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> 14011e3fcdSAdrian Bunk #include <linux/fs.h> 1582c8253aSAdrian Bunk #include <linux/initrd.h> 1622a9d645SArjan van de Ven #include <linux/async.h> 175ad4e53bSAl Viro #include <linux/fs_struct.h> 185a0e3ad6STejun Heo #include <linux/slab.h> 1957f150a5SRob Landley #include <linux/ramfs.h> 2016203a7aSRob Landley #include <linux/shmem_fs.h> 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <linux/nfs_fs.h> 231da177e4SLinus Torvalds #include <linux/nfs_fs_sb.h> 241da177e4SLinus Torvalds #include <linux/nfs_mount.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include "do_mounts.h" 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 291da177e4SLinus Torvalds 309b04c997STheodore Ts'o int root_mountflags = MS_RDONLY | MS_SILENT; 31f56f6d30SAdrian Bunk static char * __initdata root_device_name; 321da177e4SLinus Torvalds static char __initdata saved_root_name[64]; 3379975f13SWill Drewry static int root_wait; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds dev_t ROOT_DEV; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds static int __init load_ramdisk(char *str) 381da177e4SLinus Torvalds { 391da177e4SLinus Torvalds rd_doload = simple_strtol(str,NULL,0) & 3; 401da177e4SLinus Torvalds return 1; 411da177e4SLinus Torvalds } 421da177e4SLinus Torvalds __setup("load_ramdisk=", load_ramdisk); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds static int __init readonly(char *str) 451da177e4SLinus Torvalds { 461da177e4SLinus Torvalds if (*str) 471da177e4SLinus Torvalds return 0; 481da177e4SLinus Torvalds root_mountflags |= MS_RDONLY; 491da177e4SLinus Torvalds return 1; 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds static int __init readwrite(char *str) 531da177e4SLinus Torvalds { 541da177e4SLinus Torvalds if (*str) 551da177e4SLinus Torvalds return 0; 561da177e4SLinus Torvalds root_mountflags &= ~MS_RDONLY; 571da177e4SLinus Torvalds return 1; 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds __setup("ro", readonly); 611da177e4SLinus Torvalds __setup("rw", readwrite); 621da177e4SLinus Torvalds 636d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 641ad7e899SStephen Warren struct uuidcmp { 651ad7e899SStephen Warren const char *uuid; 661ad7e899SStephen Warren int len; 671ad7e899SStephen Warren }; 681ad7e899SStephen Warren 69b5af921eSWill Drewry /** 70b5af921eSWill Drewry * match_dev_by_uuid - callback for finding a partition using its uuid 71b5af921eSWill Drewry * @dev: device passed in by the caller 721ad7e899SStephen Warren * @data: opaque pointer to the desired struct uuidcmp to match 73b5af921eSWill Drewry * 74b5af921eSWill Drewry * Returns 1 if the device matches, and 0 otherwise. 75b5af921eSWill Drewry */ 769f3b795aSMichał Mirosław static int match_dev_by_uuid(struct device *dev, const void *data) 77b5af921eSWill Drewry { 789f3b795aSMichał Mirosław const struct uuidcmp *cmp = data; 79b5af921eSWill Drewry struct hd_struct *part = dev_to_part(dev); 80b5af921eSWill Drewry 81b5af921eSWill Drewry if (!part->info) 82b5af921eSWill Drewry goto no_match; 83b5af921eSWill Drewry 841ad7e899SStephen Warren if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) 85b5af921eSWill Drewry goto no_match; 86b5af921eSWill Drewry 87b5af921eSWill Drewry return 1; 88b5af921eSWill Drewry no_match: 89b5af921eSWill Drewry return 0; 90b5af921eSWill Drewry } 91b5af921eSWill Drewry 92b5af921eSWill Drewry 93b5af921eSWill Drewry /** 94b5af921eSWill Drewry * devt_from_partuuid - looks up the dev_t of a partition by its UUID 95a68b3108Schishanmingshen * @uuid_str: char array containing ascii UUID 96b5af921eSWill Drewry * 97b5af921eSWill Drewry * The function will return the first partition which contains a matching 98b5af921eSWill Drewry * UUID value in its partition_meta_info struct. This does not search 99b5af921eSWill Drewry * by filesystem UUIDs. 