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Commit | Line | Data |
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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> | |
e262e32d | 26 | #include <uapi/linux/mount.h> |
1da177e4 LT |
27 | |
28 | #include "do_mounts.h" | |
29 | ||
1da177e4 LT |
30 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
31 | ||
9b04c997 | 32 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 33 | static char * __initdata root_device_name; |
1da177e4 | 34 | static char __initdata saved_root_name[64]; |
79975f13 | 35 | static int root_wait; |
1da177e4 | 36 | |
1da177e4 LT |
37 | dev_t ROOT_DEV; |
38 | ||
1da177e4 LT |
39 | static int __init load_ramdisk(char *str) |
40 | { | |
41 | rd_doload = simple_strtol(str,NULL,0) & 3; | |
42 | return 1; | |
43 | } | |
44 | __setup("load_ramdisk=", load_ramdisk); | |
45 | ||
46 | static int __init readonly(char *str) | |
47 | { | |
48 | if (*str) | |
49 | return 0; | |
50 | root_mountflags |= MS_RDONLY; | |
51 | return 1; | |
52 | } | |
53 | ||
54 | static int __init readwrite(char *str) | |
55 | { | |
56 | if (*str) | |
57 | return 0; | |
58 | root_mountflags &= ~MS_RDONLY; | |
59 | return 1; | |
60 | } | |
61 | ||
62 | __setup("ro", readonly); | |
63 | __setup("rw", readwrite); | |
64 | ||
6d0aed7a | 65 | #ifdef CONFIG_BLOCK |
1ad7e899 SW |
66 | struct uuidcmp { |
67 | const char *uuid; | |
68 | int len; | |
69 | }; | |
70 | ||
b5af921e WD |
71 | /** |
72 | * match_dev_by_uuid - callback for finding a partition using its uuid | |
73 | * @dev: device passed in by the caller | |
1ad7e899 | 74 | * @data: opaque pointer to the desired struct uuidcmp to match |
b5af921e WD |
75 | * |
76 | * Returns 1 if the device matches, and 0 otherwise. | |
77 | */ | |
9f3b795a | 78 | static int match_dev_by_uuid(struct device *dev, const void *data) |
b5af921e | 79 | { |
9f3b795a | 80 | const struct uuidcmp *cmp = data; |
b5af921e WD |
81 | struct hd_struct *part = dev_to_part(dev); |
82 | ||
83 | if (!part->info) | |
84 | goto no_match; | |
85 | ||
1ad7e899 SW |
86 | if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) |
87 | goto no_match; | |
b5af921e WD |
88 | |
89 | return 1; | |
90 | no_match: | |
91 | return 0; | |
92 | } | |
93 | ||
94 | ||
95 | /** | |
96 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | |
a68b3108 | 97 | * @uuid_str: char array containing ascii UUID |
b5af921e WD |
98 | * |
99 | * The function will return the first partition which contains a matching | |
100 | * UUID value in its partition_meta_info struct. This does not search | |
101 | * by filesystem UUIDs. | |
102 | * | |
a68b3108 | 103 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
79975f13 WD |
104 | * extracted and used as an offset from the partition identified by the UUID. |
105 | * | |
b5af921e WD |
106 | * Returns the matching dev_t on success or 0 on failure. |
107 | */ | |
1ad7e899 | 108 | static dev_t devt_from_partuuid(const char *uuid_str) |
b5af921e WD |
109 | { |
110 | dev_t res = 0; | |
1ad7e899 | 111 | struct uuidcmp cmp; |
b5af921e | 112 | struct device *dev = NULL; |
79975f13 WD |
113 | struct gendisk *disk; |
114 | struct hd_struct *part; | |
115 | int offset = 0; | |
283f8fc0 SW |
116 | bool clear_root_wait = false; |
117 | char *slash; | |
79975f13 | 118 | |
1ad7e899 | 119 | cmp.uuid = uuid_str; |
1ad7e899 | 120 | |
283f8fc0 | 121 | slash = strchr(uuid_str, '/'); |
79975f13 | 122 | /* Check for optional partition number offset attributes. */ |
283f8fc0 | 123 | if (slash) { |
79975f13 WD |
124 | char c = 0; |
125 | /* Explicitly fail on poor PARTUUID syntax. */ | |
283f8fc0 SW |
126 | if (sscanf(slash + 1, |
127 | "PARTNROFF=%d%c", &offset, &c) != 1) { | |
