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;
93 /* Start disks transferring immediately. */
97 while ((ch = getopt(argc, argv, "AaF:fh:t:v")) != -1)
111 case 'h': /* -h implies -A. */
116 if (typelist != NULL)
117 err(1, "only one -t option may be specified");
118 typelist = makevfslist(optarg);
130 if ((argc == 0 && !all) || (argc != 0 && all))
133 /* -h implies "-t nfs" if no -t flag. */
134 if ((nfshost != NULL) && (typelist == NULL))
135 typelist = makevfslist("nfs");
137 if (nfshost != NULL) {
138 memset(&hints, 0, sizeof hints);
139 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
141 errx(1, "%s: %s", nfshost, gai_strerror(error));
146 if ((mntsize = mntinfo(&mntbuf)) <= 0)
149 * We unmount the nfs-mounts in the reverse order
150 * that they were mounted.
152 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
153 sfs = &mntbuf[mntsize];
154 if (checkvfsname(sfs->f_fstypename, typelist))
156 if (umountfs(sfs) != 0)
163 err(1, "%s", getfstab());
164 errs = umountall(typelist);
167 for (errs = 0; *argv != NULL; ++argv)
168 if (checkname(*argv, typelist) != 0)
176 umountall(char **typelist)
182 static int firstcall = 1;
184 if ((fs = getfsent()) != NULL)
187 errx(1, "fstab reading failure");
191 /* Ignore the root. */
192 if (strcmp(fs->fs_file, "/") == 0)
196 * Historic practice: ignore unknown FSTAB_* fields.
198 if (strcmp(fs->fs_type, FSTAB_RW) &&
199 strcmp(fs->fs_type, FSTAB_RO) &&
200 strcmp(fs->fs_type, FSTAB_RQ))
202 /* Ignore unknown file system types. */
203 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
205 if (checkvfsname(fs->fs_vfstype, typelist))
209 * We want to unmount the file systems in the reverse order
210 * that they were mounted. So, we save off the file name
211 * in some allocated memory, and then call recursively.
213 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
214 err(1, "malloc failed");
215 (void)strcpy(cp, fs->fs_file);
216 rval = umountall(typelist);
217 rval = checkname(cp, typelist) || rval;
220 } while ((fs = getfsent()) != NULL);
225 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
228 checkname(char *mntname, char **typelist)
230 char buf[MAXPATHLEN];
231 struct statfs sfsbuf;
239 * 1. Check if the name exists in the mounttable.
241 sfs = checkmntlist(mntname);
243 * 2. Remove trailing slashes if there are any. After that
244 * we look up the name in the mounttable again.
247 len = strlen(mntname);
248 while (len > 1 && mntname[len - 1] == '/')
249 mntname[--len] = '\0';
250 sfs = checkmntlist(mntname);
253 * 3. Check if the deprecated NFS syntax with an '@' has been used
254 * and translate it to the ':' syntax. Look up the name in the
257 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
258 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
259 (int)(delimp - mntname), mntname);
261 while (len > 1 && buf[len - 1] == '/')
263 sfs = checkmntlist(buf);
266 * 4. Resort to a statfs(2) call. This is the last check so that
267 * hung NFS filesystems for example can be unmounted without
268 * potentially blocking forever in statfs() as long as the
269 * filesystem is specified unambiguously. This covers all the
270 * hard cases such as symlinks and mismatches between the
271 * mount list and reality.
272 * We also do this if an ambiguous mount point was specified.
274 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
275 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
276 if (statfs(mntname, &sfsbuf) != 0) {
277 warn("%s: statfs", mntname);
278 } else if (stat(mntname, &sb) != 0) {
279 warn("%s: stat", mntname);
280 } else if (S_ISDIR(sb.st_mode)) {
281 /* Check that `mntname' is the root directory. */
283 snprintf(buf, sizeof(buf), "%s/..", mntname);
284 if (stat(buf, &sb) != 0) {
285 warn("%s: stat", buf);
286 } else if (sb.st_dev == dev) {
287 warnx("%s: not a file system root directory",
295 warnx("%s: unknown file system", mntname);
298 if (checkvfsname(sfs->f_fstypename, typelist))
300 return (umountfs(sfs));
304 * NFS stuff and unmount(2) call
307 umountfs(struct statfs *sfs)
310 enum clnt_stat clnt_stat;
312 struct addrinfo *ai, hints;
315 char *nfsdirname, *orignfsdirname;
316 char *hostp, *delimp;
321 nfsdirname = delimp = orignfsdirname = NULL;
322 memset(&hints, 0, sizeof hints);
324 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
325 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
327 orignfsdirname = nfsdirname;
328 if (*nfsdirname == '[' &&
329 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
330 *(delimp + 1) == ':') {
331 hostp = nfsdirname + 1;
332 nfsdirname = delimp + 2;
333 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
335 nfsdirname = delimp + 1;
339 getaddrinfo(hostp, NULL, &hints, &ai);
341 warnx("can't get net id for host");
346 * Check if we have to start the rpc-call later.
