| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | #include <linux/module.h> |
| 3 | #include <linux/sched.h> |
| 4 | #include <linux/ctype.h> |
| 5 | #include <linux/fd.h> |
| 6 | #include <linux/tty.h> |
| 7 | #include <linux/suspend.h> |
| 8 | #include <linux/root_dev.h> |
| 9 | #include <linux/security.h> |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/mount.h> |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/initrd.h> |
| 16 | #include <linux/async.h> |
| 17 | #include <linux/fs_struct.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/ramfs.h> |
| 20 | #include <linux/shmem_fs.h> |
| 21 | |
| 22 | #include <linux/nfs_fs.h> |
| 23 | #include <linux/nfs_fs_sb.h> |
| 24 | #include <linux/nfs_mount.h> |
| 25 | #include <linux/raid/detect.h> |
| 26 | #include <uapi/linux/mount.h> |
| 27 | |
| 28 | #include "do_mounts.h" |
| 29 | |
| 30 | int root_mountflags = MS_RDONLY | MS_SILENT; |
| 31 | static char * __initdata root_device_name; |
| 32 | static char __initdata saved_root_name[64]; |
| 33 | static int root_wait; |
| 34 | |
| 35 | dev_t ROOT_DEV; |
| 36 | |
| 37 | static int __init load_ramdisk(char *str) |
| 38 | { |
| 39 | pr_warn("ignoring the deprecated load_ramdisk= option\n"); |
| 40 | return 1; |
| 41 | } |
| 42 | __setup("load_ramdisk=", load_ramdisk); |
| 43 | |
| 44 | static int __init readonly(char *str) |
| 45 | { |
| 46 | if (*str) |
| 47 | return 0; |
| 48 | root_mountflags |= MS_RDONLY; |
| 49 | return 1; |
| 50 | } |
| 51 | |
| 52 | static int __init readwrite(char *str) |
| 53 | { |
| 54 | if (*str) |
| 55 | return 0; |
| 56 | root_mountflags &= ~MS_RDONLY; |
| 57 | return 1; |
| 58 | } |
| 59 | |
| 60 | __setup("ro", readonly); |
| 61 | __setup("rw", readwrite); |
| 62 | |
| 63 | #ifdef CONFIG_BLOCK |
| 64 | struct uuidcmp { |
| 65 | const char *uuid; |
| 66 | int len; |
| 67 | }; |
| 68 | |
| 69 | /** |
| 70 | * match_dev_by_uuid - callback for finding a partition using its uuid |
| 71 | * @dev: device passed in by the caller |
| 72 | * @data: opaque pointer to the desired struct uuidcmp to match |
| 73 | * |
| 74 | * Returns 1 if the device matches, and 0 otherwise. |
| 75 | */ |
| 76 | static int match_dev_by_uuid(struct device *dev, const void *data) |
| 77 | { |
| 78 | struct block_device *bdev = dev_to_bdev(dev); |
| 79 | const struct uuidcmp *cmp = data; |
| 80 | |
| 81 | if (!bdev->bd_meta_info || |
| 82 | strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) |
| 83 | return 0; |
| 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID |
| 89 | * @uuid_str: char array containing ascii UUID |
| 90 | * |
| 91 | * The function will return the first partition which contains a matching |
| 92 | * UUID value in its partition_meta_info struct. This does not search |
| 93 | * by filesystem UUIDs. |
| 94 | * |
| 95 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
| 96 | * extracted and used as an offset from the partition identified by the UUID. |
| 97 | * |
| 98 | * Returns the matching dev_t on success or 0 on failure. |
| 99 | */ |
| 100 | static dev_t devt_from_partuuid(const char *uuid_str) |
| 101 | { |
| 102 | struct uuidcmp cmp; |
| 103 | struct device *dev = NULL; |
| 104 | dev_t devt = 0; |
| 105 | int offset = 0; |
| 106 | char *slash; |
| 107 | |
| 108 | cmp.uuid = uuid_str; |
| 109 | |
| 110 | slash = strchr(uuid_str, '/'); |
| 111 | /* Check for optional partition number offset attributes. */ |
| 112 | if (slash) { |
| 113 | char c = 0; |
| 114 | |
| 115 | /* Explicitly fail on poor PARTUUID syntax. */ |