100b5af921eSWill Drewry * 101a68b3108Schishanmingshen * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be 10279975f13SWill Drewry * extracted and used as an offset from the partition identified by the UUID. 10379975f13SWill Drewry * 104b5af921eSWill Drewry * Returns the matching dev_t on success or 0 on failure. 105b5af921eSWill Drewry */ 1061ad7e899SStephen Warren static dev_t devt_from_partuuid(const char *uuid_str) 107b5af921eSWill Drewry { 108b5af921eSWill Drewry dev_t res = 0; 1091ad7e899SStephen Warren struct uuidcmp cmp; 110b5af921eSWill Drewry struct device *dev = NULL; 11179975f13SWill Drewry struct gendisk *disk; 11279975f13SWill Drewry struct hd_struct *part; 11379975f13SWill Drewry int offset = 0; 114283f8fc0SStephen Warren bool clear_root_wait = false; 115283f8fc0SStephen Warren char *slash; 11679975f13SWill Drewry 1171ad7e899SStephen Warren cmp.uuid = uuid_str; 1181ad7e899SStephen Warren 119283f8fc0SStephen Warren slash = strchr(uuid_str, '/'); 12079975f13SWill Drewry /* Check for optional partition number offset attributes. */ 121283f8fc0SStephen Warren if (slash) { 12279975f13SWill Drewry char c = 0; 12379975f13SWill Drewry /* Explicitly fail on poor PARTUUID syntax. */ 124283f8fc0SStephen Warren if (sscanf(slash + 1, 125283f8fc0SStephen Warren "PARTNROFF=%d%c", &offset, &c) != 1) { 126283f8fc0SStephen Warren clear_root_wait = true; 12779975f13SWill Drewry goto done; 12879975f13SWill Drewry } 129283f8fc0SStephen Warren cmp.len = slash - uuid_str; 130283f8fc0SStephen Warren } else { 131283f8fc0SStephen Warren cmp.len = strlen(uuid_str); 132283f8fc0SStephen Warren } 133283f8fc0SStephen Warren 134283f8fc0SStephen Warren if (!cmp.len) { 135283f8fc0SStephen Warren clear_root_wait = true; 136283f8fc0SStephen Warren goto done; 13779975f13SWill Drewry } 138b5af921eSWill Drewry 1391ad7e899SStephen Warren dev = class_find_device(&block_class, NULL, &cmp, 1401ad7e899SStephen Warren &match_dev_by_uuid); 141b5af921eSWill Drewry if (!dev) 142b5af921eSWill Drewry goto done; 143b5af921eSWill Drewry 144b5af921eSWill Drewry res = dev->devt; 145b5af921eSWill Drewry 14679975f13SWill Drewry /* Attempt to find the partition by offset. */ 14779975f13SWill Drewry if (!offset) 14879975f13SWill Drewry goto no_offset; 14979975f13SWill Drewry 15079975f13SWill Drewry res = 0; 15179975f13SWill Drewry disk = part_to_disk(dev_to_part(dev)); 15279975f13SWill Drewry part = disk_get_part(disk, dev_to_part(dev)->partno + offset); 15379975f13SWill Drewry if (part) { 15479975f13SWill Drewry res = part_devt(part); 15579975f13SWill Drewry put_device(part_to_dev(part)); 15679975f13SWill Drewry } 15779975f13SWill Drewry 15879975f13SWill Drewry no_offset: 15979975f13SWill Drewry put_device(dev); 160b5af921eSWill Drewry done: 161283f8fc0SStephen Warren if (clear_root_wait) { 162283f8fc0SStephen Warren pr_err("VFS: PARTUUID= is invalid.\n" 163283f8fc0SStephen Warren "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); 164283f8fc0SStephen Warren if (root_wait) 165283f8fc0SStephen Warren pr_err("Disabling rootwait; root= is invalid.\n"); 166283f8fc0SStephen Warren root_wait = 0; 167283f8fc0SStephen Warren } 168b5af921eSWill Drewry return res; 169b5af921eSWill Drewry } 170f027c34dSNikolaus Voss 171f027c34dSNikolaus Voss /** 172f027c34dSNikolaus Voss * match_dev_by_label - callback for finding a partition using its label 173f027c34dSNikolaus Voss * @dev: device passed in by the caller 174f027c34dSNikolaus Voss * @data: opaque pointer to the label to match 175f027c34dSNikolaus Voss * 176f027c34dSNikolaus Voss * Returns 1 if the device matches, and 0 otherwise. 