Commit | Line | Data |
---|---|---|
c67e5382 HS |
1 | /* |
2 | * Many of the syscalls used in this file expect some of the arguments | |
3 | * to be __user pointers not __kernel pointers. To limit the sparse | |
4 | * noise, turn off sparse checking for this file. | |
5 | */ | |
6 | #ifdef __CHECKER__ | |
7 | #undef __CHECKER__ | |
8 | #warning "Sparse checking disabled for this file" | |
9 | #endif | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/sched.h> | |
13 | #include <linux/ctype.h> | |
14 | #include <linux/fd.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/suspend.h> | |
17 | #include <linux/root_dev.h> | |
18 | #include <linux/security.h> | |
19 | #include <linux/delay.h> | |
dd2a345f | 20 | #include <linux/genhd.h> |
d53d9f16 | 21 | #include <linux/mount.h> |
d779249e | 22 | #include <linux/device.h> |
46595390 | 23 | #include <linux/init.h> |
011e3fcd | 24 | #include <linux/fs.h> |
82c8253a | 25 | #include <linux/initrd.h> |
22a9d645 | 26 | #include <linux/async.h> |
5ad4e53b | 27 | #include <linux/fs_struct.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
57f150a5 | 29 | #include <linux/ramfs.h> |
16203a7a | 30 | #include <linux/shmem_fs.h> |
1da177e4 LT |
31 | |
32 | #include <linux/nfs_fs.h> | |
33 | #include <linux/nfs_fs_sb.h> | |
34 | #include <linux/nfs_mount.h> | |
35 | ||
36 | #include "do_mounts.h" | |
37 | ||
1da177e4 LT |
38 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
39 | ||
9b04c997 | 40 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 41 | static char * __initdata root_device_name; |
1da177e4 | 42 | static char __initdata saved_root_name[64]; |
79975f13 | 43 | static int root_wait; |
1da177e4 | 44 | |
1da177e4 LT |
45 | dev_t ROOT_DEV; |
46 | ||
1da177e4 LT |
47 | static int __init load_ramdisk(char *str) |
48 | { | |
49 | rd_doload = simple_strtol(str,NULL,0) & 3; | |
50 | return 1; | |
51 | } | |
52 | __setup("load_ramdisk=", load_ramdisk); | |
53 | ||
54 | static int __init readonly(char *str) | |
55 | { | |
56 | if (*str) | |
57 | return 0; | |
58 | root_mountflags |= MS_RDONLY; | |
59 | return 1; | |
60 | } | |
61 | ||
62 | static int __init readwrite(char *str) | |
63 | { | |
64 | if (*str) | |
65 | return 0; | |
66 | root_mountflags &= ~MS_RDONLY; | |
67 | return 1; | |
68 | } | |
69 | ||
70 | __setup("ro", readonly); | |
71 | __setup("rw", readwrite); | |
72 | ||
6d0aed7a | 73 | #ifdef CONFIG_BLOCK |
1ad7e899 SW |
74 | struct uuidcmp { |
75 | const char *uuid; | |
76 | int len; | |
77 | }; | |
78 | ||
b5af921e WD |
79 | /** |
80 | * match_dev_by_uuid - callback for finding a partition using its uuid | |
81 | * @dev: device passed in by the caller | |
1ad7e899 | 82 | * @data: opaque pointer to the desired struct uuidcmp to match |
b5af921e WD |
83 | * |
84 | * Returns 1 if the device matches, and 0 otherwise. | |
85 | */ | |
9f3b795a | 86 | static int match_dev_by_uuid(struct device *dev, const void *data) |
b5af921e | 87 | { |
9f3b795a | 88 | const struct uuidcmp *cmp = data; |
b5af921e WD |
89 | struct hd_struct *part = dev_to_part(dev); |
90 | ||
91 | if (!part->info) | |
92 | goto no_match; | |
93 | ||
1ad7e899 SW |
94 | if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) |
95 | goto no_match; | |
b5af921e WD |
96 | |
97 | return 1; | |
98 | no_match: | |
99 | return 0; | |
100 | } | |
101 | ||
102 | ||
103 | /** | |
104 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | |
a68b3108 | 105 | * @uuid_str: char array containing ascii UUID |
b5af921e WD |
106 | * |
107 | * The function will return the first partition which contains a matching | |
108 | * UUID value in its partition_meta_info struct. This does not search | |
