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Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/init.h> |
2 | #include <linux/fs.h> | |
3 | #include <linux/slab.h> | |
4 | #include <linux/types.h> | |
5 | #include <linux/fcntl.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/string.h> | |
8 | #include <linux/syscalls.h> | |
889d51a1 | 9 | #include <linux/utime.h> |
1da177e4 LT |
10 | |
11 | static __initdata char *message; | |
12 | static void __init error(char *x) | |
13 | { | |
14 | if (!message) | |
15 | message = x; | |
16 | } | |
17 | ||
1da177e4 LT |
18 | /* link hash */ |
19 | ||
6a050da4 MH |
20 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
21 | ||
1da177e4 LT |
22 | static __initdata struct hash { |
23 | int ino, minor, major; | |
2139a7fb | 24 | mode_t mode; |
1da177e4 | 25 | struct hash *next; |
6a050da4 | 26 | char name[N_ALIGN(PATH_MAX)]; |
1da177e4 LT |
27 | } *head[32]; |
28 | ||
29 | static inline int hash(int major, int minor, int ino) | |
30 | { | |
31 | unsigned long tmp = ino + minor + (major << 3); | |
32 | tmp += tmp >> 5; | |
33 | return tmp & 31; | |
34 | } | |
35 | ||
2139a7fb PA |
36 | static char __init *find_link(int major, int minor, int ino, |
37 | mode_t mode, char *name) | |
1da177e4 LT |
38 | { |
39 | struct hash **p, *q; | |
40 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
41 | if ((*p)->ino != ino) | |
42 | continue; | |
43 | if ((*p)->minor != minor) | |
44 | continue; | |
45 | if ((*p)->major != major) | |
46 | continue; | |
2139a7fb PA |
47 | if (((*p)->mode ^ mode) & S_IFMT) |
48 | continue; | |
1da177e4 LT |
49 | return (*p)->name; |
50 | } | |
3265e66b | 51 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
1da177e4 LT |
52 | if (!q) |
53 | panic("can't allocate link hash entry"); | |
1da177e4 | 54 | q->major = major; |
2139a7fb PA |
55 | q->minor = minor; |
56 | q->ino = ino; | |
57 | q->mode = mode; | |
6a050da4 | 58 | strcpy(q->name, name); |
1da177e4 LT |
59 | q->next = NULL; |
60 | *p = q; | |
61 | return NULL; | |
62 | } | |
63 | ||
64 | static void __init free_hash(void) | |
65 | { | |
66 | struct hash **p, *q; | |
67 | for (p = head; p < head + 32; p++) { | |
68 | while (*p) { | |
69 | q = *p; | |
70 | *p = q->next; | |
3265e66b | 71 | kfree(q); |
1da177e4 LT |
72 | } |
73 | } | |
74 | } | |
75 | ||
889d51a1 NL |
76 | static long __init do_utime(char __user *filename, time_t mtime) |
77 | { | |
78 | struct timespec t[2]; | |
79 | ||
80 | t[0].tv_sec = mtime; | |
81 | t[0].tv_nsec = 0; | |
82 | t[1].tv_sec = mtime; | |
83 | t[1].tv_nsec = 0; | |
84 | ||
85 | return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); | |
86 | } | |
87 | ||
88 | static __initdata LIST_HEAD(dir_list); | |
89 | struct dir_entry { | |
90 | struct list_head list; | |
91 | char *name; | |
92 | time_t mtime; | |
93 | }; | |
94 | ||
95 | static void __init dir_add(const char *name, time_t mtime) | |
96 | { | |
97 | struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); | |
98 | if (!de) | |
99 | panic("can't allocate dir_entry buffer"); | |
100 | INIT_LIST_HEAD(&de->list); | |
101 | de->name = kstrdup(name, GFP_KERNEL); | |
102 | de->mtime = mtime; | |
103 | list_add(&de->list, &dir_list); | |
104 | } | |
105 | ||
106 | static void __init dir_utime(void) | |
107 | { | |
108 | struct dir_entry *de, *tmp; | |
109 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
110 | list_del(&de->list); | |
111 | do_utime(de->name, de->mtime); | |
112 | kfree(de->name); | |
