1c67e5382SH Hartley Sweeten /* 2c67e5382SH Hartley Sweeten * Many of the syscalls used in this file expect some of the arguments 3c67e5382SH Hartley Sweeten * to be __user pointers not __kernel pointers. To limit the sparse 4c67e5382SH Hartley Sweeten * noise, turn off sparse checking for this file. 5c67e5382SH Hartley Sweeten */ 6c67e5382SH Hartley Sweeten #ifdef __CHECKER__ 7c67e5382SH Hartley Sweeten #undef __CHECKER__ 8c67e5382SH Hartley Sweeten #warning "Sparse checking disabled for this file" 9c67e5382SH Hartley Sweeten #endif 10c67e5382SH Hartley Sweeten 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/sched.h> 131da177e4SLinus Torvalds #include <linux/ctype.h> 141da177e4SLinus Torvalds #include <linux/fd.h> 151da177e4SLinus Torvalds #include <linux/tty.h> 161da177e4SLinus Torvalds #include <linux/suspend.h> 171da177e4SLinus Torvalds #include <linux/root_dev.h> 181da177e4SLinus Torvalds #include <linux/security.h> 191da177e4SLinus Torvalds #include <linux/delay.h> 20dd2a345fSDave Gilbert #include <linux/genhd.h> 21d53d9f16SAndrew Morton #include <linux/mount.h> 22d779249eSGreg Kroah-Hartman #include <linux/device.h> 2346595390SAdrian Bunk #include <linux/init.h> 24011e3fcdSAdrian Bunk #include <linux/fs.h> 2582c8253aSAdrian Bunk #include <linux/initrd.h> 2622a9d645SArjan van de Ven #include <linux/async.h> 275ad4e53bSAl Viro #include <linux/fs_struct.h> 285a0e3ad6STejun Heo #include <linux/slab.h> 2957f150a5SRob Landley #include <linux/ramfs.h> 3016203a7aSRob Landley #include <linux/shmem_fs.h> 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include <linux/nfs_fs.h> 331da177e4SLinus Torvalds #include <linux/nfs_fs_sb.h> 341da177e4SLinus Torvalds #include <linux/nfs_mount.h> 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds #include "do_mounts.h" 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 391da177e4SLinus Torvalds 409b04c997STheodore Ts'o int root_mountflags = MS_RDONLY | MS_SILENT; 41f56f6d30SAdrian Bunk static char * __initdata root_device_name; 421da177e4SLinus Torvalds static char __initdata saved_root_name[64]; 4379975f13SWill Drewry static int root_wait; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds dev_t ROOT_DEV; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds static int __init load_ramdisk(char *str) 481da177e4SLinus Torvalds { 491da177e4SLinus Torvalds rd_doload = simple_strtol(str,NULL,0) & 3; 501da177e4SLinus Torvalds return 1; 511da177e4SLinus Torvalds } 521da177e4SLinus Torvalds __setup("load_ramdisk=", load_ramdisk); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static int __init readonly(char *str) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds if (*str) 571da177e4SLinus Torvalds return 0; 581da177e4SLinus Torvalds root_mountflags |= MS_RDONLY; 591da177e4SLinus Torvalds return 1; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds static int __init readwrite(char *str) 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds if (*str) 651da177e4SLinus Torvalds return 0; 661da177e4SLinus Torvalds root_mountflags &= ~MS_RDONLY; 671da177e4SLinus Torvalds return 1; 681da177e4SLinus Torvalds } 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds __setup("ro", readonly); 711da177e4SLinus Torvalds __setup("rw", readwrite); 721da177e4SLinus Torvalds 736d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 741ad7e899SStephen Warren struct uuidcmp { 751ad7e899SStephen Warren const char *uuid; 761ad7e899SStephen Warren int len; 771ad7e899SStephen Warren }; 781ad7e899SStephen Warren 79b5af921eSWill Drewry /** 80b5af921eSWill Drewry * match_dev_by_uuid - callback for finding a partition using its uuid 81b5af921eSWill Drewry * @dev: device passed in by the caller 821ad7e899SStephen Warren * @data: opaque pointer to the desired struct uuidcmp to match 83b5af921eSWill Drewry * 84b5af921eSWill Drewry * Returns 1 if the device matches, and 0 otherwise. 