177f027c34dSNikolaus Voss */ 178f027c34dSNikolaus Voss static int match_dev_by_label(struct device *dev, const void *data) 179f027c34dSNikolaus Voss { 180f027c34dSNikolaus Voss const char *label = data; 181f027c34dSNikolaus Voss struct hd_struct *part = dev_to_part(dev); 182f027c34dSNikolaus Voss 183f027c34dSNikolaus Voss if (part->info && !strcmp(label, part->info->volname)) 184f027c34dSNikolaus Voss return 1; 185f027c34dSNikolaus Voss 186f027c34dSNikolaus Voss return 0; 187f027c34dSNikolaus Voss } 1886d0aed7aSJens Axboe #endif 189b5af921eSWill Drewry 1901da177e4SLinus Torvalds /* 1911da177e4SLinus Torvalds * Convert a name into device number. We accept the following variants: 1921da177e4SLinus Torvalds * 1930bf37ae4SPavel Machek * 1) <hex_major><hex_minor> device number in hexadecimal represents itself 1940bf37ae4SPavel Machek * no leading 0x, for example b302. 1951da177e4SLinus Torvalds * 2) /dev/nfs represents Root_NFS (0xff) 1961da177e4SLinus Torvalds * 3) /dev/<disk_name> represents the device number of disk 1971da177e4SLinus Torvalds * 4) /dev/<disk_name><decimal> represents the device number 1981da177e4SLinus Torvalds * of partition - device number of disk plus the partition number 1991da177e4SLinus Torvalds * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 2001da177e4SLinus Torvalds * used when disk name of partitioned disk ends on a digit. 201b5af921eSWill Drewry * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 202b5af921eSWill Drewry * unique id of a partition if the partition table provides it. 203d33b98fcSStephen Warren * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS 204d33b98fcSStephen Warren * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- 205d33b98fcSStephen Warren * filled hex representation of the 32-bit "NT disk signature", and PP 206d33b98fcSStephen Warren * is a zero-filled hex representation of the 1-based partition number. 20779975f13SWill Drewry * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to 20879975f13SWill Drewry * a partition with a known unique id. 2096c251611SSebastian Capella * 8) <major>:<minor> major and minor number of the device separated by 2106c251611SSebastian Capella * a colon. 211f027c34dSNikolaus Voss * 9) PARTLABEL=<name> with name being the GPT partition label. 212f027c34dSNikolaus Voss * MSDOS partitions do not support labels! 2131da177e4SLinus Torvalds * 214edfaa7c3SKay Sievers * If name doesn't have fall into the categories above, we return (0,0). 215edfaa7c3SKay Sievers * block_class is used to check if something is a disk name. If the disk 216edfaa7c3SKay Sievers * name contains slashes, the device name has them replaced with 217edfaa7c3SKay Sievers * bangs. 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds 220e6e20a7aSDan Ehrenberg dev_t name_to_dev_t(const char *name) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds char s[32]; 2231da177e4SLinus Torvalds char *p; 2241da177e4SLinus Torvalds dev_t res = 0; 22530f2f0ebSKay Sievers int part; 2261da177e4SLinus Torvalds 2276d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 228b5af921eSWill Drewry if (strncmp(name, "PARTUUID=", 9) == 0) { 229b5af921eSWill Drewry name += 9; 230b5af921eSWill Drewry res = devt_from_partuuid(name); 231b5af921eSWill Drewry if (!res) 232b5af921eSWill Drewry goto fail; 233b5af921eSWill Drewry goto done; 234f027c34dSNikolaus Voss } else if (strncmp(name, "PARTLABEL=", 10) == 0) { 235f027c34dSNikolaus Voss struct device *dev; 236f027c34dSNikolaus Voss 237f027c34dSNikolaus Voss dev = class_find_device(&block_class, NULL, name + 10, 238f027c34dSNikolaus Voss &match_dev_by_label); 239f027c34dSNikolaus Voss if (!dev) 240f027c34dSNikolaus Voss goto fail; 241f027c34dSNikolaus Voss 242f027c34dSNikolaus Voss res = dev->devt; 243f027c34dSNikolaus Voss put_device(dev); 244f027c34dSNikolaus Voss goto done; 245b5af921eSWill Drewry } 2466d0aed7aSJens Axboe #endif 247b5af921eSWill Drewry 2481da177e4SLinus Torvalds if (strncmp(name, "/dev/", 5) != 0) { 249cb31ef48SChen Yu