113 | kfree(de); | |
114 | } | |
115 | } | |
116 | ||
117 | static __initdata time_t mtime; | |
118 | ||
1da177e4 LT |
119 | /* cpio header parsing */ |
120 | ||
121 | static __initdata unsigned long ino, major, minor, nlink; | |
122 | static __initdata mode_t mode; | |
123 | static __initdata unsigned long body_len, name_len; | |
124 | static __initdata uid_t uid; | |
125 | static __initdata gid_t gid; | |
126 | static __initdata unsigned rdev; | |
127 | ||
128 | static void __init parse_header(char *s) | |
129 | { | |
130 | unsigned long parsed[12]; | |
131 | char buf[9]; | |
132 | int i; | |
133 | ||
134 | buf[8] = '\0'; | |
135 | for (i = 0, s += 6; i < 12; i++, s += 8) { | |
136 | memcpy(buf, s, 8); | |
137 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
138 | } | |
139 | ino = parsed[0]; | |
140 | mode = parsed[1]; | |
141 | uid = parsed[2]; | |
142 | gid = parsed[3]; | |
143 | nlink = parsed[4]; | |
889d51a1 | 144 | mtime = parsed[5]; |
1da177e4 LT |
145 | body_len = parsed[6]; |
146 | major = parsed[7]; | |
147 | minor = parsed[8]; | |
148 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
149 | name_len = parsed[11]; | |
150 | } | |
151 | ||
152 | /* FSM */ | |
153 | ||
154 | static __initdata enum state { | |
155 | Start, | |
156 | Collect, | |
157 | GotHeader, | |
158 | SkipIt, | |
159 | GotName, | |
160 | CopyFile, | |
161 | GotSymlink, | |
162 | Reset | |
163 | } state, next_state; | |
164 | ||
165 | static __initdata char *victim; | |
166 | static __initdata unsigned count; | |
167 | static __initdata loff_t this_header, next_header; | |
168 | ||
169 | static __initdata int dry_run; | |
170 | ||
b0a5ab93 | 171 | static inline void __init eat(unsigned n) |
1da177e4 LT |
172 | { |
173 | victim += n; | |
174 | this_header += n; | |
175 | count -= n; | |
176 | } | |
177 | ||
889d51a1 | 178 | static __initdata char *vcollected; |
1da177e4 LT |
179 | static __initdata char *collected; |
180 | static __initdata int remains; | |
181 | static __initdata char *collect; | |
182 | ||
183 | static void __init read_into(char *buf, unsigned size, enum state next) | |
184 | { | |
185 | if (count >= size) { | |
186 | collected = victim; | |
187 | eat(size); | |
188 | state = next; | |
189 | } else { | |
190 | collect = collected = buf; | |
191 | remains = size; | |
192 | next_state = next; | |
193 | state = Collect; | |
194 | } | |
195 | } | |
196 | ||
197 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
198 | ||
199 | static int __init do_start(void) | |
200 | { | |
201 | read_into(header_buf, 110, GotHeader); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int __init do_collect(void) | |
206 | { | |
207 | unsigned n = remains; | |
208 | if (count < n) | |
209 | n = count; | |
210 | memcpy(collect, victim, n); | |
211 | eat(n); | |
212 | collect += n; | |
213 | if ((remains -= n) != 0) | |
214 | return 1; | |
215 | state = next_state; | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int __init do_header(void) | |
220 | { | |
2e591bbc AV |
221 | if (memcmp(collected, "070707", 6)==0) { |
222 | error("incorrect cpio method used: use -H newc option"); | |
223 | return 1; | |
224 | } | |
1da177e4 LT |
225 | if (memcmp(collected, "070701", 6)) { |
226 | error("no cpio magic"); | |
227 | return 1; | |
228 | } | |
229 | parse_header(collected); | |
230 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
231 | next_header = (next_header + 3) & ~3; | |
232 | if (dry_run) { | |
233 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