347 * If there are still identical nfs-names mounted,
348 * we skip the rpc-call. Obviously this has to
349 * happen before unmount(2), but it should happen
350 * after the previous namecheck.
351 * A non-NULL return means that this is the last
352 * mount from mntfromname that is still mounted.
354 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
355 CHECKUNIQUE) != NULL)
361 /* First try to unmount using the file system ID. */
362 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
364 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
365 /* XXX, non-root users get a zero fsid, so don't warn. */
366 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
367 sfs->f_fsid.val[1] != 0)
368 warn("unmount of %s failed", sfs->f_mntonname);
371 /* Compatibility for old kernels. */
372 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
373 warnx("retrying using path instead of file system ID");
374 if (unmount(sfs->f_mntonname, fflag) != 0) {
375 warn("unmount of %s failed", sfs->f_mntonname);
379 /* Mark this this file system as unmounted. */
380 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
382 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
385 * Report to mountd-server which nfsname
386 * has been unmounted.
388 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
389 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS, "udp");
391 warnx("%s: %s", hostp,
392 clnt_spcreateerror("MOUNTPROG"));
395 clp->cl_auth = authsys_create_default();
398 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
399 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
400 if (clnt_stat != RPC_SUCCESS) {
401 warnx("%s: %s", hostp,
402 clnt_sperror(clp, "RPCMNT_UMOUNT"));
406 * Remove the unmounted entry from /var/db/mounttab.
409 clean_mtab(hostp, nfsdirname, vflag);
410 if(!write_mtab(vflag))
411 warnx("cannot remove mounttab entry %s:%s",
415 free(orignfsdirname);
416 auth_destroy(clp->cl_auth);
423 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
425 static struct statfs *mntbuf;
426 static size_t mntsize = 0;
427 static char *mntcheck = NULL;
428 struct statfs *sfs, *foundsfs;
432 if ((mntsize = mntinfo(&mntbuf)) <= 0)
435 if (mntcheck == NULL) {
436 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
440 * We want to get the file systems in the reverse order
441 * that they were mounted. Unmounted file systems are marked
442 * in a table called 'mntcheck'.
446 for (i = mntsize - 1; i >= 0; i--) {
450 if (fromname != NULL && strcmp(sfs->f_mntfromname,
453 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
455 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
473 if (what == CHECKUNIQUE && count == 1)
479 sacmp(void *sa1, void *sa2)
484 if (((struct sockaddr *)sa1)->sa_family !=
485 ((struct sockaddr *)sa2)->sa_family)
488 switch (((struct sockaddr *)sa1)->sa_family) {
490 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
491 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
495 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
496 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
498 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
499 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
506 return memcmp(p1, p2, len);
510 namematch(struct addrinfo *ai)
512 struct addrinfo *aip;
514 if (nfshost == NULL || nfshost_ai == NULL)
519 while (aip != NULL) {
520 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
531 checkmntlist(char *mntname)
537 if (parsehexfsid(mntname, &fsid) == 0)
538 sfs = getmntentry(NULL, NULL, &fsid, FIND);
540 sfs = getmntentry(NULL, mntname, NULL, FIND);
542 sfs = getmntentry(mntname, NULL, NULL, FIND);
547 mntinfo(struct statfs **mntbuf)
549 static struct statfs *origbuf;
553 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
556 bufsize = (mntsize + 1) * sizeof(struct statfs);
557 if ((origbuf = malloc(bufsize)) == NULL)
559 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
565 * Convert a hexadecimal filesystem ID to an fsid_t.
566 * Returns 0 on success.
569 parsehexfsid(const char *hex, fsid_t *fsid)
574 if (strlen(hex) != sizeof(*fsid) * 2)
577 for (i = 0; i < (int)sizeof(*fsid); i++) {
578 hexbuf[0] = hex[i * 2];
579 hexbuf[1] = hex[i * 2 + 1];
580 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
582 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
588 * xdr routines for mount rpc's
591 xdr_dir(XDR *xdrsp, char *dirp)
594 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
601 (void)fprintf(stderr, "%s\n%s\n",
602 "usage: umount [-fv] special ... | node ... | fsid ...",
603 " umount -a | -A [-F fstab] [-fv] [-h host] [-t type]");