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>
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, nfsforce, ret;
90 char **typelist = NULL;
91 struct statfs *mntbuf, *sfs;
92 struct addrinfo hints;
94 nfsforce = all = errs = 0;
95 while ((ch = getopt(argc, argv, "AaF:fh:Nnt:v")) != -1)
109 case 'h': /* -h implies -A. */
117 fflag |= MNT_NONBUSY;
120 if (typelist != NULL)
121 err(1, "only one -t option may be specified");
122 typelist = makevfslist(optarg);
134 if ((fflag & MNT_FORCE) != 0 && (fflag & MNT_NONBUSY) != 0)
135 err(1, "-f and -n are mutually exclusive");
137 /* Start disks transferring immediately. */
138 if ((fflag & (MNT_FORCE | MNT_NONBUSY)) == 0 && nfsforce == 0)
141 if ((argc == 0 && !all) || (argc != 0 && all))
144 if (nfsforce != 0 && (argc == 0 || nfshost != NULL || typelist != NULL))
147 /* -h implies "-t nfs" if no -t flag. */
148 if ((nfshost != NULL) && (typelist == NULL))
149 typelist = makevfslist("nfs");
151 if (nfshost != NULL) {
152 memset(&hints, 0, sizeof hints);
153 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
155 errx(1, "%s: %s", nfshost, gai_strerror(error));
160 if ((mntsize = mntinfo(&mntbuf)) <= 0)
163 * We unmount the nfs-mounts in the reverse order
164 * that they were mounted.
166 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
167 sfs = &mntbuf[mntsize];
168 if (checkvfsname(sfs->f_fstypename, typelist))
170 if (strcmp(sfs->f_mntonname, "/dev") == 0)
172 if (umountfs(sfs) != 0)
179 err(1, "%s", getfstab());
180 errs = umountall(typelist);
183 for (errs = 0; *argv != NULL; ++argv)
186 * First do the nfssvc() syscall to shut down
187 * the mount point and then do the forced
190 ret = nfssvc(NFSSVC_FORCEDISM, *argv);
192 ret = unmount(*argv, MNT_FORCE);
197 } else if (checkname(*argv, typelist) != 0)
205 umountall(char **typelist)
211 static int firstcall = 1;
213 if ((fs = getfsent()) != NULL)
216 errx(1, "fstab reading failure");
220 /* Ignore the root. */
221 if (strcmp(fs->fs_file, "/") == 0)
225 * Historic practice: ignore unknown FSTAB_* fields.
227 if (strcmp(fs->fs_type, FSTAB_RW) &&
228 strcmp(fs->fs_type, FSTAB_RO) &&
229 strcmp(fs->fs_type, FSTAB_RQ))
231 /* Ignore unknown file system types. */
232 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
234 if (checkvfsname(fs->fs_vfstype, typelist))
238 * We want to unmount the file systems in the reverse order
239 * that they were mounted. So, we save off the file name
240 * in some allocated memory, and then call recursively.
242 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
243 err(1, "malloc failed");
244 (void)strcpy(cp, fs->fs_file);
245 rval = umountall(typelist);
246 rval = checkname(cp, typelist) || rval;
249 } while ((fs = getfsent()) != NULL);
254 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
257 checkname(char *mntname, char **typelist)
259 char buf[MAXPATHLEN];
260 struct statfs sfsbuf;
268 * 1. Check if the name exists in the mounttable.
270 sfs = checkmntlist(mntname);
272 * 2. Remove trailing slashes if there are any. After that
273 * we look up the name in the mounttable again.
276 len = strlen(mntname);
277 while (len > 1 && mntname[len - 1] == '/')
278 mntname[--len] = '\0';
279 sfs = checkmntlist(mntname);
282 * 3. Check if the deprecated NFS syntax with an '@' has been used
283 * and translate it to the ':' syntax. Look up the name in the
286 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
287 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
288 (int)(delimp - mntname), mntname);
290 while (len > 1 && buf[len - 1] == '/')
292 sfs = checkmntlist(buf);
295 * 4. Resort to a statfs(2) call. This is the last check so that
296 * hung NFS filesystems for example can be unmounted without
297 * potentially blocking forever in statfs() as long as the
298 * filesystem is specified unambiguously. This covers all the
299 * hard cases such as symlinks and mismatches between the
300 * mount list and reality.
301 * We also do this if an ambiguous mount point was specified.
303 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
304 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
305 if (statfs(mntname, &sfsbuf) != 0) {
306 warn("%s: statfs", mntname);
307 } else if (stat(mntname, &sb) != 0) {
308 warn("%s: stat", mntname);
309 } else if (S_ISDIR(sb.st_mode)) {
310 /* Check that `mntname' is the root directory. */
312 snprintf(buf, sizeof(buf), "%s/..", mntname);
313 if (stat(buf, &sb) != 0) {
314 warn("%s: stat", buf);
315 } else if (sb.st_dev == dev) {
316 warnx("%s: not a file system root directory",
324 warnx("%s: unknown file system", mntname);
327 if (checkvfsname(sfs->f_fstypename, typelist))
329 return (umountfs(sfs));
333 * NFS stuff and unmount(2) call
336 umountfs(struct statfs *sfs)
339 enum clnt_stat clnt_stat;
341 struct addrinfo *ai, hints;
344 char *nfsdirname, *orignfsdirname;
345 char *hostp, *delimp;
347 struct nfscl_dumpmntopts dumpmntopts;
348 const char *proto_ptr = NULL;
353 nfsdirname = delimp = orignfsdirname = NULL;
354 memset(&hints, 0, sizeof hints);
356 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
357 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
359 orignfsdirname = nfsdirname;
360 if (*nfsdirname == '[' &&
361 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
362 *(delimp + 1) == ':') {
363 hostp = nfsdirname + 1;
364 nfsdirname = delimp + 2;
365 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
367 nfsdirname = delimp + 1;
371 getaddrinfo(hostp, NULL, &hints, &ai);
373 warnx("can't get net id for host");
378 * Check if we have to start the rpc-call later.
