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Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/module.h> |
2 | #include <linux/sched.h> | |
3 | #include <linux/ctype.h> | |
4 | #include <linux/fd.h> | |
5 | #include <linux/tty.h> | |
6 | #include <linux/suspend.h> | |
7 | #include <linux/root_dev.h> | |
8 | #include <linux/security.h> | |
9 | #include <linux/delay.h> | |
dd2a345f | 10 | #include <linux/genhd.h> |
d53d9f16 | 11 | #include <linux/mount.h> |
d779249e | 12 | #include <linux/device.h> |
46595390 | 13 | #include <linux/init.h> |
011e3fcd | 14 | #include <linux/fs.h> |
82c8253a | 15 | #include <linux/initrd.h> |
22a9d645 | 16 | #include <linux/async.h> |
5ad4e53b | 17 | #include <linux/fs_struct.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
57f150a5 | 19 | #include <linux/ramfs.h> |
16203a7a | 20 | #include <linux/shmem_fs.h> |
1da177e4 LT |
21 | |
22 | #include <linux/nfs_fs.h> | |
23 | #include <linux/nfs_fs_sb.h> | |
24 | #include <linux/nfs_mount.h> | |
25 | ||
26 | #include "do_mounts.h" | |
27 | ||
1da177e4 LT |
28 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
29 | ||
9b04c997 | 30 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 31 | static char * __initdata root_device_name; |
1da177e4 | 32 | static char __initdata saved_root_name[64]; |
79975f13 | 33 | static int root_wait; |
1da177e4 | 34 | |
1da177e4 LT |
35 | dev_t ROOT_DEV; |
36 | ||
1da177e4 LT |
37 | static int __init load_ramdisk(char *str) |
38 | { | |
39 | rd_doload = simple_strtol(str,NULL,0) & 3; | |
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 | ||
6d0aed7a | 63 | #ifdef CONFIG_BLOCK |
1ad7e899 SW |
64 | struct uuidcmp { |
65 | const char *uuid; | |
66 | int len; | |
67 | }; | |
68 | ||
b5af921e WD |
69 | /** |
70 | * match_dev_by_uuid - callback for finding a partition using its uuid | |
71 | * @dev: device passed in by the caller | |
1ad7e899 | 72 | * @data: opaque pointer to the desired struct uuidcmp to match |
b5af921e WD |
73 | * |
74 | * Returns 1 if the device matches, and 0 otherwise. | |
75 | */ | |
9f3b795a | 76 | static int match_dev_by_uuid(struct device *dev, const void *data) |
b5af921e | 77 | { |
9f3b795a | 78 | const struct uuidcmp *cmp = data; |
b5af921e WD |
79 | struct hd_struct *part = dev_to_part(dev); |
80 | ||
81 | if (!part->info) | |
82 | goto no_match; | |
83 | ||
1ad7e899 SW |
84 | if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) |
85 | goto no_match; | |
b5af921e WD |
86 | |
87 | return 1; | |
88 | no_match: | |
89 | return 0; | |
90 | } | |
91 | ||
92 | ||
93 | /** | |
94 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | |
a68b3108 | 95 | * @uuid_str: char array containing ascii UUID |
b5af921e WD |
96 | * |
97 | * The function will return the first partition which contains a matching | |
98 | * UUID value in its partition_meta_info struct. This does not search | |
99 | * by filesystem UUIDs. | |
100 | * | |
a68b3108 | 101 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
79975f13 WD |
102 | * extracted and used as an offset from the partition identified by the UUID. |
103 | * | |
b5af921e WD |
104 | * Returns the matching dev_t on success or 0 on failure. |
105 | */ | |
1ad7e899 | 106 | static dev_t devt_from_partuuid(const char *uuid_str) |
b5af921e WD |
107 | { |
108 | dev_t res = 0; | |
1ad7e899 | 109 | struct uuidcmp cmp; |
b5af921e | 110 | struct device *dev = NULL; |
79975f13 WD |
111 | struct gendisk *disk; |
112 | struct hd_struct *part; | |
113 | int offset = 0; | |
283f8fc0 SW |
114 | bool clear_root_wait = false; |
