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d48b626da3
device file and the mount point. This prevents the "unexpected recursive lock" panic from happening. This is a temporary fix. A kernel fix would be much much more ugly than this, and still wouldn't be the "right" way to fix it. After some of Terry's file system rework is installed, it will be possible to properly fix this problem in a clean manner. Until then, this change should prevent use from getting a problem report on this every month or so (and I just noticed that someone in one of the freebsd news groups was complaining about this problem, too).
543 lines
12 KiB
C
543 lines
12 KiB
C
/*
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* Copyright (c) 1980, 1989, 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1989, 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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static char sccsid[] = "@(#)mount.c 8.19 (Berkeley) 4/19/94";
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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 <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fstab.h>
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#include <signal.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 "pathnames.h"
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int debug, verbose, skipvfs;
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int badvfsname __P((const char *, const char **));
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int badvfstype __P((int, const char **));
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char *catopt __P((char *, const char *));
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struct statfs
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*getmntpt __P((const char *));
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const char
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**makevfslist __P((char *));
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void mangle __P((char *, int *, const char **));
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int mountfs __P((const char *, const char *, const char *,
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int, const char *, const char *));
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void prmount __P((const char *, const char *, int));
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void usage __P((void));
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/* From mount_ufs.c. */
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int mount_ufs __P((int, char * const *));
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/* Map from mount otions to printable formats. */
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static struct opt {
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int o_opt;
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const char *o_name;
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} optnames[] = {
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{ MNT_ASYNC, "asynchronous" },
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{ MNT_EXPORTED, "NFS exported" },
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{ MNT_LOCAL, "local" },
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{ MNT_NODEV, "nodev" },
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{ MNT_NOEXEC, "noexec" },
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{ MNT_NOSUID, "nosuid" },
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{ MNT_QUOTA, "with quotas" },
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{ MNT_RDONLY, "read-only" },
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{ MNT_SYNCHRONOUS, "synchronous" },
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{ MNT_UNION, "union" },
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{ MNT_USER, "user mount" },
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{ NULL }
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};
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int
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main(argc, argv)
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int argc;
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char * const argv[];
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{
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const char *mntonname, **vfslist, *vfstype;
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struct fstab *fs;
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struct statfs *mntbuf;
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FILE *mountdfp;
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pid_t pid;
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int all, ch, i, init_flags, mntsize, rval;
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char *options;
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all = init_flags = 0;
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options = NULL;
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vfslist = NULL;
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vfstype = "ufs";
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while ((ch = getopt(argc, argv, "adfo:rwt:uv")) != EOF)
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switch (ch) {
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case 'a':
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all = 1;
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break;
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case 'd':
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debug = 1;
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break;
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case 'f':
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init_flags |= MNT_FORCE;
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break;
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case 'o':
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if (*optarg)
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options = catopt(options, optarg);
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break;
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case 'r':
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init_flags |= MNT_RDONLY;
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break;
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case 't':
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if (vfslist != NULL)
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errx(1, "only one -t option may be specified.");
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vfslist = makevfslist(optarg);
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vfstype = optarg;
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break;
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case 'u':
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init_flags |= MNT_UPDATE;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'w':
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init_flags &= ~MNT_RDONLY;
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break;
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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argc -= optind;
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argv += optind;
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#define BADTYPE(type) \
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(strcmp(type, FSTAB_RO) && \
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strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
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rval = 0;
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switch (argc) {
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case 0:
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if (all)
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while ((fs = getfsent()) != NULL) {
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if (BADTYPE(fs->fs_type))
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continue;
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if (badvfsname(fs->fs_vfstype, vfslist))
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continue;
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if (strstr(fs->fs_mntops, "noauto"))
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continue;
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if (mountfs(fs->fs_vfstype, fs->fs_spec,
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fs->fs_file, init_flags, options,
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fs->fs_mntops))
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rval = 1;
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}
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else {
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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 (badvfstype(mntbuf[i].f_type, vfslist))
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continue;
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prmount(mntbuf[i].f_mntfromname,
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mntbuf[i].f_mntonname, mntbuf[i].f_flags);
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}
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}
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exit(rval);
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case 1:
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if (vfslist != NULL)
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usage();
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if (init_flags & MNT_UPDATE) {
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if ((mntbuf = getmntpt(*argv)) == NULL)
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errx(1,
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"unknown special file or file system %s.",
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*argv);
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if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
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errx(1, "can't find fstab entry for %s.",
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*argv);
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/* If it's an update, ignore the fstab file options. */
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fs->fs_mntops = NULL;
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mntonname = mntbuf->f_mntonname;
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} else {
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if ((fs = getfsfile(*argv)) == NULL &&
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(fs = getfsspec(*argv)) == NULL)
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errx(1,
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"%s: unknown special file or file system.",
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*argv);
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if (BADTYPE(fs->fs_type))
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errx(1, "%s has unknown file system type.",
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*argv);
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mntonname = fs->fs_file;
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}
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rval = mountfs(fs->fs_vfstype, fs->fs_spec,
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mntonname, init_flags, options, fs->fs_mntops);
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break;
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case 2:
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/*
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* If -t flag has not been specified, and spec contains either
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* a ':' or a '@' then assume that an NFS filesystem is being
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* specified ala Sun.