85b5af921eSWill Drewry */ 869f3b795aSMichał Mirosław static int match_dev_by_uuid(struct device *dev, const void *data) 87b5af921eSWill Drewry { 889f3b795aSMichał Mirosław const struct uuidcmp *cmp = data; 89b5af921eSWill Drewry struct hd_struct *part = dev_to_part(dev); 90b5af921eSWill Drewry 91b5af921eSWill Drewry if (!part->info) 92b5af921eSWill Drewry goto no_match; 93b5af921eSWill Drewry 941ad7e899SStephen Warren if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) 95b5af921eSWill Drewry goto no_match; 96b5af921eSWill Drewry 97b5af921eSWill Drewry return 1; 98b5af921eSWill Drewry no_match: 99b5af921eSWill Drewry return 0; 100b5af921eSWill Drewry } 101b5af921eSWill Drewry 102b5af921eSWill Drewry 103b5af921eSWill Drewry /** 104b5af921eSWill Drewry * devt_from_partuuid - looks up the dev_t of a partition by its UUID 105a68b3108Schishanmingshen * @uuid_str: char array containing ascii UUID 106b5af921eSWill Drewry * 107b5af921eSWill Drewry * The function will return the first partition which contains a matching 108b5af921eSWill Drewry * UUID value in its partition_meta_info struct. This does not search 109b5af921eSWill Drewry * by filesystem UUIDs. 110b5af921eSWill Drewry * 111a68b3108Schishanmingshen * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be 11279975f13SWill Drewry * extracted and used as an offset from the partition identified by the UUID. 11379975f13SWill Drewry * 114b5af921eSWill Drewry * Returns the matching dev_t on success or 0 on failure. 115b5af921eSWill Drewry */ 1161ad7e899SStephen Warren static dev_t devt_from_partuuid(const char *uuid_str) 117b5af921eSWill Drewry { 118b5af921eSWill Drewry dev_t res = 0; 1191ad7e899SStephen Warren struct uuidcmp cmp; 120b5af921eSWill Drewry struct device *dev = NULL; 12179975f13SWill Drewry struct gendisk *disk; 12279975f13SWill Drewry struct hd_struct *part; 12379975f13SWill Drewry int offset = 0; 124283f8fc0SStephen Warren bool clear_root_wait = false; 125283f8fc0SStephen Warren char *slash; 12679975f13SWill Drewry 1271ad7e899SStephen Warren cmp.uuid = uuid_str; 1281ad7e899SStephen Warren 129283f8fc0SStephen Warren slash = strchr(uuid_str, '/'); 13079975f13SWill Drewry /* Check for optional partition number offset attributes. */ 131283f8fc0SStephen Warren if (slash) { 13279975f13SWill Drewry char c = 0; 13379975f13SWill Drewry /* Explicitly fail on poor PARTUUID syntax. */ 134283f8fc0SStephen Warren if (sscanf(slash + 1, 135283f8fc0SStephen Warren "PARTNROFF=%d%c", &offset, &c) != 1) { 136283f8fc0SStephen Warren clear_root_wait = true; 13779975f13SWill Drewry goto done; 13879975f13SWill Drewry } 139283f8fc0SStephen Warren cmp.len = slash - uuid_str; 140283f8fc0SStephen Warren } else { 141283f8fc0SStephen Warren cmp.len = strlen(uuid_str); 142283f8fc0SStephen Warren } 143283f8fc0SStephen Warren 144283f8fc0SStephen Warren if (!cmp.len) { 145283f8fc0SStephen Warren clear_root_wait = true; 146283f8fc0SStephen Warren goto done; 14779975f13SWill Drewry } 148b5af921eSWill Drewry 1491ad7e899SStephen Warren dev = class_find_device(&block_class, NULL, &cmp, 1501ad7e899SStephen Warren &match_dev_by_uuid); 151b5af921eSWill Drewry if (!dev) 152b5af921eSWill Drewry goto done; 153b5af921eSWill Drewry 154b5af921eSWill Drewry res = dev->devt; 155b5af921eSWill Drewry 15679975f13SWill Drewry /* Attempt to find the partition by offset. */ 15779975f13SWill Drewry if (!offset) 15879975f13SWill Drewry goto no_offset; 15979975f13SWill Drewry 16079975f13SWill Drewry res = 0; 16179975f13SWill Drewry disk = part_to_disk(dev_to_part(dev)); 16279975f13SWill Drewry part = disk_get_part(disk, dev_to_part(dev)->partno + offset); 16379975f13SWill Drewry if (part) { 16479975f13SWill Drewry res = part_devt(part); 16579975f13SWill Drewry put_device(part_to_dev(part)); 16679975f13SWill Drewry } 16779975f13SWill Drewry 16879975f13SWill Drewry no_offset: 16979975f13SWill Drewry put_device(dev); 170b5af921eSWill Drewry done: 171283f8fc0SStephen Warren if (clear_root_wait) { 172283f8fc0SStephen Warren pr_err("VFS: PARTUUID= is invalid.