Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
19 | |
20 | #include <linux/nfs_fs.h> | |
21 | #include <linux/nfs_fs_sb.h> | |
22 | #include <linux/nfs_mount.h> | |
23 | ||
24 | #include "do_mounts.h" | |
25 | ||
1da177e4 LT |
26 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
27 | ||
9b04c997 | 28 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 29 | static char * __initdata root_device_name; |
1da177e4 | 30 | static char __initdata saved_root_name[64]; |
79975f13 | 31 | static int root_wait; |
1da177e4 | 32 | |
1da177e4 LT |
33 | dev_t ROOT_DEV; |
34 | ||
1da177e4 LT |
35 | static int __init load_ramdisk(char *str) |
36 | { | |
37 | rd_doload = simple_strtol(str,NULL,0) & 3; | |
38 | return 1; | |
39 | } | |
40 | __setup("load_ramdisk=", load_ramdisk); | |
41 | ||
42 | static int __init readonly(char *str) | |
43 | { | |
44 | if (*str) | |
45 | return 0; | |
46 | root_mountflags |= MS_RDONLY; | |
47 | return 1; | |
48 | } | |
49 | ||
50 | static int __init readwrite(char *str) | |
51 | { | |
52 | if (*str) | |
53 | return 0; | |
54 | root_mountflags &= ~MS_RDONLY; | |
55 | return 1; | |
56 | } | |
57 | ||
58 | __setup("ro", readonly); | |
59 | __setup("rw", readwrite); | |
60 | ||
6d0aed7a | 61 | #ifdef CONFIG_BLOCK |
b5af921e WD |
62 | /** |
63 | * match_dev_by_uuid - callback for finding a partition using its uuid | |
64 | * @dev: device passed in by the caller | |
65 | * @data: opaque pointer to a 36 byte char array with a UUID | |
66 | * | |
67 | * Returns 1 if the device matches, and 0 otherwise. | |
68 | */ | |
38b6f45a | 69 | static int match_dev_by_uuid(struct device *dev, void *data) |
b5af921e WD |
70 | { |
71 | u8 *uuid = data; | |
72 | struct hd_struct *part = dev_to_part(dev); | |
73 | ||
74 | if (!part->info) | |
75 | goto no_match; | |
76 | ||
77 | if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid))) | |
78 | goto no_match; | |
79 | ||
80 | return 1; | |
81 | no_match: | |
82 | return 0; | |
83 | } | |
84 | ||
85 | ||
86 | /** | |
87 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | |
79975f13 | 88 | * @uuid: min 36 byte char array containing a hex ascii UUID |
b5af921e WD |
89 | * |
90 | * The function will return the first partition which contains a matching | |
91 | * UUID value in its partition_meta_info struct. This does not search | |
92 | * by filesystem UUIDs. | |
93 | * | |
79975f13 WD |
94 | * If @uuid is followed by a "/PARTNROFF=%d", then the number will be |
95 | * extracted and used as an offset from the partition identified by the UUID. | |
96 | * | |
b5af921e WD |
97 | * Returns the matching dev_t on success or 0 on failure. |
98 | */ | |
a1cf11d8 | 99 | static dev_t devt_from_partuuid(char *uuid_str) |
b5af921e WD |
100 | { |
101 | dev_t res = 0; | |
102 | struct device *dev = NULL; | |
103 | u8 uuid[16]; | |
79975f13 WD |
104 | struct gendisk *disk; |
105 | struct hd_struct *part; | |
106 | int offset = 0; | |
107 | ||
108 | if (strlen(uuid_str) < 36) | |
109 | goto done; | |
110 | ||
111 | /* Check for optional partition number offset attributes. */ | |
112 | if (uuid_str[36]) { | |
113 | char c = 0; | |
114 | /* Explicitly fail on poor PARTUUID syntax. */ | |
115 | if (sscanf(&uuid_str[36], | |
116 | "/PARTNROFF=%d%c", &offset, &c) != 1) { | |
117 | printk(KERN_ERR "VFS: PARTUUID= is invalid.\n" | |
118 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); | |
119 | if (root_wait) | |
120 | printk(KERN_ERR | |
121 | "Disabling rootwait; root= is invalid.\n"); | |
122 | root_wait = 0; | |
123 | goto done; | |
124 | } | |
125 | } | |
b5af921e WD |
126 | |
