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> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include <linux/nfs_fs.h> 211da177e4SLinus Torvalds #include <linux/nfs_fs_sb.h> 221da177e4SLinus Torvalds #include <linux/nfs_mount.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include "do_mounts.h" 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 271da177e4SLinus Torvalds 289b04c997STheodore Ts'o int root_mountflags = MS_RDONLY | MS_SILENT; 29f56f6d30SAdrian Bunk static char * __initdata root_device_name; 301da177e4SLinus Torvalds static char __initdata saved_root_name[64]; 3179975f13SWill Drewry static int root_wait; 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds dev_t ROOT_DEV; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds static int __init load_ramdisk(char *str) 361da177e4SLinus Torvalds { 371da177e4SLinus Torvalds rd_doload = simple_strtol(str,NULL,0) & 3; 381da177e4SLinus Torvalds return 1; 391da177e4SLinus Torvalds } 401da177e4SLinus Torvalds __setup("load_ramdisk=", load_ramdisk); 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds static int __init readonly(char *str) 431da177e4SLinus Torvalds { 441da177e4SLinus Torvalds if (*str) 451da177e4SLinus Torvalds return 0; 461da177e4SLinus Torvalds root_mountflags |= MS_RDONLY; 471da177e4SLinus Torvalds return 1; 481da177e4SLinus Torvalds } 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds static int __init readwrite(char *str) 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds if (*str) 531da177e4SLinus Torvalds return 0; 541da177e4SLinus Torvalds root_mountflags &= ~MS_RDONLY; 551da177e4SLinus Torvalds return 1; 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds __setup("ro", readonly); 591da177e4SLinus Torvalds __setup("rw", readwrite); 601da177e4SLinus Torvalds 616d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 62b5af921eSWill Drewry /** 63b5af921eSWill Drewry * match_dev_by_uuid - callback for finding a partition using its uuid 64b5af921eSWill Drewry * @dev: device passed in by the caller 65b5af921eSWill Drewry * @data: opaque pointer to a 36 byte char array with a UUID 66b5af921eSWill Drewry * 67b5af921eSWill Drewry * Returns 1 if the device matches, and 0 otherwise. 68b5af921eSWill Drewry */ 6938b6f45aSJens Axboe static int match_dev_by_uuid(struct device *dev, void *data) 70b5af921eSWill Drewry { 71b5af921eSWill Drewry u8 *uuid = data; 72b5af921eSWill Drewry struct hd_struct *part = dev_to_part(dev); 73b5af921eSWill Drewry 74b5af921eSWill Drewry if (!part->info) 75b5af921eSWill Drewry goto no_match; 76b5af921eSWill Drewry 77b5af921eSWill Drewry if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid))) 78b5af921eSWill Drewry goto no_match; 79b5af921eSWill Drewry 80b5af921eSWill Drewry return 1; 81b5af921eSWill Drewry no_match: 82b5af921eSWill Drewry return 0; 83b5af921eSWill Drewry } 84b5af921eSWill Drewry 85b5af921eSWill Drewry 86b5af921eSWill Drewry /** 87b5af921eSWill Drewry * devt_from_partuuid - looks up the dev_t of a partition by its UUID 8879975f13SWill Drewry * @uuid: min 36 byte char array containing a hex ascii UUID 89b5af921eSWill Drewry * 90b5af921eSWill Drewry * The function will return the first partition which contains a matching 91b5af921eSWill Drewry * UUID value in its partition_meta_info struct. This does not search 92b5af921eSWill Drewry * by filesystem UUIDs. 93b5af921eSWill Drewry * 9479975f13SWill Drewry * If @uuid is followed by a "/PARTNROFF=%d", then the number will be 9579975f13SWill Drewry * extracted and used as an offset from the partition identified by the UUID. 9679975f13SWill Drewry * 97b5af921eSWill Drewry * Returns the matching dev_t on success or 0 on failure. 