[PATCH] kNFSd: IDmap support for the NFSv4 server.

From: NeilBrown <neilb@cse.unsw.edu.au>

Updated version which uses ascii-encoding of messages, from
http://www.citi.umich.edu/u/marius/linux-2.5.70-idmap-server-new.diff as of
October 14, 2003.

fs/nfsd/Makefile

@@ -7,5 +7,5 @@ obj-$(CONFIG_NFSD)	+= nfsd.o
 nfsd-y 			:= nfssvc.o nfsctl.o nfsproc.o nfsfh.o vfs.o \
 			   export.o auth.o lockd.o nfscache.o nfsxdr.o stats.o
 nfsd-$(CONFIG_NFSD_V3)	+= nfs3proc.o nfs3xdr.o
-nfsd-$(CONFIG_NFSD_V4)	+= nfs4proc.o nfs4xdr.o nfs4state.o
+nfsd-$(CONFIG_NFSD_V4)	+= nfs4proc.o nfs4xdr.o nfs4state.o nfs4idmap.o
 nfsd-objs		:= $(nfsd-y)

fs/nfsd/nfs4proc.c

@@ -568,7 +568,8 @@ nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_ver
 
 	status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 				    current_fh->fh_dentry, buf,
-				    &count, verify->ve_bmval);
+				    &count, verify->ve_bmval,
+				    rqstp);
 
 	/* this means that nfsd4_encode_fattr() ran out of space */
 	if (status == nfserr_resource && count == 0)

fs/nfsd/nfs4xdr.c

@@ -51,10 +51,10 @@
 #include <linux/sunrpc/xdr.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/clnt.h>
-#include <linux/sunrpc/name_lookup.h>
 #include <linux/nfsd/nfsd.h>
 #include <linux/nfsd/state.h>
 #include <linux/nfsd/xdr4.h>
+#include <linux/nfsd_idmap.h>
 
 #define NFSDDBG_FACILITY		NFSDDBG_XDR
 
@@ -373,7 +373,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *ia
 		READMEM(buf, dummy32);
 		if (check_utf8(buf, dummy32))
 			return nfserr_inval;
-		if ((status = name_get_uid(buf, dummy32, &iattr->ia_uid)))
+		if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 			goto out_nfserr;
 		iattr->ia_valid |= ATTR_UID;
 	}
@@ -386,7 +386,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *ia
 		READMEM(buf, dummy32);
 		if (check_utf8(buf, dummy32))
 			return nfserr_inval;
-		if ((status = name_get_gid(buf, dummy32, &iattr->ia_gid)))
+		if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 			goto out_nfserr;
 		iattr->ia_valid |= ATTR_GID;
 	}
@@ -1239,13 +1239,16 @@ static u32 nfs4_ftypes[16] = {
  */
 int
 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
-		   struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval)
+		struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
+		struct svc_rqst *rqstp)
 {
 	u32 bmval0 = bmval[0];
 	u32 bmval1 = bmval[1];
 	struct kstat stat;
-	struct name_ent *owner = NULL;
-	struct name_ent *group = NULL;
+	char owner[IDMAP_NAMESZ];
+	u32 ownerlen = 0;
+	char group[IDMAP_NAMESZ];
+	u32 grouplen = 0;
 	struct svc_fh tempfh;
 	struct kstatfs statfs;
 	int buflen = *countp << 2;
@@ -1277,14 +1280,20 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
 		fhp = &tempfh;
 	}
 	if (bmval1 & FATTR4_WORD1_OWNER) {
-		status = name_get_user(stat.uid, &owner);
-		if (status)
+		int temp = nfsd_map_uid_to_name(rqstp, stat.uid, owner);
+		if (temp < 0) {
+			status = temp;
 			goto out_nfserr;
+		}
+		ownerlen = (unsigned) temp;
 	}
 	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
-		status = name_get_group(stat.gid, &group);
-		if (status)
+		int temp = nfsd_map_gid_to_name(rqstp, stat.gid, group);
+		if (temp < 0) {
+			status = temp;
 			goto out_nfserr;
+		}
+		grouplen = (unsigned) temp;
 	}
 
 	if ((buflen -= 16) < 0)
@@ -1485,20 +1494,18 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
 		WRITE32(stat.nlink);
 	}
 	if (bmval1 & FATTR4_WORD1_OWNER) {
-		int namelen  = strlen(owner->name);
-		buflen -= (XDR_QUADLEN(namelen) << 2) + 4;
+		buflen -= (XDR_QUADLEN(ownerlen) << 2) + 4;
 		if (buflen < 0)
 			goto out_resource;
-		WRITE32(namelen);
-		WRITEMEM(owner->name, namelen);
+		WRITE32(ownerlen);
+		WRITEMEM(owner, ownerlen);
 	}
 	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
-		int namelen = strlen(group->name);
-		buflen -= (XDR_QUADLEN(namelen) << 2) + 4;
+		buflen -= (XDR_QUADLEN(grouplen) << 2) + 4;
 		if (buflen < 0)
 			goto out_resource;
-		WRITE32(namelen);
-		WRITEMEM(group->name, namelen);
+		WRITE32(grouplen);
+		WRITEMEM(group, grouplen);
 	}
 	if (bmval1 & FATTR4_WORD1_RAWDEV) {
 		if ((buflen -= 8) < 0)
@@ -1566,10 +1573,6 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
 out:
 	if (fhp == &tempfh)
 		fh_put(&tempfh);
-	if (owner)
-		name_put(owner);
-	if (group)
-		name_put(group);
 	return status;
 out_nfserr:
 	status = nfserrno(status);
@@ -1648,7 +1651,8 @@ nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
 		}
 
