NFS: Define and create server-level objects

Define and create server-level cache index objects (as managed by nfs_client
structs).

Each server object is created in the NFS top-level index object and is itself
an index into which superblock-level objects are inserted.

Ideally there would be one superblock-level object per server, and the former
would be folded into the latter; however, since the "nosharecache" option
exists this isn't possible.

The server object key is a sequence consisting of:

 (1) NFS version

 (2) Server address family (eg: AF_INET or AF_INET6)

 (3) Server port.

 (4) Server IP address.

The key blob is of variable length, depending on the length of (4).

The server object is given no coherency data to carry in the auxiliary data
permitted by the cache.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
index 6d5bb5c69048..ff14b032459b 100644
--- a/fs/nfs/fscache-index.c
+++ b/fs/nfs/fscache-index.c
@@ -47,3 +47,68 @@ void nfs_fscache_unregister(void)
 {
         fscache_unregister_netfs(&nfs_fscache_netfs);
 }
+
+/*
+ * Layout of the key for an NFS server cache object.
+ */
+struct nfs_server_key {
+        uint16_t        nfsversion;             /* NFS protocol version */
+        uint16_t        family;                 /* address family */
+        uint16_t        port;                   /* IP port */
+        union {
+                struct in_addr  ipv4_addr;      /* IPv4 address */
+                struct in6_addr ipv6_addr;      /* IPv6 address */
+        } addr[0];
+};
+
+/*
+ * Generate a key to describe a server in the main NFS index
+ * - We return the length of the key, or 0 if we can't generate one
+ */
+static uint16_t nfs_server_get_key(const void *cookie_netfs_data,
+                                   void *buffer, uint16_t bufmax)
+{
+        const struct nfs_client *clp = cookie_netfs_data;
+        const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &clp->cl_addr;
+        const struct sockaddr_in *sin = (struct sockaddr_in *) &clp->cl_addr;
+        struct nfs_server_key *key = buffer;
+        uint16_t len = sizeof(struct nfs_server_key);
+
+        key->nfsversion = clp->rpc_ops->version;
+        key->family = clp->cl_addr.ss_family;
+
+        memset(key, 0, len);
+
+        switch (clp->cl_addr.ss_family) {
+        case AF_INET:
+                key->port = sin->sin_port;
+                key->addr[0].ipv4_addr = sin->sin_addr;
+                len += sizeof(key->addr[0].ipv4_addr);
+                break;
+
+        case AF_INET6:
+                key->port = sin6->sin6_port;
+                key->addr[0].ipv6_addr = sin6->sin6_addr;
+                len += sizeof(key->addr[0].ipv6_addr);
+                break;
+
+        default:
+                printk(KERN_WARNING "NFS: Unknown network family '%d'\n",
+                       clp->cl_addr.ss_family);
+                len = 0;
+                break;
+        }
+
+        return len;
+}
+
+/*
+ * Define the server object for FS-Cache.  This is used to describe a server
+ * object to fscache_acquire_cookie().  It is keyed by the NFS protocol and
+ * server address parameters.
+ */
+const struct fscache_cookie_def nfs_fscache_server_index_def = {
+        .name           = "NFS.server",
+        .type           = FSCACHE_COOKIE_TYPE_INDEX,
+        .get_key        = nfs_server_get_key,
+};