98b5af921eSWill Drewry */ 99a1cf11d8SJan Beulich static dev_t devt_from_partuuid(char *uuid_str) 100b5af921eSWill Drewry { 101b5af921eSWill Drewry dev_t res = 0; 102b5af921eSWill Drewry struct device *dev = NULL; 103b5af921eSWill Drewry u8 uuid[16]; 10479975f13SWill Drewry struct gendisk *disk; 10579975f13SWill Drewry struct hd_struct *part; 10679975f13SWill Drewry int offset = 0; 10779975f13SWill Drewry 10879975f13SWill Drewry if (strlen(uuid_str) < 36) 10979975f13SWill Drewry goto done; 11079975f13SWill Drewry 11179975f13SWill Drewry /* Check for optional partition number offset attributes. */ 11279975f13SWill Drewry if (uuid_str[36]) { 11379975f13SWill Drewry char c = 0; 11479975f13SWill Drewry /* Explicitly fail on poor PARTUUID syntax. */ 11579975f13SWill Drewry if (sscanf(&uuid_str[36], 11679975f13SWill Drewry "/PARTNROFF=%d%c", &offset, &c) != 1) { 11779975f13SWill Drewry printk(KERN_ERR "VFS: PARTUUID= is invalid.\n" 11879975f13SWill Drewry "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); 11979975f13SWill Drewry if (root_wait) 12079975f13SWill Drewry printk(KERN_ERR 12179975f13SWill Drewry "Disabling rootwait; root= is invalid.\n"); 12279975f13SWill Drewry root_wait = 0; 12379975f13SWill Drewry goto done; 12479975f13SWill Drewry } 12579975f13SWill Drewry } 126b5af921eSWill Drewry 127b5af921eSWill Drewry /* Pack the requested UUID in the expected format. */ 128b5af921eSWill Drewry part_pack_uuid(uuid_str, uuid); 129b5af921eSWill Drewry 130b5af921eSWill Drewry dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid); 131b5af921eSWill Drewry if (!dev) 132b5af921eSWill Drewry goto done; 133b5af921eSWill Drewry 134b5af921eSWill Drewry res = dev->devt; 135b5af921eSWill Drewry 13679975f13SWill Drewry /* Attempt to find the partition by offset. */ 13779975f13SWill Drewry if (!offset) 13879975f13SWill Drewry goto no_offset; 13979975f13SWill Drewry 14079975f13SWill Drewry res = 0; 14179975f13SWill Drewry disk = part_to_disk(dev_to_part(dev)); 14279975f13SWill Drewry part = disk_get_part(disk, dev_to_part(dev)->partno + offset); 14379975f13SWill Drewry if (part) { 14479975f13SWill Drewry res = part_devt(part); 14579975f13SWill Drewry put_device(part_to_dev(part)); 14679975f13SWill Drewry } 14779975f13SWill Drewry 14879975f13SWill Drewry no_offset: 14979975f13SWill Drewry put_device(dev); 150b5af921eSWill Drewry done: 151b5af921eSWill Drewry return res; 152b5af921eSWill Drewry } 1536d0aed7aSJens Axboe #endif 154b5af921eSWill Drewry 1551da177e4SLinus Torvalds /* 1561da177e4SLinus Torvalds * Convert a name into device number. We accept the following variants: 1571da177e4SLinus Torvalds * 1581da177e4SLinus Torvalds * 1) device number in hexadecimal represents itself 1591da177e4SLinus Torvalds * 2) /dev/nfs represents Root_NFS (0xff) 1601da177e4SLinus Torvalds * 3) /dev/<disk_name> represents the device number of disk 1611da177e4SLinus Torvalds * 4) /dev/<disk_name><decimal> represents the device number 1621da177e4SLinus Torvalds * of partition - device number of disk plus the partition number 1631da177e4SLinus Torvalds * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 1641da177e4SLinus Torvalds * used when disk name of partitioned disk ends on a digit. 165b5af921eSWill Drewry * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 166b5af921eSWill Drewry * unique id of a partition if the partition table provides it. 16779975f13SWill Drewry * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to 16879975f13SWill Drewry * a partition with a known unique id. 1691da177e4SLinus Torvalds * 170edfaa7c3SKay Sievers * If name doesn't have fall into the categories above, we return (0,0). 