128 | clear_root_wait = true; | |
79975f13 WD |
129 | goto done; |
130 | } | |
283f8fc0 SW |
131 | cmp.len = slash - uuid_str; |
132 | } else { | |
133 | cmp.len = strlen(uuid_str); | |
134 | } | |
135 | ||
136 | if (!cmp.len) { | |
137 | clear_root_wait = true; | |
138 | goto done; | |
79975f13 | 139 | } |
b5af921e | 140 | |
1ad7e899 SW |
141 | dev = class_find_device(&block_class, NULL, &cmp, |
142 | &match_dev_by_uuid); | |
b5af921e WD |
143 | if (!dev) |
144 | goto done; | |
145 | ||
146 | res = dev->devt; | |
b5af921e | 147 | |
79975f13 WD |
148 | /* Attempt to find the partition by offset. */ |
149 | if (!offset) | |
150 | goto no_offset; | |
151 | ||
152 | res = 0; | |
153 | disk = part_to_disk(dev_to_part(dev)); | |
154 | part = disk_get_part(disk, dev_to_part(dev)->partno + offset); | |
155 | if (part) { | |
156 | res = part_devt(part); | |
157 | put_device(part_to_dev(part)); | |
158 | } | |
159 | ||
160 | no_offset: | |
161 | put_device(dev); | |
b5af921e | 162 | done: |
283f8fc0 SW |
163 | if (clear_root_wait) { |
164 | pr_err("VFS: PARTUUID= is invalid.\n" | |
165 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); | |
166 | if (root_wait) | |
167 | pr_err("Disabling rootwait; root= is invalid.\n"); | |
168 | root_wait = 0; | |
169 | } | |
b5af921e WD |
170 | return res; |
171 | } | |
f027c34d NV |
172 | |
173 | /** | |
174 | * match_dev_by_label - callback for finding a partition using its label | |
175 | * @dev: device passed in by the caller | |
176 | * @data: opaque pointer to the label to match | |
177 | * | |
178 | * Returns 1 if the device matches, and 0 otherwise. | |
179 | */ | |
180 | static int match_dev_by_label(struct device *dev, const void *data) | |
181 | { | |
182 | const char *label = data; | |
183 | struct hd_struct *part = dev_to_part(dev); | |
184 | ||
185 | if (part->info && !strcmp(label, part->info->volname)) | |
186 | return 1; | |
187 | ||
188 | return 0; | |
189 | } | |
6d0aed7a | 190 | #endif |
b5af921e | 191 | |
1da177e4 LT |
192 | /* |
193 | * Convert a name into device number. We accept the following variants: | |
194 | * | |
0bf37ae4 PM |
195 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
196 | * no leading 0x, for example b302. | |
1da177e4 LT |
197 | * 2) /dev/nfs represents Root_NFS (0xff) |
198 | * 3) /dev/<disk_name> represents the device number of disk | |
199 | * 4) /dev/<disk_name><decimal> represents the device number | |
200 | * of partition - device number of disk plus the partition number | |
201 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
202 | * used when disk name of partitioned disk ends on a digit. | |
b5af921e WD |
203 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
204 | * unique id of a partition if the partition table provides it. | |
d33b98fc SW |
205 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
206 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- | |
207 | * filled hex representation of the 32-bit "NT disk signature", and PP | |
208 | * is a zero-filled hex representation of the 1-based partition number. | |
79975f13 WD |
209 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
210 | * a partition with a known unique id. | |
6c251611 SC |
211 | * 8) <major>:<minor> major and minor number of the device separated by |
212 | * a colon. | |
f027c34d NV |
213 | * 9) PARTLABEL=<name> with name being the GPT partition label. |
214 | * MSDOS partitions do not support labels! | |
1da177e4 | 215 | * |
edfaa7c3 KS |
216 | * If name doesn't have fall into the categories above, we return (0,0). |
217 | * block_class is used to check if something is a disk name. If the disk | |
