mount_fs.c

早期freebsd实现

/*
 * Copyright (c) 1990 Jan-Simon Pendry
 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry at Imperial College, London.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)mount_fs.c	8.1 (Berkeley) 6/6/93
 *
 * $Id: mount_fs.c,v 5.2.2.2 1992/05/31 16:35:45 jsp Exp $
 *
 */

#include "am.h"
#ifdef NFS_3
typedef nfs_fh fhandle_t;
#endif /* NFS_3 */
#include <sys/mount.h>

#include <sys/stat.h>

/*
 * Standard mount flags
 */
#ifdef hpux
/*
 * HP-UX has an annoying feature of printing
 * error msgs on /dev/console
 */
#undef M_NOSUID
#endif /* hpux */

struct opt_tab mnt_flags[] = {
	{ "ro", M_RDONLY },
#ifdef M_CACHE
	{ "nocache", M_NOCACHE },
#endif /* M_CACHE */
#ifdef M_GRPID
	{ "grpid", M_GRPID },
#endif /* M_GRPID */
#ifdef M_MULTI
	{ "multi", M_MULTI },
#endif /* M_MULTI */
#ifdef M_NODEV
	{ "nodev", M_NODEV },
#endif /* M_NODEV */
#ifdef M_NOEXEC
	{ "noexec", M_NOEXEC },
#endif /* M_NOEXEC */
#ifdef M_NOSUB
	{ "nosub", M_NOSUB },
#endif /* M_NOSUB */
#ifdef M_NOSUID
	{ "nosuid", M_NOSUID },
#endif /* M_NOSUID */
#ifdef M_SYNC
	{ "sync", M_SYNC },
#endif /* M_SYNC */
	{ 0, 0 }
};

int compute_mount_flags(mnt)
struct mntent *mnt;
{
	struct opt_tab *opt;
	int flags;
#ifdef NFS_4
	flags = M_NEWTYPE;
#else
	flags = 0;
#endif /* NFS_4 */

	/*
	 * Crack basic mount options
	 */
	for (opt = mnt_flags; opt->opt; opt++)
		flags |= hasmntopt(mnt, opt->opt) ? opt->flag : 0;

	return flags;
}

int mount_fs P((struct mntent *mnt, int flags, caddr_t mnt_data, int retry, MTYPE_TYPE type));
int mount_fs(mnt, flags, mnt_data, retry, type)
struct mntent *mnt;
int flags;
caddr_t mnt_data;
int retry;
MTYPE_TYPE type;
{
	int error = 0;
#ifdef MNTINFO_DEV
	struct stat stb;
	char *xopts = 0;
#endif /* MNTINFO_DEV */

#ifdef DEBUG
#ifdef NFS_4
	dlog("%s fstype %s (%s) flags %#x (%s)",
		mnt->mnt_dir, type, mnt->mnt_type, flags, mnt->mnt_opts);
#else
	dlog("%s fstype %d (%s) flags %#x (%s)",
		mnt->mnt_dir, type, mnt->mnt_type, flags, mnt->mnt_opts);
#endif /* NFS_4 */
#endif /* DEBUG */

	/*
	 * Fake some mount table entries for the automounter
	 */
#ifdef FASCIST_DF_COMMAND
	/*
	 * Some systems have a df command which blows up when
	 * presented with an unknown mount type.
	 */
	if (STREQ(mnt->mnt_type, MNTTYPE_AUTO)) {
		/*
		 * Try it with the normal name
		 */
		mnt->mnt_type = FASCIST_DF_COMMAND;
	}
#endif /* FASCIST_DF_COMMAND */

again:
	clock_valid = 0;
	error = MOUNT_TRAP(type, mnt, flags, mnt_data);
	if (error < 0)
		plog(XLOG_ERROR, "%s: mount: %m", mnt->mnt_dir);
	if (error < 0 && --retry > 0) {
		sleep(1);
		goto again;
	}
	if (error < 0) {
#ifdef notdef
		if (automount)
			going_down(errno);
#endif
		return errno;
	}

#ifdef UPDATE_MTAB
#ifdef MNTINFO_DEV
	/*
	 * Add the extra dev= field to the mount table.
	 */
	if (lstat(mnt->mnt_dir, &stb) == 0) {
		char *zopts = (char *) xmalloc(strlen(mnt->mnt_opts) + 32);
		xopts = mnt->mnt_opts;
		if (sizeof(stb.st_dev) == 2) {
			/* e.g. SunOS 4.1 */
			sprintf(zopts, "%s,%s=%s%04lx", xopts, MNTINFO_DEV,
					MNTINFO_PREF, (u_long) stb.st_dev & 0xffff);
		} else {
			/* e.g. System Vr4 */
			sprintf(zopts, "%s,%s=%s%08lx", xopts, MNTINFO_DEV,
					MNTINFO_PREF, (u_long) stb.st_dev);
		}
		mnt->mnt_opts = zopts;
	}
#endif /* MNTINFO_DEV */

#ifdef FIXUP_MNTENT
	/*
	 * Additional fields in struct mntent
	 * are fixed up here
	 */
	FIXUP_MNTENT(mnt);
#endif

	write_mntent(mnt);
#ifdef MNTINFO_DEV
	if (xopts) {
		free(mnt->mnt_opts);
		mnt->mnt_opts = xopts;
	}
#endif /* MNTINFO_DEV */
#endif /* UPDATE_MTAB */

	return 0;
}

#ifdef NEED_MNTOPT_PARSER
/*
 * Some systems don't provide these to the user,
 * but amd needs them, so...
 *
 * From: Piete Brooks <[e-mail]>
 */

#include <ctype.h>

static char *nextmntopt(p)
char **p;
{
	char *cp = *p;
	char *rp;
	/*
	 * Skip past white space
	 */
	while (*cp && isspace(*cp))
		cp++;
	/*
	 * Word starts here
	 */
	rp = cp;
	/*
	 * Scan to send of string or separator
	 */
	while (*cp && *cp != ',')
		cp++;
	/*
	 * If separator found the overwrite with nul char.
	 */
	if (*cp) {
		*cp = '\0';
		cp++;
	}
	/*
	 * Return value for next call
	 */
	*p = cp;
	return rp;
}

char *hasmntopt(mnt, opt)
struct mntent *mnt;
char *opt;
{
	char t[MNTMAXSTR];
	char *f;
	char *o = t;
	int l = strlen(opt);
	strcpy(t, mnt->mnt_opts);

	while (*(f = nextmntopt(&o)))
		if (strncmp(opt, f, l) == 0)
			return f - t + mnt->mnt_opts;

	return 0;
}
#endif /* NEED_MNTOPT_PARSER */

#ifdef MOUNT_HELPER_SOURCE
#include MOUNT_HELPER_SOURCE
#endif /* MOUNT_HELPER_SOURCE */