2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1980, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 static const char copyright[] =
34 "@(#) Copyright (c) 1980, 1989, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
40 static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95";
44 #include <sys/param.h>
45 #include <sys/mount.h>
46 #include <sys/socket.h>
51 #include <rpcsvc/mount.h>
52 #include <nfs/nfssvc.h>
65 typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat;
67 static struct addrinfo *nfshost_ai = NULL;
68 static int fflag, vflag;
71 struct statfs *checkmntlist(char *);
72 int checkvfsname (const char *, char **);
73 struct statfs *getmntentry(const char *fromname, const char *onname,
74 fsid_t *fsid, dowhat what);
75 char **makevfslist (const char *);
76 size_t mntinfo (struct statfs **);
77 int namematch (struct addrinfo *);
78 int parsehexfsid(const char *hex, fsid_t *fsid);
79 int sacmp (void *, void *);
80 int umountall (char **);
81 int checkname (char *, char **);
82 int umountfs(struct statfs *sfs);
84 int xdr_dir (XDR *, char *);
87 main(int argc, char *argv[])
89 int all, errs, ch, mntsize, error, nfsforce, ret;
90 char **typelist = NULL;
91 struct statfs *mntbuf, *sfs;
92 struct addrinfo hints;
94 nfsforce = all = errs = 0;
95 while ((ch = getopt(argc, argv, "AaF:fh:Nnt:v")) != -1)
109 case 'h': /* -h implies -A. */
117 fflag |= MNT_NONBUSY;
120 if (typelist != NULL)
121 err(1, "only one -t option may be specified");
122 typelist = makevfslist(optarg);
134 if ((fflag & MNT_FORCE) != 0 && (fflag & MNT_NONBUSY) != 0)
135 err(1, "-f and -n are mutually exclusive");
137 if ((argc == 0 && !all) || (argc != 0 && all))
140 if (nfsforce != 0 && (argc == 0 || nfshost != NULL || typelist != NULL))
143 /* -h implies "-t nfs" if no -t flag. */
144 if ((nfshost != NULL) && (typelist == NULL))
145 typelist = makevfslist("nfs");
147 if (nfshost != NULL) {
148 memset(&hints, 0, sizeof hints);
149 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
151 errx(1, "%s: %s", nfshost, gai_strerror(error));
156 if ((mntsize = mntinfo(&mntbuf)) <= 0)
159 * We unmount the nfs-mounts in the reverse order
160 * that they were mounted.
162 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
163 sfs = &mntbuf[mntsize];
164 if (checkvfsname(sfs->f_fstypename, typelist))
166 if (strcmp(sfs->f_mntonname, "/dev") == 0)
168 if (umountfs(sfs) != 0)
175 err(1, "%s", getfstab());
176 errs = umountall(typelist);
179 for (errs = 0; *argv != NULL; ++argv)
182 * First do the nfssvc() syscall to shut down
183 * the mount point and then do the forced
186 ret = nfssvc(NFSSVC_FORCEDISM, *argv);
188 ret = unmount(*argv, MNT_FORCE);
193 } else if (checkname(*argv, typelist) != 0)
201 umountall(char **typelist)
207 static int firstcall = 1;
209 if ((fs = getfsent()) != NULL)
212 errx(1, "fstab reading failure");
216 /* Ignore the root. */
217 if (strcmp(fs->fs_file, "/") == 0)
221 * Historic practice: ignore unknown FSTAB_* fields.
223 if (strcmp(fs->fs_type, FSTAB_RW) &&
224 strcmp(fs->fs_type, FSTAB_RO) &&
225 strcmp(fs->fs_type, FSTAB_RQ))
227 /* Ignore unknown file system types. */
228 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
230 if (checkvfsname(fs->fs_vfstype, typelist))
234 * We want to unmount the file systems in the reverse order
235 * that they were mounted. So, we save off the file name
236 * in some allocated memory, and then call recursively.
