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 * 3. 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>
52 #include <nfs/nfssvc.h>
65 typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat;
67 static struct addrinfo *nfshost_ai = NULL;
68 static int fflag, vflag;
71 struct statfs *checkmntlist(char *);
72 int checkvfsname (const char *, char **);
73 struct statfs *getmntentry(const char *fromname, const char *onname,
74 fsid_t *fsid, dowhat what);
75 char **makevfslist (const char *);
76 size_t mntinfo (struct statfs **);
77 int namematch (struct addrinfo *);
78 int parsehexfsid(const char *hex, fsid_t *fsid);
79 int sacmp (void *, void *);
80 int umountall (char **);
81 int checkname (char *, char **);
82 int umountfs(struct statfs *sfs);
84 int xdr_dir (XDR *, char *);
87 main(int argc, char *argv[])
89 int all, errs, ch, mntsize, error;
90 char **typelist = NULL;
91 struct statfs *mntbuf, *sfs;
92 struct addrinfo hints;
95 while ((ch = getopt(argc, argv, "AaF:fh:nt:v")) != -1)
109 case 'h': /* -h implies -A. */
114 fflag |= MNT_NONBUSY;
117 if (typelist != NULL)
118 err(1, "only one -t option may be specified");
119 typelist = makevfslist(optarg);
131 if ((fflag & MNT_FORCE) != 0 && (fflag & MNT_NONBUSY) != 0)
132 err(1, "-f and -n are mutually exclusive");
134 /* Start disks transferring immediately. */
135 if ((fflag & (MNT_FORCE | MNT_NONBUSY)) == 0)
138 if ((argc == 0 && !all) || (argc != 0 && all))
141 /* -h implies "-t nfs" if no -t flag. */
142 if ((nfshost != NULL) && (typelist == NULL))
143 typelist = makevfslist("nfs");
145 if (nfshost != NULL) {
146 memset(&hints, 0, sizeof hints);
147 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
149 errx(1, "%s: %s", nfshost, gai_strerror(error));
154 if ((mntsize = mntinfo(&mntbuf)) <= 0)
157 * We unmount the nfs-mounts in the reverse order
158 * that they were mounted.
160 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
161 sfs = &mntbuf[mntsize];
162 if (checkvfsname(sfs->f_fstypename, typelist))
164 if (strcmp(sfs->f_mntonname, "/dev") == 0)
166 if (umountfs(sfs) != 0)
173 err(1, "%s", getfstab());
174 errs = umountall(typelist);
177 for (errs = 0; *argv != NULL; ++argv)
178 if (checkname(*argv, typelist) != 0)
186 umountall(char **typelist)
192 static int firstcall = 1;
194 if ((fs = getfsent()) != NULL)
197 errx(1, "fstab reading failure");
201 /* Ignore the root. */
202 if (strcmp(fs->fs_file, "/") == 0)
206 * Historic practice: ignore unknown FSTAB_* fields.
208 if (strcmp(fs->fs_type, FSTAB_RW) &&
209 strcmp(fs->fs_type, FSTAB_RO) &&
210 strcmp(fs->fs_type, FSTAB_RQ))
212 /* Ignore unknown file system types. */
213 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
215 if (checkvfsname(fs->fs_vfstype, typelist))
219 * We want to unmount the file systems in the reverse order
220 * that they were mounted. So, we save off the file name
221 * in some allocated memory, and then call recursively.
223 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
224 err(1, "malloc failed");
225 (void)strcpy(cp, fs->fs_file);
226 rval = umountall(typelist);
227 rval = checkname(cp, typelist) || rval;
230 } while ((fs = getfsent()) != NULL);
235 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
238 checkname(char *mntname, char **typelist)
240 char buf[MAXPATHLEN];
241 struct statfs sfsbuf;
249 * 1. Check if the name exists in the mounttable.
251 sfs = checkmntlist(mntname);
253 * 2. Remove trailing slashes if there are any. After that
254 * we look up the name in the mounttable again.
257 len = strlen(mntname);
258 while (len > 1 && mntname[len - 1] == '/')
259 mntname[--len] = '\0';
260 sfs = checkmntlist(mntname);
263 * 3. Check if the deprecated NFS syntax with an '@' has been used
264 * and translate it to the ':' syntax. Look up the name in the
267 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
268 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
269 (int)(delimp - mntname), mntname);
271 while (len > 1 && buf[len - 1] == '/')
273 sfs = checkmntlist(buf);
276 * 4. Resort to a statfs(2) call. This is the last check so that
277 * hung NFS filesystems for example can be unmounted without
278 * potentially blocking forever in statfs() as long as the
279 * filesystem is specified unambiguously. This covers all the
280 * hard cases such as symlinks and mismatches between the
281 * mount list and reality.
282 * We also do this if an ambiguous mount point was specified.
284 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
285 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
286 if (statfs(mntname, &sfsbuf) != 0) {
287 warn("%s: statfs", mntname);
288 } else if (stat(mntname, &sb) != 0) {
289 warn("%s: stat", mntname);
290 } else if (S_ISDIR(sb.st_mode)) {
291 /* Check that `mntname' is the root directory. */
293 snprintf(buf, sizeof(buf), "%s/..", mntname);
294 if (stat(buf, &sb) != 0) {
295 warn("%s: stat", buf);
296 } else if (sb.st_dev == dev) {
297 warnx("%s: not a file system root directory",
305 warnx("%s: unknown file system", mntname);
308 if (checkvfsname(sfs->f_fstypename, typelist))
310 return (umountfs(sfs));
314 * NFS stuff and unmount(2) call
317 umountfs(struct statfs *sfs)
320 enum clnt_stat clnt_stat;
322 struct addrinfo *ai, hints;
325 char *nfsdirname, *orignfsdirname;
326 char *hostp, *delimp;
328 struct nfscl_dumpmntopts dumpmntopts;
329 const char *proto_ptr = NULL;
334 nfsdirname = delimp = orignfsdirname = NULL;
335 memset(&hints, 0, sizeof hints);
337 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
338 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
340 orignfsdirname = nfsdirname;
341 if (*nfsdirname == '[' &&
342 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
343 *(delimp + 1) == ':') {
344 hostp = nfsdirname + 1;
345 nfsdirname = delimp + 2;
346 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
348 nfsdirname = delimp + 1;
352 getaddrinfo(hostp, NULL, &hints, &ai);
354 warnx("can't get net id for host");
359 * Check if we have to start the rpc-call later.