171edfaa7c3SKay Sievers * block_class is used to check if something is a disk name. If the disk 172edfaa7c3SKay Sievers * name contains slashes, the device name has them replaced with 173edfaa7c3SKay Sievers * bangs. 1741da177e4SLinus Torvalds */ 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds dev_t name_to_dev_t(char *name) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds char s[32]; 1791da177e4SLinus Torvalds char *p; 1801da177e4SLinus Torvalds dev_t res = 0; 18130f2f0ebSKay Sievers int part; 1821da177e4SLinus Torvalds 1836d0aed7aSJens Axboe #ifdef CONFIG_BLOCK 184b5af921eSWill Drewry if (strncmp(name, "PARTUUID=", 9) == 0) { 185b5af921eSWill Drewry name += 9; 186b5af921eSWill Drewry res = devt_from_partuuid(name); 187b5af921eSWill Drewry if (!res) 188b5af921eSWill Drewry goto fail; 189b5af921eSWill Drewry goto done; 190b5af921eSWill Drewry } 1916d0aed7aSJens Axboe #endif 192b5af921eSWill Drewry 1931da177e4SLinus Torvalds if (strncmp(name, "/dev/", 5) != 0) { 1941da177e4SLinus Torvalds unsigned maj, min; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds if (sscanf(name, "%u:%u", &maj, &min) == 2) { 1971da177e4SLinus Torvalds res = MKDEV(maj, min); 1981da177e4SLinus Torvalds if (maj != MAJOR(res) || min != MINOR(res)) 1991da177e4SLinus Torvalds goto fail; 2001da177e4SLinus Torvalds } else { 2011da177e4SLinus Torvalds res = new_decode_dev(simple_strtoul(name, &p, 16)); 2021da177e4SLinus Torvalds if (*p) 2031da177e4SLinus Torvalds goto fail; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds goto done; 2061da177e4SLinus Torvalds } 207edfaa7c3SKay Sievers 2081da177e4SLinus Torvalds name += 5; 2091da177e4SLinus Torvalds res = Root_NFS; 2101da177e4SLinus Torvalds if (strcmp(name, "nfs") == 0) 2111da177e4SLinus Torvalds goto done; 2121da177e4SLinus Torvalds res = Root_RAM0; 2131da177e4SLinus Torvalds if (strcmp(name, "ram") == 0) 2141da177e4SLinus Torvalds goto done; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds if (strlen(name) > 31) 2171da177e4SLinus Torvalds goto fail; 2181da177e4SLinus Torvalds strcpy(s, name); 2191da177e4SLinus Torvalds for (p = s; *p; p++) 2201da177e4SLinus Torvalds if (*p == '/') 2211da177e4SLinus Torvalds *p = '!'; 22230f2f0ebSKay Sievers res = blk_lookup_devt(s, 0); 22330f2f0ebSKay Sievers if (res) 22430f2f0ebSKay Sievers goto done; 22530f2f0ebSKay Sievers 22630f2f0ebSKay Sievers /* 22725985edcSLucas De Marchi * try non-existent, but valid partition, which may only exist 22830f2f0ebSKay Sievers * after revalidating the disk, like partitioned md devices 22930f2f0ebSKay Sievers */ 23030f2f0ebSKay Sievers while (p > s && isdigit(p[-1])) 23130f2f0ebSKay Sievers p--; 23230f2f0ebSKay Sievers if (p == s || !*p || *p == '0') 23330f2f0ebSKay Sievers goto fail; 23430f2f0ebSKay Sievers 23530f2f0ebSKay Sievers /* try disk name without <part number> */ 23630f2f0ebSKay Sievers part = simple_strtoul(p, NULL, 10); 23730f2f0ebSKay Sievers *p = '\0'; 23830f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 23930f2f0ebSKay Sievers if (res) 24030f2f0ebSKay Sievers goto done; 24130f2f0ebSKay Sievers 24230f2f0ebSKay Sievers /* try disk name without p<part number> */ 24330f2f0ebSKay Sievers if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') 24430f2f0ebSKay Sievers goto fail; 24530f2f0ebSKay Sievers p[-1] = '\0'; 24630f2f0ebSKay Sievers res = blk_lookup_devt(s, part); 2471da177e4SLinus