- Remove UMAP filesystem. It was disconnected from build three years ago,

  and it is seriously broken.

Discussed on:   freebsd-arch@
Approved by:	re (mux)

9 files changed, 1 insertions, 580 deletions

diff --git a/sbin/Makefile b/sbin/Makefile
index 361598a..f510e4d 100644
--- a/sbin/Makefile
+++ b/sbin/Makefile
@@ -59,7 +59,6 @@ SUBDIR=	adjkerntz \
 	mount_ntfs \
 	mount_nullfs \
 	mount_udf \
-	mount_umapfs \
 	mount_unionfs \
 	natd \
 	newfs \
diff --git a/sbin/mount/mount.8 b/sbin/mount/mount.8
index db3e477..440b7e2 100644
--- a/sbin/mount/mount.8
+++ b/sbin/mount/mount.8
@@ -420,7 +420,6 @@ However, for the following file system types:
 .Cm portalfs ,
 .Cm smbfs ,
 .Cm udf ,
-.Cm umapfs ,
 and
 .Cm unionfs ,
 .Nm
@@ -513,7 +512,6 @@ support for a particular file system might be provided either on a static
 .Xr mount_smbfs 8 ,
 .Xr mount_std 8 ,
 .Xr mount_udf 8 ,
-.Xr mount_umapfs 8 ,
 .Xr mount_unionfs 8 ,
 .Xr umount 8
 .Sh CAVEATS
diff --git a/sbin/mount/mount.c b/sbin/mount/mount.c
index 4148163..99cab23 100644
--- a/sbin/mount/mount.c
+++ b/sbin/mount/mount.c
@@ -135,8 +135,7 @@ use_mountprog(const char *vfstype)
 	unsigned int i;
 	const char *fs[] = {
 	"cd9660", "mfs", "msdosfs", "nfs", "nfs4", "ntfs",
-	"nwfs", "nullfs", "portalfs", "smbfs", "udf", "umapfs",
-	"unionfs",
+	"nwfs", "nullfs", "portalfs", "smbfs", "udf", "unionfs",
 	NULL
 	};
 
diff --git a/sbin/mount_umapfs/Makefile b/sbin/mount_umapfs/Makefile
deleted file mode 100644
index 0f5891f..0000000
--- a/sbin/mount_umapfs/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-#	@(#)Makefile	8.3 (Berkeley) 3/27/94
-# $FreeBSD$
-
-PROG=	mount_umapfs
-SRCS=	mount_umapfs.c getmntopts.c
-MAN=	mount_umapfs.8
-
-MOUNT=	${.CURDIR}/../mount
-CFLAGS+=-I${MOUNT}
-WARNS?=	0
-
-.PATH:	${MOUNT}
-
-.include <bsd.prog.mk>
diff --git a/sbin/mount_umapfs/mount_umapfs.8 b/sbin/mount_umapfs/mount_umapfs.8
deleted file mode 100644
index 1bbaadb..0000000
--- a/sbin/mount_umapfs/mount_umapfs.8
+++ /dev/null
@@ -1,146 +0,0 @@
-.\" Copyright (c) 1992, 1993, 1994
-.\"	The Regents of the University of California.  All rights reserved.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software donated to Berkeley by
-.\" Jan-Simon Pendry and from John Heidemann of the UCLA Ficus project.
-.\"
-.\" 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.
-.\" 4. 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 BY THE REGENTS AND CONTRIBUTORS ``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.
-.\"
-.\"	@(#)mount_umap.8	8.4 (Berkeley) 5/1/95
-.\" $FreeBSD$
-.\"
-.Dd May 1, 1995
-.Dt MOUNT_UMAPFS 8
-.Os
-.Sh NAME
-.Nm mount_umapfs
-.Nd sample file system layer
-.Sh SYNOPSIS
-.Nm
-.Op Fl o Ar options
-.Fl u Ar uid-mapfile
-.Fl g Ar gid-mapfile
-.Ar target
-.Ar mount-point
-.Sh DESCRIPTION
-The
-.Nm
-utility is used to mount a sub-tree of an existing file system
-that uses a different set of uids and gids than the local system.
