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

#include "do_mounts.h"

extern int get_filesystem_list(char * buf);

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

int root_mountflags = MS_RDONLY | MS_SILENT;
char * __initdata root_device_name;
static char __initdata saved_root_name[64];
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->pwdmnt->mnt_sb->s_dev;
	printk("VFS: Mounted root (%s filesystem)%s.\n",
	       current->fs->pwdmnt->mnt_sb->s_type->name,
	       current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? 
	       " readonly" : "");
	return 0;
}

void __init mount_block_root(char *name, int flags)
{
	char *fs_names = __getname();
	char *p;
#ifdef CONFIG_BLOCK
	char b[BDEVNAME_SIZE];
#else
	const char *b = name;
#endif

	get_fs_names(fs_names);
retry:
	for (p = fs_names; *p; p += strlen(p)+1) {
		int err = do_mount_root(name, p, flags, root_mount_data);
		switch (err) {
			case 0:
				goto out;
			case -EACCES:
				flags |= MS_RDONLY;
				goto retry;
			case -EINVAL:
				continue;
		}
	        /*
		 * Allow the user to distinguish between failed sys_open
		 * and bad superblock on root device.
		 * 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>
1da177e4 LT	14
	15	#include <linux/nfs_fs.h>
	16	#include <linux/nfs_fs_sb.h>
	17	#include <linux/nfs_mount.h>
	18
	19	#include "do_mounts.h"
	20
	21	extern int get_filesystem_list(char * buf);
	22
	23	int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
	24
9b04c997	25	int root_mountflags = MS_RDONLY \| MS_SILENT;
1da177e4 LT	26	char * __initdata root_device_name;
1da177e4 LT	27	static char __initdata saved_root_name[64];
cc1ed754	28	static int __initdata root_wait;
1da177e4	29
1da177e4 LT	30	dev_t ROOT_DEV;
1da177e4 LT	31
1da177e4 LT	32	static int __init load_ramdisk(char *str)
	33	{
	34	rd_doload = simple_strtol(str,NULL,0) & 3;
	35	return 1;
	36	}
	37	__setup("load_ramdisk=", load_ramdisk);
	38
	39	static int __init readonly(char *str)
	40	{
	41	if (*str)
	42	return 0;
	43	root_mountflags \|= MS_RDONLY;
	44	return 1;
	45	}
	46
	47	static int __init readwrite(char *str)
	48	{
	49	if (*str)
	50	return 0;
	51	root_mountflags &= ~MS_RDONLY;
	52	return 1;
	53	}
	54
	55	__setup("ro", readonly);
	56	__setup("rw", readwrite);
	57
1da177e4 LT	58	/*
	59	* Convert a name into device number. We accept the following variants:
	60	*
	61	* 1) device number in hexadecimal represents itself
	62	* 2) /dev/nfs represents Root_NFS (0xff)
	63	* 3) /dev/<disk_name> represents the device number of disk
	64	* 4) /dev/<disk_name><decimal> represents the device number
	65	* of partition - device number of disk plus the partition number
	66	* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
	67	* used when disk name of partitioned disk ends on a digit.
	68	*
edfaa7c3 KS	69	* If name doesn't have fall into the categories above, we return (0,0).
	70	* block_class is used to check if something is a disk name. If the disk
	71	* name contains slashes, the device name has them replaced with
	72	* bangs.
1da177e4 LT	73	*/
	74
	75	dev_t name_to_dev_t(char *name)
	76	{
	77	char s[32];
	78	char *p;
	79	dev_t res = 0;
1da177e4 LT	80
	81	if (strncmp(name, "/dev/", 5) != 0) {
	82	unsigned maj, min;
	83
	84	if (sscanf(name, "%u:%u", &maj, &min) == 2) {
	85	res = MKDEV(maj, min);
	86	if (maj != MAJOR(res) \|\| min != MINOR(res))
	87	goto fail;
	88	} else {
	89	res = new_decode_dev(simple_strtoul(name, &p, 16));
	90	if (*p)
	91	goto fail;
	92	}
	93	goto done;
	94	}
edfaa7c3	95
1da177e4 LT	96	name += 5;
	97	res = Root_NFS;
	98	if (strcmp(name, "nfs") == 0)
	99	goto done;
	100	res = Root_RAM0;
	101	if (strcmp(name, "ram") == 0)
	102	goto done;
	103
	104	if (strlen(name) > 31)
