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>
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 3fdacaf..7f676bd 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -416,11 +416,13 @@
return ERR_PTR(err);
return rpc_mount;
}
+EXPORT_SYMBOL_GPL(rpc_get_mount);
void rpc_put_mount(void)
{
simple_release_fs(&rpc_mount, &rpc_mount_count);
}
+EXPORT_SYMBOL_GPL(rpc_put_mount);
static int rpc_delete_dentry(struct dentry *dentry)
{
@@ -946,6 +948,7 @@
RPCAUTH_portmap,
RPCAUTH_statd,
RPCAUTH_nfsd4_cb,
+ RPCAUTH_cache,
RPCAUTH_RootEOF
};
@@ -974,6 +977,10 @@
.name = "nfsd4_cb",
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
},
+ [RPCAUTH_cache] = {
+ .name = "cache",
+ .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+ },
};
static int