-Such a file system could be mounted from a remote site via NFS or
-it could be a file system on removable media brought from some
-foreign location that uses a different password file.
-.Pp
-The
-.Nm
-utility uses a set of files provided by the user to make correspondences
-between uids and gids in the sub-tree's original environment and
-some other set of ids in the local environment.
-For instance, user
-smith might have uid 1000 in the original environment, while having
-uid 2000 in the local environment.
-The
-.Nm
-utility allows the subtree from smith's original environment to be
-mapped in such a way that all files with owning uid 1000 look like
-they are actually owned by uid 2000.
-.Pp
-The options are as follows:
-.Bl -tag -width indent
-.It Fl o
-Options are specified with a
-.Fl o
-flag followed by a comma separated string of options.
-See the
-.Xr mount 8
-man page for possible options and their meanings.
-.It Ar target
-Should be the current location of the sub-tree in the
-local system's name space.
-.It Ar mount-point
-Should be a directory
-where the mapped subtree is to be placed.
-.It Fl u Ar uid-mapfile
-.It Fl g Ar gid-mapfile
-Describe the mappings to be made between identifiers.
-Briefly, the format of these files is a count of the number of
-mappings on the first line, with each subsequent line containing
-a single mapping.
-Each of these mappings consists of an id in
-the local environment and the corresponding id from the original environment,
-separated by white space.
-.Ar Uid-mapfile
-should contain all uid
-mappings, and
-.Ar gid-mapfile
-should contain all gid mappings.
-Any uids not mapped in
-.Ar uid-mapfile
-will be treated as user NOBODY,
-and any gids not mapped in
-.Ar gid-mapfile
-will be treated as group
-NULLGROUP.
-At most 64 uids can be mapped for a given subtree, and
-at most 16 groups can be mapped by a given subtree.
-.El
-.Pp
-The mapfiles can be located anywhere in the file hierarchy, but they
-must be owned by root, and they must be writable only by root.
-The
-.Nm
-utility will refuse to map the sub-tree if the ownership or permissions on
-these files are improper.
-It will also balk if the count of mappings
-in the first line of the map files is not correct.
-.Pp
-The layer created by the
-.Nm
-utility is meant to serve as a simple example of file system layering.
-It is not meant for production use.
-The implementation is not very
-sophisticated.
-.Sh SEE ALSO
-.Xr mount 8 ,
-.Xr mount_nullfs 8
-.Sh HISTORY
-The
-.Nm
-utility first appeared in
-.Bx 4.4 .
-.Sh BUGS
-THIS FILE SYSTEM TYPE IS NOT YET FULLY SUPPORTED (READ: IT DOESN'T WORK)
-AND USING IT MAY, IN FACT, DESTROY DATA ON YOUR SYSTEM.
-USE AT YOUR
-OWN RISK.
-BEWARE OF DOG.
-SLIPPERY WHEN WET.
-.Pp
-This code also needs an owner in order to be less dangerous - serious
-hackers can apply by sending mail to
-.Aq hackers@FreeBSD.org
-and announcing
-their intent to take it over.
diff --git a/sbin/mount_umapfs/mount_umapfs.c b/sbin/mount_umapfs/mount_umapfs.c
deleted file mode 100644
index b16cf10..0000000
--- a/sbin/mount_umapfs/mount_umapfs.c
+++ /dev/null
@@ -1,235 +0,0 @@
-/*
- * Copyright (c) 1992, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software donated to Berkeley by
- * Jan-Simon Pendry.
- *
- * 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.
- * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``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 lint
-static const char copyright[] =
-"@(#) Copyright (c) 1992, 1993, 1994\n\
-	The Regents of the University of California.  All rights reserved.\n";
-#endif /* not lint */
-
-#ifndef lint
-#if 0
-static char sccsid[] = "@(#)mount_umap.c	8.5 (Berkeley) 4/26/95";
-#endif
-static const char rcsid[] =
-  "$FreeBSD$";
-#endif /* not lint */
-
-#include <sys/param.h>
-#include <sys/mount.h>
-#include <sys/stat.h>
-
-#include <fs/umapfs/umap.h>
-
-#include <err.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sysexits.h>
-#include <unistd.h>
-
-#include "mntopts.h"
-
-#define ROOTUSER 0
-/*
- * This define controls whether any user but the superuser can own and
- * write mapfiles.  If other users can, system security can be gravely
- * compromised.  If this is not a concern, undefine SECURITY.
- */
-#define MAPSECURITY 1
-
-/*
- * This routine provides the user interface to mounting a umap layer.
- * It takes 4 mandatory parameters.  The mandatory arguments are the place
- * where the next lower level is mounted, the place where the umap layer is to
- * be mounted, the name of the user mapfile, and the name of the group
- * mapfile.  The routine checks the ownerships and permissions on the
- * mapfiles, then opens and reads them.  Then it calls mount(), which
- * will, in turn, call the umap version of mount.
- */
-
-static struct mntopt mopts[] = {
-	MOPT_STDOPTS,
-	MOPT_END
-};
-
-static void	usage(void) __dead2;
-
-int
-main(argc, argv)
-	int argc;
-	char *argv[];
-{
-	static char not[] = "; not mounted";
-	struct stat statbuf;
-	struct umap_args args;
-        FILE *fp, *gfp;
-        u_long gmapdata[GMAPFILEENTRIES][2], mapdata[MAPFILEENTRIES][2];
-	int ch, count, gnentries, mntflags, nentries;
-	char *gmapfile, *mapfile, buf[20];
-	char source[MAXPATHLEN], target[MAXPATHLEN];
-
-	mntflags = 0;
-	mapfile = gmapfile = NULL;
-	while ((ch = getopt(argc, argv, "g:o:u:")) != -1)
-		switch (ch) {
-		case 'g':
-			gmapfile = optarg;
-			break;
-		case 'o':
-			getmntopts(optarg, mopts, &mntflags, 0);
-			break;
-		case 'u':
-			mapfile = optarg;
-			break;
-		case '?':
-		default:
-			usage();
-		}
-	argc -= optind;
-	argv += optind;
-
-	if (argc != 2 || mapfile == NULL || gmapfile == NULL)
-		usage();
-
-	/* resolve both target and source with realpath(3) */
-	(void)checkpath(argv[0], source);
-	(void)checkpath(argv[1], target);
-
-	/* Read in uid mapping data. */
-	if ((fp = fopen(mapfile, "r")) == NULL)
-		err(EX_NOINPUT, "%s%s", mapfile, not);
-
-#ifdef MAPSECURITY
-	/*
-	 * Check that group and other don't have write permissions on
-	 * this mapfile, and that the mapfile belongs to root.
-	 */
-	if (fstat(fileno(fp), &statbuf))
-		err(EX_OSERR, "%s%s", mapfile, not);
-	if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
-		strmode(statbuf.st_mode, buf);
-		err(EX_NOPERM, "%s: improper write permissions (%s)%s",
-		    mapfile, buf, not);
-	}
-	if (statbuf.st_uid != ROOTUSER)
-		errx(EX_NOPERM, "%s does not belong to root%s", mapfile, not);
-#endif /* MAPSECURITY */
-
-	if ((fscanf(fp, "%d\n", &nentries)) != 1)
-		errx(EX_DATAERR, "%s: nentries not found%s", mapfile, not);
-	if (nentries > MAPFILEENTRIES)
-		errx(EX_DATAERR,
-		    "maximum number of entries is %d%s", MAPFILEENTRIES, not);
-#if 0
-	(void)printf("reading %d entries\n", nentries);
-#endif
-	for (count = 0; count < nentries; ++count) {
-		if ((fscanf(fp, "%lu %lu\n",
-		    &(mapdata[count][0]), &(mapdata[count][1]))) != 2) {
-			if (ferror(fp))
-				err(EX_OSERR, "%s%s", mapfile, not);
-			if (feof(fp))
-				errx(EX_DATAERR, "%s: unexpected end-of-file%s",
-				    mapfile, not);
-			errx(EX_DATAERR, "%s: illegal format (line %d)%s",
-			    mapfile, count + 2, not);
-		}
-#if 0
-		/* Fix a security hole. */
-		if (mapdata[count][1] == 0)
-			errx(1, "mapping id 0 not permitted (line %d)%s",
-			    count + 2, not);
-#endif
-	}
-
-	/* Read in gid mapping data. */
-	if ((gfp = fopen(gmapfile, "r")) == NULL)
-		err(EX_NOINPUT, "%s%s", gmapfile, not);
-
-#ifdef MAPSECURITY
-	/*
-	 * Check that group and other don't have write permissions on
-	 * this group mapfile, and that the file belongs to root.
