Subversion Repositories test_project

#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);

static dev_t try_name(char *name, int part)

{

        char path[64];

        char buf[32];

        int range;

        dev_t res;

        char *s;

        int len;

        int fd;

        unsigned int maj, min;

        /* read device number from .../dev */

        sprintf(path, "/sys/block/%s/dev", name);

        fd = sys_open(path, 0, 0);

        if (fd < 0)

                goto fail;

        len = sys_read(fd, buf, 32);

        sys_close(fd);

        if (len <= 0 || len == 32 || buf[len - 1] != '\n')

                goto fail;

        buf[len - 1] = '\0';

        if (sscanf(buf, "%u:%u", &maj, &min) == 2) {

                /*

                 * Try the %u:%u format -- see print_dev_t()

                 */

                res = MKDEV(maj, min);

                if (maj != MAJOR(res) || min != MINOR(res))

                        goto fail;

        } else {

                /*

                 * Nope.  Try old-style "0321"

                 */

                res = new_decode_dev(simple_strtoul(buf, &s, 16));

                if (*s)

                        goto fail;

        }

        /* if it's there and we are not looking for a partition - that's it */

        if (!part)

                return res;

        /* otherwise read range from .../range */

        sprintf(path, "/sys/block/%s/range", name);

        fd = sys_open(path, 0, 0);

        if (fd < 0)

                goto fail;

        len = sys_read(fd, buf, 32);

        sys_close(fd);

        if (len <= 0 || len == 32 || buf[len - 1] != '\n')

                goto fail;

        buf[len - 1] = '\0';

        range = simple_strtoul(buf, &s, 10);

        if (*s)

                goto fail;

        /* if partition is within range - we got it */

        if (part < range)

                return res + part;

fail:

        return 0;

}

/*

 *      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.

 *      Sysfs is used to check if something is a disk name - it has

 *      all known disks under bus/block/devices.  If the disk name

 *      contains slashes, name of sysfs node has them replaced with

 *      bangs.  try_name() does the actual checks, assuming that sysfs

 *      is mounted on rootfs /sys.

 */

dev_t name_to_dev_t(char *name)

{

        char s[32];

        char *p;

        dev_t res = 0;

        int part;

#ifdef CONFIG_SYSFS

        int mkdir_err = sys_mkdir("/sys", 0700);

        if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)

                goto out;

#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 = try_name(s, 0);

        if (res)

                goto done;

        while (p > s && isdigit(p[-1]))

                p--;

        if (p == s || !*p || *p == '0')

                goto fail;

        part = simple_strtoul(p, NULL, 10);

        *p = '\0';

        res = try_name(s, part);

        if (res)

                goto done;

        if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')

                goto fail;

        p[-1] = '\0';

        res = try_name(s, part);

done:

#ifdef CONFIG_SYSFS

        sys_umount("/sys", 0);

out:

        if (!mkdir_err)

                sys_rmdir("/sys");

#endif

        return res;

fail:

        res = 0;

        goto done;

}

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();

}