Torvalds if (res) 2481da177e4SLinus Torvalds goto done; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds fail: 251edfaa7c3SKay Sievers return 0; 252edfaa7c3SKay Sievers done: 253edfaa7c3SKay Sievers return res; 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds static int __init root_dev_setup(char *line) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds strlcpy(saved_root_name, line, sizeof(saved_root_name)); 2591da177e4SLinus Torvalds return 1; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds __setup("root=", root_dev_setup); 2631da177e4SLinus Torvalds 264cc1ed754SPierre Ossman static int __init rootwait_setup(char *str) 265cc1ed754SPierre Ossman { 266cc1ed754SPierre Ossman if (*str) 267cc1ed754SPierre Ossman return 0; 268cc1ed754SPierre Ossman root_wait = 1; 269cc1ed754SPierre Ossman return 1; 270cc1ed754SPierre Ossman } 271cc1ed754SPierre Ossman 272cc1ed754SPierre Ossman __setup("rootwait", rootwait_setup); 273cc1ed754SPierre Ossman 2741da177e4SLinus Torvalds static char * __initdata root_mount_data; 2751da177e4SLinus Torvalds static int __init root_data_setup(char *str) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds root_mount_data = str; 2781da177e4SLinus Torvalds return 1; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds static char * __initdata root_fs_names; 2821da177e4SLinus Torvalds static int __init fs_names_setup(char *str) 2831da177e4SLinus Torvalds { 2841da177e4SLinus Torvalds root_fs_names = str; 2851da177e4SLinus Torvalds return 1; 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds static unsigned int __initdata root_delay; 2891da177e4SLinus Torvalds static int __init root_delay_setup(char *str) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds root_delay = simple_strtoul(str, NULL, 0); 2921da177e4SLinus Torvalds return 1; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds __setup("rootflags=", root_data_setup); 2961da177e4SLinus Torvalds __setup("rootfstype=", fs_names_setup); 2971da177e4SLinus Torvalds __setup("rootdelay=", root_delay_setup); 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds static void __init get_fs_names(char *page) 3001da177e4SLinus Torvalds { 3011da177e4SLinus Torvalds char *s = page; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds if (root_fs_names) { 3041da177e4SLinus Torvalds strcpy(page, root_fs_names); 3051da177e4SLinus Torvalds while (*s++) { 3061da177e4SLinus Torvalds if (s[-1] == ',') 3071da177e4SLinus Torvalds s[-1] = '\0'; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds } else { 3101da177e4SLinus Torvalds int len = get_filesystem_list(page); 3111da177e4SLinus Torvalds char *p, *next; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds page[len] = '\0'; 3141da177e4SLinus Torvalds for (p = page-1; p; p = next) { 3151da177e4SLinus Torvalds next = strchr(++p, '\n'); 3161da177e4SLinus Torvalds if (*p++ != '\t') 3171da177e4SLinus Torvalds continue; 3181da177e4SLinus Torvalds while ((*s++ = *p++) != '\n') 3191da177e4SLinus Torvalds ; 3201da177e4SLinus Torvalds s[-1] = '\0'; 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds *s = '\0'; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds static int __init do_mount_root(char *name, char *fs, int flags, void *data) 3271da177e4SLinus Torvalds { 3281da177e4SLinus Torvalds int err = sys_mount(name, "/root", fs, flags, data); 3291da177e4SLinus Torvalds if (err) 3301da177e4SLinus Torvalds return err; 3311da177e4SLinus Torvalds 332562f5e63SNamhyung Kim sys_chdir((const char __user __force *)"/root"); 3336ac08c39SJan Blunck ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev; 33480cdc6daSMandeep Singh Baines printk(KERN_INFO 33580cdc6daSMandeep Singh Baines "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", 3366ac08c39SJan Blunck current->fs->pwd.mnt->mnt_sb->s_type->name, 3376ac08c39SJan Blunck current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ? 