unsigned maj, min, offset; 250283e7ad0SDan Ehrenberg char dummy; 2511da177e4SLinus Torvalds 252cb31ef48SChen Yu if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) || 253cb31ef48SChen Yu (sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) { 2541da177e4SLinus Torvalds res = MKDEV(maj, min); 2551da177e4SLinus Torvalds if (maj != MAJOR(res) || min != MINOR(res)) 2561da177e4SLinus Torvalds goto fail; 2571da177e4SLinus Torvalds } else { 2581da177e4SLinus Torvalds res = new_decode_dev(simple_strtoul(name, &p, 16)); 2591da177e4SLinus Torvalds if (*p) 2601da177e4SLinus Torvalds goto fail; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds goto done; 2631da177e4SLinus Torvalds } 264edfaa7c3SKay Sievers 2651da177e4SLinus Torvalds name += 5; 2661da177e4SLinus Torvalds res = Root_NFS; 2671da177e4SLinus Torvalds if (strcmp(name, "nfs") == 0) 2681da177e4SLinus Torvalds goto done; 2691da177e4SLinus Torvalds res = Root_RAM0; 2701da177e4SLinus Torvalds if (strcmp(name, "ram") == 0) 2711da177e4SLinus Torvalds goto done; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds if (strlen(name) > 31) 2741da177e4SLinus Torvalds goto fail; 2751da177e4SLinus Torvalds strcpy(s, name); 2761da177e4SLinus Torvalds for (p = s; *p; p++) 2771da177e4SLinus Torvalds if (*p == '/') 2781da177e4SLinus Torvalds *p = '!'; 27930f2f0ebSKay Sievers res = blk_lookup_devt(s, 0); 28030f2f0ebSKay Sievers if (res) 28130f2f0ebSKay Sievers goto done; 28230f2f0ebSKay Sievers 28330f2f0ebSKay Sievers /* 28425985edcSLucas De Marchi * try non-existent, but valid partition, which may only exist 28530f2f0ebSKay Sievers * after revalidating the disk, like partitioned md devices 28630f2f0ebSKay Sievers */ 28730f2f0ebSKay Sievers while (p > s && isdigit(p[-1])) 28830f2f0ebSKay Sievers p--; 28930f2f0ebSKay Sievers if (p == s || !*p || *p == '0') 29030f2f0ebSKay Sievers goto fail; 29130f2f0ebSKay Sievers 29230f2f0ebSKay Sievers /* try disk name without <part number> */ 29330f2f0ebSKay Sievers part = simple_strtoul(p, NULL, 10); 29430f2f0ebSKay Sievers *p = '\0'; 29530f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 29630f2f0ebSKay Sievers if (res) 29730f2f0ebSKay Sievers goto done; 29830f2f0ebSKay Sievers 29930f2f0ebSKay Sievers /* try disk name without p<part number> */ 30030f2f0ebSKay Sievers if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') 30130f2f0ebSKay Sievers goto fail; 30230f2f0ebSKay Sievers p[-1] = '\0'; 30330f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 3041da177e4SLinus Torvalds if (res) 3051da177e4SLinus Torvalds goto done; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds fail: 308edfaa7c3SKay Sievers return 0; 309edfaa7c3SKay Sievers done: 310edfaa7c3SKay Sievers return res; 3111da177e4SLinus Torvalds } 312e6e20a7aSDan Ehrenberg EXPORT_SYMBOL_GPL(name_to_dev_t); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds static int __init root_dev_setup(char *line) 3151da177e4SLinus Torvalds { 3161da177e4SLinus Torvalds strlcpy(saved_root_name, line, sizeof(saved_root_name)); 3171da177e4SLinus Torvalds return 1; 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds __setup("root=", root_dev_setup); 3211da177e4SLinus Torvalds 322cc1ed754SPierre Ossman static int __init rootwait_setup(char *str) 323cc1ed754SPierre Ossman { 324cc1ed754SPierre Ossman if (*str) 325cc1ed754SPierre Ossman return 0; 326cc1ed754SPierre Ossman root_wait = 1; 327cc1ed754SPierre Ossman return 1; 328cc1ed754SPierre Ossman } 329cc1ed754SPierre Ossman 330cc1ed754SPierre Ossman __setup("rootwait", rootwait_setup); 331cc1ed754SPierre Ossman 3321da177e4SLinus Torvalds static char * __initdata root_mount_data; 3331da177e4SLinus Torvalds static int __init root_data_setup(char *str) 3341da177e4SLinus Torvalds { 3351da177e4SLinus Torvalds root_mount_data = str; 3361da177e4SLinus Torvalds return 1; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds static char * __initdata root_fs_names; 3401da177e4SLinus Torvalds static int __init fs_names_setup(char *str) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds root_fs_names = str; 3431da177e4SLinus Torvalds return 1; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds static unsigned int __initdata root_delay; 3471da177e4SLinus Torvalds static int __init root_delay_setup(char *str) 3481da177e4SLinus Torvalds { 3491da177e4SLinus Torvalds root_delay = simple_strtoul(str, NULL, 0); 3501da177e4SLinus Torvalds return 1; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds __setup("rootflags=", root_data_setup); 3541da177e4SLinus Torvalds __setup("rootfstype=", fs_names_setup); 3551da177e4SLinus Torvalds __setup("rootdelay=", root_delay_setup); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds static void __init get_fs_names(char *page) 3581da177e4SLinus Torvalds { 3591da177e4SLinus Torvalds char *s = page; 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds if (root_fs_names) { 3621da177e4SLinus Torvalds strcpy(page, root_fs_names); 3631da177e4SLinus Torvalds while (*s++) { 3641da177e4SLinus Torvalds if (s[-1] == ',') 3651da177e4SLinus Torvalds s[-1] = '\0'; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds } else { 3681da177e4SLinus Torvalds int len = get_filesystem_list(page); 3691da177e4SLinus Torvalds char *p, *next; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds page[len] = '\0'; 3721da177e4SLinus Torvalds for (p = page-1; p; p = next) { 3731da177e4SLinus Torvalds next = strchr(++p, '\n'); 3741da177e4SLinus Torvalds if (*p++ != '\t') 3751da177e4SLinus Torvalds continue; 3761da177e4SLinus Torvalds while ((*s++ = *p++) != '\n') 3771da177e4SLinus Torvalds ; 3781da177e4SLinus Torvalds s[-1] = '\0'; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds *s = '\0'; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds static int __init do_mount_root(char *name, char *fs, int flags, void *data) 3851da177e4SLinus Torvalds { 386d8c9584eSAl Viro struct super_block *s; 387312db1aaSDominik Brodowski int err = ksys_mount(name, "/root", fs, flags, data); 3881da177e4SLinus Torvalds if (err) 3891da177e4SLinus Torvalds return err; 3901da177e4SLinus Torvalds 391447016e9SDominik Brodowski ksys_chdir("/root"); 392d8c9584eSAl Viro s = current->fs->pwd.dentry->d_sb; 393d8c9584eSAl Viro ROOT_DEV = s->s_dev; 39480cdc6daSMandeep Singh Baines printk(KERN_INFO 39580cdc6daSMandeep Singh Baines "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", 396d8c9584eSAl Viro s->s_type->name, 397bc98a42cSDavid Howells sb_rdonly(s) ? " readonly" : "", 398d8c9584eSAl Viro MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); 3991da177e4SLinus Torvalds return 0; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds void __init mount_block_root(char *name, int flags) 4031da177e4SLinus Torvalds { 40475f296d9SLevin, Alexander (Sasha Levin) struct page *page = alloc_page(GFP_KERNEL); 405a608ca21SJeff Layton char *fs_names = page_address(page); 4061da177e4SLinus Torvalds char *p; 4079361401eSDavid Howells #ifdef CONFIG_BLOCK 4081da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 4099361401eSDavid Howells #else 4109361401eSDavid Howells const char *b = name; 4119361401eSDavid Howells #endif 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds get_fs_names(fs_names); 4141da177e4SLinus Torvalds retry: 4151da177e4SLinus Torvalds for (p = fs_names; *p; p += strlen(p)+1) { 4161da177e4SLinus Torvalds int err = do_mount_root(name, p, flags, root_mount_data); 4171da177e4SLinus Torvalds switch (err) { 4181da177e4SLinus Torvalds case 0: 4191da177e4SLinus Torvalds goto out; 4201da177e4SLinus Torvalds case -EACCES: 4211da177e4SLinus Torvalds case -EINVAL: 4221da177e4SLinus Torvalds continue; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds /* 4251da177e4SLinus Torvalds * Allow the user to distinguish between failed sys_open 4261da177e4SLinus Torvalds * and bad superblock on root device. 