238 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
239 err(1, "malloc failed");
240 (void)strcpy(cp, fs->fs_file);
241 rval = umountall(typelist);
242 rval = checkname(cp, typelist) || rval;
245 } while ((fs = getfsent()) != NULL);
250 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
253 checkname(char *mntname, char **typelist)
255 char buf[MAXPATHLEN];
256 struct statfs sfsbuf;
264 * 1. Check if the name exists in the mounttable.
266 sfs = checkmntlist(mntname);
268 * 2. Remove trailing slashes if there are any. After that
269 * we look up the name in the mounttable again.
272 len = strlen(mntname);
273 while (len > 1 && mntname[len - 1] == '/')
274 mntname[--len] = '\0';
275 sfs = checkmntlist(mntname);
278 * 3. Check if the deprecated NFS syntax with an '@' has been used
279 * and translate it to the ':' syntax. Look up the name in the
282 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
283 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
284 (int)(delimp - mntname), mntname);
286 while (len > 1 && buf[len - 1] == '/')
288 sfs = checkmntlist(buf);
291 * 4. Resort to a statfs(2) call. This is the last check so that
292 * hung NFS filesystems for example can be unmounted without
293 * potentially blocking forever in statfs() as long as the
294 * filesystem is specified unambiguously. This covers all the
295 * hard cases such as symlinks and mismatches between the
296 * mount list and reality.
297 * We also do this if an ambiguous mount point was specified.
299 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
300 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
301 if (statfs(mntname, &sfsbuf) != 0) {
302 warn("%s: statfs", mntname);
303 } else if (stat(mntname, &sb) != 0) {
304 warn("%s: stat", mntname);
305 } else if (S_ISDIR(sb.st_mode)) {
306 /* Check that `mntname' is the root directory. */
308 snprintf(buf, sizeof(buf), "%s/..", mntname);
309 if (stat(buf, &sb) != 0) {
310 warn("%s: stat", buf);
311 } else if (sb.st_dev == dev) {
312 warnx("%s: not a file system root directory",
320 warnx("%s: unknown file system", mntname);
323 if (checkvfsname(sfs->f_fstypename, typelist))
325 return (umountfs(sfs));
329 * NFS stuff and unmount(2) call
332 umountfs(struct statfs *sfs)
335 enum clnt_stat clnt_stat;
337 struct addrinfo *ai, hints;
340 char *nfsdirname, *orignfsdirname;
341 char *hostp, *delimp;
343 struct nfscl_dumpmntopts dumpmntopts;
344 const char *proto_ptr = NULL;
349 nfsdirname = delimp = orignfsdirname = NULL;
350 memset(&hints, 0, sizeof hints);
352 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
353 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
355 orignfsdirname = nfsdirname;
356 if (*nfsdirname == '[' &&
357 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
358 *(delimp + 1) == ':') {
359 hostp = nfsdirname + 1;
360 nfsdirname = delimp + 2;
361 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
363 nfsdirname = delimp + 1;
367 getaddrinfo(hostp, NULL, &hints, &ai);
369 warnx("can't get net id for host");
374 * Check if we have to start the rpc-call later.
375 * If there are still identical nfs-names mounted,
376 * we skip the rpc-call. Obviously this has to
377 * happen before unmount(2), but it should happen
378 * after the previous namecheck.
379 * A non-NULL return means that this is the last
380 * mount from mntfromname that is still mounted.
382 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
383 CHECKUNIQUE) != NULL) {
387 * Try and find out whether this NFS mount is NFSv4 and
388 * what protocol is being used. If this fails, the
389 * default is NFSv2,3 and use UDP for the Unmount RPC.
