/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fslib.h" #include #define FS_PATH "/usr/lib/fs" #define ALT_PATH "/etc/fs" #define FULLPATH_MAX 32 #define FSTYPE_MAX 8 #define ARGV_MAX 16 int aflg, oflg, Vflg, dashflg, dflg, fflg; extern void rpterr(), usage(), mnterror(); extern char *optarg; /* used by getopt */ extern int optind, opterr; static char *myname; char fs_path[] = FS_PATH; char alt_path[] = ALT_PATH; char mnttab[MAXPATHLEN + 1]; char *oarg, *farg; int maxrun, nrun; int no_mnttab; int lofscnt; /* presence of lofs prohibits parallel */ /* umounting */ int exitcode; char resolve[MAXPATHLEN]; static char ibuf[BUFSIZ]; /* * Currently, mounting cachefs's simultaneous uncovers various problems. * For the short term, we serialize cachefs activity while we fix * these cachefs bugs. */ #define CACHEFS_BUG #ifdef CACHEFS_BUG #include /* for BACKMNT_NAME */ int cachefs_running; /* parallel cachefs not supported yet */ #endif /* * The basic mount struct that describes an mnttab entry. * It is used both in an array and as a linked list elem. */ typedef struct mountent { struct mnttab ment; /* the mnttab data */ int mlevel; /* mount level of the mount pt */ pid_t pid; /* the pid of this mount process */ #define RDPIPE 0 #define WRPIPE 1 int sopipe[2]; /* pipe attached to child's stdout */ int sepipe[2]; /* pipe attached to child's stderr */ struct mountent *link; /* used when in linked list */ } mountent_t; static mountent_t *mntll; /* head of global linked list of */ /* mountents */ int listlength; /* # of elems in this list */ /* * If the automatic flag (-a) is given and mount points are not specified * on the command line, then do not attempt to umount these. These * generally need to be kept mounted until system shutdown. */ static const char *keeplist[] = { "/", "/dev", "/dev/fd", "/devices", "/etc/mnttab", "/etc/svc/volatile", "/lib", "/proc", "/sbin", CTFS_ROOT, OBJFS_ROOT, "/tmp", "/usr", "/var", "/var/adm", "/var/run", SHARETAB, NULL }; static void nomem(); static void doexec(struct mnttab *); static int setup_iopipe(mountent_t *); static void setup_output(mountent_t *); static void doio(mountent_t *); static void do_umounts(mountent_t **); static int dowait(); static int parumount(); static int mcompar(const void *, const void *); static void cleanup(int); static mountent_t **make_mntarray(char **, int); static mountent_t *getmntall(); static mountent_t *new_mountent(struct mnttab *); static mountent_t *getmntlast(mountent_t *, char *, char *); int main(int argc, char **argv) { int cc; struct mnttab mget; char *mname, *is_special; int fscnt; mountent_t *mp; (void) setlocale(LC_ALL, ""); #if !defined(TEXT_DOMAIN) #define TEXT_DOMAIN "SYS_TEST" #endif (void) textdomain(TEXT_DOMAIN); myname = strrchr(argv[0], '/'); if (myname) myname++; else myname = argv[0]; /* * Process the args. * "-d" for compatibility */ while ((cc = getopt(argc, argv, "ado:Vf?")) != -1) switch (cc) { case 'a': aflg++; break; #ifdef DEBUG case 'd': dflg++; break; #endif case '?': usage(); break; case 'o': if (oflg) usage(); else { oflg++; oarg = optarg; } break; case 'f': fflg++; break; case 'V': if (Vflg) usage(); else Vflg++; break; default: usage(); break; } fscnt = argc - optind; if (!aflg && fscnt != 1) usage(); /* copy '--' to specific */ if (strcmp(argv[optind-1], "--") == 0) dashflg++; /* * mnttab may be a symlink to a file in another file system. * This