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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
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> | |
dd2a345f | 11 | #include <linux/genhd.h> |
d53d9f16 | 12 | #include <linux/mount.h> |
d779249e | 13 | #include <linux/device.h> |
46595390 | 14 | #include <linux/init.h> |
011e3fcd | 15 | #include <linux/fs.h> |
82c8253a | 16 | #include <linux/initrd.h> |
22a9d645 | 17 | #include <linux/async.h> |
5ad4e53b | 18 | #include <linux/fs_struct.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
57f150a5 | 20 | #include <linux/ramfs.h> |
16203a7a | 21 | #include <linux/shmem_fs.h> |
1da177e4 LT |
22 | |
23 | #include <linux/nfs_fs.h> | |
24 | #include <linux/nfs_fs_sb.h> | |
25 | #include <linux/nfs_mount.h> | |
4f5b246b | 26 | #include <linux/raid/detect.h> |
e262e32d | 27 | #include <uapi/linux/mount.h> |
1da177e4 LT |
28 | |
29 | #include "do_mounts.h" | |
30 | ||
9b04c997 | 31 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 32 | static char * __initdata root_device_name; |
1da177e4 | 33 | static char __initdata saved_root_name[64]; |
79975f13 | 34 | static int root_wait; |
1da177e4 | 35 | |
1da177e4 LT |
36 | dev_t ROOT_DEV; |
37 | ||
1da177e4 LT |
38 | static int __init load_ramdisk(char *str) |
39 | { | |
c8376994 | 40 | pr_warn("ignoring the deprecated load_ramdisk= option\n"); |
1da177e4 LT |
41 | return 1; |
42 | } | |
43 | __setup("load_ramdisk=", load_ramdisk); | |
44 | ||
45 | static int __init readonly(char *str) | |
46 | { | |
47 | if (*str) | |
48 | return 0; | |
49 | root_mountflags |= MS_RDONLY; | |
50 | return 1; | |
51 | } | |
52 | ||
53 | static int __init readwrite(char *str) | |
54 | { | |
55 | if (*str) | |
56 | return 0; | |
57 | root_mountflags &= ~MS_RDONLY; | |
58 | return 1; | |
59 | } | |
60 | ||
61 | __setup("ro", readonly); | |
62 | __setup("rw", readwrite); | |
63 | ||
6d0aed7a | 64 | #ifdef CONFIG_BLOCK |
1ad7e899 SW |
65 | struct uuidcmp { |
66 | const char *uuid; | |
67 | int len; | |
68 | }; | |
69 | ||
b5af921e WD |
70 | /** |
71 | * match_dev_by_uuid - callback for finding a partition using its uuid | |
72 | * @dev: device passed in by the caller | |
1ad7e899 | 73 | * @data: opaque pointer to the desired struct uuidcmp to match |
b5af921e WD |
74 | * |
75 | * Returns 1 if the device matches, and 0 otherwise. | |
76 | */ | |
9f3b795a | 77 | static int match_dev_by_uuid(struct device *dev, const void *data) |
b5af921e | 78 | { |
0d02129e | 79 | struct block_device *bdev = dev_to_bdev(dev); |
9f3b795a | 80 | const struct uuidcmp *cmp = data; |
b5af921e | 81 | |
0d02129e CH |
82 | if (!bdev->bd_meta_info || |
83 | strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) | |
013b0e96 | 84 | return 0; |
b5af921e | 85 | return 1; |
b5af921e WD |
86 | } |
87 | ||
b5af921e WD |
88 | /** |
89 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | |
a68b3108 | 90 | * @uuid_str: char array containing ascii UUID |
b5af921e WD |
91 | * |
92 | * The function will return the first partition which contains a matching | |
93 | * UUID value in its partition_meta_info struct. This does not search | |
94 | * by filesystem UUIDs. | |
95 | * | |
a68b3108 | 96 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
79975f13 WD |
97 | * extracted and used as an offset from the partition identified by the UUID. |
98 | * | |
b5af921e WD |
99 | * Returns the matching dev_t on success or 0 on failure. |
100 | */ | |
1ad7e899 | 101 | static dev_t devt_from_partuuid(const char *uuid_str) |
b5af921e | 102 | { |
1ad7e899 | 103 | struct uuidcmp cmp; |
b5af921e | 104 | struct device *dev = NULL; |
e036bb8e | 105 | dev_t devt = 0; |