338bca1033bSMarton Balint " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); 3391da177e4SLinus Torvalds return 0; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds void __init mount_block_root(char *name, int flags) 3431da177e4SLinus Torvalds { 3443b5c760eSVegard Nossum char *fs_names = __getname_gfp(GFP_KERNEL 3453b5c760eSVegard Nossum | __GFP_NOTRACK_FALSE_POSITIVE); 3461da177e4SLinus Torvalds char *p; 3479361401eSDavid Howells #ifdef CONFIG_BLOCK 3481da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3499361401eSDavid Howells #else 3509361401eSDavid Howells const char *b = name; 3519361401eSDavid Howells #endif 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds get_fs_names(fs_names); 3541da177e4SLinus Torvalds retry: 3551da177e4SLinus Torvalds for (p = fs_names; *p; p += strlen(p)+1) { 3561da177e4SLinus Torvalds int err = do_mount_root(name, p, flags, root_mount_data); 3571da177e4SLinus Torvalds switch (err) { 3581da177e4SLinus Torvalds case 0: 3591da177e4SLinus Torvalds goto out; 3601da177e4SLinus Torvalds case -EACCES: 3611da177e4SLinus Torvalds flags |= MS_RDONLY; 3621da177e4SLinus Torvalds goto retry; 3631da177e4SLinus Torvalds case -EINVAL: 3641da177e4SLinus Torvalds continue; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds /* 3671da177e4SLinus Torvalds * Allow the user to distinguish between failed sys_open 3681da177e4SLinus Torvalds * and bad superblock on root device. 369dd2a345fSDave Gilbert * and give them a list of the available devices 3701da177e4SLinus Torvalds */ 3719361401eSDavid Howells #ifdef CONFIG_BLOCK 3721da177e4SLinus Torvalds __bdevname(ROOT_DEV, b); 3739361401eSDavid Howells #endif 3741da177e4SLinus Torvalds printk("VFS: Cannot open root device \"%s\" or %s\n", 3751da177e4SLinus Torvalds root_device_name, b); 376dd2a345fSDave Gilbert printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 3771da177e4SLinus Torvalds 378dd2a345fSDave Gilbert printk_all_partitions(); 37955dc7db7STejun Heo #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT 38055dc7db7STejun Heo printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " 38155dc7db7STejun Heo "explicit textual name for \"root=\" boot option.\n"); 38255dc7db7STejun Heo #endif 3831da177e4SLinus Torvalds panic("VFS: Unable to mount root fs on %s", b); 3841da177e4SLinus Torvalds } 385be6e028bSAndy Whitcroft 386dd2a345fSDave Gilbert printk("List of all partitions:\n"); 387dd2a345fSDave Gilbert printk_all_partitions(); 388be6e028bSAndy Whitcroft printk("No filesystem could mount root, tried: "); 389be6e028bSAndy Whitcroft for (p = fs_names; *p; p += strlen(p)+1) 390be6e028bSAndy Whitcroft printk(" %s", p); 391be6e028bSAndy Whitcroft printk("\n"); 3929361401eSDavid Howells #ifdef CONFIG_BLOCK 3939361401eSDavid Howells __bdevname(ROOT_DEV, b); 3949361401eSDavid Howells #endif 3959361401eSDavid Howells panic("VFS: Unable to mount root fs on %s", b); 3961da177e4SLinus Torvalds out: 3971da177e4SLinus Torvalds putname(fs_names); 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 40143717c7dSChuck Lever 40243717c7dSChuck Lever #define NFSROOT_TIMEOUT_MIN 5 40343717c7dSChuck Lever #define NFSROOT_TIMEOUT_MAX 30 40443717c7dSChuck Lever #define NFSROOT_RETRY_MAX 5 40543717c7dSChuck Lever 4061da177e4SLinus