127 | /* Pack the requested UUID in the expected format. */ | |
128 | part_pack_uuid(uuid_str, uuid); | |
129 | ||
130 | dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid); | |
131 | if (!dev) | |
132 | goto done; | |
133 | ||
134 | res = dev->devt; | |
b5af921e | 135 | |
79975f13 WD |
136 | /* Attempt to find the partition by offset. */ |
137 | if (!offset) | |
138 | goto no_offset; | |
139 | ||
140 | res = 0; | |
141 | disk = part_to_disk(dev_to_part(dev)); | |
142 | part = disk_get_part(disk, dev_to_part(dev)->partno + offset); | |
143 | if (part) { | |
144 | res = part_devt(part); | |
145 | put_device(part_to_dev(part)); | |
146 | } | |
147 | ||
148 | no_offset: | |
149 | put_device(dev); | |
b5af921e WD |
150 | done: |
151 | return res; | |
152 | } | |
6d0aed7a | 153 | #endif |
b5af921e | 154 | |
1da177e4 LT |
155 | /* |
156 | * Convert a name into device number. We accept the following variants: | |
157 | * | |
158 | * 1) device number in hexadecimal represents itself | |
159 | * 2) /dev/nfs represents Root_NFS (0xff) | |
160 | * 3) /dev/<disk_name> represents the device number of disk | |
161 | * 4) /dev/<disk_name><decimal> represents the device number | |
162 | * of partition - device number of disk plus the partition number | |
163 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
164 | * used when disk name of partitioned disk ends on a digit. | |
b5af921e WD |
165 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
166 | * unique id of a partition if the partition table provides it. | |
79975f13 WD |
167 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
168 | * a partition with a known unique id. | |
1da177e4 | 169 | * |
edfaa7c3 KS |
170 | * If name doesn't have fall into the categories above, we return (0,0). |
171 | * block_class is used to check if something is a disk name. If the disk | |
172 | * name contains slashes, the device name has them replaced with | |
173 | * bangs. | |
1da177e4 LT |
174 | */ |
175 | ||
176 | dev_t name_to_dev_t(char *name) | |
177 | { | |
178 | char s[32]; | |
179 | char *p; | |
180 | dev_t res = 0; | |
30f2f0eb | 181 | int part; |
1da177e4 | 182 | |
6d0aed7a | 183 | #ifdef CONFIG_BLOCK |
b5af921e WD |
184 | if (strncmp(name, "PARTUUID=", 9) == 0) { |
185 | name += 9; | |
b5af921e WD |
186 | res = devt_from_partuuid(name); |
187 | if (!res) | |
188 | goto fail; | |
189 | goto done; | |
190 | } | |
6d0aed7a | 191 | #endif |
b5af921e | 192 | |
1da177e4 LT |
193 | if (strncmp(name, "/dev/", 5) != 0) { |
194 | unsigned maj, min; | |
195 | ||
196 | if (sscanf(name, "%u:%u", &maj, &min) == 2) { | |
197 | res = MKDEV(maj, min); | |
198 | if (maj != MAJOR(res) || min != MINOR(res)) | |
199 | goto fail; | |
200 | } else { | |
201 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
202 | if (*p) | |
203 | goto fail; | |
204 | } | |
205 | goto done; | |
206 | } | |
edfaa7c3 | 207 | |
1da177e4 LT |
208 | name += 5; |
209 | res = Root_NFS; | |
210 | if (strcmp(name, "nfs") == 0) | |
211 | goto done; | |
212 | res = Root_RAM0; | |
213 | if (strcmp(name, "ram") == 0) | |
214 | goto done; | |
215 | ||
216 | if (strlen(name) > 31) | |
217 | goto fail; | |
218 | strcpy(s, name); | |
219 | for (p = s; *p; p++) | |
220 | if (*p == '/') | |
221 | *p = '!'; | |
30f2f0eb KS |
222 | res = blk_lookup_devt(s, 0); |
223 | if (res) | |
224 | goto done; | |
225 | ||
226 | /* | |
25985edc | 227 | * try non-existent, but valid partition, which may only exist |
30f2f0eb KS |
228 | * after revalidating the disk, like partitioned md devices |
229 | */ | |
230 | while (p > s && isdigit(p[-1])) | |