115 | char *slash; | |
79975f13 | 116 | |
1ad7e899 | 117 | cmp.uuid = uuid_str; |
1ad7e899 | 118 | |
283f8fc0 | 119 | slash = strchr(uuid_str, '/'); |
79975f13 | 120 | /* Check for optional partition number offset attributes. */ |
283f8fc0 | 121 | if (slash) { |
79975f13 WD |
122 | char c = 0; |
123 | /* Explicitly fail on poor PARTUUID syntax. */ | |
283f8fc0 SW |
124 | if (sscanf(slash + 1, |
125 | "PARTNROFF=%d%c", &offset, &c) != 1) { | |
126 | clear_root_wait = true; | |
79975f13 WD |
127 | goto done; |
128 | } | |
283f8fc0 SW |
129 | cmp.len = slash - uuid_str; |
130 | } else { | |
131 | cmp.len = strlen(uuid_str); | |
132 | } | |
133 | ||
134 | if (!cmp.len) { | |
135 | clear_root_wait = true; | |
136 | goto done; | |
79975f13 | 137 | } |
b5af921e | 138 | |
1ad7e899 SW |
139 | dev = class_find_device(&block_class, NULL, &cmp, |
140 | &match_dev_by_uuid); | |
b5af921e WD |
141 | if (!dev) |
142 | goto done; | |
143 | ||
144 | res = dev->devt; | |
b5af921e | 145 | |
79975f13 WD |
146 | /* Attempt to find the partition by offset. */ |
147 | if (!offset) | |
148 | goto no_offset; | |
149 | ||
150 | res = 0; | |
151 | disk = part_to_disk(dev_to_part(dev)); | |
152 | part = disk_get_part(disk, dev_to_part(dev)->partno + offset); | |
153 | if (part) { | |
154 | res = part_devt(part); | |
155 | put_device(part_to_dev(part)); | |
156 | } | |
157 | ||
158 | no_offset: | |
159 | put_device(dev); | |
b5af921e | 160 | done: |
283f8fc0 SW |
161 | if (clear_root_wait) { |
162 | pr_err("VFS: PARTUUID= is invalid.\n" | |
163 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); | |
164 | if (root_wait) | |
165 | pr_err("Disabling rootwait; root= is invalid.\n"); | |
166 | root_wait = 0; | |
167 | } | |
b5af921e WD |
168 | return res; |
169 | } | |
6d0aed7a | 170 | #endif |
b5af921e | 171 | |
1da177e4 LT |
172 | /* |
173 | * Convert a name into device number. We accept the following variants: | |
174 | * | |
0bf37ae4 PM |
175 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
176 | * no leading 0x, for example b302. | |
1da177e4 LT |
177 | * 2) /dev/nfs represents Root_NFS (0xff) |
178 | * 3) /dev/<disk_name> represents the device number of disk | |
179 | * 4) /dev/<disk_name><decimal> represents the device number | |
180 | * of partition - device number of disk plus the partition number | |
181 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
182 | * used when disk name of partitioned disk ends on a digit. | |
b5af921e WD |
183 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
184 | * unique id of a partition if the partition table provides it. | |
d33b98fc SW |
185 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
186 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- | |
187 | * filled hex representation of the 32-bit "NT disk signature", and PP | |
188 | * is a zero-filled hex representation of the 1-based partition number. | |
79975f13 WD |
189 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
190 | * a partition with a known unique id. | |
6c251611 SC |
191 | * 8) <major>:<minor> major and minor number of the device separated by |
192 | * a colon. | |
1da177e4 | 193 | * |
edfaa7c3 KS |
194 | * If name doesn't have fall into the categories above, we return (0,0). |
195 | * block_class is used to check if something is a disk name. If the disk | |
196 | * name contains slashes, the device name has them replaced with | |
197 | * bangs. | |
1da177e4 LT |
198 | */ |
199 | ||
e6e20a7a | 200 | dev_t name_to_dev_t(const char *name) |
1da177e4 LT |
201 | { |
