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> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include <linux/nfs_fs.h> 311da177e4SLinus Torvalds #include <linux/nfs_fs_sb.h> 321da177e4SLinus Torvalds #include <linux/nfs_mount.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include "do_mounts.h" 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 371da177e4SLinus Torvalds 389b04c997STheodore Ts'o int root_mountflags = MS_RDONLY | MS_SILENT; 39f56f6d30SAdrian Bunk static char * __initdata root_device_name; 401da177e4SLinus Torvalds static char __initdata saved_root_name[64]; 4179975f13SWill Drewry static int root_wait; 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds dev_t ROOT_DEV; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds static int __init load_ramdisk(char *str) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds rd_doload = simple_strtol(str,NULL,0) & 3; 481da177e4SLinus Torvalds return 1; 491da177e4SLinus Torvalds } 501da177e4SLinus Torvalds __setup("load_ramdisk=", load_ramdisk); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds static int __init readonly(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 static int __init readwrite(char *str) 611da177e4SLinus Torvalds { 621da177e4SLinus Torvalds if (*str) 631da177e4SLinus Torvalds return 0; 641da177e4SLinus Torvalds root_mountflags &= ~MS_RDONLY; 651da177e4SLinus Torvalds return 1; 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds __setup("ro", readonly); 691da177e4SLinus Torvalds __setup("rw", readwrite); 701da177e4SLinus Torvalds 716d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 721ad7e899SStephen Warren struct uuidcmp { 731ad7e899SStephen Warren const char *uuid; 741ad7e899SStephen Warren int len; 751ad7e899SStephen Warren }; 761ad7e899SStephen Warren 77b5af921eSWill Drewry /** 78b5af921eSWill Drewry * match_dev_by_uuid - callback for finding a partition using its uuid 79b5af921eSWill Drewry * @dev: device passed in by the caller 801ad7e899SStephen Warren * @data: opaque pointer to the desired struct uuidcmp to match 81b5af921eSWill Drewry * 82b5af921eSWill Drewry * Returns 1 if the device matches, and 0 otherwise. 83b5af921eSWill Drewry */ 8438b6f45aSJens Axboe static int match_dev_by_uuid(struct device *dev, void *data) 85b5af921eSWill Drewry { 861ad7e899SStephen Warren struct uuidcmp *cmp = data; 87b5af921eSWill Drewry struct hd_struct *part = dev_to_part(dev); 88b5af921eSWill Drewry 89b5af921eSWill Drewry if (!part->info) 90b5af921eSWill Drewry goto no_match; 91b5af921eSWill Drewry 921ad7e899SStephen Warren if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) 93b5af921eSWill Drewry goto no_match; 94b5af921eSWill Drewry 95b5af921eSWill Drewry return 1; 96b5af921eSWill Drewry no_match: 97b5af921eSWill Drewry return 0; 98b5af921eSWill Drewry } 99b5af921eSWill Drewry 100b5af921eSWill Drewry 101b5af921eSWill Drewry /** 102b5af921eSWill Drewry * devt_from_partuuid - looks up the dev_t of a partition by its UUID 1031ad7e899SStephen Warren * @uuid: char array containing ascii UUID 104b5af921eSWill Drewry * 105b5af921eSWill Drewry * The function will return the first partition which contains a matching 106b5af921eSWill Drewry * UUID value in its partition_meta_info struct. This does not search 107b5af921eSWill Drewry * by filesystem UUIDs. 108b5af921eSWill Drewry * 10979975f13SWill Drewry * If @uuid is followed by a "/PARTNROFF=%d", then the number will be 11079975f13SWill Drewry * extracted and used as an offset from the partition identified by the UUID. 11179975f13SWill Drewry * 112b5af921eSWill Drewry * Returns the matching dev_t on success or 0 on failure. 