static int __init mount_cramfs_linear_root(void)
{
create_dev("/dev/root", ROOT_DEV, root_device_name);
if (do_mount_root("/dev/root","cramfs",root_mountflags,root_mount_data) == 0)
return 1;
return 0;
}
void __init mount_block_root(char *name, int flags)
{
struct page *page = alloc_page(GFP_KERNEL |
__GFP_NOTRACK_FALSE_POSITIVE);
char *fs_names = page_address(page);
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:
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: error %d\n",
root_device_name, b, err);
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);
}
if (!(flags & MS_RDONLY)) {
flags |= MS_RDONLY;
goto retry;
}
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:
put_page(page);
}
void __init mount_block_root(char *name, int flags)
{
char *fs_names = __getname();
char *p;
char b[BDEVNAME_SIZE];
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.
*/
__bdevname(ROOT_DEV, b);
printk("VFS: Cannot open root device \"%s\" or %s\n",
root_device_name, b);
printk("Please append a correct \"root=\" boot option\n");
panic("VFS: Unable to mount root fs on %s", b);
}
panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
out:
putname(fs_names);
}
static int __init mount_nfs_root(void)
{
void *data = nfs_root_data();
create_dev("/dev/root", ROOT_DEV, NULL);
if (data &&
do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
return 1;
return 0;
}
static int __init mount_nfs_root(void)
{
char *root_dev, *root_data;
if (nfs_root_data(&root_dev, &root_data) != 0)
return 0;
if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
return 0;
return 1;
}
int change_root(kdev_t new_root_dev,const char *put_old)
{
kdev_t old_root_dev;
struct vfsmount *vfsmnt;
struct inode *old_root,*old_pwd,*inode;
unsigned long old_fs;
int error;
old_root = current->fs->root;
old_pwd = current->fs->pwd;
old_root_dev = ROOT_DEV;
if (!fs_may_mount(new_root_dev)) {
printk(KERN_CRIT "New root is busy. Staying in initrd.\n");
return -EBUSY;
}
ROOT_DEV = new_root_dev;
do_mount_root();
old_fs = get_fs();
set_fs(get_ds());
error = namei(put_old,&inode);
if (error) inode = NULL;
set_fs(old_fs);
if (!error && (inode->i_count != 1 || inode->i_mount)) error = -EBUSY;
if (!error && !S_ISDIR(inode->i_mode)) error = -ENOTDIR;
iput(old_root); /* current->fs->root */
iput(old_pwd); /* current->fs->pwd */
if (error) {
int umount_error;
if (inode) iput(inode);
printk(KERN_NOTICE "Trying to unmount old root ... ");
old_root->i_mount = old_root;
/* does this belong into do_mount_root ? */
umount_error = do_umount(old_root_dev,1);
if (umount_error) printk(KERN_ERR "error %d\n",umount_error);
else {
printk(KERN_NOTICE "okay\n");
invalidate_buffers(old_root_dev);
}
return umount_error ? error : 0;
}
iput(old_root); /* sb->s_covered */
remove_vfsmnt(old_root_dev);
vfsmnt = add_vfsmnt(old_root_dev,"old_rootfs",put_old);
if (!vfsmnt) printk(KERN_CRIT "Trouble: add_vfsmnt failed\n");
else {
vfsmnt->mnt_sb = old_root->i_sb;
vfsmnt->mnt_sb->s_covered = inode;
vfsmnt->mnt_flags = vfsmnt->mnt_sb->s_flags;
}
inode->i_mount = old_root;
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();
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);
}
static int __init mount_ubi_rootfs(void)
{
int flags = MS_SILENT;
int err, tried = 0;
while (tried < 2) {
err = do_mount_root("ubi0:rootfs", "ubifs", flags, \
root_mount_data);
switch (err) {
case -EACCES:
flags |= MS_RDONLY;
tried++;
default:
return err;
}
}
return -EINVAL;
}
static int __init mount_nfs_root(void)
{
char *root_dev, *root_data;
unsigned int timeout;
int try, err;
err = nfs_root_data(&root_dev, &root_data);
if (err != 0)
return 0;
/*
* The server or network may not be ready, so try several
* times. Stop after a few tries in case the client wants
* to fall back to other boot methods.
*/
timeout = NFSROOT_TIMEOUT_MIN;
for (try = 1; ; try++) {
err = do_mount_root(root_dev, "nfs",
root_mountflags, root_data);
if (err == 0)
return 1;
if (try > NFSROOT_RETRY_MAX)
break;
/* Wait, in case the server refused us immediately */
ssleep(timeout);
timeout <<= 1;
if (timeout > NFSROOT_TIMEOUT_MAX)
timeout = NFSROOT_TIMEOUT_MAX;
}
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 (ROOT_DEV == Root_NFS) {
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:
devtmpfs_mount("dev");
sys_mount(".", "/", NULL, MS_MOVE, NULL);
sys_chroot(".");
}
void mount_root(void)
{
memset(super_blocks, 0, sizeof(super_blocks));
do_mount_root();
}