202 | char s[32]; | |
203 | char *p; | |
204 | dev_t res = 0; | |
30f2f0eb | 205 | int part; |
1da177e4 | 206 | |
6d0aed7a | 207 | #ifdef CONFIG_BLOCK |
b5af921e WD |
208 | if (strncmp(name, "PARTUUID=", 9) == 0) { |
209 | name += 9; | |
b5af921e WD |
210 | res = devt_from_partuuid(name); |
211 | if (!res) | |
212 | goto fail; | |
213 | goto done; | |
214 | } | |
6d0aed7a | 215 | #endif |
b5af921e | 216 | |
1da177e4 | 217 | if (strncmp(name, "/dev/", 5) != 0) { |
cb31ef48 | 218 | unsigned maj, min, offset; |
283e7ad0 | 219 | char dummy; |
1da177e4 | 220 | |
cb31ef48 CY |
221 | if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) || |
222 | (sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) { | |
1da177e4 LT |
223 | res = MKDEV(maj, min); |
224 | if (maj != MAJOR(res) || min != MINOR(res)) | |
225 | goto fail; | |
226 | } else { | |
227 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
228 | if (*p) | |
229 | goto fail; | |
230 | } | |
231 | goto done; | |
232 | } | |
edfaa7c3 | 233 | |
1da177e4 LT |
234 | name += 5; |
235 | res = Root_NFS; | |
236 | if (strcmp(name, "nfs") == 0) | |
237 | goto done; | |
238 | res = Root_RAM0; | |
239 | if (strcmp(name, "ram") == 0) | |
240 | goto done; | |
241 | ||
242 | if (strlen(name) > 31) | |
243 | goto fail; | |
244 | strcpy(s, name); | |
245 | for (p = s; *p; p++) | |
246 | if (*p == '/') | |
247 | *p = '!'; | |
30f2f0eb KS |
248 | res = blk_lookup_devt(s, 0); |
249 | if (res) | |
250 | goto done; | |
251 | ||
252 | /* | |
25985edc | 253 | * try non-existent, but valid partition, which may only exist |
30f2f0eb KS |
254 | * after revalidating the disk, like partitioned md devices |
255 | */ | |
256 | while (p > s && isdigit(p[-1])) | |
257 | p--; | |
258 | if (p == s || !*p || *p == '0') | |
259 | goto fail; | |
260 | ||
261 | /* try disk name without <part number> */ | |
262 | part = simple_strtoul(p, NULL, 10); | |
263 | *p = '\0'; | |
264 | res = blk_lookup_devt(s, part); | |
265 | if (res) | |
266 | goto done; | |
267 | ||
268 | /* try disk name without p<part number> */ | |
269 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
270 | goto fail; | |
271 | p[-1] = '\0'; | |
272 | res = blk_lookup_devt(s, part); | |
1da177e4 LT |
273 | if (res) |
274 | goto done; | |
275 | ||
edfaa7c3 KS |
276 | fail: |
277 | return 0; | |
1da177e4 | 278 | done: |
1da177e4 | 279 | return res; |
1da177e4 | 280 | } |
e6e20a7a | 281 | EXPORT_SYMBOL_GPL(name_to_dev_t); |
1da177e4 LT |
282 | |
283 | static int __init root_dev_setup(char *line) | |
284 | { | |
285 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
286 | return 1; | |
287 | } | |
288 | ||
289 | __setup("root=", root_dev_setup); | |
290 | ||
cc1ed754 PO |
291 | static int __init rootwait_setup(char *str) |
292 | { | |
293 | if (*str) | |
294 | return 0; | |
295 | root_wait = 1; | |
296 | return 1; | |
297 | } | |
298 | ||
299 | __setup("rootwait", rootwait_setup); | |
300 | ||
1da177e4 LT |
301 | static char * __initdata root_mount_data; |
302 | static int __init root_data_setup(char *str) | |
303 | { | |
304 | root_mount_data = str; | |
305 | return 1; | |
306 | } | |
307 | ||
308 | static char * __initdata root_fs_names; | |
309 | static int __init fs_names_setup(char *str) | |
310 | { | |
311 | root_fs_names = str; | |
312 | return 1; | |
313 | } | |
314 | ||
315 | static unsigned int __initdata root_delay; | |
316 | static int __init root_delay_setup(char *str) | |
317 | { | |
318 | root_delay = simple_strtoul(str, NULL, 0); | |
319 | return 1; | |
320 | } | |
321 | ||