113b5af921eSWill Drewry */ 1141ad7e899SStephen Warren static dev_t devt_from_partuuid(const char *uuid_str) 115b5af921eSWill Drewry { 116b5af921eSWill Drewry dev_t res = 0; 1171ad7e899SStephen Warren struct uuidcmp cmp; 118b5af921eSWill Drewry struct device *dev = NULL; 11979975f13SWill Drewry struct gendisk *disk; 12079975f13SWill Drewry struct hd_struct *part; 12179975f13SWill Drewry int offset = 0; 12279975f13SWill Drewry 12379975f13SWill Drewry if (strlen(uuid_str) < 36) 12479975f13SWill Drewry goto done; 12579975f13SWill Drewry 1261ad7e899SStephen Warren cmp.uuid = uuid_str; 1271ad7e899SStephen Warren cmp.len = 36; 1281ad7e899SStephen Warren 12979975f13SWill Drewry /* Check for optional partition number offset attributes. */ 13079975f13SWill Drewry if (uuid_str[36]) { 13179975f13SWill Drewry char c = 0; 13279975f13SWill Drewry /* Explicitly fail on poor PARTUUID syntax. */ 13379975f13SWill Drewry if (sscanf(&uuid_str[36], 13479975f13SWill Drewry "/PARTNROFF=%d%c", &offset, &c) != 1) { 13579975f13SWill Drewry printk(KERN_ERR "VFS: PARTUUID= is invalid.\n" 13679975f13SWill Drewry "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); 13779975f13SWill Drewry if (root_wait) 13879975f13SWill Drewry printk(KERN_ERR 13979975f13SWill Drewry "Disabling rootwait; root= is invalid.\n"); 14079975f13SWill Drewry root_wait = 0; 14179975f13SWill Drewry goto done; 14279975f13SWill Drewry } 14379975f13SWill Drewry } 144b5af921eSWill Drewry 1451ad7e899SStephen Warren dev = class_find_device(&block_class, NULL, &cmp, 1461ad7e899SStephen Warren &match_dev_by_uuid); 147b5af921eSWill Drewry if (!dev) 148b5af921eSWill Drewry goto done; 149b5af921eSWill Drewry 150b5af921eSWill Drewry res = dev->devt; 151b5af921eSWill Drewry 15279975f13SWill Drewry /* Attempt to find the partition by offset. */ 15379975f13SWill Drewry if (!offset) 15479975f13SWill Drewry goto no_offset; 15579975f13SWill Drewry 15679975f13SWill Drewry res = 0; 15779975f13SWill Drewry disk = part_to_disk(dev_to_part(dev)); 15879975f13SWill Drewry part = disk_get_part(disk, dev_to_part(dev)->partno + offset); 15979975f13SWill Drewry if (part) { 16079975f13SWill Drewry res = part_devt(part); 16179975f13SWill Drewry put_device(part_to_dev(part)); 16279975f13SWill Drewry } 16379975f13SWill Drewry 16479975f13SWill Drewry no_offset: 16579975f13SWill Drewry put_device(dev); 166b5af921eSWill Drewry done: 167b5af921eSWill Drewry return res; 168b5af921eSWill Drewry } 1696d0aed7aSJens Axboe #endif 170b5af921eSWill Drewry 1711da177e4SLinus Torvalds /* 1721da177e4SLinus Torvalds * Convert a name into device number. We accept the following variants: 1731da177e4SLinus Torvalds * 1741da177e4SLinus Torvalds * 1) device number in hexadecimal represents itself 1751da177e4SLinus Torvalds * 2) /dev/nfs represents Root_NFS (0xff) 1761da177e4SLinus Torvalds * 3) /dev/<disk_name> represents the device number of disk 1771da177e4SLinus Torvalds * 4) /dev/<disk_name><decimal> represents the device number 1781da177e4SLinus Torvalds * of partition - device number of disk plus the partition number 1791da177e4SLinus Torvalds * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 1801da177e4SLinus Torvalds * used when disk name of partitioned disk ends on a digit. 181b5af921eSWill Drewry * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 182b5af921eSWill Drewry * unique id of a partition if the partition table provides it. 18379975f13SWill Drewry * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to 18479975f13SWill Drewry * a partition with a known unique id. 1851da177e4SLinus Torvalds * 186edfaa7c3SKay Sievers * If name doesn't have fall into the categories above, we return (0,0). 