427dd2a345fSDave Gilbert * and give them a list of the available devices 4281da177e4SLinus Torvalds */ 4299361401eSDavid Howells #ifdef CONFIG_BLOCK 4301da177e4SLinus Torvalds __bdevname(ROOT_DEV, b); 4319361401eSDavid Howells #endif 4320e0cb892SBernhard Walle printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", 4330e0cb892SBernhard Walle root_device_name, b, err); 434dd2a345fSDave Gilbert printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 4351da177e4SLinus Torvalds 436dd2a345fSDave Gilbert printk_all_partitions(); 43755dc7db7STejun Heo #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT 43855dc7db7STejun Heo printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " 43955dc7db7STejun Heo "explicit textual name for \"root=\" boot option.\n"); 44055dc7db7STejun Heo #endif 4411da177e4SLinus Torvalds panic("VFS: Unable to mount root fs on %s", b); 4421da177e4SLinus Torvalds } 443e462ec50SDavid Howells if (!(flags & SB_RDONLY)) { 444e462ec50SDavid Howells flags |= SB_RDONLY; 44510975933SMiklos Szeredi goto retry; 44610975933SMiklos Szeredi } 447be6e028bSAndy Whitcroft 448dd2a345fSDave Gilbert printk("List of all partitions:\n"); 449dd2a345fSDave Gilbert printk_all_partitions(); 450be6e028bSAndy Whitcroft printk("No filesystem could mount root, tried: "); 451be6e028bSAndy Whitcroft for (p = fs_names; *p; p += strlen(p)+1) 452be6e028bSAndy Whitcroft printk(" %s", p); 453be6e028bSAndy Whitcroft printk("\n"); 4549361401eSDavid Howells #ifdef CONFIG_BLOCK 4559361401eSDavid Howells __bdevname(ROOT_DEV, b); 4569361401eSDavid Howells #endif 4579361401eSDavid Howells panic("VFS: Unable to mount root fs on %s", b); 4581da177e4SLinus Torvalds out: 459a608ca21SJeff Layton put_page(page); 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 46343717c7dSChuck Lever 46443717c7dSChuck Lever #define NFSROOT_TIMEOUT_MIN 5 46543717c7dSChuck Lever #define NFSROOT_TIMEOUT_MAX 30 46643717c7dSChuck Lever #define NFSROOT_RETRY_MAX 5 46743717c7dSChuck Lever 4681da177e4SLinus Torvalds static int __init mount_nfs_root(void) 4691da177e4SLinus Torvalds { 47056463e50SChuck Lever char *root_dev, *root_data; 47143717c7dSChuck Lever unsigned int timeout; 47243717c7dSChuck Lever int try, err; 4731da177e4SLinus Torvalds 47443717c7dSChuck Lever err = nfs_root_data(&root_dev, &root_data); 47543717c7dSChuck Lever if (err != 0) 4761da177e4SLinus Torvalds return 0; 47743717c7dSChuck Lever 47843717c7dSChuck Lever /* 47943717c7dSChuck Lever * The server or network may not be ready, so try several 48043717c7dSChuck Lever * times. Stop after a few tries in case the client wants 48143717c7dSChuck Lever * to fall back to other boot methods. 48243717c7dSChuck Lever */ 48343717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MIN; 48443717c7dSChuck Lever for (try = 1; ; try++) { 48543717c7dSChuck Lever err = do_mount_root(root_dev, "nfs", 48643717c7dSChuck Lever root_mountflags, root_data); 48743717c7dSChuck Lever if (err == 0) 48856463e50SChuck Lever return 1; 48943717c7dSChuck Lever if (try > NFSROOT_RETRY_MAX) 49043717c7dSChuck Lever break; 49143717c7dSChuck Lever 49243717c7dSChuck Lever /* Wait, in case the server refused us immediately */ 49343717c7dSChuck Lever ssleep(timeout); 49443717c7dSChuck Lever timeout <<= 1; 49543717c7dSChuck Lever if (timeout > NFSROOT_TIMEOUT_MAX) 49643717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MAX; 49743717c7dSChuck Lever } 49843717c7dSChuck Lever return 0; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds #endif 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 5031da177e4SLinus Torvalds void __init change_floppy(char *fmt, ...) 