[net-next-2.6.git] / init / do_mounts.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/mount.h>
#include <linux/device.h>

#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
#include <linux/nfs_mount.h>

#include "do_mounts.h"

extern int get_filesystem_list(char * buf);

int __initdata rd_doload;	/* 1 = load RAM disk, 0 = don't load */

int root_mountflags = MS_RDONLY | MS_SILENT;
char * __initdata root_device_name;
static char __initdata saved_root_name[64];

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);

static dev_t try_name(char *name, int part)
{
	char path[64];
	char buf[32];
	int range;
	dev_t res;
	char *s;
	int len;
	int fd;
	unsigned int maj, min;

	/* read device number from .../dev */

	sprintf(path, "/sys/block/%s/dev", name);
	fd = sys_open(path, 0, 0);
	if (fd < 0)
		goto fail;
	len = sys_read(fd, buf, 32);
	sys_close(fd);
	if (len <= 0 || len == 32 || buf[len - 1] != '\n')
		goto fail;
	buf[len - 1] = '\0';
	if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
		/*
		 * Try the %u:%u format -- see print_dev_t()
		 */
		res = MKDEV(maj, min);
		if (maj != MAJOR(res) || min != MINOR(res))
			goto fail;
	} else {
		/*
		 * Nope.  Try old-style "0321"
		 */
		res = new_decode_dev(simple_strtoul(buf, &s, 16));
		if (*s)
			goto fail;
	}

	/* if it's there and we are not looking for a partition - that's it */
	if (!part)
		return res;

	/* otherwise read range from .../range */
	sprintf(path, "/sys/block/%s/range", name);
	fd = sys_open(path, 0, 0);
	if (fd < 0)
		goto fail;
	len = sys_read(fd, buf, 32);
	sys_close(fd);
	if (len <= 0 || len == 32 || buf[len - 1] != '\n')
		goto fail;
	buf[len - 1] = '\0';
	range = simple_strtoul(buf, &s, 10);
	if (*s)
		goto fail;

	/* if partition is within range - we got it */
	if (part < range)
		return res + part;
fail:
	return 0;
}

/*
 *	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.
 *	Sysfs is used to check if something is a disk name - it has
 *	all known disks under bus/block/devices.  If the disk name
 *	contains slashes, name of sysfs node has them replaced with
 *	bangs.  try_name() does the actual checks, assuming that sysfs
 *	is mounted on rootfs /sys.
 */

dev_t name_to_dev_t(char *name)
{
	char s[32];
	char *p;
	dev_t res = 0;
	int part;

#ifdef CONFIG_SYSFS
	int mkdir_err = sys_mkdir("/sys", 0700);
	if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
		goto out;
#endif

	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 = try_name(s, 0);
	if (res)
		goto done;

	while (p > s && isdigit(p[-1]))
		p--;
	if (p == s || !*p || *p == '0')
		goto fail;
	part = simple_strtoul(p, NULL, 10);
	*p = '\0';
	res = try_name(s, part);
	if (res)
		goto done;

	if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
		goto fail;
	p[-1] = '\0';
	res = try_name(s, part);
done:
#ifdef CONFIG_SYSFS
	sys_umount("/sys", 0);
out:
	if (!mkdir_err)
		sys_rmdir("/sys");
#endif
	return res;
fail:
	res = 0;
	goto done;
}

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 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->pwdmnt->mnt_sb->s_dev;
	printk("VFS: Mounted root (%s filesystem)%s.\n",
	       current->fs->pwdmnt->mnt_sb->s_type->name,
	       current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? 
	       " readonly" : "");
	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.
		 */
#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\n");

		panic("VFS: Unable to mount root fs on %s", b);
	}

	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 */
	while (driver_probe_done() != 0)
		msleep(100);

	md_run_setup();

	if (saved_root_name[0]) {
		root_device_name = saved_root_name;
		if (!strncmp(root_device_name, "mtd", 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;
	}

	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;

	if (initrd_load())
		goto out;

	if (is_floppy && rd_doload && rd_load_disk(0))
		ROOT_DEV = Root_RAM0;