109 | * by filesystem UUIDs. | |
110 | * | |
a68b3108 | 111 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
79975f13 WD |
112 | * extracted and used as an offset from the partition identified by the UUID. |
113 | * | |
b5af921e WD |
114 | * Returns the matching dev_t on success or 0 on failure. |
115 | */ | |
1ad7e899 | 116 | static dev_t devt_from_partuuid(const char *uuid_str) |
b5af921e WD |
117 | { |
118 | dev_t res = 0; | |
1ad7e899 | 119 | struct uuidcmp cmp; |
b5af921e | 120 | struct device *dev = NULL; |
79975f13 WD |
121 | struct gendisk *disk; |
122 | struct hd_struct *part; | |
123 | int offset = 0; | |
283f8fc0 SW |
124 | bool clear_root_wait = false; |
125 | char *slash; | |
79975f13 | 126 | |
1ad7e899 | 127 | cmp.uuid = uuid_str; |
1ad7e899 | 128 | |
283f8fc0 | 129 | slash = strchr(uuid_str, '/'); |
79975f13 | 130 | /* Check for optional partition number offset attributes. */ |
283f8fc0 | 131 | if (slash) { |
79975f13 WD |
132 | char c = 0; |
133 | /* Explicitly fail on poor PARTUUID syntax. */ | |
283f8fc0 SW |
134 | if (sscanf(slash + 1, |
135 | "PARTNROFF=%d%c", &offset, &c) != 1) { | |
136 | clear_root_wait = true; | |
79975f13 WD |
137 | goto done; |
138 | } | |
283f8fc0 SW |
139 | cmp.len = slash - uuid_str; |
140 | } else { | |
141 | cmp.len = strlen(uuid_str); | |
142 | } | |
143 | ||
144 | if (!cmp.len) { | |
145 | clear_root_wait = true; | |
146 | goto done; | |
79975f13 | 147 | } |
b5af921e | 148 | |
1ad7e899 SW |
149 | dev = class_find_device(&block_class, NULL, &cmp, |
150 | &match_dev_by_uuid); | |
b5af921e WD |
151 | if (!dev) |
152 | goto done; | |
153 | ||
154 | res = dev->devt; | |
b5af921e | 155 | |
79975f13 WD |
156 | /* Attempt to find the partition by offset. */ |
157 | if (!offset) | |
158 | goto no_offset; | |
159 | ||
160 | res = 0; | |
161 | disk = part_to_disk(dev_to_part(dev)); | |
162 | part = disk_get_part(disk, dev_to_part(dev)->partno + offset); | |
163 | if (part) { | |
164 | res = part_devt(part); | |
165 | put_device(part_to_dev(part)); | |
166 | } | |
167 | ||
168 | no_offset: | |
169 | put_device(dev); | |
b5af921e | 170 | done: |
283f8fc0 SW |
171 | if (clear_root_wait) { |
172 | pr_err("VFS: PARTUUID= is invalid.\n" | |
173 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); | |
174 | if (root_wait) | |
175 | pr_err("Disabling rootwait; root= is invalid.\n"); | |
176 | root_wait = 0; | |
177 | } | |
b5af921e WD |
178 | return res; |
179 | } | |
6d0aed7a | 180 | #endif |
b5af921e | 181 | |
1da177e4 LT |
182 | /* |
183 | * Convert a name into device number. We accept the following variants: | |
184 | * | |
0bf37ae4 PM |
185 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
186 | * no leading 0x, for example b302. | |
1da177e4 LT |
187 | * 2) /dev/nfs represents Root_NFS (0xff) |
188 | * 3) /dev/<disk_name> represents the device number of disk | |
189 | * 4) /dev/<disk_name><decimal> represents the device number | |
190 | * of partition - device number of disk plus the partition number | |
191 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
192 | * used when disk name of partitioned disk ends on a digit. | |
b5af921e WD |
193 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
194 | * unique id of a partition if the partition table provides it. | |
d33b98fc SW |
195 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
196 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- | |
197 | * filled hex representation of the 32-bit "NT disk signature", and PP | |
198 | * is a zero-filled hex representation of the 1-based partition number. | |
79975f13 WD |
199 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