\n" 173283f8fc0SStephen Warren "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); 174283f8fc0SStephen Warren if (root_wait) 175283f8fc0SStephen Warren pr_err("Disabling rootwait; root= is invalid.\n"); 176283f8fc0SStephen Warren root_wait = 0; 177283f8fc0SStephen Warren } 178b5af921eSWill Drewry return res; 179b5af921eSWill Drewry } 1806d0aed7aSJens Axboe #endif 181b5af921eSWill Drewry 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * Convert a name into device number. We accept the following variants: 1841da177e4SLinus Torvalds * 1851da177e4SLinus Torvalds * 1) device number in hexadecimal represents itself 1861da177e4SLinus Torvalds * 2) /dev/nfs represents Root_NFS (0xff) 1871da177e4SLinus Torvalds * 3) /dev/<disk_name> represents the device number of disk 1881da177e4SLinus Torvalds * 4) /dev/<disk_name><decimal> represents the device number 1891da177e4SLinus Torvalds * of partition - device number of disk plus the partition number 1901da177e4SLinus Torvalds * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 1911da177e4SLinus Torvalds * used when disk name of partitioned disk ends on a digit. 192b5af921eSWill Drewry * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 193b5af921eSWill Drewry * unique id of a partition if the partition table provides it. 194d33b98fcSStephen Warren * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS 195d33b98fcSStephen Warren * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- 196d33b98fcSStephen Warren * filled hex representation of the 32-bit "NT disk signature", and PP 197d33b98fcSStephen Warren * is a zero-filled hex representation of the 1-based partition number. 19879975f13SWill Drewry * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to 19979975f13SWill Drewry * a partition with a known unique id. 2006c251611SSebastian Capella * 8) <major>:<minor> major and minor number of the device separated by 2016c251611SSebastian Capella * a colon. 2021da177e4SLinus Torvalds * 203edfaa7c3SKay Sievers * If name doesn't have fall into the categories above, we return (0,0). 204edfaa7c3SKay Sievers * block_class is used to check if something is a disk name. If the disk 205edfaa7c3SKay Sievers * name contains slashes, the device name has them replaced with 206edfaa7c3SKay Sievers * bangs. 2071da177e4SLinus Torvalds */ 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds dev_t name_to_dev_t(char *name) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds char s[32]; 2121da177e4SLinus Torvalds char *p; 2131da177e4SLinus Torvalds dev_t res = 0; 21430f2f0ebSKay Sievers int part; 2151da177e4SLinus Torvalds 2166d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 217b5af921eSWill Drewry if (strncmp(name, "PARTUUID=", 9) == 0) { 218b5af921eSWill Drewry name += 9; 219b5af921eSWill Drewry res = devt_from_partuuid(name); 220b5af921eSWill Drewry if (!res) 221b5af921eSWill Drewry goto fail; 222b5af921eSWill Drewry goto done; 223b5af921eSWill Drewry } 2246d0aed7aSJens Axboe #endif 225b5af921eSWill Drewry 2261da177e4SLinus Torvalds if (strncmp(name, "/dev/", 5) != 0) { 2271da177e4SLinus Torvalds unsigned maj, min; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds