[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/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/slab.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);

#ifdef CONFIG_BLOCK
/**
 * match_dev_by_uuid - callback for finding a partition using its uuid
 * @dev:	device passed in by the caller
 * @data:	opaque pointer to a 36 byte char array with a UUID
 *
 * Returns 1 if the device matches, and 0 otherwise.
 */
static int match_dev_by_uuid(struct device *dev, void *data)
{
	u8 *uuid = data;
	struct hd_struct *part = dev_to_part(dev);

	if (!part->info)
		goto no_match;

	if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid)))
			goto no_match;

	return 1;
no_match:
	return 0;
}


/**
 * devt_from_partuuid - looks up the dev_t of a partition by its UUID
 * @uuid:	36 byte char array containing a hex ascii UUID
 *
 * The function will return the first partition which contains a matching
 * UUID value in its partition_meta_info struct.  This does not search
 * by filesystem UUIDs.
 *
 * Returns the matching dev_t on success or 0 on failure.
 */
static dev_t __init devt_from_partuuid(char *uuid_str)
{
	dev_t res = 0;
	struct device *dev = NULL;
	u8 uuid[16];

	/* Pack the requested UUID in the expected format. */
	part_pack_uuid(uuid_str, uuid);

	dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid);
	if (!dev)
		goto done;

	res = dev->devt;
	put_device(dev);

done:
	return res;
}
#endif

/*
 *	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.
 *	6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
 *	   unique id of a partition if the partition table provides it.
 *
 *	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;

