11da177e4SLinus Torvalds #include <linux/module.h> 21da177e4SLinus Torvalds #include <linux/sched.h> 31da177e4SLinus Torvalds #include <linux/ctype.h> 41da177e4SLinus Torvalds #include <linux/fd.h> 51da177e4SLinus Torvalds #include <linux/tty.h> 61da177e4SLinus Torvalds #include <linux/suspend.h> 71da177e4SLinus Torvalds #include <linux/root_dev.h> 81da177e4SLinus Torvalds #include <linux/security.h> 91da177e4SLinus Torvalds #include <linux/delay.h> 10dd2a345fSDave Gilbert #include <linux/genhd.h> 11d53d9f16SAndrew Morton #include <linux/mount.h> 12d779249eSGreg Kroah-Hartman #include <linux/device.h> 1346595390SAdrian Bunk #include <linux/init.h> 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #include <linux/nfs_fs.h> 161da177e4SLinus Torvalds #include <linux/nfs_fs_sb.h> 171da177e4SLinus Torvalds #include <linux/nfs_mount.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include "do_mounts.h" 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds extern int get_filesystem_list(char * buf); 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 241da177e4SLinus Torvalds 259b04c997STheodore Ts'o int root_mountflags = MS_RDONLY | MS_SILENT; 261da177e4SLinus Torvalds char * __initdata root_device_name; 271da177e4SLinus Torvalds static char __initdata saved_root_name[64]; 28cc1ed754SPierre Ossman static int __initdata root_wait; 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds dev_t ROOT_DEV; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds static int __init load_ramdisk(char *str) 331da177e4SLinus Torvalds { 341da177e4SLinus Torvalds rd_doload = simple_strtol(str,NULL,0) & 3; 351da177e4SLinus Torvalds return 1; 361da177e4SLinus Torvalds } 371da177e4SLinus Torvalds __setup("load_ramdisk=", load_ramdisk); 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds static int __init readonly(char *str) 401da177e4SLinus Torvalds { 411da177e4SLinus Torvalds if (*str) 421da177e4SLinus Torvalds return 0; 431da177e4SLinus Torvalds root_mountflags |= MS_RDONLY; 441da177e4SLinus Torvalds return 1; 451da177e4SLinus Torvalds } 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds static int __init readwrite(char *str) 481da177e4SLinus Torvalds { 491da177e4SLinus Torvalds if (*str) 501da177e4SLinus Torvalds return 0; 511da177e4SLinus Torvalds root_mountflags &= ~MS_RDONLY; 521da177e4SLinus Torvalds return 1; 531da177e4SLinus Torvalds } 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds __setup("ro", readonly); 561da177e4SLinus Torvalds __setup("rw", readwrite); 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* 591da177e4SLinus Torvalds * Convert a name into device number. We accept the following variants: 601da177e4SLinus Torvalds * 611da177e4SLinus Torvalds * 1) device number in hexadecimal represents itself 621da177e4SLinus Torvalds * 2) /dev/nfs represents Root_NFS (0xff) 631da177e4SLinus Torvalds * 3) /dev/<disk_name> represents the device number of disk 641da177e4SLinus Torvalds * 4) /dev/<disk_name><decimal> represents the device number 651da177e4SLinus Torvalds * of partition - device number of disk plus the partition number 661da177e4SLinus Torvalds * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 671da177e4SLinus Torvalds * used when disk name of partitioned disk ends on a digit. 681da177e4SLinus Torvalds * 69edfaa7c3SKay Sievers * If name doesn't have fall into the categories above, we return (0,0). 70edfaa7c3SKay Sievers * block_class is used to check if something is a disk name. If the disk 71edfaa7c3SKay Sievers * name contains slashes, the device name has them replaced with 72edfaa7c3SKay Sievers * bangs. 731da177e4SLinus Torvalds */ 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds dev_t name_to_dev_t(char *name) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds char s[32]; 781da177e4SLinus Torvalds char *p; 791da177e4SLinus Torvalds dev_t res = 0; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds if (strncmp(name, "/dev/", 5) != 0) { 821da177e4SLinus Torvalds unsigned maj, min; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds if (sscanf(name, "%u:%u", &maj, &min) == 2) { 851da177e4SLinus Torvalds res = MKDEV(maj, min); 861da177e4SLinus Torvalds if (maj != MAJOR(res) || min != MINOR(res)) 871da177e4SLinus Torvalds goto fail; 881da177e4SLinus Torvalds } else { 891da177e4SLinus Torvalds res = new_decode_dev(simple_strtoul(name, &p, 