-	 */
-	if (fstat(fileno(gfp), &statbuf))
-		err(EX_OSERR, "%s%s", gmapfile, not);
-	if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
-		strmode(statbuf.st_mode, buf);
-		err(EX_NOPERM, "%s: improper write permissions (%s)%s",
-		    gmapfile, buf, not);
-	}
-	if (statbuf.st_uid != ROOTUSER)
-		errx(EX_NOPERM, "%s does not belong to root%s", gmapfile, not);
-#endif /* MAPSECURITY */
-
-	if ((fscanf(gfp, "%d\n", &gnentries)) != 1)
-		errx(EX_DATAERR, "%s: nentries not found%s", gmapfile, not);
-	if (gnentries > MAPFILEENTRIES)
-		errx(EX_DATAERR,
-		    "maximum number of entries is %d%s", GMAPFILEENTRIES, not);
-#if 0
-	(void)printf("reading %d group entries\n", gnentries);
-#endif
-
-	for (count = 0; count < gnentries; ++count)
-		if ((fscanf(gfp, "%lu %lu\n",
-		    &(gmapdata[count][0]), &(gmapdata[count][1]))) != 2) {
-			if (ferror(gfp))
-				err(EX_OSERR, "%s%s", gmapfile, not);
-			if (feof(gfp))
-				errx(EX_DATAERR, "%s: unexpected end-of-file%s",
-				    gmapfile, not);
-			errx(EX_DATAERR, "%s: illegal format (line %d)%s",
-			    gmapfile, count + 2, not);
-		}
-
-
-	/* Setup mount call args. */
-	args.target = source;
-	args.nentries = nentries;
-	args.mapdata = mapdata;
-	args.gnentries = gnentries;
-	args.gmapdata = gmapdata;
-
-	if (mount("umapfs", argv[1], mntflags, &args))
-		err(1, NULL);
-	exit(0);
-}
-
-void
-usage()
-{
-	(void)fprintf(stderr,
-"usage: mount_umapfs [-o options] -u uid-mapfile -g gid-mapfile target mount-point\n");
-	exit(EX_USAGE);
-}
diff --git a/sbin/mount_umapfs/sample.group.mapfile b/sbin/mount_umapfs/sample.group.mapfile
deleted file mode 100644
index 69d3d77..0000000
--- a/sbin/mount_umapfs/sample.group.mapfile
+++ /dev/null
@@ -1,2 +0,0 @@
-1
-1200 1200
diff --git a/sbin/mount_umapfs/sample.user.mapfile b/sbin/mount_umapfs/sample.user.mapfile
deleted file mode 100644
index 03c59e9..0000000
--- a/sbin/mount_umapfs/sample.user.mapfile
+++ /dev/null
@@ -1,3 +0,0 @@
-2
-5217 5217
-3 3
diff --git a/sbin/mount_umapfs/umap_manual b/sbin/mount_umapfs/umap_manual
deleted file mode 100644
index 50a8ce5..0000000
--- a/sbin/mount_umapfs/umap_manual
+++ /dev/null
@@ -1,175 +0,0 @@
-
-\appendix
-\section{The umap Layer} \label{sect:umap}
-
-\subsection{Introduction}
-
-Normally, the file system is expected to span a single administrative domain.