322 | __setup("rootflags=", root_data_setup); | |
323 | __setup("rootfstype=", fs_names_setup); | |
324 | __setup("rootdelay=", root_delay_setup); | |
325 | ||
326 | static void __init get_fs_names(char *page) | |
327 | { | |
328 | char *s = page; | |
329 | ||
330 | if (root_fs_names) { | |
331 | strcpy(page, root_fs_names); | |
332 | while (*s++) { | |
333 | if (s[-1] == ',') | |
334 | s[-1] = '\0'; | |
335 | } | |
336 | } else { | |
337 | int len = get_filesystem_list(page); | |
338 | char *p, *next; | |
339 | ||
340 | page[len] = '\0'; | |
341 | for (p = page-1; p; p = next) { | |
342 | next = strchr(++p, '\n'); | |
343 | if (*p++ != '\t') | |
344 | continue; | |
345 | while ((*s++ = *p++) != '\n') | |
346 | ; | |
347 | s[-1] = '\0'; | |
348 | } | |
349 | } | |
350 | *s = '\0'; | |
351 | } | |
352 | ||
353 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
354 | { | |
d8c9584e | 355 | struct super_block *s; |
312db1aa | 356 | int err = ksys_mount(name, "/root", fs, flags, data); |
1da177e4 LT |
357 | if (err) |
358 | return err; | |
359 | ||
447016e9 | 360 | ksys_chdir("/root"); |
d8c9584e AV |
361 | s = current->fs->pwd.dentry->d_sb; |
362 | ROOT_DEV = s->s_dev; | |
80cdc6da MSB |
363 | printk(KERN_INFO |
364 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", | |
d8c9584e | 365 | s->s_type->name, |
bc98a42c | 366 | sb_rdonly(s) ? " readonly" : "", |
d8c9584e | 367 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
371 | void __init mount_block_root(char *name, int flags) | |
372 | { | |
75f296d9 | 373 | struct page *page = alloc_page(GFP_KERNEL); |
a608ca21 | 374 | char *fs_names = page_address(page); |
1da177e4 | 375 | char *p; |
9361401e | 376 | #ifdef CONFIG_BLOCK |
1da177e4 | 377 | char b[BDEVNAME_SIZE]; |
9361401e DH |
378 | #else |
379 | const char *b = name; | |
380 | #endif | |
1da177e4 LT |
381 | |
382 | get_fs_names(fs_names); | |
383 | retry: | |
384 | for (p = fs_names; *p; p += strlen(p)+1) { | |
385 | int err = do_mount_root(name, p, flags, root_mount_data); | |
386 | switch (err) { | |
387 | case 0: | |
388 | goto out; | |
389 | case -EACCES: | |
1da177e4 LT |
390 | case -EINVAL: |
391 | continue; | |
392 | } | |
393 | /* | |
394 | * Allow the user to distinguish between failed sys_open | |
395 | * and bad superblock on root device. | |
dd2a345f | 396 | * and give them a list of the available devices |
1da177e4 | 397 | */ |
9361401e | 398 | #ifdef CONFIG_BLOCK |
1da177e4 | 399 | __bdevname(ROOT_DEV, b); |
9361401e | 400 | #endif |
0e0cb892 BW |
401 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
402 | root_device_name, b, err); | |
dd2a345f | 403 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 404 | |
dd2a345f | 405 | printk_all_partitions(); |
55dc7db7 TH |
406 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
407 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
408 | "explicit textual name for \"root=\" boot option.\n"); | |
409 | #endif | |
1da177e4 LT |
410 | panic("VFS: Unable to mount root fs on %s", b); |
411 | } | |
e462ec50 DH |
412 | if (!(flags & SB_RDONLY)) { |
413 | flags |= SB_RDONLY; | |
10975933 MS |
414 | goto retry; |
415 | } | |
be6e028b | 416 | |
dd2a345f DG |
417 | printk("List of all partitions:\n"); |
418 | printk_all_partitions(); | |
be6e028b AW |
419 | printk("No filesystem could mount root, tried: "); |
420 | for (p = fs_names; *p; p += strlen(p)+1) | |
421 | printk(" %s", p); | |
422 | printk("\n"); | |
9361401e DH |
423 | #ifdef CONFIG_BLOCK |
424 | __bdevname(ROOT_DEV, b); | |
425 | #endif | |