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*/
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if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
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vfstype = "nfs";
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rval = mountfs(vfstype,
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argv[0], argv[1], init_flags, options, NULL);
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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/*
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* If the mount was successfully, and done by root, tell mountd the
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* good news. Pid checks are probably unnecessary, but don't hurt.
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*/
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if (rval == 0 && getuid() == 0 &&
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(mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
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if (fscanf(mountdfp, "%ld", &pid) == 1 &&
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pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
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err(1, "signal mountd");
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(void)fclose(mountdfp);
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}
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exit(rval);
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}
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int
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mountfs(vfstype, spec, name, flags, options, mntopts)
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const char *vfstype, *spec, *name, *options, *mntopts;
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int flags;
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{
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struct stat sb;
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/* List of directories containing mount_xxx subcommands. */
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static const char *edirs[] = {
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_PATH_SBIN,
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_PATH_USRSBIN,
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NULL
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};
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const char *argv[100], **edir;
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struct statfs sf;
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pid_t pid;
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int argc, i, status;
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char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
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char specpath[MAXPATHLEN];
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if (realpath(name, mntpath) != NULL && stat(mntpath, &sb) == 0) {
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if (!S_ISDIR(sb.st_mode)) {
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warnx("%s: Not a directory", mntpath);
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return (1);
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}
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} else {
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warn("%s", mntpath);
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return (1);
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}
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/*
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* The following check is a kludge to prevent the caller from
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* accidently using the file as the special device file and
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* the mount point. This will cause a panic due to a recursive
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* vnode lock. After some of the planned reworking of the
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* file system code is done, the kernel can be fixed properly
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* and this stupid check can be removed.
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*/
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if (realpath(spec, specpath) == NULL) {
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warn("%s", specpath);
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return (1);
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}
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if (strcmp(mntpath, specpath) == 0) {
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warnx("%s: Special device file and mount point may not be the same",
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specpath);
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return (1);
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}
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if (mntopts == NULL)
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mntopts = "";
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name = mntpath;
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if (options == NULL) {
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if (*mntopts == '\0')
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options = "rw";
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else
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options = mntopts;
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mntopts = "";
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}
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optbuf = catopt(strdup(mntopts), options);
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if (strcmp(name, "/") == 0)
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flags |= MNT_UPDATE;
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if (flags & MNT_FORCE)
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optbuf = catopt(optbuf, "force");
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if (flags & MNT_RDONLY)
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optbuf = catopt(optbuf, "ro");
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/*
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* XXX
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* The mount_mfs (newfs) command uses -o to select the
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* optimisation mode. We don't pass the default "-o rw"
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* for that reason.