187edfaa7c3SKay Sievers * block_class is used to check if something is a disk name. If the disk 188edfaa7c3SKay Sievers * name contains slashes, the device name has them replaced with 189edfaa7c3SKay Sievers * bangs. 1901da177e4SLinus Torvalds */ 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds dev_t name_to_dev_t(char *name) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds char s[32]; 1951da177e4SLinus Torvalds char *p; 1961da177e4SLinus Torvalds dev_t res = 0; 19730f2f0ebSKay Sievers int part; 1981da177e4SLinus Torvalds 1996d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 200b5af921eSWill Drewry if (strncmp(name, "PARTUUID=", 9) == 0) { 201b5af921eSWill Drewry name += 9; 202b5af921eSWill Drewry res = devt_from_partuuid(name); 203b5af921eSWill Drewry if (!res) 204b5af921eSWill Drewry goto fail; 205b5af921eSWill Drewry goto done; 206b5af921eSWill Drewry } 2076d0aed7aSJens Axboe #endif 208b5af921eSWill Drewry 2091da177e4SLinus Torvalds if (strncmp(name, "/dev/", 5) != 0) { 2101da177e4SLinus Torvalds unsigned maj, min; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds if (sscanf(name, "%u:%u", &maj, &min) == 2) { 2131da177e4SLinus Torvalds res = MKDEV(maj, min); 2141da177e4SLinus Torvalds if (maj != MAJOR(res) || min != MINOR(res)) 2151da177e4SLinus Torvalds goto fail; 2161da177e4SLinus Torvalds } else { 2171da177e4SLinus Torvalds res = new_decode_dev(simple_strtoul(name, &p, 16)); 2181da177e4SLinus Torvalds if (*p) 2191da177e4SLinus Torvalds goto fail; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds goto done; 2221da177e4SLinus Torvalds } 223edfaa7c3SKay Sievers 2241da177e4SLinus Torvalds name += 5; 2251da177e4SLinus Torvalds res = Root_NFS; 2261da177e4SLinus Torvalds if (strcmp(name, "nfs") == 0) 2271da177e4SLinus Torvalds goto done; 2281da177e4SLinus Torvalds res = Root_RAM0; 2291da177e4SLinus Torvalds if (strcmp(name, "ram") == 0) 2301da177e4SLinus Torvalds goto done; 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds if (strlen(name) > 31) 2331da177e4SLinus Torvalds goto fail; 2341da177e4SLinus Torvalds strcpy(s, name); 2351da177e4SLinus Torvalds for (p = s; *p; p++) 2361da177e4SLinus Torvalds if (*p == '/') 2371da177e4SLinus Torvalds *p = '!'; 23830f2f0ebSKay Sievers res = blk_lookup_devt(s, 0); 23930f2f0ebSKay Sievers if (res) 24030f2f0ebSKay Sievers goto done; 24130f2f0ebSKay Sievers 24230f2f0ebSKay Sievers /* 24325985edcSLucas De Marchi * try non-existent, but valid partition, which may only exist 24430f2f0ebSKay Sievers * after revalidating the disk, like partitioned md devices 24530f2f0ebSKay Sievers */ 24630f2f0ebSKay Sievers while (p > s && isdigit(p[-1])) 24730f2f0ebSKay Sievers p--; 24830f2f0ebSKay Sievers if (p == s || !*p || *p == '0') 24930f2f0ebSKay Sievers goto fail; 25030f2f0ebSKay Sievers 25130f2f0ebSKay Sievers /* try disk name without <part number> */ 25230f2f0ebSKay Sievers part = simple_strtoul(p, NULL, 10); 25330f2f0ebSKay Sievers *p = '\0'; 25430f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 25530f2f0ebSKay Sievers if (res) 25630f2f0ebSKay Sievers goto done; 25730f2f0ebSKay Sievers 25830f2f0ebSKay Sievers /* try disk name without p<part number> */ 25930f2f0ebSKay Sievers if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') 26030f2f0ebSKay Sievers goto fail; 26130f2f0ebSKay Sievers p[-1] = '\0'; 26230f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 2631da177e4SLinus