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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | #include <linux/init.h> |
3 | #include <linux/fs.h> | |
4 | #include <linux/slab.h> | |
5 | #include <linux/types.h> | |
6 | #include <linux/fcntl.h> | |
7 | #include <linux/delay.h> | |
8 | #include <linux/string.h> | |
df52092f | 9 | #include <linux/dirent.h> |
1da177e4 | 10 | #include <linux/syscalls.h> |
889d51a1 | 11 | #include <linux/utime.h> |
08865514 | 12 | #include <linux/file.h> |
899ee4af | 13 | #include <linux/memblock.h> |
1da177e4 | 14 | |
38747439 YL |
15 | static ssize_t __init xwrite(int fd, const char *p, size_t count) |
16 | { | |
17 | ssize_t out = 0; | |
18 | ||
19 | /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ | |
20 | while (count) { | |
e7a3e8b2 | 21 | ssize_t rv = ksys_write(fd, p, count); |
38747439 YL |
22 | |
23 | if (rv < 0) { | |
24 | if (rv == -EINTR || rv == -EAGAIN) | |
25 | continue; | |
26 | return out ? out : rv; | |
27 | } else if (rv == 0) | |
28 | break; | |
29 | ||
30 | p += rv; | |
31 | out += rv; | |
32 | count -= rv; | |
33 | } | |
34 | ||
35 | return out; | |
36 | } | |
37 | ||
1da177e4 LT |
38 | static __initdata char *message; |
39 | static void __init error(char *x) | |
40 | { | |
41 | if (!message) | |
42 | message = x; | |
43 | } | |
44 | ||
1da177e4 LT |
45 | /* link hash */ |
46 | ||
6a050da4 MH |
47 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
48 | ||
1da177e4 LT |
49 | static __initdata struct hash { |
50 | int ino, minor, major; | |
685dd2d5 | 51 | umode_t mode; |
1da177e4 | 52 | struct hash *next; |
6a050da4 | 53 | char name[N_ALIGN(PATH_MAX)]; |
1da177e4 LT |
54 | } *head[32]; |
55 | ||
56 | static inline int hash(int major, int minor, int ino) | |
57 | { | |
58 | unsigned long tmp = ino + minor + (major << 3); | |
59 | tmp += tmp >> 5; | |
60 | return tmp & 31; | |
61 | } | |
62 | ||
2139a7fb | 63 | static char __init *find_link(int major, int minor, int ino, |
685dd2d5 | 64 | umode_t mode, char *name) |
1da177e4 LT |
65 | { |
66 | struct hash **p, *q; | |
67 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
68 | if ((*p)->ino != ino) | |
69 | continue; | |
70 | if ((*p)->minor != minor) | |
71 | continue; | |
72 | if ((*p)->major != major) | |
73 | continue; | |
2139a7fb PA |
74 | if (((*p)->mode ^ mode) & S_IFMT) |
75 | continue; | |
1da177e4 LT |
76 | return (*p)->name; |
77 | } | |
3265e66b | 78 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
1da177e4 LT |
79 | if (!q) |
80 | panic("can't allocate link hash entry"); | |
1da177e4 | 81 | q->major = major; |
2139a7fb PA |
82 | q->minor = minor; |
83 | q->ino = ino; | |
84 | q->mode = mode; | |
6a050da4 | 85 | strcpy(q->name, name); |
1da177e4 LT |
86 | q->next = NULL; |
87 | *p = q; | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | static void __init free_hash(void) | |
92 | { | |
93 | struct hash **p, *q; | |
94 | for (p = head; p < head + 32; p++) { | |
95 | while (*p) { | |
96 | q = *p; | |
97 | *p = q->next; | |
3265e66b | 98 | kfree(q); |
1da177e4 LT |
99 | } |
100 | } | |
101 | } | |
102 | ||
e35c4c64 | 103 | static long __init do_utime(char *filename, time64_t mtime) |
889d51a1 | 104 | { |
aaed2dd8 | 105 | struct timespec64 t[2]; |
889d51a1 NL |
106 | |
107 | t[0].tv_sec = mtime; | |