	105	goto fail;
	106	strcpy(s, name);
	107	for (p = s; *p; p++)
	108	if (*p == '/')
	109	*p = '!';
edfaa7c3	110	res = blk_lookup_devt(s);
1da177e4 LT	111	if (res)
	112	goto done;
	113
edfaa7c3 KS	114	fail:
edfaa7c3 KS	115	return 0;
1da177e4	116	done:
1da177e4	117	return res;
1da177e4 LT	118	}
	119
	120	static int __init root_dev_setup(char *line)
	121	{
	122	strlcpy(saved_root_name, line, sizeof(saved_root_name));
	123	return 1;
	124	}
	125
	126	__setup("root=", root_dev_setup);
	127
cc1ed754 PO	128	static int __init rootwait_setup(char *str)
	129	{
	130	if (*str)
	131	return 0;
	132	root_wait = 1;
	133	return 1;
	134	}
	135
	136	__setup("rootwait", rootwait_setup);
	137
1da177e4 LT	138	static char * __initdata root_mount_data;
	139	static int __init root_data_setup(char *str)
	140	{
	141	root_mount_data = str;
	142	return 1;
	143	}
	144
	145	static char * __initdata root_fs_names;
	146	static int __init fs_names_setup(char *str)
	147	{
	148	root_fs_names = str;
	149	return 1;
	150	}
	151
	152	static unsigned int __initdata root_delay;
	153	static int __init root_delay_setup(char *str)
	154	{
	155	root_delay = simple_strtoul(str, NULL, 0);
	156	return 1;
	157	}
	158
	159	__setup("rootflags=", root_data_setup);
	160	__setup("rootfstype=", fs_names_setup);
	161	__setup("rootdelay=", root_delay_setup);
	162
	163	static void __init get_fs_names(char *page)
	164	{
	165	char *s = page;
	166
	167	if (root_fs_names) {
	168	strcpy(page, root_fs_names);
	169	while (*s++) {
	170	if (s[-1] == ',')
	171	s[-1] = '\0';
	172	}
	173	} else {
	174	int len = get_filesystem_list(page);
	175	char p, next;
	176
	177	page[len] = '\0';
	178	for (p = page-1; p; p = next) {
	179	next = strchr(++p, '\n');
	180	if (*p++ != '\t')
	181	continue;
	182	while ((s++ = p++) != '\n')
	183	;
	184	s[-1] = '\0';
	185	}
	186	}
	187	*s = '\0';
	188	}
	189
	190	static int __init do_mount_root(char name, char fs, int flags, void *data)
	191	{
	192	int err = sys_mount(name, "/root", fs, flags, data);
	193	if (err)
	194	return err;
	195
	196	sys_chdir("/root");
	197	ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
	198	printk("VFS: Mounted root (%s filesystem)%s.\n",
	199	current->fs->pwdmnt->mnt_sb->s_type->name,
	200	current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
	201	" readonly" : "");
202	return 0;
203	}
204
205	void __init mount_block_root(char *name, int flags)
206	{
207	char *fs_names = __getname();
208	char *p;
9361401e	209	#ifdef CONFIG_BLOCK
1da177e4	210	char b[BDEVNAME_SIZE];
9361401e DH	211	#else
	212	const char *b = name;
	213	#endif
1da177e4 LT	214
	215	get_fs_names(fs_names);
	216	retry:
	217	for (p = fs_names; *p; p += strlen(p)+1) {
	218	int err = do_mount_root(name, p, flags, root_mount_data);
	219	switch (err) {
	220	case 0:
	221	goto out;
	222	case -EACCES:
	223	flags \|= MS_RDONLY;
	224	goto retry;
	225	case -EINVAL:
	226	continue;
	227	}
	228	/*
	229	* Allow the user to distinguish between failed sys_open
	230	* and bad superblock on root device.
dd2a345f	231	* and give them a list of the available devices
1da177e4	232	*/
9361401e	233	#ifdef CONFIG_BLOCK
1da177e4	234	__bdevname(ROOT_DEV, b);
9361401e	235	#endif
1da177e4 LT	236	printk("VFS: Cannot open root device \"%s\" or %s\n",
1da177e4 LT	237	root_device_name, b);
dd2a345f	238	printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
1da177e4	239
dd2a345f	240	printk_all_partitions();
1da177e4 LT	241	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	242	}
be6e028b	243
dd2a345f DG	244	printk("List of all partitions:\n");
dd2a345f DG	245	printk_all_partitions();
be6e028b AW	246	printk("No filesystem could mount root, tried: ");
	247	for (p = fs_names; *p; p += strlen(p)+1)