if (sscanf(name, "%u:%u", &maj, &min) == 2) { 2301da177e4SLinus Torvalds res = MKDEV(maj, min); 2311da177e4SLinus Torvalds if (maj != MAJOR(res) || min != MINOR(res)) 2321da177e4SLinus Torvalds goto fail; 2331da177e4SLinus Torvalds } else { 2341da177e4SLinus Torvalds res = new_decode_dev(simple_strtoul(name, &p, 16)); 2351da177e4SLinus Torvalds if (*p) 2361da177e4SLinus Torvalds goto fail; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds goto done; 2391da177e4SLinus Torvalds } 240edfaa7c3SKay Sievers 2411da177e4SLinus Torvalds name += 5; 2421da177e4SLinus Torvalds res = Root_NFS; 2431da177e4SLinus Torvalds if (strcmp(name, "nfs") == 0) 2441da177e4SLinus Torvalds goto done; 2451da177e4SLinus Torvalds res = Root_RAM0; 2461da177e4SLinus Torvalds if (strcmp(name, "ram") == 0) 2471da177e4SLinus Torvalds goto done; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds if (strlen(name) > 31) 2501da177e4SLinus Torvalds goto fail; 2511da177e4SLinus Torvalds strcpy(s, name); 2521da177e4SLinus Torvalds for (p = s; *p; p++) 2531da177e4SLinus Torvalds if (*p == '/') 2541da177e4SLinus Torvalds *p = '!'; 25530f2f0ebSKay Sievers res = blk_lookup_devt(s, 0); 25630f2f0ebSKay Sievers if (res) 25730f2f0ebSKay Sievers goto done; 25830f2f0ebSKay Sievers 25930f2f0ebSKay Sievers /* 26025985edcSLucas De Marchi * try non-existent, but valid partition, which may only exist 26130f2f0ebSKay Sievers * after revalidating the disk, like partitioned md devices 26230f2f0ebSKay Sievers */ 26330f2f0ebSKay Sievers while (p > s && isdigit(p[-1])) 26430f2f0ebSKay Sievers p--; 26530f2f0ebSKay Sievers if (p == s || !*p || *p == '0') 26630f2f0ebSKay Sievers goto fail; 26730f2f0ebSKay Sievers 26830f2f0ebSKay Sievers /* try disk name without <part number> */ 26930f2f0ebSKay Sievers part = simple_strtoul(p, NULL, 10); 27030f2f0ebSKay Sievers *p = '\0'; 27130f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 27230f2f0ebSKay Sievers if (res) 27330f2f0ebSKay Sievers goto done; 27430f2f0ebSKay Sievers 27530f2f0ebSKay Sievers /* try disk name without p<part number> */ 27630f2f0ebSKay Sievers if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') 27730f2f0ebSKay Sievers goto fail; 27830f2f0ebSKay Sievers p[-1] = '\0'; 27930f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 2801da177e4SLinus Torvalds if (res) 2811da177e4SLinus Torvalds goto done; 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds fail: 284edfaa7c3SKay Sievers return 0; 285edfaa7c3SKay Sievers done: 286edfaa7c3SKay Sievers return res; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static int __init root_dev_setup(char *line) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds strlcpy(saved_root_name, line, sizeof(saved_root_name)); 2921da177e4SLinus Torvalds return 1; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds __setup("root=", root_dev_setup); 2961da177e4SLinus Torvalds 297cc1ed754SPierre Ossman static int __init rootwait_setup(char *str) 298cc1ed754SPierre Ossman { 299cc1ed754SPierre Ossman if (*str) 300cc1ed754SPierre Ossman return 0; 301cc1ed754SPierre Ossman root_wait = 1; 302cc1ed754SPierre Ossman return 1; 303cc1ed754SPierre Ossman } 304cc1ed754SPierre Ossman 305cc1ed754SPierre Ossman __setup("rootwait", rootwait_setup); 306cc1ed754SPierre Ossman 3071da177e4SLinus Torvalds static char * __initdata root_mount_data; 3081da177e4SLinus Torvalds static int __init root_data_setup(char *str) 3091da177e4SLinus Torvalds { 3101da177e4SLinus Torvalds root_mount_data = str; 3111da177e4SLinus Torvalds return 1; 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds static char * __initdata root_fs_names; 3151da177e4SLinus Torvalds static int __init