108 | t[0].tv_nsec = 0; | |
109 | t[1].tv_sec = mtime; | |
110 | t[1].tv_nsec = 0; | |
111 | ||
112 | return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); | |
113 | } | |
114 | ||
115 | static __initdata LIST_HEAD(dir_list); | |
116 | struct dir_entry { | |
117 | struct list_head list; | |
118 | char *name; | |
e35c4c64 | 119 | time64_t mtime; |
889d51a1 NL |
120 | }; |
121 | ||
e35c4c64 | 122 | static void __init dir_add(const char *name, time64_t mtime) |
889d51a1 NL |
123 | { |
124 | struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); | |
125 | if (!de) | |
126 | panic("can't allocate dir_entry buffer"); | |
127 | INIT_LIST_HEAD(&de->list); | |
128 | de->name = kstrdup(name, GFP_KERNEL); | |
129 | de->mtime = mtime; | |
130 | list_add(&de->list, &dir_list); | |
131 | } | |
132 | ||
133 | static void __init dir_utime(void) | |
134 | { | |
135 | struct dir_entry *de, *tmp; | |
136 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
137 | list_del(&de->list); | |
138 | do_utime(de->name, de->mtime); | |
139 | kfree(de->name); | |
140 | kfree(de); | |
141 | } | |
142 | } | |
143 | ||
e35c4c64 | 144 | static __initdata time64_t mtime; |
889d51a1 | 145 | |
1da177e4 LT |
146 | /* cpio header parsing */ |
147 | ||
148 | static __initdata unsigned long ino, major, minor, nlink; | |
685dd2d5 | 149 | static __initdata umode_t mode; |
1da177e4 LT |
150 | static __initdata unsigned long body_len, name_len; |
151 | static __initdata uid_t uid; | |
152 | static __initdata gid_t gid; | |
153 | static __initdata unsigned rdev; | |
154 | ||
155 | static void __init parse_header(char *s) | |
156 | { | |
157 | unsigned long parsed[12]; | |
158 | char buf[9]; | |
159 | int i; | |
160 | ||
161 | buf[8] = '\0'; | |
162 | for (i = 0, s += 6; i < 12; i++, s += 8) { | |
163 | memcpy(buf, s, 8); | |
164 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
165 | } | |
166 | ino = parsed[0]; | |
167 | mode = parsed[1]; | |
168 | uid = parsed[2]; | |
169 | gid = parsed[3]; | |
170 | nlink = parsed[4]; | |
e35c4c64 | 171 | mtime = parsed[5]; /* breaks in y2106 */ |
1da177e4 LT |
172 | body_len = parsed[6]; |
173 | major = parsed[7]; | |
174 | minor = parsed[8]; | |
175 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
176 | name_len = parsed[11]; | |
177 | } | |
178 | ||
179 | /* FSM */ | |
180 | ||
181 | static __initdata enum state { | |
182 | Start, | |
183 | Collect, | |
184 | GotHeader, | |
185 | SkipIt, | |
186 | GotName, | |
187 | CopyFile, | |
188 | GotSymlink, | |
189 | Reset | |
190 | } state, next_state; | |
191 | ||
192 | static __initdata char *victim; | |
c34d85ac | 193 | static unsigned long byte_count __initdata; |
1da177e4 LT |
194 | static __initdata loff_t this_header, next_header; |
195 | ||
b0a5ab93 | 196 | static inline void __init eat(unsigned n) |
1da177e4 LT |
197 | { |
198 | victim += n; | |
199 | this_header += n; | |
c34d85ac | 200 | byte_count -= n; |
1da177e4 LT |
201 | } |
202 | ||
889d51a1 | 203 | static __initdata char *vcollected; |
1da177e4 | 204 | static __initdata char *collected; |
d97b07c5 | 205 | static long remains __initdata; |
1da177e4 LT |
206 | static __initdata char *collect; |
207 | ||
208 | static void __init read_into(char *buf, unsigned size, enum state next) | |
