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 static struct addrinfo *nfshost_ai = NULL;
67 static int fflag, vflag;
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:nt:v")) != -1)
108 case 'h': /* -h implies -A. */
113 fflag |= MNT_NONBUSY;
116 if (typelist != NULL)
117 err(1, "only one -t option may be specified");
118 typelist = makevfslist(optarg);
130 if ((fflag & MNT_FORCE) != 0 && (fflag & MNT_NONBUSY) != 0)
131 err(1, "-f and -n are mutually exclusive");
133 /* Start disks transferring immediately. */
134 if ((fflag & (MNT_FORCE | MNT_NONBUSY)) == 0)
137 if ((argc == 0 && !all) || (argc != 0 && all))
140 /* -h implies "-t nfs" if no -t flag. */
141 if ((nfshost != NULL) && (typelist == NULL))
142 typelist = makevfslist("nfs");
144 if (nfshost != NULL) {
145 memset(&hints, 0, sizeof hints);
146 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
148 errx(1, "%s: %s", nfshost, gai_strerror(error));
153 if ((mntsize = mntinfo(&mntbuf)) <= 0)
156 * We unmount the nfs-mounts in the reverse order
157 * that they were mounted.
159 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
160 sfs = &mntbuf[mntsize];
161 if (checkvfsname(sfs->f_fstypename, typelist))
163 if (strcmp(sfs->f_mntonname, "/dev") == 0)
165 if (umountfs(sfs) != 0)
172 err(1, "%s", getfstab());
173 errs = umountall(typelist);
176 for (errs = 0; *argv != NULL; ++argv)
177 if (checkname(*argv, typelist) != 0)
185 umountall(char **typelist)
191 static int firstcall = 1;
193 if ((fs = getfsent()) != NULL)
196 errx(1, "fstab reading failure");
200 /* Ignore the root. */
201 if (strcmp(fs->fs_file, "/") == 0)
205 * Historic practice: ignore unknown FSTAB_* fields.
207 if (strcmp(fs->fs_type, FSTAB_RW) &&
208 strcmp(fs->fs_type, FSTAB_RO) &&
209 strcmp(fs->fs_type, FSTAB_RQ))
211 /* Ignore unknown file system types. */
212 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
214 if (checkvfsname(fs->fs_vfstype, typelist))
218 * We want to unmount the file systems in the reverse order
219 * that they were mounted. So, we save off the file name
220 * in some allocated memory, and then call recursively.
222 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
223 err(1, "malloc failed");
224 (void)strcpy(cp, fs->fs_file);
225 rval = umountall(typelist);
226 rval = checkname(cp, typelist) || rval;
229 } while ((fs = getfsent()) != NULL);
234 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
237 checkname(char *mntname, char **typelist)
239 char buf[MAXPATHLEN];
240 struct statfs sfsbuf;
248 * 1. Check if the name exists in the mounttable.
250 sfs = checkmntlist(mntname);
252 * 2. Remove trailing slashes if there are any. After that
253 * we look up the name in the mounttable again.
256 len = strlen(mntname);
257 while (len > 1 && mntname[len - 1] == '/')
258 mntname[--len] = '\0';
259 sfs = checkmntlist(mntname);
262 * 3. Check if the deprecated NFS syntax with an '@' has been used
263 * and translate it to the ':' syntax. Look up the name in the
266 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
267 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
268 (int)(delimp - mntname), mntname);
270 while (len > 1 && buf[len - 1] == '/')
272 sfs = checkmntlist(buf);
275 * 4. Resort to a statfs(2) call. This is the last check so that
276 * hung NFS filesystems for example can be unmounted without
277 * potentially blocking forever in statfs() as long as the
278 * filesystem is specified unambiguously. This covers all the
279 * hard cases such as symlinks and mismatches between the
280 * mount list and reality.
281 * We also do this if an ambiguous mount point was specified.
283 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
284 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
285 if (statfs(mntname, &sfsbuf) != 0) {
286 warn("%s: statfs", mntname);
287 } else if (stat(mntname, &sb) != 0) {
288 warn("%s: stat", mntname);
289 } else if (S_ISDIR(sb.st_mode)) {
290 /* Check that `mntname' is the root directory. */
292 snprintf(buf, sizeof(buf), "%s/..", mntname);
293 if (stat(buf, &sb) != 0) {
294 warn("%s: stat", buf);
295 } else if (sb.st_dev == dev) {
296 warnx("%s: not a file system root directory",
304 warnx("%s: unknown file system", mntname);
307 if (checkvfsname(sfs->f_fstypename, typelist))
309 return (umountfs(sfs));
313 * NFS stuff and unmount(2) call
316 umountfs(struct statfs *sfs)
319 enum clnt_stat clnt_stat;
321 struct addrinfo *ai, hints;
324 char *nfsdirname, *orignfsdirname;
325 char *hostp, *delimp;
330 nfsdirname = delimp = orignfsdirname = NULL;
331 memset(&hints, 0, sizeof hints);
333 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
334 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
336 orignfsdirname = nfsdirname;
337 if (*nfsdirname == '[' &&
338 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
339 *(delimp + 1) == ':') {
340 hostp = nfsdirname + 1;
341 nfsdirname = delimp + 2;
342 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
344 nfsdirname = delimp + 1;
348 getaddrinfo(hostp, NULL, &hints, &ai);
350 warnx("can't get net id for host");
355 * Check if we have to start the rpc-call later.