	mount_root();
out:
	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	sys_chroot(".");
	security_sb_post_mountroot();
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/module.h>
	2	#include <linux/sched.h>
	3	#include <linux/ctype.h>
	4	#include <linux/fd.h>
	5	#include <linux/tty.h>
	6	#include <linux/suspend.h>
	7	#include <linux/root_dev.h>
	8	#include <linux/security.h>
	9	#include <linux/delay.h>
d53d9f16	10	#include <linux/mount.h>
d779249e	11	#include <linux/device.h>
1da177e4 LT	12
	13	#include <linux/nfs_fs.h>
	14	#include <linux/nfs_fs_sb.h>
	15	#include <linux/nfs_mount.h>
	16
	17	#include "do_mounts.h"
	18
	19	extern int get_filesystem_list(char * buf);
	20
	21	int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
	22
9b04c997	23	int root_mountflags = MS_RDONLY \| MS_SILENT;
1da177e4 LT	24	char * __initdata root_device_name;
	25	static char __initdata saved_root_name[64];
	26
1da177e4 LT	27	dev_t ROOT_DEV;
1da177e4 LT	28
1da177e4 LT	29	static int __init load_ramdisk(char *str)
	30	{
	31	rd_doload = simple_strtol(str,NULL,0) & 3;
	32	return 1;
	33	}
	34	__setup("load_ramdisk=", load_ramdisk);
	35
	36	static int __init readonly(char *str)
	37	{
	38	if (*str)
	39	return 0;
	40	root_mountflags \|= MS_RDONLY;
	41	return 1;
	42	}
	43
	44	static int __init readwrite(char *str)
	45	{
	46	if (*str)
	47	return 0;
	48	root_mountflags &= ~MS_RDONLY;
	49	return 1;
	50	}
	51
	52	__setup("ro", readonly);
	53	__setup("rw", readwrite);
	54
	55	static dev_t try_name(char *name, int part)
	56	{
	57	char path[64];
	58	char buf[32];
	59	int range;
	60	dev_t res;
	61	char *s;
	62	int len;
	63	int fd;
	64	unsigned int maj, min;
	65
	66	/* read device number from .../dev */
	67
	68	sprintf(path, "/sys/block/%s/dev", name);
	69	fd = sys_open(path, 0, 0);
	70	if (fd < 0)
	71	goto fail;
	72	len = sys_read(fd, buf, 32);
	73	sys_close(fd);
	74	if (len <= 0 \|\| len == 32 \|\| buf[len - 1] != '\n')
	75	goto fail;
	76	buf[len - 1] = '\0';
	77	if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
	78	/*
	79	* Try the %u:%u format -- see print_dev_t()
	80	*/
	81	res = MKDEV(maj, min);
	82	if (maj != MAJOR(res) \|\| min != MINOR(res))
	83	goto fail;
	84	} else {
	85	/*
	86	* Nope. Try old-style "0321"
	87	*/
	88	res = new_decode_dev(simple_strtoul(buf, &s, 16));
	89	if (*s)
	90	goto fail;
	91	}
	92
93	/* if it's there and we are not looking for a partition - that's it */
94	if (!part)
95	return res;
96
97	/* otherwise read range from .../range */
98	sprintf(path, "/sys/block/%s/range", name);
99	fd = sys_open(path, 0, 0);
100	if (fd < 0)
101	goto fail;
102	len = sys_read(fd, buf, 32);
103	sys_close(fd);
104	if (len <= 0 \|\| len == 32 \|\| buf[len - 1] != '\n')
105	goto fail;
106	buf[len - 1] = '\0';
107	range = simple_strtoul(buf, &s, 10);
108	if (*s)
109	goto fail;
110
111	/* if partition is within range - we got it */
112	if (part < range)
113	return res + part;
114	fail:
115	return 0;
116	}
117
118	/*
119	* Convert a name into device number. We accept the following variants:
120	*
121	* 1) device number in hexadecimal represents itself
122	* 2) /dev/nfs represents Root_NFS (0xff)
123	* 3) /dev/<disk_name> represents the device number of disk
124	* 4) /dev/<disk_name><decimal> represents the device number
125	* of partition - device number of disk plus the partition number
126	* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
127	* used when disk name of partitioned disk ends on a digit.
128	*
129	* If name doesn't have fall into the categories above, we return 0.
13ae6d81	130	* Sysfs is used to check if something is a disk name - it has
1da177e4	131	* all known disks under bus/block/devices. If the disk name
13ae6d81 REB	132	* contains slashes, name of sysfs node has them replaced with
13ae6d81 REB	133	* bangs. try_name() does the actual checks, assuming that sysfs
1da177e4 LT	134	* is mounted on rootfs /sys.
	135	*/