200 | * a partition with a known unique id. | |
6c251611 SC |
201 | * 8) <major>:<minor> major and minor number of the device separated by |
202 | * a colon. | |
1da177e4 | 203 | * |
edfaa7c3 KS |
204 | * If name doesn't have fall into the categories above, we return (0,0). |
205 | * block_class is used to check if something is a disk name. If the disk | |
206 | * name contains slashes, the device name has them replaced with | |
207 | * bangs. | |
1da177e4 LT |
208 | */ |
209 | ||
e6e20a7a | 210 | dev_t name_to_dev_t(const char *name) |
1da177e4 LT |
211 | { |
212 | char s[32]; | |
213 | char *p; | |
214 | dev_t res = 0; | |
30f2f0eb | 215 | int part; |
1da177e4 | 216 | |
6d0aed7a | 217 | #ifdef CONFIG_BLOCK |
b5af921e WD |
218 | if (strncmp(name, "PARTUUID=", 9) == 0) { |
219 | name += 9; | |
b5af921e WD |
220 | res = devt_from_partuuid(name); |
221 | if (!res) | |
222 | goto fail; | |
223 | goto done; | |
224 | } | |
6d0aed7a | 225 | #endif |
b5af921e | 226 | |
1da177e4 | 227 | if (strncmp(name, "/dev/", 5) != 0) { |
cb31ef48 | 228 | unsigned maj, min, offset; |
283e7ad0 | 229 | char dummy; |
1da177e4 | 230 | |
cb31ef48 CY |
231 | if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) || |
232 | (sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) { | |
1da177e4 LT |
233 | res = MKDEV(maj, min); |
234 | if (maj != MAJOR(res) || min != MINOR(res)) | |
235 | goto fail; | |
236 | } else { | |
237 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
238 | if (*p) | |
239 | goto fail; | |
240 | } | |
241 | goto done; | |
242 | } | |
edfaa7c3 | 243 | |
1da177e4 LT |
244 | name += 5; |
245 | res = Root_NFS; | |
246 | if (strcmp(name, "nfs") == 0) | |
247 | goto done; | |
248 | res = Root_RAM0; | |
249 | if (strcmp(name, "ram") == 0) | |
250 | goto done; | |
251 | ||
252 | if (strlen(name) > 31) | |
253 | goto fail; | |
254 | strcpy(s, name); | |
255 | for (p = s; *p; p++) | |
256 | if (*p == '/') | |
257 | *p = '!'; | |
30f2f0eb KS |
258 | res = blk_lookup_devt(s, 0); |
259 | if (res) | |
260 | goto done; | |
261 | ||
262 | /* | |
25985edc | 263 | * try non-existent, but valid partition, which may only exist |
30f2f0eb KS |
264 | * after revalidating the disk, like partitioned md devices |
265 | */ | |
266 | while (p > s && isdigit(p[-1])) | |
267 | p--; | |
268 | if (p == s || !*p || *p == '0') | |
269 | goto fail; | |
270 | ||
271 | /* try disk name without <part number> */ | |
272 | part = simple_strtoul(p, NULL, 10); | |
273 | *p = '\0'; | |
274 | res = blk_lookup_devt(s, part); | |
275 | if (res) | |
276 | goto done; | |
277 | ||
278 | /* try disk name without p<part number> */ | |
279 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
280 | goto fail; | |
281 | p[-1] = '\0'; | |
282 | res = blk_lookup_devt(s, part); | |
1da177e4 LT |
283 | if (res) |
284 | goto done; | |
285 | ||
edfaa7c3 KS |
286 | fail: |
287 | return 0; | |
1da177e4 | 288 | done: |
1da177e4 | 289 | return res; |
1da177e4 | 290 | } |
e6e20a7a | 291 | EXPORT_SYMBOL_GPL(name_to_dev_t); |
1da177e4 LT |
292 | |
293 | static int __init root_dev_setup(char *line) | |
294 | { | |
295 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
296 | return 1; | |
297 | } | |
298 | ||
299 | __setup("root=", root_dev_setup); | |
300 | ||
cc1ed754 PO |
301 | static int __init rootwait_setup(char *str) |
302 | { | |
303 | if (*str) | |
304 | return 0; | |
305 | root_wait = 1; | |
306 | return 1; | |
307 | } | |
308 | ||
309 | __setup("rootwait", rootwait_setup); | |
310 | ||
1da177e4 LT |
311 | static char * __initdata root_mount_data; |
312 | static int __init root_data_setup(char *str) | |
313 | { | |
314 | root_mount_data = str; | |
315 | return 1; | |