happens during install when / is mounted read-only * and /etc/mnttab is symlinked to a file in /tmp. * If this is the case, we need to follow the symlink to the * read-write file itself so that the subsequent mnttab.temp * open and rename will work. */ if (realpath(MNTTAB, mnttab) == NULL) { strcpy(mnttab, MNTTAB); } /* * bugid 1205242 * call the realpath() here, so that if the user is * trying to umount an autofs directory, the directory * is forced to mount. */ mname = argv[optind]; is_special = realpath(mname, resolve); /* * Read the whole mnttab into memory. */ mntll = getmntall(); if (aflg && fscnt != 1) exit(parumount(argv + optind, fscnt)); aflg = 0; mntnull(&mget); if (listlength == 0) { fprintf(stderr, gettext( "%s: warning: no entries found in %s\n"), myname, mnttab); mget.mnt_mountp = mname; /* assume mount point */ no_mnttab++; doexec(&mget); exit(0); } mp = NULL; /* * if realpath fails, it can't be a mount point, so we'll * go straight to the code that treats the arg as a special. * if realpath succeeds, it could be a special or a mount point; * we'll start by assuming it's a mount point, and if it's not, * try to treat it as a special. */ if (is_special != NULL) { /* * if this succeeds, * we'll have the appropriate record; if it fails * we'll assume the arg is a special of some sort */ mp = getmntlast(mntll, NULL, resolve); } /* * Since stackable mount is allowed (RFE 2001535), * we will un-mount the last entry in the MNTTAB that matches. */ if (mp == NULL) { /* * Perhaps there is a bogus mnttab entry that * can't be resolved: */ if ((mp = getmntlast(mntll, NULL, mname)) == NULL) /* * assume it's a device (special) now */ mp = getmntlast(mntll, mname, NULL); if (mp) { /* * Found it. * This is a device. Now we want to know if * it stackmounted on by something else. * The original fix for bug 1103850 has a * problem with lockfs (bug 1119731). This * is a revised method. */ mountent_t *lmp; lmp = getmntlast(mntll, NULL, mp->ment.mnt_mountp); if (lmp && strcmp(lmp->ment.mnt_special, mp->ment.mnt_special)) { errno = EBUSY; rpterr(mname); exit(1); } } else { fprintf(stderr, gettext( "%s: warning: %s not in mnttab\n"), myname, mname); if (Vflg) exit(1); /* * same error as mount -V * would give for unknown * mount point */ mget.mnt_special = mget.mnt_mountp = mname; } } if (mp) doexec(&mp->ment); else doexec(&mget); return (0); } void doexec(struct mnttab *ment) { int ret; #ifdef DEBUG if (dflg) fprintf(stderr, "%d: umounting %s\n", getpid(), ment->mnt_mountp); #endif /* try to exec the dependent portion */ if ((ment->mnt_fstype != NULL) || Vflg) { char full_path[FULLPATH_MAX]; char alter_path[FULLPATH_MAX]; char *newargv[ARGV_MAX]; int ii; if (strlen(ment->mnt_fstype) > (size_t)FSTYPE_MAX) { fprintf(stderr, gettext( "%s: FSType %s exceeds %d characters\n"), myname, ment->mnt_fstype, FSTYPE_MAX); exit(1); } /* build the full pathname of the fstype dependent command. */ sprintf(full_path, "%s/%s/%s", fs_path, ment->mnt_fstype, myname); sprintf(alter_path, "%s/%s/%s", alt_path, ment->mnt_fstype, myname); /* * create the new arg list, and end the list with a * null pointer */ ii = 2; if (oflg) { newargv[ii++] = "-o"; newargv[ii++] = oarg; } if (dashflg) { newargv[ii++] = "--"; } if (fflg) { newargv[ii++] = "-f"; } newargv[ii++] = (ment->mnt_mountp) ? ment->mnt_mountp : ment->mnt_special; newargv[ii] = NULL; /* set the new argv[0] to the filename */ newargv[1] = myname; if (Vflg) { printf("%s", myname); for (ii = 2; newargv[ii]; ii++) printf(" %s", newargv[ii]); printf("\n"); fflush(stdout); exit(0); } /* Try to exec the fstype dependent umount. */ execv(full_path, &newargv[1]); if (errno == ENOEXEC) { newargv[0] = "sh"; newargv[1] = full_path; execv("/sbin/sh", &newargv[0]); } newargv[1] = myname; execv(alter_path, &newargv[1]); if (errno == ENOEXEC) { newargv[0] = "sh"; newargv[1] = alter_path; execv("/sbin/sh", &newargv[0]); } /* exec failed */ if (errno != ENOENT) { fprintf(stderr, gettext("umount: cannot execute %s\n"), full_path); exit(1); } } /* * No fstype independent executable then. We'll go generic * from here. */ /* don't use -o with generic */ if (oflg) { fprintf(stderr, gettext( "%s: %s specific umount does not exist; -o suboption ignored\n"), myname, ment->mnt_fstype ? ment->mnt_fstype : ""); } signal(SIGHUP, SIG_IGN); signal(SIGQUIT, SIG_IGN); signal(SIGINT, SIG_IGN); /* * Try to umount the mountpoint. * If that fails, try the corresponding special. * (This ordering is necessary for nfs umounts.) * (for remote resources: if the first umount returns EBUSY * don't call umount again - umount() with a resource name * will return a misleading error to the user */ if (fflg) { if (((ret = umount2(ment->mnt_mountp, MS_FORCE)) < 0) && (errno != EBUSY && errno != ENOTSUP && errno != EPERM)) ret = umount2(ment->mnt_special, MS_FORCE); } else { if (((ret = umount2(ment->mnt_mountp, 0)) < 0) && (errno != EBUSY) && (errno != EPERM)) ret = umount2(ment->mnt_special, 0); } if (ret < 0) { rpterr(ment->mnt_mountp); if (errno != EINVAL && errno != EFAULT) exit(1); exitcode = 1; } exit(exitcode); } void rpterr(char *sp) { switch (errno) { case EPERM: fprintf(stderr, gettext("%s: permission denied\n"), myname); break; case ENXIO: fprintf(stderr, gettext("%s: %s no device\n"), myname, sp); break; case ENOENT: fprintf(stderr, gettext("%s: %s no such file or directory\n"), myname, sp); break; case EINVAL: fprintf(stderr, gettext("%s: %s not mounted\n"), myname, sp); break; case EBUSY: fprintf(stderr, gettext("%s: %s busy\n"), myname, sp); break; case ENOTBLK: fprintf(stderr, gettext("%s: %s block device required\n"), myname, sp); break; case ECOMM: fprintf(stderr, gettext("%s: warning: broken link detected\n"), myname); break; default: perror(myname); fprintf(stderr, gettext("%s: cannot unmount %s\n"), myname, sp); } } void usage(void) { fprintf(stderr, gettext( "Usage:\n%s [-f] [-V] [-o specific_options] {special | mount-point}\n"), myname); fprintf(stderr, gettext( "%s -a [-f] [-V] [-o specific_options] [mount_point ...]\n"), myname); exit(1); } void mnterror(int flag) { switch (flag) { case MNT_TOOLONG: fprintf(stderr, gettext("%s: line in mnttab exceeds %d characters\n"), myname, MNT_LINE_MAX-2); break; case MNT_TOOFEW: fprintf(stderr, gettext("%s: line in mnttab has too few entries\n"), myname); break; default: break; } } /* * Search the mlist linked list for the * first match of specp or mntp. The list is expected to be in reverse * order of /etc/mnttab. * If both are specified, then both have to match. * Returns the (mountent_t *) of the match, otherwise returns NULL. */ mountent_t * getmntlast(mountent_t *mlist, char *specp, char *mntp) { int mfound, sfound; for (/* */; mlist; mlist = mlist->link) { mfound = sfound = 0; if (mntp && (strcmp(mlist->ment.mnt_mountp, mntp) == 0)) { if (specp == NULL) return (mlist); mfound++; } if (specp && (strcmp(mlist->ment.mnt_special, specp) == 0)) { if (mntp == NULL) return (mlist); sfound++; } if (mfound && sfound) return (mlist); } return (NULL); } /* * Perform the parallel version of umount. Returns 0 if no errors occurred, * non zero otherwise. */ int parumount(char **mntlist, int count) { int maxfd = OPEN_MAX; struct rlimit rl; mountent_t **mntarray, **ml, *mp; /* * If no mount points are specified and none were found in mnttab, * then end it all here. */ if (count == 0 && mntll == NULL) return (0); /* * This is the process scaling section. After running a series * of tests based on the number of simultaneous processes and * processors available, optimum performance was achieved near or * at (PROCN * 2). */ if ((maxrun = sysconf(_SC_NPROCESSORS_ONLN)) == -1) maxrun = 4; else maxrun = maxrun * 2 + 1; if (getrlimit(RLIMIT_NOFILE, &rl) == 0) { rl.rlim_cur = rl.rlim_max; if (setrlimit(RLIMIT_NOFILE, &rl) == 0) maxfd = (int)rl.rlim_cur; (void) enable_extended_FILE_stdio(-1, -1); } /* * The parent needs to maintain 3 of its own fd's, plus 2 for * each child (the stdout and stderr pipes). */ maxfd = (maxfd / 2) - 6; /* 6 takes care of temporary */ /* periods of open fds */ if (maxfd < maxrun) maxrun = maxfd; if (maxrun < 4) maxrun = 4; /* sanity check */ mntarray = make_mntarray(mntlist, count); if (listlength == 0) { if (count == 0) /* not an error, just none found */ return (0); fprintf(stderr, gettext("%s: no valid entries found in %s\n"), myname, mnttab); return (1); } /* * Sort the entries based on their mount level only if lofs's are * not present. */ if (lofscnt == 0) { qsort((void *)mntarray, listlength, sizeof (mountent_t *), mcompar); /* * If we do not detect a lofs by now, we never will. */ lofscnt = -1; } /* * Now link them up so that a given pid is easier to find when * we go to clean up after they are done. */ mntll = mntarray[0]; for (ml = mntarray; mp = *ml; /* */) mp->link = *++ml; /* * Try to handle interrupts in a reasonable way. */ sigset(SIGHUP, cleanup); sigset(SIGQUIT, cleanup); sigset(SIGINT, cleanup); do_umounts(mntarray); /* do the umounts */ return (exitcode); } /* * Returns a mountent_t array based on mntlist. If mntlist is NULL, then * it returns all mnttab entries with a few exceptions. Sets the global * variable listlength to the number of entries in the array. */ mountent_t ** make_mntarray(char **mntlist, int count) { mountent_t *mp, **mpp; int ndx; char *cp; if (count > 0) listlength = count; mpp = (mountent_t **)malloc(sizeof (*mp) * (listlength + 1)); if (mpp == NULL) nomem(); if (count == 0) { if (mntll == NULL) { /* no entries? */ listlength = 0; return (NULL); } /* * No mount list specified: take all mnttab mount points * except for a few cases. */ for (ndx = 0, mp = mntll; mp; mp = mp->link) { if (fsstrinlist(mp->ment.mnt_mountp, keeplist)) continue; mp->mlevel = fsgetmlevel(mp->ment.mnt_mountp); if (mp->ment.mnt_fstype && (strcmp(mp->ment.mnt_fstype, MNTTYPE_LOFS) == 0)) lofscnt++; mpp[ndx++] = mp; } mpp[ndx] = NULL; listlength = ndx; return (mpp); } /* * A list of mount points was specified on the command line. * Build an array out of these. */ for (ndx = 0; count--; ) { cp = *mntlist++; if (realpath(cp, resolve) == NULL) { fprintf(stderr, gettext("%s: warning: can't resolve %s\n"), myname, cp); exitcode = 1; mp = getmntlast(mntll, NULL, cp); /* try