1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds #include <linux/module.h> 31da177e4SLinus Torvalds #include <linux/sched.h> 41da177e4SLinus Torvalds #include <linux/ctype.h> 51da177e4SLinus Torvalds #include <linux/fd.h> 61da177e4SLinus Torvalds #include <linux/tty.h> 71da177e4SLinus Torvalds #include <linux/suspend.h> 81da177e4SLinus Torvalds #include <linux/root_dev.h> 91da177e4SLinus Torvalds #include <linux/security.h> 101da177e4SLinus Torvalds #include <linux/delay.h> 11dd2a345fSDave Gilbert #include <linux/genhd.h> 12d53d9f16SAndrew Morton #include <linux/mount.h> 13d779249eSGreg Kroah-Hartman #include <linux/device.h> 1446595390SAdrian Bunk #include <linux/init.h> 15011e3fcdSAdrian Bunk #include <linux/fs.h> 1682c8253aSAdrian Bunk #include <linux/initrd.h> 1722a9d645SArjan van de Ven #include <linux/async.h> 185ad4e53bSAl Viro #include <linux/fs_struct.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 2057f150a5SRob Landley #include <linux/ramfs.h> 2116203a7aSRob Landley #include <linux/shmem_fs.h> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include <linux/nfs_fs.h> 241da177e4SLinus Torvalds #include <linux/nfs_fs_sb.h> 251da177e4SLinus Torvalds #include <linux/nfs_mount.h> 26e262e32dSDavid Howells #include <uapi/linux/mount.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include "do_mounts.h" 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 311da177e4SLinus Torvalds 329b04c997STheodore Ts'o int root_mountflags = MS_RDONLY | MS_SILENT; 33f56f6d30SAdrian Bunk static char * __initdata root_device_name; 341da177e4SLinus Torvalds static char __initdata saved_root_name[64]; 3579975f13SWill Drewry static int root_wait; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds dev_t ROOT_DEV; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds static int __init load_ramdisk(char *str) 401da177e4SLinus Torvalds { 411da177e4SLinus Torvalds rd_doload = simple_strtol(str,NULL,0) & 3; 421da177e4SLinus Torvalds return 1; 431da177e4SLinus Torvalds } 441da177e4SLinus Torvalds __setup("load_ramdisk=", load_ramdisk); 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static int __init readonly(char *str) 471da177e4SLinus Torvalds { 481da177e4SLinus Torvalds if (*str) 491da177e4SLinus Torvalds return 0; 501da177e4SLinus Torvalds root_mountflags |= MS_RDONLY; 511da177e4SLinus Torvalds return 1; 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static int __init readwrite(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 __setup("ro", readonly); 631da177e4SLinus Torvalds __setup("rw", readwrite); 641da177e4SLinus Torvalds 656d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 661ad7e899SStephen Warren struct uuidcmp { 671ad7e899SStephen Warren const char *uuid; 681ad7e899SStephen Warren int len; 691ad7e899SStephen Warren }; 701ad7e899SStephen Warren 71b5af921eSWill Drewry /** 72b5af921eSWill Drewry * match_dev_by_uuid - callback for finding a partition using its uuid 73b5af921eSWill Drewry * @dev: device passed in by the caller 741ad7e899SStephen Warren * @data: opaque pointer to the desired struct uuidcmp to match 75b5af921eSWill Drewry * 76b5af921eSWill Drewry * Returns 1 if the device matches, and 0 otherwise. 77b5af921eSWill Drewry */ 789f3b795aSMichał Mirosław static int match_dev_by_uuid(struct device *dev, const void *data) 79b5af921eSWill Drewry { 809f3b795aSMichał Mirosław const struct uuidcmp *cmp = data; 81b5af921eSWill Drewry struct hd_struct *part = dev_to_part(dev); 82b5af921eSWill Drewry 83b5af921eSWill Drewry if (!part->info) 84b5af921eSWill Drewry goto no_match; 85b5af921eSWill Drewry 861ad7e899SStephen Warren if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) 87b5af921eSWill Drewry goto no_match; 88b5af921eSWill Drewry 89b5af921eSWill Drewry return 1; 90b5af921eSWill Drewry no_match: 91b5af921eSWill Drewry return 0; 92b5af921eSWill Drewry } 93b5af921eSWill Drewry 94b5af921eSWill Drewry 95b5af921eSWill Drewry /** 96b5af921eSWill Drewry * devt_from_partuuid - looks up the dev_t of a partition by its UUID 97a68b3108Schishanmingshen * @uuid_str: char array containing ascii UUID 98b5af921eSWill Drewry * 99b5af921eSWill Drewry * The function will return the first partition which contains a matching 100b5af921eSWill Drewry * UUID value in its partition_meta_info struct. This does not search 101b5af921eSWill Drewry * by filesystem UUIDs. 