2 * Copyright (c) 1980, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1980, 1989, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)umount.c 8.8 (Berkeley) 5/8/95
35 * $FreeBSD: src/sbin/umount/umount.c,v 1.28 2001/10/13 02:04:54 iedowse Exp $
36 * $DragonFly: src/sbin/umount/umount.c,v 1.4 2005/11/06 12:51:01 swildner Exp $
39 #include <sys/param.h>
40 #include <sys/mount.h>
41 #include <sys/socket.h>
45 #include <nfs/rpcv2.h>
56 #define ISDOT(x) ((x)[0] == '.' && (x)[1] == '\0')
57 #define ISDOTDOT(x) ((x)[0] == '.' && (x)[1] == '.' && (x)[2] == '\0')
59 typedef enum { MNTON, MNTFROM, NOTHING } mntwhat;
60 typedef enum { MARK, UNMARK, NAME, COUNT, FREE } dowhat;
62 struct addrinfo *nfshost_ai = NULL;
66 void checkmntlist (char *, char **, char **, char **);
67 int checkvfsname (const char *, char **);
68 char *getmntname (const char *, const char *,
69 mntwhat, char **, dowhat);
70 char *getrealname(char *, char *resolved_path);
71 char **makevfslist (const char *);
72 int mntinfo (struct statfs **);
73 int namematch (struct addrinfo *);
74 int sacmp (struct sockaddr *, struct sockaddr *);
75 int umountall (char **);
76 int checkname (char *, char **);
77 int umountfs (char *, char *, char *);
79 int xdr_dir (XDR *, char *);
82 main(int argc, char *argv[])
84 int all, errs, ch, mntsize, error;
85 char **typelist = NULL, *mntonname, *mntfromname;
86 char *type, *mntfromnamerev, *mntonnamerev;
87 struct statfs *mntbuf;
88 struct addrinfo hints;
91 while ((ch = getopt(argc, argv, "AaF:fh:t:v")) != -1) {
105 case 'h': /* -h implies -A. */
110 if (typelist != NULL)
111 err(1, "only one -t option may be specified");
112 typelist = makevfslist(optarg);
125 if ((argc == 0 && !all) || (argc != 0 && all))
128 /* -h implies "-t nfs" if no -t flag. */
129 if ((nfshost != NULL) && (typelist == NULL))
130 typelist = makevfslist("nfs");
132 if (nfshost != NULL) {
133 memset(&hints, 0, sizeof hints);
134 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
136 errx(1, "%s: %s", nfshost, gai_strerror(error));
141 if ((mntsize = mntinfo(&mntbuf)) <= 0)
144 * We unmount the nfs-mounts in the reverse order
145 * that they were mounted.
147 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
148 if (checkvfsname(mntbuf[mntsize].f_fstypename,
152 * Check if a mountpoint is laid over by another mount.
153 * A warning will be printed to stderr if this is
154 * the case. The laid over mount remains unmounted.
156 mntonname = mntbuf[mntsize].f_mntonname;
157 mntfromname = mntbuf[mntsize].f_mntfromname;
158 mntonnamerev = getmntname(getmntname(mntonname,
159 NULL, MNTFROM, &type, NAME), NULL,
162 mntfromnamerev = getmntname(mntonnamerev,
163 NULL, MNTFROM, &type, NAME);
165 if (strcmp(mntonnamerev, mntonname) == 0 &&
166 strcmp(mntfromnamerev, mntfromname ) != 0)
167 warnx("cannot umount %s, %s\n "
168 "is mounted there, umount it first",
169 mntonname, mntfromnamerev);
171 if (checkname(mntbuf[mntsize].f_mntonname,
179 err(1, "%s", getfstab());
180 errs = umountall(typelist);
183 for (errs = 0; *argv != NULL; ++argv)
184 if (checkname(*argv, typelist) != 0)
188 getmntname(NULL, NULL, NOTHING, NULL, FREE);
193 umountall(char **typelist)
199 static int firstcall = 1;
201 if ((fs = getfsent()) != NULL)
204 errx(1, "fstab reading failure");
208 /* Ignore the root. */
209 if (strcmp(fs->fs_file, "/") == 0)
213 * Historic practice: ignore unknown FSTAB_* fields.