	136
	137	dev_t name_to_dev_t(char *name)
	138	{
	139	char s[32];
	140	char *p;
	141	dev_t res = 0;
	142	int part;
	143
	144	#ifdef CONFIG_SYSFS
	145	int mkdir_err = sys_mkdir("/sys", 0700);
	146	if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
	147	goto out;
	148	#endif
	149
	150	if (strncmp(name, "/dev/", 5) != 0) {
	151	unsigned maj, min;
	152
	153	if (sscanf(name, "%u:%u", &maj, &min) == 2) {
	154	res = MKDEV(maj, min);
	155	if (maj != MAJOR(res) \|\| min != MINOR(res))
	156	goto fail;
	157	} else {
	158	res = new_decode_dev(simple_strtoul(name, &p, 16));
	159	if (*p)
	160	goto fail;
	161	}
	162	goto done;
	163	}
	164	name += 5;
	165	res = Root_NFS;
	166	if (strcmp(name, "nfs") == 0)
	167	goto done;
	168	res = Root_RAM0;
	169	if (strcmp(name, "ram") == 0)
	170	goto done;
	171
	172	if (strlen(name) > 31)
	173	goto fail;
	174	strcpy(s, name);
	175	for (p = s; *p; p++)
	176	if (*p == '/')
	177	*p = '!';
	178	res = try_name(s, 0);
	179	if (res)
	180	goto done;
	181
	182	while (p > s && isdigit(p[-1]))
	183	p--;
	184	if (p == s \|\| !p \|\| p == '0')
	185	goto fail;
	186	part = simple_strtoul(p, NULL, 10);
	187	*p = '\0';
	188	res = try_name(s, part);
	189	if (res)
	190	goto done;
	191
	192	if (p < s + 2 \|\| !isdigit(p[-2]) \|\| p[-1] != 'p')
	193	goto fail;
	194	p[-1] = '\0';
	195	res = try_name(s, part);
	196	done:
	197	#ifdef CONFIG_SYSFS
198	sys_umount("/sys", 0);
199	out:
200	if (!mkdir_err)
201	sys_rmdir("/sys");
202	#endif
203	return res;
204	fail:
205	res = 0;
206	goto done;
207	}
208
209	static int __init root_dev_setup(char *line)
210	{
211	strlcpy(saved_root_name, line, sizeof(saved_root_name));
212	return 1;
213	}
214
215	__setup("root=", root_dev_setup);
216
217	static char * __initdata root_mount_data;
218	static int __init root_data_setup(char *str)
219	{
220	root_mount_data = str;
221	return 1;
222	}
223
224	static char * __initdata root_fs_names;
225	static int __init fs_names_setup(char *str)
226	{
227	root_fs_names = str;
228	return 1;
229	}
230
231	static unsigned int __initdata root_delay;
232	static int __init root_delay_setup(char *str)
233	{
234	root_delay = simple_strtoul(str, NULL, 0);
235	return 1;
236	}
237
238	__setup("rootflags=", root_data_setup);
239	__setup("rootfstype=", fs_names_setup);
240	__setup("rootdelay=", root_delay_setup);
241
242	static void __init get_fs_names(char *page)
243	{
244	char *s = page;
245
246	if (root_fs_names) {
247	strcpy(page, root_fs_names);
248	while (*s++) {
249	if (s[-1] == ',')
250	s[-1] = '\0';
251	}
252	} else {
253	int len = get_filesystem_list(page);
254	char p, next;
255
256	page[len] = '\0';
257	for (p = page-1; p; p = next) {
258	next = strchr(++p, '\n');
259	if (*p++ != '\t')
260	continue;
261	while ((s++ = p++) != '\n')
262	;
263	s[-1] = '\0';
264	}
265	}
266	*s = '\0';
267	}
268
269	static int __init do_mount_root(char name, char fs, int flags, void *data)
270	{
271	int err = sys_mount(name, "/root", fs, flags, data);
272	if (err)
273	return err;
274
275	sys_chdir("/root");
276	ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
277	printk("VFS: Mounted root (%s filesystem)%s.\n",
278	current->fs->pwdmnt->mnt_sb->s_type->name,
279	current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
280	" readonly" : "");
281	return 0;
282	}
283
284	void __init mount_block_root(char *name, int flags)
285	{
286	char *fs_names = __getname();
287	char *p;
9361401e	288	#ifdef CONFIG_BLOCK
1da177e4	289	char b[BDEVNAME_SIZE];
9361401e DH	290	#else
	291	const char *b = name;
	292	#endif
1da177e4 LT	293
	294	get_fs_names(fs_names);
	295	retry:
	296	for (p = fs_names; *p; p += strlen(p)+1) {
	297	int err = do_mount_root(name, p, flags, root_mount_data);
	298	switch (err) {
	299	case 0:
	300	goto out;
	301	case -EACCES:
	302	flags \|= MS_RDONLY;
	303	goto retry;
	304	case -EINVAL:
	305	continue;
	306	}
	307	/*
	308	* Allow the user to distinguish between failed sys_open