218 | * name contains slashes, the device name has them replaced with | |
219 | * bangs. | |
1da177e4 LT |
220 | */ |
221 | ||
e6e20a7a | 222 | dev_t name_to_dev_t(const char *name) |
1da177e4 LT |
223 | { |
224 | char s[32]; | |
225 | char *p; | |
226 | dev_t res = 0; | |
30f2f0eb | 227 | int part; |
1da177e4 | 228 | |
6d0aed7a | 229 | #ifdef CONFIG_BLOCK |
b5af921e WD |
230 | if (strncmp(name, "PARTUUID=", 9) == 0) { |
231 | name += 9; | |
b5af921e WD |
232 | res = devt_from_partuuid(name); |
233 | if (!res) | |
234 | goto fail; | |
235 | goto done; | |
f027c34d NV |
236 | } else if (strncmp(name, "PARTLABEL=", 10) == 0) { |
237 | struct device *dev; | |
238 | ||
239 | dev = class_find_device(&block_class, NULL, name + 10, | |
240 | &match_dev_by_label); | |
241 | if (!dev) | |
242 | goto fail; | |
243 | ||
244 | res = dev->devt; | |
245 | put_device(dev); | |
246 | goto done; | |
b5af921e | 247 | } |
6d0aed7a | 248 | #endif |
b5af921e | 249 | |
1da177e4 | 250 | if (strncmp(name, "/dev/", 5) != 0) { |
cb31ef48 | 251 | unsigned maj, min, offset; |
283e7ad0 | 252 | char dummy; |
1da177e4 | 253 | |
cb31ef48 CY |
254 | if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) || |
255 | (sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) { | |
1da177e4 LT |
256 | res = MKDEV(maj, min); |
257 | if (maj != MAJOR(res) || min != MINOR(res)) | |
258 | goto fail; | |
259 | } else { | |
260 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
261 | if (*p) | |
262 | goto fail; | |
263 | } | |
264 | goto done; | |
265 | } | |
edfaa7c3 | 266 | |
1da177e4 LT |
267 | name += 5; |
268 | res = Root_NFS; | |
269 | if (strcmp(name, "nfs") == 0) | |
270 | goto done; | |
271 | res = Root_RAM0; | |
272 | if (strcmp(name, "ram") == 0) | |
273 | goto done; | |
274 | ||
275 | if (strlen(name) > 31) | |
276 | goto fail; | |
277 | strcpy(s, name); | |
278 | for (p = s; *p; p++) | |
279 | if (*p == '/') | |
280 | *p = '!'; | |
30f2f0eb KS |
281 | res = blk_lookup_devt(s, 0); |
282 | if (res) | |
283 | goto done; | |
284 | ||
285 | /* | |
25985edc | 286 | * try non-existent, but valid partition, which may only exist |
30f2f0eb KS |
287 | * after revalidating the disk, like partitioned md devices |
288 | */ | |
289 | while (p > s && isdigit(p[-1])) | |
290 | p--; | |
291 | if (p == s || !*p || *p == '0') | |
292 | goto fail; | |
293 | ||
294 | /* try disk name without <part number> */ | |
295 | part = simple_strtoul(p, NULL, 10); | |
296 | *p = '\0'; | |
297 | res = blk_lookup_devt(s, part); | |
298 | if (res) | |
299 | goto done; | |
300 | ||
301 | /* try disk name without p<part number> */ | |
302 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
303 | goto fail; | |
304 | p[-1] = '\0'; | |
305 | res = blk_lookup_devt(s, part); | |
1da177e4 LT |
306 | if (res) |
307 | goto done; | |
308 | ||
edfaa7c3 KS |
309 | fail: |
310 | return 0; | |
1da177e4 | 311 | done: |
1da177e4 | 312 | return res; |
1da177e4 | 313 | } |
e6e20a7a | 314 | EXPORT_SYMBOL_GPL(name_to_dev_t); |
1da177e4 LT |
315 | |
316 | static int __init root_dev_setup(char *line) | |
317 | { | |
318 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
319 | return 1; | |
320 | } | |
321 | ||
322 | __setup("root=", root_dev_setup); | |
323 | ||
cc1ed754 PO |
324 | static int __init rootwait_setup(char *str) |
325 | { | |
326 | if (*str) | |
327 | return 0; | |
328 | root_wait = 1; | |
329 | return 1; | |
330 | } | |
331 | ||
332 | __setup("rootwait", rootwait_setup); | |
333 | ||
1da177e4 LT |
334 | static char * __initdata root_mount_data; |
335 | static int __init root_data_setup(char *str) | |
336 | { | |
337 | root_mount_data = str; | |
338 | return 1; | |
339 | } | |
340 | ||
341 | static char * __initdata root_fs_names; | |