215 if (strcmp(fs->fs_type, FSTAB_RW) &&
216 strcmp(fs->fs_type, FSTAB_RO) &&
217 strcmp(fs->fs_type, FSTAB_RQ))
219 /* Ignore unknown file system types. */
220 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
222 if (checkvfsname(fs->fs_vfstype, typelist))
226 * We want to unmount the file systems in the reverse order
227 * that they were mounted. So, we save off the file name
228 * in some allocated memory, and then call recursively.
230 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
231 err(1, "malloc failed");
232 strcpy(cp, fs->fs_file);
233 rval = umountall(typelist);
234 rval = checkname(cp, typelist) || rval;
237 } while ((fs = getfsent()) != NULL);
242 * Do magic checks on mountpoint and device or hand over
243 * it to unmount(2) if everything fails.
246 checkname(char *name, char **typelist)
250 char *mntonname, *mntfromname;
251 char *mntfromnamerev;
252 char *resolved, realname[MAXPATHLEN];
253 char *type, *hostp, *delimp, *origname;
254 char none[] = "none";
257 mntfromname = mntonname = delimp = hostp = NULL;
260 * 1. Check if the name exists in the mounttable.
262 checkmntlist(name, &mntfromname, &mntonname, &type);
263 if (mntfromname == NULL && mntonname == NULL) {
264 checkmntlist(getdevpath(name, 0), &mntfromname,
269 * 2. Remove trailing slashes if there are any. After that
270 * we look up the name in the mounttable again.
272 if (mntfromname == NULL && mntonname == NULL) {
273 speclen = strlen(name);
274 for (speclen = strlen(name);
275 speclen > 1 && name[speclen - 1] == '/';
277 name[speclen - 1] = '\0';
278 checkmntlist(name, &mntfromname, &mntonname, &type);
280 /* Save off original name in origname */
281 if ((origname = strdup(name)) == NULL)
284 * 3. Check if the deprecated nfs-syntax with an '@'
285 * has been used and translate it to the ':' syntax.
286 * Look up the name in the mounttable again.
288 if (mntfromname == NULL && mntonname == NULL) {
289 if ((delimp = strrchr(name, '@')) != NULL) {
291 if (*hostp != '\0') {
293 * Make both '@' and ':'
296 char *host = strdup(hostp);
300 memmove(name + len + 1, name,
301 (size_t)(delimp - name));
303 memmove(name, host, len);
306 for (speclen = strlen(name);
307 speclen > 1 && name[speclen - 1] == '/';
309 name[speclen - 1] = '\0';
310 name[len + speclen + 1] = '\0';
311 checkmntlist(name, &mntfromname,
316 * 4. Check if a relative mountpoint has been
317 * specified. This should happen as last check,
318 * the order is important. To prevent possible
319 * nfs-hangs, we just call realpath(3) on the
320 * basedir of mountpoint and add the dirname again.
321 * Check the name in mounttable one last time.
323 if (mntfromname == NULL && mntonname == NULL) {
324 strcpy(name, origname);
325 if ((getrealname(name, realname)) != NULL) {
326 checkmntlist(realname,
327 &mntfromname, &mntonname, &type);
331 * 5. All tests failed, just hand over the
332 * mountpoint to the kernel, maybe the statfs
333 * structure has been truncated or is not
334 * useful anymore because of a chroot(2).
335 * Please note that nfs will not be able to
336 * notify the nfs-server about unmounting.
337 * These things can change in future when the
338 * fstat structure get's more reliable,
339 * but at the moment we cannot thrust it.