234 | return 0; | |
235 | } | |
236 | state = SkipIt; | |
237 | if (name_len <= 0 || name_len > PATH_MAX) | |
238 | return 0; | |
239 | if (S_ISLNK(mode)) { | |
240 | if (body_len > PATH_MAX) | |
241 | return 0; | |
242 | collect = collected = symlink_buf; | |
243 | remains = N_ALIGN(name_len) + body_len; | |
244 | next_state = GotSymlink; | |
245 | state = Collect; | |
246 | return 0; | |
247 | } | |
248 | if (S_ISREG(mode) || !body_len) | |
249 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int __init do_skip(void) | |
254 | { | |
255 | if (this_header + count < next_header) { | |
256 | eat(count); | |
257 | return 1; | |
258 | } else { | |
259 | eat(next_header - this_header); | |
260 | state = next_state; | |
261 | return 0; | |
262 | } | |
263 | } | |
264 | ||
265 | static int __init do_reset(void) | |
266 | { | |
267 | while(count && *victim == '\0') | |
268 | eat(1); | |
269 | if (count && (this_header & 3)) | |
270 | error("broken padding"); | |
271 | return 1; | |
272 | } | |
273 | ||
274 | static int __init maybe_link(void) | |
275 | { | |
276 | if (nlink >= 2) { | |
2139a7fb | 277 | char *old = find_link(major, minor, ino, mode, collected); |
1da177e4 LT |
278 | if (old) |
279 | return (sys_link(old, collected) < 0) ? -1 : 1; | |
280 | } | |
281 | return 0; | |
282 | } | |
283 | ||
2139a7fb PA |
284 | static void __init clean_path(char *path, mode_t mode) |
285 | { | |
286 | struct stat st; | |
287 | ||
288 | if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) { | |
289 | if (S_ISDIR(st.st_mode)) | |
290 | sys_rmdir(path); | |
291 | else | |
292 | sys_unlink(path); | |
293 | } | |
294 | } | |
295 | ||
1da177e4 LT |
296 | static __initdata int wfd; |
297 | ||
298 | static int __init do_name(void) | |
299 | { | |
300 | state = SkipIt; | |
301 | next_state = Reset; | |
302 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
303 | free_hash(); | |
304 | return 0; | |
305 | } | |
306 | if (dry_run) | |
307 | return 0; | |
2139a7fb | 308 | clean_path(collected, mode); |
1da177e4 | 309 | if (S_ISREG(mode)) { |
2139a7fb PA |
310 | int ml = maybe_link(); |
311 | if (ml >= 0) { | |
312 | int openflags = O_WRONLY|O_CREAT; | |
313 | if (ml != 1) | |
314 | openflags |= O_TRUNC; | |
315 | wfd = sys_open(collected, openflags, mode); | |
316 | ||
1da177e4 LT |
317 | if (wfd >= 0) { |
318 | sys_fchown(wfd, uid, gid); | |
319 | sys_fchmod(wfd, mode); | |
cb6ff208 | 320 | sys_ftruncate(wfd, body_len); |
889d51a1 | 321 | vcollected = kstrdup(collected, GFP_KERNEL); |
1da177e4 LT |
322 | state = CopyFile; |
323 | } | |
324 | } | |
325 | } else if (S_ISDIR(mode)) { | |
326 | sys_mkdir(collected, mode); | |
327 | sys_chown(collected, uid, gid); | |
328 | sys_chmod(collected, mode); | |
889d51a1 | 329 | dir_add(collected, mtime); |
1da177e4 LT |
330 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
331 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
332 | if (maybe_link() == 0) { | |
333 | sys_mknod(collected, mode, rdev); | |
334 | sys_chown(collected, uid, gid); | |
335 | sys_chmod(collected, mode); | |
889d51a1 | 336 | do_utime(collected, mtime); |
1da177e4 LT |
337 | } |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static int __init do_copy(void) | |
343 | { | |
344 | if (count >= body_len) { | |
345 | sys_write(wfd, victim, body_len); | |
346 | sys_close(wfd); | |
889d51a1 NL |
347 | do_utime(vcollected, mtime); |
348 | kfree(vcollected); | |
1da177e4 LT |
349 | eat(body_len); |