fs_names_setup(char *str) 3161da177e4SLinus Torvalds { 3171da177e4SLinus Torvalds root_fs_names = str; 3181da177e4SLinus Torvalds return 1; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds static unsigned int __initdata root_delay; 3221da177e4SLinus Torvalds static int __init root_delay_setup(char *str) 3231da177e4SLinus Torvalds { 3241da177e4SLinus Torvalds root_delay = simple_strtoul(str, NULL, 0); 3251da177e4SLinus Torvalds return 1; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds __setup("rootflags=", root_data_setup); 3291da177e4SLinus Torvalds __setup("rootfstype=", fs_names_setup); 3301da177e4SLinus Torvalds __setup("rootdelay=", root_delay_setup); 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds static void __init get_fs_names(char *page) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds char *s = page; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds if (root_fs_names) { 3371da177e4SLinus Torvalds strcpy(page, root_fs_names); 3381da177e4SLinus Torvalds while (*s++) { 3391da177e4SLinus Torvalds if (s[-1] == ',') 3401da177e4SLinus Torvalds s[-1] = '\0'; 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds } else { 3431da177e4SLinus Torvalds int len = get_filesystem_list(page); 3441da177e4SLinus Torvalds char *p, *next; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds page[len] = '\0'; 3471da177e4SLinus Torvalds for (p = page-1; p; p = next) { 3481da177e4SLinus Torvalds next = strchr(++p, '\n'); 3491da177e4SLinus Torvalds if (*p++ != '\t') 3501da177e4SLinus Torvalds continue; 3511da177e4SLinus Torvalds while ((*s++ = *p++) != '\n') 3521da177e4SLinus Torvalds ; 3531da177e4SLinus Torvalds s[-1] = '\0'; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds *s = '\0'; 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds static int __init do_mount_root(char *name, char *fs, int flags, void *data) 3601da177e4SLinus Torvalds { 361d8c9584eSAl Viro struct super_block *s; 3621da177e4SLinus Torvalds int err = sys_mount(name, "/root", fs, flags, data); 3631da177e4SLinus Torvalds if (err) 3641da177e4SLinus Torvalds return err; 3651da177e4SLinus Torvalds 366c67e5382SH Hartley Sweeten sys_chdir("/root"); 367d8c9584eSAl Viro s = current->fs->pwd.dentry->d_sb; 368d8c9584eSAl Viro ROOT_DEV = s->s_dev; 36980cdc6daSMandeep Singh Baines printk(KERN_INFO 37080cdc6daSMandeep Singh Baines "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", 371d8c9584eSAl Viro s->s_type->name, 372d8c9584eSAl Viro s->s_flags & MS_RDONLY ? " readonly" : "", 373d8c9584eSAl Viro MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); 3741da177e4SLinus Torvalds return 0; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds void __init mount_block_root(char *name, int flags) 3781da177e4SLinus Torvalds { 379a608ca21SJeff Layton struct page *page = alloc_page(GFP_KERNEL | 380a608ca21SJeff Layton __GFP_NOTRACK_FALSE_POSITIVE); 381a608ca21SJeff Layton char *fs_names = page_address(page); 3821da177e4SLinus Torvalds char *p; 3839361401eSDavid Howells #ifdef CONFIG_BLOCK 3841da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3859361401eSDavid Howells #else 3869361401eSDavid Howells const char *b = name; 3879361401eSDavid Howells #endif 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds get_fs_names(fs_names); 3901da177e4SLinus Torvalds retry: 3911da177e4SLinus Torvalds for (p = fs_names; *p; p += strlen(p)+1) { 3921da177e4SLinus Torvalds int err = do_mount_root(name, p, flags, root_mount_data); 3931da177e4SLinus Torvalds switch (err) { 3941da177e4SLinus Torvalds case 0: 3951da177e4SLinus Torvalds goto out; 3961da177e4SLinus Torvalds case -EACCES: 3971da177e4SLinus Torvalds flags |= MS_RDONLY; 3981da177e4SLinus Torvalds goto retry; 3991da177e4SLinus Torvalds case -EINVAL: 4001da177e4SLinus Torvalds continue; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds /* 4031da177e4SLinus Torvalds * Allow the user to distinguish between failed sys_open 4041da177e4SLinus Torvalds * and bad superblock on root device. 