| 116 | if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) |
| 117 | goto clear_root_wait; |
| 118 | cmp.len = slash - uuid_str; |
| 119 | } else { |
| 120 | cmp.len = strlen(uuid_str); |
| 121 | } |
| 122 | |
| 123 | if (!cmp.len) |
| 124 | goto clear_root_wait; |
| 125 | |
| 126 | dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); |
| 127 | if (!dev) |
| 128 | return 0; |
| 129 | |
| 130 | if (offset) { |
| 131 | /* |
| 132 | * Attempt to find the requested partition by adding an offset |
| 133 | * to the partition number found by UUID. |
| 134 | */ |
| 135 | devt = part_devt(dev_to_disk(dev), |
| 136 | dev_to_bdev(dev)->bd_partno + offset); |
| 137 | } else { |
| 138 | devt = dev->devt; |
| 139 | } |
| 140 | |
| 141 | put_device(dev); |
| 142 | return devt; |
| 143 | |
| 144 | clear_root_wait: |
| 145 | pr_err("VFS: PARTUUID= is invalid.\n" |
| 146 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); |
| 147 | if (root_wait) |
| 148 | pr_err("Disabling rootwait; root= is invalid.\n"); |
| 149 | root_wait = 0; |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * match_dev_by_label - callback for finding a partition using its label |
| 155 | * @dev: device passed in by the caller |
| 156 | * @data: opaque pointer to the label to match |
| 157 | * |
| 158 | * Returns 1 if the device matches, and 0 otherwise. |
| 159 | */ |
| 160 | static int match_dev_by_label(struct device *dev, const void *data) |
| 161 | { |
| 162 | struct block_device *bdev = dev_to_bdev(dev); |
| 163 | const char *label = data; |
| 164 | |
| 165 | if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) |
| 166 | return 0; |
| 167 | return 1; |
| 168 | } |
| 169 | |
| 170 | static dev_t devt_from_partlabel(const char *label) |
| 171 | { |
| 172 | struct device *dev; |
| 173 | dev_t devt = 0; |
| 174 | |
| 175 | dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); |
| 176 | if (dev) { |
| 177 | devt = dev->devt; |
| 178 | put_device(dev); |
| 179 | } |
| 180 | |
| 181 | return devt; |
| 182 | } |
| 183 | |
| 184 | static dev_t devt_from_devname(const char *name) |
| 185 | { |
| 186 | dev_t devt = 0; |
| 187 | int part; |
| 188 | char s[32]; |
| 189 | char *p; |
| 190 | |
| 191 | if (strlen(name) > 31) |
| 192 | return 0; |
| 193 | strcpy(s, name); |
| 194 | for (p = s; *p; p++) { |
| 195 | if (*p == '/') |
| 196 | *p = '!'; |
| 197 | } |
| 198 | |
| 199 | devt = blk_lookup_devt(s, 0); |
| 200 | if (devt) |
| 201 | return devt; |
| 202 | |
| 203 | /* |
| 204 | * Try non-existent, but valid partition, which may only exist after |
| 205 | * opening the device, like partitioned md devices. |
| 206 | */ |
| 207 | while (p > s && isdigit(p[-1])) |
| 208 | p--; |
| 209 | if (p == s || !*p || *p == '0') |
| 210 | return 0; |
| 211 | |
| 212 | /* try disk name without <part number> */ |
| 213 | part = simple_strtoul(p, NULL, 10); |
| 214 | *p = '\0'; |
| 215 | devt = blk_lookup_devt(s, part); |
| 216 | if (devt) |
| 217 | return devt; |
| 218 | |
| 219 | /* try disk name without p<part number> */ |
| 220 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') |
| 221 | return 0; |
| 222 | p[-1] = '\0'; |
| 223 | return blk_lookup_devt(s, part); |
| 224 | } |
| 225 | #endif /* CONFIG_BLOCK */ |
| 226 | |
| 227 | static dev_t devt_from_devnum(const char *name) |
| 228 | { |
| 229 | unsigned maj, min, offset; |
| 230 | dev_t devt = 0; |
| 231 | char *p, dummy; |
| 232 | |
| 233 | if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || |
| 234 | sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { |
| 235 | devt = MKDEV(maj, min); |
| 236 | if (maj != MAJOR(devt) || min != MINOR(devt)) |
| 237 | return 0; |
| 238 | } else { |
| 239 | devt = new_decode_dev(simple_strtoul(name, &p, 16)); |
| 240 | if (*p) |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | return devt; |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Convert a name into device number. We accept the following variants: |
| 249 | * |
| 250 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
| 251 | * no leading 0x, for example b302. |
| 252 | * 2) /dev/nfs represents Root_NFS (0xff) |
| 253 | * 3) /dev/<disk_name> represents the device number of disk |
| 254 | * 4) /dev/<disk_name><decimal> represents the device number |
| 255 | * of partition - device number of disk plus the partition number |
| 256 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is |
| 257 | * used when disk name of partitioned disk ends on a digit. |
| 258 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
| 259 | * unique id of a partition if the partition table provides it. |
| 260 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
| 261 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- |
| 262 | * filled hex representation of the 32-bit "NT disk signature", and PP |
| 263 | * is a zero-filled hex representation of the 1-based partition number. |
| 264 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
| 265 | * a partition with a known unique id. |
| 266 | * 8) <major>:<minor> major and minor number of the device separated by |
| 267 | * a colon. |
| 268 | * 9) PARTLABEL=<name> with name being the GPT partition label. |
| 269 | * MSDOS partitions do not support labels! |
| 270 | * 10) /dev/cifs represents Root_CIFS (0xfe) |
| 271 | * |
| 272 | * If name doesn't have fall into the categories above, we return (0,0). |
| 273 | * block_class is used to check if something is a disk name. If the disk |
| 274 | * name contains slashes, the device name has them replaced with |
| 275 | * bangs. |
| 276 | */ |
| 277 | dev_t name_to_dev_t(const char *name) |
| 278 | { |
| 279 | if (strcmp(name, "/dev/nfs") == 0) |
| 280 | return Root_NFS; |
| 281 | if (strcmp(name, "/dev/cifs") == 0) |
| 282 | return Root_CIFS; |
| 283 | if (strcmp(name, "/dev/ram") == 0) |
| 284 | return Root_RAM0; |
| 285 | #ifdef CONFIG_BLOCK |
| 286 | if (strncmp(name, "PARTUUID=", 9) == 0) |
| 287 | return devt_from_partuuid(name + 9); |
| 288 | if (strncmp(name, "PARTLABEL=", 10) == 0) |
| 289 | return devt_from_partlabel(name + 10); |
| 290 | if (strncmp(name, "/dev/", 5) == 0) |
| 291 | return devt_from_devname(name + 5); |
| 292 | #endif |
| 293 | return devt_from_devnum(name); |
| 294 | } |
| 295 | EXPORT_SYMBOL_GPL(name_to_dev_t); |
| 296 | |
| 297 | static int __init root_dev_setup(char *line) |
| 298 | { |
| 299 | strscpy(saved_root_name, line, sizeof(saved_root_name)); |
| 300 | return 1; |
| 301 | } |
| 302 | |
| 303 | __setup("root=", root_dev_setup); |
| 304 | |
| 305 | static int __init rootwait_setup(char *str) |
| 306 | { |
| 307 | if (*str) |
| 308 | return 0; |
| 309 | root_wait = 1; |
| 310 | return 1; |
| 311 | } |
| 312 | |
| 313 | __setup("rootwait", rootwait_setup); |
| 314 | |
| 315 | static char * __initdata root_mount_data; |
| 316 | static int __init root_data_setup(char *str) |
| 317 | { |
| 318 | root_mount_data = str; |
| 319 | return 1; |
| 320 | } |
| 321 | |
| 322 | static char * __initdata root_fs_names; |
| 323 | static int __init fs_names_setup(char *str) |
| 324 | { |
| 325 | root_fs_names = str; |