350 | state = SkipIt; | |
351 | return 0; | |
352 | } else { | |
353 | sys_write(wfd, victim, count); | |
354 | body_len -= count; | |
355 | eat(count); | |
356 | return 1; | |
357 | } | |
358 | } | |
359 | ||
360 | static int __init do_symlink(void) | |
361 | { | |
362 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
2139a7fb | 363 | clean_path(collected, 0); |
1da177e4 LT |
364 | sys_symlink(collected + N_ALIGN(name_len), collected); |
365 | sys_lchown(collected, uid, gid); | |
889d51a1 | 366 | do_utime(collected, mtime); |
1da177e4 LT |
367 | state = SkipIt; |
368 | next_state = Reset; | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static __initdata int (*actions[])(void) = { | |
373 | [Start] = do_start, | |
374 | [Collect] = do_collect, | |
375 | [GotHeader] = do_header, | |
376 | [SkipIt] = do_skip, | |
377 | [GotName] = do_name, | |
378 | [CopyFile] = do_copy, | |
379 | [GotSymlink] = do_symlink, | |
380 | [Reset] = do_reset, | |
381 | }; | |
382 | ||
383 | static int __init write_buffer(char *buf, unsigned len) | |
384 | { | |
385 | count = len; | |
386 | victim = buf; | |
387 | ||
388 | while (!actions[state]()) | |
389 | ; | |
390 | return len - count; | |
391 | } | |
392 | ||
30d65dbf | 393 | static int __init flush_buffer(void *bufv, unsigned len) |
1da177e4 | 394 | { |
30d65dbf | 395 | char *buf = (char *) bufv; |
1da177e4 | 396 | int written; |
30d65dbf | 397 | int origLen = len; |
1da177e4 | 398 | if (message) |
30d65dbf | 399 | return -1; |
1da177e4 LT |
400 | while ((written = write_buffer(buf, len)) < len && !message) { |
401 | char c = buf[written]; | |
402 | if (c == '0') { | |
403 | buf += written; | |
404 | len -= written; | |
405 | state = Start; | |
406 | } else if (c == 0) { | |
407 | buf += written; | |
408 | len -= written; | |
409 | state = Reset; | |
410 | } else | |
411 | error("junk in compressed archive"); | |
412 | } | |
30d65dbf | 413 | return origLen; |
1da177e4 LT |
414 | } |
415 | ||
30d65dbf | 416 | static unsigned my_inptr; /* index of next byte to be processed in inbuf */ |
1da177e4 | 417 | |
889c92d2 | 418 | #include <linux/decompress/generic.h> |
1da177e4 LT |
419 | |
420 | static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) | |
421 | { | |
422 | int written; | |
889c92d2 PA |
423 | decompress_fn decompress; |
424 | ||
1da177e4 | 425 | dry_run = check_only; |
3265e66b TP |
426 | header_buf = kmalloc(110, GFP_KERNEL); |
427 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
428 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
30d65dbf AK |
429 | |
430 | if (!header_buf || !symlink_buf || !name_buf) | |
1da177e4 | 431 | panic("can't allocate buffers"); |
30d65dbf | 432 | |
1da177e4 LT |
433 | state = Start; |
434 | this_header = 0; | |
435 | message = NULL; | |
436 | while (!message && len) { | |
437 | loff_t saved_offset = this_header; | |
438 | if (*buf == '0' && !(this_header & 3)) { | |
439 | state = Start; | |
440 | written = write_buffer(buf, len); | |
441 | buf += written; | |
442 | len -= written; | |
443 | continue; | |
444 | } | |
445 | if (!*buf) { | |
446 | buf++; | |
447 | len--; | |
448 | this_header++; | |
449 | continue; | |
450 | } | |
451 | this_header = 0; | |
889c92d2 PA |
452 | decompress = decompress_method(buf, len, NULL); |
453 | if (decompress) | |
454 | decompress(buf, len, NULL, flush_buffer, NULL, | |
455 | &my_inptr, error); | |
1da177e4 | 456 | if (state != Reset) |
30d65dbf AK |
457 | error("junk in compressed archive"); |
