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>
34 #include "mount_constants.h"
36 #include "nfsumount.h"
40 #if !defined(MNT_FORCE)
41 /* dare not try to include <linux/mount.h> -- lots of errors */
45 #if !defined(MNT_DETACH)
49 extern char *progname;
56 static int del_mtab(const char *spec, const char *node)
62 res = umount2 (node, MNT_DETACH);
69 res = umount2 (node, MNT_FORCE);
74 if (errno == ENOSYS) {
76 printf(_("no umount2, trying umount...\n"));
83 if (res < 0 && remount && errno == EBUSY && spec) {
84 /* Umount failed - let us try a remount */
85 res = mount(spec, node, NULL,
86 MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
89 nfs_error(_("%s: %s busy - remounted read-only"),
91 remnt.mnt_type = remnt.mnt_fsname = NULL;
92 remnt.mnt_dir = xstrdup(node);
93 remnt.mnt_opts = xstrdup("ro");
95 update_mtab(node, &remnt);
97 } else if (errno != EBUSY) { /* hmm ... */
99 nfs_error(_("%s: could not remount %s read-only"),
105 /* Umount succeeded */
107 printf (_("%s umounted\n"), spec ? spec : node);
112 (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
113 update_mtab(node, NULL);
120 umount_error(umnt_err, node);
124 static int do_nfs_umount(const char *spec, char *opts)
128 clnt_addr_t mnt_server = { &hostname, };
129 struct mntent mnt = { .mnt_opts = opts };
130 struct pmap *pmap = &mnt_server.pmap;
134 nfs_error(_("%s: No NFS export name was provided"),
139 p = strchr(spec, ':');
141 nfs_error(_("%s: '%s' is not a legal NFS export name"),
145 hostname = xstrndup(spec, p - spec);
146 dirname = xstrdup(p + 1);
147 #ifdef NFS_MOUNT_DEBUG
148 printf(_("host: %s, directory: %s\n"), hostname, dirname);
151 if (opts && (p = strstr(opts, "addr="))) {
157 while (*q && *q != ',') q++;
158 hostname = xstrndup(p,q-p);
161 if (opts && (p = strstr(opts, "mounthost="))) {
167 while (*q && *q != ',') q++;
168 hostname = xstrndup(p,q-p);
171 pmap->pm_prog = MOUNTPROG;
172 pmap->pm_vers = MOUNTVERS_NFSV3;
173 if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
174 pmap->pm_prog = atoi(p+10);
175 if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
176 pmap->pm_port = atoi(p+10);
177 if (opts && hasmntopt(&mnt, "v2"))
178 pmap->pm_vers = nfsvers_to_mnt(2);
179 if (opts && hasmntopt(&mnt, "v3"))
180 pmap->pm_vers = nfsvers_to_mnt(3);
181 if (opts && hasmntopt(&mnt, "v4"))
182 pmap->pm_vers = nfsvers_to_mnt(4);
183 if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
184 pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
185 if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
186 pmap->pm_vers = atoi(p+10);
187 if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
188 pmap->pm_prot = IPPROTO_UDP;
190 if (!nfs_gethostbyname(hostname, &mnt_server.saddr)) {
191 nfs_error(_("%s: '%s' does not contain a recognized hostname"),
196 if (!nfs_call_umount(&mnt_server, &dirname)) {
197 nfs_error(_("%s: Server failed to unmount '%s'"),
205 static struct option umount_longopts[] =
207 { "force", 0, 0, 'f' },
208 { "help", 0, 0, 'h' },
209 { "no-mtab", 0, 0, 'n' },
210 { "verbose", 0, 0, 'v' },
211 { "read-only", 0, 0, 'r' },
215 static void umount_usage(void)
217 printf("usage: %s dir [-fvnrlh]\n", progname);
218 printf("options:\n\t-f\t\tforce unmount\n");
219 printf("\t-v\t\tverbose\n");
220 printf("\t-n\t\tDo not update /etc/mtab\n");
221 printf("\t-r\t\tremount\n");
222 printf("\t-l\t\tlazy unmount\n");
223 printf("\t-h\t\tprint this help\n\n");
226 int nfsumount(int argc, char *argv[])
230 struct mntentchn *mc;
242 argv[0] = argv[-1]; /* So that getopt error messages are correct */
243 while ((c = getopt_long (argc, argv, "fvnrlh",
244 umount_longopts, NULL)) != -1) {
268 if (optind != argc) {
273 if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
274 nfs_error(_("%s: %s: not found\n"), progname, spec);
279 mc = getmntdirbackward(spec, NULL);
281 mc = getmntdevbackward(spec, NULL);
283 printf(_("Could not find %s in mtab\n"), spec);
285 if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
286 strcmp(mc->m.mnt_type, "nfs4") != 0) {
287 nfs_error(_("%s: %s on %s it not an nfs filesystem"),
288 progname, mc->m.mnt_fsname, mc->m.mnt_dir);
293 /* only permitted if "user=" or "users" is in mount options */
295 /* umount might call us twice. The second time there will
296 * be no entry in mtab and we should just exit quietly
301 nfs_error(_("%s: You are not permitted to unmount %s"),
305 if (hasmntopt(&mc->m, "users") == NULL) {
306 char *opt = hasmntopt(&mc->m, "user");
314 comma = strchr(opt, ',');
316 len = comma - (opt + 5);
319 pw = getpwuid(getuid());
320 if (pw == NULL || strlen(pw->pw_name) != len
321 || strncmp(pw->pw_name, opt+5, len) != 0)
329 do_nfs_umount(mc->m.mnt_fsname, mc->m.mnt_opts);
330 ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
331 } else if (*spec != '/') {
333 do_nfs_umount(spec, "tcp,v3");
335 ret = del_mtab(NULL, spec);