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";
42 static const char rcsid[] =
46 #include <sys/param.h>
47 #include <sys/mount.h>
48 #include <sys/socket.h>
53 #include <rpcsvc/mount.h>
54 #include <nfs/nfssvc.h>
67 typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat;
69 static struct addrinfo *nfshost_ai = NULL;
70 static int fflag, vflag;
73 struct statfs *checkmntlist(char *);
74 int checkvfsname (const char *, char **);
75 struct statfs *getmntentry(const char *fromname, const char *onname,
76 fsid_t *fsid, dowhat what);
77 char **makevfslist (const char *);
78 size_t mntinfo (struct statfs **);
79 int namematch (struct addrinfo *);
80 int parsehexfsid(const char *hex, fsid_t *fsid);
81 int sacmp (void *, void *);
82 int umountall (char **);
83 int checkname (char *, char **);
84 int umountfs(struct statfs *sfs);
86 int xdr_dir (XDR *, char *);
89 main(int argc, char *argv[])
91 int all, errs, ch, mntsize, error, nfsforce, ret;
92 char **typelist = NULL;
93 struct statfs *mntbuf, *sfs;
94 struct addrinfo hints;
96 nfsforce = all = errs = 0;
97 while ((ch = getopt(argc, argv, "AaF:fh:Nnt:v")) != -1)
111 case 'h': /* -h implies -A. */
119 fflag |= MNT_NONBUSY;
122 if (typelist != NULL)
123 err(1, "only one -t option may be specified");
124 typelist = makevfslist(optarg);
136 if ((fflag & MNT_FORCE) != 0 && (fflag & MNT_NONBUSY) != 0)
137 err(1, "-f and -n are mutually exclusive");
139 /* Start disks transferring immediately. */
140 if ((fflag & (MNT_FORCE | MNT_NONBUSY)) == 0 && nfsforce == 0)
143 if ((argc == 0 && !all) || (argc != 0 && all))
146 if (nfsforce != 0 && (argc == 0 || nfshost != NULL || typelist != NULL))
149 /* -h implies "-t nfs" if no -t flag. */
150 if ((nfshost != NULL) && (typelist == NULL))
151 typelist = makevfslist("nfs");
153 if (nfshost != NULL) {
154 memset(&hints, 0, sizeof hints);
155 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
157 errx(1, "%s: %s", nfshost, gai_strerror(error));
162 if ((mntsize = mntinfo(&mntbuf)) <= 0)
165 * We unmount the nfs-mounts in the reverse order
166 * that they were mounted.
168 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
169 sfs = &mntbuf[mntsize];
170 if (checkvfsname(sfs->f_fstypename, typelist))
172 if (strcmp(sfs->f_mntonname, "/dev") == 0)
174 if (umountfs(sfs) != 0)
181 err(1, "%s", getfstab());
182 errs = umountall(typelist);
185 for (errs = 0; *argv != NULL; ++argv)
188 * First do the nfssvc() syscall to shut down
189 * the mount point and then do the forced
192 ret = nfssvc(NFSSVC_FORCEDISM, *argv);
194 ret = unmount(*argv, MNT_FORCE);
199 } else if (checkname(*argv, typelist) != 0)
207 umountall(char **typelist)
213 static int firstcall = 1;
215 if ((fs = getfsent()) != NULL)
218 errx(1, "fstab reading failure");
222 /* Ignore the root. */
223 if (strcmp(fs->fs_file, "/") == 0)
227 * Historic practice: ignore unknown FSTAB_* fields.
229 if (strcmp(fs->fs_type, FSTAB_RW) &&
230 strcmp(fs->fs_type, FSTAB_RO) &&
231 strcmp(fs->fs_type, FSTAB_RQ))
233 /* Ignore unknown file system types. */
234 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
236 if (checkvfsname(fs->fs_vfstype, typelist))
240 * We want to unmount the file systems in the reverse order
241 * that they were mounted. So, we save off the file name
242 * in some allocated memory, and then call recursively.