405dd2a345fSDave Gilbert * and give them a list of the available devices 4061da177e4SLinus Torvalds */ 4079361401eSDavid Howells #ifdef CONFIG_BLOCK 4081da177e4SLinus Torvalds __bdevname(ROOT_DEV, b); 4099361401eSDavid Howells #endif 4100e0cb892SBernhard Walle printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", 4110e0cb892SBernhard Walle root_device_name, b, err); 412dd2a345fSDave Gilbert printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 4131da177e4SLinus Torvalds 414dd2a345fSDave Gilbert printk_all_partitions(); 41555dc7db7STejun Heo #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT 41655dc7db7STejun Heo printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " 41755dc7db7STejun Heo "explicit textual name for \"root=\" boot option.\n"); 41855dc7db7STejun Heo #endif 4191da177e4SLinus Torvalds panic("VFS: Unable to mount root fs on %s", b); 4201da177e4SLinus Torvalds } 421be6e028bSAndy Whitcroft 422dd2a345fSDave Gilbert printk("List of all partitions:\n"); 423dd2a345fSDave Gilbert printk_all_partitions(); 424be6e028bSAndy Whitcroft printk("No filesystem could mount root, tried: "); 425be6e028bSAndy Whitcroft for (p = fs_names; *p; p += strlen(p)+1) 426be6e028bSAndy Whitcroft printk(" %s", p); 427be6e028bSAndy Whitcroft printk("\n"); 4289361401eSDavid Howells #ifdef CONFIG_BLOCK 4299361401eSDavid Howells __bdevname(ROOT_DEV, b); 4309361401eSDavid Howells #endif 4319361401eSDavid Howells panic("VFS: Unable to mount root fs on %s", b); 4321da177e4SLinus Torvalds out: 433a608ca21SJeff Layton put_page(page); 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 43743717c7dSChuck Lever 43843717c7dSChuck Lever #define NFSROOT_TIMEOUT_MIN 5 43943717c7dSChuck Lever #define NFSROOT_TIMEOUT_MAX 30 44043717c7dSChuck Lever #define NFSROOT_RETRY_MAX 5 44143717c7dSChuck Lever 4421da177e4SLinus Torvalds static int __init mount_nfs_root(void) 4431da177e4SLinus Torvalds { 44456463e50SChuck Lever char *root_dev, *root_data; 44543717c7dSChuck Lever unsigned int timeout; 44643717c7dSChuck Lever int try, err; 4471da177e4SLinus Torvalds 44843717c7dSChuck Lever err = nfs_root_data(&root_dev, &root_data); 44943717c7dSChuck Lever if (err != 0) 4501da177e4SLinus Torvalds return 0; 45143717c7dSChuck Lever 45243717c7dSChuck Lever /* 45343717c7dSChuck Lever * The server or network may not be ready, so try several 45443717c7dSChuck Lever * times. Stop after a few tries in case the client wants 45543717c7dSChuck Lever * to fall back to other boot methods. 45643717c7dSChuck Lever */ 45743717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MIN; 45843717c7dSChuck Lever for (try = 1; ; try++) { 45943717c7dSChuck Lever err = do_mount_root(root_dev, "nfs", 46043717c7dSChuck Lever root_mountflags, root_data); 46143717c7dSChuck Lever if (err == 0) 46256463e50SChuck Lever return 1; 46343717c7dSChuck Lever if (try > NFSROOT_RETRY_MAX) 46443717c7dSChuck Lever break; 46543717c7dSChuck Lever 46643717c7dSChuck Lever /* Wait, in case the server refused us immediately */ 46743717c7dSChuck Lever ssleep(timeout); 46843717c7dSChuck Lever timeout <<= 1; 46943717c7dSChuck Lever if (timeout > NFSROOT_TIMEOUT_MAX) 47043717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MAX; 47143717c7dSChuck Lever } 47243717c7dSChuck Lever return 0; 4731da177e4SLinus Torvalds } 4741da177e4SLinus Torvalds #endif 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 4771da177e4SLinus Torvalds void __init change_floppy(char *fmt, ...) 