#ifdef CONFIG_BLOCK
	if (strncmp(name, "PARTUUID=", 9) == 0) {
		name += 9;
		if (strlen(name) != 36)
			goto fail;
		res = devt_from_partuuid(name);
		if (!res)
			goto fail;
		goto done;
	}
#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 = 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((const char __user __force *)"/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_gfp(GFP_KERNEL
		| __GFP_NOTRACK_FALSE_POSITIVE);
	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)
{
	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;
}
#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:
	devtmpfs_mount("dev");
	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	sys_chroot((const char __user __force *)".");
}
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>
dd2a345f	10	#include <linux/genhd.h>
d53d9f16	11	#include <linux/mount.h>
d779249e	12	#include <linux/device.h>
46595390	13	#include <linux/init.h>
011e3fcd	14	#include <linux/fs.h>
82c8253a	15	#include <linux/initrd.h>
22a9d645	16	#include <linux/async.h>
5ad4e53b	17	#include <linux/fs_struct.h>
5a0e3ad6	18	#include <linux/slab.h>
1da177e4 LT	19
	20	#include <linux/nfs_fs.h>
	21	#include <linux/nfs_fs_sb.h>
	22	#include <linux/nfs_mount.h>
	23
	24	#include "do_mounts.h"
	25
1da177e4 LT	26	int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
1da177e4 LT	27
9b04c997	28	int root_mountflags = MS_RDONLY \| MS_SILENT;
f56f6d30	29	static char * __initdata root_device_name;
1da177e4	30	static char __initdata saved_root_name[64];
cc1ed754	31	static int __initdata root_wait;
1da177e4	32
1da177e4 LT	33	dev_t ROOT_DEV;
1da177e4 LT	34
1da177e4 LT	35	static int __init load_ramdisk(char *str)
	36	{
	37	rd_doload = simple_strtol(str,NULL,0) & 3;
	38	return 1;
	39	}
	40	__setup("load_ramdisk=", load_ramdisk);
	41
	42	static int __init readonly(char *str)
	43	{
	44	if (*str)
	45	return 0;
	46	root_mountflags \|= MS_RDONLY;
	47	return 1;
	48	}
	49
	50	static int __init readwrite(char *str)
	51	{
	52	if (*str)
	53	return 0;
	54	root_mountflags &= ~MS_RDONLY;
	55	return 1;
	56	}
	57
	58	__setup("ro", readonly);
	59	__setup("rw", readwrite);
	60
6d0aed7a	61	#ifdef CONFIG_BLOCK
b5af921e WD	62	/**
	63	* match_dev_by_uuid - callback for finding a partition using its uuid
	64	* @dev: device passed in by the caller
	65	* @data: opaque pointer to a 36 byte char array with a UUID
	66	*
	67	* Returns 1 if the device matches, and 0 otherwise.
	68	*/
38b6f45a	69	static int match_dev_by_uuid(struct device dev, void data)
b5af921e WD	70	{
	71	u8 *uuid = data;
	72	struct hd_struct *part = dev_to_part(dev);
	73
	74	if (!part->info)
	75	goto no_match;
	76
	77	if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid)))
	78	goto no_match;
	79
	80	return 1;
	81	no_match:
	82	return 0;
	83	}
	84
	85
	86	/**
	87	* devt_from_partuuid - looks up the dev_t of a partition by its UUID
	88	* @uuid: 36 byte char array containing a hex ascii UUID
	89	*
	90	* The function will return the first partition which contains a matching
	91	* UUID value in its partition_meta_info struct. This does not search
	92	* by filesystem UUIDs.
	93	*
	94	* Returns the matching dev_t on success or 0 on failure.
	95	*/
	96	static dev_t __init devt_from_partuuid(char *uuid_str)
	97	{
	98	dev_t res = 0;
	99	struct device *dev = NULL;
	100	u8 uuid[16];
	101
	102	/* Pack the requested UUID in the expected format. */
	103	part_pack_uuid(uuid_str, uuid);
	104
	105	dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid);
	106	if (!dev)
	107	goto done;
	108
	109	res = dev->devt;
	110	put_device(dev);
	111
	112	done:
	113	return res;
	114	}
6d0aed7a	115	#endif
b5af921e	116
1da177e4 LT	117	/*
	118	* Convert a name into device number. We accept the following variants:
	119	*
	120	* 1) device number in hexadecimal represents itself
	121	* 2) /dev/nfs represents Root_NFS (0xff)
	122	* 3) /dev/<disk_name> represents the device number of disk
	123	* 4) /dev/<disk_name><decimal> represents the device number
	124	* of partition - device number of disk plus the partition number
	125	* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
	126	* used when disk name of partitioned disk ends on a digit.
b5af921e WD	127	* 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
b5af921e WD	128	* unique id of a partition if the partition table provides it.
1da177e4	129	*
edfaa7c3 KS	130	* If name doesn't have fall into the categories above, we return (0,0).
	131	* block_class is used to check if something is a disk name. If the disk
	132	* name contains slashes, the device name has them replaced with
	133	* bangs.
1da177e4 LT	134	*/
	135
	136	dev_t name_to_dev_t(char *name)
	137	{
	138	char s[32];
	139	char *p;
	140	dev_t res = 0;
30f2f0eb	141	int part;
1da177e4	142
6d0aed7a	143	#ifdef CONFIG_BLOCK
b5af921e WD	144	if (strncmp(name, "PARTUUID=", 9) == 0) {