16)); 901da177e4SLinus Torvalds if (*p) 911da177e4SLinus Torvalds goto fail; 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds goto done; 941da177e4SLinus Torvalds } 95edfaa7c3SKay Sievers 961da177e4SLinus Torvalds name += 5; 971da177e4SLinus Torvalds res = Root_NFS; 981da177e4SLinus Torvalds if (strcmp(name, "nfs") == 0) 991da177e4SLinus Torvalds goto done; 1001da177e4SLinus Torvalds res = Root_RAM0; 1011da177e4SLinus Torvalds if (strcmp(name, "ram") == 0) 1021da177e4SLinus Torvalds goto done; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds if (strlen(name) > 31) 1051da177e4SLinus Torvalds goto fail; 1061da177e4SLinus Torvalds strcpy(s, name); 1071da177e4SLinus Torvalds for (p = s; *p; p++) 1081da177e4SLinus Torvalds if (*p == '/') 1091da177e4SLinus Torvalds *p = '!'; 110edfaa7c3SKay Sievers res = blk_lookup_devt(s); 1111da177e4SLinus Torvalds if (res) 1121da177e4SLinus Torvalds goto done; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds fail: 115edfaa7c3SKay Sievers return 0; 116edfaa7c3SKay Sievers done: 117edfaa7c3SKay Sievers return res; 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds static int __init root_dev_setup(char *line) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds strlcpy(saved_root_name, line, sizeof(saved_root_name)); 1231da177e4SLinus Torvalds return 1; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds __setup("root=", root_dev_setup); 1271da177e4SLinus Torvalds 128cc1ed754SPierre Ossman static int __init rootwait_setup(char *str) 129cc1ed754SPierre Ossman { 130cc1ed754SPierre Ossman if (*str) 131cc1ed754SPierre Ossman return 0; 132cc1ed754SPierre Ossman root_wait = 1; 133cc1ed754SPierre Ossman return 1; 134cc1ed754SPierre Ossman } 135cc1ed754SPierre Ossman 136cc1ed754SPierre Ossman __setup("rootwait", rootwait_setup); 137cc1ed754SPierre Ossman 1381da177e4SLinus Torvalds static char * __initdata root_mount_data; 1391da177e4SLinus Torvalds static int __init root_data_setup(char *str) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds root_mount_data = str; 1421da177e4SLinus Torvalds return 1; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds static char * __initdata root_fs_names; 1461da177e4SLinus Torvalds static int __init fs_names_setup(char *str) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds root_fs_names = str; 1491da177e4SLinus Torvalds return 1; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds static unsigned int __initdata root_delay; 1531da177e4SLinus Torvalds static int __init root_delay_setup(char *str) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds root_delay = simple_strtoul(str, NULL, 0); 1561da177e4SLinus Torvalds return 1; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds __setup("rootflags=", root_data_setup); 1601da177e4SLinus Torvalds __setup("rootfstype=", fs_names_setup); 1611da177e4SLinus Torvalds __setup("rootdelay=", root_delay_setup); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds static void __init get_fs_names(char *page) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds char *s = page; 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds if (root_fs_names) { 1681da177e4SLinus Torvalds strcpy(page, root_fs_names); 1691da177e4SLinus Torvalds while (*s++) { 1701da177e4SLinus Torvalds if (s[-1] == ',') 1711da177e4SLinus Torvalds s[-1] = '\0'; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds } else { 1741da177e4SLinus Torvalds int len = get_filesystem_list(page); 1751da177e4SLinus Torvalds char *p, *next; 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds page[len] = '\0'; 1781da177e4SLinus Torvalds for (p = page-1; p; p = next) { 1791da177e4SLinus Torvalds next = strchr(++p, '\n'); 1801da177e4SLinus Torvalds if (*p++ != '\t') 1811da177e4SLinus Torvalds continue; 1821da177e4SLinus Torvalds while ((*s++ = *p++) != '\n') 1831da177e4SLinus Torvalds ; 1841da177e4SLinus Torvalds s[-1] = '\0'; 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds *s = '\0'; 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static int __init do_mount_root(char *name, char *fs, int flags, void *data) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds int err = sys_mount(name, "/root", fs, flags, data); 1931da177e4SLinus Torvalds if (err) 1941da177e4SLinus Torvalds return err; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds sys_chdir("/root"); 1971da177e4SLinus Torvalds ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev; 1981da177e4SLinus Torvalds printk("VFS: Mounted root (%s filesystem)%s.