79975f13 | 106 | int offset = 0; |
283f8fc0 | 107 | char *slash; |
79975f13 | 108 | |
1ad7e899 | 109 | cmp.uuid = uuid_str; |
1ad7e899 | 110 | |
283f8fc0 | 111 | slash = strchr(uuid_str, '/'); |
79975f13 | 112 | /* Check for optional partition number offset attributes. */ |
283f8fc0 | 113 | if (slash) { |
79975f13 | 114 | char c = 0; |
e036bb8e | 115 | |
79975f13 | 116 | /* Explicitly fail on poor PARTUUID syntax. */ |
e036bb8e CH |
117 | if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) |
118 | goto clear_root_wait; | |
283f8fc0 SW |
119 | cmp.len = slash - uuid_str; |
120 | } else { | |
121 | cmp.len = strlen(uuid_str); | |
122 | } | |
123 | ||
e036bb8e CH |
124 | if (!cmp.len) |
125 | goto clear_root_wait; | |
b5af921e | 126 | |
e036bb8e | 127 | dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); |
b5af921e | 128 | if (!dev) |
e036bb8e | 129 | return 0; |
79975f13 | 130 | |
e036bb8e CH |
131 | if (offset) { |
132 | /* | |
133 | * Attempt to find the requested partition by adding an offset | |
134 | * to the partition number found by UUID. | |
135 | */ | |
c97d93c3 CH |
136 | devt = part_devt(dev_to_disk(dev), |
137 | dev_to_bdev(dev)->bd_partno + offset); | |
e036bb8e CH |
138 | } else { |
139 | devt = dev->devt; | |
79975f13 WD |
140 | } |
141 | ||
79975f13 | 142 | put_device(dev); |
e036bb8e CH |
143 | return devt; |
144 | ||
145 | clear_root_wait: | |
146 | pr_err("VFS: PARTUUID= is invalid.\n" | |
147 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); | |
148 | if (root_wait) | |
149 | pr_err("Disabling rootwait; root= is invalid.\n"); | |
150 | root_wait = 0; | |
151 | return 0; | |
b5af921e | 152 | } |
f027c34d NV |
153 | |
154 | /** | |
155 | * match_dev_by_label - callback for finding a partition using its label | |
156 | * @dev: device passed in by the caller | |
157 | * @data: opaque pointer to the label to match | |
158 | * | |
159 | * Returns 1 if the device matches, and 0 otherwise. | |
160 | */ | |
161 | static int match_dev_by_label(struct device *dev, const void *data) | |
162 | { | |
0d02129e | 163 | struct block_device *bdev = dev_to_bdev(dev); |
f027c34d | 164 | const char *label = data; |
f027c34d | 165 | |
0d02129e | 166 | if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) |
013b0e96 CH |
167 | return 0; |
168 | return 1; | |
f027c34d | 169 | } |
c2637e80 CH |
170 | |
171 | static dev_t devt_from_partlabel(const char *label) | |
172 | { | |
173 | struct device *dev; | |
174 | dev_t devt = 0; | |
175 | ||
176 | dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); | |
177 | if (dev) { | |
178 | devt = dev->devt; | |
179 | put_device(dev); | |
180 | } | |
181 | ||
182 | return devt; | |
183 | } | |
184 | ||
185 | static dev_t devt_from_devname(const char *name) | |
186 | { | |
187 | dev_t devt = 0; | |
188 | int part; | |
189 | char s[32]; | |
190 | char *p; | |
191 | ||
192 | if (strlen(name) > 31) | |
193 | return 0; | |
194 | strcpy(s, name); | |
195 | for (p = s; *p; p++) { | |
196 | if (*p == '/') | |
197 | *p = '!'; | |
198 | } | |
199 | ||
200 | devt = blk_lookup_devt(s, 0); | |
201 | if (devt) | |
202 | return devt; | |
203 | ||
204 | /* | |
205 | * Try non-existent, but valid partition, which may only exist after | |
206 | * opening the device, like partitioned md devices. | |
207 | */ | |
208 | while (p > s && isdigit(p[-1])) | |
209 | p--; | |
210 | if (p == s || !*p || *p == '0') | |
211 | return 0; | |
212 | ||
213 | /* try disk name without <part number> */ | |
214 | part = simple_strtoul(p, NULL, 10); | |
215 | *p = '\0'; | |
216 | devt = blk_lookup_devt(s, part); | |
217 | if (devt) | |
218 | return devt; | |
219 | ||