209 | { | |
c34d85ac | 210 | if (byte_count >= size) { |
1da177e4 LT |
211 | collected = victim; |
212 | eat(size); | |
213 | state = next; | |
214 | } else { | |
215 | collect = collected = buf; | |
216 | remains = size; | |
217 | next_state = next; | |
218 | state = Collect; | |
219 | } | |
220 | } | |
221 | ||
222 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
223 | ||
224 | static int __init do_start(void) | |
225 | { | |
226 | read_into(header_buf, 110, GotHeader); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int __init do_collect(void) | |
231 | { | |
d97b07c5 | 232 | unsigned long n = remains; |
c34d85ac MR |
233 | if (byte_count < n) |
234 | n = byte_count; | |
1da177e4 LT |
235 | memcpy(collect, victim, n); |
236 | eat(n); | |
237 | collect += n; | |
238 | if ((remains -= n) != 0) | |
239 | return 1; | |
240 | state = next_state; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int __init do_header(void) | |
245 | { | |
2e591bbc AV |
246 | if (memcmp(collected, "070707", 6)==0) { |
247 | error("incorrect cpio method used: use -H newc option"); | |
248 | return 1; | |
249 | } | |
1da177e4 LT |
250 | if (memcmp(collected, "070701", 6)) { |
251 | error("no cpio magic"); | |
252 | return 1; | |
253 | } | |
254 | parse_header(collected); | |
255 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
256 | next_header = (next_header + 3) & ~3; | |
1da177e4 LT |
257 | state = SkipIt; |
258 | if (name_len <= 0 || name_len > PATH_MAX) | |
259 | return 0; | |
260 | if (S_ISLNK(mode)) { | |
261 | if (body_len > PATH_MAX) | |
262 | return 0; | |
263 | collect = collected = symlink_buf; | |
264 | remains = N_ALIGN(name_len) + body_len; | |
265 | next_state = GotSymlink; | |
266 | state = Collect; | |
267 | return 0; | |
268 | } | |
269 | if (S_ISREG(mode) || !body_len) | |
270 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static int __init do_skip(void) | |
275 | { | |
c34d85ac MR |
276 | if (this_header + byte_count < next_header) { |
277 | eat(byte_count); | |
1da177e4 LT |
278 | return 1; |
279 | } else { | |
280 | eat(next_header - this_header); | |
281 | state = next_state; | |
282 | return 0; | |
283 | } | |
284 | } | |
285 | ||
286 | static int __init do_reset(void) | |
287 | { | |
c34d85ac | 288 | while (byte_count && *victim == '\0') |
1da177e4 | 289 | eat(1); |
c34d85ac | 290 | if (byte_count && (this_header & 3)) |
1da177e4 LT |
291 | error("broken padding"); |
292 | return 1; | |
293 | } | |
294 | ||
c34d85ac | 295 | static void __init clean_path(char *path, umode_t fmode) |
2139a7fb | 296 | { |
046aa126 | 297 | struct kstat st; |
2139a7fb | 298 | |
046aa126 AB |
299 | if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) { |
300 | if (S_ISDIR(st.mode)) | |
f459dffa | 301 | ksys_rmdir(path); |
2139a7fb | 302 | else |
0f32ab8c | 303 | ksys_unlink(path); |
2139a7fb PA |
304 | } |
305 | } | |
306 | ||
7c0950d4 LZ |
307 | static int __init maybe_link(void) |
308 | { | |
309 | if (nlink >= 2) { | |
310 | char *old = find_link(major, minor, ino, mode, collected); | |
311 | if (old) { | |
312 | clean_path(collected, 0); | |
313 | return (ksys_link(old, collected) < 0) ? -1 : 1; | |
314 | } | |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
1da177e4 LT |
319 | static __initdata int wfd; |
320 | ||
