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;
90 char **typelist = NULL;
91 struct statfs *mntbuf, *sfs;
92 struct addrinfo hints;
95 while ((ch = getopt(argc, argv, "AaF:fh:t:v")) != -1)
109 case 'h': /* -h implies -A. */
114 if (typelist != NULL)
115 err(1, "only one -t option may be specified");
116 typelist = makevfslist(optarg);
128 /* Start disks transferring immediately. */
129 if ((fflag & MNT_FORCE) == 0)
132 if ((argc == 0 && !all) || (argc != 0 && all))
135 /* -h implies "-t nfs" if no -t flag. */
136 if ((nfshost != NULL) && (typelist == NULL))
137 typelist = makevfslist("nfs");
139 if (nfshost != NULL) {
140 memset(&hints, 0, sizeof hints);
141 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
143 errx(1, "%s: %s", nfshost, gai_strerror(error));
148 if ((mntsize = mntinfo(&mntbuf)) <= 0)
151 * We unmount the nfs-mounts in the reverse order
152 * that they were mounted.
154 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
155 sfs = &mntbuf[mntsize];
156 if (checkvfsname(sfs->f_fstypename, typelist))
158 if (strcmp(sfs->f_mntonname, "/dev") == 0)
160 if (umountfs(sfs) != 0)
167 err(1, "%s", getfstab());
168 errs = umountall(typelist);
171 for (errs = 0; *argv != NULL; ++argv)
172 if (checkname(*argv, typelist) != 0)
180 umountall(char **typelist)
186 static int firstcall = 1;
188 if ((fs = getfsent()) != NULL)
191 errx(1, "fstab reading failure");
195 /* Ignore the root. */
196 if (strcmp(fs->fs_file, "/") == 0)
200 * Historic practice: ignore unknown FSTAB_* fields.
202 if (strcmp(fs->fs_type, FSTAB_RW) &&
203 strcmp(fs->fs_type, FSTAB_RO) &&
204 strcmp(fs->fs_type, FSTAB_RQ))
206 /* Ignore unknown file system types. */
207 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
209 if (checkvfsname(fs->fs_vfstype, typelist))
213 * We want to unmount the file systems in the reverse order
214 * that they were mounted. So, we save off the file name
215 * in some allocated memory, and then call recursively.
217 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
218 err(1, "malloc failed");
219 (void)strcpy(cp, fs->fs_file);
220 rval = umountall(typelist);
221 rval = checkname(cp, typelist) || rval;
224 } while ((fs = getfsent()) != NULL);
229 * Do magic checks on mountpoint/device/fsid, and then call unmount(2).
232 checkname(char *mntname, char **typelist)
234 char buf[MAXPATHLEN];
235 struct statfs sfsbuf;
243 * 1. Check if the name exists in the mounttable.
245 sfs = checkmntlist(mntname);
247 * 2. Remove trailing slashes if there are any. After that
248 * we look up the name in the mounttable again.
251 len = strlen(mntname);
252 while (len > 1 && mntname[len - 1] == '/')
253 mntname[--len] = '\0';
254 sfs = checkmntlist(mntname);
257 * 3. Check if the deprecated NFS syntax with an '@' has been used
258 * and translate it to the ':' syntax. Look up the name in the
261 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
262 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
263 (int)(delimp - mntname), mntname);
265 while (len > 1 && buf[len - 1] == '/')
267 sfs = checkmntlist(buf);
270 * 4. Resort to a statfs(2) call. This is the last check so that
271 * hung NFS filesystems for example can be unmounted without
272 * potentially blocking forever in statfs() as long as the
273 * filesystem is specified unambiguously. This covers all the
274 * hard cases such as symlinks and mismatches between the
275 * mount list and reality.
276 * We also do this if an ambiguous mount point was specified.
278 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
279 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
280 if (statfs(mntname, &sfsbuf) != 0) {
281 warn("%s: statfs", mntname);
282 } else if (stat(mntname, &sb) != 0) {
283 warn("%s: stat", mntname);
284 } else if (S_ISDIR(sb.st_mode)) {
285 /* Check that `mntname' is the root directory. */
287 snprintf(buf, sizeof(buf), "%s/..", mntname);
288 if (stat(buf, &sb) != 0) {
289 warn("%s: stat", buf);
290 } else if (sb.st_dev == dev) {
291 warnx("%s: not a file system root directory",
299 warnx("%s: unknown file system", mntname);
302 if (checkvfsname(sfs->f_fstypename, typelist))
304 return (umountfs(sfs));
308 * NFS stuff and unmount(2) call
311 umountfs(struct statfs *sfs)
314 enum clnt_stat clnt_stat;
316 struct addrinfo *ai, hints;
319 char *nfsdirname, *orignfsdirname;
320 char *hostp, *delimp;
322 struct nfscl_dumpmntopts dumpmntopts;
323 const char *proto_ptr = NULL;
328 nfsdirname = delimp = orignfsdirname = NULL;
329 memset(&hints, 0, sizeof hints);
331 if (strcmp(sfs->f_fstypename, "nfs") == 0) {
332 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
334 orignfsdirname = nfsdirname;
335 if (*nfsdirname == '[' &&
336 (delimp = strchr(nfsdirname + 1, ']')) != NULL &&
337 *(delimp + 1) == ':') {
338 hostp = nfsdirname + 1;
339 nfsdirname = delimp + 2;
340 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
342 nfsdirname = delimp + 1;
346 getaddrinfo(hostp, NULL, &hints, &ai);
348 warnx("can't get net id for host");
353 * Check if we have to start the rpc-call later.