-An administrative domain, for these purposes, is a machine or set of
-machines that share common password file information, usually through
-the yellow pages mechanism.  File hierarchies that span more 
-than one domain leads to certain problems, since the same numerical 
-UID in one domain may correspond to a different user in another domain.  
-If the system administrator is very careful to ensure that both domains 
-contain identical user ID information, the umap layer can be used to
-run between those domains without changes
-
-The umap layer is a file system layer that sits on top of the normal
-file layer.  The umap layer maps Unix-style UIDs from
-one domain into the UIDs in the other domain.  By setting up the mappings
-properly, the same user with different UIDs in two domains can be seen
-as the same user, from the system point of view, or, conversely, two
-different users with the same UID in the two domains can be distinguished.
-
-First, we define some terms.  ``User'' refers to the human (or daemon) that
-has privileges to login, run programs, and access files.  ``UID''refers to
-the numerical identifier that uniquely identifies the user within a
-single domain.  ``Login name'' refers to the character string the user
-types to log into the system.  ``GID'' refers to the numerical group
-identifier used by Unix systems to identify groups of users.  ``Group
-name'' is the character string name attached to a particular GID in the
-local {\sf /etc/groups} file or the yellow pages groups file.
-
-In order for the umap layer to work properly, all users 
-in either domain must have password file entries in both domains.  
-They do not, however, have to have the same numerical UID, nor even the 
-same character string login name (the latter is highly recommended, 
-if possible, however).  Any user not having a UID in one domain will be 
-treated as the special user NOBODY by the other domain, probably with 
-undesirable consequences.  Any user not owning any files in the shared
-sub-trees need not be given a UID in the other domain.
-
-Groups work similarly.  The umap layer can translate group ID's between
-domains in the same manner as UID's.  Again, any group that wishes to
-participate must have a group ID in both domains,
-though it need not be the same GID in both.  If a group in one domain is not
-known in the other domain, that group will be treated as being NULLGROUP.
-The umap layer has no provisions for enrolling UID's from other domains
-as group members, but, since each user from each domain must have some
-UID in every domain, the UID in the local domain can be used to enroll
-the user in the local groups.  
-
-NOBODY and NULLGROUP are special reserved UID's and GID's, respectively.
-NOBODY is user 32767.  NULLGROUP is group 65534.  If the system administrator
-wants to have an appropriate text string appear when these UID's are
-encountered by programs like {\sf ls -l}, he should add these values to
-the password and {\sf /etc/groups} file, or to the appropriate yellow pages.  
-If these IDs are already in use in that domain, different values can be 
-used for NOBODY and NULLGROUP, but that will require a recompilation of 
-the umap layer code and, as a result, the entire kernel.  These 
-values are defined in the {\sf umap\_info.h} file, kept with the rest of the 
-umap source code.
-
-When the umap layer is in use, one of the participating domains is declared 
-to be the master.  All UID and GID information stored for participating files 
-will be stored in vnodes using its mappings, no matter what site the copies of 
-the files are stored at.  The master domain therefore need not run a copy 
-of the umap layer, as it already has all of the correct mappings.  All 
-other domains must run a umap layer on top of any other layers they use.
-
-\subsection{Setting Up a umap Layer}
-
-The system administrator of a system needing to use the umap layer 
-must take several actions.  
-First, he must create files containing the necessary UID
-and GID mappings.  There is a separate file for user and group IDs.  The
-format of the files is the same.  The first line contains the total number
-of entries in the file.  Each subsequent line contains one mapping.  A
-mapping line consists of two numerical UIDs, separated by white space.
-The first is the UID of a user on the local machine.  The second is the
-UID for the same user on the master machine.  The maximum number of users
-that can be mapped for a single shared sub-tree is 64.  The maximum number of
-groups that can be mapped for a single sub-tree is 16.  These constants
-are set in the {\sf umap\_info.h} file, and can be changed, but changing them
-requires recompilation.  Separate mapping files can be used for each shared 
-subtree, or the same mapping files can be shared by several sub-trees.
