Add support for mapping NFSv4 remote user/group names into local

unix-style uid/gids.

Note that this makes use of the RPC client upcall mechanism
(rpc_pipefs) to notify a userland daemon that does the actual mapping.
The results are then cached in the kernel.
The userland daemon can be downloaded from the CITI NFSv4 page at

     http://www.citi.umich.edu/projects/nfsv4/

1 files changed, 69 insertions, 0 deletions

diff --git a/include/linux/nfs_idmap.h b/include/linux/nfs_idmap.h
new file mode 100644
index 000000000000..248adf707071
--- /dev/null
+++ b/include/linux/nfs_idmap.h
@@ -0,0 +1,69 @@
+/*
+ * include/linux/nfs_idmap.h
+ *
+ *  UID and GID to name mapping for clients.
+ *
+ *  Copyright (c) 2002 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Marius Aamodt Eriksen <marius@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef NFS_IDMAP_H
+#define NFS_IDMAP_H
+
+/* XXX from bits/utmp.h  */
+#define IDMAP_NAMESZ  128
+
+#define IDMAP_TYPE_USER  0
+#define IDMAP_TYPE_GROUP 1
+
+#define IDMAP_CONV_IDTONAME 0
+#define IDMAP_CONV_NAMETOID 1
+
+#define IDMAP_STATUS_INVALIDMSG 0x01
+#define IDMAP_STATUS_AGAIN      0x02
+#define IDMAP_STATUS_LOOKUPFAIL 0x04
+#define IDMAP_STATUS_SUCCESS    0x08
+
+struct idmap_msg {
+	u_int8_t  im_type;
+	u_int8_t  im_conv;
+	char      im_name[IDMAP_NAMESZ];
+	u_int32_t im_id;
+	u_int8_t  im_status;
+};
+
+#ifdef __KERNEL__
+void      *nfs_idmap_new(struct nfs_server *);
+void       nfs_idmap_delete(struct nfs_server *);
+int        nfs_idmap_id(struct nfs_server *, u_int8_t, char *, u_int,  uid_t *);
+int        nfs_idmap_name(struct nfs_server *, u_int8_t, uid_t, char *, u_int *);
+#endif /* __KERNEL__ */
+
+#endif /* NFS_IDMAP_H */