OpenSolaris_b135/cmd/fs.d/dev/mount.c
/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <locale.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/mntent.h>
#include <sys/fs/sdev_impl.h>
#define READFLAG_RO 1
#define READFLAG_RW 2
extern int optind;
extern char *optarg;
static char typename[64], *myname;
static char fstype[] = MNTTYPE_DEV;
static int readflag;
static int overlay;
static int remount;
static char *special;
static char *mountpt;
static struct sdev_mountargs mountargs;
static char *myopts[] = {
#define SUBOPT_READONLY 0
"ro",
#define SUBOPT_READWRITE 1
"rw",
#define SUBOPT_ATTRIBDIR 2
"attrdir",
#define SUBOPT_REMOUNT 3
"remount",
NULL
};
static void
usage(void)
{
(void) fprintf(stderr, gettext(
"%s usage:\n%s [-F %s] [-r] [-o specific_options]"
" {special | mount_point}\n%s [-F %s] [-r] [-o specific_options]"
" special mount_point\n"), fstype, myname, fstype, myname, fstype);
exit(1);
}
static int
do_mount(void)
{
int flags = MS_DATA;
if (readflag == READFLAG_RO)
flags |= MS_RDONLY;
if (overlay)
flags |= MS_OVERLAY;
if (remount)
flags |= MS_REMOUNT;
if (mount(special, mountpt, flags, fstype, &mountargs,
sizeof (mountargs), NULL, 0)) {
switch (errno) {
case EPERM:
(void) fprintf(stderr, gettext("%s: not super user\n"),
typename);
break;
case ENXIO:
(void) fprintf(stderr, gettext("%s: %s no such "
"device\n"), typename, special);
break;
case ENOTDIR:
(void) fprintf(stderr, gettext("%s: %s "
"not a directory\n"
"\tor a component of %s is not a directory\n"),
typename, mountpt, special);
break;
case ENOENT:
(void) fprintf(stderr, gettext("%s: %s or %s, no such "
"file or directory\n"),
typename, special, mountpt);
break;
case EINVAL:
(void) fprintf(stderr, gettext("%s: %s is not this "
"filesystem type.\n"), typename, special);
break;
case EBUSY:
(void) fprintf(stderr, gettext("%s: %s "
"is already mounted, %s is busy,\n"
"\tor allowable number of mount points exceeded\n"),
typename, special, mountpt);
break;
case ENOTBLK:
(void) fprintf(stderr, gettext("%s: %s not a block "
"device\n"), typename, special);
break;
case EROFS:
(void) fprintf(stderr, gettext("%s: %s read-only "
"filesystem\n"), typename, special);
break;
case ENOSPC:
(void) fprintf(stderr, gettext("%s: the state of %s "
"is not okay\n"
"\tand read/write mount was attempted\n"),
typename, special);
break;
default:
(void) fprintf(stderr, gettext("%s: cannot mount %s: "
"%s\n"), typename, special, strerror(errno));
break;
}
return (-1);
}
return (0);
}
/*
* Wrapper around strdup().
*/
static char *
do_strdup(const char *s1)
{
char *str;
str = strdup(s1);
if (str == NULL) {
(void) fprintf(stderr, gettext("%s: strdup failed: %s\n"),
typename, strerror(errno));
}
return (str);
}
/*
* Wrapper around stat().
*/
static int
do_stat(const char *path, struct stat *buf)
{
int ret;
ret = stat(path, buf);
if (ret < 0) {
(void) fprintf(stderr, gettext("%s: can't stat %s: %s\n"),
typename, path, strerror(errno));
}
return (ret);
}
/*
* Wraper around realpath()
*/
static char *
do_realpath(const char *path, char *resolved_path)
{
char *ret;
ret = realpath(path, resolved_path);
if (ret == NULL) {
(void) fprintf(stderr, gettext("%s: realpath %s failed: %s\n"),
typename, path, strerror(errno));
}
return (ret);
}
static int
parse_subopts(char *subopts)
{
char *value;
char path[PATH_MAX + 1];
while (*subopts != '\0') {
switch (getsubopt(&subopts, myopts, &value)) {
case SUBOPT_READONLY:
if (readflag == READFLAG_RW) {
(void) fprintf(stderr, gettext("%s: both "
"read-only and read-write options "
"specified\n"), typename);
return (-1);
}
readflag = READFLAG_RO;
break;
case SUBOPT_READWRITE:
if (readflag == READFLAG_RO) {
(void) fprintf(stderr, gettext("%s: both "
"read-only and read-write options "
"specified\n"), typename);
return (-1);
}
readflag = READFLAG_RW;
break;
case SUBOPT_ATTRIBDIR:
if (value == NULL) {
(void) fprintf(stderr, gettext("%s: no "
"attribute directory\n"), typename);
return (-1);
} else {
if (do_realpath(value, path) == NULL)
return (-1);
mountargs.sdev_attrdir =
(uint64_t)(uintptr_t)do_strdup(path);
if (mountargs.sdev_attrdir == NULL)
return (-1);
}
break;
case SUBOPT_REMOUNT:
remount = 1;
break;
default:
(void) fprintf(stderr, gettext("%s: illegal -o "
"suboption: %s\n"), typename, value);
return (-1);
}
}
return (0);
}
int
main(int argc, char **argv)
{
struct stat st;
char mntpath[PATH_MAX + 1];
int cc;
(void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
(void) textdomain(TEXT_DOMAIN);
if (myname = strrchr(argv[0], '/'))
myname++;
else
myname = argv[0];
(void) snprintf(typename, sizeof (typename), "%s %s", fstype, myname);
argv[0] = typename;
while ((cc = getopt(argc, argv, "?o:rmO")) != -1) {
switch (cc) {
case 'r':
if (readflag == READFLAG_RW) {
(void) fprintf(stderr, gettext("%s: both "
"read-only and read-write options "
"specified\n"), typename);
return (1);
}
readflag = READFLAG_RO;
break;
case 'O':
overlay = 1;
break;
case 'o':
if (parse_subopts(optarg))
return (1);
break;
default:
usage();
break;
}
}
/*
* There must be at least 2 more arguments, the
* special file and the directory.
*/
if ((argc - optind) != 2)
usage();
special = argv[optind++];
if (do_realpath(argv[optind++], mntpath) == NULL)
return (1);
mountpt = mntpath;
if (mountpt) {
if (do_stat(mountpt, &st) < 0)
return (1);
if (! S_ISDIR(st.st_mode)) {
(void) fprintf(stderr, gettext("%s: %s is not a "
"directory\n"), typename, mountpt);
return (1);
}
}
if (mountargs.sdev_attrdir) {
if (do_stat((const char *)(uintptr_t)mountargs.sdev_attrdir,
&st) < 0)
return (1);
if (! S_ISDIR(st.st_mode)) {
(void) fprintf(stderr, gettext("%s: %s is not a "
"directory\n"), typename, mountargs.sdev_attrdir);
return (1);
}
}
/* Special checks if /dev is the mount point */
/* Remount of /dev requires an attribute directory */
if (strcmp(mountpt, "/dev") == 0 && remount &&
mountargs.sdev_attrdir == NULL) {
(void) fprintf(stderr, gettext("%s: missing attribute "
"directory\n"), typename);
return (1);
}
(void) signal(SIGHUP, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
(void) signal(SIGINT, SIG_IGN);
/* Perform the mount */
if (do_mount())
return (1);
return (0);
}