Torvalds if (res) 2641da177e4SLinus Torvalds goto done; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds fail: 267edfaa7c3SKay Sievers return 0; 268edfaa7c3SKay Sievers done: 269edfaa7c3SKay Sievers return res; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds static int __init root_dev_setup(char *line) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds strlcpy(saved_root_name, line, sizeof(saved_root_name)); 2751da177e4SLinus Torvalds return 1; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds __setup("root=", root_dev_setup); 2791da177e4SLinus Torvalds 280cc1ed754SPierre Ossman static int __init rootwait_setup(char *str) 281cc1ed754SPierre Ossman { 282cc1ed754SPierre Ossman if (*str) 283cc1ed754SPierre Ossman return 0; 284cc1ed754SPierre Ossman root_wait = 1; 285cc1ed754SPierre Ossman return 1; 286cc1ed754SPierre Ossman } 287cc1ed754SPierre Ossman 288cc1ed754SPierre Ossman __setup("rootwait", rootwait_setup); 289cc1ed754SPierre Ossman 2901da177e4SLinus Torvalds static char * __initdata root_mount_data; 2911da177e4SLinus Torvalds static int __init root_data_setup(char *str) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds root_mount_data = str; 2941da177e4SLinus Torvalds return 1; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds static char * __initdata root_fs_names; 2981da177e4SLinus Torvalds static int __init fs_names_setup(char *str) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds root_fs_names = str; 3011da177e4SLinus Torvalds return 1; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds static unsigned int __initdata root_delay; 3051da177e4SLinus Torvalds static int __init root_delay_setup(char *str) 3061da177e4SLinus Torvalds { 3071da177e4SLinus Torvalds root_delay = simple_strtoul(str, NULL, 0); 3081da177e4SLinus Torvalds return 1; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds __setup("rootflags=", root_data_setup); 3121da177e4SLinus Torvalds __setup("rootfstype=", fs_names_setup); 3131da177e4SLinus Torvalds __setup("rootdelay=", root_delay_setup); 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds static void __init get_fs_names(char *page) 3161da177e4SLinus Torvalds { 3171da177e4SLinus Torvalds char *s = page; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds if (root_fs_names) { 3201da177e4SLinus Torvalds strcpy(page, root_fs_names); 3211da177e4SLinus Torvalds while (*s++) { 3221da177e4SLinus Torvalds if (s[-1] == ',') 3231da177e4SLinus Torvalds s[-1] = '\0'; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds } else { 3261da177e4SLinus Torvalds int len = get_filesystem_list(page); 3271da177e4SLinus Torvalds char *p, *next; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds page[len] = '\0'; 3301da177e4SLinus Torvalds for (p = page-1; p; p = next) { 3311da177e4SLinus Torvalds next = strchr(++p, '\n'); 3321da177e4SLinus Torvalds if (*p++ != '\t') 3331da177e4SLinus Torvalds continue; 3341da177e4SLinus Torvalds while ((*s++ = *p++) != '\n') 3351da177e4SLinus Torvalds ; 3361da177e4SLinus Torvalds s[-1] = '\0'; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds *s = '\0'; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds static int __init do_mount_root(char *name, char *fs, int flags, void *data) 3431da177e4SLinus Torvalds { 344d8c9584eSAl Viro struct super_block *s; 3451da177e4SLinus Torvalds int err = sys_mount(name, "/root", fs, flags, data); 3461da177e4SLinus Torvalds if (err) 3471da177e4SLinus Torvalds return err; 3481da177e4SLinus Torvalds 349c67e5382SH Hartley Sweeten sys_chdir("/root"); 350d8c9584eSAl Viro s = current->fs->pwd.dentry->d_sb; 351d8c9584eSAl Viro ROOT_DEV = s->s_dev; 35280cdc6daSMandeep Singh Baines printk(KERN_INFO 35380cdc6daSMandeep Singh Baines "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", 354d8c9584eSAl Viro s->s_type->name, 355d8c9584eSAl Viro s->s_flags & MS_RDONLY ? " readonly" : "", 356d8c9584eSAl Viro MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); 3571da177e4SLinus Torvalds return 0; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds void __init mount_block_root(char *name, int flags) 3611da177e4SLinus Torvalds { 362a608ca21SJeff Layton struct page *page = alloc_page(GFP_KERNEL | 363a608ca21SJeff Layton __GFP_NOTRACK_FALSE_POSITIVE); 364a608ca21SJeff Layton char *fs_names = page_address(page); 3651da177e4SLinus Torvalds char *p; 3669361401eSDavid Howells #ifdef CONFIG_BLOCK 3671da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3689361401eSDavid Howells #else 3699361401eSDavid Howells const char *b = name; 3709361401eSDavid Howells #endif 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds get_fs_names(fs_names); 3731da177e4SLinus Torvalds retry: 3741da177e4SLinus Torvalds for (p = fs_names; *p; p += strlen(p)+1) { 3751da177e4SLinus Torvalds int err = do_mount_root(name, p, flags, root_mount_data); 3761da177e4SLinus Torvalds switch (err) { 3771da177e4SLinus Torvalds case 0: 3781da177e4SLinus Torvalds goto out; 3791da177e4SLinus Torvalds case -EACCES: 3801da177e4SLinus Torvalds flags |= MS_RDONLY; 3811da177e4SLinus Torvalds goto retry; 3821da177e4SLinus Torvalds case -EINVAL: 3831da177e4SLinus Torvalds continue; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds /* 3861da177e4SLinus Torvalds * Allow the user to distinguish between failed sys_open 3871da177e4SLinus Torvalds * and bad superblock on root device. 388dd2a345fSDave Gilbert * and give them a list of the available devices 3891da177e4SLinus Torvalds */ 3909361401eSDavid Howells #ifdef CONFIG_BLOCK 3911da177e4SLinus Torvalds __bdevname(ROOT_DEV, b); 3929361401eSDavid Howells #endif 3930e0cb892SBernhard Walle printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", 3940e0cb892SBernhard Walle root_device_name, b, err); 395dd2a345fSDave Gilbert printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 3961da177e4SLinus Torvalds 397dd2a345fSDave Gilbert printk_all_partitions(); 39855dc7db7STejun Heo #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT 39955dc7db7STejun Heo printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " 40055dc7db7STejun Heo "explicit textual name for \"root=\" boot option.\n"); 40155dc7db7STejun Heo #endif 4021da177e4SLinus Torvalds panic("VFS: Unable to mount root fs on %s", b); 4031da177e4SLinus Torvalds } 404be6e028bSAndy Whitcroft 405dd2a345fSDave Gilbert printk("List of all partitions:\n"); 406dd2a345fSDave Gilbert printk_all_partitions(); 407be6e028bSAndy Whitcroft printk("No filesystem could mount root, tried: "); 408be6e028bSAndy Whitcroft for (p = fs_names; *p; p += strlen(p)+1) 409be6e028bSAndy Whitcroft printk(" %s", p); 410be6e028bSAndy Whitcroft printk("\n"); 4119361401eSDavid Howells #ifdef CONFIG_BLOCK 4129361401eSDavid Howells __bdevname(ROOT_DEV, b); 4139361401eSDavid Howells #endif 4149361401eSDavid Howells panic("VFS: Unable to mount root fs on %s", b); 4151da177e4SLinus Torvalds out: 416a608ca21SJeff Layton put_page(page); 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 42043717c7dSChuck Lever 42143717c7dSChuck Lever #define NFSROOT_TIMEOUT_MIN 5 42243717c7dSChuck Lever #define NFSROOT_TIMEOUT_MAX 30 42343717c7dSChuck Lever #define NFSROOT_RETRY_MAX 