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;
55 static int try_remount(const char *spec, const char *node)
59 res = mount(spec, node, NULL,
60 MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
63 nfs_error(_("%s: %s busy - remounted read-only"),
65 remnt.mnt_type = remnt.mnt_fsname = NULL;
66 remnt.mnt_dir = xstrdup(node);
67 remnt.mnt_opts = xstrdup("ro");
69 update_mtab(node, &remnt);
70 } else if (errno != EBUSY) { /* hmm ... */
72 nfs_error(_("%s: could not remount %s read-only"),
78 static int del_mtab(const char *spec, const char *node)
84 res = umount2 (node, MNT_DETACH);
91 res = umount2 (node, MNT_FORCE);
96 if (errno == ENOSYS) {
98 printf(_("no umount2, trying umount...\n"));
106 if (remount && errno == EBUSY && spec) {
107 res = try_remount(spec, node);
116 /* Umount succeeded */
118 printf(_("%s umounted\n"), spec ? spec : node);
123 (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
124 update_mtab(node, NULL);
131 umount_error(umnt_err, node);
136 * Pick up certain mount options used during the original mount
137 * from /etc/mtab. The basics include the server's IP address and
138 * the server pathname of the share to unregister.
140 * These options might also describe the mount port, mount protocol
141 * version, and transport protocol used to punch through a firewall.
142 * We will need this information to get through the firewall again
145 static int do_nfs_umount23(const char *spec, char *opts)
149 clnt_addr_t mnt_server = { &hostname, };
150 struct mntent mnt = { .mnt_opts = opts };
151 struct pmap *pmap = &mnt_server.pmap;
155 nfs_error(_("%s: No NFS export name was provided"),
160 p = strchr(spec, ':');
162 nfs_error(_("%s: '%s' is not a legal NFS export name"),
166 hostname = xstrndup(spec, p - spec);
167 dirname = xstrdup(p + 1);
168 #ifdef NFS_MOUNT_DEBUG
169 printf(_("host: %s, directory: %s\n"), hostname, dirname);
172 if (opts && (p = strstr(opts, "addr="))) {
178 while (*q && *q != ',') q++;
179 hostname = xstrndup(p,q-p);
182 if (opts && (p = strstr(opts, "mounthost="))) {
188 while (*q && *q != ',') q++;
189 hostname = xstrndup(p,q-p);
192 pmap->pm_prog = MOUNTPROG;
193 pmap->pm_vers = 0; /* unknown */
194 if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
195 pmap->pm_prog = atoi(p+10);
196 if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
197 pmap->pm_port = atoi(p+10);
198 if (opts && hasmntopt(&mnt, "v2"))
199 pmap->pm_vers = nfsvers_to_mnt(2);
200 if (opts && hasmntopt(&mnt, "v3"))
201 pmap->pm_vers = nfsvers_to_mnt(3);
202 if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
203 pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
204 if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
205 pmap->pm_vers = atoi(p+10);
206 if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
207 pmap->pm_prot = IPPROTO_UDP;
208 if (opts && (hasmntopt(&mnt, "tcp") || hasmntopt(&mnt, "proto=tcp")))
209 pmap->pm_prot = IPPROTO_TCP;
211 if (!nfs_gethostbyname(hostname, &mnt_server.saddr)) {
212 nfs_error(_("%s: '%s' does not contain a recognized hostname"),
217 if (!nfs_call_umount(&mnt_server, &dirname)) {
218 nfs_error(_("%s: Server failed to unmount '%s'"),
226 static struct option umount_longopts[] =
228 { "force", 0, 0, 'f' },
229 { "help", 0, 0, 'h' },
230 { "no-mtab", 0, 0, 'n' },
231 { "verbose", 0, 0, 'v' },
232 { "read-only", 0, 0, 'r' },
236 static void umount_usage(void)
238 printf(_("usage: %s dir [-fvnrlh]\n"), progname);
239 printf(_("options:\n\t-f\t\tforce unmount\n"));
240 printf(_("\t-v\tverbose\n"));
241 printf(_("\t-n\tDo not update /etc/mtab\n"));
242 printf(_("\t-r\tremount\n"));
243 printf(_("\t-l\tlazy unmount\n"));
244 printf(_("\t-h\tprint this help\n\n"));
247 int nfsumount(int argc, char *argv[])
251 struct mntentchn *mc;
263 argv[0] = argv[-1]; /* So that getopt error messages are correct */
264 while ((c = getopt_long (argc, argv, "fvnrlh",
265 umount_longopts, NULL)) != -1) {
289 if (optind != argc) {
294 if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
295 nfs_error(_("%s: %s: not found\n"), progname, spec);
300 mc = getmntdirbackward(spec, NULL);
302 mc = getmntdevbackward(spec, NULL);
304 printf(_("Could not find %s in mtab\n"), spec);
306 if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
307 strcmp(mc->m.mnt_type, "nfs4") != 0) {
308 nfs_error(_("%s: %s on %s is not an NFS filesystem"),
309 progname, mc->m.mnt_fsname, mc->m.mnt_dir);
314 /* only permitted if "user=" or "users" is in mount options */
316 /* umount might call us twice. The second time there will
317 * be no entry in mtab and we should just exit quietly
322 nfs_error(_("%s: You are not permitted to unmount %s"),
326 if (hasmntopt(&mc->m, "users") == NULL) {
327 char *opt = hasmntopt(&mc->m, "user");
335 comma = strchr(opt, ',');
337 len = comma - (opt + 5);
340 pw = getpwuid(getuid());
341 if (pw == NULL || strlen(pw->pw_name) != len
342 || strncmp(pw->pw_name, opt+5, len) != 0)
349 if (!lazy && strcmp(mc->m.mnt_type, "nfs4") != 0)
350 ret = do_nfs_umount23(mc->m.mnt_fsname, mc->m.mnt_opts);
351 ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir) ?: ret;
352 } else if (*spec != '/') {
354 ret = do_nfs_umount23(spec, "tcp,v3");
356 ret = del_mtab(NULL, spec);