4781da177e4SLinus Torvalds { 4791da177e4SLinus Torvalds struct termios termios; 4801da177e4SLinus Torvalds char buf[80]; 4811da177e4SLinus Torvalds char c; 4821da177e4SLinus Torvalds int fd; 4831da177e4SLinus Torvalds va_list args; 4841da177e4SLinus Torvalds va_start(args, fmt); 4851da177e4SLinus Torvalds vsprintf(buf, fmt, args); 4861da177e4SLinus Torvalds va_end(args); 4871da177e4SLinus Torvalds fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 4881da177e4SLinus Torvalds if (fd >= 0) { 4891da177e4SLinus Torvalds sys_ioctl(fd, FDEJECT, 0); 4901da177e4SLinus Torvalds sys_close(fd); 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 4931da177e4SLinus Torvalds fd = sys_open("/dev/console", O_RDWR, 0); 4941da177e4SLinus Torvalds if (fd >= 0) { 4951da177e4SLinus Torvalds sys_ioctl(fd, TCGETS, (long)&termios); 4961da177e4SLinus Torvalds termios.c_lflag &= ~ICANON; 4971da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 4981da177e4SLinus Torvalds sys_read(fd, &c, 1); 4991da177e4SLinus Torvalds termios.c_lflag |= ICANON; 5001da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 5011da177e4SLinus Torvalds sys_close(fd); 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds #endif 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds void __init mount_root(void) 5071da177e4SLinus Torvalds { 5081da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 509377485f6SSasha Levin if (ROOT_DEV == Root_NFS) { 5101da177e4SLinus Torvalds if (mount_nfs_root()) 5111da177e4SLinus Torvalds return; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 5141da177e4SLinus Torvalds ROOT_DEV = Root_FD0; 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds #endif 5171da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_FD 5181da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 5191da177e4SLinus Torvalds /* rd_doload is 2 for a dual initrd/ramload setup */ 5201da177e4SLinus Torvalds if (rd_doload==2) { 5211da177e4SLinus Torvalds if (rd_load_disk(1)) { 5221da177e4SLinus Torvalds ROOT_DEV = Root_RAM1; 5231da177e4SLinus Torvalds root_device_name = NULL; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds } else 5261da177e4SLinus Torvalds change_floppy("root floppy"); 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds #endif 5299361401eSDavid Howells #ifdef CONFIG_BLOCK 530bdaf8529SGreg Kroah-Hartman create_dev("/dev/root", ROOT_DEV); 5311da177e4SLinus Torvalds mount_block_root("/dev/root", root_mountflags); 5329361401eSDavid Howells #endif 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /* 5361da177e4SLinus Torvalds * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds void __init prepare_namespace(void) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds int is_floppy; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds if (root_delay) { 5431da177e4SLinus Torvalds printk(KERN_INFO "Waiting %d sec before mounting root device...\n", 5441da177e4SLinus Torvalds root_delay); 5451da177e4SLinus Torvalds ssleep(root_delay); 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 548216773a7SArjan van de Ven /* 549216773a7SArjan van de Ven * wait for the known devices to complete their probing 550216773a7SArjan van de Ven * 551216773a7SArjan van de Ven * Note: this is a potential source of long boot delays. 552216773a7SArjan van de Ven * For example, it is not atypical to wait 5 seconds here 553216773a7SArjan van de Ven * for the touchpad of a laptop to initialize. 