426 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 | 427 | out: |
a608ca21 | 428 | put_page(page); |
1da177e4 LT |
429 | } |
430 | ||
431 | #ifdef CONFIG_ROOT_NFS | |
43717c7d CL |
432 | |
433 | #define NFSROOT_TIMEOUT_MIN 5 | |
434 | #define NFSROOT_TIMEOUT_MAX 30 | |
435 | #define NFSROOT_RETRY_MAX 5 | |
436 | ||
1da177e4 LT |
437 | static int __init mount_nfs_root(void) |
438 | { | |
56463e50 | 439 | char *root_dev, *root_data; |
43717c7d CL |
440 | unsigned int timeout; |
441 | int try, err; | |
1da177e4 | 442 | |
43717c7d CL |
443 | err = nfs_root_data(&root_dev, &root_data); |
444 | if (err != 0) | |
56463e50 | 445 | return 0; |
43717c7d CL |
446 | |
447 | /* | |
448 | * The server or network may not be ready, so try several | |
449 | * times. Stop after a few tries in case the client wants | |
450 | * to fall back to other boot methods. | |
451 | */ | |
452 | timeout = NFSROOT_TIMEOUT_MIN; | |
453 | for (try = 1; ; try++) { | |
454 | err = do_mount_root(root_dev, "nfs", | |
455 | root_mountflags, root_data); | |
456 | if (err == 0) | |
457 | return 1; | |
458 | if (try > NFSROOT_RETRY_MAX) | |
459 | break; | |
460 | ||
461 | /* Wait, in case the server refused us immediately */ | |
462 | ssleep(timeout); | |
463 | timeout <<= 1; | |
464 | if (timeout > NFSROOT_TIMEOUT_MAX) | |
465 | timeout = NFSROOT_TIMEOUT_MAX; | |
466 | } | |
467 | return 0; | |
1da177e4 LT |
468 | } |
469 | #endif | |
470 | ||
471 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
472 | void __init change_floppy(char *fmt, ...) | |
473 | { | |
474 | struct termios termios; | |
475 | char buf[80]; | |
476 | char c; | |
477 | int fd; | |
478 | va_list args; | |
479 | va_start(args, fmt); | |
480 | vsprintf(buf, fmt, args); | |
481 | va_end(args); | |
bae217ea | 482 | fd = ksys_open("/dev/root", O_RDWR | O_NDELAY, 0); |
1da177e4 | 483 | if (fd >= 0) { |
cbb60b92 | 484 | ksys_ioctl(fd, FDEJECT, 0); |
2ca2a09d | 485 | ksys_close(fd); |
1da177e4 LT |
486 | } |
487 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
bae217ea | 488 | fd = ksys_open("/dev/console", O_RDWR, 0); |
1da177e4 | 489 | if (fd >= 0) { |
cbb60b92 | 490 | ksys_ioctl(fd, TCGETS, (long)&termios); |
1da177e4 | 491 | termios.c_lflag &= ~ICANON; |
cbb60b92 | 492 | ksys_ioctl(fd, TCSETSF, (long)&termios); |
3ce4a7bf | 493 | ksys_read(fd, &c, 1); |
1da177e4 | 494 | termios.c_lflag |= ICANON; |
cbb60b92 | 495 | ksys_ioctl(fd, TCSETSF, (long)&termios); |
2ca2a09d | 496 | ksys_close(fd); |
1da177e4 LT |
497 | } |
498 | } | |
499 | #endif | |
500 | ||
501 | void __init mount_root(void) | |
502 | { | |
503 | #ifdef CONFIG_ROOT_NFS | |
377485f6 | 504 | if (ROOT_DEV == Root_NFS) { |
1da177e4 LT |
505 | if (mount_nfs_root()) |
506 | return; | |
507 | ||
508 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
509 | ROOT_DEV = Root_FD0; | |
510 | } | |
511 | #endif | |
512 | #ifdef CONFIG_BLK_DEV_FD | |
513 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
514 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
515 | if (rd_doload==2) { | |
516 | if (rd_load_disk(1)) { | |
517 | ROOT_DEV = Root_RAM1; | |
518 | root_device_name = NULL; | |
519 | } | |
520 | } else | |
521 | change_floppy("root floppy"); | |
522 | } | |
523 | #endif | |
9361401e | 524 | #ifdef CONFIG_BLOCK |
c69e3c3a VPS |
525 | { |
526 | int err = create_dev("/dev/root", ROOT_DEV); | |
527 | ||
528 | if (err < 0) | |
529 | pr_emerg("Failed to create /dev/root: %d\n", err); | |
530 | mount_block_root("/dev/root", root_mountflags); | |
531 | } | |
9361401e | 532 | #endif |
1da177e4 LT |