	248	printk(" %s", p);
	249	printk("\n");
9361401e DH	250	#ifdef CONFIG_BLOCK
	251	__bdevname(ROOT_DEV, b);
	252	#endif
	253	panic("VFS: Unable to mount root fs on %s", b);
1da177e4 LT	254	out:
	255	putname(fs_names);
	256	}
	257
	258	#ifdef CONFIG_ROOT_NFS
	259	static int __init mount_nfs_root(void)
	260	{
	261	void *data = nfs_root_data();
	262
bdaf8529	263	create_dev("/dev/root", ROOT_DEV);
1da177e4 LT	264	if (data &&
	265	do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
	266	return 1;
	267	return 0;
	268	}
	269	#endif
	270
	271	#if defined(CONFIG_BLK_DEV_RAM) \|\| defined(CONFIG_BLK_DEV_FD)
	272	void __init change_floppy(char *fmt, ...)
	273	{
	274	struct termios termios;
	275	char buf[80];
	276	char c;
	277	int fd;
	278	va_list args;
	279	va_start(args, fmt);
	280	vsprintf(buf, fmt, args);
	281	va_end(args);
	282	fd = sys_open("/dev/root", O_RDWR \| O_NDELAY, 0);
	283	if (fd >= 0) {
	284	sys_ioctl(fd, FDEJECT, 0);
	285	sys_close(fd);
	286	}
	287	printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
	288	fd = sys_open("/dev/console", O_RDWR, 0);
	289	if (fd >= 0) {
	290	sys_ioctl(fd, TCGETS, (long)&termios);
	291	termios.c_lflag &= ~ICANON;
	292	sys_ioctl(fd, TCSETSF, (long)&termios);
	293	sys_read(fd, &c, 1);
	294	termios.c_lflag \|= ICANON;
	295	sys_ioctl(fd, TCSETSF, (long)&termios);
	296	sys_close(fd);
	297	}
	298	}
	299	#endif
	300
	301	void __init mount_root(void)
	302	{
	303	#ifdef CONFIG_ROOT_NFS
	304	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
	305	if (mount_nfs_root())
	306	return;
	307
	308	printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
	309	ROOT_DEV = Root_FD0;
	310	}
	311	#endif
	312	#ifdef CONFIG_BLK_DEV_FD
	313	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
	314	/* rd_doload is 2 for a dual initrd/ramload setup */
	315	if (rd_doload==2) {
	316	if (rd_load_disk(1)) {
	317	ROOT_DEV = Root_RAM1;
	318	root_device_name = NULL;
	319	}
	320	} else
	321	change_floppy("root floppy");
	322	}
	323	#endif
9361401e	324	#ifdef CONFIG_BLOCK
bdaf8529	325	create_dev("/dev/root", ROOT_DEV);
1da177e4	326	mount_block_root("/dev/root", root_mountflags);
9361401e	327	#endif
1da177e4 LT	328	}
	329
	330	/*
	331	* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
	332	*/
	333	void __init prepare_namespace(void)
	334	{
	335	int is_floppy;
	336
1da177e4 LT	337	if (root_delay) {
	338	printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
	339	root_delay);
	340	ssleep(root_delay);
	341	}
	342
d779249e GKH	343	/* wait for the known devices to complete their probing */
	344	while (driver_probe_done() != 0)
	345	msleep(100);
	346
1da177e4 LT	347	md_run_setup();
	348
	349	if (saved_root_name[0]) {
	350	root_device_name = saved_root_name;
e9482b43 JE	351	if (!strncmp(root_device_name, "mtd", 3)) {
	352	mount_block_root(root_device_name, root_mountflags);
	353	goto out;
	354	}
1da177e4 LT	355	ROOT_DEV = name_to_dev_t(root_device_name);
	356	if (strncmp(root_device_name, "/dev/", 5) == 0)
	357	root_device_name += 5;
	358	}
	359
1da177e4 LT	360	if (initrd_load())
	361	goto out;
	362
cc1ed754 PO	363	/* wait for any asynchronous scanning to complete */
	364	if ((ROOT_DEV == 0) && root_wait) {
	365	printk(KERN_INFO "Waiting for root device %s...\n",
	366	saved_root_name);
	367	while (driver_probe_done() != 0 \|\|
	368	(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
	369	msleep(100);
	370	}
	371
	372	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
	373
1da177e4 LT	374	if (is_floppy && rd_doload && rd_load_disk(0))
	375	ROOT_DEV = Root_RAM0;
	376
	377	mount_root();
	378	out:
1da177e4 LT	379	sys_mount(".", "/", NULL, MS_MOVE, NULL);
1da177e4 LT	380	sys_chroot(".");
1da177e4 LT	381	}
1da177e4 LT	382