[thirdparty/linux.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 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:	min 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.
 *
 * If @uuid is followed by a "/PARTNROFF=%d", then the number will be
 * extracted and used as an offset from the partition identified by the UUID.
 *
 * Returns the matching dev_t on success or 0 on failure.
 */
static dev_t devt_from_partuuid(char *uuid_str)
{
	dev_t res = 0;
	struct device *dev = NULL;
	u8 uuid[16];
	struct gendisk *disk;
	struct hd_struct *part;
	int offset = 0;

	if (strlen(uuid_str) < 36)
		goto done;

	/* Check for optional partition number offset attributes. */
	if (uuid_str[36]) {
		char c = 0;
		/* Explicitly fail on poor PARTUUID syntax. */
		if (sscanf(&uuid_str[36],
			   "/PARTNROFF=%d%c", &offset, &c) != 1) {
			printk(KERN_ERR "VFS: PARTUUID= is invalid.\n"
			 "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");
			if (root_wait)
				printk(KERN_ERR
				     "Disabling rootwait; root= is invalid.\n");
			root_wait = 0;
			goto done;
		}
	}

	/* 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;

	/* Attempt to find the partition by offset. */
	if (!offset)
		goto no_offset;

	res = 0;
	disk = part_to_disk(dev_to_part(dev));
	part = disk_get_part(disk, dev_to_part(dev)->partno + offset);
	if (part) {
		res = part_devt(part);
		put_device(part_to_dev(part));
	}

no_offset:
	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.
 *	7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to
 *	   a partition with a known unique id.
 *
 *	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;
		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-existent, 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(KERN_INFO
	       "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];
79975f13	31	static int 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
79975f13	88	* @uuid: min 36 byte char array containing a hex ascii UUID
b5af921e WD	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	*
79975f13 WD	94	* If @uuid is followed by a "/PARTNROFF=%d", then the number will be
	95	* extracted and used as an offset from the partition identified by the UUID.
	96	*
b5af921e WD	97	* Returns the matching dev_t on success or 0 on failure.
b5af921e WD	98	*/
a1cf11d8	99	static dev_t devt_from_partuuid(char *uuid_str)
b5af921e WD	100	{
	101	dev_t res = 0;
	102	struct device *dev = NULL;
	103	u8 uuid[16];
79975f13 WD	104	struct gendisk *disk;
	105	struct hd_struct *part;
	106	int offset = 0;
	107
	108	if (strlen(uuid_str) < 36)
	109	goto done;
	110
	111	/* Check for optional partition number offset attributes. */
	112	if (uuid_str[36]) {
	113	char c = 0;
	114	/* Explicitly fail on poor PARTUUID syntax. */
	115	if (sscanf(&uuid_str[36],
	116	"/PARTNROFF=%d%c", &offset, &c) != 1) {
	117	printk(KERN_ERR "VFS: PARTUUID= is invalid.\n"
	118	"Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");
	119	if (root_wait)
	120	printk(KERN_ERR
	121	"Disabling rootwait; root= is invalid.\n");
	122	root_wait = 0;
	123	goto done;
	124	}
	125	}
b5af921e WD	126
	127	/* Pack the requested UUID in the expected format. */
	128	part_pack_uuid(uuid_str, uuid);
	129
	130	dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid);
	131	if (!dev)
	132	goto done;
	133
	134	res = dev->devt;
b5af921e	135
79975f13 WD	136	/* Attempt to find the partition by offset. */
	137	if (!offset)
	138	goto no_offset;
	139
	140	res = 0;
	141	disk = part_to_disk(dev_to_part(dev));
	142	part = disk_get_part(disk, dev_to_part(dev)->partno + offset);
	143	if (part) {
	144	res = part_devt(part);
	145	put_device(part_to_dev(part));
	146	}
	147
	148	no_offset:
	149	put_device(dev);
b5af921e WD	150	done:
	151	return res;
	152	}
6d0aed7a	153	#endif
b5af921e	154
1da177e4 LT	155	/*
	156	* Convert a name into device number. We accept the following variants:
	157	*
	158	* 1) device number in hexadecimal represents itself
	159	* 2) /dev/nfs represents Root_NFS (0xff)
	160	* 3) /dev/<disk_name> represents the device number of disk
	161	* 4) /dev/<disk_name><decimal> represents the device number
	162	* of partition - device number of disk plus the partition number
	163	* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
	164	* used when disk name of partitioned disk ends on a digit.
b5af921e WD	165	* 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
b5af921e WD	166	* unique id of a partition if the partition table provides it.