| 326 | return 1; |
| 327 | } |
| 328 | |
| 329 | static unsigned int __initdata root_delay; |
| 330 | static int __init root_delay_setup(char *str) |
| 331 | { |
| 332 | root_delay = simple_strtoul(str, NULL, 0); |
| 333 | return 1; |
| 334 | } |
| 335 | |
| 336 | __setup("rootflags=", root_data_setup); |
| 337 | __setup("rootfstype=", fs_names_setup); |
| 338 | __setup("rootdelay=", root_delay_setup); |
| 339 | |
| 340 | /* This can return zero length strings. Caller should check */ |
| 341 | static int __init split_fs_names(char *page, size_t size, char *names) |
| 342 | { |
| 343 | int count = 1; |
| 344 | char *p = page; |
| 345 | |
| 346 | strscpy(p, root_fs_names, size); |
| 347 | while (*p++) { |
| 348 | if (p[-1] == ',') { |
| 349 | p[-1] = '\0'; |
| 350 | count++; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | return count; |
| 355 | } |
| 356 | |
| 357 | static int __init do_mount_root(const char *name, const char *fs, |
| 358 | const int flags, const void *data) |
| 359 | { |
| 360 | struct super_block *s; |
| 361 | struct page *p = NULL; |
| 362 | char *data_page = NULL; |
| 363 | int ret; |
| 364 | |
| 365 | if (data) { |
| 366 | /* init_mount() requires a full page as fifth argument */ |
| 367 | p = alloc_page(GFP_KERNEL); |
| 368 | if (!p) |
| 369 | return -ENOMEM; |
| 370 | data_page = page_address(p); |
| 371 | /* zero-pad. init_mount() will make sure it's terminated */ |
| 372 | strncpy(data_page, data, PAGE_SIZE); |
| 373 | } |
| 374 | |
| 375 | ret = init_mount(name, "/root", fs, flags, data_page); |
| 376 | if (ret) |
| 377 | goto out; |
| 378 | |
| 379 | init_chdir("/root"); |
| 380 | s = current->fs->pwd.dentry->d_sb; |
| 381 | ROOT_DEV = s->s_dev; |
| 382 | printk(KERN_INFO |
| 383 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", |
| 384 | s->s_type->name, |
| 385 | sb_rdonly(s) ? " readonly" : "", |
| 386 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
| 387 | |
| 388 | out: |
| 389 | if (p) |
| 390 | put_page(p); |
| 391 | return ret; |
| 392 | } |
| 393 | |
| 394 | void __init mount_block_root(char *name, int flags) |
| 395 | { |
| 396 | struct page *page = alloc_page(GFP_KERNEL); |
| 397 | char *fs_names = page_address(page); |
| 398 | char *p; |
| 399 | char b[BDEVNAME_SIZE]; |
| 400 | int num_fs, i; |
| 401 | |
| 402 | scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)", |
| 403 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
| 404 | if (root_fs_names) |
| 405 | num_fs = split_fs_names(fs_names, PAGE_SIZE, root_fs_names); |
| 406 | else |
| 407 | num_fs = list_bdev_fs_names(fs_names, PAGE_SIZE); |
| 408 | retry: |
| 409 | for (i = 0, p = fs_names; i < num_fs; i++, p += strlen(p)+1) { |
| 410 | int err; |
| 411 | |
| 412 | if (!*p) |
| 413 | continue; |
| 414 | err = do_mount_root(name, p, flags, root_mount_data); |
| 415 | switch (err) { |
| 416 | case 0: |
| 417 | goto out; |
| 418 | case -EACCES: |
| 419 | case -EINVAL: |
| 420 | continue; |
| 421 | } |
| 422 | /* |
| 423 | * Allow the user to distinguish between failed sys_open |
| 424 | * and bad superblock on root device. |
| 425 | * and give them a list of the available devices |
| 426 | */ |
| 427 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
| 428 | root_device_name, b, err); |
| 429 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
| 430 | |
| 431 | printk_all_partitions(); |
| 432 | panic("VFS: Unable to mount root fs on %s", b); |
| 433 | } |
| 434 | if (!(flags & SB_RDONLY)) { |
| 435 | flags |= SB_RDONLY; |
| 436 | goto retry; |
| 437 | } |
| 438 | |
