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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 static const char copyright[] =
32 "@(#) Copyright (c) 1980, 1989, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
38 static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95";
40 static const char rcsid[] =
44 #include <sys/param.h>
45 #include <sys/mount.h>
46 #include <sys/socket.h>
51 #include <rpcsvc/mount.h>
64 typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat;
66 struct addrinfo *nfshost_ai = NULL;
70 struct statfs *checkmntlist(char *);
71 int checkvfsname (const char *, char **);
72 struct statfs *getmntentry(const char *fromname, const char *onname,
73 fsid_t *fsid, dowhat what);
74 char **makevfslist (const char *);
75 size_t mntinfo (struct statfs **);
76 int namematch (struct addrinfo *);
77 int parsehexfsid(const char *hex, fsid_t *fsid);
78 int sacmp (void *, void *);
79 int umountall (char **);
80 int checkname (char *, char **);
81 int umountfs(struct statfs *sfs);
83 int xdr_dir (XDR *, char *);
86 main(int argc, char *argv[])
88 int all, errs, ch, mntsize, error;
89 char **typelist = NULL;
90 struct statfs *mntbuf, *sfs;
91 struct addrinfo hints;
94 while ((ch = getopt(argc, argv, "AaF:fh:t:v")) != -1)
108 case 'h': /* -h implies -A. */
113 if (typelist != NULL)
114 err(1, "only one -t option may be specified");
115 typelist = makevfslist(optarg);
127 /* Start disks transferring immediately. */
128 if ((fflag & MNT_FORCE) == 0)
131 if ((argc == 0 && !all) || (argc != 0 && all))
134 /* -h implies "-t nfs" if no -t flag. */
135 if ((nfshost != NULL) && (typelist == NULL))
136 typelist = makevfslist("nfs");
138 if (nfshost != NULL) {
139 memset(&hints, 0, sizeof hints);
140 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
142 errx(1, "%s: %s", nfshost, gai_strerror(error));
147 if ((mntsize = mntinfo(&mntbuf)) <= 0)
150 * We unmount the nfs-mounts in the reverse order
151 * that they were mounted.
153 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
154 sfs = &mntbuf[mntsize];
155 if (checkvfsname(sfs->f_fstypename, typelist))
157 if (strcmp(sfs->f_mntonname, "/dev") == 0)
159 if (umountfs(sfs) != 0)
166 err(1, "%s", getfstab());
167 errs = umountall(typelist);
170 for (errs = 0; *argv != NULL; ++argv)
171 if (checkname(*argv, typelist) != 0)
179 umountall(char **typelist)
185 static int firstcall = 1;
187 if ((fs = getfsent()) != NULL)
190 errx(1, "fstab reading failure");
194 /* Ignore the root. */
195 if (strcmp(fs->fs_file, "/") == 0)
199 * Historic practice: ignore unknown FSTAB_* fields.
201 if (strcmp(fs->fs_type, FSTAB_RW) &&
202 strcmp(fs->fs_type, FSTAB_RO) &&
203 strcmp(fs->fs_type, FSTAB_RQ))
205 /* Ignore unknown file system types. */
206 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
208 if (checkvfsname(fs->fs_vfstype, typelist))
212 * We want to unmount the file systems in the reverse order
213 * that they were mounted. So, we save off the file name
214 * in some allocated memory, and then call recursively.
216 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
217 err(1, "malloc failed");
218 (void)strcpy(cp, fs->fs_file);
219 rval = umountall(typelist);
220 rval = checkname(cp, typelist) || rval;
223 } while ((fs = getfsent()) != NULL);
228 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
231 checkname(char *mntname, char **typelist)
233 char buf[MAXPATHLEN];
234 struct statfs sfsbuf;
242 * 1. Check if the name exists in the mounttable.
244 sfs = checkmntlist(mntname);
246 * 2. Remove trailing slashes if there are any. After that
247 * we look up the name in the mounttable again.
250 len = strlen(mntname);
251 while (len > 1 && mntname[len - 1] == '/')
252 mntname[--len] = '\0';
253 sfs = checkmntlist(mntname);
256 * 3. Check if the deprecated NFS syntax with an '@' has been used
257 * and translate it to the ':' syntax. Look up the name in the
260 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
261 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
262 (int)(delimp - mntname), mntname);
264 while (len > 1 && buf[len - 1] == '/')
266 sfs = checkmntlist(buf);
269 * 4. Resort to a statfs(2) call. This is the last check so that
270 * hung NFS filesystems for example can be unmounted without
271 * potentially blocking forever in statfs() as long as the
272 * filesystem is specified unambiguously. This covers all the
273 * hard cases such as symlinks and mismatches between the
274 * mount list and reality.
275 * We also do this if an ambiguous mount point was specified.