342 | static int __init fs_names_setup(char *str) | |
343 | { | |
344 | root_fs_names = str; | |
345 | return 1; | |
346 | } | |
347 | ||
348 | static unsigned int __initdata root_delay; | |
349 | static int __init root_delay_setup(char *str) | |
350 | { | |
351 | root_delay = simple_strtoul(str, NULL, 0); | |
352 | return 1; | |
353 | } | |
354 | ||
355 | __setup("rootflags=", root_data_setup); | |
356 | __setup("rootfstype=", fs_names_setup); | |
357 | __setup("rootdelay=", root_delay_setup); | |
358 | ||
359 | static void __init get_fs_names(char *page) | |
360 | { | |
361 | char *s = page; | |
362 | ||
363 | if (root_fs_names) { | |
364 | strcpy(page, root_fs_names); | |
365 | while (*s++) { | |
366 | if (s[-1] == ',') | |
367 | s[-1] = '\0'; | |
368 | } | |
369 | } else { | |
370 | int len = get_filesystem_list(page); | |
371 | char *p, *next; | |
372 | ||
373 | page[len] = '\0'; | |
374 | for (p = page-1; p; p = next) { | |
375 | next = strchr(++p, '\n'); | |
376 | if (*p++ != '\t') | |
377 | continue; | |
378 | while ((*s++ = *p++) != '\n') | |
379 | ; | |
380 | s[-1] = '\0'; | |
381 | } | |
382 | } | |
383 | *s = '\0'; | |
384 | } | |
385 | ||
386 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
387 | { | |
d8c9584e | 388 | struct super_block *s; |
312db1aa | 389 | int err = ksys_mount(name, "/root", fs, flags, data); |
1da177e4 LT |
390 | if (err) |
391 | return err; | |
392 | ||
447016e9 | 393 | ksys_chdir("/root"); |
d8c9584e AV |
394 | s = current->fs->pwd.dentry->d_sb; |
395 | ROOT_DEV = s->s_dev; | |
80cdc6da MSB |
396 | printk(KERN_INFO |
397 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", | |
d8c9584e | 398 | s->s_type->name, |
bc98a42c | 399 | sb_rdonly(s) ? " readonly" : "", |
d8c9584e | 400 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
1da177e4 LT |
401 | return 0; |
402 | } | |
403 | ||
404 | void __init mount_block_root(char *name, int flags) | |
405 | { | |
75f296d9 | 406 | struct page *page = alloc_page(GFP_KERNEL); |
a608ca21 | 407 | char *fs_names = page_address(page); |
1da177e4 | 408 | char *p; |
9361401e | 409 | #ifdef CONFIG_BLOCK |
1da177e4 | 410 | char b[BDEVNAME_SIZE]; |
9361401e DH |
411 | #else |
412 | const char *b = name; | |
413 | #endif | |
1da177e4 LT |
414 | |
415 | get_fs_names(fs_names); | |
416 | retry: | |
417 | for (p = fs_names; *p; p += strlen(p)+1) { | |
418 | int err = do_mount_root(name, p, flags, root_mount_data); | |
419 | switch (err) { | |
420 | case 0: | |
421 | goto out; | |
422 | case -EACCES: | |
1da177e4 LT |
423 | case -EINVAL: |
424 | continue; | |
425 | } | |
426 | /* | |
427 | * Allow the user to distinguish between failed sys_open | |
428 | * and bad superblock on root device. | |
dd2a345f | 429 | * and give them a list of the available devices |
1da177e4 | 430 | */ |
9361401e | 431 | #ifdef CONFIG_BLOCK |
1da177e4 | 432 | __bdevname(ROOT_DEV, b); |
9361401e | 433 | #endif |
0e0cb892 BW |
434 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
435 | root_device_name, b, err); | |
dd2a345f | 436 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 437 | |
dd2a345f | 438 | printk_all_partitions(); |
55dc7db7 TH |
439 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
440 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
441 | "explicit textual name for \"root=\" boot option.\n"); | |
442 | #endif | |
1da177e4 LT |
443 | panic("VFS: Unable to mount root fs on %s", b); |
444 | } | |
e462ec50 DH |
445 | if (!(flags & SB_RDONLY)) { |
446 | flags |= SB_RDONLY; | |
10975933 MS |
447 | goto retry; |
448 | } | |
be6e028b | 449 | |
dd2a345f DG |
450 | printk("List of all partitions:\n"); |
451 | printk_all_partitions(); | |