	309	* and bad superblock on root device.
	310	*/
9361401e	311	#ifdef CONFIG_BLOCK
1da177e4	312	__bdevname(ROOT_DEV, b);
9361401e	313	#endif
1da177e4 LT	314	printk("VFS: Cannot open root device \"%s\" or %s\n",
	315	root_device_name, b);
	316	printk("Please append a correct \"root=\" boot option\n");
	317
	318	panic("VFS: Unable to mount root fs on %s", b);
	319	}
be6e028b AW	320
	321	printk("No filesystem could mount root, tried: ");
	322	for (p = fs_names; *p; p += strlen(p)+1)
	323	printk(" %s", p);
	324	printk("\n");
9361401e DH	325	#ifdef CONFIG_BLOCK
	326	__bdevname(ROOT_DEV, b);
	327	#endif
	328	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	329	out:
	330	putname(fs_names);
	331	}
	332
	333	#ifdef CONFIG_ROOT_NFS
	334	static int __init mount_nfs_root(void)
	335	{
	336	void *data = nfs_root_data();
	337
bdaf8529	338	create_dev("/dev/root", ROOT_DEV);
1da177e4 LT	339	if (data &&
	340	do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
	341	return 1;
	342	return 0;
	343	}
	344	#endif
	345
	346	#if defined(CONFIG_BLK_DEV_RAM) \|\| defined(CONFIG_BLK_DEV_FD)
	347	void __init change_floppy(char *fmt, ...)
	348	{
	349	struct termios termios;
	350	char buf[80];
	351	char c;
	352	int fd;
	353	va_list args;
	354	va_start(args, fmt);
	355	vsprintf(buf, fmt, args);
	356	va_end(args);
	357	fd = sys_open("/dev/root", O_RDWR \| O_NDELAY, 0);
	358	if (fd >= 0) {
	359	sys_ioctl(fd, FDEJECT, 0);
	360	sys_close(fd);
	361	}
	362	printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
	363	fd = sys_open("/dev/console", O_RDWR, 0);
	364	if (fd >= 0) {
	365	sys_ioctl(fd, TCGETS, (long)&termios);
	366	termios.c_lflag &= ~ICANON;
	367	sys_ioctl(fd, TCSETSF, (long)&termios);
	368	sys_read(fd, &c, 1);
	369	termios.c_lflag \|= ICANON;
	370	sys_ioctl(fd, TCSETSF, (long)&termios);
	371	sys_close(fd);
	372	}
	373	}
	374	#endif
	375
	376	void __init mount_root(void)
	377	{
	378	#ifdef CONFIG_ROOT_NFS
	379	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
	380	if (mount_nfs_root())
	381	return;
	382
	383	printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
	384	ROOT_DEV = Root_FD0;
	385	}
	386	#endif
	387	#ifdef CONFIG_BLK_DEV_FD
	388	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
	389	/* rd_doload is 2 for a dual initrd/ramload setup */
	390	if (rd_doload==2) {
	391	if (rd_load_disk(1)) {
	392	ROOT_DEV = Root_RAM1;
	393	root_device_name = NULL;
	394	}
	395	} else
	396	change_floppy("root floppy");
	397	}
	398	#endif
9361401e	399	#ifdef CONFIG_BLOCK
bdaf8529	400	create_dev("/dev/root", ROOT_DEV);
1da177e4	401	mount_block_root("/dev/root", root_mountflags);
9361401e	402	#endif
1da177e4 LT	403	}
	404
	405	/*
	406	* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
	407	*/
	408	void __init prepare_namespace(void)
	409	{
	410	int is_floppy;
	411
1da177e4 LT	412	if (root_delay) {
	413	printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
	414	root_delay);
	415	ssleep(root_delay);
	416	}
	417
d779249e GKH	418	/* wait for the known devices to complete their probing */
	419	while (driver_probe_done() != 0)
	420	msleep(100);
	421
1da177e4 LT	422	md_run_setup();
	423
	424	if (saved_root_name[0]) {
	425	root_device_name = saved_root_name;
e9482b43 JE	426	if (!strncmp(root_device_name, "mtd", 3)) {
	427	mount_block_root(root_device_name, root_mountflags);
	428	goto out;
	429	}
1da177e4 LT	430	ROOT_DEV = name_to_dev_t(root_device_name);
	431	if (strncmp(root_device_name, "/dev/", 5) == 0)
	432	root_device_name += 5;
	433	}
	434
	435	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
	436
	437	if (initrd_load())
	438	goto out;
	439
	440	if (is_floppy && rd_doload && rd_load_disk(0))
	441	ROOT_DEV = Root_RAM0;
	442
	443	mount_root();
	444	out:
1da177e4 LT	445	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	446	sys_chroot(".");
	447	security_sb_post_mountroot();
1da177e4 LT	448	}
1da177e4 LT	449