102b5af921eSWill Drewry * 103a68b3108Schishanmingshen * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be 10479975f13SWill Drewry * extracted and used as an offset from the partition identified by the UUID. 10579975f13SWill Drewry * 106b5af921eSWill Drewry * Returns the matching dev_t on success or 0 on failure. 107b5af921eSWill Drewry */ 1081ad7e899SStephen Warren static dev_t devt_from_partuuid(const char *uuid_str) 109b5af921eSWill Drewry { 110b5af921eSWill Drewry dev_t res = 0; 1111ad7e899SStephen Warren struct uuidcmp cmp; 112b5af921eSWill Drewry struct device *dev = NULL; 11379975f13SWill Drewry struct gendisk *disk; 11479975f13SWill Drewry struct hd_struct *part; 11579975f13SWill Drewry int offset = 0; 116283f8fc0SStephen Warren bool clear_root_wait = false; 117283f8fc0SStephen Warren char *slash; 11879975f13SWill Drewry 1191ad7e899SStephen Warren cmp.uuid = uuid_str; 1201ad7e899SStephen Warren 121283f8fc0SStephen Warren slash = strchr(uuid_str, '/'); 12279975f13SWill Drewry /* Check for optional partition number offset attributes. */ 123283f8fc0SStephen Warren if (slash) { 12479975f13SWill Drewry char c = 0; 12579975f13SWill Drewry /* Explicitly fail on poor PARTUUID syntax. */ 126283f8fc0SStephen Warren if (sscanf(slash + 1, 127283f8fc0SStephen Warren "PARTNROFF=%d%c", &offset, &c) != 1) { 128283f8fc0SStephen Warren clear_root_wait = true; 12979975f13SWill Drewry goto done; 13079975f13SWill Drewry } 131283f8fc0SStephen Warren cmp.len = slash - uuid_str; 132283f8fc0SStephen Warren } else { 133283f8fc0SStephen Warren cmp.len = strlen(uuid_str); 134283f8fc0SStephen Warren } 135283f8fc0SStephen Warren 136283f8fc0SStephen Warren if (!cmp.len) { 137283f8fc0SStephen Warren clear_root_wait = true; 138283f8fc0SStephen Warren goto done; 13979975f13SWill Drewry } 140b5af921eSWill Drewry 1411ad7e899SStephen Warren dev = class_find_device(&block_class, NULL, &cmp, 1421ad7e899SStephen Warren &match_dev_by_uuid); 143b5af921eSWill Drewry if (!dev) 144b5af921eSWill Drewry goto done; 145b5af921eSWill Drewry 146b5af921eSWill Drewry res = dev->devt; 147b5af921eSWill Drewry 14879975f13SWill Drewry /* Attempt to find the partition by offset. */ 14979975f13SWill Drewry if (!offset) 15079975f13SWill Drewry goto no_offset; 15179975f13SWill Drewry 15279975f13SWill Drewry res = 0; 15379975f13SWill Drewry disk = part_to_disk(dev_to_part(dev)); 15479975f13SWill Drewry part = disk_get_part(disk, dev_to_part(dev)->partno + offset); 15579975f13SWill Drewry if (part) { 15679975f13SWill Drewry res = part_devt(part); 15779975f13SWill Drewry put_device(part_to_dev(part)); 15879975f13SWill Drewry } 15979975f13SWill Drewry 16079975f13SWill Drewry no_offset: 16179975f13SWill Drewry put_device(dev); 162b5af921eSWill Drewry done: 163283f8fc0SStephen Warren if (clear_root_wait) { 164283f8fc0SStephen Warren pr_err("VFS: PARTUUID= is invalid.\n" 165283f8fc0SStephen Warren "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); 166283f8fc0SStephen Warren if (root_wait) 167283f8fc0SStephen Warren pr_err("Disabling rootwait; root= is invalid.\n"); 168283f8fc0SStephen Warren root_wait = 0; 169283f8fc0SStephen Warren } 170b5af921eSWill Drewry return res; 171b5af921eSWill Drewry } 172f027c34dSNikolaus Voss 173f027c34dSNikolaus Voss /** 174f027c34dSNikolaus Voss * match_dev_by_label - callback for finding a partition using its label 175f027c34dSNikolaus Voss * @dev: device passed in by the caller 176f027c34dSNikolaus Voss * @data: opaque pointer to the label to match 177f027c34dSNikolaus Voss * 178f027c34dSNikolaus Voss * Returns 1 if the device matches, and 0 otherwise. 179f027c34dSNikolaus Voss */ 180f027c34dSNikolaus Voss static int match_dev_by_label(struct device *dev, const void *data) 181f027c34dSNikolaus Voss { 182f027c34dSNikolaus Voss const char *label = data; 183f027c34dSNikolaus Voss struct hd_struct *part = dev_to_part(dev); 184f027c34dSNikolaus Voss 185f027c34dSNikolaus Voss if (part->info && !strcmp(label, part->info->volname)) 186f027c34dSNikolaus Voss return 1; 187f027c34dSNikolaus Voss 188f027c34dSNikolaus Voss return 0; 189f027c34dSNikolaus Voss } 1906d0aed7aSJens Axboe #endif 191b5af921eSWill Drewry 1921da177e4SLinus Torvalds /* 1931da177e4SLinus Torvalds * Convert a name into device number. We accept the following variants: 1941da177e4SLinus Torvalds * 1950bf37ae4SPavel Machek * 1) <hex_major><hex_minor> device number in hexadecimal represents itself 1960bf37ae4SPavel Machek * no leading 0x, for example b302. 