5041da177e4SLinus Torvalds { 5051da177e4SLinus Torvalds struct termios termios; 5061da177e4SLinus Torvalds char buf[80]; 5071da177e4SLinus Torvalds char c; 5081da177e4SLinus Torvalds int fd; 5091da177e4SLinus Torvalds va_list args; 5101da177e4SLinus Torvalds va_start(args, fmt); 5111da177e4SLinus Torvalds vsprintf(buf, fmt, args); 5121da177e4SLinus Torvalds va_end(args); 513bae217eaSDominik Brodowski fd = ksys_open("/dev/root", O_RDWR | O_NDELAY, 0); 5141da177e4SLinus Torvalds if (fd >= 0) { 515cbb60b92SDominik Brodowski ksys_ioctl(fd, FDEJECT, 0); 5162ca2a09dSDominik Brodowski ksys_close(fd); 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 519bae217eaSDominik Brodowski fd = ksys_open("/dev/console", O_RDWR, 0); 5201da177e4SLinus Torvalds if (fd >= 0) { 521cbb60b92SDominik Brodowski ksys_ioctl(fd, TCGETS, (long)&termios); 5221da177e4SLinus Torvalds termios.c_lflag &= ~ICANON; 523cbb60b92SDominik Brodowski ksys_ioctl(fd, TCSETSF, (long)&termios); 5243ce4a7bfSDominik Brodowski ksys_read(fd, &c, 1); 5251da177e4SLinus Torvalds termios.c_lflag |= ICANON; 526cbb60b92SDominik Brodowski ksys_ioctl(fd, TCSETSF, (long)&termios); 5272ca2a09dSDominik Brodowski ksys_close(fd); 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds #endif 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds void __init mount_root(void) 5331da177e4SLinus Torvalds { 5341da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 535377485f6SSasha Levin if (ROOT_DEV == Root_NFS) { 5361da177e4SLinus Torvalds if (mount_nfs_root()) 5371da177e4SLinus Torvalds return; 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 5401da177e4SLinus Torvalds ROOT_DEV = Root_FD0; 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds #endif 5431da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_FD 5441da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 5451da177e4SLinus Torvalds /* rd_doload is 2 for a dual initrd/ramload setup */ 5461da177e4SLinus Torvalds if (rd_doload==2) { 5471da177e4SLinus Torvalds if (rd_load_disk(1)) { 5481da177e4SLinus Torvalds ROOT_DEV = Root_RAM1; 5491da177e4SLinus Torvalds root_device_name = NULL; 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds } else 5521da177e4SLinus Torvalds change_floppy("root floppy"); 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds #endif 5559361401eSDavid Howells #ifdef CONFIG_BLOCK 556c69e3c3aSVishnu Pratap Singh { 557c69e3c3aSVishnu Pratap Singh int err = create_dev("/dev/root", ROOT_DEV); 558c69e3c3aSVishnu Pratap Singh 559c69e3c3aSVishnu Pratap Singh if (err < 0) 560c69e3c3aSVishnu Pratap Singh pr_emerg("Failed to create /dev/root: %d\n", err); 5611da177e4SLinus Torvalds mount_block_root("/dev/root", root_mountflags); 562c69e3c3aSVishnu Pratap Singh } 5639361401eSDavid Howells #endif 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds /* 5671da177e4SLinus Torvalds * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 5681da177e4SLinus Torvalds */ 5691da177e4SLinus Torvalds void __init prepare_namespace(void) 5701da177e4SLinus Torvalds { 5711da177e4SLinus Torvalds int is_floppy; 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds if (root_delay) { 5741da177e4SLinus Torvalds printk(KERN_INFO "Waiting %d sec before mounting root device...\n", 5751da177e4SLinus Torvalds root_delay); 5761da177e4SLinus Torvalds ssleep(root_delay); 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 579216773a7SArjan van de Ven /* 580216773a7SArjan van de Ven * wait for the known devices to complete their probing 581216773a7SArjan van de Ven * 582216773a7SArjan van de Ven * Note: this is a potential source of long boot delays. 583216773a7SArjan van de Ven * For example, it is not atypical to wait 5 seconds here 584216773a7SArjan van de Ven * for the touchpad of a laptop to initialize. 