| 439 | printk("List of all partitions:\n"); |
| 440 | printk_all_partitions(); |
| 441 | printk("No filesystem could mount root, tried: "); |
| 442 | for (i = 0, p = fs_names; i < num_fs; i++, p += strlen(p)+1) |
| 443 | printk(" %s", p); |
| 444 | printk("\n"); |
| 445 | panic("VFS: Unable to mount root fs on %s", b); |
| 446 | out: |
| 447 | put_page(page); |
| 448 | } |
| 449 | |
| 450 | #ifdef CONFIG_ROOT_NFS |
| 451 | |
| 452 | #define NFSROOT_TIMEOUT_MIN 5 |
| 453 | #define NFSROOT_TIMEOUT_MAX 30 |
| 454 | #define NFSROOT_RETRY_MAX 5 |
| 455 | |
| 456 | static int __init mount_nfs_root(void) |
| 457 | { |
| 458 | char *root_dev, *root_data; |
| 459 | unsigned int timeout; |
| 460 | int try, err; |
| 461 | |
| 462 | err = nfs_root_data(&root_dev, &root_data); |
| 463 | if (err != 0) |
| 464 | return 0; |
| 465 | |
| 466 | /* |
| 467 | * The server or network may not be ready, so try several |
| 468 | * times. Stop after a few tries in case the client wants |
| 469 | * to fall back to other boot methods. |
| 470 | */ |
| 471 | timeout = NFSROOT_TIMEOUT_MIN; |
| 472 | for (try = 1; ; try++) { |
| 473 | err = do_mount_root(root_dev, "nfs", |
| 474 | root_mountflags, root_data); |
| 475 | if (err == 0) |
| 476 | return 1; |
| 477 | if (try > NFSROOT_RETRY_MAX) |
| 478 | break; |
| 479 | |
| 480 | /* Wait, in case the server refused us immediately */ |
| 481 | ssleep(timeout); |
| 482 | timeout <<= 1; |
| 483 | if (timeout > NFSROOT_TIMEOUT_MAX) |
| 484 | timeout = NFSROOT_TIMEOUT_MAX; |
| 485 | } |
| 486 | return 0; |
| 487 | } |
| 488 | #endif |
| 489 | |
| 490 | #ifdef CONFIG_CIFS_ROOT |
| 491 | |
| 492 | extern int cifs_root_data(char **dev, char **opts); |
| 493 | |
| 494 | #define CIFSROOT_TIMEOUT_MIN 5 |
| 495 | #define CIFSROOT_TIMEOUT_MAX 30 |
| 496 | #define CIFSROOT_RETRY_MAX 5 |
| 497 | |
| 498 | static int __init mount_cifs_root(void) |
| 499 | { |
| 500 | char *root_dev, *root_data; |
| 501 | unsigned int timeout; |
| 502 | int try, err; |
| 503 | |
| 504 | err = cifs_root_data(&root_dev, &root_data); |
| 505 | if (err != 0) |
| 506 | return 0; |
| 507 | |
| 508 | timeout = CIFSROOT_TIMEOUT_MIN; |
| 509 | for (try = 1; ; try++) { |
| 510 | err = do_mount_root(root_dev, "cifs", root_mountflags, |
| 511 | root_data); |
| 512 | if (err == 0) |
| 513 | return 1; |
| 514 | if (try > CIFSROOT_RETRY_MAX) |
| 515 | break; |
| 516 | |
| 517 | ssleep(timeout); |
| 518 | timeout <<= 1; |
| 519 | if (timeout > CIFSROOT_TIMEOUT_MAX) |
| 520 | timeout = CIFSROOT_TIMEOUT_MAX; |
| 521 | } |
| 522 | return 0; |
| 523 | } |
| 524 | #endif |
| 525 | |
| 526 | static bool __init fs_is_nodev(char *fstype) |
| 527 | { |
| 528 | struct file_system_type *fs = get_fs_type(fstype); |
| 529 | bool ret = false; |
| 530 | |
| 531 | if (fs) { |
| 532 | ret = !(fs->fs_flags & FS_REQUIRES_DEV); |
| 533 | put_filesystem(fs); |
| 534 | } |
| 535 | |
| 536 | return ret; |
| 537 | } |
| 538 | |
| 539 | static int __init mount_nodev_root(void) |
| 540 | { |
| 541 | char *fs_names, *fstype; |
| 542 | int err = -EINVAL; |
| 543 | int num_fs, i; |
| 544 | |
| 545 | fs_names = (void *)__get_free_page(GFP_KERNEL); |
| 546 | if (!fs_names) |
| 547 | return -EINVAL; |
| 548 | num_fs = split_fs_names(fs_names, PAGE_SIZE, root_fs_names); |
| 549 | |
| 550 | for (i = 0, fstype = fs_names; i < num_fs; |
| 551 | i++, fstype += strlen(fstype) + 1) { |
| 552 | if (!*fstype) |
| 553 | continue; |
| 554 | if (!fs_is_nodev(fstype)) |
| 555 | continue; |
| 556 | err = do_mount_root(root_device_name, fstype, root_mountflags, |
