#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/mount.h> #include <linux/device.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]; 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 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; char b[BDEVNAME_SIZE]; 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. */ __bdevname(ROOT_DEV, b); printk("VFS: Cannot open root device \"%s\" or %s\n", root_device_name, b); printk("Please append a correct \"root=\" boot option\n"); panic("VFS: Unable to mount root fs on %s", b); } printk("No filesystem could mount root, tried: "); for (p = fs_names; *p; p += strlen(p)+1) printk(" %s", p); printk("\n"); panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, 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 create_dev("/dev/root", ROOT_DEV); mount_block_root("/dev/root", root_mountflags); } /* * 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; } is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; if (initrd_load()) goto out; 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(); }