341 if (mntfromname == NULL && mntonname == NULL) {
342 strcpy(name, origname);
343 if (umountfs(NULL, origname,
345 warnx("%s not found in "
347 "unmounted it anyway",
361 if (checkvfsname(type, typelist))
365 * Check if the reverse entrys of the mounttable are really the
366 * same as the normal ones.
368 if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
369 NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
372 * Mark the uppermost mount as unmounted.
374 getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
376 * If several equal mounts are in the mounttable, check the order
377 * and warn the user if necessary.
379 if (strcmp(mntfromnamerev, mntfromname ) != 0 &&
380 strcmp(resolved, mntonname) != 0) {
381 warnx("cannot umount %s, %s\n "
382 "is mounted there, umount it first",
383 mntonname, mntfromnamerev);
385 /* call getmntname again to set mntcheck[i] to 0 */
386 getmntname(mntfromname, mntonname,
387 NOTHING, &type, UNMARK);
390 free(mntfromnamerev);
391 return (umountfs(mntfromname, mntonname, type));
395 * NFS stuff and unmount(2) call
398 umountfs(char *mntfromname, char *mntonname, char *type)
400 enum clnt_stat clnt_stat;
402 struct addrinfo *ai, hints;
405 char *nfsdirname, *orignfsdirname;
406 char *hostp, *delimp;
411 nfsdirname = delimp = orignfsdirname = NULL;
412 memset(&hints, 0, sizeof hints);
414 if (strcmp(type, "nfs") == 0) {
415 if ((nfsdirname = strdup(mntfromname)) == NULL)
417 orignfsdirname = nfsdirname;
418 if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
421 getaddrinfo(hostp, NULL, &hints, &ai);
423 warnx("can't get net id for host");
425 nfsdirname = delimp + 1;
429 * Check if we have to start the rpc-call later.
430 * If there are still identical nfs-names mounted,
431 * we skip the rpc-call. Obviously this has to
432 * happen before unmount(2), but it should happen
433 * after the previous namecheck.
434 * A non-NULL return means that this is the last
435 * mount from mntfromname that is still mounted.
437 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT)
444 if (unmount(mntonname, fflag) != 0 ) {
445 warn("unmount of %s failed", mntonname);
449 printf("%s: unmount from %s\n", mntfromname, mntonname);
451 * Report to mountd-server which nfsname
452 * has been unmounted.
454 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
455 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
457 warnx("%s: %s", hostp,
458 clnt_spcreateerror("RPCPROG_MNT"));
461 clp->cl_auth = authsys_create_default();
464 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir,
465 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
466 if (clnt_stat != RPC_SUCCESS) {
467 warnx("%s: %s", hostp,
468 clnt_sperror(clp, "RPCMNT_UMOUNT"));
472 * Remove the unmounted entry from /var/db/mounttab.
475 clean_mtab(hostp, nfsdirname, vflag);
476 if(!write_mtab(vflag))
477 warnx("cannot remove mounttab entry %s:%s",
481 free(orignfsdirname);
482 auth_destroy(clp->cl_auth);
489 getmntname(const char *fromname, const char *onname,
490 mntwhat what, char **type, dowhat mark)
492 static struct statfs *mntbuf;
493 static int mntsize = 0;
494 static char *mntcheck = NULL;
495 static char *mntcount = NULL;
499 if ((mntsize = mntinfo(&mntbuf)) <= 0)
502 if (mntcheck == NULL) {
503 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL ||
504 (mntcount = calloc(mntsize + 1, sizeof(int))) == NULL)
508 * We want to get the file systems in the reverse order
509 * that they were mounted. Mounted and unmounted filesystems
510 * are marked or unmarked in a table called 'mntcheck'.