79975f13 WD	167	* 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to
79975f13 WD	168	* a partition with a known unique id.
1da177e4	169	*
edfaa7c3 KS	170	* If name doesn't have fall into the categories above, we return (0,0).
	171	* block_class is used to check if something is a disk name. If the disk
	172	* name contains slashes, the device name has them replaced with
	173	* bangs.
1da177e4 LT	174	*/
	175
	176	dev_t name_to_dev_t(char *name)
	177	{
	178	char s[32];
	179	char *p;
	180	dev_t res = 0;
30f2f0eb	181	int part;
1da177e4	182
6d0aed7a	183	#ifdef CONFIG_BLOCK
b5af921e WD	184	if (strncmp(name, "PARTUUID=", 9) == 0) {
b5af921e WD	185	name += 9;
b5af921e WD	186	res = devt_from_partuuid(name);
	187	if (!res)
	188	goto fail;
	189	goto done;
	190	}
6d0aed7a	191	#endif
b5af921e	192
1da177e4 LT	193	if (strncmp(name, "/dev/", 5) != 0) {
	194	unsigned maj, min;
	195
	196	if (sscanf(name, "%u:%u", &maj, &min) == 2) {
	197	res = MKDEV(maj, min);
	198	if (maj != MAJOR(res) \|\| min != MINOR(res))
	199	goto fail;
	200	} else {
	201	res = new_decode_dev(simple_strtoul(name, &p, 16));
	202	if (*p)
	203	goto fail;
	204	}
	205	goto done;
	206	}
edfaa7c3	207
1da177e4 LT	208	name += 5;
	209	res = Root_NFS;
	210	if (strcmp(name, "nfs") == 0)
	211	goto done;
	212	res = Root_RAM0;
	213	if (strcmp(name, "ram") == 0)
	214	goto done;
	215
	216	if (strlen(name) > 31)
	217	goto fail;
	218	strcpy(s, name);
	219	for (p = s; *p; p++)
	220	if (*p == '/')
	221	*p = '!';
30f2f0eb KS	222	res = blk_lookup_devt(s, 0);
	223	if (res)
	224	goto done;
	225
	226	/*
25985edc	227	* try non-existent, but valid partition, which may only exist
30f2f0eb KS	228	* after revalidating the disk, like partitioned md devices
	229	*/
	230	while (p > s && isdigit(p[-1]))
	231	p--;
	232	if (p == s \|\| !p \|\| p == '0')
	233	goto fail;
	234
	235	/* try disk name without <part number> */
	236	part = simple_strtoul(p, NULL, 10);
	237	*p = '\0';
	238	res = blk_lookup_devt(s, part);
	239	if (res)
	240	goto done;
	241
	242	/* try disk name without p<part number> */
	243	if (p < s + 2 \|\| !isdigit(p[-2]) \|\| p[-1] != 'p')
	244	goto fail;
	245	p[-1] = '\0';
	246	res = blk_lookup_devt(s, part);
1da177e4 LT	247	if (res)
	248	goto done;
	249
edfaa7c3 KS	250	fail:
edfaa7c3 KS	251	return 0;
1da177e4	252	done:
1da177e4	253	return res;
1da177e4 LT	254	}
	255
	256	static int __init root_dev_setup(char *line)
	257	{
	258	strlcpy(saved_root_name, line, sizeof(saved_root_name));
	259	return 1;
	260	}
	261
	262	__setup("root=", root_dev_setup);
	263
cc1ed754 PO	264	static int __init rootwait_setup(char *str)
	265	{
	266	if (*str)
	267	return 0;
	268	root_wait = 1;
	269	return 1;
	270	}
	271
	272	__setup("rootwait", rootwait_setup);
	273
1da177e4 LT	274	static char * __initdata root_mount_data;
	275	static int __init root_data_setup(char *str)
	276	{
	277	root_mount_data = str;
	278	return 1;
	279	}
	280
	281	static char * __initdata root_fs_names;
	282	static int __init fs_names_setup(char *str)
	283	{
	284	root_fs_names = str;
	285	return 1;
	286	}
	287
	288	static unsigned int __initdata root_delay;
	289	static int __init root_delay_setup(char *str)
	290	{
	291	root_delay = simple_strtoul(str, NULL, 0);
	292	return 1;
	293	}
	294
	295	__setup("rootflags=", root_data_setup);
	296	__setup("rootfstype=", fs_names_setup);
	297	__setup("rootdelay=", root_delay_setup);
	298
	299	static void __init get_fs_names(char *page)
	300	{
	301	char *s = page;