391 dumpmntopts.ndmnt_fname = sfs->f_mntonname;
392 dumpmntopts.ndmnt_buf = buf;
393 dumpmntopts.ndmnt_blen = sizeof(buf);
394 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
395 if (strstr(buf, "nfsv4,") != NULL)
397 else if (strstr(buf, ",tcp,") != NULL)
403 if (!namematch(ai)) {
404 free(orignfsdirname);
407 /* First try to unmount using the file system ID. */
408 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
410 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
411 /* XXX, non-root users get a zero fsid, so don't warn. */
412 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
413 sfs->f_fsid.val[1] != 0)
414 warn("unmount of %s failed", sfs->f_mntonname);
415 if (errno != ENOENT) {
416 free(orignfsdirname);
419 /* Compatibility for old kernels. */
420 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
421 warnx("retrying using path instead of file system ID");
422 if (unmount(sfs->f_mntonname, fflag) != 0) {
423 warn("unmount of %s failed", sfs->f_mntonname);
424 free(orignfsdirname);
428 /* Mark this file system as unmounted. */
429 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
431 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
434 * Report to mountd-server which nfsname
435 * has been unmounted.
437 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
438 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
440 warnx("%s: %s", hostp,
441 clnt_spcreateerror("MOUNTPROG"));
442 free(orignfsdirname);
445 clp->cl_auth = authsys_create_default();
448 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
449 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
450 if (clnt_stat != RPC_SUCCESS) {
451 warnx("%s: %s", hostp,
452 clnt_sperror(clp, "RPCMNT_UMOUNT"));
453 free(orignfsdirname);
457 * Remove the unmounted entry from /var/db/mounttab.
460 clean_mtab(hostp, nfsdirname, vflag);
461 if(!write_mtab(vflag))
462 warnx("cannot remove mounttab entry %s:%s",
466 auth_destroy(clp->cl_auth);
469 free(orignfsdirname);
474 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
476 static struct statfs *mntbuf;
477 static size_t mntsize = 0;
478 static int *mntcheck = NULL;
479 struct statfs *sfs, *foundsfs;
483 if ((mntsize = mntinfo(&mntbuf)) <= 0)
486 if (mntcheck == NULL) {
487 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
491 * We want to get the file systems in the reverse order
492 * that they were mounted. Unmounted file systems are marked
493 * in a table called 'mntcheck'.
497 for (i = mntsize - 1; i >= 0; i--) {
501 if (fromname != NULL && strcmp(sfs->f_mntfromname,
504 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
506 if (fsid != NULL && fsidcmp(&sfs->f_fsid, fsid) != 0)
523 if (what == CHECKUNIQUE && count == 1)
529 sacmp(void *sa1, void *sa2)
534 if (((struct sockaddr *)sa1)->sa_family !=
535 ((struct sockaddr *)sa2)->sa_family)
538 switch (((struct sockaddr *)sa1)->sa_family) {
540 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
541 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
545 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
546 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
548 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
549 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
556 return memcmp(p1, p2, len);
560 namematch(struct addrinfo *ai)
562 struct addrinfo *aip;
564 if (nfshost == NULL || nfshost_ai == NULL)
569 while (aip != NULL) {
570 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
581 checkmntlist(char *mntname)
587 if (parsehexfsid(mntname, &fsid) == 0)
588 sfs = getmntentry(NULL, NULL, &fsid, FIND);
590 sfs = getmntentry(NULL, mntname, NULL, FIND);
592 sfs = getmntentry(mntname, NULL, NULL, FIND);
597 mntinfo(struct statfs **mntbuf)
599 static struct statfs *origbuf;
603 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
606 bufsize = (mntsize + 1) * sizeof(struct statfs);
607 if ((origbuf = malloc(bufsize)) == NULL)
609 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
615 * Convert a hexadecimal filesystem ID to an fsid_t.
616 * Returns 0 on success.
619 parsehexfsid(const char *hex, fsid_t *fsid)
624 if (strlen(hex) != sizeof(*fsid) * 2)
627 for (i = 0; i < (int)sizeof(*fsid); i++) {
628 hexbuf[0] = hex[i * 2];
629 hexbuf[1] = hex[i * 2 + 1];
630 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
632 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
638 * xdr routines for mount rpc's
641 xdr_dir(XDR *xdrsp, char *dirp)
644 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
651 (void)fprintf(stderr, "%s\n%s\n",
652 "usage: umount [-fNnv] special ... | node ... | fsid ...",
653 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]");