Torvalds static int __init mount_nfs_root(void) 4071da177e4SLinus Torvalds { 40856463e50SChuck Lever char *root_dev, *root_data; 40943717c7dSChuck Lever unsigned int timeout; 41043717c7dSChuck Lever int try, err; 4111da177e4SLinus Torvalds 41243717c7dSChuck Lever err = nfs_root_data(&root_dev, &root_data); 41343717c7dSChuck Lever if (err != 0) 4141da177e4SLinus Torvalds return 0; 41543717c7dSChuck Lever 41643717c7dSChuck Lever /* 41743717c7dSChuck Lever * The server or network may not be ready, so try several 41843717c7dSChuck Lever * times. Stop after a few tries in case the client wants 41943717c7dSChuck Lever * to fall back to other boot methods. 42043717c7dSChuck Lever */ 42143717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MIN; 42243717c7dSChuck Lever for (try = 1; ; try++) { 42343717c7dSChuck Lever err = do_mount_root(root_dev, "nfs", 42443717c7dSChuck Lever root_mountflags, root_data); 42543717c7dSChuck Lever if (err == 0) 42656463e50SChuck Lever return 1; 42743717c7dSChuck Lever if (try > NFSROOT_RETRY_MAX) 42843717c7dSChuck Lever break; 42943717c7dSChuck Lever 43043717c7dSChuck Lever /* Wait, in case the server refused us immediately */ 43143717c7dSChuck Lever ssleep(timeout); 43243717c7dSChuck Lever timeout <<= 1; 43343717c7dSChuck Lever if (timeout > NFSROOT_TIMEOUT_MAX) 43443717c7dSChuck Lever timeout = NFSROOT_TIMEOUT_MAX; 43543717c7dSChuck Lever } 43643717c7dSChuck Lever return 0; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds #endif 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 4411da177e4SLinus Torvalds void __init change_floppy(char *fmt, ...) 4421da177e4SLinus Torvalds { 4431da177e4SLinus Torvalds struct termios termios; 4441da177e4SLinus Torvalds char buf[80]; 4451da177e4SLinus Torvalds char c; 4461da177e4SLinus Torvalds int fd; 4471da177e4SLinus Torvalds va_list args; 4481da177e4SLinus Torvalds va_start(args, fmt); 4491da177e4SLinus Torvalds vsprintf(buf, fmt, args); 4501da177e4SLinus Torvalds va_end(args); 4511da177e4SLinus Torvalds fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 4521da177e4SLinus Torvalds if (fd >= 0) { 4531da177e4SLinus Torvalds sys_ioctl(fd, FDEJECT, 0); 4541da177e4SLinus Torvalds sys_close(fd); 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 4571da177e4SLinus Torvalds fd = sys_open("/dev/console", O_RDWR, 0); 4581da177e4SLinus Torvalds if (fd >= 0) { 4591da177e4SLinus Torvalds sys_ioctl(fd, TCGETS, (long)&termios); 4601da177e4SLinus Torvalds termios.c_lflag &= ~ICANON; 4611da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 4621da177e4SLinus Torvalds sys_read(fd, &c, 1); 4631da177e4SLinus Torvalds termios.c_lflag |= ICANON; 4641da177e4SLinus Torvalds sys_ioctl(fd, TCSETSF, (long)&termios); 4651da177e4SLinus Torvalds sys_close(fd); 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds #endif 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds void __init mount_root(void) 4711da177e4SLinus Torvalds { 4721da177e4SLinus Torvalds #ifdef CONFIG_ROOT_NFS 4731da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { 4741da177e4SLinus Torvalds if (mount_nfs_root()) 4751da177e4SLinus Torvalds return; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 4781da177e4SLinus Torvalds ROOT_DEV = Root_FD0; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds #endif 4811da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_FD 4821da177e4SLinus Torvalds if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 4831da177e4SLinus Torvalds /* rd_doload is 2 for a dual initrd/ramload setup */ 4841da177e4SLinus Torvalds if (rd_doload==2) { 