421 lines
9.2 KiB
C
421 lines
9.2 KiB
C
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/fd.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/security.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/genhd.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/async.h>
|
|
#include <linux/fs_struct.h>
|
|
|
|
#include <linux/nfs_fs.h>
|
|
#include <linux/nfs_fs_sb.h>
|
|
#include <linux/nfs_mount.h>
|
|
|
|
#include "do_mounts.h"
|
|
|
|
int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
|
|
|
|
int root_mountflags = MS_RDONLY | MS_SILENT;
|
|
static char * __initdata root_device_name;
|
|
static char __initdata saved_root_name[64];
|
|
static int __initdata root_wait;
|
|
|
|
dev_t ROOT_DEV;
|
|
|
|
static int __init load_ramdisk(char *str)
|
|
{
|
|
rd_doload = simple_strtol(str,NULL,0) & 3;
|
|
return 1;
|
|
}
|
|
__setup("load_ramdisk=", load_ramdisk);
|
|
|
|
static int __init readonly(char *str)
|
|
{
|
|
if (*str)
|
|
return 0;
|
|
root_mountflags |= MS_RDONLY;
|
|
return 1;
|
|
}
|
|
|
|
static int __init readwrite(char *str)
|
|
{
|
|
if (*str)
|
|
return 0;
|
|
root_mountflags &= ~MS_RDONLY;
|
|
return 1;
|
|
}
|
|
|
|
__setup("ro", readonly);
|
|
__setup("rw", readwrite);
|
|
|
|
/*
|
|
* Convert a name into device number. We accept the following variants:
|
|
*
|
|
* 1) device number in hexadecimal represents itself
|
|
* 2) /dev/nfs represents Root_NFS (0xff)
|
|
* 3) /dev/<disk_name> represents the device number of disk
|
|
* 4) /dev/<disk_name><decimal> represents the device number
|
|
* of partition - device number of disk plus the partition number
|
|
* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
|
|
* used when disk name of partitioned disk ends on a digit.
|
|
*
|
|
* If name doesn't have fall into the categories above, we return (0,0).
|
|
* block_class is used to check if something is a disk name. If the disk
|
|
* name contains slashes, the device name has them replaced with
|
|
* bangs.
|
|
*/
|
|
|
|
dev_t name_to_dev_t(char *name)
|
|
{
|
|
char s[32];
|
|
char *p;
|
|
dev_t res = 0;
|
|
int part;
|
|
|
|
if (strncmp(name, "/dev/", 5) != 0) {
|
|
unsigned maj, min;
|
|
|
|
if (sscanf(name, "%u:%u", &maj, &min) == 2) {
|
|
res = MKDEV(maj, min);
|
|
if (maj != MAJOR(res) || min != MINOR(res))
|
|
goto fail;
|
|
} else {
|
|
res = new_decode_dev(simple_strtoul(name, &p, 16));
|
|
if (*p)
|
|
goto fail;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
name += 5;
|
|
res = Root_NFS;
|
|
if (strcmp(name, "nfs") == 0)
|
|
goto done;
|
|
res = Root_RAM0;
|
|
if (strcmp(name, "ram") == 0)
|
|
goto done;
|
|
|
|
if (strlen(name) > 31)
|
|
goto fail;
|
|
strcpy(s, name);
|
|
for (p = s; *p; p++)
|
|
if (*p == '/')
|
|
*p = '!';
|
|
res = blk_lookup_devt(s, 0);
|
|
if (res)
|
|
goto done;
|
|
|
|
/*
|
|
* try non-existant, but valid partition, which may only exist
|
|
* after revalidating the disk, like partitioned md devices
|
|
*/
|
|
while (p > s && isdigit(p[-1]))
|
|
p--;
|
|
if (p == s || !*p || *p == '0')
|
|
goto fail;
|
|
|
|
/* try disk name without <part number> */
|
|
part = simple_strtoul(p, NULL, 10);
|
|
*p = '\0';
|
|
res = blk_lookup_devt(s, part);
|
|
if (res)
|
|
goto done;
|
|
|
|
/* try disk name without p<part number> */
|
|
if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
|
|
goto fail;
|
|
p[-1] = '\0';
|
|
res = blk_lookup_devt(s, part);
|
|
if (res)
|
|
goto done;
|
|
|
|
fail:
|
|
return 0;
|
|
done:
|
|
return res;
|
|
}
|
|
|
|
static int __init root_dev_setup(char *line)
|
|
{
|
|
strlcpy(saved_root_name, line, sizeof(saved_root_name));
|
|
return 1;
|
|
}
|
|
|
|
__setup("root=", root_dev_setup);
|