220 | /* try disk name without p<part number> */ | |
221 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
222 | return 0; | |
223 | p[-1] = '\0'; | |
224 | return blk_lookup_devt(s, part); | |
225 | } | |
226 | #endif /* CONFIG_BLOCK */ | |
227 | ||
228 | static dev_t devt_from_devnum(const char *name) | |
229 | { | |
230 | unsigned maj, min, offset; | |
231 | dev_t devt = 0; | |
232 | char *p, dummy; | |
233 | ||
234 | if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || | |
235 | sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { | |
236 | devt = MKDEV(maj, min); | |
237 | if (maj != MAJOR(devt) || min != MINOR(devt)) | |
238 | return 0; | |
239 | } else { | |
240 | devt = new_decode_dev(simple_strtoul(name, &p, 16)); | |
241 | if (*p) | |
242 | return 0; | |
243 | } | |
244 | ||
245 | return devt; | |
246 | } | |
b5af921e | 247 | |
1da177e4 LT |
248 | /* |
249 | * Convert a name into device number. We accept the following variants: | |
250 | * | |
0bf37ae4 PM |
251 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
252 | * no leading 0x, for example b302. | |
1da177e4 LT |
253 | * 2) /dev/nfs represents Root_NFS (0xff) |
254 | * 3) /dev/<disk_name> represents the device number of disk | |
255 | * 4) /dev/<disk_name><decimal> represents the device number | |
256 | * of partition - device number of disk plus the partition number | |
257 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
258 | * used when disk name of partitioned disk ends on a digit. | |
b5af921e WD |
259 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
260 | * unique id of a partition if the partition table provides it. | |
d33b98fc SW |
261 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
262 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- | |
263 | * filled hex representation of the 32-bit "NT disk signature", and PP | |
264 | * is a zero-filled hex representation of the 1-based partition number. | |
79975f13 WD |
265 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
266 | * a partition with a known unique id. | |
6c251611 SC |
267 | * 8) <major>:<minor> major and minor number of the device separated by |
268 | * a colon. | |
f027c34d NV |
269 | * 9) PARTLABEL=<name> with name being the GPT partition label. |
270 | * MSDOS partitions do not support labels! | |
8902dd52 | 271 | * 10) /dev/cifs represents Root_CIFS (0xfe) |
1da177e4 | 272 | * |
edfaa7c3 KS |
273 | * If name doesn't have fall into the categories above, we return (0,0). |
274 | * block_class is used to check if something is a disk name. If the disk | |
275 | * name contains slashes, the device name has them replaced with | |
276 | * bangs. | |
1da177e4 | 277 | */ |
e6e20a7a | 278 | dev_t name_to_dev_t(const char *name) |
1da177e4 | 279 | { |
c2637e80 CH |
280 | if (strcmp(name, "/dev/nfs") == 0) |
281 | return Root_NFS; | |
282 | if (strcmp(name, "/dev/cifs") == 0) | |
283 | return Root_CIFS; | |
284 | if (strcmp(name, "/dev/ram") == 0) | |
285 | return Root_RAM0; | |
6d0aed7a | 286 | #ifdef CONFIG_BLOCK |
c2637e80 CH |
287 | if (strncmp(name, "PARTUUID=", 9) == 0) |
288 | return devt_from_partuuid(name + 9); | |
289 | if (strncmp(name, "PARTLABEL=", 10) == 0) | |
290 | return devt_from_partlabel(name + 10); | |
291 | if (strncmp(name, "/dev/", 5) == 0) | |
292 | return devt_from_devname(name + 5); | |
6d0aed7a | 293 | #endif |
c2637e80 | 294 | return devt_from_devnum(name); |
1da177e4 | 295 | } |
e6e20a7a | 296 | EXPORT_SYMBOL_GPL(name_to_dev_t); |
1da177e4 LT |
297 | |
298 | static int __init root_dev_setup(char *line) | |
299 | { | |
300 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
301 | return 1; | |
302 | } | |
303 | ||
