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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> |
b2a74d5f | 14 | #include <linux/namei.h> |
1da177e4 | 15 | |
bf6419e4 CH |
16 | static ssize_t __init xwrite(struct file *file, const char *p, size_t count, |
17 | loff_t *pos) | |
38747439 YL |
18 | { |
19 | ssize_t out = 0; | |
20 | ||
21 | /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ | |
22 | while (count) { | |
bf6419e4 | 23 | ssize_t rv = kernel_write(file, p, count, pos); |
38747439 YL |
24 | |
25 | if (rv < 0) { | |
26 | if (rv == -EINTR || rv == -EAGAIN) | |
27 | continue; | |
28 | return out ? out : rv; | |
29 | } else if (rv == 0) | |
30 | break; | |
31 | ||
32 | p += rv; | |
33 | out += rv; | |
34 | count -= rv; | |
35 | } | |
36 | ||
37 | return out; | |
38 | } | |
39 | ||
1da177e4 LT |
40 | static __initdata char *message; |
41 | static void __init error(char *x) | |
42 | { | |
43 | if (!message) | |
44 | message = x; | |
45 | } | |
46 | ||
1da177e4 LT |
47 | /* link hash */ |
48 | ||
6a050da4 MH |
49 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
50 | ||
1da177e4 LT |
51 | static __initdata struct hash { |
52 | int ino, minor, major; | |
685dd2d5 | 53 | umode_t mode; |
1da177e4 | 54 | struct hash *next; |
6a050da4 | 55 | char name[N_ALIGN(PATH_MAX)]; |
1da177e4 LT |
56 | } *head[32]; |
57 | ||
58 | static inline int hash(int major, int minor, int ino) | |
59 | { | |
60 | unsigned long tmp = ino + minor + (major << 3); | |
61 | tmp += tmp >> 5; | |
62 | return tmp & 31; | |
63 | } | |
64 | ||
2139a7fb | 65 | static char __init *find_link(int major, int minor, int ino, |
685dd2d5 | 66 | umode_t mode, char *name) |
1da177e4 LT |
67 | { |
68 | struct hash **p, *q; | |
69 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { | |
70 | if ((*p)->ino != ino) | |
71 | continue; | |
72 | if ((*p)->minor != minor) | |
73 | continue; | |
74 | if ((*p)->major != major) | |
75 | continue; | |
2139a7fb PA |
76 | if (((*p)->mode ^ mode) & S_IFMT) |
77 | continue; | |
1da177e4 LT |
78 | return (*p)->name; |
79 | } | |
3265e66b | 80 | q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
1da177e4 LT |
81 | if (!q) |
82 | panic("can't allocate link hash entry"); | |
1da177e4 | 83 | q->major = major; |
2139a7fb PA |
84 | q->minor = minor; |
85 | q->ino = ino; | |
86 | q->mode = mode; | |
6a050da4 | 87 | strcpy(q->name, name); |
1da177e4 LT |
88 | q->next = NULL; |
89 | *p = q; | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | static void __init free_hash(void) | |
94 | { | |
95 | struct hash **p, *q; | |
96 | for (p = head; p < head + 32; p++) { | |
97 | while (*p) { | |
98 | q = *p; | |
99 | *p = q->next; | |
3265e66b | 100 | kfree(q); |
1da177e4 LT |
101 | } |
102 | } | |
103 | } | |
104 | ||
e35c4c64 | 105 | static long __init do_utime(char *filename, time64_t mtime) |
889d51a1 | 106 | { |
aaed2dd8 | 107 | struct timespec64 t[2]; |
889d51a1 NL |
108 | |
109 | t[0].tv_sec = mtime; | |
110 | t[0].tv_nsec = 0; | |
111 | t[1].tv_sec = mtime; | |
112 | t[1].tv_nsec = 0; | |
113 | ||
114 | return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); | |
115 | } | |
116 | ||
117 | static __initdata LIST_HEAD(dir_list); | |
118 | struct dir_entry { | |
119 | struct list_head list; | |
120 | char *name; | |
e35c4c64 | 121 | time64_t mtime; |
889d51a1 NL |
122 | }; |
123 | ||
e35c4c64 | 124 | static void __init dir_add(const char *name, time64_t mtime) |
889d51a1 NL |
125 | { |
126 | struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); | |
127 | if (!de) | |
128 | panic("can't allocate dir_entry buffer"); | |
129 | INIT_LIST_HEAD(&de->list); | |
130 | de->name = kstrdup(name, GFP_KERNEL); | |
131 | de->mtime = mtime; | |
132 | list_add(&de->list, &dir_list); | |
133 | } | |
134 | ||
135 | static void __init dir_utime(void) | |
136 | { | |
137 | struct dir_entry *de, *tmp; | |
138 | list_for_each_entry_safe(de, tmp, &dir_list, list) { | |
139 | list_del(&de->list); | |
140 | do_utime(de->name, de->mtime); | |
141 | kfree(de->name); | |
142 | kfree(de); | |
143 | } | |
144 | } | |
145 | ||
e35c4c64 | 146 | static __initdata time64_t mtime; |
889d51a1 | 147 | |
1da177e4 LT |
148 | /* cpio header parsing */ |
149 | ||
150 | static __initdata unsigned long ino, major, minor, nlink; | |