554216773a7SArjan van de Ven */ 555216773a7SArjan van de Ven wait_for_device_probe(); 556d779249eSGreg Kroah-Hartman 5571da177e4SLinus Torvalds md_run_setup(); 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds if (saved_root_name[0]) { 5601da177e4SLinus Torvalds root_device_name = saved_root_name; 5612d62f488SAdrian Hunter if (!strncmp(root_device_name, "mtd", 3) || 5622d62f488SAdrian Hunter !strncmp(root_device_name, "ubi", 3)) { 563e9482b43SJoern Engel mount_block_root(root_device_name, root_mountflags); 564e9482b43SJoern Engel goto out; 565e9482b43SJoern Engel } 5661da177e4SLinus Torvalds ROOT_DEV = name_to_dev_t(root_device_name); 5671da177e4SLinus Torvalds if (strncmp(root_device_name, "/dev/", 5) == 0) 5681da177e4SLinus Torvalds root_device_name += 5; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds if (initrd_load()) 5721da177e4SLinus Torvalds goto out; 5731da177e4SLinus Torvalds 574cc1ed754SPierre Ossman /* wait for any asynchronous scanning to complete */ 575cc1ed754SPierre Ossman if ((ROOT_DEV == 0) && root_wait) { 576cc1ed754SPierre Ossman printk(KERN_INFO "Waiting for root device %s...\n", 577cc1ed754SPierre Ossman saved_root_name); 578cc1ed754SPierre Ossman while (driver_probe_done() != 0 || 579cc1ed754SPierre Ossman (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 580cc1ed754SPierre Ossman msleep(100); 581216773a7SArjan van de Ven async_synchronize_full(); 582cc1ed754SPierre Ossman } 583cc1ed754SPierre Ossman 584cc1ed754SPierre Ossman is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 585cc1ed754SPierre Ossman 5861da177e4SLinus Torvalds if (is_floppy && rd_doload && rd_load_disk(0)) 5871da177e4SLinus Torvalds ROOT_DEV = Root_RAM0; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds mount_root(); 5901da177e4SLinus Torvalds out: 5912b2af54aSKay Sievers devtmpfs_mount("dev"); 5921da177e4SLinus Torvalds sys_mount(".", "/", NULL, MS_MOVE, NULL); 593c67e5382SH Hartley Sweeten sys_chroot("."); 5941da177e4SLinus Torvalds } 59557f150a5SRob Landley 5966e19ededSRob Landley static bool is_tmpfs; 59757f150a5SRob Landley static struct dentry *rootfs_mount(struct file_system_type *fs_type, 59857f150a5SRob Landley int flags, const char *dev_name, void *data) 59957f150a5SRob Landley { 60057f150a5SRob Landley static unsigned long once; 6016e19ededSRob Landley void *fill = ramfs_fill_super; 60257f150a5SRob Landley 60357f150a5SRob Landley if (test_and_set_bit(0, &once)) 60457f150a5SRob Landley return ERR_PTR(-ENODEV); 60557f150a5SRob Landley 6066e19ededSRob Landley if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) 6076e19ededSRob Landley fill = shmem_fill_super; 6086e19ededSRob Landley 6096e19ededSRob Landley return mount_nodev(fs_type, flags, data, fill); 61057f150a5SRob Landley } 61157f150a5SRob Landley 61257f150a5SRob Landley static struct file_system_type rootfs_fs_type = { 61357f150a5SRob Landley .name = "rootfs", 61457f150a5SRob Landley .mount = rootfs_mount, 61557f150a5SRob Landley .kill_sb = kill_litter_super, 61657f150a5SRob Landley }; 61757f150a5SRob Landley 61857f150a5SRob Landley int __init init_rootfs(void) 61957f150a5SRob Landley { 62057f150a5SRob Landley int err = register_filesystem(&rootfs_fs_type); 62157f150a5SRob Landley 62257f150a5SRob Landley if (err) 62357f150a5SRob Landley return err; 62457f150a5SRob Landley 6256e19ededSRob Landley if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && 6266e19ededSRob Landley (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { 62716203a7aSRob Landley err = shmem_init(); 6286e19ededSRob Landley is_tmpfs = true; 6296e19ededSRob Landley } else { 63057f150a5SRob Landley err = init_ramfs_fs(); 6316e19ededSRob Landley } 63216203a7aSRob Landley 63357f150a5SRob Landley if (err) 63457f150a5SRob Landley unregister_filesystem(&rootfs_fs_type); 63557f150a5SRob Landley 63657f150a5SRob Landley return err; 63757f150a5SRob Landley } 638