be6e028b AW |
452 | printk("No filesystem could mount root, tried: "); |
453 | for (p = fs_names; *p; p += strlen(p)+1) | |
454 | printk(" %s", p); | |
455 | printk("\n"); | |
9361401e DH |
456 | #ifdef CONFIG_BLOCK |
457 | __bdevname(ROOT_DEV, b); | |
458 | #endif | |
459 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 | 460 | out: |
a608ca21 | 461 | put_page(page); |
1da177e4 LT |
462 | } |
463 | ||
464 | #ifdef CONFIG_ROOT_NFS | |
43717c7d CL |
465 | |
466 | #define NFSROOT_TIMEOUT_MIN 5 | |
467 | #define NFSROOT_TIMEOUT_MAX 30 | |
468 | #define NFSROOT_RETRY_MAX 5 | |
469 | ||
1da177e4 LT |
470 | static int __init mount_nfs_root(void) |
471 | { | |
56463e50 | 472 | char *root_dev, *root_data; |
43717c7d CL |
473 | unsigned int timeout; |
474 | int try, err; | |
1da177e4 | 475 | |
43717c7d CL |
476 | err = nfs_root_data(&root_dev, &root_data); |
477 | if (err != 0) | |
56463e50 | 478 | return 0; |
43717c7d CL |
479 | |
480 | /* | |
481 | * The server or network may not be ready, so try several | |
482 | * times. Stop after a few tries in case the client wants | |
483 | * to fall back to other boot methods. | |
484 | */ | |
485 | timeout = NFSROOT_TIMEOUT_MIN; | |
486 | for (try = 1; ; try++) { | |
487 | err = do_mount_root(root_dev, "nfs", | |
488 | root_mountflags, root_data); | |
489 | if (err == 0) | |
490 | return 1; | |
491 | if (try > NFSROOT_RETRY_MAX) | |
492 | break; | |
493 | ||
494 | /* Wait, in case the server refused us immediately */ | |
495 | ssleep(timeout); | |
496 | timeout <<= 1; | |
497 | if (timeout > NFSROOT_TIMEOUT_MAX) | |
498 | timeout = NFSROOT_TIMEOUT_MAX; | |
499 | } | |
500 | return 0; | |
1da177e4 LT |
501 | } |
502 | #endif | |
503 | ||
504 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
505 | void __init change_floppy(char *fmt, ...) | |
506 | { | |
507 | struct termios termios; | |
508 | char buf[80]; | |
509 | char c; | |
510 | int fd; | |
511 | va_list args; | |
512 | va_start(args, fmt); | |
513 | vsprintf(buf, fmt, args); | |
514 | va_end(args); | |
bae217ea | 515 | fd = ksys_open("/dev/root", O_RDWR | O_NDELAY, 0); |
1da177e4 | 516 | if (fd >= 0) { |
cbb60b92 | 517 | ksys_ioctl(fd, FDEJECT, 0); |
2ca2a09d | 518 | ksys_close(fd); |
1da177e4 LT |
519 | } |
520 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
bae217ea | 521 | fd = ksys_open("/dev/console", O_RDWR, 0); |
1da177e4 | 522 | if (fd >= 0) { |
cbb60b92 | 523 | ksys_ioctl(fd, TCGETS, (long)&termios); |
1da177e4 | 524 | termios.c_lflag &= ~ICANON; |
cbb60b92 | 525 | ksys_ioctl(fd, TCSETSF, (long)&termios); |
3ce4a7bf | 526 | ksys_read(fd, &c, 1); |
1da177e4 | 527 | termios.c_lflag |= ICANON; |
cbb60b92 | 528 | ksys_ioctl(fd, TCSETSF, (long)&termios); |
2ca2a09d | 529 | ksys_close(fd); |
1da177e4 LT |
530 | } |
531 | } | |
532 | #endif | |
533 | ||
534 | void __init mount_root(void) | |
535 | { | |
536 | #ifdef CONFIG_ROOT_NFS | |
377485f6 | 537 | if (ROOT_DEV == Root_NFS) { |
1da177e4 LT |
538 | if (mount_nfs_root()) |
539 | return; | |
540 | ||
541 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
542 | ROOT_DEV = Root_FD0; | |
543 | } | |
544 | #endif | |
545 | #ifdef CONFIG_BLK_DEV_FD | |
546 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
547 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
548 | if (rd_doload==2) { | |
549 | if (rd_load_disk(1)) { | |
550 | ROOT_DEV = Root_RAM1; | |
551 | root_device_name = NULL; | |
552 | } | |
553 | } else | |
554 | change_floppy("root floppy"); | |
555 | } | |
556 | #endif | |
9361401e | 557 | #ifdef CONFIG_BLOCK |
c69e3c3a VPS |
558 | { |
559 | int err = create_dev("/dev/root", ROOT_DEV); | |
560 | ||
561 | if (err < 0) | |
562 | pr_emerg("Failed to create /dev/root: %d\n", err); | |
