[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/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;
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);

/*
 *	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 (0,0).
 *	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;

	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);
	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.\n",
	       current->fs->pwd.mnt->mnt_sb->s_type->name,
	       current->fs->pwd.mnt->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.
		 * and give them a list of the available devices
		 */
#ifdef CONFIG_BLOCK
		__bdevname(ROOT_DEV, b);
#endif
		printk("VFS: Cannot open root device \"%s\" or %s\n",
				root_device_name, b);
		printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");

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

	printk("List of all partitions:\n");
	printk_all_partitions();
	printk("No filesystem could mount root, tried: ");
	for (p = fs_names; *p; p += strlen(p)+1)
		printk(" %s", p);
	printk("\n");
#ifdef CONFIG_BLOCK
	__bdevname(ROOT_DEV, b);
#endif
	panic("VFS: Unable to mount root fs on %s", b);
out:
	putname(fs_names);
}
 
#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;
	}

	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);
	}

	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;

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

	mount_root();
out:
	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>
1da177e4 LT	15
	16	#include <linux/nfs_fs.h>
	17	#include <linux/nfs_fs_sb.h>
	18	#include <linux/nfs_mount.h>
	19
	20	#include "do_mounts.h"
	21
1da177e4 LT	22	int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
1da177e4 LT	23
9b04c997	24	int root_mountflags = MS_RDONLY \| MS_SILENT;
1da177e4 LT	25	char * __initdata root_device_name;
1da177e4 LT	26	static char __initdata saved_root_name[64];
cc1ed754	27	static int __initdata root_wait;
1da177e4	28
1da177e4 LT	29	dev_t ROOT_DEV;
1da177e4 LT	30
1da177e4 LT	31	static int __init load_ramdisk(char *str)
	32	{
	33	rd_doload = simple_strtol(str,NULL,0) & 3;
	34	return 1;
	35	}
	36	__setup("load_ramdisk=", load_ramdisk);
	37
	38	static int __init readonly(char *str)
	39	{
	40	if (*str)
	41	return 0;
	42	root_mountflags \|= MS_RDONLY;
	43	return 1;
	44	}
	45
	46	static int __init readwrite(char *str)
	47	{
	48	if (*str)
	49	return 0;
	50	root_mountflags &= ~MS_RDONLY;
	51	return 1;
	52	}
	53
	54	__setup("ro", readonly);
	55	__setup("rw", readwrite);
	56
1da177e4 LT	57	/*
	58	* Convert a name into device number. We accept the following variants:
	59	*
	60	* 1) device number in hexadecimal represents itself
	61	* 2) /dev/nfs represents Root_NFS (0xff)
	62	* 3) /dev/<disk_name> represents the device number of disk
	63	* 4) /dev/<disk_name><decimal> represents the device number
	64	* of partition - device number of disk plus the partition number
	65	* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
	66	* used when disk name of partitioned disk ends on a digit.
	67	*
edfaa7c3 KS	68	* If name doesn't have fall into the categories above, we return (0,0).
	69	* block_class is used to check if something is a disk name. If the disk
	70	* name contains slashes, the device name has them replaced with
	71	* bangs.
1da177e4 LT	72	*/
	73
	74	dev_t name_to_dev_t(char *name)
	75	{
	76	char s[32];
	77	char *p;
	78	dev_t res = 0;
1da177e4 LT	79
	80	if (strncmp(name, "/dev/", 5) != 0) {
	81	unsigned maj, min;
	82
	83	if (sscanf(name, "%u:%u", &maj, &min) == 2) {
	84	res = MKDEV(maj, min);
	85	if (maj != MAJOR(res) \|\| min != MINOR(res))
	86	goto fail;
	87	} else {
	88	res = new_decode_dev(simple_strtoul(name, &p, 16));
	89	if (*p)
	90	goto fail;
	91	}
	92	goto done;
	93	}
edfaa7c3	94
1da177e4 LT	95	name += 5;
	96	res = Root_NFS;
