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 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);
125 * Returns 1 if everything went well, else 0.
127 int _nfsumount(const char *spec, char *opts)
131 clnt_addr_t mnt_server = { &hostname, };
132 struct mntent mnt = { .mnt_opts = opts };
133 struct pmap *pmap = &mnt_server.pmap;
136 if (spec == NULL || (p = strchr(spec,':')) == NULL)
138 hostname = xstrndup(spec, p-spec);
139 dirname = xstrdup(p+1);
140 #ifdef NFS_MOUNT_DEBUG
141 printf(_("host: %s, directory: %s\n"), hostname, dirname);
144 if (opts && (p = strstr(opts, "addr="))) {
150 while (*q && *q != ',') q++;
151 hostname = xstrndup(p,q-p);
154 if (opts && (p = strstr(opts, "mounthost="))) {
160 while (*q && *q != ',') q++;
161 hostname = xstrndup(p,q-p);
164 pmap->pm_prog = MOUNTPROG;
165 pmap->pm_vers = MOUNTVERS_NFSV3;
166 if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
167 pmap->pm_prog = atoi(p+10);
168 if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
169 pmap->pm_port = atoi(p+10);
170 if (opts && hasmntopt(&mnt, "v2"))
171 pmap->pm_vers = nfsvers_to_mnt(2);
172 if (opts && hasmntopt(&mnt, "v3"))
173 pmap->pm_vers = nfsvers_to_mnt(3);
174 if (opts && hasmntopt(&mnt, "v4"))
175 pmap->pm_vers = nfsvers_to_mnt(4);
176 if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
177 pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
178 if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
179 pmap->pm_vers = atoi(p+10);
180 if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
181 pmap->pm_prot = IPPROTO_UDP;
183 if (!nfs_gethostbyname(hostname, &mnt_server.saddr))
185 return nfs_call_umount(&mnt_server, &dirname);
187 nfs_error(_("%s: %s: not found or not mounted"), progname, spec);
191 static struct option umount_longopts[] =
193 { "force", 0, 0, 'f' },
194 { "help", 0, 0, 'h' },
195 { "no-mtab", 0, 0, 'n' },
196 { "verbose", 0, 0, 'v' },
197 { "read-only", 0, 0, 'r' },
201 static void umount_usage(void)
203 printf("usage: %s dir [-fvnrlh]\n", progname);
204 printf("options:\n\t-f\t\tforce unmount\n");
205 printf("\t-v\t\tverbose\n");
206 printf("\t-n\t\tDo not update /etc/mtab\n");
207 printf("\t-r\t\tremount\n");
208 printf("\t-l\t\tlazy unmount\n");
209 printf("\t-h\t\tprint this help\n\n");
212 int nfsumount(int argc, char *argv[])
216 struct mntentchn *mc;
228 argv[0] = argv[-1]; /* So that getopt error messages are correct */
229 while ((c = getopt_long (argc, argv, "fvnrlh",
230 umount_longopts, NULL)) != -1) {
254 if (optind != argc) {
259 if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
260 nfs_error(_("%s: %s: not found\n"), progname, spec);
265 mc = getmntdirbackward(spec, NULL);
267 mc = getmntdevbackward(spec, NULL);
269 printf(_("Could not find %s in mtab\n"), spec);
271 if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
272 strcmp(mc->m.mnt_type, "nfs4") != 0) {
273 nfs_error(_("%s: %s on %s it not an nfs filesystem"),
274 progname, mc->m.mnt_fsname, mc->m.mnt_dir);
279 /* only permitted if "user=" or "users" is in mount options */
281 /* umount might call us twice. The second time there will
282 * be no entry in mtab and we should just exit quietly
287 nfs_error(_("%s: You are not permitted to unmount %s"),
291 if (hasmntopt(&mc->m, "users") == NULL) {
292 char *opt = hasmntopt(&mc->m, "user");
300 comma = strchr(opt, ',');
302 len = comma - (opt + 5);
305 pw = getpwuid(getuid());
306 if (pw == NULL || strlen(pw->pw_name) != len
307 || strncmp(pw->pw_name, opt+5, len) != 0)
315 _nfsumount(mc->m.mnt_fsname, mc->m.mnt_opts);
316 ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
317 } else if (*spec != '/') {
319 _nfsumount(spec, "tcp,v3");
321 ret = del_mtab(NULL, spec);