1971da177e4SLinus Torvalds * 2) /dev/nfs represents Root_NFS (0xff) 1981da177e4SLinus Torvalds * 3) /dev/<disk_name> represents the device number of disk 1991da177e4SLinus Torvalds * 4) /dev/<disk_name><decimal> represents the device number 2001da177e4SLinus Torvalds * of partition - device number of disk plus the partition number 2011da177e4SLinus Torvalds * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 2021da177e4SLinus Torvalds * used when disk name of partitioned disk ends on a digit. 203b5af921eSWill Drewry * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 204b5af921eSWill Drewry * unique id of a partition if the partition table provides it. 205d33b98fcSStephen Warren * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS 206d33b98fcSStephen Warren * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- 207d33b98fcSStephen Warren * filled hex representation of the 32-bit "NT disk signature", and PP 208d33b98fcSStephen Warren * is a zero-filled hex representation of the 1-based partition number. 20979975f13SWill Drewry * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to 21079975f13SWill Drewry * a partition with a known unique id. 2116c251611SSebastian Capella * 8) <major>:<minor> major and minor number of the device separated by 2126c251611SSebastian Capella * a colon. 213f027c34dSNikolaus Voss * 9) PARTLABEL=<name> with name being the GPT partition label. 214f027c34dSNikolaus Voss * MSDOS partitions do not support labels! 2158902dd52SPaulo Alcantara (SUSE) * 10) /dev/cifs represents Root_CIFS (0xfe) 2161da177e4SLinus Torvalds * 217edfaa7c3SKay Sievers * If name doesn't have fall into the categories above, we return (0,0). 218edfaa7c3SKay Sievers * block_class is used to check if something is a disk name. If the disk 219edfaa7c3SKay Sievers * name contains slashes, the device name has them replaced with 220edfaa7c3SKay Sievers * bangs. 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds 223e6e20a7aSDan Ehrenberg dev_t name_to_dev_t(const char *name) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds char s[32]; 2261da177e4SLinus Torvalds char *p; 2271da177e4SLinus Torvalds dev_t res = 0; 22830f2f0ebSKay Sievers int part; 2291da177e4SLinus Torvalds 2306d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 231b5af921eSWill Drewry if (strncmp(name, "PARTUUID=", 9) == 0) { 232b5af921eSWill Drewry name += 9; 233b5af921eSWill Drewry res = devt_from_partuuid(name); 234b5af921eSWill Drewry if (!res) 235b5af921eSWill Drewry goto fail; 236b5af921eSWill Drewry goto done; 237f027c34dSNikolaus Voss } else if (strncmp(name, "PARTLABEL=", 10) == 0) { 238f027c34dSNikolaus Voss struct device *dev; 239f027c34dSNikolaus Voss 240f027c34dSNikolaus Voss dev = class_find_device(&block_class, NULL, name + 10, 241f027c34dSNikolaus Voss &match_dev_by_label); 242f027c34dSNikolaus Voss if (!dev) 243f027c34dSNikolaus Voss goto fail; 244f027c34dSNikolaus Voss 245f027c34dSNikolaus Voss res = dev->devt; 246f027c34dSNikolaus Voss put_device(dev); 247f027c34dSNikolaus Voss goto done; 248b5af921eSWill Drewry } 2496d0aed7aSJens Axboe #endif 250b5af921eSWill Drewry 2511da177e4SLinus Torvalds if (strncmp(name, "/dev/", 5) != 0) { 252cb31ef48SChen Yu unsigned maj, min, offset; 253283e7ad0SDan Ehrenberg char dummy; 2541da177e4SLinus Torvalds 255cb31ef48SChen Yu if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) || 256cb31ef48SChen Yu (sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) { 2571da177e4SLinus Torvalds res = MKDEV(maj, min); 2581da177e4SLinus Torvalds if (maj != MAJOR(res) || min != MINOR(res)) 2591da177e4SLinus Torvalds goto fail; 2601da177e4SLinus Torvalds } else { 2611da177e4SLinus Torvalds res = new_decode_dev(simple_strtoul(name, &p, 16)); 2621da177e4SLinus Torvalds if (*p) 2631da177e4SLinus Torvalds goto fail; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds goto done; 2661da177e4SLinus Torvalds } 267edfaa7c3SKay Sievers 2681da177e4SLinus Torvalds name += 5; 2691da177e4SLinus Torvalds res = Root_NFS; 2701da177e4SLinus Torvalds if (strcmp(name, "nfs") == 0) 2711da177e4SLinus Torvalds goto done; 2728902dd52SPaulo Alcantara (SUSE) res = Root_CIFS; 2738902dd52SPaulo Alcantara (SUSE) if (strcmp(name, "cifs") == 0) 2748902dd52SPaulo Alcantara (SUSE) goto done; 2751da177e4SLinus Torvalds res = Root_RAM0; 2761da177e4SLinus Torvalds if (strcmp(name, "ram") == 0) 2771da177e4SLinus Torvalds goto done; 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds if (strlen(name) > 31) 2801da177e4SLinus Torvalds goto fail; 2811da177e4SLinus Torvalds strcpy(s, name); 2821da177e4SLinus Torvalds for (p = s; *p; p++) 2831da177e4SLinus Torvalds if (*p == '/') 2841da177e4SLinus Torvalds *p = '!'; 28530f2f0ebSKay Sievers res = blk_lookup_devt(s, 0); 28630f2f0ebSKay Sievers if (res) 28730f2f0ebSKay Sievers goto done; 28830f2f0ebSKay Sievers 28930f2f0ebSKay Sievers /* 29025985edcSLucas De Marchi * try non-existent, but valid partition, which may only exist 29130f2f0ebSKay Sievers * after revalidating the disk, like partitioned md devices 29230f2f0ebSKay Sievers */ 29330f2f0ebSKay Sievers while (p > s && isdigit(p[-1])) 29430f2f0ebSKay Sievers p--; 29530f2f0ebSKay Sievers if (p == s || !*p || *p == '0') 29630f2f0ebSKay Sievers goto fail; 29730f2f0ebSKay Sievers 29830f2f0ebSKay Sievers /* try disk name without <part number> */ 29930f2f0ebSKay Sievers part = simple_strtoul(p, NULL, 10); 30030f2f0ebSKay Sievers *p = '\0'; 30130f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 30230f2f0ebSKay Sievers if (res) 30330f2f0ebSKay Sievers goto done; 30430f2f0ebSKay Sievers 30530f2f0ebSKay Sievers /* try disk name without p<part number> */ 30630f2f0ebSKay Sievers if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') 30730f2f0ebSKay Sievers goto fail; 30830f2f0ebSKay Sievers p[-1] = '\0'; 30930f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 3101da177e4SLinus Torvalds if (res) 3111da177e4SLinus Torvalds goto done; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds fail: 314edfaa7c3SKay Sievers return 0; 315edfaa7c3SKay Sievers done: 316edfaa7c3SKay Sievers return res; 3171da177e4SLinus Torvalds } 318e6e20a7aSDan Ehrenberg EXPORT_SYMBOL_GPL(name_to_dev_t); 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds static int __init root_dev_setup(char *line) 3211da177e4SLinus Torvalds { 3221da177e4SLinus Torvalds strlcpy(saved_root_name, line, sizeof(saved_root_name)); 3231da177e4SLinus Torvalds return 1; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds __setup("root=", root_dev_setup); 3271da177e4SLinus Torvalds 328cc1ed754SPierre Ossman static int __init rootwait_setup(char *str) 329cc1ed754SPierre Ossman { 330cc1ed754SPierre Ossman if (*str) 331cc1ed754SPierre Ossman return 0; 332cc1ed754SPierre Ossman root_wait = 1; 333cc1ed754SPierre Ossman return 1; 334cc1ed754SPierre Ossman } 335cc1ed754SPierre Ossman 336cc1ed754SPierre Ossman __setup("rootwait", rootwait_setup); 337cc1ed754SPierre Ossman 3381da177e4SLinus Torvalds static char * __initdata root_mount_data; 3391da177e4SLinus Torvalds static int __init root_data_setup(char *str) 3401da177e4SLinus Torvalds { 3411da177e4SLinus Torvalds root_mount_data = str; 3421da177e4SLinus Torvalds return 1; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds static char * __initdata root_fs_names; 3461da177e4SLinus Torvalds static int __init fs_names_setup(char *str) 3471da177e4SLinus Torvalds { 3481da177e4SLinus Torvalds root_fs_names = str; 3491da177e4SLinus Torvalds return 1; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds static unsigned int __initdata root_delay; 3531da177e4SLinus Torvalds static int __init root_delay_setup(char *str) 3541da177e4SLinus Torvalds { 3551da177e4SLinus Torvalds root_delay = simple_strtoul(str, NULL, 0); 3561da177e4SLinus Torvalds return 1; 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds __setup("rootflags=", root_data_setup); 3601da177e4SLinus Torvalds __setup("rootfstype=", fs_names_setup); 3611da177e4SLinus Torvalds __setup("rootdelay=", root_delay_setup); 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds static void __init get_fs_names(char *page) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds char *s = page; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds if (root_fs_names) { 3681da177e4SLinus Torvalds strcpy(page, root_fs_names); 3691da177e4SLinus Torvalds while (*s++) { 3701da177e4SLinus Torvalds if (s[-1] == ',') 3711da177e4SLinus Torvalds s[-1] = '\0'; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds } else { 3741da177e4SLinus Torvalds int len = get_filesystem_list(page); 3751da177e4SLinus Torvalds char *p, *next; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds page[len] = '\0'; 3781da177e4SLinus Torvalds for (p = page-1; p; p = next) { 3791da177e4SLinus Torvalds next = strchr(++p, '\n'); 3801da177e4SLinus Torvalds if (*p++ != '\t') 3811da177e4SLinus Torvalds continue; 3821da177e4SLinus Torvalds while ((*s++ = *p++) != '\n') 3831da177e4SLinus Torvalds ; 3841da177e4SLinus Torvalds s[-1] = '\0'; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds *s = '\0'; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 390cccaa5e3SDominik Brodowski static int __init do_mount_root(const char *name, const char *fs, 391cccaa5e3SDominik Brodowski const int flags, const void *data) 3921da177e4SLinus Torvalds { 393d8c9584eSAl Viro struct super_block *s; 394cccaa5e3SDominik Brodowski char *data_page; 395cccaa5e3SDominik Brodowski struct page *p; 396cccaa5e3SDominik Brodowski int ret; 397cccaa5e3SDominik Brodowski 398cccaa5e3SDominik Brodowski /* do_mount() requires a full page as fifth argument */ 399cccaa5e3SDominik Brodowski p = alloc_page(GFP_KERNEL); 400cccaa5e3SDominik Brodowski if (!p) 401cccaa5e3SDominik Brodowski return -ENOMEM; 402cccaa5e3SDominik Brodowski 403cccaa5e3SDominik Brodowski data_page = page_address(p); 404cccaa5e3SDominik Brodowski strncpy(data_page, data, PAGE_SIZE - 1); 405cccaa5e3SDominik Brodowski 406cccaa5e3SDominik Brodowski ret = do_mount(name, "/root", fs, flags, data_page); 407cccaa5e3SDominik Brodowski if (ret) 408cccaa5e3SDominik Brodowski goto out; 4091da177e4SLinus Torvalds 410447016e9SDominik Brodowski ksys_chdir("/root"); 411d8c9584eSAl Viro s = current->fs->pwd.dentry->d_sb; 412d8c9584eSAl Viro ROOT_DEV = s->s_dev; 41380cdc6daSMandeep Singh Baines printk(KERN_INFO 41480cdc6daSMandeep Singh Baines "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", 415d8c9584eSAl Viro s->s_type->name, 416bc98a42cSDavid Howells sb_rdonly(s) ? " readonly" : "", 417d8c9584eSAl Viro MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); 418cccaa5e3SDominik Brodowski 419cccaa5e3SDominik Brodowski out: 420cccaa5e3SDominik Brodowski put_page(p); 421cccaa5e3SDominik Brodowski return ret; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds void __init mount_block_root(char *name, int flags) 4251da177e4SLinus Torvalds { 42675f296d9SLevin, Alexander (Sasha Levin) struct page *page = alloc_page(GFP_KERNEL); 427a608ca21SJeff Layton char *fs_names = page_address(page); 4281da177e4SLinus Torvalds char *p; 4299361401eSDavid Howells #ifdef CONFIG_BLOCK 4301da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 4319361401eSDavid Howells #else 4329361401eSDavid Howells const char *b = name; 4339361401eSDavid Howells #endif 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds get_fs_names(fs_names); 4361da177e4SLinus Torvalds retry: 4371da177e4SLinus Torvalds for (p = fs_names; *p; p += strlen(p)+1) { 4381da177e4SLinus Torvalds int err = do_mount_root(name, p, flags, root_mount_data); 4391da177e4SLinus Torvalds switch (err) { 4401da177e4SLinus Torvalds case 0: 4411da177e4SLinus Torvalds goto out; 4421da177e4SLinus Torvalds case -EACCES: 4431da177e4SLinus Torvalds case -EINVAL: 4441da177e4SLinus Torvalds continue; 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds /* 4471da177e4SLinus Torvalds * Allow the user to distinguish between failed sys_open 4481da177e4SLinus Torvalds * and bad superblock on root device. 