	145	name += 9;
	146	if (strlen(name) != 36)
	147	goto fail;
	148	res = devt_from_partuuid(name);
	149	if (!res)
	150	goto fail;
	151	goto done;
	152	}
6d0aed7a	153	#endif
b5af921e	154
1da177e4 LT	155	if (strncmp(name, "/dev/", 5) != 0) {
	156	unsigned maj, min;
	157
	158	if (sscanf(name, "%u:%u", &maj, &min) == 2) {
	159	res = MKDEV(maj, min);
	160	if (maj != MAJOR(res) \|\| min != MINOR(res))
	161	goto fail;
	162	} else {
	163	res = new_decode_dev(simple_strtoul(name, &p, 16));
	164	if (*p)
	165	goto fail;
	166	}
	167	goto done;
	168	}
edfaa7c3	169
1da177e4 LT	170	name += 5;
	171	res = Root_NFS;
	172	if (strcmp(name, "nfs") == 0)
	173	goto done;
	174	res = Root_RAM0;
	175	if (strcmp(name, "ram") == 0)
	176	goto done;
	177
	178	if (strlen(name) > 31)
	179	goto fail;
	180	strcpy(s, name);
	181	for (p = s; *p; p++)
	182	if (*p == '/')
	183	*p = '!';
30f2f0eb KS	184	res = blk_lookup_devt(s, 0);
	185	if (res)
	186	goto done;
	187
	188	/*
	189	* try non-existant, but valid partition, which may only exist
	190	* after revalidating the disk, like partitioned md devices
	191	*/
	192	while (p > s && isdigit(p[-1]))
	193	p--;
	194	if (p == s \|\| !p \|\| p == '0')
	195	goto fail;
	196
	197	/* try disk name without <part number> */
	198	part = simple_strtoul(p, NULL, 10);
	199	*p = '\0';
	200	res = blk_lookup_devt(s, part);
	201	if (res)
	202	goto done;
	203
	204	/* try disk name without p<part number> */
	205	if (p < s + 2 \|\| !isdigit(p[-2]) \|\| p[-1] != 'p')
	206	goto fail;
	207	p[-1] = '\0';
	208	res = blk_lookup_devt(s, part);
1da177e4 LT	209	if (res)
	210	goto done;
	211
edfaa7c3 KS	212	fail:
edfaa7c3 KS	213	return 0;
1da177e4	214	done:
1da177e4	215	return res;
1da177e4 LT	216	}
	217
	218	static int __init root_dev_setup(char *line)
	219	{
	220	strlcpy(saved_root_name, line, sizeof(saved_root_name));
	221	return 1;
	222	}
	223
	224	__setup("root=", root_dev_setup);
	225
cc1ed754 PO	226	static int __init rootwait_setup(char *str)
	227	{
	228	if (*str)
	229	return 0;
	230	root_wait = 1;
	231	return 1;
	232	}
	233
	234	__setup("rootwait", rootwait_setup);
	235
1da177e4 LT	236	static char * __initdata root_mount_data;
	237	static int __init root_data_setup(char *str)
	238	{
	239	root_mount_data = str;
	240	return 1;
	241	}
	242
	243	static char * __initdata root_fs_names;
	244	static int __init fs_names_setup(char *str)
	245	{
	246	root_fs_names = str;
	247	return 1;
	248	}
	249
	250	static unsigned int __initdata root_delay;
	251	static int __init root_delay_setup(char *str)
	252	{
	253	root_delay = simple_strtoul(str, NULL, 0);
	254	return 1;
	255	}
	256
	257	__setup("rootflags=", root_data_setup);
	258	__setup("rootfstype=", fs_names_setup);
	259	__setup("rootdelay=", root_delay_setup);
	260
	261	static void __init get_fs_names(char *page)
	262	{
	263	char *s = page;
	264
	265	if (root_fs_names) {
	266	strcpy(page, root_fs_names);
	267	while (*s++) {
	268	if (s[-1] == ',')
	269	s[-1] = '\0';
	270	}
	271	} else {
	272	int len = get_filesystem_list(page);
	273	char p, next;
	274
	275	page[len] = '\0';
	276	for (p = page-1; p; p = next) {
	277	next = strchr(++p, '\n');
	278	if (*p++ != '\t')
	279	continue;
	280	while ((s++ = p++) != '\n')
	281	;
	282	s[-1] = '\0';
	283	}
	284	}
	285	*s = '\0';
	286	}
	287
	288	static int __init do_mount_root(char name, char fs, int flags, void *data)
	289	{
	290	int err = sys_mount(name, "/root", fs, flags, data);
	291	if (err)
	292	return err;
	293
562f5e63	294	sys_chdir((const char __user __force *)"/root");
6ac08c39	295	ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
bca1033b	296	printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
6ac08c39 JB	297	current->fs->pwd.mnt->mnt_sb->s_type->name,
6ac08c39 JB	298	current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
bca1033b	299	" readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
1da177e4 LT	300	return 0;
	301	}
	302
	303	void __init mount_block_root(char *name, int flags)
	304	{
3b5c760e VN	305	char *fs_names = __getname_gfp(GFP_KERNEL
3b5c760e VN	306	\| __GFP_NOTRACK_FALSE_POSITIVE);
1da177e4	307	char *p;
9361401e	308	#ifdef CONFIG_BLOCK
1da177e4	309	char b[BDEVNAME_SIZE];
9361401e DH	310	#else
	311	const char *b = name;
	312	#endif
1da177e4 LT	313
	314	get_fs_names(fs_names);
	315	retry:
	316	for (p = fs_names; *p; p += strlen(p)+1) {
	317	int err = do_mount_root(name, p, flags, root_mount_data);
	318	switch (err) {
	319	case 0:
	320	goto out;
	321	case -EACCES:
	322	flags \|= MS_RDONLY;
	323	goto retry;
	324	case -EINVAL:
	325	continue;
	326	}
	327	/*
	328	* Allow the user to distinguish between failed sys_open
	329	* and bad superblock on root device.
dd2a345f	330	* and give them a list of the available devices
1da177e4	331	*/
9361401e	332	#ifdef CONFIG_BLOCK
1da177e4	333	__bdevname(ROOT_DEV, b);