458 | this_header = saved_offset + my_inptr; | |
459 | buf += my_inptr; | |
460 | len -= my_inptr; | |
1da177e4 | 461 | } |
889d51a1 | 462 | dir_utime(); |
3265e66b TP |
463 | kfree(name_buf); |
464 | kfree(symlink_buf); | |
465 | kfree(header_buf); | |
1da177e4 LT |
466 | return message; |
467 | } | |
468 | ||
0a7b35cb MN |
469 | static int __initdata do_retain_initrd; |
470 | ||
471 | static int __init retain_initrd_param(char *str) | |
472 | { | |
473 | if (*str) | |
474 | return 0; | |
475 | do_retain_initrd = 1; | |
476 | return 1; | |
477 | } | |
478 | __setup("retain_initrd", retain_initrd_param); | |
479 | ||
1da177e4 | 480 | extern char __initramfs_start[], __initramfs_end[]; |
1da177e4 | 481 | #include <linux/initrd.h> |
9c15e852 | 482 | #include <linux/kexec.h> |
0f3d2bd5 JB |
483 | |
484 | static void __init free_initrd(void) | |
485 | { | |
9c15e852 HM |
486 | #ifdef CONFIG_KEXEC |
487 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); | |
488 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
0a7b35cb MN |
489 | #endif |
490 | if (do_retain_initrd) | |
491 | goto skip; | |
9c15e852 | 492 | |
0a7b35cb | 493 | #ifdef CONFIG_KEXEC |
9c15e852 HM |
494 | /* |
495 | * If the initrd region is overlapped with crashkernel reserved region, | |
496 | * free only memory that is not part of crashkernel region. | |
497 | */ | |
498 | if (initrd_start < crashk_end && initrd_end > crashk_start) { | |
499 | /* | |
500 | * Initialize initrd memory region since the kexec boot does | |
501 | * not do. | |
502 | */ | |
503 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
504 | if (initrd_start < crashk_start) | |
505 | free_initrd_mem(initrd_start, crashk_start); | |
506 | if (initrd_end > crashk_end) | |
507 | free_initrd_mem(crashk_end, initrd_end); | |
508 | } else | |
509 | #endif | |
510 | free_initrd_mem(initrd_start, initrd_end); | |
0a7b35cb | 511 | skip: |
0f3d2bd5 JB |
512 | initrd_start = 0; |
513 | initrd_end = 0; | |
514 | } | |
515 | ||
9a9e0d68 | 516 | static int __init populate_rootfs(void) |
1da177e4 LT |
517 | { |
518 | char *err = unpack_to_rootfs(__initramfs_start, | |
519 | __initramfs_end - __initramfs_start, 0); | |
520 | if (err) | |
521 | panic(err); | |
1da177e4 | 522 | if (initrd_start) { |
340e48e6 | 523 | #ifdef CONFIG_BLK_DEV_RAM |
1da177e4 LT |
524 | int fd; |
525 | printk(KERN_INFO "checking if image is initramfs..."); | |
526 | err = unpack_to_rootfs((char *)initrd_start, | |
527 | initrd_end - initrd_start, 1); | |
528 | if (!err) { | |
529 | printk(" it is\n"); | |
530 | unpack_to_rootfs((char *)initrd_start, | |
531 | initrd_end - initrd_start, 0); | |
0f3d2bd5 | 532 | free_initrd(); |
8d610dd5 | 533 | return 0; |
1da177e4 LT |
534 | } |
535 | printk("it isn't (%s); looks like an initrd\n", err); | |
33644c5e | 536 | fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700); |
1da177e4 LT |
537 | if (fd >= 0) { |
538 | sys_write(fd, (char *)initrd_start, | |
539 | initrd_end - initrd_start); | |
540 | sys_close(fd); | |
0f3d2bd5 | 541 | free_initrd(); |
1da177e4 | 542 | } |
340e48e6 ZP |
543 | #else |
544 | printk(KERN_INFO "Unpacking initramfs..."); | |
545 | err = unpack_to_rootfs((char *)initrd_start, | |
546 | initrd_end - initrd_start, 0); | |
547 | if (err) | |
548 | panic(err); | |
549 | printk(" done\n"); | |
550 | free_initrd(); | |
551 | #endif | |
1da177e4 | 552 | } |
8d610dd5 | 553 | return 0; |
1da177e4 | 554 | } |
8d610dd5 | 555 | rootfs_initcall(populate_rootfs); |