2 * nfsumount.c -- Linux NFS umount
3 * Copyright (C) 2006 Amit Gud <agud@redhat.com>
5 * - Basic code and wrapper around NFS umount code originally
6 * in util-linux/mount/nfsmount.c
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
25 #include <sys/mount.h>
33 #include "mount_constants.h"
38 #if !defined(MNT_FORCE)
39 /* dare not try to include <linux/mount.h> -- lots of errors */
43 #if !defined(MNT_DETACH)
47 extern char *progname;
54 static int del_mtab(const char *spec, const char *node)
60 res = umount2 (node, MNT_DETACH);
67 res = umount2 (node, MNT_FORCE);
72 if (errno == ENOSYS) {
74 printf(_("no umount2, trying umount...\n"));
81 if (res < 0 && remount && errno == EBUSY && spec) {
82 /* Umount failed - let us try a remount */
83 res = mount(spec, node, NULL,
84 MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
87 nfs_error(_("%s: %s busy - remounted read-only"),
89 remnt.mnt_type = remnt.mnt_fsname = NULL;
90 remnt.mnt_dir = xstrdup(node);
91 remnt.mnt_opts = xstrdup("ro");
93 update_mtab(node, &remnt);
95 } else if (errno != EBUSY) { /* hmm ... */
97 nfs_error(_("%s: could not remount %s read-only"),
103 /* Umount succeeded */
105 printf(_("%s umounted\n"), spec ? spec : node);
110 (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
111 update_mtab(node, NULL);
118 umount_error(umnt_err, node);
123 * Pick up certain mount options used during the original mount
124 * from /etc/mtab. The basics include the server's IP address and
125 * the server pathname of the share to unregister.
127 * These options might also describe the mount port, mount protocol
128 * version, and transport protocol used to punch through a firewall.
129 * We will need this information to get through the firewall again
132 static int do_nfs_umount(const char *spec, char *opts)
136 clnt_addr_t mnt_server = { &hostname, };
137 struct mntent mnt = { .mnt_opts = opts };
138 struct pmap *pmap = &mnt_server.pmap;
142 nfs_error(_("%s: No NFS export name was provided"),
147 p = strchr(spec, ':');
149 nfs_error(_("%s: '%s' is not a legal NFS export name"),
153 hostname = xstrndup(spec, p - spec);
154 dirname = xstrdup(p + 1);
155 #ifdef NFS_MOUNT_DEBUG
156 printf(_("host: %s, directory: %s\n"), hostname, dirname);
159 if (opts && (p = strstr(opts, "addr="))) {
165 while (*q && *q != ',') q++;
166 hostname = xstrndup(p,q-p);
169 if (opts && (p = strstr(opts, "mounthost="))) {
175 while (*q && *q != ',') q++;
176 hostname = xstrndup(p,q-p);
179 pmap->pm_prog = MOUNTPROG;
180 pmap->pm_vers = MOUNTVERS_NFSV3;
181 if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
182 pmap->pm_prog = atoi(p+10);
183 if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
184 pmap->pm_port = atoi(p+10);
185 if (opts && hasmntopt(&mnt, "v2"))
186 pmap->pm_vers = nfsvers_to_mnt(2);
187 if (opts && hasmntopt(&mnt, "v3"))
188 pmap->pm_vers = nfsvers_to_mnt(3);
189 if (opts && hasmntopt(&mnt, "v4"))
190 pmap->pm_vers = nfsvers_to_mnt(4);
191 if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
192 pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
193 if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
194 pmap->pm_vers = atoi(p+10);
195 if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
196 pmap->pm_prot = IPPROTO_UDP;
197 if (opts && (hasmntopt(&mnt, "tcp") || hasmntopt(&mnt, "proto=tcp")))
198 pmap->pm_prot = IPPROTO_TCP;
200 if (!nfs_gethostbyname(hostname, &mnt_server.saddr)) {
201 nfs_error(_("%s: '%s' does not contain a recognized hostname"),
206 if (!nfs_call_umount(&mnt_server, &dirname)) {
207 nfs_error(_("%s: Server failed to unmount '%s'"),
215 static struct option umount_longopts[] =
217 { "force", 0, 0, 'f' },
218 { "help", 0, 0, 'h' },
219 { "no-mtab", 0, 0, 'n' },
220 { "verbose", 0, 0, 'v' },
221 { "read-only", 0, 0, 'r' },
225 static void umount_usage(void)
227 printf(_("usage: %s dir [-fvnrlh]\n"), progname);
228 printf(_("options:\n\t-f\t\tforce unmount\n"));
229 printf(_("\t-v\tverbose\n"));
230 printf(_("\t-n\tDo not update /etc/mtab\n"));
231 printf(_("\t-r\tremount\n"));
232 printf(_("\t-l\tlazy unmount\n"));
233 printf(_("\t-h\tprint this help\n\n"));
236 int nfsumount(int argc, char *argv[])
240 struct mntentchn *mc;
252 argv[0] = argv[-1]; /* So that getopt error messages are correct */
253 while ((c = getopt_long (argc, argv, "fvnrlh",
254 umount_longopts, NULL)) != -1) {
278 if (optind != argc) {
283 if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
284 nfs_error(_("%s: %s: not found\n"), progname, spec);
289 mc = getmntdirbackward(spec, NULL);
291 mc = getmntdevbackward(spec, NULL);
293 printf(_("Could not find %s in mtab\n"), spec);
295 if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
296 strcmp(mc->m.mnt_type, "nfs4") != 0) {
297 nfs_error(_("%s: %s on %s is not an NFS filesystem"),
298 progname, mc->m.mnt_fsname, mc->m.mnt_dir);
303 /* only permitted if "user=" or "users" is in mount options */
305 /* umount might call us twice. The second time there will
306 * be no entry in mtab and we should just exit quietly
311 nfs_error(_("%s: You are not permitted to unmount %s"),
315 if (hasmntopt(&mc->m, "users") == NULL) {
316 char *opt = hasmntopt(&mc->m, "user");
324 comma = strchr(opt, ',');
326 len = comma - (opt + 5);
329 pw = getpwuid(getuid());
330 if (pw == NULL || strlen(pw->pw_name) != len
331 || strncmp(pw->pw_name, opt+5, len) != 0)
339 ret = do_nfs_umount(mc->m.mnt_fsname, mc->m.mnt_opts);
341 ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
342 } else if (*spec != '/') {
344 ret = do_nfs_umount(spec, "tcp,v3");
346 ret = del_mtab(NULL, spec);