9361401e	334	#endif
1da177e4 LT	335	printk("VFS: Cannot open root device \"%s\" or %s\n",
1da177e4 LT	336	root_device_name, b);
dd2a345f	337	printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
1da177e4	338
dd2a345f	339	printk_all_partitions();
55dc7db7 TH	340	#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
	341	printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
	342	"explicit textual name for \"root=\" boot option.\n");
	343	#endif
1da177e4 LT	344	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	345	}
be6e028b	346
dd2a345f DG	347	printk("List of all partitions:\n");
dd2a345f DG	348	printk_all_partitions();
be6e028b AW	349	printk("No filesystem could mount root, tried: ");
	350	for (p = fs_names; *p; p += strlen(p)+1)
	351	printk(" %s", p);
	352	printk("\n");
9361401e DH	353	#ifdef CONFIG_BLOCK
	354	__bdevname(ROOT_DEV, b);
	355	#endif
	356	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	357	out:
	358	putname(fs_names);
	359	}
	360
	361	#ifdef CONFIG_ROOT_NFS
	362	static int __init mount_nfs_root(void)
	363	{
56463e50	364	char root_dev, root_data;
1da177e4	365
56463e50 CL	366	if (nfs_root_data(&root_dev, &root_data) != 0)
	367	return 0;
	368	if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
	369	return 0;
	370	return 1;
1da177e4 LT	371	}
	372	#endif
	373
	374	#if defined(CONFIG_BLK_DEV_RAM) \|\| defined(CONFIG_BLK_DEV_FD)
	375	void __init change_floppy(char *fmt, ...)
	376	{
	377	struct termios termios;
	378	char buf[80];
	379	char c;
	380	int fd;
	381	va_list args;
	382	va_start(args, fmt);
	383	vsprintf(buf, fmt, args);
	384	va_end(args);
	385	fd = sys_open("/dev/root", O_RDWR \| O_NDELAY, 0);
	386	if (fd >= 0) {
	387	sys_ioctl(fd, FDEJECT, 0);
	388	sys_close(fd);
	389	}
	390	printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
	391	fd = sys_open("/dev/console", O_RDWR, 0);
	392	if (fd >= 0) {
	393	sys_ioctl(fd, TCGETS, (long)&termios);
	394	termios.c_lflag &= ~ICANON;
	395	sys_ioctl(fd, TCSETSF, (long)&termios);
	396	sys_read(fd, &c, 1);
	397	termios.c_lflag \|= ICANON;
	398	sys_ioctl(fd, TCSETSF, (long)&termios);
	399	sys_close(fd);
	400	}
	401	}
	402	#endif
	403
	404	void __init mount_root(void)
	405	{
	406	#ifdef CONFIG_ROOT_NFS
	407	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
	408	if (mount_nfs_root())
	409	return;
	410
	411	printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
	412	ROOT_DEV = Root_FD0;
	413	}
	414	#endif
	415	#ifdef CONFIG_BLK_DEV_FD
	416	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
	417	/* rd_doload is 2 for a dual initrd/ramload setup */
	418	if (rd_doload==2) {
	419	if (rd_load_disk(1)) {
	420	ROOT_DEV = Root_RAM1;
	421	root_device_name = NULL;
	422	}
	423	} else
	424	change_floppy("root floppy");
	425	}
	426	#endif
9361401e	427	#ifdef CONFIG_BLOCK
bdaf8529	428	create_dev("/dev/root", ROOT_DEV);
1da177e4	429	mount_block_root("/dev/root", root_mountflags);
9361401e	430	#endif
1da177e4 LT	431	}
	432
	433	/*
	434	* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
	435	*/
	436	void __init prepare_namespace(void)
	437	{
	438	int is_floppy;
	439
1da177e4 LT	440	if (root_delay) {
	441	printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
	442	root_delay);
	443	ssleep(root_delay);
	444	}
	445
216773a7 AV	446	/*
	447	* wait for the known devices to complete their probing
	448	*
	449	* Note: this is a potential source of long boot delays.
	450	* For example, it is not atypical to wait 5 seconds here
	451	* for the touchpad of a laptop to initialize.
	452	*/
	453	wait_for_device_probe();
d779249e	454
1da177e4 LT	455	md_run_setup();
	456
	457	if (saved_root_name[0]) {
	458	root_device_name = saved_root_name;
2d62f488 AH	459	if (!strncmp(root_device_name, "mtd", 3) \|\|
2d62f488 AH	460	!strncmp(root_device_name, "ubi", 3)) {
e9482b43 JE	461	mount_block_root(root_device_name, root_mountflags);
	462	goto out;
	463	}
1da177e4 LT	464	ROOT_DEV = name_to_dev_t(root_device_name);
	465	if (strncmp(root_device_name, "/dev/", 5) == 0)
	466	root_device_name += 5;
	467	}
	468
1da177e4 LT	469	if (initrd_load())
	470	goto out;
	471
cc1ed754 PO	472	/* wait for any asynchronous scanning to complete */
	473	if ((ROOT_DEV == 0) && root_wait) {
	474	printk(KERN_INFO "Waiting for root device %s...\n",
	475	saved_root_name);
	476	while (driver_probe_done() != 0 \|\|
	477	(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
	478	msleep(100);
216773a7	479	async_synchronize_full();
cc1ed754 PO	480	}
	481
	482	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
	483
1da177e4 LT	484	if (is_floppy && rd_doload && rd_load_disk(0))
	485	ROOT_DEV = Root_RAM0;
	486
	487	mount_root();
	488	out:
2b2af54a	489	devtmpfs_mount("dev");
1da177e4	490	sys_mount(".", "/", NULL, MS_MOVE, NULL);
562f5e63	491	sys_chroot((const char __user __force *)".");
1da177e4	492	}