316 | } | |
317 | ||
318 | static char * __initdata root_fs_names; | |
319 | static int __init fs_names_setup(char *str) | |
320 | { | |
321 | root_fs_names = str; | |
322 | return 1; | |
323 | } | |
324 | ||
325 | static unsigned int __initdata root_delay; | |
326 | static int __init root_delay_setup(char *str) | |
327 | { | |
328 | root_delay = simple_strtoul(str, NULL, 0); | |
329 | return 1; | |
330 | } | |
331 | ||
332 | __setup("rootflags=", root_data_setup); | |
333 | __setup("rootfstype=", fs_names_setup); | |
334 | __setup("rootdelay=", root_delay_setup); | |
335 | ||
336 | static void __init get_fs_names(char *page) | |
337 | { | |
338 | char *s = page; | |
339 | ||
340 | if (root_fs_names) { | |
341 | strcpy(page, root_fs_names); | |
342 | while (*s++) { | |
343 | if (s[-1] == ',') | |
344 | s[-1] = '\0'; | |
345 | } | |
346 | } else { | |
347 | int len = get_filesystem_list(page); | |
348 | char *p, *next; | |
349 | ||
350 | page[len] = '\0'; | |
351 | for (p = page-1; p; p = next) { | |
352 | next = strchr(++p, '\n'); | |
353 | if (*p++ != '\t') | |
354 | continue; | |
355 | while ((*s++ = *p++) != '\n') | |
356 | ; | |
357 | s[-1] = '\0'; | |
358 | } | |
359 | } | |
360 | *s = '\0'; | |
361 | } | |
362 | ||
363 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
364 | { | |
d8c9584e | 365 | struct super_block *s; |
1da177e4 LT |
366 | int err = sys_mount(name, "/root", fs, flags, data); |
367 | if (err) | |
368 | return err; | |
369 | ||
c67e5382 | 370 | sys_chdir("/root"); |
d8c9584e AV |
371 | s = current->fs->pwd.dentry->d_sb; |
372 | ROOT_DEV = s->s_dev; | |
80cdc6da MSB |
373 | printk(KERN_INFO |
374 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", | |
d8c9584e AV |
375 | s->s_type->name, |
376 | s->s_flags & MS_RDONLY ? " readonly" : "", | |
377 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); | |
1da177e4 LT |
378 | return 0; |
379 | } | |
380 | ||
381 | void __init mount_block_root(char *name, int flags) | |
382 | { | |
a608ca21 JL |
383 | struct page *page = alloc_page(GFP_KERNEL | |
384 | __GFP_NOTRACK_FALSE_POSITIVE); | |
385 | char *fs_names = page_address(page); | |
1da177e4 | 386 | char *p; |
9361401e | 387 | #ifdef CONFIG_BLOCK |
1da177e4 | 388 | char b[BDEVNAME_SIZE]; |
9361401e DH |
389 | #else |
390 | const char *b = name; | |
391 | #endif | |
1da177e4 LT |
392 | |
393 | get_fs_names(fs_names); | |
394 | retry: | |
395 | for (p = fs_names; *p; p += strlen(p)+1) { | |
396 | int err = do_mount_root(name, p, flags, root_mount_data); | |
397 | switch (err) { | |
398 | case 0: | |
399 | goto out; | |
400 | case -EACCES: | |
1da177e4 LT |
401 | case -EINVAL: |
402 | continue; | |
403 | } | |
404 | /* | |
405 | * Allow the user to distinguish between failed sys_open | |
406 | * and bad superblock on root device. | |
dd2a345f | 407 | * and give them a list of the available devices |
1da177e4 | 408 | */ |
9361401e | 409 | #ifdef CONFIG_BLOCK |
1da177e4 | 410 | __bdevname(ROOT_DEV, b); |
9361401e | 411 | #endif |
0e0cb892 BW |
412 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
413 | root_device_name, b, err); | |
dd2a345f | 414 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 415 | |
dd2a345f | 416 | printk_all_partitions(); |
55dc7db7 TH |
417 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
418 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
419 | "explicit textual name for \"root=\" boot option.\n"); | |
420 | #endif | |
1da177e4 LT |
421 | panic("VFS: Unable to mount root fs on %s", b); |
422 | } | |
10975933 MS |
423 | if (!(flags & MS_RDONLY)) { |
424 | flags |= MS_RDONLY; | |
425 | goto retry; | |
426 | } | |
be6e028b | 427 | |
dd2a345f DG |