244 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
245 err(1, "malloc failed");
246 (void)strcpy(cp, fs->fs_file);
247 rval = umountall(typelist);
248 rval = checkname(cp, typelist) || rval;
251 } while ((fs = getfsent()) != NULL);
256 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
259 checkname(char *mntname, char **typelist)
261 char buf[MAXPATHLEN];
262 struct statfs sfsbuf;
270 * 1. Check if the name exists in the mounttable.
272 sfs = checkmntlist(mntname);
274 * 2. Remove trailing slashes if there are any. After that
275 * we look up the name in the mounttable again.
278 len = strlen(mntname);
279 while (len > 1 && mntname[len - 1] == '/')
280 mntname[--len] = '\0';
281 sfs = checkmntlist(mntname);
284 * 3. Check if the deprecated NFS syntax with an '@' has been used
285 * and translate it to the ':' syntax. Look up the name in the
288 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
289 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
290 (int)(delimp - mntname), mntname);
292 while (len > 1 && buf[len - 1] == '/')
294 sfs = checkmntlist(buf);
297 * 4. Resort to a statfs(2) call. This is the last check so that
298 * hung NFS filesystems for example can be unmounted without
299 * potentially blocking forever in statfs() as long as the
300 * filesystem is specified unambiguously. This covers all the
301 * hard cases such as symlinks and mismatches between the
302 * mount list and reality.
303 * We also do this if an ambiguous mount point was specified.
305 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
306 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
307 if (statfs(mntname, &sfsbuf) != 0) {
308 warn("%s: statfs", mntname);
309 } else if (stat(mntname, &sb) != 0) {
310 warn("%s: stat", mntname);
311 } else if (S_ISDIR(sb.st_mode)) {
312 /* Check that `mntname' is the root directory. */
314 snprintf(buf, sizeof(buf), "%s/..", mntname);
315 if (stat(buf, &sb) != 0) {
316 warn("%s: stat", buf);
317 } else if (sb.st_dev == dev) {
318 warnx("%s: not a file system root directory",
326 warnx("%s: unknown file system", mntname);
329 if (checkvfsname(sfs->f_fstypename, typelist))
331 return (umountfs(sfs));
335 * NFS stuff and unmount(2) call
338 umountfs(struct statfs *sfs)
341 enum clnt_stat clnt_stat;
343 struct addrinfo *ai, hints;
346 char *nfsdirname, *orignfsdirname;
347 char *hostp, *delimp;
349 struct nfscl_dumpmntopts dumpmntopts;
350 const char *proto_ptr = NULL;
355 nfsdirname = delimp = orignfsdirname = NULL;
356 memset(&hints, 0, sizeof hints);
358 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
359 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
361 orignfsdirname = nfsdirname;
362 if (*nfsdirname == '[' &&
363 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
364 *(delimp + 1) == ':') {
365 hostp = nfsdirname + 1;
366 nfsdirname = delimp + 2;
367 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
369 nfsdirname = delimp + 1;
373 getaddrinfo(hostp, NULL, &hints, &ai);
375 warnx("can't get net id for host");
380 * Check if we have to start the rpc-call later.
381 * If there are still identical nfs-names mounted,
382 * we skip the rpc-call. Obviously this has to
383 * happen before unmount(2), but it should happen
384 * after the previous namecheck.
385 * A non-NULL return means that this is the last
386 * mount from mntfromname that is still mounted.
388 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
389 CHECKUNIQUE) != NULL) {
393 * Try and find out whether this NFS mount is NFSv4 and
394 * what protocol is being used. If this fails, the
395 * default is NFSv2,3 and use UDP for the Unmount RPC.