321 | static int __init do_name(void) | |
322 | { | |
323 | state = SkipIt; | |
324 | next_state = Reset; | |
325 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
326 | free_hash(); | |
327 | return 0; | |
328 | } | |
2139a7fb | 329 | clean_path(collected, mode); |
1da177e4 | 330 | if (S_ISREG(mode)) { |
2139a7fb PA |
331 | int ml = maybe_link(); |
332 | if (ml >= 0) { | |
333 | int openflags = O_WRONLY|O_CREAT; | |
334 | if (ml != 1) | |
335 | openflags |= O_TRUNC; | |
bae217ea | 336 | wfd = ksys_open(collected, openflags, mode); |
2139a7fb | 337 | |
1da177e4 | 338 | if (wfd >= 0) { |
55731b3c | 339 | ksys_fchown(wfd, uid, gid); |
03450e27 | 340 | ksys_fchmod(wfd, mode); |
d20d5a74 | 341 | if (body_len) |
411d9475 | 342 | ksys_ftruncate(wfd, body_len); |
889d51a1 | 343 | vcollected = kstrdup(collected, GFP_KERNEL); |
1da177e4 LT |
344 | state = CopyFile; |
345 | } | |
346 | } | |
347 | } else if (S_ISDIR(mode)) { | |
0101db7a | 348 | ksys_mkdir(collected, mode); |
55731b3c | 349 | ksys_chown(collected, uid, gid); |
03450e27 | 350 | ksys_chmod(collected, mode); |
889d51a1 | 351 | dir_add(collected, mtime); |
1da177e4 LT |
352 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
353 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
354 | if (maybe_link() == 0) { | |
87c4e192 | 355 | ksys_mknod(collected, mode, rdev); |
55731b3c | 356 | ksys_chown(collected, uid, gid); |
03450e27 | 357 | ksys_chmod(collected, mode); |
889d51a1 | 358 | do_utime(collected, mtime); |
1da177e4 LT |
359 | } |
360 | } | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static int __init do_copy(void) | |
365 | { | |
c34d85ac | 366 | if (byte_count >= body_len) { |
9687fd91 DE |
367 | if (xwrite(wfd, victim, body_len) != body_len) |
368 | error("write error"); | |
2ca2a09d | 369 | ksys_close(wfd); |
889d51a1 NL |
370 | do_utime(vcollected, mtime); |
371 | kfree(vcollected); | |
1da177e4 LT |
372 | eat(body_len); |
373 | state = SkipIt; | |
374 | return 0; | |
375 | } else { | |
c34d85ac | 376 | if (xwrite(wfd, victim, byte_count) != byte_count) |
9687fd91 | 377 | error("write error"); |
c34d85ac MR |
378 | body_len -= byte_count; |
379 | eat(byte_count); | |
1da177e4 LT |
380 | return 1; |
381 | } | |
382 | } | |
383 | ||
384 | static int __init do_symlink(void) | |
385 | { | |
386 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
2139a7fb | 387 | clean_path(collected, 0); |
b724e846 | 388 | ksys_symlink(collected + N_ALIGN(name_len), collected); |
55731b3c | 389 | ksys_lchown(collected, uid, gid); |
889d51a1 | 390 | do_utime(collected, mtime); |
1da177e4 LT |
391 | state = SkipIt; |
392 | next_state = Reset; | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static __initdata int (*actions[])(void) = { | |
397 | [Start] = do_start, | |
398 | [Collect] = do_collect, | |
399 | [GotHeader] = do_header, | |
400 | [SkipIt] = do_skip, | |
401 | [GotName] = do_name, | |
402 | [CopyFile] = do_copy, | |
403 | [GotSymlink] = do_symlink, | |
404 | [Reset] = do_reset, | |
405 | }; | |
406 | ||
d97b07c5 | 407 | static long __init write_buffer(char *buf, unsigned long len) |
1da177e4 | 408 | { |
c34d85ac | 409 | byte_count = len; |
1da177e4 LT |
410 | victim = buf; |
411 | ||
412 | while (!actions[state]()) | |
413 | ; | |