428 | printk("List of all partitions:\n"); |
429 | printk_all_partitions(); | |
be6e028b AW |
430 | printk("No filesystem could mount root, tried: "); |
431 | for (p = fs_names; *p; p += strlen(p)+1) | |
432 | printk(" %s", p); | |
433 | printk("\n"); | |
9361401e DH |
434 | #ifdef CONFIG_BLOCK |
435 | __bdevname(ROOT_DEV, b); | |
436 | #endif | |
437 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 | 438 | out: |
a608ca21 | 439 | put_page(page); |
1da177e4 LT |
440 | } |
441 | ||
442 | #ifdef CONFIG_ROOT_NFS | |
43717c7d CL |
443 | |
444 | #define NFSROOT_TIMEOUT_MIN 5 | |
445 | #define NFSROOT_TIMEOUT_MAX 30 | |
446 | #define NFSROOT_RETRY_MAX 5 | |
447 | ||
1da177e4 LT |
448 | static int __init mount_nfs_root(void) |
449 | { | |
56463e50 | 450 | char *root_dev, *root_data; |
43717c7d CL |
451 | unsigned int timeout; |
452 | int try, err; | |
1da177e4 | 453 | |
43717c7d CL |
454 | err = nfs_root_data(&root_dev, &root_data); |
455 | if (err != 0) | |
56463e50 | 456 | return 0; |
43717c7d CL |
457 | |
458 | /* | |
459 | * The server or network may not be ready, so try several | |
460 | * times. Stop after a few tries in case the client wants | |
461 | * to fall back to other boot methods. | |
462 | */ | |
463 | timeout = NFSROOT_TIMEOUT_MIN; | |
464 | for (try = 1; ; try++) { | |
465 | err = do_mount_root(root_dev, "nfs", | |
466 | root_mountflags, root_data); | |
467 | if (err == 0) | |
468 | return 1; | |
469 | if (try > NFSROOT_RETRY_MAX) | |
470 | break; | |
471 | ||
472 | /* Wait, in case the server refused us immediately */ | |
473 | ssleep(timeout); | |
474 | timeout <<= 1; | |
475 | if (timeout > NFSROOT_TIMEOUT_MAX) | |
476 | timeout = NFSROOT_TIMEOUT_MAX; | |
477 | } | |
478 | return 0; | |
1da177e4 LT |
479 | } |
480 | #endif | |
481 | ||
482 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
483 | void __init change_floppy(char *fmt, ...) | |
484 | { | |
485 | struct termios termios; | |
486 | char buf[80]; | |
487 | char c; | |
488 | int fd; | |
489 | va_list args; | |
490 | va_start(args, fmt); | |
491 | vsprintf(buf, fmt, args); | |
492 | va_end(args); | |
493 | fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); | |
494 | if (fd >= 0) { | |
495 | sys_ioctl(fd, FDEJECT, 0); | |
496 | sys_close(fd); | |
497 | } | |
498 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
499 | fd = sys_open("/dev/console", O_RDWR, 0); | |
500 | if (fd >= 0) { | |
501 | sys_ioctl(fd, TCGETS, (long)&termios); | |
502 | termios.c_lflag &= ~ICANON; | |
503 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
504 | sys_read(fd, &c, 1); | |
505 | termios.c_lflag |= ICANON; | |
506 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
507 | sys_close(fd); | |
508 | } | |
509 | } | |
510 | #endif | |
511 | ||
512 | void __init mount_root(void) | |
513 | { | |
514 | #ifdef CONFIG_ROOT_NFS | |
377485f6 | 515 | if (ROOT_DEV == Root_NFS) { |
1da177e4 LT |
516 | if (mount_nfs_root()) |
517 | return; | |
518 | ||
519 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
520 | ROOT_DEV = Root_FD0; | |
521 | } | |
522 | #endif | |
523 | #ifdef CONFIG_BLK_DEV_FD | |
524 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
525 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
526 | if (rd_doload==2) { | |
527 | if (rd_load_disk(1)) { | |
528 | ROOT_DEV = Root_RAM1; | |
529 | root_device_name = NULL; | |
530 | } | |
531 | } else | |
532 | change_floppy("root floppy"); | |
533 | } | |
534 | #endif | |
9361401e | 535 | #ifdef CONFIG_BLOCK |
c69e3c3a VPS |
536 | { |
537 | int err = create_dev("/dev/root", ROOT_DEV); | |
538 | ||
539 | if (err < 0) | |
540 | pr_emerg("Failed to create /dev/root: %d\n", err); | |