231 | p--; | |
232 | if (p == s || !*p || *p == '0') | |
233 | goto fail; | |
234 | ||
235 | /* try disk name without <part number> */ | |
236 | part = simple_strtoul(p, NULL, 10); | |
237 | *p = '\0'; | |
238 | res = blk_lookup_devt(s, part); | |
239 | if (res) | |
240 | goto done; | |
241 | ||
242 | /* try disk name without p<part number> */ | |
243 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
244 | goto fail; | |
245 | p[-1] = '\0'; | |
246 | res = blk_lookup_devt(s, part); | |
1da177e4 LT |
247 | if (res) |
248 | goto done; | |
249 | ||
edfaa7c3 KS |
250 | fail: |
251 | return 0; | |
1da177e4 | 252 | done: |
1da177e4 | 253 | return res; |
1da177e4 LT |
254 | } |
255 | ||
256 | static int __init root_dev_setup(char *line) | |
257 | { | |
258 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
259 | return 1; | |
260 | } | |
261 | ||
262 | __setup("root=", root_dev_setup); | |
263 | ||
cc1ed754 PO |
264 | static int __init rootwait_setup(char *str) |
265 | { | |
266 | if (*str) | |
267 | return 0; | |
268 | root_wait = 1; | |
269 | return 1; | |
270 | } | |
271 | ||
272 | __setup("rootwait", rootwait_setup); | |
273 | ||
1da177e4 LT |
274 | static char * __initdata root_mount_data; |
275 | static int __init root_data_setup(char *str) | |
276 | { | |
277 | root_mount_data = str; | |
278 | return 1; | |
279 | } | |
280 | ||
281 | static char * __initdata root_fs_names; | |
282 | static int __init fs_names_setup(char *str) | |
283 | { | |
284 | root_fs_names = str; | |
285 | return 1; | |
286 | } | |
287 | ||
288 | static unsigned int __initdata root_delay; | |
289 | static int __init root_delay_setup(char *str) | |
290 | { | |
291 | root_delay = simple_strtoul(str, NULL, 0); | |
292 | return 1; | |
293 | } | |
294 | ||
295 | __setup("rootflags=", root_data_setup); | |
296 | __setup("rootfstype=", fs_names_setup); | |
297 | __setup("rootdelay=", root_delay_setup); | |
298 | ||
299 | static void __init get_fs_names(char *page) | |
300 | { | |
301 | char *s = page; | |
302 | ||
303 | if (root_fs_names) { | |
304 | strcpy(page, root_fs_names); | |
305 | while (*s++) { | |
306 | if (s[-1] == ',') | |
307 | s[-1] = '\0'; | |
308 | } | |
309 | } else { | |
310 | int len = get_filesystem_list(page); | |
311 | char *p, *next; | |
312 | ||
313 | page[len] = '\0'; | |
314 | for (p = page-1; p; p = next) { | |
315 | next = strchr(++p, '\n'); | |
316 | if (*p++ != '\t') | |
317 | continue; | |
318 | while ((*s++ = *p++) != '\n') | |
319 | ; | |
320 | s[-1] = '\0'; | |
321 | } | |
322 | } | |
323 | *s = '\0'; | |
324 | } | |
325 | ||
326 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
327 | { | |
d8c9584e | 328 | struct super_block *s; |
1da177e4 LT |
329 | int err = sys_mount(name, "/root", fs, flags, data); |
330 | if (err) | |
331 | return err; | |
332 | ||
562f5e63 | 333 | sys_chdir((const char __user __force *)"/root"); |
d8c9584e AV |
334 | s = current->fs->pwd.dentry->d_sb; |
335 | ROOT_DEV = s->s_dev; | |
80cdc6da MSB |
336 | printk(KERN_INFO |
337 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", | |
d8c9584e AV |
338 | s->s_type->name, |
339 | s->s_flags & MS_RDONLY ? " readonly" : "", | |
340 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); | |
1da177e4 LT |
341 | return 0; |
342 | } | |
343 | ||
344 | void __init mount_block_root(char *name, int flags) | |
345 | { | |
3b5c760e VN |
346 | char *fs_names = __getname_gfp(GFP_KERNEL |
347 | | __GFP_NOTRACK_FALSE_POSITIVE); | |
1da177e4 | 348 | char *p; |
9361401e | 349 | #ifdef CONFIG_BLOCK |
1da177e4 | 350 | char b[BDEVNAME_SIZE]; |