511 * Unmount(const char *dir, int flags) does only take the
512 * mountpoint as argument, not the destination. If we don't pay
513 * attention to the order, it can happen that a overlaying
514 * filesystem get's unmounted instead of the one the user
519 /* Return only the specific name */
520 for (i = mntsize - 1; i >= 0; i--) {
521 if (fromname != NULL && what == MNTON &&
522 !strcmp(mntbuf[i].f_mntfromname, fromname) &&
525 *type = mntbuf[i].f_fstypename;
526 return (mntbuf[i].f_mntonname);
528 if (fromname != NULL && what == MNTFROM &&
529 !strcmp(mntbuf[i].f_mntonname, fromname) &&
532 *type = mntbuf[i].f_fstypename;
533 return (mntbuf[i].f_mntfromname);
538 /* Mark current mount with '1' and return name */
539 for (i = mntsize - 1; i >= 0; i--) {
540 if (mntcheck[i] == 0 &&
541 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
542 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
544 return (mntbuf[i].f_mntonname);
549 /* Unmark current mount with '0' and return name */
550 for (i = 0; i < mntsize; i++) {
551 if (mntcheck[i] == 1 &&
552 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
553 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
555 return (mntbuf[i].f_mntonname);
560 /* Count the equal mntfromnames */
562 for (i = mntsize - 1; i >= 0; i--) {
563 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)
566 /* Mark the already unmounted mounts and return
567 * mntfromname if count <= 1. Else return NULL.
569 for (i = mntsize - 1; i >= 0; i--) {
570 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) {
571 if (mntcount[i] == 1)
580 return (mntbuf[i].f_mntonname);
594 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
599 if (sa1->sa_family != sa2->sa_family)
602 switch (sa1->sa_family) {
604 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
605 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
609 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
610 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
612 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
613 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
620 return memcmp(p1, p2, len);
624 namematch(struct addrinfo *ai)
626 struct addrinfo *aip;
628 if (nfshost == NULL || nfshost_ai == NULL)
633 while (aip != NULL) {
634 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
645 checkmntlist(char *name, char **fromname, char **onname, char **type)
648 *fromname = getmntname(name, NULL, MNTFROM, type, NAME);
649 if (*fromname == NULL) {
650 *onname = getmntname(name, NULL, MNTON, type, NAME);
658 mntinfo(struct statfs **mntbuf)
660 static struct statfs *origbuf;
664 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
667 bufsize = (mntsize + 1) * sizeof(struct statfs);
668 if ((origbuf = malloc(bufsize)) == NULL)
670 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
676 getrealname(char *name, char *realname)
686 if (ISDOT(name + 1) || ISDOTDOT(name + 1))
687 strcpy(realname, "/");
689 if ((dirname = strrchr(name + 1, '/')) == NULL)
690 snprintf(realname, MAXPATHLEN, "%s", name);
695 if (ISDOT(name) || ISDOTDOT(name))
696 realpath(name, realname);
698 if ((dirname = strrchr(name, '/')) == NULL) {
699 if ((realpath(name, realname)) == NULL)
707 if (ISDOT(dirname)) {
709 if ((realpath(name, realname)) == NULL)
711 } else if (ISDOTDOT(dirname)) {
713 if ((realpath(name, realname)) == NULL)
716 if ((realpath(name, realname)) == NULL)
718 baselen = strlen(realname);
719 dirlen = strlen(dirname);
720 if (baselen + dirlen + 1 > MAXPATHLEN)
722 if (realname[1] == '\0') {
723 memmove(realname + 1, dirname, dirlen);
724 realname[dirlen + 1] = '\0';
726 realname[baselen] = '/';
727 memmove(realname + baselen + 1,
729 realname[baselen + dirlen + 1] = '\0';
737 * xdr routines for mount rpc's
740 xdr_dir(XDR *xdrsp, char *dirp)
743 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
750 fprintf(stderr, "%s\n%s\n",
751 "usage: umount [-fv] special | node",
752 " umount -a | -A [-F fstab] [-fv] [-h host] [-t type]");