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 if ((argc == 0 && !all) || (argc != 0 && all))
142 if (nfsforce != 0 && (argc == 0 || nfshost != NULL || typelist != NULL))
145 /* -h implies "-t nfs" if no -t flag. */
146 if ((nfshost != NULL) && (typelist == NULL))
147 typelist = makevfslist("nfs");
149 if (nfshost != NULL) {
150 memset(&hints, 0, sizeof hints);
151 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
153 errx(1, "%s: %s", nfshost, gai_strerror(error));
158 if ((mntsize = mntinfo(&mntbuf)) <= 0)
161 * We unmount the nfs-mounts in the reverse order
162 * that they were mounted.
164 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
165 sfs = &mntbuf[mntsize];
166 if (checkvfsname(sfs->f_fstypename, typelist))
168 if (strcmp(sfs->f_mntonname, "/dev") == 0)
170 if (umountfs(sfs) != 0)
177 err(1, "%s", getfstab());
178 errs = umountall(typelist);
181 for (errs = 0; *argv != NULL; ++argv)
184 * First do the nfssvc() syscall to shut down
185 * the mount point and then do the forced
188 ret = nfssvc(NFSSVC_FORCEDISM, *argv);
190 ret = unmount(*argv, MNT_FORCE);
195 } else if (checkname(*argv, typelist) != 0)
203 umountall(char **typelist)
209 static int firstcall = 1;
211 if ((fs = getfsent()) != NULL)
214 errx(1, "fstab reading failure");
218 /* Ignore the root. */
219 if (strcmp(fs->fs_file, "/") == 0)
223 * Historic practice: ignore unknown FSTAB_* fields.
225 if (strcmp(fs->fs_type, FSTAB_RW) &&
226 strcmp(fs->fs_type, FSTAB_RO) &&
227 strcmp(fs->fs_type, FSTAB_RQ))
229 /* Ignore unknown file system types. */
230 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
232 if (checkvfsname(fs->fs_vfstype, typelist))
236 * We want to unmount the file systems in the reverse order
237 * that they were mounted. So, we save off the file name
238 * in some allocated memory, and then call recursively.
240 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
241 err(1, "malloc failed");
242 (void)strcpy(cp, fs->fs_file);
243 rval = umountall(typelist);
244 rval = checkname(cp, typelist) || rval;
247 } while ((fs = getfsent()) != NULL);
252 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
255 checkname(char *mntname, char **typelist)
257 char buf[MAXPATHLEN];
258 struct statfs sfsbuf;
266 * 1. Check if the name exists in the mounttable.
268 sfs = checkmntlist(mntname);
270 * 2. Remove trailing slashes if there are any. After that
271 * we look up the name in the mounttable again.
274 len = strlen(mntname);
275 while (len > 1 && mntname[len - 1] == '/')
276 mntname[--len] = '\0';
277 sfs = checkmntlist(mntname);
280 * 3. Check if the deprecated NFS syntax with an '@' has been used
281 * and translate it to the ':' syntax. Look up the name in the
284 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
285 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
286 (int)(delimp - mntname), mntname);
288 while (len > 1 && buf[len - 1] == '/')
290 sfs = checkmntlist(buf);
293 * 4. Resort to a statfs(2) call. This is the last check so that
294 * hung NFS filesystems for example can be unmounted without
295 * potentially blocking forever in statfs() as long as the
296 * filesystem is specified unambiguously. This covers all the
297 * hard cases such as symlinks and mismatches between the
298 * mount list and reality.
299 * We also do this if an ambiguous mount point was specified.
301 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
302 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
303 if (statfs(mntname, &sfsbuf) != 0) {
304 warn("%s: statfs", mntname);
305 } else if (stat(mntname, &sb) != 0) {
306 warn("%s: stat", mntname);
307 } else if (S_ISDIR(sb.st_mode)) {
308 /* Check that `mntname' is the root directory. */
310 snprintf(buf, sizeof(buf), "%s/..", mntname);
311 if (stat(buf, &sb) != 0) {
312 warn("%s: stat", buf);
313 } else if (sb.st_dev == dev) {
314 warnx("%s: not a file system root directory",
322 warnx("%s: unknown file system", mntname);
325 if (checkvfsname(sfs->f_fstypename, typelist))
327 return (umountfs(sfs));
331 * NFS stuff and unmount(2) call
334 umountfs(struct statfs *sfs)
337 enum clnt_stat clnt_stat;
339 struct addrinfo *ai, hints;
342 char *nfsdirname, *orignfsdirname;
343 char *hostp, *delimp;
345 struct nfscl_dumpmntopts dumpmntopts;
346 const char *proto_ptr = NULL;
351 nfsdirname = delimp = orignfsdirname = NULL;
352 memset(&hints, 0, sizeof hints);
354 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
355 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
357 orignfsdirname = nfsdirname;
358 if (*nfsdirname == '[' &&
359 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
360 *(delimp + 1) == ':') {
361 hostp = nfsdirname + 1;
362 nfsdirname = delimp + 2;
363 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
365 nfsdirname = delimp + 1;
369 getaddrinfo(hostp, NULL, &hints, &ai);
371 warnx("can't get net id for host");
376 * Check if we have to start the rpc-call later.
