_with_session(
+ const struct sockaddr *addr, u32 nfsversion,
+ struct nfs4_sessionid *sessionid)
+{
+ struct nfs_client *clp;
+
+ clp = nfs_find_client(addr, 4);
+ if (clp == NULL)
+ return NULL;
+
+ do {
+ struct nfs_client *prev = clp;
+
+ if (clp->cl_session != NULL) {
+ if (memcmp(clp->cl_session->sess_id.data,
+ sessionid->data,
+ NFS4_MAX_SESSIONID_LEN) == 0) {
+ /* Returns a held reference to clp */
+ return clp;
+ }
+ }
+ clp = nfs_find_client_next(prev);
+ nfs_put_client(prev);
+ } while (clp != NULL);
+
+ return NULL;
+}
+
/* FIXME: validate args->cbs_{sequence,slot}id */
/* FIXME: referring calls should be processed */
unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,