init/do_mounts.c - kernel/msm-4.19 - Gitiles

 #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(".");
 	security_sb_post_mountroot();
 }
	#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(".");
	security_sb_post_mountroot();
	}