 		nfserr = nfsd4_encode_fattr(NULL, exp,
-				dentry, p, &buflen, cd->rd_bmval);
+				dentry, p, &buflen, cd->rd_bmval,
+				cd->rd_rqstp);
 		if (!nfserr) {
 			p += buflen;
 			goto out;
@@ -1771,7 +1775,8 @@ nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_ge
 
 	buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
 	nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
-				    resp->p, &buflen, getattr->ga_bmval);
+				    resp->p, &buflen, getattr->ga_bmval,
+				    resp->rqstp);
 
 	if (!nfserr)
 		resp->p += buflen;
@@ -2381,6 +2386,7 @@ nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoun
 	args->tmpp = NULL;
 	args->to_free = NULL;
 	args->ops = args->iops;
+	args->rqstp = rqstp;
 
 	status = nfsd4_decode_compound(args);
 	if (status) {

fs/nfsd/nfsctl.c

@@ -25,6 +25,7 @@
 #include <linux/init.h>
 
 #include <linux/nfs.h>
+#include <linux/nfsd_idmap.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/nfsd/nfsd.h>
 #include <linux/nfsd/cache.h>
@@ -437,6 +438,9 @@ static int __init init_nfsd(void)
 	nfsd_cache_init();	/* RPC reply cache */
 	nfsd_export_init();	/* Exports table */
 	nfsd_lockd_init();	/* lockd->nfsd callbacks */
+#ifdef CONFIG_NFSD_V4
+	nfsd_idmap_init();      /* Name to ID mapping */
+#endif /* CONFIG_NFSD_V4 */
 	if (proc_mkdir("fs/nfs", 0)) {
 		struct proc_dir_entry *entry;
 		entry = create_proc_entry("fs/nfs/exports", 0, NULL);
@@ -463,6 +467,9 @@ static void __exit exit_nfsd(void)
 	remove_proc_entry("fs/nfs", NULL);
 	nfsd_stat_shutdown();
 	nfsd_lockd_shutdown();
+#ifdef CONFIG_NFSD_V4
+	nfsd_idmap_shutdown();
+#endif /* CONFIG_NFSD_V4 */
 	unregister_filesystem(&nfsd_fs_type);
 }
 

fs/nfsd/nfsproc.c

@@ -585,6 +585,7 @@ nfserrno (int errno)
 		{ nfserr_dquot, -EDQUOT },
 #endif
 		{ nfserr_stale, -ESTALE },
+		{ nfserr_jukebox, -ETIMEDOUT },
 		{ nfserr_dropit, -EAGAIN },
 		{ nfserr_dropit, -ENOMEM },
 		{ -1, -EIO }

include/linux/nfsd/xdr4.h

@@ -375,7 +375,9 @@ struct nfsd4_compoundargs {
 		struct tmpbuf *next;
 		void *buf;
 	}				*to_free;
-	
+
+	struct svc_rqst			*rqstp;
+
 	u32				taglen;
 	char *				tag;
 	u32				minorversion;
@@ -419,7 +421,7 @@ void nfsd4_encode_operation(struct nfsd4_compoundres *, struct nfsd4_op *);
 void nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op);
 int nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
 		       struct dentry *dentry, u32 *buffer, int *countp, 
-		       u32 *bmval);
+		       u32 *bmval, struct svc_rqst *);
 extern int nfsd4_setclientid(struct svc_rqst *rqstp, 
 		struct nfsd4_setclientid *setclid);
 extern int nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 

include/linux/nfsd_idmap.h

+/*
+ *  include/linux/nfsd_idmap.h
+ *
+ *  Mapping of UID to name and vice versa.
+ *
+ *  Copyright (c) 2002, 2003 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 LINUX_NFSD_IDMAP_H
+#define LINUX_NFSD_IDMAP_H
+
+#include <linux/in.h>
+#include <linux/sunrpc/svc.h>
+
+/* XXX from linux/nfs_idmap.h */
+#define IDMAP_NAMESZ 128
+
+void nfsd_idmap_init(void);
+void nfsd_idmap_shutdown(void);
+
+int nfsd_map_name_to_uid(struct svc_rqst *, const char *, size_t, __u32 *);
+int nfsd_map_name_to_gid(struct svc_rqst *, const char *, size_t, __u32 *);
+int nfsd_map_uid_to_name(struct svc_rqst *, __u32, char *);
+int nfsd_map_gid_to_name(struct svc_rqst *, __u32, char *);
+
+#endif /* LINUX_NFSD_IDMAP_H */

net/sunrpc/auth_gss/gss_mech_switch.c

@@ -43,7 +43,6 @@
 #include <linux/sunrpc/sched.h>
 #include <linux/sunrpc/gss_api.h>
 #include <linux/sunrpc/clnt.h>
-#include <linux/sunrpc/name_lookup.h>
 
 #ifdef RPC_DEBUG
 # define RPCDBG_FACILITY        RPCDBG_AUTH