304 | __setup("root=", root_dev_setup); | |
305 | ||
cc1ed754 PO |
306 | static int __init rootwait_setup(char *str) |
307 | { | |
308 | if (*str) | |
309 | return 0; | |
310 | root_wait = 1; | |
311 | return 1; | |
312 | } | |
313 | ||
314 | __setup("rootwait", rootwait_setup); | |
315 | ||
1da177e4 LT |
316 | static char * __initdata root_mount_data; |
317 | static int __init root_data_setup(char *str) | |
318 | { | |
319 | root_mount_data = str; | |
320 | return 1; | |
321 | } | |
322 | ||
323 | static char * __initdata root_fs_names; | |
324 | static int __init fs_names_setup(char *str) | |
325 | { | |
326 | root_fs_names = str; | |
327 | return 1; | |
328 | } | |
329 | ||
330 | static unsigned int __initdata root_delay; | |
331 | static int __init root_delay_setup(char *str) | |
332 | { | |
333 | root_delay = simple_strtoul(str, NULL, 0); | |
334 | return 1; | |
335 | } | |
336 | ||
337 | __setup("rootflags=", root_data_setup); | |
338 | __setup("rootfstype=", fs_names_setup); | |
339 | __setup("rootdelay=", root_delay_setup); | |
340 | ||
341 | static void __init get_fs_names(char *page) | |
342 | { | |
343 | char *s = page; | |
344 | ||
345 | if (root_fs_names) { | |
346 | strcpy(page, root_fs_names); | |
347 | while (*s++) { | |
348 | if (s[-1] == ',') | |
349 | s[-1] = '\0'; | |
350 | } | |
351 | } else { | |
352 | int len = get_filesystem_list(page); | |
353 | char *p, *next; | |
354 | ||
355 | page[len] = '\0'; | |
356 | for (p = page-1; p; p = next) { | |
357 | next = strchr(++p, '\n'); | |
358 | if (*p++ != '\t') | |
359 | continue; | |
360 | while ((*s++ = *p++) != '\n') | |
361 | ; | |
362 | s[-1] = '\0'; | |
363 | } | |
364 | } | |
365 | *s = '\0'; | |
366 | } | |
367 | ||
cccaa5e3 DB |
368 | static int __init do_mount_root(const char *name, const char *fs, |
369 | const int flags, const void *data) | |
1da177e4 | 370 | { |
d8c9584e | 371 | struct super_block *s; |
7de7de7c LT |
372 | struct page *p = NULL; |
373 | char *data_page = NULL; | |
cccaa5e3 DB |
374 | int ret; |
375 | ||
7de7de7c | 376 | if (data) { |
c60166f0 | 377 | /* init_mount() requires a full page as fifth argument */ |
7de7de7c LT |
378 | p = alloc_page(GFP_KERNEL); |
379 | if (!p) | |
380 | return -ENOMEM; | |
381 | data_page = page_address(p); | |
c60166f0 | 382 | /* zero-pad. init_mount() will make sure it's terminated */ |
7de7de7c LT |
383 | strncpy(data_page, data, PAGE_SIZE); |
384 | } | |
cccaa5e3 | 385 | |
c60166f0 | 386 | ret = init_mount(name, "/root", fs, flags, data_page); |
cccaa5e3 DB |
387 | if (ret) |
388 | goto out; | |
1da177e4 | 389 | |
db63f1e3 | 390 | init_chdir("/root"); |
d8c9584e AV |
391 | s = current->fs->pwd.dentry->d_sb; |
392 | ROOT_DEV = s->s_dev; | |
80cdc6da MSB |
393 | printk(KERN_INFO |
394 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", | |
d8c9584e | 395 | s->s_type->name, |
bc98a42c | 396 | sb_rdonly(s) ? " readonly" : "", |
d8c9584e | 397 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
cccaa5e3 DB |
398 | |
399 | out: | |
7de7de7c LT |
400 | if (p) |
401 | put_page(p); | |
cccaa5e3 | 402 | return ret; |
1da177e4 LT |
403 | } |
404 | ||
405 | void __init mount_block_root(char *name, int flags) | |
406 | { | |
75f296d9 | 407 | struct page *page = alloc_page(GFP_KERNEL); |
a608ca21 | 408 | char *fs_names = page_address(page); |
1da177e4 LT |
409 | char *p; |
410 | char b[BDEVNAME_SIZE]; | |
411 | ||
ea3edd4d CH |
412 | scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)", |
413 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); | |
1da177e4 LT |
414 | get_fs_names(fs_names); |
415 | retry: | |
416 | for (p = fs_names; *p; p += strlen(p)+1) { | |