541 | mount_block_root("/dev/root", root_mountflags); | |
542 | } | |
9361401e | 543 | #endif |
1da177e4 LT |
544 | } |
545 | ||
546 | /* | |
547 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
548 | */ | |
549 | void __init prepare_namespace(void) | |
550 | { | |
551 | int is_floppy; | |
552 | ||
1da177e4 | 553 | if (root_delay) { |
ca75b4d8 | 554 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
1da177e4 LT |
555 | root_delay); |
556 | ssleep(root_delay); | |
557 | } | |
558 | ||
216773a7 AV |
559 | /* |
560 | * wait for the known devices to complete their probing | |
561 | * | |
562 | * Note: this is a potential source of long boot delays. | |
563 | * For example, it is not atypical to wait 5 seconds here | |
564 | * for the touchpad of a laptop to initialize. | |
565 | */ | |
566 | wait_for_device_probe(); | |
d779249e | 567 | |
1da177e4 LT |
568 | md_run_setup(); |
569 | ||
570 | if (saved_root_name[0]) { | |
571 | root_device_name = saved_root_name; | |
2d62f488 AH |
572 | if (!strncmp(root_device_name, "mtd", 3) || |
573 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
574 | mount_block_root(root_device_name, root_mountflags); |
575 | goto out; | |
576 | } | |
1da177e4 LT |
577 | ROOT_DEV = name_to_dev_t(root_device_name); |
578 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
579 | root_device_name += 5; | |
580 | } | |
581 | ||
1da177e4 LT |
582 | if (initrd_load()) |
583 | goto out; | |
584 | ||
cc1ed754 PO |
585 | /* wait for any asynchronous scanning to complete */ |
586 | if ((ROOT_DEV == 0) && root_wait) { | |
587 | printk(KERN_INFO "Waiting for root device %s...\n", | |
588 | saved_root_name); | |
589 | while (driver_probe_done() != 0 || | |
590 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
591 | msleep(100); | |
216773a7 | 592 | async_synchronize_full(); |
cc1ed754 PO |
593 | } |
594 | ||
595 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
596 | ||
1da177e4 LT |
597 | if (is_floppy && rd_doload && rd_load_disk(0)) |
598 | ROOT_DEV = Root_RAM0; | |
599 | ||
600 | mount_root(); | |
601 | out: | |
2b2af54a | 602 | devtmpfs_mount("dev"); |
1da177e4 | 603 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
c67e5382 | 604 | sys_chroot("."); |
1da177e4 | 605 | } |
57f150a5 | 606 | |
6e19eded | 607 | static bool is_tmpfs; |
57f150a5 RL |
608 | static struct dentry *rootfs_mount(struct file_system_type *fs_type, |
609 | int flags, const char *dev_name, void *data) | |
610 | { | |
611 | static unsigned long once; | |
6e19eded | 612 | void *fill = ramfs_fill_super; |
57f150a5 RL |
613 | |
614 | if (test_and_set_bit(0, &once)) | |
615 | return ERR_PTR(-ENODEV); | |
616 | ||
6e19eded RL |
617 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
618 | fill = shmem_fill_super; | |
619 | ||
620 | return mount_nodev(fs_type, flags, data, fill); | |
57f150a5 RL |
621 | } |
622 | ||
623 | static struct file_system_type rootfs_fs_type = { | |
624 | .name = "rootfs", | |
625 | .mount = rootfs_mount, | |
626 | .kill_sb = kill_litter_super, | |
627 | }; | |
628 | ||
629 | int __init init_rootfs(void) | |
630 | { | |
631 | int err = register_filesystem(&rootfs_fs_type); | |
632 | ||
633 | if (err) | |
634 | return err; | |
635 | ||
6e19eded RL |
636 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
637 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { | |
16203a7a | 638 | err = shmem_init(); |
6e19eded RL |
639 | is_tmpfs = true; |
640 | } else { | |
16203a7a | 641 | err = init_ramfs_fs(); |
6e19eded | 642 | } |
16203a7a | 643 | |
57f150a5 RL |
644 | if (err) |
645 | unregister_filesystem(&rootfs_fs_type); | |
646 | ||
647 | return err; | |
648 | } |