533 | } |
534 | ||
535 | /* | |
536 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
537 | */ | |
538 | void __init prepare_namespace(void) | |
539 | { | |
540 | int is_floppy; | |
541 | ||
1da177e4 | 542 | if (root_delay) { |
ca75b4d8 | 543 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
1da177e4 LT |
544 | root_delay); |
545 | ssleep(root_delay); | |
546 | } | |
547 | ||
216773a7 AV |
548 | /* |
549 | * wait for the known devices to complete their probing | |
550 | * | |
551 | * Note: this is a potential source of long boot delays. | |
552 | * For example, it is not atypical to wait 5 seconds here | |
553 | * for the touchpad of a laptop to initialize. | |
554 | */ | |
555 | wait_for_device_probe(); | |
d779249e | 556 | |
1da177e4 LT |
557 | md_run_setup(); |
558 | ||
559 | if (saved_root_name[0]) { | |
560 | root_device_name = saved_root_name; | |
2d62f488 AH |
561 | if (!strncmp(root_device_name, "mtd", 3) || |
562 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
563 | mount_block_root(root_device_name, root_mountflags); |
564 | goto out; | |
565 | } | |
1da177e4 LT |
566 | ROOT_DEV = name_to_dev_t(root_device_name); |
567 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
568 | root_device_name += 5; | |
569 | } | |
570 | ||
1da177e4 LT |
571 | if (initrd_load()) |
572 | goto out; | |
573 | ||
cc1ed754 PO |
574 | /* wait for any asynchronous scanning to complete */ |
575 | if ((ROOT_DEV == 0) && root_wait) { | |
576 | printk(KERN_INFO "Waiting for root device %s...\n", | |
577 | saved_root_name); | |
578 | while (driver_probe_done() != 0 || | |
579 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
39a0e975 | 580 | msleep(5); |
216773a7 | 581 | async_synchronize_full(); |
cc1ed754 PO |
582 | } |
583 | ||
584 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
585 | ||
1da177e4 LT |
586 | if (is_floppy && rd_doload && rd_load_disk(0)) |
587 | ROOT_DEV = Root_RAM0; | |
588 | ||
589 | mount_root(); | |
590 | out: | |
2b2af54a | 591 | devtmpfs_mount("dev"); |
312db1aa | 592 | ksys_mount(".", "/", NULL, MS_MOVE, NULL); |
a16fe33a | 593 | ksys_chroot("."); |
1da177e4 | 594 | } |
57f150a5 | 595 | |
6e19eded | 596 | static bool is_tmpfs; |
57f150a5 RL |
597 | static struct dentry *rootfs_mount(struct file_system_type *fs_type, |
598 | int flags, const char *dev_name, void *data) | |
599 | { | |
600 | static unsigned long once; | |
6e19eded | 601 | void *fill = ramfs_fill_super; |
57f150a5 RL |
602 | |
603 | if (test_and_set_bit(0, &once)) | |
604 | return ERR_PTR(-ENODEV); | |
605 | ||
6e19eded RL |
606 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
607 | fill = shmem_fill_super; | |
608 | ||
609 | return mount_nodev(fs_type, flags, data, fill); | |
57f150a5 RL |
610 | } |
611 | ||
612 | static struct file_system_type rootfs_fs_type = { | |
613 | .name = "rootfs", | |
614 | .mount = rootfs_mount, | |
615 | .kill_sb = kill_litter_super, | |
616 | }; | |
617 | ||
618 | int __init init_rootfs(void) | |
619 | { | |
620 | int err = register_filesystem(&rootfs_fs_type); | |
621 | ||
622 | if (err) | |
623 | return err; | |
624 | ||
6e19eded RL |
625 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
626 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { | |
16203a7a | 627 | err = shmem_init(); |
6e19eded RL |
628 | is_tmpfs = true; |
629 | } else { | |
16203a7a | 630 | err = init_ramfs_fs(); |
6e19eded | 631 | } |
16203a7a | 632 | |
57f150a5 RL |
633 | if (err) |
634 | unregister_filesystem(&rootfs_fs_type); | |
635 | ||
636 | return err; | |
637 | } |