377 * If there are still identical nfs-names mounted,
378 * we skip the rpc-call. Obviously this has to
379 * happen before unmount(2), but it should happen
380 * after the previous namecheck.
381 * A non-NULL return means that this is the last
382 * mount from mntfromname that is still mounted.
384 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
385 CHECKUNIQUE) != NULL) {
389 * Try and find out whether this NFS mount is NFSv4 and
390 * what protocol is being used. If this fails, the
391 * default is NFSv2,3 and use UDP for the Unmount RPC.
393 dumpmntopts.ndmnt_fname = sfs->f_mntonname;
394 dumpmntopts.ndmnt_buf = buf;
395 dumpmntopts.ndmnt_blen = sizeof(buf);
396 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
397 if (strstr(buf, "nfsv4,") != NULL)
399 else if (strstr(buf, ",tcp,") != NULL)
405 if (!namematch(ai)) {
406 free(orignfsdirname);
409 /* First try to unmount using the file system ID. */
410 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
412 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
413 /* XXX, non-root users get a zero fsid, so don't warn. */
414 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
415 sfs->f_fsid.val[1] != 0)
416 warn("unmount of %s failed", sfs->f_mntonname);
417 if (errno != ENOENT) {
418 free(orignfsdirname);
421 /* Compatibility for old kernels. */
422 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
423 warnx("retrying using path instead of file system ID");
424 if (unmount(sfs->f_mntonname, fflag) != 0) {
425 warn("unmount of %s failed", sfs->f_mntonname);
426 free(orignfsdirname);
430 /* Mark this this file system as unmounted. */
431 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
433 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
436 * Report to mountd-server which nfsname
437 * has been unmounted.
439 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
440 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
442 warnx("%s: %s", hostp,
443 clnt_spcreateerror("MOUNTPROG"));
444 free(orignfsdirname);
447 clp->cl_auth = authsys_create_default();
450 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
451 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
452 if (clnt_stat != RPC_SUCCESS) {
453 warnx("%s: %s", hostp,
454 clnt_sperror(clp, "RPCMNT_UMOUNT"));
455 free(orignfsdirname);
459 * Remove the unmounted entry from /var/db/mounttab.
462 clean_mtab(hostp, nfsdirname, vflag);
463 if(!write_mtab(vflag))
464 warnx("cannot remove mounttab entry %s:%s",
468 auth_destroy(clp->cl_auth);
471 free(orignfsdirname);
476 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
478 static struct statfs *mntbuf;
479 static size_t mntsize = 0;
480 static int *mntcheck = NULL;
481 struct statfs *sfs, *foundsfs;
485 if ((mntsize = mntinfo(&mntbuf)) <= 0)
488 if (mntcheck == NULL) {
489 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
493 * We want to get the file systems in the reverse order
494 * that they were mounted. Unmounted file systems are marked
495 * in a table called 'mntcheck'.
499 for (i = mntsize - 1; i >= 0; i--) {
503 if (fromname != NULL && strcmp(sfs->f_mntfromname,
506 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
508 if (fsid != NULL && fsidcmp(&sfs->f_fsid, fsid) != 0)
525 if (what == CHECKUNIQUE && count == 1)
531 sacmp(void *sa1, void *sa2)
536 if (((struct sockaddr *)sa1)->sa_family !=
537 ((struct sockaddr *)sa2)->sa_family)
540 switch (((struct sockaddr *)sa1)->sa_family) {
542 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
543 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
547 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
548 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
550 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
551 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
558 return memcmp(p1, p2, len);
562 namematch(struct addrinfo *ai)
564 struct addrinfo *aip;
566 if (nfshost == NULL || nfshost_ai == NULL)
571 while (aip != NULL) {
572 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
583 checkmntlist(char *mntname)
589 if (parsehexfsid(mntname, &fsid) == 0)
590 sfs = getmntentry(NULL, NULL, &fsid, FIND);
592 sfs = getmntentry(NULL, mntname, NULL, FIND);
594 sfs = getmntentry(mntname, NULL, NULL, FIND);
599 mntinfo(struct statfs **mntbuf)
601 static struct statfs *origbuf;
605 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
608 bufsize = (mntsize + 1) * sizeof(struct statfs);
609 if ((origbuf = malloc(bufsize)) == NULL)
611 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
617 * Convert a hexadecimal filesystem ID to an fsid_t.
618 * Returns 0 on success.
621 parsehexfsid(const char *hex, fsid_t *fsid)
626 if (strlen(hex) != sizeof(*fsid) * 2)
629 for (i = 0; i < (int)sizeof(*fsid); i++) {
630 hexbuf[0] = hex[i * 2];
631 hexbuf[1] = hex[i * 2 + 1];
632 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
634 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
640 * xdr routines for mount rpc's
643 xdr_dir(XDR *xdrsp, char *dirp)
646 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
653 (void)fprintf(stderr, "%s\n%s\n",
654 "usage: umount [-fNnv] special ... | node ... | fsid ...",
655 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]");