417 | int err = do_mount_root(name, p, flags, root_mount_data); | |
418 | switch (err) { | |
419 | case 0: | |
420 | goto out; | |
421 | case -EACCES: | |
1da177e4 LT |
422 | case -EINVAL: |
423 | continue; | |
424 | } | |
425 | /* | |
426 | * Allow the user to distinguish between failed sys_open | |
427 | * and bad superblock on root device. | |
dd2a345f | 428 | * and give them a list of the available devices |
1da177e4 | 429 | */ |
0e0cb892 BW |
430 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
431 | root_device_name, b, err); | |
dd2a345f | 432 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 433 | |
dd2a345f | 434 | printk_all_partitions(); |
1da177e4 LT |
435 | panic("VFS: Unable to mount root fs on %s", b); |
436 | } | |
e462ec50 DH |
437 | if (!(flags & SB_RDONLY)) { |
438 | flags |= SB_RDONLY; | |
10975933 MS |
439 | goto retry; |
440 | } | |
be6e028b | 441 | |
dd2a345f DG |
442 | printk("List of all partitions:\n"); |
443 | printk_all_partitions(); | |
be6e028b AW |
444 | printk("No filesystem could mount root, tried: "); |
445 | for (p = fs_names; *p; p += strlen(p)+1) | |
446 | printk(" %s", p); | |
447 | printk("\n"); | |
9361401e | 448 | panic("VFS: Unable to mount root fs on %s", b); |
1da177e4 | 449 | out: |
a608ca21 | 450 | put_page(page); |
1da177e4 LT |
451 | } |
452 | ||
453 | #ifdef CONFIG_ROOT_NFS | |
43717c7d CL |
454 | |
455 | #define NFSROOT_TIMEOUT_MIN 5 | |
456 | #define NFSROOT_TIMEOUT_MAX 30 | |
457 | #define NFSROOT_RETRY_MAX 5 | |
458 | ||
1da177e4 LT |
459 | static int __init mount_nfs_root(void) |
460 | { | |
56463e50 | 461 | char *root_dev, *root_data; |
43717c7d CL |
462 | unsigned int timeout; |
463 | int try, err; | |
1da177e4 | 464 | |
43717c7d CL |
465 | err = nfs_root_data(&root_dev, &root_data); |
466 | if (err != 0) | |
56463e50 | 467 | return 0; |
43717c7d CL |
468 | |
469 | /* | |
470 | * The server or network may not be ready, so try several | |
471 | * times. Stop after a few tries in case the client wants | |
472 | * to fall back to other boot methods. | |
473 | */ | |
474 | timeout = NFSROOT_TIMEOUT_MIN; | |
475 | for (try = 1; ; try++) { | |
476 | err = do_mount_root(root_dev, "nfs", | |
477 | root_mountflags, root_data); | |
478 | if (err == 0) | |
479 | return 1; | |
480 | if (try > NFSROOT_RETRY_MAX) | |
481 | break; | |
482 | ||
483 | /* Wait, in case the server refused us immediately */ | |
484 | ssleep(timeout); | |
485 | timeout <<= 1; | |
486 | if (timeout > NFSROOT_TIMEOUT_MAX) | |
487 | timeout = NFSROOT_TIMEOUT_MAX; | |
488 | } | |
489 | return 0; | |
1da177e4 LT |
490 | } |
491 | #endif | |
492 | ||
8902dd52 PAS |
493 | #ifdef CONFIG_CIFS_ROOT |
494 | ||
495 | extern int cifs_root_data(char **dev, char **opts); | |
496 | ||
497 | #define CIFSROOT_TIMEOUT_MIN 5 | |
498 | #define CIFSROOT_TIMEOUT_MAX 30 | |
499 | #define CIFSROOT_RETRY_MAX 5 | |
500 | ||
501 | static int __init mount_cifs_root(void) | |
502 | { | |
503 | char *root_dev, *root_data; | |
504 | unsigned int timeout; | |
505 | int try, err; | |
506 | ||
507 | err = cifs_root_data(&root_dev, &root_data); | |
508 | if (err != 0) | |
509 | return 0; | |
510 | ||
511 | timeout = CIFSROOT_TIMEOUT_MIN; | |
512 | for (try = 1; ; try++) { | |
513 | err = do_mount_root(root_dev, "cifs", root_mountflags, | |
514 | root_data); | |
515 | if (err == 0) | |
516 | return 1; | |
517 | if (try > CIFSROOT_RETRY_MAX) | |
518 | break; | |
519 | ||
520 | ssleep(timeout); | |
521 | timeout <<= 1; | |
522 | if (timeout > CIFSROOT_TIMEOUT_MAX) | |
523 | timeout = CIFSROOT_TIMEOUT_MAX; | |
524 | } | |
525 | return 0; | |
526 | } | |
527 | #endif | |
528 | ||
1da177e4 LT |
529 | void __init mount_root(void) |