449dd2a345fSDave Gilbert * and give them a list of the available devices 4501da177e4SLinus Torvalds */ 4519361401eSDavid Howells #ifdef CONFIG_BLOCK 4521da177e4SLinus Torvalds __bdevname(ROOT_DEV, b); 4539361401eSDavid Howells #endif 4540e0cb892SBernhard Walle printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", 4550e0cb892SBernhard Walle root_device_name, b, err); 456dd2a345fSDave Gilbert printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 4571da177e4SLinus Torvalds 458dd2a345fSDave Gilbert printk_all_partitions(); 45955dc7db7STejun Heo #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT 46055dc7db7STejun Heo printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " 46155dc7db7STejun Heo "explicit textual name for \"root=\" boot option.\n"); 46255dc7db7STejun Heo #endif 4631da177e4SLinus Torvalds panic("VFS: Unable to mount root fs on %s", b); 4641da177e4SLinus Torvalds } 465e462ec50SDavid Howells if (!(flags & SB_RDONLY)) { 466e462ec50SDavid Howells flags |= SB_RDONLY; 46710975933SMiklos Szeredi goto retry; 46810975933SMiklos Szeredi } 469be6e028bSAndy Whitcroft 470dd2a345fSDave Gilbert printk("List of all partitions:\n"); 471dd2a345fSDave Gilbert printk_all_partitions(); 472be6e028bSAndy Whitcroft printk("No filesystem could mount root, tried: "); 473be6e028bSAndy Whitcroft for (p = fs_names; *p; p += strlen(p)+1) 474be6e028bSAndy Whitcroft printk(" %s", p); 475be6e028bSAndy Whitcroft printk("\n"); 4769361401eSDavid Howells #ifdef CONFIG_BLOCK 4779361401eSDavid Howells __bdevname(ROOT_DEV, b); 4789361401eSDavid Howells #endif 4799361401eSDavid Howells panic("VFS: Unable to mount root fs on %s", b); 4801da177e4SLinus Torvalds out: 481a608ca21SJeff Layton put_page(page); 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 48543717c7dSChuck Lever 48643717c7dSChuck Lever #define NFSROOT_TIMEOUT_MIN 5 48743717c7dSChuck Lever #define NFSROOT_TIMEOUT_MAX 30 48843717c7dSChuck Lever #define NFSROOT_RETRY_MAX 5 48943717c7dSChuck Lever 4901da177e4SLinus Torvalds static int __init mount_nfs_root(void) 4911da177e4SLinus Torvalds { 49256463e50SChuck Lever char *root_dev, *root_data; 49343717c7dSChuck Lever unsigned int timeout; 49443717c7dSChuck Lever int try, err; 4951da177e4SLinus Torvalds 49643717c7dSChuck Lever err = nfs_root_data(&root_dev, &root_data); 49743717c7dSChuck Lever if (err != 0) 4981da177e4SLinus Torvalds return 0; 49943717c7dSChuck Lever 50043717c7dSChuck Lever /* 50143717c7dSChuck Lever * The server or network may not be ready, so try several 50243717c7dSChuck Lever * times. Stop after a few tries in case the client wants 50343717c7dSChuck Lever * to fall back to other boot methods. 50443717c7dSChuck Lever */ 50543717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MIN; 50643717c7dSChuck Lever for (try = 1; ; try++) { 50743717c7dSChuck Lever err = do_mount_root(root_dev, "nfs", 50843717c7dSChuck Lever root_mountflags, root_data); 50943717c7dSChuck Lever if (err == 0) 51056463e50SChuck Lever return 1; 51143717c7dSChuck Lever if (try > NFSROOT_RETRY_MAX) 51243717c7dSChuck Lever break; 51343717c7dSChuck Lever 51443717c7dSChuck Lever /* Wait, in case the server refused us immediately */ 51543717c7dSChuck Lever ssleep(timeout); 51643717c7dSChuck Lever timeout <<= 1; 51743717c7dSChuck Lever if (timeout > NFSROOT_TIMEOUT_MAX) 51843717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MAX; 51943717c7dSChuck Lever } 52043717c7dSChuck Lever return 0; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds #endif 5231da177e4SLinus Torvalds 5248902dd52SPaulo Alcantara (SUSE) #ifdef CONFIG_CIFS_ROOT 5258902dd52SPaulo Alcantara (SUSE) 5268902dd52SPaulo Alcantara (SUSE) extern int cifs_root_data(char **dev, char **opts); 5278902dd52SPaulo Alcantara (SUSE) 5288902dd52SPaulo Alcantara (SUSE) #define CIFSROOT_TIMEOUT_MIN 5 5298902dd52SPaulo Alcantara (SUSE) #define CIFSROOT_TIMEOUT_MAX 30 5308902dd52SPaulo Alcantara (SUSE) #define CIFSROOT_RETRY_MAX 5 5318902dd52SPaulo Alcantara (SUSE) 5328902dd52SPaulo Alcantara (SUSE) static int __init mount_cifs_root(void) 5338902dd52SPaulo Alcantara (SUSE) { 5348902dd52SPaulo Alcantara (SUSE) char *root_dev, *root_data; 5358902dd52SPaulo Alcantara (SUSE) unsigned int timeout; 5368902dd52SPaulo Alcantara (SUSE) int try, err; 5378902dd52SPaulo Alcantara (SUSE) 5388902dd52SPaulo Alcantara (SUSE) err = cifs_root_data(&root_dev, &root_data); 5398902dd52SPaulo Alcantara (SUSE) if (err != 0) 5408902dd52SPaulo Alcantara (SUSE) return 0; 5418902dd52SPaulo Alcantara (SUSE) 5428902dd52SPaulo Alcantara (SUSE) timeout = CIFSROOT_TIMEOUT_MIN; 5438902dd52SPaulo Alcantara (SUSE) for (try = 1; ; try++) { 5448902dd52SPaulo Alcantara (SUSE) err = do_mount_root(root_dev, "cifs", root_mountflags, 5458902dd52SPaulo Alcantara (SUSE) root_data); 5468902dd52SPaulo Alcantara (SUSE) if (err == 0) 5478902dd52SPaulo Alcantara (SUSE) return 1; 5488902dd52SPaulo Alcantara (SUSE) if (try > CIFSROOT_RETRY_MAX) 5498902dd52SPaulo Alcantara (SUSE) break; 5508902dd52SPaulo Alcantara (SUSE) 5518902dd52SPaulo Alcantara (SUSE) ssleep(timeout); 5528902dd52SPaulo Alcantara (SUSE) timeout <<= 1; 5538902dd52SPaulo Alcantara (SUSE) if (timeout > CIFSROOT_TIMEOUT_MAX) 5548902dd52SPaulo Alcantara (SUSE) timeout = CIFSROOT_TIMEOUT_MAX; 5558902dd52SPaulo Alcantara (SUSE) } 5568902dd52SPaulo Alcantara (SUSE) return 0; 5578902dd52SPaulo Alcantara (SUSE) } 5588902dd52SPaulo Alcantara (SUSE) #endif 5598902dd52SPaulo Alcantara (SUSE) 5601da177e4SLinus Torvalds #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 5611da177e4SLinus Torvalds void __init change_floppy(char *fmt, ...) 5621da177e4SLinus Torvalds { 5631da177e4SLinus Torvalds struct termios termios; 5641da177e4SLinus Torvalds char buf[80]; 5651da177e4SLinus Torvalds char c; 5661da177e4SLinus Torvalds int fd; 5671da177e4SLinus Torvalds va_list args; 5681da177e4SLinus Torvalds va_start(args, fmt); 5691da177e4SLinus Torvalds vsprintf(buf, fmt, args); 5701da177e4SLinus Torvalds va_end(args); 571bae217eaSDominik Brodowski fd = ksys_open("/dev/root", O_RDWR | O_NDELAY, 0); 5721da177e4SLinus Torvalds if (fd >= 0) { 573cbb60b92SDominik Brodowski ksys_ioctl(fd, FDEJECT, 0); 5742ca2a09dSDominik Brodowski ksys_close(fd); 5751da177e4SLinus Torvalds } 5761da177e4SLinus Torvalds printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 577bae217eaSDominik Brodowski fd = ksys_open("/dev/console", O_RDWR, 0); 5781da177e4SLinus Torvalds if (fd >= 0) { 579cbb60b92SDominik Brodowski ksys_ioctl(fd, TCGETS, (long)&termios); 5801da177e4SLinus Torvalds termios.c_lflag &= ~ICANON; 581cbb60b92SDominik Brodowski ksys_ioctl(fd, TCSETSF, (long)&termios); 5823ce4a7bfSDominik Brodowski ksys_read(fd, &c, 1); 5831da177e4SLinus Torvalds termios.c_lflag |= ICANON; 584cbb60b92SDominik Brodowski ksys_ioctl(fd, TCSETSF, (long)&termios); 5852ca2a09dSDominik Brodowski ksys_close(fd); 5861da177e4SLinus Torvalds } 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds #endif 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds void __init mount_root(void) 5911da177e4SLinus Torvalds { 5921da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 593377485f6SSasha Levin if (ROOT_DEV == Root_NFS) { 5941da177e4SLinus Torvalds if (mount_nfs_root()) 5951da177e4SLinus Torvalds return; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 5981da177e4SLinus Torvalds ROOT_DEV = Root_FD0; 5991da177e4SLinus Torvalds } 6001da177e4SLinus Torvalds #endif 6018902dd52SPaulo Alcantara (SUSE) #ifdef CONFIG_CIFS_ROOT 6028902dd52SPaulo Alcantara (SUSE) if (ROOT_DEV == Root_CIFS) { 6038902dd52SPaulo Alcantara (SUSE) if (mount_cifs_root()) 6048902dd52SPaulo Alcantara (SUSE) return; 6058902dd52SPaulo Alcantara (SUSE) 6068902dd52SPaulo Alcantara (SUSE) printk(KERN_ERR "VFS: Unable to mount root fs via SMB, trying floppy.\n"); 6078902dd52SPaulo Alcantara (SUSE) ROOT_DEV = Root_FD0; 6088902dd52SPaulo Alcantara (SUSE) } 6098902dd52SPaulo Alcantara (SUSE) #endif 6101da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_FD 6111da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 6121da177e4SLinus Torvalds /* rd_doload is 2 for a dual initrd/ramload setup */ 6131da177e4SLinus Torvalds if (rd_doload==2) { 6141da177e4SLinus Torvalds if (rd_load_disk(1)) { 6151da177e4SLinus Torvalds ROOT_DEV = Root_RAM1; 6161da177e4SLinus Torvalds root_device_name = NULL; 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds } else 6191da177e4SLinus Torvalds change_floppy("root floppy"); 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds #endif 6229361401eSDavid Howells #ifdef CONFIG_BLOCK 623c69e3c3aSVishnu Pratap Singh { 624c69e3c3aSVishnu Pratap Singh int err = create_dev("/dev/root", ROOT_DEV); 625c69e3c3aSVishnu Pratap Singh 626c69e3c3aSVishnu Pratap Singh if (err < 0) 627c69e3c3aSVishnu Pratap