|
|
|
static int __init rootwait_setup(char *str)
|
|
{
|
|
if (*str)
|
|
return 0;
|
|
root_wait = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("rootwait", rootwait_setup);
|
|
|
|
static char * __initdata root_mount_data;
|
|
static int __init root_data_setup(char *str)
|
|
{
|
|
root_mount_data = str;
|
|
return 1;
|
|
}
|
|
|
|
static char * __initdata root_fs_names;
|
|
static int __init fs_names_setup(char *str)
|
|
{
|
|
root_fs_names = str;
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int __initdata root_delay;
|
|
static int __init root_delay_setup(char *str)
|
|
{
|
|
root_delay = simple_strtoul(str, NULL, 0);
|
|
return 1;
|
|
}
|
|
|
|
__setup("rootflags=", root_data_setup);
|
|
__setup("rootfstype=", fs_names_setup);
|
|
__setup("rootdelay=", root_delay_setup);
|
|
|
|
static void __init get_fs_names(char *page)
|
|
{
|
|
char *s = page;
|
|
|
|
if (root_fs_names) {
|
|
strcpy(page, root_fs_names);
|
|
while (*s++) {
|
|
if (s[-1] == ',')
|
|
s[-1] = '\0';
|
|
}
|
|
} else {
|
|
int len = get_filesystem_list(page);
|
|
char *p, *next;
|
|
|
|
page[len] = '\0';
|
|
for (p = page-1; p; p = next) {
|
|
next = strchr(++p, '\n');
|
|
if (*p++ != '\t')
|
|
continue;
|
|
while ((*s++ = *p++) != '\n')
|
|
;
|
|
s[-1] = '\0';
|
|
}
|
|
}
|
|
*s = '\0';
|
|
}
|
|
|
|
static int __init do_mount_root(char *name, char *fs, int flags, void *data)
|
|
{
|
|
int err = sys_mount(name, "/root", fs, flags, data);
|
|
if (err)
|
|
return err;
|
|
|
|
sys_chdir("/root");
|
|
ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
|
|
printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
|
|
current->fs->pwd.mnt->mnt_sb->s_type->name,
|
|
current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
|
|
" readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
|
|
return 0;
|
|
}
|
|
|
|
void __init mount_block_root(char *name, int flags)
|
|
{
|
|
char *fs_names = __getname();
|
|
char *p;
|
|
#ifdef CONFIG_BLOCK
|
|
char b[BDEVNAME_SIZE];
|
|
#else
|
|
const char *b = name;
|
|
#endif
|
|
|
|
get_fs_names(fs_names);
|
|
retry:
|
|
for (p = fs_names; *p; p += strlen(p)+1) {
|
|
int err = do_mount_root(name, p, flags, root_mount_data);
|
|
switch (err) {
|
|
case 0:
|
|
goto out;
|
|
case -EACCES:
|
|
flags |= MS_RDONLY;
|
|
goto retry;
|
|
case -EINVAL:
|
|
continue;
|
|
}
|
|
/*
|
|
* Allow the user to distinguish between failed sys_open
|
|
* and bad superblock on root device.
|
|
* and give them a list of the available devices
|
|
*/
|
|
#ifdef CONFIG_BLOCK
|
|
__bdevname(ROOT_DEV, b);
|
|
#endif
|
|
printk("VFS: Cannot open root device \"%s\" or %s\n",
|
|
root_device_name, b);
|
|
printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
|
|
|
|
printk_all_partitions();
|
|
#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
|
|
printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
|
|
"explicit textual name for \"root=\" boot option.\n");
|
|
#endif
|
|
panic("VFS: Unable to mount root fs on %s", b);
|
|
}
|
|
|
|
printk("List of all partitions:\n");
|
|
printk_all_partitions();
|
|
printk("No filesystem could mount root, tried: ");
|
|
for (p = fs_names; *p; p += strlen(p)+1)
|
|
printk(" %s", p);
|
|
printk("\n");
|
|
#ifdef CONFIG_BLOCK
|
|
__bdevname(ROOT_DEV, b);
|
|
#endif
|
|
panic("VFS: Unable to mount root fs on %s", b);
|
|
out:
|
|
putname(fs_names);
|
|
}
|
|
|
|
#ifdef CONFIG_ROOT_NFS
|
|
static int __init mount_nfs_root(void)
|
|
{
|
|
void *data = nfs_root_data();
|
|
|
|
create_dev("/dev/root", ROOT_DEV);
|
|
if (data &&
|
|
do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
|
|
void __init change_floppy(char *fmt, ...)