| 557 | root_mount_data); |
| 558 | if (!err) |
| 559 | break; |
| 560 | } |
| 561 | |
| 562 | free_page((unsigned long)fs_names); |
| 563 | return err; |
| 564 | } |
| 565 | |
| 566 | void __init mount_root(void) |
| 567 | { |
| 568 | #ifdef CONFIG_ROOT_NFS |
| 569 | if (ROOT_DEV == Root_NFS) { |
| 570 | if (!mount_nfs_root()) |
| 571 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS.\n"); |
| 572 | return; |
| 573 | } |
| 574 | #endif |
| 575 | #ifdef CONFIG_CIFS_ROOT |
| 576 | if (ROOT_DEV == Root_CIFS) { |
| 577 | if (!mount_cifs_root()) |
| 578 | printk(KERN_ERR "VFS: Unable to mount root fs via SMB.\n"); |
| 579 | return; |
| 580 | } |
| 581 | #endif |
| 582 | if (ROOT_DEV == 0 && root_device_name && root_fs_names) { |
| 583 | if (mount_nodev_root() == 0) |
| 584 | return; |
| 585 | } |
| 586 | #ifdef CONFIG_BLOCK |
| 587 | { |
| 588 | int err = create_dev("/dev/root", ROOT_DEV); |
| 589 | |
| 590 | if (err < 0) |
| 591 | pr_emerg("Failed to create /dev/root: %d\n", err); |
| 592 | mount_block_root("/dev/root", root_mountflags); |
| 593 | } |
| 594 | #endif |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. |
| 599 | */ |
| 600 | void __init prepare_namespace(void) |
| 601 | { |
| 602 | if (root_delay) { |
| 603 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
| 604 | root_delay); |
| 605 | ssleep(root_delay); |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * wait for the known devices to complete their probing |
| 610 | * |
| 611 | * Note: this is a potential source of long boot delays. |
| 612 | * For example, it is not atypical to wait 5 seconds here |
| 613 | * for the touchpad of a laptop to initialize. |
| 614 | */ |
| 615 | wait_for_device_probe(); |
| 616 | |
| 617 | md_run_setup(); |
| 618 | |
| 619 | if (saved_root_name[0]) { |
| 620 | root_device_name = saved_root_name; |
| 621 | if (!strncmp(root_device_name, "mtd", 3) || |
| 622 | !strncmp(root_device_name, "ubi", 3)) { |
| 623 | mount_block_root(root_device_name, root_mountflags); |
| 624 | goto out; |
| 625 | } |
| 626 | ROOT_DEV = name_to_dev_t(root_device_name); |
| 627 | if (strncmp(root_device_name, "/dev/", 5) == 0) |
| 628 | root_device_name += 5; |
| 629 | } |
| 630 | |
| 631 | if (initrd_load()) |
| 632 | goto out; |
| 633 | |
| 634 | /* wait for any asynchronous scanning to complete */ |
| 635 | if ((ROOT_DEV == 0) && root_wait) { |
| 636 | printk(KERN_INFO "Waiting for root device %s...\n", |
| 637 | saved_root_name); |
| 638 | while (driver_probe_done() != 0 || |
| 639 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) |
| 640 | msleep(5); |
| 641 | async_synchronize_full(); |
| 642 | } |
| 643 | |
| 644 | mount_root(); |
| 645 | out: |
| 646 | devtmpfs_mount(); |
| 647 | init_mount(".", "/", NULL, MS_MOVE, NULL); |
| 648 | init_chroot("."); |
| 649 | } |
| 650 | |
| 651 | static bool is_tmpfs; |
| 652 | static int rootfs_init_fs_context(struct fs_context *fc) |
| 653 | { |
| 654 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
| 655 | return shmem_init_fs_context(fc); |
| 656 | |
| 657 | return ramfs_init_fs_context(fc); |
| 658 | } |
| 659 | |
| 660 | struct file_system_type rootfs_fs_type = { |
| 661 | .name = "rootfs", |
| 662 | .init_fs_context = rootfs_init_fs_context, |
| 663 | .kill_sb = kill_litter_super, |
| 664 | }; |
| 665 | |
| 666 | void __init init_rootfs(void) |
| 667 | { |
| 668 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
| 669 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) |
| 670 | is_tmpfs = true; |
| 671 | } |