	302
	303	if (root_fs_names) {
	304	strcpy(page, root_fs_names);
	305	while (*s++) {
	306	if (s[-1] == ',')
	307	s[-1] = '\0';
	308	}
	309	} else {
	310	int len = get_filesystem_list(page);
	311	char p, next;
	312
	313	page[len] = '\0';
	314	for (p = page-1; p; p = next) {
	315	next = strchr(++p, '\n');
	316	if (*p++ != '\t')
	317	continue;
	318	while ((s++ = p++) != '\n')
	319	;
	320	s[-1] = '\0';
	321	}
	322	}
	323	*s = '\0';
	324	}
	325
	326	static int __init do_mount_root(char name, char fs, int flags, void *data)
	327	{
	328	int err = sys_mount(name, "/root", fs, flags, data);
	329	if (err)
	330	return err;
	331
562f5e63	332	sys_chdir((const char __user __force *)"/root");
6ac08c39	333	ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
80cdc6da MSB	334	printk(KERN_INFO
80cdc6da MSB	335	"VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
6ac08c39 JB	336	current->fs->pwd.mnt->mnt_sb->s_type->name,
6ac08c39 JB	337	current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
bca1033b	338	" readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
1da177e4 LT	339	return 0;
	340	}
	341
	342	void __init mount_block_root(char *name, int flags)
	343	{
3b5c760e VN	344	char *fs_names = __getname_gfp(GFP_KERNEL
3b5c760e VN	345	\| __GFP_NOTRACK_FALSE_POSITIVE);
1da177e4	346	char *p;
9361401e	347	#ifdef CONFIG_BLOCK
1da177e4	348	char b[BDEVNAME_SIZE];
9361401e DH	349	#else
	350	const char *b = name;
	351	#endif
1da177e4 LT	352
	353	get_fs_names(fs_names);
	354	retry:
	355	for (p = fs_names; *p; p += strlen(p)+1) {
	356	int err = do_mount_root(name, p, flags, root_mount_data);
	357	switch (err) {
	358	case 0:
	359	goto out;
	360	case -EACCES:
	361	flags \|= MS_RDONLY;
	362	goto retry;
	363	case -EINVAL:
	364	continue;
	365	}
	366	/*
	367	* Allow the user to distinguish between failed sys_open
	368	* and bad superblock on root device.
dd2a345f	369	* and give them a list of the available devices
1da177e4	370	*/
9361401e	371	#ifdef CONFIG_BLOCK
1da177e4	372	__bdevname(ROOT_DEV, b);
9361401e	373	#endif
1da177e4 LT	374	printk("VFS: Cannot open root device \"%s\" or %s\n",
1da177e4 LT	375	root_device_name, b);
dd2a345f	376	printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
1da177e4	377
dd2a345f	378	printk_all_partitions();
55dc7db7 TH	379	#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
	380	printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
	381	"explicit textual name for \"root=\" boot option.\n");
	382	#endif
1da177e4 LT	383	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	384	}
be6e028b	385
dd2a345f DG	386	printk("List of all partitions:\n");
dd2a345f DG	387	printk_all_partitions();
be6e028b AW	388	printk("No filesystem could mount root, tried: ");
	389	for (p = fs_names; *p; p += strlen(p)+1)
	390	printk(" %s", p);
	391	printk("\n");
9361401e DH	392	#ifdef CONFIG_BLOCK
	393	__bdevname(ROOT_DEV, b);
	394	#endif
	395	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	396	out:
	397	putname(fs_names);
	398	}
	399
	400	#ifdef CONFIG_ROOT_NFS
	401	static int __init mount_nfs_root(void)
	402	{
56463e50	403	char root_dev, root_data;
1da177e4	404
56463e50 CL	405	if (nfs_root_data(&root_dev, &root_data) != 0)
	406	return 0;
	407	if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
	408	return 0;
	409	return 1;
1da177e4 LT	410	}
	411	#endif
	412
	413	#if defined(CONFIG_BLK_DEV_RAM) \|\| defined(CONFIG_BLK_DEV_FD)
	414	void __init change_floppy(char *fmt, ...)
