278 lines
6.3 KiB
C
278 lines
6.3 KiB
C
/* $NetBSD: mount_lfs.c,v 1.18 2003/08/07 10:04:28 agc Exp $ */
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/*-
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* Copyright (c) 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mount_lfs.c 8.4 (Berkeley) 4/26/95";
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#else
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__RCSID("$NetBSD: mount_lfs.c,v 1.18 2003/08/07 10:04:28 agc Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <ufs/ufs/ufsmount.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <paths.h>
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#include <signal.h>
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#include <mntopts.h>
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#include "pathnames.h"
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static const struct mntopt mopts[] = {
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MOPT_STDOPTS,
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MOPT_UPDATE,
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MOPT_GETARGS,
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MOPT_NOATIME,
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{ NULL }
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};
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int main __P((int, char *[]));
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int mount_lfs __P((int, char *[]));
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static void invoke_cleaner __P((char *));
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static void usage __P((void));
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static void kill_daemon __P((char *));
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static void kill_cleaner __P((char *));
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static int short_rds, cleaner_debug, cleaner_bytes;
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static char *nsegs;
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#ifndef MOUNT_NOMAIN
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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return mount_lfs(argc, argv);
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}
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#endif
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int
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mount_lfs(argc, argv)
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int argc;
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char *argv[];
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{
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struct ufs_args args;
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int ch, mntflags, noclean, mntsize, oldflags, i;
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char *fs_name, *options;
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const char *errcause;
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struct statfs *mntbuf;
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options = NULL;
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nsegs = "4";
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mntflags = noclean = 0;
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cleaner_bytes = 1;
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while ((ch = getopt(argc, argv, "bdN:no:s")) != -1)
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switch (ch) {
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case 'b':
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cleaner_bytes = !cleaner_bytes;
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break;
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case 'd':
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cleaner_debug = 1;
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break;
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case 'n':
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noclean = 1;
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break;
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case 'N':
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nsegs = optarg;
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break;
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case 'o':
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getmntopts(optarg, mopts, &mntflags, 0);
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break;
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case 's':
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short_rds = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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args.fspec = argv[0]; /* the name of the device file */
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fs_name = argv[1]; /* the mount point */
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#define DEFAULT_ROOTUID -2
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args.export.ex_root = DEFAULT_ROOTUID;
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if (mntflags & MNT_RDONLY) {
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args.export.ex_flags = MNT_EXRDONLY;
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noclean = 1;
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} else
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args.export.ex_flags = 0;
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/*
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* Record the previous status of this filesystem (if any) before
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* performing the mount, so we can know whether to start or
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* kill the cleaner process below.
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*/
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oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */
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if (mntflags & MNT_UPDATE) {
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if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
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err(1, "getmntinfo");
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for (i = 0; i < mntsize; i++) {
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if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) {
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oldflags = mntbuf[i].f_flags;
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break;
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}
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}
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}
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if (mount(MOUNT_LFS, fs_name, mntflags, &args)) {
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switch (errno) {
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case EMFILE:
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errcause = "mount table full";
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break;
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case EINVAL:
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if (mntflags & MNT_UPDATE)
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errcause =
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"specified device does not match mounted device";
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else
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errcause = "incorrect super block";
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break;
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default:
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errcause = strerror(errno);
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break;
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}
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errx(1, "%s on %s: %s", args.fspec, fs_name, errcause);
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}
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/* Not mounting fresh or upgrading to r/w; don't start the cleaner */
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if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY))
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noclean = 1;
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if (!noclean)
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invoke_cleaner(fs_name);
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/* NOTREACHED */
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/* Downgrade to r/o; kill the cleaner */
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if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY))
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kill_cleaner(fs_name);
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exit(0);
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}
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static void
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kill_daemon(pidname)
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char *pidname;
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{
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FILE *fp;
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char s[80];
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pid_t pid;
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fp = fopen(pidname, "r");
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if (fp) {
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fgets(s, 80, fp);
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pid = atoi(s);
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if (pid)
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kill(pid, SIGINT);
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fclose(fp);
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}
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}
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static void
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kill_cleaner(name)
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char *name;
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{
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char *pidname;
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char *cp;
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int off;
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/* Parent first */
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asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name);
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if (!pidname)
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err(1, "malloc");
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off = strlen(_PATH_VARRUN);
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while((cp = strchr(pidname + off, '/')) != NULL)
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*cp = '|';
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kill_daemon(pidname);
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free(pidname);
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/* Then child */
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asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name);
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if (!pidname)
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err(1, "malloc");
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off = strlen(_PATH_VARRUN);
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while((cp = strchr(pidname + off, '/')) != NULL)
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*cp = '|';
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kill_daemon(pidname);
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free(pidname);
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}
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static void
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invoke_cleaner(name)
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char *name;
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{
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char *args[6], **ap = args;
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/* Build the argument list. */
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*ap++ = _PATH_LFS_CLEANERD;
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if (cleaner_bytes)
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*ap++ = "-b";
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if (nsegs) {
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*ap++ = "-n";
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*ap++ = nsegs;
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}
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if (short_rds)
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*ap++ = "-s";
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if (cleaner_debug)
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*ap++ = "-d";
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*ap++ = name;
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*ap = NULL;
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execv(args[0], args);
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err(1, "exec %s", _PATH_LFS_CLEANERD);
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}
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static void
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usage()
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{
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(void)fprintf(stderr,
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"usage: mount_lfs [-dns] [-o options] special node\n");
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exit(1);
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}
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