563 | mount_block_root("/dev/root", root_mountflags); | |
564 | } | |
9361401e | 565 | #endif |
1da177e4 LT |
566 | } |
567 | ||
568 | /* | |
569 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
570 | */ | |
571 | void __init prepare_namespace(void) | |
572 | { | |
573 | int is_floppy; | |
574 | ||
1da177e4 | 575 | if (root_delay) { |
ca75b4d8 | 576 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
1da177e4 LT |
577 | root_delay); |
578 | ssleep(root_delay); | |
579 | } | |
580 | ||
216773a7 AV |
581 | /* |
582 | * wait for the known devices to complete their probing | |
583 | * | |
584 | * Note: this is a potential source of long boot delays. | |
585 | * For example, it is not atypical to wait 5 seconds here | |
586 | * for the touchpad of a laptop to initialize. | |
587 | */ | |
588 | wait_for_device_probe(); | |
d779249e | 589 | |
1da177e4 LT |
590 | md_run_setup(); |
591 | ||
592 | if (saved_root_name[0]) { | |
593 | root_device_name = saved_root_name; | |
2d62f488 AH |
594 | if (!strncmp(root_device_name, "mtd", 3) || |
595 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
596 | mount_block_root(root_device_name, root_mountflags); |
597 | goto out; | |
598 | } | |
1da177e4 LT |
599 | ROOT_DEV = name_to_dev_t(root_device_name); |
600 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
601 | root_device_name += 5; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | if (initrd_load()) |
605 | goto out; | |
606 | ||
cc1ed754 PO |
607 | /* wait for any asynchronous scanning to complete */ |
608 | if ((ROOT_DEV == 0) && root_wait) { | |
609 | printk(KERN_INFO "Waiting for root device %s...\n", | |
610 | saved_root_name); | |
611 | while (driver_probe_done() != 0 || | |
612 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
39a0e975 | 613 | msleep(5); |
216773a7 | 614 | async_synchronize_full(); |
cc1ed754 PO |
615 | } |
616 | ||
617 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
618 | ||
1da177e4 LT |
619 | if (is_floppy && rd_doload && rd_load_disk(0)) |
620 | ROOT_DEV = Root_RAM0; | |
621 | ||
622 | mount_root(); | |
623 | out: | |
2b2af54a | 624 | devtmpfs_mount("dev"); |
312db1aa | 625 | ksys_mount(".", "/", NULL, MS_MOVE, NULL); |
a16fe33a | 626 | ksys_chroot("."); |
1da177e4 | 627 | } |
57f150a5 | 628 | |
6e19eded | 629 | static bool is_tmpfs; |
57f150a5 RL |
630 | static struct dentry *rootfs_mount(struct file_system_type *fs_type, |
631 | int flags, const char *dev_name, void *data) | |
632 | { | |
633 | static unsigned long once; | |
6e19eded | 634 | void *fill = ramfs_fill_super; |
57f150a5 RL |
635 | |
636 | if (test_and_set_bit(0, &once)) | |
637 | return ERR_PTR(-ENODEV); | |
638 | ||
6e19eded RL |
639 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
640 | fill = shmem_fill_super; | |
641 | ||
642 | return mount_nodev(fs_type, flags, data, fill); | |
57f150a5 RL |
643 | } |
644 | ||
645 | static struct file_system_type rootfs_fs_type = { | |
646 | .name = "rootfs", | |
647 | .mount = rootfs_mount, | |
648 | .kill_sb = kill_litter_super, | |
649 | }; | |
650 | ||
651 | int __init init_rootfs(void) | |
652 | { | |
653 | int err = register_filesystem(&rootfs_fs_type); | |
654 | ||
655 | if (err) | |
656 | return err; | |
657 | ||
6e19eded RL |
658 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
659 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { | |
16203a7a | 660 | err = shmem_init(); |
6e19eded RL |
661 | is_tmpfs = true; |
662 | } else { | |
16203a7a | 663 | err = init_ramfs_fs(); |
6e19eded | 664 | } |
16203a7a | 665 | |
57f150a5 RL |
666 | if (err) |
667 | unregister_filesystem(&rootfs_fs_type); | |
668 | ||
669 | return err; | |
670 | } |