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"));
105 if (res < 0 && remount && errno == EBUSY && spec) {
106 res = try_remount(spec, node);
112 /* Umount succeeded */
114 printf(_("%s umounted\n"), spec ? spec : node);
119 (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
120 update_mtab(node, NULL);
127 umount_error(umnt_err, node);
132 * Pick up certain mount options used during the original mount
133 * from /etc/mtab. The basics include the server's IP address and
134 * the server pathname of the share to unregister.
136 * These options might also describe the mount port, mount protocol
137 * version, and transport protocol used to punch through a firewall.
138 * We will need this information to get through the firewall again
141 static int do_nfs_umount(const char *spec, char *opts)
145 clnt_addr_t mnt_server = { &hostname, };
146 struct mntent mnt = { .mnt_opts = opts };
147 struct pmap *pmap = &mnt_server.pmap;
151 nfs_error(_("%s: No NFS export name was provided"),
156 p = strchr(spec, ':');
158 nfs_error(_("%s: '%s' is not a legal NFS export name"),
162 hostname = xstrndup(spec, p - spec);
163 dirname = xstrdup(p + 1);
164 #ifdef NFS_MOUNT_DEBUG
165 printf(_("host: %s, directory: %s\n"), hostname, dirname);
168 if (opts && (p = strstr(opts, "addr="))) {
174 while (*q && *q != ',') q++;
175 hostname = xstrndup(p,q-p);
178 if (opts && (p = strstr(opts, "mounthost="))) {
184 while (*q && *q != ',') q++;
185 hostname = xstrndup(p,q-p);
188 pmap->pm_prog = MOUNTPROG;
189 pmap->pm_vers = MOUNTVERS_NFSV3;
190 if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
191 pmap->pm_prog = atoi(p+10);
192 if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
193 pmap->pm_port = atoi(p+10);
194 if (opts && hasmntopt(&mnt, "v2"))
195 pmap->pm_vers = nfsvers_to_mnt(2);
196 if (opts && hasmntopt(&mnt, "v3"))
197 pmap->pm_vers = nfsvers_to_mnt(3);
198 if (opts && hasmntopt(&mnt, "v4"))
199 pmap->pm_vers = nfsvers_to_mnt(4);
200 if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
201 pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
202 if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
203 pmap->pm_vers = atoi(p+10);
204 if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
205 pmap->pm_prot = IPPROTO_UDP;
206 if (opts && (hasmntopt(&mnt, "tcp") || hasmntopt(&mnt, "proto=tcp")))
207 pmap->pm_prot = IPPROTO_TCP;
209 if (!nfs_gethostbyname(hostname, &mnt_server.saddr)) {
210 nfs_error(_("%s: '%s' does not contain a recognized hostname"),
215 if (!nfs_call_umount(&mnt_server, &dirname)) {
216 nfs_error(_("%s: Server failed to unmount '%s'"),
224 static struct option umount_longopts[] =
226 { "force", 0, 0, 'f' },
227 { "help", 0, 0, 'h' },
228 { "no-mtab", 0, 0, 'n' },
229 { "verbose", 0, 0, 'v' },
230 { "read-only", 0, 0, 'r' },
234 static void umount_usage(void)
236 printf(_("usage: %s dir [-fvnrlh]\n"), progname);
237 printf(_("options:\n\t-f\t\tforce unmount\n"));
238 printf(_("\t-v\tverbose\n"));
239 printf(_("\t-n\tDo not update /etc/mtab\n"));
240 printf(_("\t-r\tremount\n"));
241 printf(_("\t-l\tlazy unmount\n"));
242 printf(_("\t-h\tprint this help\n\n"));
245 int nfsumount(int argc, char *argv[])
249 struct mntentchn *mc;
261 argv[0] = argv[-1]; /* So that getopt error messages are correct */
262 while ((c = getopt_long (argc, argv, "fvnrlh",
263 umount_longopts, NULL)) != -1) {
287 if (optind != argc) {
292 if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
293 nfs_error(_("%s: %s: not found\n"), progname, spec);
298 mc = getmntdirbackward(spec, NULL);
300 mc = getmntdevbackward(spec, NULL);
302 printf(_("Could not find %s in mtab\n"), spec);
304 if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
305 strcmp(mc->m.mnt_type, "nfs4") != 0) {
306 nfs_error(_("%s: %s on %s is not an NFS filesystem"),
307 progname, mc->m.mnt_fsname, mc->m.mnt_dir);
312 /* only permitted if "user=" or "users" is in mount options */
314 /* umount might call us twice. The second time there will
315 * be no entry in mtab and we should just exit quietly
320 nfs_error(_("%s: You are not permitted to unmount %s"),
324 if (hasmntopt(&mc->m, "users") == NULL) {
325 char *opt = hasmntopt(&mc->m, "user");
333 comma = strchr(opt, ',');
335 len = comma - (opt + 5);
338 pw = getpwuid(getuid());
339 if (pw == NULL || strlen(pw->pw_name) != len
340 || strncmp(pw->pw_name, opt+5, len) != 0)
348 ret = do_nfs_umount(mc->m.mnt_fsname, mc->m.mnt_opts);
350 ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
351 } else if (*spec != '/') {
353 ret = do_nfs_umount(spec, "tcp,v3");
355 ret = del_mtab(NULL, spec);