397 dumpmntopts.ndmnt_fname = sfs->f_mntonname;
398 dumpmntopts.ndmnt_buf = buf;
399 dumpmntopts.ndmnt_blen = sizeof(buf);
400 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
401 if (strstr(buf, "nfsv4,") != NULL)
403 else if (strstr(buf, ",tcp,") != NULL)
409 if (!namematch(ai)) {
410 free(orignfsdirname);
413 /* First try to unmount using the file system ID. */
414 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
416 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
417 /* XXX, non-root users get a zero fsid, so don't warn. */
418 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
419 sfs->f_fsid.val[1] != 0)
420 warn("unmount of %s failed", sfs->f_mntonname);
421 if (errno != ENOENT) {
422 free(orignfsdirname);
425 /* Compatibility for old kernels. */
426 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
427 warnx("retrying using path instead of file system ID");
428 if (unmount(sfs->f_mntonname, fflag) != 0) {
429 warn("unmount of %s failed", sfs->f_mntonname);
430 free(orignfsdirname);
434 /* Mark this this file system as unmounted. */
435 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
437 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
440 * Report to mountd-server which nfsname
441 * has been unmounted.
443 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
444 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
446 warnx("%s: %s", hostp,
447 clnt_spcreateerror("MOUNTPROG"));
448 free(orignfsdirname);
451 clp->cl_auth = authsys_create_default();
454 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
455 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
456 if (clnt_stat != RPC_SUCCESS) {
457 warnx("%s: %s", hostp,
458 clnt_sperror(clp, "RPCMNT_UMOUNT"));
459 free(orignfsdirname);
463 * Remove the unmounted entry from /var/db/mounttab.
466 clean_mtab(hostp, nfsdirname, vflag);
467 if(!write_mtab(vflag))
468 warnx("cannot remove mounttab entry %s:%s",
472 auth_destroy(clp->cl_auth);
475 free(orignfsdirname);
480 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
482 static struct statfs *mntbuf;
483 static size_t mntsize = 0;
484 static int *mntcheck = NULL;
485 struct statfs *sfs, *foundsfs;
489 if ((mntsize = mntinfo(&mntbuf)) <= 0)
492 if (mntcheck == NULL) {
493 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
497 * We want to get the file systems in the reverse order
498 * that they were mounted. Unmounted file systems are marked
499 * in a table called 'mntcheck'.
503 for (i = mntsize - 1; i >= 0; i--) {
507 if (fromname != NULL && strcmp(sfs->f_mntfromname,
510 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
512 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
530 if (what == CHECKUNIQUE && count == 1)
536 sacmp(void *sa1, void *sa2)
541 if (((struct sockaddr *)sa1)->sa_family !=
542 ((struct sockaddr *)sa2)->sa_family)
545 switch (((struct sockaddr *)sa1)->sa_family) {
547 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
548 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
552 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
553 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
555 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
556 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
563 return memcmp(p1, p2, len);
567 namematch(struct addrinfo *ai)
569 struct addrinfo *aip;
571 if (nfshost == NULL || nfshost_ai == NULL)
576 while (aip != NULL) {
577 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
588 checkmntlist(char *mntname)
594 if (parsehexfsid(mntname, &fsid) == 0)
595 sfs = getmntentry(NULL, NULL, &fsid, FIND);
597 sfs = getmntentry(NULL, mntname, NULL, FIND);
599 sfs = getmntentry(mntname, NULL, NULL, FIND);
604 mntinfo(struct statfs **mntbuf)
606 static struct statfs *origbuf;
610 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
613 bufsize = (mntsize + 1) * sizeof(struct statfs);
614 if ((origbuf = malloc(bufsize)) == NULL)
616 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
622 * Convert a hexadecimal filesystem ID to an fsid_t.
623 * Returns 0 on success.
626 parsehexfsid(const char *hex, fsid_t *fsid)
631 if (strlen(hex) != sizeof(*fsid) * 2)
634 for (i = 0; i < (int)sizeof(*fsid); i++) {
635 hexbuf[0] = hex[i * 2];
636 hexbuf[1] = hex[i * 2 + 1];
637 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
639 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
645 * xdr routines for mount rpc's
648 xdr_dir(XDR *xdrsp, char *dirp)
651 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
658 (void)fprintf(stderr, "%s\n%s\n",
659 "usage: umount [-fNnv] special ... | node ... | fsid ...",
660 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]");