anyways */ } else mp = getmntlast(mntll, NULL, resolve); if (mp == NULL) { struct mnttab mnew; /* * Then we've reached the end without finding * what we are looking for, but we still have to * try to umount it: append it to mntarray. */ fprintf(stderr, gettext( "%s: warning: %s not found in %s\n"), myname, resolve, mnttab); exitcode = 1; mntnull(&mnew); mnew.mnt_special = mnew.mnt_mountp = strdup(resolve); if (mnew.mnt_special == NULL) nomem(); mp = new_mountent(&mnew); } if (mp->ment.mnt_fstype && (strcmp(mp->ment.mnt_fstype, MNTTYPE_LOFS) == 0)) lofscnt++; mp->mlevel = fsgetmlevel(mp->ment.mnt_mountp); mpp[ndx++] = mp; } mpp[ndx] = NULL; listlength = ndx; return (mpp); } /* * Returns the tail of a linked list of all mnttab entries. I.e, it's faster * to return the mnttab in reverse order. * Sets listlength to the number of entries in the list. * Returns NULL if none are found. */ mountent_t * getmntall(void) { FILE *fp; mountent_t *mtail; int cnt = 0, ret; struct mnttab mget; if ((fp = fopen(mnttab, "r")) == NULL) { fprintf(stderr, gettext("%s: warning cannot open %s\n"), myname, mnttab); return (0); } mtail = NULL; while ((ret = getmntent(fp, &mget)) != -1) { mountent_t *mp; if (ret > 0) { mnterror(ret); continue; } mp = new_mountent(&mget); mp->link = mtail; mtail = mp; cnt++; } fclose(fp); if (mtail == NULL) { listlength = 0; return (NULL); } listlength = cnt; return (mtail); } void do_umounts(mountent_t **mntarray) { mountent_t *mp, *mpprev, **ml = mntarray; int cnt = listlength; /* * Main loop for the forked children: */ for (mpprev = *ml; mp = *ml; mpprev = mp, ml++, cnt--) { pid_t pid; /* * Check to see if we cross a mount level: e.g., * /a/b/c -> /a/b. If so, we need to wait for all current * umounts to finish before umounting the rest. * * Also, we unmount serially as long as there are lofs's * to mount to avoid improper umount ordering. */ if (mp->mlevel < mpprev->mlevel || lofscnt > 0) while (nrun > 0 && (dowait() != -1)) ; if (lofscnt == 0) { /* * We can now go to parallel umounting. */ qsort((void *)ml, cnt, sizeof (mountent_t *), mcompar); mp = *ml; /* possible first entry */ lofscnt--; /* so we don't do this again */ } while (setup_iopipe(mp) == -1 && (dowait() != -1)) ; while (nrun >= maxrun && (dowait() != -1)) /* throttle */ ; #ifdef CACHEFS_BUG /* * If this is the back file system, then let cachefs/umount * unmount it. */ if (strstr(mp->ment.mnt_mountp, BACKMNT_NAME)) continue; if (mp->ment.mnt_fstype && (strcmp(mp->ment.mnt_fstype, "cachefs") == 0)) { while (cachefs_running && (dowait() != -1)) ; cachefs_running = 1; } #endif if ((pid = fork()) == -1) { perror("fork"); cleanup(-1); /* not reached */ } #ifdef DEBUG if (dflg && pid > 0) { fprintf(stderr, "parent %d: umounting %d %s\n", getpid(), pid, mp->ment.mnt_mountp); } #endif if (pid == 0) { /* child */ signal(SIGHUP, SIG_IGN); signal(SIGQUIT, SIG_IGN); signal(SIGINT, SIG_IGN); setup_output(mp); doexec(&mp->ment); perror("exec"); exit(1); } /* parent */ (void) close(mp->sopipe[WRPIPE]); (void) close(mp->sepipe[WRPIPE]); mp->pid = pid; nrun++; } cleanup(0); } /* * cleanup the existing children and exit with an error * if asig != 0. */ void cleanup(int asig) { /* * Let the stragglers finish. */ while (nrun > 0 && (dowait() != -1)) ; if (asig != 0) exit(1); } /* * Waits for 1 child to die. * * Returns -1 if no children are left to wait for. * Returns 0 if a child died without