585216773a7SArjan van de Ven */ 586216773a7SArjan van de Ven wait_for_device_probe(); 587d779249eSGreg Kroah-Hartman 5881da177e4SLinus Torvalds md_run_setup(); 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds if (saved_root_name[0]) { 5911da177e4SLinus Torvalds root_device_name = saved_root_name; 5922d62f488SAdrian Hunter if (!strncmp(root_device_name, "mtd", 3) || 5932d62f488SAdrian Hunter !strncmp(root_device_name, "ubi", 3)) { 594e9482b43SJoern Engel mount_block_root(root_device_name, root_mountflags); 595e9482b43SJoern Engel goto out; 596e9482b43SJoern Engel } 5971da177e4SLinus Torvalds ROOT_DEV = name_to_dev_t(root_device_name); 5981da177e4SLinus Torvalds if (strncmp(root_device_name, "/dev/", 5) == 0) 5991da177e4SLinus Torvalds root_device_name += 5; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds if (initrd_load()) 6031da177e4SLinus Torvalds goto out; 6041da177e4SLinus Torvalds 605cc1ed754SPierre Ossman /* wait for any asynchronous scanning to complete */ 606cc1ed754SPierre Ossman if ((ROOT_DEV == 0) && root_wait) { 607cc1ed754SPierre Ossman printk(KERN_INFO "Waiting for root device %s...\n", 608cc1ed754SPierre Ossman saved_root_name); 609cc1ed754SPierre Ossman while (driver_probe_done() != 0 || 610cc1ed754SPierre Ossman (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 61139a0e975SJungseung Lee msleep(5); 612216773a7SArjan van de Ven async_synchronize_full(); 613cc1ed754SPierre Ossman } 614cc1ed754SPierre Ossman 615cc1ed754SPierre Ossman is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 616cc1ed754SPierre Ossman 6171da177e4SLinus Torvalds if (is_floppy && rd_doload && rd_load_disk(0)) 6181da177e4SLinus Torvalds ROOT_DEV = Root_RAM0; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds mount_root(); 6211da177e4SLinus Torvalds out: 6222b2af54aSKay Sievers devtmpfs_mount("dev"); 623312db1aaSDominik Brodowski ksys_mount(".", "/", NULL, MS_MOVE, NULL); 624a16fe33aSDominik Brodowski ksys_chroot("."); 6251da177e4SLinus Torvalds } 62657f150a5SRob Landley 6276e19ededSRob Landley static bool is_tmpfs; 62857f150a5SRob Landley static struct dentry *rootfs_mount(struct file_system_type *fs_type, 62957f150a5SRob Landley int flags, const char *dev_name, void *data) 63057f150a5SRob Landley { 63157f150a5SRob Landley static unsigned long once; 6326e19ededSRob Landley void *fill = ramfs_fill_super; 63357f150a5SRob Landley 63457f150a5SRob Landley if (test_and_set_bit(0, &once)) 63557f150a5SRob Landley return ERR_PTR(-ENODEV); 63657f150a5SRob Landley 6376e19ededSRob Landley if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) 6386e19ededSRob Landley fill = shmem_fill_super; 6396e19ededSRob Landley 6406e19ededSRob Landley return mount_nodev(fs_type, flags, data, fill); 64157f150a5SRob Landley } 64257f150a5SRob Landley 64357f150a5SRob Landley static struct file_system_type rootfs_fs_type = { 64457f150a5SRob Landley .name = "rootfs", 64557f150a5SRob Landley .mount = rootfs_mount, 64657f150a5SRob Landley .kill_sb = kill_litter_super, 64757f150a5SRob Landley }; 64857f150a5SRob Landley 64957f150a5SRob Landley int __init init_rootfs(void) 65057f150a5SRob Landley { 65157f150a5SRob Landley int err = register_filesystem(&rootfs_fs_type); 65257f150a5SRob Landley 65357f150a5SRob Landley if (err) 65457f150a5SRob Landley return err; 65557f150a5SRob Landley 6566e19ededSRob Landley if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && 6576e19ededSRob Landley (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { 65816203a7aSRob Landley err = shmem_init(); 6596e19ededSRob Landley is_tmpfs = true; 6606e19ededSRob Landley } else { 66157f150a5SRob Landley err = init_ramfs_fs(); 6626e19ededSRob Landley } 66316203a7aSRob Landley 66457f150a5SRob Landley if (err) 66557f150a5SRob Landley unregister_filesystem(&rootfs_fs_type); 66657f150a5SRob Landley 66757f150a5SRob Landley return err; 66857f150a5SRob Landley } 669