	97	if (strcmp(name, "nfs") == 0)
	98	goto done;
	99	res = Root_RAM0;
	100	if (strcmp(name, "ram") == 0)
	101	goto done;
	102
	103	if (strlen(name) > 31)
	104	goto fail;
	105	strcpy(s, name);
	106	for (p = s; *p; p++)
	107	if (*p == '/')
	108	*p = '!';
edfaa7c3	109	res = blk_lookup_devt(s);
1da177e4 LT	110	if (res)
	111	goto done;
	112
edfaa7c3 KS	113	fail:
edfaa7c3 KS	114	return 0;
1da177e4	115	done:
1da177e4	116	return res;
1da177e4 LT	117	}
	118
	119	static int __init root_dev_setup(char *line)
	120	{
	121	strlcpy(saved_root_name, line, sizeof(saved_root_name));
	122	return 1;
	123	}
	124
	125	__setup("root=", root_dev_setup);
	126
cc1ed754 PO	127	static int __init rootwait_setup(char *str)
	128	{
	129	if (*str)
	130	return 0;
	131	root_wait = 1;
	132	return 1;
	133	}
	134
	135	__setup("rootwait", rootwait_setup);
	136
1da177e4 LT	137	static char * __initdata root_mount_data;
	138	static int __init root_data_setup(char *str)
	139	{
	140	root_mount_data = str;
	141	return 1;
	142	}
	143
	144	static char * __initdata root_fs_names;
	145	static int __init fs_names_setup(char *str)
	146	{
	147	root_fs_names = str;
	148	return 1;
	149	}
	150
	151	static unsigned int __initdata root_delay;
	152	static int __init root_delay_setup(char *str)
	153	{
	154	root_delay = simple_strtoul(str, NULL, 0);
	155	return 1;
	156	}
	157
	158	__setup("rootflags=", root_data_setup);
	159	__setup("rootfstype=", fs_names_setup);
	160	__setup("rootdelay=", root_delay_setup);
	161
	162	static void __init get_fs_names(char *page)
	163	{
	164	char *s = page;
	165
	166	if (root_fs_names) {
	167	strcpy(page, root_fs_names);
	168	while (*s++) {
	169	if (s[-1] == ',')
	170	s[-1] = '\0';
	171	}
	172	} else {
	173	int len = get_filesystem_list(page);
	174	char p, next;
	175
	176	page[len] = '\0';
	177	for (p = page-1; p; p = next) {
	178	next = strchr(++p, '\n');
	179	if (*p++ != '\t')
	180	continue;
	181	while ((s++ = p++) != '\n')
	182	;
	183	s[-1] = '\0';
	184	}
	185	}
	186	*s = '\0';
	187	}
	188
	189	static int __init do_mount_root(char name, char fs, int flags, void *data)
	190	{
	191	int err = sys_mount(name, "/root", fs, flags, data);
	192	if (err)
	193	return err;
	194
	195	sys_chdir("/root");
6ac08c39	196	ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
1da177e4	197	printk("VFS: Mounted root (%s filesystem)%s.\n",
6ac08c39 JB	198	current->fs->pwd.mnt->mnt_sb->s_type->name,
6ac08c39 JB	199	current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
1da177e4 LT	200	" readonly" : "");
	201	return 0;
	202	}
	203
	204	void __init mount_block_root(char *name, int flags)
	205	{
	206	char *fs_names = __getname();
	207	char *p;
9361401e	208	#ifdef CONFIG_BLOCK
1da177e4	209	char b[BDEVNAME_SIZE];
9361401e DH	210	#else
	211	const char *b = name;
	212	#endif
1da177e4 LT	213
	214	get_fs_names(fs_names);
	215	retry:
	216	for (p = fs_names; *p; p += strlen(p)+1) {
	217	int err = do_mount_root(name, p, flags, root_mount_data);
	218	switch (err) {
	219	case 0:
	220	goto out;
	221	case -EACCES:
	222	flags \|= MS_RDONLY;
	223	goto retry;
	224	case -EINVAL:
	225	continue;
	226	}
	227	/*
	228	* Allow the user to distinguish between failed sys_open
	229	* and bad superblock on root device.
dd2a345f	230	* and give them a list of the available devices
1da177e4	231	*/
9361401e	232	#ifdef CONFIG_BLOCK
1da177e4	233	__bdevname(ROOT_DEV, b);
9361401e	234	#endif
1da177e4 LT	235	printk("VFS: Cannot open root device \"%s\" or %s\n",
1da177e4 LT	236	root_device_name, b);
dd2a345f	237	printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
1da177e4	238
dd2a345f	239	printk_all_partitions();
1da177e4 LT	240	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	241	}
be6e028b	242
dd2a345f DG	243	printk("List of all partitions:\n");
dd2a345f DG	244	printk_all_partitions();