c34d85ac | 414 | return len - byte_count; |
1da177e4 LT |
415 | } |
416 | ||
d97b07c5 | 417 | static long __init flush_buffer(void *bufv, unsigned long len) |
1da177e4 | 418 | { |
30d65dbf | 419 | char *buf = (char *) bufv; |
d97b07c5 YL |
420 | long written; |
421 | long origLen = len; | |
1da177e4 | 422 | if (message) |
30d65dbf | 423 | return -1; |
1da177e4 LT |
424 | while ((written = write_buffer(buf, len)) < len && !message) { |
425 | char c = buf[written]; | |
426 | if (c == '0') { | |
427 | buf += written; | |
428 | len -= written; | |
429 | state = Start; | |
430 | } else if (c == 0) { | |
431 | buf += written; | |
432 | len -= written; | |
433 | state = Reset; | |
434 | } else | |
e5eed351 | 435 | error("junk within compressed archive"); |
1da177e4 | 436 | } |
30d65dbf | 437 | return origLen; |
1da177e4 LT |
438 | } |
439 | ||
d97b07c5 | 440 | static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ |
1da177e4 | 441 | |
889c92d2 | 442 | #include <linux/decompress/generic.h> |
1da177e4 | 443 | |
d97b07c5 | 444 | static char * __init unpack_to_rootfs(char *buf, unsigned long len) |
1da177e4 | 445 | { |
d97b07c5 | 446 | long written; |
889c92d2 | 447 | decompress_fn decompress; |
23a22d57 PA |
448 | const char *compress_name; |
449 | static __initdata char msg_buf[64]; | |
889c92d2 | 450 | |
3265e66b TP |
451 | header_buf = kmalloc(110, GFP_KERNEL); |
452 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
453 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
30d65dbf AK |
454 | |
455 | if (!header_buf || !symlink_buf || !name_buf) | |
1da177e4 | 456 | panic("can't allocate buffers"); |
30d65dbf | 457 | |
1da177e4 LT |
458 | state = Start; |
459 | this_header = 0; | |
460 | message = NULL; | |
461 | while (!message && len) { | |
462 | loff_t saved_offset = this_header; | |
463 | if (*buf == '0' && !(this_header & 3)) { | |
464 | state = Start; | |
465 | written = write_buffer(buf, len); | |
466 | buf += written; | |
467 | len -= written; | |
468 | continue; | |
469 | } | |
470 | if (!*buf) { | |
471 | buf++; | |
472 | len--; | |
473 | this_header++; | |
474 | continue; | |
475 | } | |
476 | this_header = 0; | |
23a22d57 | 477 | decompress = decompress_method(buf, len, &compress_name); |
6aa7a29a | 478 | pr_debug("Detected %s compressed data\n", compress_name); |
54291362 | 479 | if (decompress) { |
d97b07c5 | 480 | int res = decompress(buf, len, NULL, flush_buffer, NULL, |
889c92d2 | 481 | &my_inptr, error); |
54291362 PL |
482 | if (res) |
483 | error("decompressor failed"); | |
484 | } else if (compress_name) { | |
23a22d57 PA |
485 | if (!message) { |
486 | snprintf(msg_buf, sizeof msg_buf, | |
487 | "compression method %s not configured", | |
488 | compress_name); | |
489 | message = msg_buf; | |
490 | } | |
df37bd15 | 491 | } else |
e5eed351 | 492 | error("invalid magic at start of compressed archive"); |
1da177e4 | 493 | if (state != Reset) |
e5eed351 | 494 | error("junk at the end of compressed archive"); |
30d65dbf AK |
495 | this_header = saved_offset + my_inptr; |
496 | buf += my_inptr; | |
497 | len -= my_inptr; | |
1da177e4 | 498 | } |
889d51a1 | 499 | dir_utime(); |
3265e66b TP |
500 | kfree(name_buf); |
501 | kfree(symlink_buf); | |
502 | kfree(header_buf); | |
1da177e4 LT |
503 | return message; |
504 | } | |