360 * If there are still identical nfs-names mounted,
361 * we skip the rpc-call. Obviously this has to
362 * happen before unmount(2), but it should happen
363 * after the previous namecheck.
364 * A non-NULL return means that this is the last
365 * mount from mntfromname that is still mounted.
367 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
368 CHECKUNIQUE) != NULL) {
372 * Try and find out whether this NFS mount is NFSv4 and
373 * what protocol is being used. If this fails, the
374 * default is NFSv2,3 and use UDP for the Unmount RPC.
376 dumpmntopts.ndmnt_fname = sfs->f_mntonname;
377 dumpmntopts.ndmnt_buf = buf;
378 dumpmntopts.ndmnt_blen = sizeof(buf);
379 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
380 if (strstr(buf, "nfsv4,") != NULL)
382 else if (strstr(buf, ",tcp,") != NULL)
388 if (!namematch(ai)) {
389 free(orignfsdirname);
392 /* First try to unmount using the file system ID. */
393 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
395 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
396 /* XXX, non-root users get a zero fsid, so don't warn. */
397 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
398 sfs->f_fsid.val[1] != 0)
399 warn("unmount of %s failed", sfs->f_mntonname);
400 if (errno != ENOENT) {
401 free(orignfsdirname);
404 /* Compatibility for old kernels. */
405 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
406 warnx("retrying using path instead of file system ID");
407 if (unmount(sfs->f_mntonname, fflag) != 0) {
408 warn("unmount of %s failed", sfs->f_mntonname);
409 free(orignfsdirname);
413 /* Mark this this file system as unmounted. */
414 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
416 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
419 * Report to mountd-server which nfsname
420 * has been unmounted.
422 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
423 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
425 warnx("%s: %s", hostp,
426 clnt_spcreateerror("MOUNTPROG"));
427 free(orignfsdirname);
430 clp->cl_auth = authsys_create_default();
433 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
434 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
435 if (clnt_stat != RPC_SUCCESS) {
436 warnx("%s: %s", hostp,
437 clnt_sperror(clp, "RPCMNT_UMOUNT"));
438 free(orignfsdirname);
442 * Remove the unmounted entry from /var/db/mounttab.
445 clean_mtab(hostp, nfsdirname, vflag);
446 if(!write_mtab(vflag))
447 warnx("cannot remove mounttab entry %s:%s",
451 auth_destroy(clp->cl_auth);
454 free(orignfsdirname);
459 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
461 static struct statfs *mntbuf;
462 static size_t mntsize = 0;
463 static int *mntcheck = NULL;
464 struct statfs *sfs, *foundsfs;
468 if ((mntsize = mntinfo(&mntbuf)) <= 0)
471 if (mntcheck == NULL) {
472 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
476 * We want to get the file systems in the reverse order
477 * that they were mounted. Unmounted file systems are marked
478 * in a table called 'mntcheck'.
482 for (i = mntsize - 1; i >= 0; i--) {
486 if (fromname != NULL && strcmp(sfs->f_mntfromname,
489 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
491 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
509 if (what == CHECKUNIQUE && count == 1)
515 sacmp(void *sa1, void *sa2)
520 if (((struct sockaddr *)sa1)->sa_family !=
521 ((struct sockaddr *)sa2)->sa_family)
524 switch (((struct sockaddr *)sa1)->sa_family) {
526 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
527 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
531 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
532 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
534 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
535 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
542 return memcmp(p1, p2, len);
546 namematch(struct addrinfo *ai)
548 struct addrinfo *aip;
550 if (nfshost == NULL || nfshost_ai == NULL)
555 while (aip != NULL) {
556 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
567 checkmntlist(char *mntname)
573 if (parsehexfsid(mntname, &fsid) == 0)
574 sfs = getmntentry(NULL, NULL, &fsid, FIND);
576 sfs = getmntentry(NULL, mntname, NULL, FIND);
578 sfs = getmntentry(mntname, NULL, NULL, FIND);
583 mntinfo(struct statfs **mntbuf)
585 static struct statfs *origbuf;
589 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
592 bufsize = (mntsize + 1) * sizeof(struct statfs);
593 if ((origbuf = malloc(bufsize)) == NULL)
595 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
601 * Convert a hexadecimal filesystem ID to an fsid_t.
602 * Returns 0 on success.
605 parsehexfsid(const char *hex, fsid_t *fsid)
610 if (strlen(hex) != sizeof(*fsid) * 2)
613 for (i = 0; i < (int)sizeof(*fsid); i++) {
614 hexbuf[0] = hex[i * 2];
615 hexbuf[1] = hex[i * 2 + 1];
616 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
618 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
624 * xdr routines for mount rpc's
627 xdr_dir(XDR *xdrsp, char *dirp)
630 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
637 (void)fprintf(stderr, "%s\n%s\n",
638 "usage: umount [-fnv] special ... | node ... | fsid ...",
639 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]");