4851da177e4SLinus Torvalds if (rd_load_disk(1)) { 4861da177e4SLinus Torvalds ROOT_DEV = Root_RAM1; 4871da177e4SLinus Torvalds root_device_name = NULL; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds } else 4901da177e4SLinus Torvalds change_floppy("root floppy"); 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds #endif 4939361401eSDavid Howells #ifdef CONFIG_BLOCK 494bdaf8529SGreg Kroah-Hartman create_dev("/dev/root", ROOT_DEV); 4951da177e4SLinus Torvalds mount_block_root("/dev/root", root_mountflags); 4969361401eSDavid Howells #endif 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* 5001da177e4SLinus Torvalds * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 5011da177e4SLinus Torvalds */ 5021da177e4SLinus Torvalds void __init prepare_namespace(void) 5031da177e4SLinus Torvalds { 5041da177e4SLinus Torvalds int is_floppy; 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds if (root_delay) { 5071da177e4SLinus Torvalds printk(KERN_INFO "Waiting %dsec before mounting root device...\n", 5081da177e4SLinus Torvalds root_delay); 5091da177e4SLinus Torvalds ssleep(root_delay); 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 512216773a7SArjan van de Ven /* 513216773a7SArjan van de Ven * wait for the known devices to complete their probing 514216773a7SArjan van de Ven * 515216773a7SArjan van de Ven * Note: this is a potential source of long boot delays. 516216773a7SArjan van de Ven * For example, it is not atypical to wait 5 seconds here 517216773a7SArjan van de Ven * for the touchpad of a laptop to initialize. 518216773a7SArjan van de Ven */ 519216773a7SArjan van de Ven wait_for_device_probe(); 520d779249eSGreg Kroah-Hartman 5211da177e4SLinus Torvalds md_run_setup(); 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds if (saved_root_name[0]) { 5241da177e4SLinus Torvalds root_device_name = saved_root_name; 5252d62f488SAdrian Hunter if (!strncmp(root_device_name, "mtd", 3) || 5262d62f488SAdrian Hunter !strncmp(root_device_name, "ubi", 3)) { 527e9482b43SJoern Engel mount_block_root(root_device_name, root_mountflags); 528e9482b43SJoern Engel goto out; 529e9482b43SJoern Engel } 5301da177e4SLinus Torvalds ROOT_DEV = name_to_dev_t(root_device_name); 5311da177e4SLinus Torvalds if (strncmp(root_device_name, "/dev/", 5) == 0) 5321da177e4SLinus Torvalds root_device_name += 5; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds if (initrd_load()) 5361da177e4SLinus Torvalds goto out; 5371da177e4SLinus Torvalds 538cc1ed754SPierre Ossman /* wait for any asynchronous scanning to complete */ 539cc1ed754SPierre Ossman if ((ROOT_DEV == 0) && root_wait) { 540cc1ed754SPierre Ossman printk(KERN_INFO "Waiting for root device %s...\n", 541cc1ed754SPierre Ossman saved_root_name); 542cc1ed754SPierre Ossman while (driver_probe_done() != 0 || 543cc1ed754SPierre Ossman (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 544cc1ed754SPierre Ossman msleep(100); 545216773a7SArjan van de Ven async_synchronize_full(); 546cc1ed754SPierre Ossman } 547cc1ed754SPierre Ossman 548cc1ed754SPierre Ossman is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 549cc1ed754SPierre Ossman 5501da177e4SLinus Torvalds if (is_floppy && rd_doload && rd_load_disk(0)) 5511da177e4SLinus Torvalds ROOT_DEV = Root_RAM0; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds mount_root(); 5541da177e4SLinus Torvalds out: 5552b2af54aSKay Sievers devtmpfs_mount("dev"); 5561da177e4SLinus Torvalds sys_mount(".", "/", NULL, MS_MOVE, NULL); 557562f5e63SNamhyung Kim sys_chroot((const char __user __force *)"."); 5581da177e4SLinus Torvalds } 559