9361401e DH |
351 | #else |
352 | const char *b = name; | |
353 | #endif | |
1da177e4 LT |
354 | |
355 | get_fs_names(fs_names); | |
356 | retry: | |
357 | for (p = fs_names; *p; p += strlen(p)+1) { | |
358 | int err = do_mount_root(name, p, flags, root_mount_data); | |
359 | switch (err) { | |
360 | case 0: | |
361 | goto out; | |
362 | case -EACCES: | |
363 | flags |= MS_RDONLY; | |
364 | goto retry; | |
365 | case -EINVAL: | |
366 | continue; | |
367 | } | |
368 | /* | |
369 | * Allow the user to distinguish between failed sys_open | |
370 | * and bad superblock on root device. | |
dd2a345f | 371 | * and give them a list of the available devices |
1da177e4 | 372 | */ |
9361401e | 373 | #ifdef CONFIG_BLOCK |
1da177e4 | 374 | __bdevname(ROOT_DEV, b); |
9361401e | 375 | #endif |
0e0cb892 BW |
376 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
377 | root_device_name, b, err); | |
dd2a345f | 378 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 379 | |
dd2a345f | 380 | printk_all_partitions(); |
55dc7db7 TH |
381 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
382 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
383 | "explicit textual name for \"root=\" boot option.\n"); | |
384 | #endif | |
1da177e4 LT |
385 | panic("VFS: Unable to mount root fs on %s", b); |
386 | } | |
be6e028b | 387 | |
dd2a345f DG |
388 | printk("List of all partitions:\n"); |
389 | printk_all_partitions(); | |
be6e028b AW |
390 | printk("No filesystem could mount root, tried: "); |
391 | for (p = fs_names; *p; p += strlen(p)+1) | |
392 | printk(" %s", p); | |
393 | printk("\n"); | |
9361401e DH |
394 | #ifdef CONFIG_BLOCK |
395 | __bdevname(ROOT_DEV, b); | |
396 | #endif | |
397 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 LT |
398 | out: |
399 | putname(fs_names); | |
400 | } | |
401 | ||
402 | #ifdef CONFIG_ROOT_NFS | |
43717c7d CL |
403 | |
404 | #define NFSROOT_TIMEOUT_MIN 5 | |
405 | #define NFSROOT_TIMEOUT_MAX 30 | |
406 | #define NFSROOT_RETRY_MAX 5 | |
407 | ||
1da177e4 LT |
408 | static int __init mount_nfs_root(void) |
409 | { | |
56463e50 | 410 | char *root_dev, *root_data; |
43717c7d CL |
411 | unsigned int timeout; |
412 | int try, err; | |
1da177e4 | 413 | |
43717c7d CL |
414 | err = nfs_root_data(&root_dev, &root_data); |
415 | if (err != 0) | |
56463e50 | 416 | return 0; |
43717c7d CL |
417 | |
418 | /* | |
419 | * The server or network may not be ready, so try several | |
420 | * times. Stop after a few tries in case the client wants | |
421 | * to fall back to other boot methods. | |
422 | */ | |
423 | timeout = NFSROOT_TIMEOUT_MIN; | |
424 | for (try = 1; ; try++) { | |
425 | err = do_mount_root(root_dev, "nfs", | |
426 | root_mountflags, root_data); | |
427 | if (err == 0) | |
428 | return 1; | |
429 | if (try > NFSROOT_RETRY_MAX) | |
430 | break; | |
431 | ||
432 | /* Wait, in case the server refused us immediately */ | |
433 | ssleep(timeout); | |
434 | timeout <<= 1; | |
435 | if (timeout > NFSROOT_TIMEOUT_MAX) | |
436 | timeout = NFSROOT_TIMEOUT_MAX; | |
437 | } | |
438 | return 0; | |
1da177e4 LT |
439 | } |
440 | #endif | |
441 | ||
442 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
443 | void __init change_floppy(char *fmt, ...) | |
444 | { | |
445 | struct termios termios; | |
446 | char buf[80]; | |
447 | char c; | |
448 | int fd; | |
449 | va_list args; | |
450 | va_start(args, fmt); | |
451 | vsprintf(buf, fmt, args); | |
452 | va_end(args); | |
453 | fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); | |
454 | if (fd >= 0) { | |
455 | sys_ioctl(fd, FDEJECT, 0); | |