5 42443717c7dSChuck Lever 4251da177e4SLinus Torvalds static int __init mount_nfs_root(void) 4261da177e4SLinus Torvalds { 42756463e50SChuck Lever char *root_dev, *root_data; 42843717c7dSChuck Lever unsigned int timeout; 42943717c7dSChuck Lever int try, err; 4301da177e4SLinus Torvalds 43143717c7dSChuck Lever err = nfs_root_data(&root_dev, &root_data); 43243717c7dSChuck Lever if (err != 0) 4331da177e4SLinus Torvalds return 0; 43443717c7dSChuck Lever 43543717c7dSChuck Lever /* 43643717c7dSChuck Lever * The server or network may not be ready, so try several 43743717c7dSChuck Lever * times. Stop after a few tries in case the client wants 43843717c7dSChuck Lever * to fall back to other boot methods. 43943717c7dSChuck Lever */ 44043717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MIN; 44143717c7dSChuck Lever for (try = 1; ; try++) { 44243717c7dSChuck Lever err = do_mount_root(root_dev, "nfs", 44343717c7dSChuck Lever root_mountflags, root_data); 44443717c7dSChuck Lever if (err == 0) 44556463e50SChuck Lever return 1; 44643717c7dSChuck Lever if (try > NFSROOT_RETRY_MAX) 44743717c7dSChuck Lever break; 44843717c7dSChuck Lever 44943717c7dSChuck Lever /* Wait, in case the server refused us immediately */ 45043717c7dSChuck Lever ssleep(timeout); 45143717c7dSChuck Lever timeout <<= 1; 45243717c7dSChuck Lever if (timeout > NFSROOT_TIMEOUT_MAX) 45343717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MAX; 45443717c7dSChuck Lever } 45543717c7dSChuck Lever return 0; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds #endif 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 4601da177e4SLinus Torvalds void __init change_floppy(char *fmt, ...) 4611da177e4SLinus Torvalds { 4621da177e4SLinus Torvalds struct termios termios; 4631da177e4SLinus Torvalds char buf[80]; 4641da177e4SLinus Torvalds char c; 4651da177e4SLinus Torvalds int fd; 4661da177e4SLinus Torvalds va_list args; 4671da177e4SLinus Torvalds va_start(args, fmt); 4681da177e4SLinus Torvalds vsprintf(buf, fmt, args); 4691da177e4SLinus Torvalds va_end(args); 4701da177e4SLinus Torvalds fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 4711da177e4SLinus Torvalds if (fd >= 0) { 4721da177e4SLinus Torvalds sys_ioctl(fd, FDEJECT, 0); 4731da177e4SLinus Torvalds sys_close(fd); 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 4761da177e4SLinus Torvalds fd = sys_open("/dev/console", O_RDWR, 0); 4771da177e4SLinus Torvalds if (fd >= 0) { 4781da177e4SLinus Torvalds sys_ioctl(fd, TCGETS, (long)&termios); 4791da177e4SLinus Torvalds termios.c_lflag &= ~ICANON; 4801da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 4811da177e4SLinus Torvalds sys_read(fd, &c, 1); 4821da177e4SLinus Torvalds termios.c_lflag |= ICANON; 4831da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 4841da177e4SLinus Torvalds sys_close(fd); 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds #endif 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds void __init mount_root(void) 4901da177e4SLinus Torvalds { 4911da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 492377485f6SSasha Levin if (ROOT_DEV == Root_NFS) { 4931da177e4SLinus Torvalds if (mount_nfs_root()) 4941da177e4SLinus Torvalds return; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 4971da177e4SLinus Torvalds ROOT_DEV = Root_FD0; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds #endif 5001da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_FD 5011da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 5021da177e4SLinus Torvalds /* rd_doload is 2 for a dual initrd/ramload setup */ 5031da177e4SLinus