354 * If there are still identical nfs-names mounted,
355 * we skip the rpc-call. Obviously this has to
356 * happen before unmount(2), but it should happen
357 * after the previous namecheck.
358 * A non-NULL return means that this is the last
359 * mount from mntfromname that is still mounted.
361 if (getmntentry(sfs->f_mntfromname, NULL, NULL,
362 CHECKUNIQUE) != NULL) {
366 * Try and find out whether this NFS mount is NFSv4 and
367 * what protocol is being used. If this fails, the
368 * default is NFSv2,3 and use UDP for the Unmount RPC.
370 dumpmntopts.ndmnt_fname = sfs->f_mntonname;
371 dumpmntopts.ndmnt_buf = buf;
372 dumpmntopts.ndmnt_blen = sizeof(buf);
373 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
374 if (strstr(buf, "nfsv4,") != NULL)
376 else if (strstr(buf, ",tcp,") != NULL)
382 if (!namematch(ai)) {
383 free(orignfsdirname);
386 /* First try to unmount using the file system ID. */
387 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
389 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
390 /* XXX, non-root users get a zero fsid, so don't warn. */
391 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
392 sfs->f_fsid.val[1] != 0)
393 warn("unmount of %s failed", sfs->f_mntonname);
394 if (errno != ENOENT) {
395 free(orignfsdirname);
398 /* Compatibility for old kernels. */
399 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
400 warnx("retrying using path instead of file system ID");
401 if (unmount(sfs->f_mntonname, fflag) != 0) {
402 warn("unmount of %s failed", sfs->f_mntonname);
403 free(orignfsdirname);
407 /* Mark this this file system as unmounted. */
408 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
410 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
413 * Report to mountd-server which nfsname
414 * has been unmounted.
416 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
417 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
419 warnx("%s: %s", hostp,
420 clnt_spcreateerror("MOUNTPROG"));
421 free(orignfsdirname);
424 clp->cl_auth = authsys_create_default();
427 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
428 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
429 if (clnt_stat != RPC_SUCCESS) {
430 warnx("%s: %s", hostp,
431 clnt_sperror(clp, "RPCMNT_UMOUNT"));
432 free(orignfsdirname);
436 * Remove the unmounted entry from /var/db/mounttab.
439 clean_mtab(hostp, nfsdirname, vflag);
440 if(!write_mtab(vflag))
441 warnx("cannot remove mounttab entry %s:%s",
445 auth_destroy(clp->cl_auth);
448 free(orignfsdirname);
453 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
455 static struct statfs *mntbuf;
456 static size_t mntsize = 0;
457 static char *mntcheck = NULL;
458 struct statfs *sfs, *foundsfs;
462 if ((mntsize = mntinfo(&mntbuf)) <= 0)
465 if (mntcheck == NULL) {
466 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
470 * We want to get the file systems in the reverse order
471 * that they were mounted. Unmounted file systems are marked
472 * in a table called 'mntcheck'.
476 for (i = mntsize - 1; i >= 0; i--) {
480 if (fromname != NULL && strcmp(sfs->f_mntfromname,
483 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
485 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
503 if (what == CHECKUNIQUE && count == 1)
509 sacmp(void *sa1, void *sa2)
514 if (((struct sockaddr *)sa1)->sa_family !=
515 ((struct sockaddr *)sa2)->sa_family)
518 switch (((struct sockaddr *)sa1)->sa_family) {
520 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
521 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
525 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
526 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
528 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
529 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
536 return memcmp(p1, p2, len);
540 namematch(struct addrinfo *ai)
542 struct addrinfo *aip;
544 if (nfshost == NULL || nfshost_ai == NULL)
549 while (aip != NULL) {
550 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
561 checkmntlist(char *mntname)
567 if (parsehexfsid(mntname, &fsid) == 0)
568 sfs = getmntentry(NULL, NULL, &fsid, FIND);
570 sfs = getmntentry(NULL, mntname, NULL, FIND);
572 sfs = getmntentry(mntname, NULL, NULL, FIND);
577 mntinfo(struct statfs **mntbuf)
579 static struct statfs *origbuf;
583 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
586 bufsize = (mntsize + 1) * sizeof(struct statfs);
587 if ((origbuf = malloc(bufsize)) == NULL)
589 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
595 * Convert a hexadecimal filesystem ID to an fsid_t.
596 * Returns 0 on success.
599 parsehexfsid(const char *hex, fsid_t *fsid)
604 if (strlen(hex) != sizeof(*fsid) * 2)
607 for (i = 0; i < (int)sizeof(*fsid); i++) {
608 hexbuf[0] = hex[i * 2];
609 hexbuf[1] = hex[i * 2 + 1];
610 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
612 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
618 * xdr routines for mount rpc's
621 xdr_dir(XDR *xdrsp, char *dirp)
624 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
631 (void)fprintf(stderr, "%s\n%s\n",
632 "usage: umount [-fv] special ... | node ... | fsid ...",
633 " umount -a | -A [-F fstab] [-fv] [-h host] [-t type]");