456 | sys_close(fd); | |
457 | } | |
458 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
459 | fd = sys_open("/dev/console", O_RDWR, 0); | |
460 | if (fd >= 0) { | |
461 | sys_ioctl(fd, TCGETS, (long)&termios); | |
462 | termios.c_lflag &= ~ICANON; | |
463 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
464 | sys_read(fd, &c, 1); | |
465 | termios.c_lflag |= ICANON; | |
466 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
467 | sys_close(fd); | |
468 | } | |
469 | } | |
470 | #endif | |
471 | ||
472 | void __init mount_root(void) | |
473 | { | |
474 | #ifdef CONFIG_ROOT_NFS | |
475 | if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { | |
476 | if (mount_nfs_root()) | |
477 | return; | |
478 | ||
479 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
480 | ROOT_DEV = Root_FD0; | |
481 | } | |
482 | #endif | |
483 | #ifdef CONFIG_BLK_DEV_FD | |
484 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
485 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
486 | if (rd_doload==2) { | |
487 | if (rd_load_disk(1)) { | |
488 | ROOT_DEV = Root_RAM1; | |
489 | root_device_name = NULL; | |
490 | } | |
491 | } else | |
492 | change_floppy("root floppy"); | |
493 | } | |
494 | #endif | |
9361401e | 495 | #ifdef CONFIG_BLOCK |
bdaf8529 | 496 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 | 497 | mount_block_root("/dev/root", root_mountflags); |
9361401e | 498 | #endif |
1da177e4 LT |
499 | } |
500 | ||
501 | /* | |
502 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
503 | */ | |
504 | void __init prepare_namespace(void) | |
505 | { | |
506 | int is_floppy; | |
507 | ||
1da177e4 LT |
508 | if (root_delay) { |
509 | printk(KERN_INFO "Waiting %dsec before mounting root device...\n", | |
510 | root_delay); | |
511 | ssleep(root_delay); | |
512 | } | |
513 | ||
216773a7 AV |
514 | /* |
515 | * wait for the known devices to complete their probing | |
516 | * | |
517 | * Note: this is a potential source of long boot delays. | |
518 | * For example, it is not atypical to wait 5 seconds here | |
519 | * for the touchpad of a laptop to initialize. | |
520 | */ | |
521 | wait_for_device_probe(); | |
d779249e | 522 | |
1da177e4 LT |
523 | md_run_setup(); |
524 | ||
525 | if (saved_root_name[0]) { | |
526 | root_device_name = saved_root_name; | |
2d62f488 AH |
527 | if (!strncmp(root_device_name, "mtd", 3) || |
528 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
529 | mount_block_root(root_device_name, root_mountflags); |
530 | goto out; | |
531 | } | |
1da177e4 LT |
532 | ROOT_DEV = name_to_dev_t(root_device_name); |
533 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
534 | root_device_name += 5; | |
535 | } | |
536 | ||
1da177e4 LT |
537 | if (initrd_load()) |
538 | goto out; | |
539 | ||
cc1ed754 PO |
540 | /* wait for any asynchronous scanning to complete */ |
541 | if ((ROOT_DEV == 0) && root_wait) { | |
542 | printk(KERN_INFO "Waiting for root device %s...\n", | |
543 | saved_root_name); | |
544 | while (driver_probe_done() != 0 || | |
545 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
546 | msleep(100); | |
216773a7 | 547 | async_synchronize_full(); |
cc1ed754 PO |
548 | } |
549 | ||
550 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
551 | ||
1da177e4 LT |
552 | if (is_floppy && rd_doload && rd_load_disk(0)) |
553 | ROOT_DEV = Root_RAM0; | |
554 | ||
555 | mount_root(); | |
556 | out: | |
2b2af54a | 557 | devtmpfs_mount("dev"); |
1da177e4 | 558 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
562f5e63 | 559 | sys_chroot((const char __user __force *)"."); |
1da177e4 | 560 | } |