530 | { | |
531 | #ifdef CONFIG_ROOT_NFS | |
377485f6 | 532 | if (ROOT_DEV == Root_NFS) { |
c8376994 CH |
533 | if (!mount_nfs_root()) |
534 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS.\n"); | |
535 | return; | |
1da177e4 LT |
536 | } |
537 | #endif | |
8902dd52 PAS |
538 | #ifdef CONFIG_CIFS_ROOT |
539 | if (ROOT_DEV == Root_CIFS) { | |
c8376994 CH |
540 | if (!mount_cifs_root()) |
541 | printk(KERN_ERR "VFS: Unable to mount root fs via SMB.\n"); | |
542 | return; | |
1da177e4 LT |
543 | } |
544 | #endif | |
9361401e | 545 | #ifdef CONFIG_BLOCK |
c69e3c3a VPS |
546 | { |
547 | int err = create_dev("/dev/root", ROOT_DEV); | |
548 | ||
549 | if (err < 0) | |
550 | pr_emerg("Failed to create /dev/root: %d\n", err); | |
551 | mount_block_root("/dev/root", root_mountflags); | |
552 | } | |
9361401e | 553 | #endif |
1da177e4 LT |
554 | } |
555 | ||
556 | /* | |
557 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
558 | */ | |
559 | void __init prepare_namespace(void) | |
560 | { | |
1da177e4 | 561 | if (root_delay) { |
ca75b4d8 | 562 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
1da177e4 LT |
563 | root_delay); |
564 | ssleep(root_delay); | |
565 | } | |
566 | ||
216773a7 AV |
567 | /* |
568 | * wait for the known devices to complete their probing | |
569 | * | |
570 | * Note: this is a potential source of long boot delays. | |
571 | * For example, it is not atypical to wait 5 seconds here | |
572 | * for the touchpad of a laptop to initialize. | |
573 | */ | |
574 | wait_for_device_probe(); | |
d779249e | 575 | |
1da177e4 LT |
576 | md_run_setup(); |
577 | ||
578 | if (saved_root_name[0]) { | |
579 | root_device_name = saved_root_name; | |
2d62f488 AH |
580 | if (!strncmp(root_device_name, "mtd", 3) || |
581 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
582 | mount_block_root(root_device_name, root_mountflags); |
583 | goto out; | |
584 | } | |
1da177e4 LT |
585 | ROOT_DEV = name_to_dev_t(root_device_name); |
586 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
587 | root_device_name += 5; | |
588 | } | |
589 | ||
1da177e4 LT |
590 | if (initrd_load()) |
591 | goto out; | |
592 | ||
cc1ed754 PO |
593 | /* wait for any asynchronous scanning to complete */ |
594 | if ((ROOT_DEV == 0) && root_wait) { | |
595 | printk(KERN_INFO "Waiting for root device %s...\n", | |
596 | saved_root_name); | |
597 | while (driver_probe_done() != 0 || | |
598 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
39a0e975 | 599 | msleep(5); |
216773a7 | 600 | async_synchronize_full(); |
cc1ed754 PO |
601 | } |
602 | ||
1da177e4 LT |
603 | mount_root(); |
604 | out: | |
5e787dbf | 605 | devtmpfs_mount(); |
c60166f0 | 606 | init_mount(".", "/", NULL, MS_MOVE, NULL); |
4b7ca501 | 607 | init_chroot("."); |
1da177e4 | 608 | } |
57f150a5 | 609 | |
6e19eded | 610 | static bool is_tmpfs; |
f3235626 | 611 | static int rootfs_init_fs_context(struct fs_context *fc) |
57f150a5 | 612 | { |
6e19eded | 613 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
f3235626 | 614 | return shmem_init_fs_context(fc); |
6e19eded | 615 | |
f3235626 | 616 | return ramfs_init_fs_context(fc); |
57f150a5 RL |
617 | } |
618 | ||
fd3e007f | 619 | struct file_system_type rootfs_fs_type = { |
57f150a5 | 620 | .name = "rootfs", |
f3235626 | 621 | .init_fs_context = rootfs_init_fs_context, |
57f150a5 RL |
622 | .kill_sb = kill_litter_super, |
623 | }; | |
624 | ||
037f11b4 | 625 | void __init init_rootfs(void) |
57f150a5 | 626 | { |
6e19eded | 627 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
037f11b4 | 628 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) |
6e19eded | 629 | is_tmpfs = true; |
57f150a5 | 630 | } |