505 | ||
0a7b35cb MN |
506 | static int __initdata do_retain_initrd; |
507 | ||
508 | static int __init retain_initrd_param(char *str) | |
509 | { | |
510 | if (*str) | |
511 | return 0; | |
512 | do_retain_initrd = 1; | |
513 | return 1; | |
514 | } | |
515 | __setup("retain_initrd", retain_initrd_param); | |
516 | ||
d8ae8a37 CH |
517 | #ifdef CONFIG_ARCH_HAS_KEEPINITRD |
518 | static int __init keepinitrd_setup(char *__unused) | |
519 | { | |
520 | do_retain_initrd = 1; | |
521 | return 1; | |
522 | } | |
523 | __setup("keepinitrd", keepinitrd_setup); | |
524 | #endif | |
525 | ||
ffe8018c HB |
526 | extern char __initramfs_start[]; |
527 | extern unsigned long __initramfs_size; | |
1da177e4 | 528 | #include <linux/initrd.h> |
9c15e852 | 529 | #include <linux/kexec.h> |
0f3d2bd5 | 530 | |
4afd58e1 CH |
531 | void __weak free_initrd_mem(unsigned long start, unsigned long end) |
532 | { | |
899ee4af MR |
533 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
534 | unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); | |
535 | unsigned long aligned_end = ALIGN(end, PAGE_SIZE); | |
536 | ||
537 | memblock_free(__pa(aligned_start), aligned_end - aligned_start); | |
538 | #endif | |
539 | ||
f94f7434 CH |
540 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
541 | "initrd"); | |
4afd58e1 CH |
542 | } |
543 | ||
2965faa5 | 544 | #ifdef CONFIG_KEXEC_CORE |
23091e28 CH |
545 | static bool kexec_free_initrd(void) |
546 | { | |
9c15e852 HM |
547 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
548 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
549 | ||
550 | /* | |
551 | * If the initrd region is overlapped with crashkernel reserved region, | |
552 | * free only memory that is not part of crashkernel region. | |
553 | */ | |
23091e28 CH |
554 | if (initrd_start >= crashk_end || initrd_end <= crashk_start) |
555 | return false; | |
556 | ||
557 | /* | |
558 | * Initialize initrd memory region since the kexec boot does not do. | |
559 | */ | |
560 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
561 | if (initrd_start < crashk_start) | |
562 | free_initrd_mem(initrd_start, crashk_start); | |
563 | if (initrd_end > crashk_end) | |
564 | free_initrd_mem(crashk_end, initrd_end); | |
565 | return true; | |
0f3d2bd5 | 566 | } |
23091e28 CH |
567 | #else |
568 | static inline bool kexec_free_initrd(void) | |
569 | { | |
570 | return false; | |
571 | } | |
572 | #endif /* CONFIG_KEXEC_CORE */ | |
0f3d2bd5 | 573 | |
a841c673 | 574 | #ifdef CONFIG_BLK_DEV_RAM |
df52092f LS |
575 | #define BUF_SIZE 1024 |
576 | static void __init clean_rootfs(void) | |
577 | { | |
578 | int fd; | |
579 | void *buf; | |
580 | struct linux_dirent64 *dirp; | |
8aaed5be | 581 | int num; |
df52092f | 582 | |
bae217ea | 583 | fd = ksys_open("/", O_RDONLY, 0); |
df52092f LS |
584 | WARN_ON(fd < 0); |
585 | if (fd < 0) | |
586 | return; | |
587 | buf = kzalloc(BUF_SIZE, GFP_KERNEL); | |
588 | WARN_ON(!buf); | |
589 | if (!buf) { | |
2ca2a09d | 590 | ksys_close(fd); |
df52092f LS |
591 | return; |
592 | } | |
593 | ||
594 | dirp = buf; | |
454dab3f | 595 | num = ksys_getdents64(fd, dirp, BUF_SIZE); |
8aaed5be HS |
596 | while (num > 0) { |
597 | while (num > 0) { | |
046aa126 | 598 | struct kstat st; |
df52092f LS |
599 | int ret; |
600 | ||