-
-Below is a sample UID mapping file.  There are four entries.  UID 5 is mapped
-to 5, 521 to 521, and 7000 to 7000.  UID 2002 is mapped to 604.  On this
-machine, the UID's for users 5, 521, and 7000 are the same as on the master,
-but UID 2002 is for a user whose UID on the master machine is 604.  All
-files in the sub-tree belonging to that user have UID 604 in their inodes,
-even on this machine, but the umap layer will ensure that anyone running
-under UID 2002 will have all files in this sub-tree owned by 604 treated as if 
-they were owned by 2002.  An {\sf ls -l} on a file owned by 604 in this sub-tree
-will show the login name associated with UID 2002 as the owner.
-
-\noindent4\newline
-5 5\newline
-521 521\newline
-2002 604\newline
-7000 7000\newline
-
-The user and group mapping files should be owned by the root user, and
-should be writable only by that user.  If they are not owned by root, or
-are writable by some other user, the umap mounting command will abort.
-
-Normally, the sub-tree is grafted directly into the place in
-the file hierarchy where the it should appear to users. Using the umap
-layer requires that the sub-tree be grafted somewhere else, and
-the umap layer be mounted in the desired position in the file hierarchy.
-Depending on the situation, the underlying sub-tree can be wherever is
-convenient.
-
-\subsection{Troubleshooting umap Layer Problems}
-
-The umap layer code was not built with special convenience or
-robustness in mind, as it is expected to be superseded with a better
-user ID mapping strategy in the near future.  As a result, it is not
-very forgiving of errors in being set up.  Here are some possible
-problems, and what to do about them.
-
-\begin{itemize}
-
-
-\item{Problem: A file belongs to NOBODY, or group NULLGROUP.
-
-Fixes: The mapping files don't know about this file's real user or group.  
-Either they are not in the mapping files, or the counts on the number of 
-entries in the mapping files are too low, so entries at the end (including 
-these) are being ignored.  Add the entries or fix the counts, and either
-unmount and remount the sub-tree, or reboot.}
-
-\item{Problem: A normal operation does not work.
-
-Fixes: Possibly, some mapping has not been set properly.  Check to
-see which files are used by the operation and who they appear to be
-owned by.  If they are owned by NOBODY or some other suspicious user,
-there may be a problem in the mapping files.  Be sure to check groups,
-too.  As above, if the counts of mappings in the mapping files are lower 
-than the actual numbers of pairs, pairs at the end of the file will be 
-ignored.  If any changes are made in the mapping files, you will need to 
-either unmount and remount or reboot before they will take effect.
-
-Another possible problem can arise because not all Unix utilities
-rely exclusively on numeric UID for identification.  For instance, 
-SCCS saves the login name in files.  If a user's login name on two machines
-isn't the same, SCCS may veto an operation even though Unix file permissions,
-as checked by the umap layer, may say it's OK.  There's not much to be
-done in such cases, unless the login name can be changed or one fiddles
-improperly with SCCS information.  There may be other, undiscovered cases
-where similar problems arise, some of which may be even harder to handle.}
-
-\item{Problem: Someone has access permissions he should not have.
-
-Fixes: This is probably caused by a mistake in the mapping files.  Check 
-both user and group mapping files.  If any changes are made in the mapping 
-files, you will need to unmount and remount the sub-tree or reboot before they 
-will take effect.}
-
-\item{Problem: {\sf ls -l} (or a similar program) shows the wrong user for a file.
-
-Fixes: Probably a mistake in the mapping files.  In particular, if
-two local UIDs are mapped to a single master UID, stat calls will assign
-ownership to the first local UID occurring in the file, which may or may
-not be what was intended.  (Generally speaking, mapping two local UIDs to
-a single master UID is a bad idea, but the software will not prevent it.
-Similarly, mapping a single local UID to two master UIDs is a bad idea,
-but will not be prevented.  In this case, only the first mapping of the
-local UID will be done.  The second, and all subsequent ones, will be 
-ignored.) If any changes are made in the mapping files, you will need to 
-unmount and remount the sub-tree or reboot before they will take effect.}
-
-\end{itemize}
-
-\end{document}