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authorTrond Myklebust <Trond.Myklebust@netapp.com>2009-08-20 02:12:27 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-08-20 02:22:15 +0400
commite571cbf1a4f8d8b6cfd4898df718dae84c75a8e1 (patch)
tree0fc9da9692a1e63cff03053fc87cc807fab5e266 /fs/nfs/cache_lib.h
parent96c61cbd0f30496bfa57ed80f7131a57aea3e4de (diff)
downloadlinux-e571cbf1a4f8d8b6cfd4898df718dae84c75a8e1.tar.xz
NFS: Add a dns resolver for use with NFSv4 referrals and migration
The NFSv4 and NFSv4.1 protocols both allow for the redirection of a client from one server to another in order to support filesystem migration and replication. For full protocol support, we need to add the ability to convert a DNS host name into an IP address that we can feed to the RPC client. We'll reuse the sunrpc cache, now that it has been converted to work with rpc_pipefs. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/cache_lib.h')
-rw-r--r--fs/nfs/cache_lib.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/nfs/cache_lib.h b/fs/nfs/cache_lib.h
new file mode 100644
index 000000000000..76f856e284e4
--- /dev/null
+++ b/fs/nfs/cache_lib.h
@@ -0,0 +1,27 @@
+/*
+ * Helper routines for the NFS client caches
+ *
+ * Copyright (c) 2009 Trond Myklebust <Trond.Myklebust@netapp.com>
+ */
+
+#include <linux/completion.h>
+#include <linux/sunrpc/cache.h>
+#include <asm/atomic.h>
+
+/*
+ * Deferred request handling
+ */
+struct nfs_cache_defer_req {
+ struct cache_req req;
+ struct cache_deferred_req deferred_req;
+ struct completion completion;
+ atomic_t count;
+};
+
+extern int nfs_cache_upcall(struct cache_detail *cd, char *entry_name);
+extern struct nfs_cache_defer_req *nfs_cache_defer_req_alloc(void);
+extern void nfs_cache_defer_req_put(struct nfs_cache_defer_req *dreq);
+extern int nfs_cache_wait_for_upcall(struct nfs_cache_defer_req *dreq);
+
+extern int nfs_cache_register(struct cache_detail *cd);
+extern void nfs_cache_unregister(struct cache_detail *cd);