046aa126 | 601 | ret = vfs_lstat(dirp->d_name, &st); |
df52092f LS |
602 | WARN_ON_ONCE(ret); |
603 | if (!ret) { | |
046aa126 | 604 | if (S_ISDIR(st.mode)) |
f459dffa | 605 | ksys_rmdir(dirp->d_name); |
df52092f | 606 | else |
0f32ab8c | 607 | ksys_unlink(dirp->d_name); |
df52092f LS |
608 | } |
609 | ||
8aaed5be | 610 | num -= dirp->d_reclen; |
df52092f LS |
611 | dirp = (void *)dirp + dirp->d_reclen; |
612 | } | |
613 | dirp = buf; | |
614 | memset(buf, 0, BUF_SIZE); | |
454dab3f | 615 | num = ksys_getdents64(fd, dirp, BUF_SIZE); |
df52092f LS |
616 | } |
617 | ||
2ca2a09d | 618 | ksys_close(fd); |
df52092f LS |
619 | kfree(buf); |
620 | } | |
afef7889 CH |
621 | #else |
622 | static inline void clean_rootfs(void) | |
623 | { | |
624 | } | |
625 | #endif /* CONFIG_BLK_DEV_RAM */ | |
df52092f | 626 | |
7c184ecd | 627 | #ifdef CONFIG_BLK_DEV_RAM |
4ada1e81 | 628 | static void __init populate_initrd_image(char *err) |
7c184ecd CH |
629 | { |
630 | ssize_t written; | |
631 | int fd; | |
632 | ||
633 | unpack_to_rootfs(__initramfs_start, __initramfs_size); | |
634 | ||
635 | printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", | |
636 | err); | |
637 | fd = ksys_open("/initrd.image", O_WRONLY | O_CREAT, 0700); | |
638 | if (fd < 0) | |
639 | return; | |
640 | ||
641 | written = xwrite(fd, (char *)initrd_start, initrd_end - initrd_start); | |
642 | if (written != initrd_end - initrd_start) | |
643 | pr_err("/initrd.image: incomplete write (%zd != %ld)\n", | |
644 | written, initrd_end - initrd_start); | |
645 | ksys_close(fd); | |
646 | } | |
afef7889 | 647 | #else |
4ada1e81 | 648 | static void __init populate_initrd_image(char *err) |
afef7889 CH |
649 | { |
650 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); | |
651 | } | |
7c184ecd CH |
652 | #endif /* CONFIG_BLK_DEV_RAM */ |
653 | ||
9a9e0d68 | 654 | static int __init populate_rootfs(void) |
1da177e4 | 655 | { |
17a9be31 | 656 | /* Load the built in initramfs */ |
ffe8018c | 657 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
1da177e4 | 658 | if (err) |
499a4584 | 659 | panic("%s", err); /* Failed to decompress INTERNAL initramfs */ |
afef7889 CH |
660 | |
661 | if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) | |
662 | goto done; | |
663 | ||
664 | if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) | |
a1e6b6c1 | 665 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
afef7889 CH |
666 | else |
667 | printk(KERN_INFO "Unpacking initramfs...\n"); | |
54c7a891 | 668 | |
afef7889 CH |
669 | err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); |
670 | if (err) { | |
54c7a891 | 671 | clean_rootfs(); |
7c184ecd | 672 | populate_initrd_image(err); |
1da177e4 | 673 | } |
23091e28 | 674 | |
afef7889 | 675 | done: |
23091e28 CH |
676 | /* |
677 | * If the initrd region is overlapped with crashkernel reserved region, | |
678 | * free only memory that is not part of crashkernel region. | |
679 | */ | |
5d59aa8f | 680 | if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) |
23091e28 CH |
681 | free_initrd_mem(initrd_start, initrd_end); |
682 | initrd_start = 0; | |
683 | initrd_end = 0; | |
684 | ||
17a9be31 | 685 | flush_delayed_fput(); |
8d610dd5 | 686 | return 0; |
1da177e4 | 687 | } |
8d610dd5 | 688 | rootfs_initcall(populate_rootfs); |