Torvalds if (rd_doload==2) { 5041da177e4SLinus Torvalds if (rd_load_disk(1)) { 5051da177e4SLinus Torvalds ROOT_DEV = Root_RAM1; 5061da177e4SLinus Torvalds root_device_name = NULL; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds } else 5091da177e4SLinus Torvalds change_floppy("root floppy"); 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds #endif 5129361401eSDavid Howells #ifdef CONFIG_BLOCK 513bdaf8529SGreg Kroah-Hartman create_dev("/dev/root", ROOT_DEV); 5141da177e4SLinus Torvalds mount_block_root("/dev/root", root_mountflags); 5159361401eSDavid Howells #endif 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds /* 5191da177e4SLinus Torvalds * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 5201da177e4SLinus Torvalds */ 5211da177e4SLinus Torvalds void __init prepare_namespace(void) 5221da177e4SLinus Torvalds { 5231da177e4SLinus Torvalds int is_floppy; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds if (root_delay) { 5261da177e4SLinus Torvalds printk(KERN_INFO "Waiting %dsec before mounting root device...\n", 5271da177e4SLinus Torvalds root_delay); 5281da177e4SLinus Torvalds ssleep(root_delay); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 531216773a7SArjan van de Ven /* 532216773a7SArjan van de Ven * wait for the known devices to complete their probing 533216773a7SArjan van de Ven * 534216773a7SArjan van de Ven * Note: this is a potential source of long boot delays. 535216773a7SArjan van de Ven * For example, it is not atypical to wait 5 seconds here 536216773a7SArjan van de Ven * for the touchpad of a laptop to initialize. 537216773a7SArjan van de Ven */ 538216773a7SArjan van de Ven wait_for_device_probe(); 539d779249eSGreg Kroah-Hartman 5401da177e4SLinus Torvalds md_run_setup(); 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds if (saved_root_name[0]) { 5431da177e4SLinus Torvalds root_device_name = saved_root_name; 5442d62f488SAdrian Hunter if (!strncmp(root_device_name, "mtd", 3) || 5452d62f488SAdrian Hunter !strncmp(root_device_name, "ubi", 3)) { 546e9482b43SJoern Engel mount_block_root(root_device_name, root_mountflags); 547e9482b43SJoern Engel goto out; 548e9482b43SJoern Engel } 5491da177e4SLinus Torvalds ROOT_DEV = name_to_dev_t(root_device_name); 5501da177e4SLinus Torvalds if (strncmp(root_device_name, "/dev/", 5) == 0) 5511da177e4SLinus Torvalds root_device_name += 5; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds if (initrd_load()) 5551da177e4SLinus Torvalds goto out; 5561da177e4SLinus Torvalds 557cc1ed754SPierre Ossman /* wait for any asynchronous scanning to complete */ 558cc1ed754SPierre Ossman if ((ROOT_DEV == 0) && root_wait) { 559cc1ed754SPierre Ossman printk(KERN_INFO "Waiting for root device %s...\n", 560cc1ed754SPierre Ossman saved_root_name); 561cc1ed754SPierre Ossman while (driver_probe_done() != 0 || 562cc1ed754SPierre Ossman (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 563cc1ed754SPierre Ossman msleep(100); 564216773a7SArjan van de Ven async_synchronize_full(); 565cc1ed754SPierre Ossman } 566cc1ed754SPierre Ossman 567cc1ed754SPierre Ossman is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 568cc1ed754SPierre Ossman 5691da177e4SLinus Torvalds if (is_floppy && rd_doload && rd_load_disk(0)) 5701da177e4SLinus Torvalds ROOT_DEV = Root_RAM0; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds mount_root(); 5731da177e4SLinus Torvalds out: 5742b2af54aSKay Sievers devtmpfs_mount("dev"); 5751da177e4SLinus Torvalds sys_mount(".", "/", NULL, MS_MOVE, NULL); 576c67e5382SH Hartley Sweeten sys_chroot("."); 5771da177e4SLinus Torvalds } 578