277 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
278 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
279 if (statfs(mntname, &sfsbuf) != 0) {
280 warn("%s: statfs", mntname);
281 } else if (stat(mntname, &sb) != 0) {
282 warn("%s: stat", mntname);
283 } else if (S_ISDIR(sb.st_mode)) {
284 /* Check that `mntname' is the root directory. */
286 snprintf(buf, sizeof(buf), "%s/..", mntname);
287 if (stat(buf, &sb) != 0) {
288 warn("%s: stat", buf);
289 } else if (sb.st_dev == dev) {
290 warnx("%s: not a file system root directory",
298 warnx("%s: unknown file system", mntname);
301 if (checkvfsname(sfs->f_fstypename, typelist))
303 return (umountfs(sfs));
307 * NFS stuff and unmount(2) call
310 umountfs(struct statfs *sfs)
313 enum clnt_stat clnt_stat;
315 struct addrinfo *ai, hints;
318 char *nfsdirname, *orignfsdirname;
319 char *hostp, *delimp;
324 nfsdirname = delimp = orignfsdirname = NULL;
325 memset(&hints, 0, sizeof hints);
327 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
328 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
330 orignfsdirname = nfsdirname;
331 if (*nfsdirname == '[' &&
332 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
333 *(delimp + 1) == ':') {
334 hostp = nfsdirname + 1;
335 nfsdirname = delimp + 2;
336 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
338 nfsdirname = delimp + 1;
342 getaddrinfo(hostp, NULL, &hints, &ai);
344 warnx("can't get net id for host");
349 * Check if we have to start the rpc-call later.
350 * If there are still identical nfs-names mounted,
351 * we skip the rpc-call. Obviously this has to
352 * happen before unmount(2), but it should happen
353 * after the previous namecheck.
354 * A non-NULL return means that this is the last
355 * mount from mntfromname that is still mounted.
357 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
358 CHECKUNIQUE) != NULL)
362 if (!namematch(ai)) {
363 free(orignfsdirname);
366 /* First try to unmount using the file system ID. */
367 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
369 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
370 /* XXX, non-root users get a zero fsid, so don't warn. */
371 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
372 sfs->f_fsid.val[1] != 0)
373 warn("unmount of %s failed", sfs->f_mntonname);
374 if (errno != ENOENT) {
375 free(orignfsdirname);
378 /* Compatibility for old kernels. */
379 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
380 warnx("retrying using path instead of file system ID");
381 if (unmount(sfs->f_mntonname, fflag) != 0) {
382 warn("unmount of %s failed", sfs->f_mntonname);
383 free(orignfsdirname);
387 /* Mark this this file system as unmounted. */
388 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
390 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
393 * Report to mountd-server which nfsname
394 * has been unmounted.
396 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
397 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS, "udp");
399 warnx("%s: %s", hostp,
400 clnt_spcreateerror("MOUNTPROG"));
401 free(orignfsdirname);
404 clp->cl_auth = authsys_create_default();
407 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
408 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
409 if (clnt_stat != RPC_SUCCESS) {
410 warnx("%s: %s", hostp,
411 clnt_sperror(clp, "RPCMNT_UMOUNT"));
412 free(orignfsdirname);
416 * Remove the unmounted entry from /var/db/mounttab.
419 clean_mtab(hostp, nfsdirname, vflag);
420 if(!write_mtab(vflag))
421 warnx("cannot remove mounttab entry %s:%s",
425 auth_destroy(clp->cl_auth);
428 free(orignfsdirname);
433 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
435 static struct statfs *mntbuf;
436 static size_t mntsize = 0;
437 static char *mntcheck = NULL;
438 struct statfs *sfs, *foundsfs;
442 if ((mntsize = mntinfo(&mntbuf)) <= 0)
445 if (mntcheck == NULL) {
446 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
450 * We want to get the file systems in the reverse order
451 * that they were mounted. Unmounted file systems are marked
452 * in a table called 'mntcheck'.
456 for (i = mntsize - 1; i >= 0; i--) {
460 if (fromname != NULL && strcmp(sfs->f_mntfromname,
463 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
465 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
483 if (what == CHECKUNIQUE && count == 1)
489 sacmp(void *sa1, void *sa2)
494 if (((struct sockaddr *)sa1)->sa_family !=
495 ((struct sockaddr *)sa2)->sa_family)
498 switch (((struct sockaddr *)sa1)->sa_family) {
500 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
501 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
505 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
506 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
508 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
509 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
516 return memcmp(p1, p2, len);
520 namematch(struct addrinfo *ai)
522 struct addrinfo *aip;
524 if (nfshost == NULL || nfshost_ai == NULL)
529 while (aip != NULL) {
530 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
541 checkmntlist(char *mntname)
547 if (parsehexfsid(mntname, &fsid) == 0)
548 sfs = getmntentry(NULL, NULL, &fsid, FIND);
550 sfs = getmntentry(NULL, mntname, NULL, FIND);
552 sfs = getmntentry(mntname, NULL, NULL, FIND);
557 mntinfo(struct statfs **mntbuf)
559 static struct statfs *origbuf;
563 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
566 bufsize = (mntsize + 1) * sizeof(struct statfs);
567 if ((origbuf = malloc(bufsize)) == NULL)
569 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
575 * Convert a hexadecimal filesystem ID to an fsid_t.
576 * Returns 0 on success.
579 parsehexfsid(const char *hex, fsid_t *fsid)
584 if (strlen(hex) != sizeof(*fsid) * 2)
587 for (i = 0; i < (int)sizeof(*fsid); i++) {
588 hexbuf[0] = hex[i * 2];
589 hexbuf[1] = hex[i * 2 + 1];
590 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
592 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
598 * xdr routines for mount rpc's
601 xdr_dir(XDR *xdrsp, char *dirp)
604 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
611 (void)fprintf(stderr, "%s\n%s\n",
612 "usage: umount [-fv] special ... | node ... | fsid ...",
613 " umount -a | -A [-F fstab] [-fv] [-h host] [-t type]");