[GitHub/mt8127/android_kernel_alcatel_ttab.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);

/**
 * 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;
}

/*
 *	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;

	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;
	}

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