an error. * Returns 1 if a child died with an error. * Sets the global exitcode if an error occurred. */ int dowait(void) { int wstat, child, ret; mountent_t *mp, *prevp; if ((child = wait(&wstat)) == -1) return (-1); if (WIFEXITED(wstat)) /* this should always be true */ ret = WEXITSTATUS(wstat); else ret = 1; /* assume some kind of error */ nrun--; if (ret) exitcode = 1; /* * Find our child so we can process its std output, if any. * This search gets smaller and smaller as children are cleaned * up. */ for (prevp = NULL, mp = mntll; mp; mp = mp->link) { if (mp->pid != child) { prevp = mp; continue; } /* * Found: let's remove it from this list. */ if (prevp) { prevp->link = mp->link; mp->link = NULL; } break; } if (mp == NULL) { /* * This should never happen. */ #ifdef DEBUG fprintf(stderr, gettext( "%s: unknown child %d\n"), myname, child); #endif exitcode = 1; return (1); } doio(mp); /* Any output? */ if (mp->ment.mnt_fstype && (strcmp(mp->ment.mnt_fstype, MNTTYPE_LOFS) == 0)) lofscnt--; #ifdef CACHEFS_BUG if (mp->ment.mnt_fstype && (strcmp(mp->ment.mnt_fstype, "cachefs") == 0)) cachefs_running = 0; #endif return (ret); } static const mountent_t zmount = { 0 }; mountent_t * new_mountent(struct mnttab *ment) { mountent_t *new; new = (mountent_t *)malloc(sizeof (*new)); if (new == NULL) nomem(); *new = zmount; if (ment->mnt_special && (new->ment.mnt_special = strdup(ment->mnt_special)) == NULL) nomem(); if (ment->mnt_mountp && (new->ment.mnt_mountp = strdup(ment->mnt_mountp)) == NULL) nomem(); if (ment->mnt_fstype && (new->ment.mnt_fstype = strdup(ment->mnt_fstype)) == NULL) nomem(); return (new); } /* * Sort in descending order of "mount level". For example, /a/b/c is * placed before /a/b . */ int mcompar(const void *a, const void *b) { mountent_t *a1, *b1; a1 = *(mountent_t **)a; b1 = *(mountent_t **)b; return (b1->mlevel - a1->mlevel); } /* * The purpose of this routine is to form stdout and stderr * pipes for the children's output. The parent then reads and writes it * out it serially in order to ensure that the output is * not garbled. */ int setup_iopipe(mountent_t *mp) { /* * Make a stdout and stderr pipe. This should never fail. */ if (pipe(mp->sopipe) == -1) return (-1); if (pipe(mp->sepipe) == -1) { (void) close(mp->sopipe[RDPIPE]); (void) close(mp->sopipe[WRPIPE]); return (-1); } /* * Don't block on an empty pipe. */ (void) fcntl(mp->sopipe[RDPIPE], F_SETFL, O_NDELAY|O_NONBLOCK); (void) fcntl(mp->sepipe[RDPIPE], F_SETFL, O_NDELAY|O_NONBLOCK); return (0); } /* * Called by a child to attach its stdout and stderr to the write side of * the pipes. */ void setup_output(mountent_t *mp) { (void) close(fileno(stdout)); (void) dup(mp->sopipe[WRPIPE]); (void) close(mp->sopipe[WRPIPE]); (void) close(fileno(stderr)); (void) dup(mp->sepipe[WRPIPE]); (void) close(mp->sepipe[WRPIPE]); } /* * Parent uses this to print any stdout or stderr output issued by * the child. */ static void doio(mountent_t *mp) { int bytes; while ((bytes = read(mp->sepipe[RDPIPE], ibuf, sizeof (ibuf))) > 0) write(fileno(stderr), ibuf, bytes); while ((bytes = read(mp->sopipe[RDPIPE], ibuf, sizeof (ibuf))) > 0) write(fileno(stdout), ibuf, bytes); (void) close(mp->sopipe[RDPIPE]); (void) close(mp->sepipe[RDPIPE]); } void nomem(void) { fprintf(stderr, gettext("%s: out of memory\n"), myname); /* * Let the stragglers finish. */ while (nrun > 0 && (dowait() != -1)) ; exit(1); }