\n", 1991da177e4SLinus Torvalds current->fs->pwdmnt->mnt_sb->s_type->name, 2001da177e4SLinus Torvalds current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? 2011da177e4SLinus Torvalds " readonly" : ""); 2021da177e4SLinus Torvalds return 0; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds void __init mount_block_root(char *name, int flags) 2061da177e4SLinus Torvalds { 2071da177e4SLinus Torvalds char *fs_names = __getname(); 2081da177e4SLinus Torvalds char *p; 2099361401eSDavid Howells #ifdef CONFIG_BLOCK 2101da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 2119361401eSDavid Howells #else 2129361401eSDavid Howells const char *b = name; 2139361401eSDavid Howells #endif 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds get_fs_names(fs_names); 2161da177e4SLinus Torvalds retry: 2171da177e4SLinus Torvalds for (p = fs_names; *p; p += strlen(p)+1) { 2181da177e4SLinus Torvalds int err = do_mount_root(name, p, flags, root_mount_data); 2191da177e4SLinus Torvalds switch (err) { 2201da177e4SLinus Torvalds case 0: 2211da177e4SLinus Torvalds goto out; 2221da177e4SLinus Torvalds case -EACCES: 2231da177e4SLinus Torvalds flags |= MS_RDONLY; 2241da177e4SLinus Torvalds goto retry; 2251da177e4SLinus Torvalds case -EINVAL: 2261da177e4SLinus Torvalds continue; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds /* 2291da177e4SLinus Torvalds * Allow the user to distinguish between failed sys_open 2301da177e4SLinus Torvalds * and bad superblock on root device. 231dd2a345fSDave Gilbert * and give them a list of the available devices 2321da177e4SLinus Torvalds */ 2339361401eSDavid Howells #ifdef CONFIG_BLOCK 2341da177e4SLinus Torvalds __bdevname(ROOT_DEV, b); 2359361401eSDavid Howells #endif 2361da177e4SLinus Torvalds printk("VFS: Cannot open root device \"%s\" or %s\n", 2371da177e4SLinus Torvalds root_device_name, b); 238dd2a345fSDave Gilbert printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 2391da177e4SLinus Torvalds 240dd2a345fSDave Gilbert printk_all_partitions(); 2411da177e4SLinus Torvalds panic("VFS: Unable to mount root fs on %s", b); 2421da177e4SLinus Torvalds } 243be6e028bSAndy Whitcroft 244dd2a345fSDave Gilbert printk("List of all partitions:\n"); 245dd2a345fSDave Gilbert printk_all_partitions(); 246be6e028bSAndy Whitcroft printk("No filesystem could mount root, tried: "); 247be6e028bSAndy Whitcroft for (p = fs_names; *p; p += strlen(p)+1) 248be6e028bSAndy Whitcroft printk(" %s", p); 249be6e028bSAndy Whitcroft printk("\n"); 2509361401eSDavid Howells #ifdef CONFIG_BLOCK 2519361401eSDavid Howells __bdevname(ROOT_DEV, b); 2529361401eSDavid Howells #endif 2539361401eSDavid Howells panic("VFS: Unable to mount root fs on %s", b); 2541da177e4SLinus Torvalds out: 2551da177e4SLinus Torvalds putname(fs_names); 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 2591da177e4SLinus Torvalds static int __init mount_nfs_root(void) 2601da177e4SLinus Torvalds { 2611da177e4SLinus Torvalds void *data = nfs_root_data(); 2621da177e4SLinus Torvalds 263bdaf8529SGreg Kroah-Hartman create_dev("/dev/root", ROOT_DEV); 2641da177e4SLinus Torvalds if (data && 2651da177e4SLinus Torvalds do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) 2661da177e4SLinus Torvalds return 1; 2671da177e4SLinus Torvalds return 0; 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds #endif 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 2721da177e4SLinus Torvalds void __init change_floppy(char *fmt, ...) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds struct termios termios; 2751da177e4SLinus Torvalds char buf[80]; 2761da177e4SLinus Torvalds char c; 2771da177e4SLinus Torvalds int fd; 2781da177e4SLinus Torvalds va_list args; 2791da177e4SLinus Torvalds va_start(args, fmt); 2801da177e4SLinus Torvalds vsprintf(buf, fmt, args); 2811da177e4SLinus Torvalds va_end(args); 2821da177e4SLinus Torvalds fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 2831da177e4SLinus Torvalds if (fd >= 0) { 2841da177e4SLinus Torvalds sys_ioctl(fd, FDEJECT, 0); 2851da177e4SLinus Torvalds sys_close(fd); 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 2881da177e4SLinus Torvalds fd = sys_open("/dev/console", O_RDWR, 0); 2891da177e4SLinus Torvalds if (fd >= 