Singh pr_emerg("Failed to create /dev/root: %d\n", err); 6281da177e4SLinus Torvalds mount_block_root("/dev/root", root_mountflags); 629c69e3c3aSVishnu Pratap Singh } 6309361401eSDavid Howells #endif 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* 6341da177e4SLinus Torvalds * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 6351da177e4SLinus Torvalds */ 6361da177e4SLinus Torvalds void __init prepare_namespace(void) 6371da177e4SLinus Torvalds { 6381da177e4SLinus Torvalds int is_floppy; 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds if (root_delay) { 6411da177e4SLinus Torvalds printk(KERN_INFO "Waiting %d sec before mounting root device...\n", 6421da177e4SLinus Torvalds root_delay); 6431da177e4SLinus Torvalds ssleep(root_delay); 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 646216773a7SArjan van de Ven /* 647216773a7SArjan van de Ven * wait for the known devices to complete their probing 648216773a7SArjan van de Ven * 649216773a7SArjan van de Ven * Note: this is a potential source of long boot delays. 650216773a7SArjan van de Ven * For example, it is not atypical to wait 5 seconds here 651216773a7SArjan van de Ven * for the touchpad of a laptop to initialize. 652216773a7SArjan van de Ven */ 653216773a7SArjan van de Ven wait_for_device_probe(); 654d779249eSGreg Kroah-Hartman 6551da177e4SLinus Torvalds md_run_setup(); 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds if (saved_root_name[0]) { 6581da177e4SLinus Torvalds root_device_name = saved_root_name; 6592d62f488SAdrian Hunter if (!strncmp(root_device_name, "mtd", 3) || 6602d62f488SAdrian Hunter !strncmp(root_device_name, "ubi", 3)) { 661e9482b43SJoern Engel mount_block_root(root_device_name, root_mountflags); 662e9482b43SJoern Engel goto out; 663e9482b43SJoern Engel } 6641da177e4SLinus Torvalds ROOT_DEV = name_to_dev_t(root_device_name); 6651da177e4SLinus Torvalds if (strncmp(root_device_name, "/dev/", 5) == 0) 6661da177e4SLinus Torvalds root_device_name += 5; 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds if (initrd_load()) 6701da177e4SLinus Torvalds goto out; 6711da177e4SLinus Torvalds 672cc1ed754SPierre Ossman /* wait for any asynchronous scanning to complete */ 673cc1ed754SPierre Ossman if ((ROOT_DEV == 0) && root_wait) { 674cc1ed754SPierre Ossman printk(KERN_INFO "Waiting for root device %s...\n", 675cc1ed754SPierre Ossman saved_root_name); 676cc1ed754SPierre Ossman while (driver_probe_done() != 0 || 677cc1ed754SPierre Ossman (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 67839a0e975SJungseung Lee msleep(5); 679216773a7SArjan van de Ven async_synchronize_full(); 680cc1ed754SPierre Ossman } 681cc1ed754SPierre Ossman 682cc1ed754SPierre Ossman is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 683cc1ed754SPierre Ossman 6841da177e4SLinus Torvalds if (is_floppy && rd_doload && rd_load_disk(0)) 6851da177e4SLinus Torvalds ROOT_DEV = Root_RAM0; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds mount_root(); 6881da177e4SLinus Torvalds out: 6895e787dbfSDominik Brodowski devtmpfs_mount(); 690cccaa5e3SDominik Brodowski do_mount(".", "/", NULL, MS_MOVE, NULL); 691a16fe33aSDominik Brodowski ksys_chroot("."); 6921da177e4SLinus Torvalds } 69357f150a5SRob Landley 6946e19ededSRob Landley static bool is_tmpfs; 695f3235626SDavid Howells static int rootfs_init_fs_context(struct fs_context *fc) 69657f150a5SRob Landley { 6976e19ededSRob Landley if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) 698f3235626SDavid Howells return shmem_init_fs_context(fc); 6996e19ededSRob Landley 700f3235626SDavid Howells return ramfs_init_fs_context(fc); 70157f150a5SRob Landley } 70257f150a5SRob Landley 703fd3e007fSAl Viro struct file_system_type rootfs_fs_type = { 70457f150a5SRob Landley .name = "rootfs", 705f3235626SDavid Howells .init_fs_context = rootfs_init_fs_context, 70657f150a5SRob Landley .kill_sb = kill_litter_super, 70757f150a5SRob Landley }; 70857f150a5SRob Landley 709037f11b4SAl Viro void __init init_rootfs(void) 71057f150a5SRob Landley { 7116e19ededSRob Landley if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && 712037f11b4SAl Viro (!root_fs_names || strstr(root_fs_names, "tmpfs"))) 7136e19ededSRob Landley is_tmpfs = true; 71457f150a5SRob Landley } 715