379 * If there are still identical nfs-names mounted,
380 * we skip the rpc-call. Obviously this has to
381 * happen before unmount(2), but it should happen
382 * after the previous namecheck.
383 * A non-NULL return means that this is the last
384 * mount from mntfromname that is still mounted.
386 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
387 CHECKUNIQUE) != NULL) {
391 * Try and find out whether this NFS mount is NFSv4 and
392 * what protocol is being used. If this fails, the
393 * default is NFSv2,3 and use UDP for the Unmount RPC.
395 dumpmntopts.ndmnt_fname = sfs->f_mntonname;
396 dumpmntopts.ndmnt_buf = buf;
397 dumpmntopts.ndmnt_blen = sizeof(buf);
398 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
399 if (strstr(buf, "nfsv4,") != NULL)
401 else if (strstr(buf, ",tcp,") != NULL)
407 if (!namematch(ai)) {
408 free(orignfsdirname);
411 /* First try to unmount using the file system ID. */
412 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
414 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
415 /* XXX, non-root users get a zero fsid, so don't warn. */
416 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
417 sfs->f_fsid.val[1] != 0)
418 warn("unmount of %s failed", sfs->f_mntonname);
419 if (errno != ENOENT) {
420 free(orignfsdirname);
423 /* Compatibility for old kernels. */
424 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
425 warnx("retrying using path instead of file system ID");
426 if (unmount(sfs->f_mntonname, fflag) != 0) {
427 warn("unmount of %s failed", sfs->f_mntonname);
428 free(orignfsdirname);
432 /* Mark this this file system as unmounted. */
433 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
435 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
438 * Report to mountd-server which nfsname
439 * has been unmounted.
441 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
442 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
444 warnx("%s: %s", hostp,
445 clnt_spcreateerror("MOUNTPROG"));
446 free(orignfsdirname);
449 clp->cl_auth = authsys_create_default();
452 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
453 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
454 if (clnt_stat != RPC_SUCCESS) {
455 warnx("%s: %s", hostp,
456 clnt_sperror(clp, "RPCMNT_UMOUNT"));
457 free(orignfsdirname);
461 * Remove the unmounted entry from /var/db/mounttab.
464 clean_mtab(hostp, nfsdirname, vflag);
465 if(!write_mtab(vflag))
466 warnx("cannot remove mounttab entry %s:%s",
470 auth_destroy(clp->cl_auth);
473 free(orignfsdirname);
478 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
480 static struct statfs *mntbuf;
481 static size_t mntsize = 0;
482 static int *mntcheck = NULL;
483 struct statfs *sfs, *foundsfs;
487 if ((mntsize = mntinfo(&mntbuf)) <= 0)
490 if (mntcheck == NULL) {
491 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
495 * We want to get the file systems in the reverse order
496 * that they were mounted. Unmounted file systems are marked
497 * in a table called 'mntcheck'.
501 for (i = mntsize - 1; i >= 0; i--) {
505 if (fromname != NULL && strcmp(sfs->f_mntfromname,
508 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
510 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
528 if (what == CHECKUNIQUE && count == 1)
534 sacmp(void *sa1, void *sa2)
539 if (((struct sockaddr *)sa1)->sa_family !=
540 ((struct sockaddr *)sa2)->sa_family)
543 switch (((struct sockaddr *)sa1)->sa_family) {
545 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
546 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
550 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
551 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
553 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
554 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
561 return memcmp(p1, p2, len);
565 namematch(struct addrinfo *ai)
567 struct addrinfo *aip;
569 if (nfshost == NULL || nfshost_ai == NULL)
574 while (aip != NULL) {
575 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
586 checkmntlist(char *mntname)
592 if (parsehexfsid(mntname, &fsid) == 0)
593 sfs = getmntentry(NULL, NULL, &fsid, FIND);
595 sfs = getmntentry(NULL, mntname, NULL, FIND);
597 sfs = getmntentry(mntname, NULL, NULL, FIND);
602 mntinfo(struct statfs **mntbuf)
604 static struct statfs *origbuf;
608 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
611 bufsize = (mntsize + 1) * sizeof(struct statfs);
612 if ((origbuf = malloc(bufsize)) == NULL)
614 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
620 * Convert a hexadecimal filesystem ID to an fsid_t.
621 * Returns 0 on success.
624 parsehexfsid(const char *hex, fsid_t *fsid)
629 if (strlen(hex) != sizeof(*fsid) * 2)
632 for (i = 0; i < (int)sizeof(*fsid); i++) {
633 hexbuf[0] = hex[i * 2];
634 hexbuf[1] = hex[i * 2 + 1];
635 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
637 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
643 * xdr routines for mount rpc's
646 xdr_dir(XDR *xdrsp, char *dirp)
649 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
656 (void)fprintf(stderr, "%s\n%s\n",
657 "usage: umount [-fNnv] special ... | node ... | fsid ...",
658 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]");