0) { 2901da177e4SLinus Torvalds sys_ioctl(fd, TCGETS, (long)&termios); 2911da177e4SLinus Torvalds termios.c_lflag &= ~ICANON; 2921da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 2931da177e4SLinus Torvalds sys_read(fd, &c, 1); 2941da177e4SLinus Torvalds termios.c_lflag |= ICANON; 2951da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 2961da177e4SLinus Torvalds sys_close(fd); 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds #endif 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds void __init mount_root(void) 3021da177e4SLinus Torvalds { 3031da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 3041da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { 3051da177e4SLinus Torvalds if (mount_nfs_root()) 3061da177e4SLinus Torvalds return; 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 3091da177e4SLinus Torvalds ROOT_DEV = Root_FD0; 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds #endif 3121da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_FD 3131da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 3141da177e4SLinus Torvalds /* rd_doload is 2 for a dual initrd/ramload setup */ 3151da177e4SLinus Torvalds if (rd_doload==2) { 3161da177e4SLinus Torvalds if (rd_load_disk(1)) { 3171da177e4SLinus Torvalds ROOT_DEV = Root_RAM1; 3181da177e4SLinus Torvalds root_device_name = NULL; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds } else 3211da177e4SLinus Torvalds change_floppy("root floppy"); 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds #endif 3249361401eSDavid Howells #ifdef CONFIG_BLOCK 325bdaf8529SGreg Kroah-Hartman create_dev("/dev/root", ROOT_DEV); 3261da177e4SLinus Torvalds mount_block_root("/dev/root", root_mountflags); 3279361401eSDavid Howells #endif 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds /* 3311da177e4SLinus Torvalds * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 3321da177e4SLinus Torvalds */ 3331da177e4SLinus Torvalds void __init prepare_namespace(void) 3341da177e4SLinus Torvalds { 3351da177e4SLinus Torvalds int is_floppy; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if (root_delay) { 3381da177e4SLinus Torvalds printk(KERN_INFO "Waiting %dsec before mounting root device...\n", 3391da177e4SLinus Torvalds root_delay); 3401da177e4SLinus Torvalds ssleep(root_delay); 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 343d779249eSGreg Kroah-Hartman /* wait for the known devices to complete their probing */ 344d779249eSGreg Kroah-Hartman while (driver_probe_done() != 0) 345d779249eSGreg Kroah-Hartman msleep(100); 346d779249eSGreg Kroah-Hartman 3471da177e4SLinus Torvalds md_run_setup(); 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds if (saved_root_name[0]) { 3501da177e4SLinus Torvalds root_device_name = saved_root_name; 351e9482b43SJoern Engel if (!strncmp(root_device_name, "mtd", 3)) { 352e9482b43SJoern Engel mount_block_root(root_device_name, root_mountflags); 353e9482b43SJoern Engel goto out; 354e9482b43SJoern Engel } 3551da177e4SLinus Torvalds ROOT_DEV = name_to_dev_t(root_device_name); 3561da177e4SLinus Torvalds if (strncmp(root_device_name, "/dev/", 5) == 0) 3571da177e4SLinus Torvalds root_device_name += 5; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds if (initrd_load()) 3611da177e4SLinus Torvalds goto out; 3621da177e4SLinus Torvalds 363cc1ed754SPierre Ossman /* wait for any asynchronous scanning to complete */ 364cc1ed754SPierre Ossman if ((ROOT_DEV == 0) && root_wait) { 365cc1ed754SPierre Ossman printk(KERN_INFO "Waiting for root device %s...\n", 366cc1ed754SPierre Ossman saved_root_name); 367cc1ed754SPierre Ossman while (driver_probe_done() != 0 || 368cc1ed754SPierre Ossman (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 369cc1ed754SPierre Ossman msleep(100); 370cc1ed754SPierre Ossman } 371cc1ed754SPierre Ossman 372cc1ed754SPierre Ossman is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 373cc1ed754SPierre Ossman 3741da177e4SLinus Torvalds if (is_floppy && rd_doload && rd_load_disk(0)) 3751da177e4SLinus Torvalds ROOT_DEV = Root_RAM0; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds mount_root(); 3781da177e4SLinus Torvalds out: 3791da177e4SLinus Torvalds sys_mount(".", "/", NULL, MS_MOVE, NULL); 3801da177e4SLinus Torvalds sys_chroot("."); 3811da177e4SLinus Torvalds security_sb_post_mountroot(); 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 384