|
|
{
|
|
struct termios termios;
|
|
char buf[80];
|
|
char c;
|
|
int fd;
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
vsprintf(buf, fmt, args);
|
|
va_end(args);
|
|
fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
|
|
if (fd >= 0) {
|
|
sys_ioctl(fd, FDEJECT, 0);
|
|
sys_close(fd);
|
|
}
|
|
printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
|
|
fd = sys_open("/dev/console", O_RDWR, 0);
|
|
if (fd >= 0) {
|
|
sys_ioctl(fd, TCGETS, (long)&termios);
|
|
termios.c_lflag &= ~ICANON;
|
|
sys_ioctl(fd, TCSETSF, (long)&termios);
|
|
sys_read(fd, &c, 1);
|
|
termios.c_lflag |= ICANON;
|
|
sys_ioctl(fd, TCSETSF, (long)&termios);
|
|
sys_close(fd);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void __init mount_root(void)
|
|
{
|
|
#ifdef CONFIG_ROOT_NFS
|
|
if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
|
|
if (mount_nfs_root())
|
|
return;
|
|
|
|
printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
|
|
ROOT_DEV = Root_FD0;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_BLK_DEV_FD
|
|
if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
|
|
/* rd_doload is 2 for a dual initrd/ramload setup */
|
|
if (rd_doload==2) {
|
|
if (rd_load_disk(1)) {
|
|
ROOT_DEV = Root_RAM1;
|
|
root_device_name = NULL;
|
|
}
|
|
} else
|
|
change_floppy("root floppy");
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_BLOCK
|
|
create_dev("/dev/root", ROOT_DEV);
|
|
mount_block_root("/dev/root", root_mountflags);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
|
|
*/
|
|
void __init prepare_namespace(void)
|
|
{
|
|
int is_floppy;
|
|
|
|
if (root_delay) {
|
|
printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
|
|
root_delay);
|
|
ssleep(root_delay);
|
|
}
|
|
|
|
/*
|
|
* wait for the known devices to complete their probing
|
|
*
|
|
* Note: this is a potential source of long boot delays.
|
|
* For example, it is not atypical to wait 5 seconds here
|
|
* for the touchpad of a laptop to initialize.
|
|
*/
|
|
wait_for_device_probe();
|
|
|
|
md_run_setup();
|
|
|
|
if (saved_root_name[0]) {
|
|
root_device_name = saved_root_name;
|
|
if (!strncmp(root_device_name, "mtd", 3) ||
|
|
!strncmp(root_device_name, "ubi", 3)) {
|
|
mount_block_root(root_device_name, root_mountflags);
|
|
goto out;
|
|
}
|
|
ROOT_DEV = name_to_dev_t(root_device_name);
|
|
if (strncmp(root_device_name, "/dev/", 5) == 0)
|
|
root_device_name += 5;
|
|
}
|
|
|
|
if (initrd_load())
|
|
goto out;
|
|
|
|
/* wait for any asynchronous scanning to complete */
|
|
if ((ROOT_DEV == 0) && root_wait) {
|
|
printk(KERN_INFO "Waiting for root device %s...\n",
|
|
saved_root_name);
|
|
while (driver_probe_done() != 0 ||
|
|
(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
|
|
msleep(100);
|
|
async_synchronize_full();
|
|
}
|
|
|
|
is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
|
|
|
|
if (is_floppy && rd_doload && rd_load_disk(0))
|
|
ROOT_DEV = Root_RAM0;
|
|
|
|
mount_root();
|
|
out:
|
|
sys_mount(".", "/", NULL, MS_MOVE, NULL);
|
|
sys_chroot(".");
|
|
}
|
|
|