356 * If there are still identical nfs-names mounted,
357 * we skip the rpc-call. Obviously this has to
358 * happen before unmount(2), but it should happen
359 * after the previous namecheck.
360 * A non-NULL return means that this is the last
361 * mount from mntfromname that is still mounted.
363 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
364 CHECKUNIQUE) != NULL)
368 if (!namematch(ai)) {
369 free(orignfsdirname);
372 /* First try to unmount using the file system ID. */
373 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
375 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
376 /* XXX, non-root users get a zero fsid, so don't warn. */
377 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
378 sfs->f_fsid.val[1] != 0)
379 warn("unmount of %s failed", sfs->f_mntonname);
380 if (errno != ENOENT) {
381 free(orignfsdirname);
384 /* Compatibility for old kernels. */
385 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
386 warnx("retrying using path instead of file system ID");
387 if (unmount(sfs->f_mntonname, fflag) != 0) {
388 warn("unmount of %s failed", sfs->f_mntonname);
389 free(orignfsdirname);
393 /* Mark this this file system as unmounted. */
394 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
396 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
399 * Report to mountd-server which nfsname
400 * has been unmounted.
402 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
403 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, "udp");
405 warnx("%s: %s", hostp,
406 clnt_spcreateerror("MOUNTPROG"));
407 free(orignfsdirname);
410 clp->cl_auth = authsys_create_default();
413 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
414 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
415 if (clnt_stat != RPC_SUCCESS) {
416 warnx("%s: %s", hostp,
417 clnt_sperror(clp, "RPCMNT_UMOUNT"));
418 free(orignfsdirname);
422 * Remove the unmounted entry from /var/db/mounttab.
425 clean_mtab(hostp, nfsdirname, vflag);
426 if(!write_mtab(vflag))
427 warnx("cannot remove mounttab entry %s:%s",
431 auth_destroy(clp->cl_auth);
434 free(orignfsdirname);
439 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
441 static struct statfs *mntbuf;
442 static size_t mntsize = 0;
443 static int *mntcheck = NULL;
444 struct statfs *sfs, *foundsfs;
448 if ((mntsize = mntinfo(&mntbuf)) <= 0)
451 if (mntcheck == NULL) {
452 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
456 * We want to get the file systems in the reverse order
457 * that they were mounted. Unmounted file systems are marked
458 * in a table called 'mntcheck'.
462 for (i = mntsize - 1; i >= 0; i--) {
466 if (fromname != NULL && strcmp(sfs->f_mntfromname,
469 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
471 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
489 if (what == CHECKUNIQUE && count == 1)
495 sacmp(void *sa1, void *sa2)
500 if (((struct sockaddr *)sa1)->sa_family !=
501 ((struct sockaddr *)sa2)->sa_family)
504 switch (((struct sockaddr *)sa1)->sa_family) {
506 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
507 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
511 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
512 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
514 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
515 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
522 return memcmp(p1, p2, len);
526 namematch(struct addrinfo *ai)
528 struct addrinfo *aip;
530 if (nfshost == NULL || nfshost_ai == NULL)
535 while (aip != NULL) {
536 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
547 checkmntlist(char *mntname)
553 if (parsehexfsid(mntname, &fsid) == 0)
554 sfs = getmntentry(NULL, NULL, &fsid, FIND);
556 sfs = getmntentry(NULL, mntname, NULL, FIND);
558 sfs = getmntentry(mntname, NULL, NULL, FIND);
563 mntinfo(struct statfs **mntbuf)
565 static struct statfs *origbuf;
569 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
572 bufsize = (mntsize + 1) * sizeof(struct statfs);
573 if ((origbuf = malloc(bufsize)) == NULL)
575 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
581 * Convert a hexadecimal filesystem ID to an fsid_t.
582 * Returns 0 on success.
585 parsehexfsid(const char *hex, fsid_t *fsid)
590 if (strlen(hex) != sizeof(*fsid) * 2)
593 for (i = 0; i < (int)sizeof(*fsid); i++) {
594 hexbuf[0] = hex[i * 2];
595 hexbuf[1] = hex[i * 2 + 1];
596 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
598 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
604 * xdr routines for mount rpc's
607 xdr_dir(XDR *xdrsp, char *dirp)
610 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
617 (void)fprintf(stderr, "%s\n%s\n",
618 "usage: umount [-fnv] special ... | node ... | fsid ...",
619 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]");