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*/
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if (flags & MNT_UPDATE)
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optbuf = catopt(optbuf, "update");
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argc = 0;
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argv[argc++] = vfstype;
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mangle(optbuf, &argc, argv);
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argv[argc++] = spec;
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argv[argc++] = name;
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argv[argc] = NULL;
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if (debug) {
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(void)printf("exec: mount_%s", vfstype);
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for (i = 1; i < argc; i++)
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(void)printf(" %s", argv[i]);
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(void)printf("\n");
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return (0);
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}
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switch (pid = vfork()) {
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case -1: /* Error. */
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warn("vfork");
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free(optbuf);
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return (1);
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case 0: /* Child. */
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if (strcmp(vfstype, "ufs") == 0)
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exit(mount_ufs(argc, (char * const *) argv));
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/* Go find an executable. */
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edir = edirs;
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do {
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(void)snprintf(execname,
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sizeof(execname), "%s/mount_%s", *edir, vfstype);
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execv(execname, (char * const *)argv);
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warn("exec %s for %s", execname, name);
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} while (*++edir != NULL);
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exit(1);
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/* NOTREACHED */
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default: /* Parent. */
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free(optbuf);
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if (waitpid(pid, &status, 0) < 0) {
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warn("waitpid");
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return (1);
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}
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if (WIFEXITED(status)) {
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if (WEXITSTATUS(status) != 0)
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return (WEXITSTATUS(status));
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} else if (WIFSIGNALED(status)) {
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warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
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return (1);
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}
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if (verbose) {
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if (statfs(name, &sf) < 0) {
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warn("%s", name);
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return (1);
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}
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prmount(sf.f_mntfromname, sf.f_mntonname, sf.f_flags);
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}
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break;
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}
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return (0);
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}
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void
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prmount(spec, name, flags)
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const char *spec, *name;
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int flags;
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{
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struct opt *o;
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int f;
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(void)printf("%s on %s", spec, name);
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flags &= MNT_VISFLAGMASK;
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for (f = 0, o = optnames; flags && o->o_opt; o++)
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if (flags & o->o_opt) {
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(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
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flags &= ~o->o_opt;
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}
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(void)printf(f ? ")\n" : "\n");
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}
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struct statfs *
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getmntpt(name)
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const char *name;
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{
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struct statfs *mntbuf;
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int i, mntsize;
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mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
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for (i = 0; i < mntsize; i++)
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if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
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strcmp(mntbuf[i].f_mntonname, name) == 0)
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return (&mntbuf[i]);
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return (NULL);
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}
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int
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badvfsname(vfsname, vfslist)
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const char *vfsname;
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const char **vfslist;
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{
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if (vfslist == NULL)
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return (0);
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while (*vfslist != NULL) {
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if (strcmp(vfsname, *vfslist) == 0)
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return (skipvfs);
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++vfslist;
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}
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return (!skipvfs);
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}
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int
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badvfstype(vfstype, vfslist)
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int vfstype;
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const char **vfslist;
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{
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struct vfsconf *vfc;
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vfc = getvfsbytype(vfstype);
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if ( ! vfc )
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return (0);
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return (badvfsname(vfc->vfc_name, vfslist));
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}
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const char **
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makevfslist(fslist)
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char *fslist;
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{
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const char **av;
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int i;
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char *nextcp;
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if (fslist == NULL)
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return (NULL);
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if (fslist[0] == 'n' && fslist[1] == 'o') {
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fslist += 2;
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skipvfs = 1;
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}
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for (i = 0, nextcp = fslist; *nextcp; nextcp++)
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if (*nextcp == ',')
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i++;
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if ((av = malloc((size_t)(i + 2) * sizeof(char *))) == NULL) {
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warn(NULL);
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return (NULL);
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}
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nextcp = fslist;
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i = 0;
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av[i++] = nextcp;
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while ((nextcp = strchr(nextcp, ',')) != NULL) {
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*nextcp++ = '\0';
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av[i++] = nextcp;
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}
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av[i++] = NULL;
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return (av);
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}
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char *
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catopt(s0, s1)
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char *s0;
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const char *s1;
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{
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size_t i;
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char *cp;
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if (s0 && *s0) {
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i = strlen(s0) + strlen(s1) + 1 + 1;
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if ((cp = malloc(i)) == NULL)
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err(1, NULL);
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(void)snprintf(cp, i, "%s,%s", s0, s1);
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} else
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cp = strdup(s1);
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if (s0)
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free(s0);
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return (cp);
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}
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void
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mangle(options, argcp, argv)
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char *options;
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int *argcp;
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const char **argv;
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{
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char *p, *s;
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int argc;
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argc = *argcp;
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for (s = options; (p = strsep(&s, ",")) != NULL;)
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if (*p != '\0')
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if (*p == '-') {
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argv[argc++] = p;
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p = strchr(p, '=');
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if (p) {
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*p = '\0';
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argv[argc++] = p+1;
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}
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} else if (strcmp(p, "rw") != 0) {
|
|
argv[argc++] = "-o";
|
|
argv[argc++] = p;
|
|
}
|
|
|
|
*argcp = argc;
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
|
|
(void)fprintf(stderr,
|
|
"usage: mount %s %s\n mount %s\n mount %s\n",
|
|
"[-dfruvw] [-o options] [-t ufs | external_type]",
|
|
"special node",
|
|
"[-adfruvw] [-t ufs | external_type]",
|
|
"[-dfruvw] special | node");
|
|
exit(1);
|
|
}
|