	415	{
	416	struct termios termios;
	417	char buf[80];
	418	char c;
	419	int fd;
	420	va_list args;
	421	va_start(args, fmt);
	422	vsprintf(buf, fmt, args);
	423	va_end(args);
	424	fd = sys_open("/dev/root", O_RDWR \| O_NDELAY, 0);
	425	if (fd >= 0) {
	426	sys_ioctl(fd, FDEJECT, 0);
	427	sys_close(fd);
	428	}
	429	printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
	430	fd = sys_open("/dev/console", O_RDWR, 0);
	431	if (fd >= 0) {
	432	sys_ioctl(fd, TCGETS, (long)&termios);
	433	termios.c_lflag &= ~ICANON;
	434	sys_ioctl(fd, TCSETSF, (long)&termios);
	435	sys_read(fd, &c, 1);
	436	termios.c_lflag \|= ICANON;
	437	sys_ioctl(fd, TCSETSF, (long)&termios);
	438	sys_close(fd);
	439	}
	440	}
	441	#endif
	442
	443	void __init mount_root(void)
	444	{
	445	#ifdef CONFIG_ROOT_NFS
	446	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
	447	if (mount_nfs_root())
	448	return;
	449
	450	printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
	451	ROOT_DEV = Root_FD0;
	452	}
	453	#endif
	454	#ifdef CONFIG_BLK_DEV_FD
	455	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
	456	/* rd_doload is 2 for a dual initrd/ramload setup */
	457	if (rd_doload==2) {
	458	if (rd_load_disk(1)) {
	459	ROOT_DEV = Root_RAM1;
	460	root_device_name = NULL;
	461	}
	462	} else
	463	change_floppy("root floppy");
	464	}
	465	#endif
9361401e	466	#ifdef CONFIG_BLOCK
bdaf8529	467	create_dev("/dev/root", ROOT_DEV);
1da177e4	468	mount_block_root("/dev/root", root_mountflags);
9361401e	469	#endif
1da177e4 LT	470	}
	471
	472	/*
	473	* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
	474	*/
	475	void __init prepare_namespace(void)
	476	{
	477	int is_floppy;
	478
1da177e4 LT	479	if (root_delay) {
	480	printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
	481	root_delay);
	482	ssleep(root_delay);
	483	}
	484
216773a7 AV	485	/*
	486	* wait for the known devices to complete their probing
	487	*
	488	* Note: this is a potential source of long boot delays.
	489	* For example, it is not atypical to wait 5 seconds here
	490	* for the touchpad of a laptop to initialize.
	491	*/
	492	wait_for_device_probe();
d779249e	493
1da177e4 LT	494	md_run_setup();
	495
	496	if (saved_root_name[0]) {
	497	root_device_name = saved_root_name;
2d62f488 AH	498	if (!strncmp(root_device_name, "mtd", 3) \|\|
2d62f488 AH	499	!strncmp(root_device_name, "ubi", 3)) {
e9482b43 JE	500	mount_block_root(root_device_name, root_mountflags);
	501	goto out;
	502	}
1da177e4 LT	503	ROOT_DEV = name_to_dev_t(root_device_name);
	504	if (strncmp(root_device_name, "/dev/", 5) == 0)
	505	root_device_name += 5;
	506	}
	507
1da177e4 LT	508	if (initrd_load())
	509	goto out;
	510
cc1ed754 PO	511	/* wait for any asynchronous scanning to complete */
	512	if ((ROOT_DEV == 0) && root_wait) {
	513	printk(KERN_INFO "Waiting for root device %s...\n",
	514	saved_root_name);
	515	while (driver_probe_done() != 0 \|\|
	516	(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
	517	msleep(100);
216773a7	518	async_synchronize_full();
cc1ed754 PO	519	}
	520
	521	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
	522
1da177e4 LT	523	if (is_floppy && rd_doload && rd_load_disk(0))
	524	ROOT_DEV = Root_RAM0;
	525
	526	mount_root();
	527	out:
2b2af54a	528	devtmpfs_mount("dev");
1da177e4	529	sys_mount(".", "/", NULL, MS_MOVE, NULL);
562f5e63	530	sys_chroot((const char __user __force *)".");
1da177e4	531	}