be6e028b AW	245	printk("No filesystem could mount root, tried: ");
	246	for (p = fs_names; *p; p += strlen(p)+1)
	247	printk(" %s", p);
	248	printk("\n");
9361401e DH	249	#ifdef CONFIG_BLOCK
	250	__bdevname(ROOT_DEV, b);
	251	#endif
	252	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	253	out:
	254	putname(fs_names);
	255	}
	256
	257	#ifdef CONFIG_ROOT_NFS
	258	static int __init mount_nfs_root(void)
	259	{
	260	void *data = nfs_root_data();
	261
bdaf8529	262	create_dev("/dev/root", ROOT_DEV);
1da177e4 LT	263	if (data &&
	264	do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
	265	return 1;
	266	return 0;
	267	}
	268	#endif
	269
	270	#if defined(CONFIG_BLK_DEV_RAM) \|\| defined(CONFIG_BLK_DEV_FD)
	271	void __init change_floppy(char *fmt, ...)
	272	{
	273	struct termios termios;
	274	char buf[80];
	275	char c;
	276	int fd;
	277	va_list args;
	278	va_start(args, fmt);
	279	vsprintf(buf, fmt, args);
	280	va_end(args);
	281	fd = sys_open("/dev/root", O_RDWR \| O_NDELAY, 0);
	282	if (fd >= 0) {
	283	sys_ioctl(fd, FDEJECT, 0);
	284	sys_close(fd);
	285	}
	286	printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
	287	fd = sys_open("/dev/console", O_RDWR, 0);
	288	if (fd >= 0) {
	289	sys_ioctl(fd, TCGETS, (long)&termios);
	290	termios.c_lflag &= ~ICANON;
	291	sys_ioctl(fd, TCSETSF, (long)&termios);
	292	sys_read(fd, &c, 1);
	293	termios.c_lflag \|= ICANON;
	294	sys_ioctl(fd, TCSETSF, (long)&termios);
	295	sys_close(fd);
	296	}
	297	}
	298	#endif
	299
	300	void __init mount_root(void)
	301	{
	302	#ifdef CONFIG_ROOT_NFS
	303	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
	304	if (mount_nfs_root())
	305	return;
	306
	307	printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
	308	ROOT_DEV = Root_FD0;
	309	}
	310	#endif
	311	#ifdef CONFIG_BLK_DEV_FD
	312	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
	313	/* rd_doload is 2 for a dual initrd/ramload setup */
	314	if (rd_doload==2) {
	315	if (rd_load_disk(1)) {
	316	ROOT_DEV = Root_RAM1;
	317	root_device_name = NULL;
	318	}
	319	} else
	320	change_floppy("root floppy");
	321	}
	322	#endif
9361401e	323	#ifdef CONFIG_BLOCK
bdaf8529	324	create_dev("/dev/root", ROOT_DEV);
1da177e4	325	mount_block_root("/dev/root", root_mountflags);
9361401e	326	#endif
1da177e4 LT	327	}
	328
	329	/*
	330	* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
	331	*/
	332	void __init prepare_namespace(void)
	333	{
	334	int is_floppy;
	335
1da177e4 LT	336	if (root_delay) {
	337	printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
	338	root_delay);
	339	ssleep(root_delay);
	340	}
	341
d779249e GKH	342	/* wait for the known devices to complete their probing */
	343	while (driver_probe_done() != 0)
	344	msleep(100);
	345
1da177e4 LT	346	md_run_setup();
	347
	348	if (saved_root_name[0]) {
	349	root_device_name = saved_root_name;
e9482b43 JE	350	if (!strncmp(root_device_name, "mtd", 3)) {
	351	mount_block_root(root_device_name, root_mountflags);
	352	goto out;
	353	}
1da177e4 LT	354	ROOT_DEV = name_to_dev_t(root_device_name);
	355	if (strncmp(root_device_name, "/dev/", 5) == 0)
	356	root_device_name += 5;
	357	}
	358
1da177e4 LT	359	if (initrd_load())
	360	goto out;
	361
cc1ed754 PO	362	/* wait for any asynchronous scanning to complete */
	363	if ((ROOT_DEV == 0) && root_wait) {
	364	printk(KERN_INFO "Waiting for root device %s...\n",
	365	saved_root_name);
	366	while (driver_probe_done() != 0 \|\|
	367	(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
	368	msleep(100);
	369	}
	370
	371	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
	372
1da177e4 LT	373	if (is_floppy && rd_doload && rd_load_disk(0))
	374	ROOT_DEV = Root_RAM0;
	375
	376	mount_root();
	377	out:
1da177e4 LT	378	sys_mount(".", "/", NULL, MS_MOVE, NULL);
1da177e4 LT	379	sys_chroot(".");
1da177e4 LT	380	}
1da177e4 LT	381