685dd2d5 | 151 | static __initdata umode_t mode; |
1da177e4 LT |
152 | static __initdata unsigned long body_len, name_len; |
153 | static __initdata uid_t uid; | |
154 | static __initdata gid_t gid; | |
155 | static __initdata unsigned rdev; | |
156 | ||
157 | static void __init parse_header(char *s) | |
158 | { | |
159 | unsigned long parsed[12]; | |
160 | char buf[9]; | |
161 | int i; | |
162 | ||
163 | buf[8] = '\0'; | |
164 | for (i = 0, s += 6; i < 12; i++, s += 8) { | |
165 | memcpy(buf, s, 8); | |
166 | parsed[i] = simple_strtoul(buf, NULL, 16); | |
167 | } | |
168 | ino = parsed[0]; | |
169 | mode = parsed[1]; | |
170 | uid = parsed[2]; | |
171 | gid = parsed[3]; | |
172 | nlink = parsed[4]; | |
e35c4c64 | 173 | mtime = parsed[5]; /* breaks in y2106 */ |
1da177e4 LT |
174 | body_len = parsed[6]; |
175 | major = parsed[7]; | |
176 | minor = parsed[8]; | |
177 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); | |
178 | name_len = parsed[11]; | |
179 | } | |
180 | ||
181 | /* FSM */ | |
182 | ||
183 | static __initdata enum state { | |
184 | Start, | |
185 | Collect, | |
186 | GotHeader, | |
187 | SkipIt, | |
188 | GotName, | |
189 | CopyFile, | |
190 | GotSymlink, | |
191 | Reset | |
192 | } state, next_state; | |
193 | ||
194 | static __initdata char *victim; | |
c34d85ac | 195 | static unsigned long byte_count __initdata; |
1da177e4 LT |
196 | static __initdata loff_t this_header, next_header; |
197 | ||
b0a5ab93 | 198 | static inline void __init eat(unsigned n) |
1da177e4 LT |
199 | { |
200 | victim += n; | |
201 | this_header += n; | |
c34d85ac | 202 | byte_count -= n; |
1da177e4 LT |
203 | } |
204 | ||
889d51a1 | 205 | static __initdata char *vcollected; |
1da177e4 | 206 | static __initdata char *collected; |
d97b07c5 | 207 | static long remains __initdata; |
1da177e4 LT |
208 | static __initdata char *collect; |
209 | ||
210 | static void __init read_into(char *buf, unsigned size, enum state next) | |
211 | { | |
c34d85ac | 212 | if (byte_count >= size) { |
1da177e4 LT |
213 | collected = victim; |
214 | eat(size); | |
215 | state = next; | |
216 | } else { | |
217 | collect = collected = buf; | |
218 | remains = size; | |
219 | next_state = next; | |
220 | state = Collect; | |
221 | } | |
222 | } | |
223 | ||
224 | static __initdata char *header_buf, *symlink_buf, *name_buf; | |
225 | ||
226 | static int __init do_start(void) | |
227 | { | |
228 | read_into(header_buf, 110, GotHeader); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static int __init do_collect(void) | |
233 | { | |
d97b07c5 | 234 | unsigned long n = remains; |
c34d85ac MR |
235 | if (byte_count < n) |
236 | n = byte_count; | |
1da177e4 LT |
237 | memcpy(collect, victim, n); |
238 | eat(n); | |
239 | collect += n; | |
240 | if ((remains -= n) != 0) | |
241 | return 1; | |
242 | state = next_state; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static int __init do_header(void) | |
247 | { | |
2e591bbc AV |
248 | if (memcmp(collected, "070707", 6)==0) { |
249 | error("incorrect cpio method used: use -H newc option"); | |
250 | return 1; | |
251 | } | |
1da177e4 LT |
252 | if (memcmp(collected, "070701", 6)) { |
253 | error("no cpio magic"); | |
254 | return 1; | |
255 | } | |
256 | parse_header(collected); | |
257 | next_header = this_header + N_ALIGN(name_len) + body_len; | |
258 | next_header = (next_header + 3) & ~3; | |
1da177e4 LT |
259 | state = SkipIt; |
260 | if (name_len <= 0 || name_len > PATH_MAX) | |
261 | return 0; | |
262 | if (S_ISLNK(mode)) { | |
263 | if (body_len > PATH_MAX) | |
264 | return 0; | |
265 | collect = collected = symlink_buf; | |
266 | remains = N_ALIGN(name_len) + body_len; | |
267 | next_state = GotSymlink; | |
268 | state = Collect; | |
269 | return 0; | |
270 | } | |
271 | if (S_ISREG(mode) || !body_len) | |
272 | read_into(name_buf, N_ALIGN(name_len), GotName); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static int __init do_skip(void) | |
277 | { | |
c34d85ac MR |
278 | if (this_header + byte_count < next_header) { |
279 | eat(byte_count); | |
1da177e4 LT |
280 | return 1; |
281 | } else { | |
282 | eat(next_header - this_header); | |
283 | state = next_state; | |
284 | return 0; | |
285 | } | |
286 | } | |
287 | ||
288 | static int __init do_reset(void) | |
289 | { | |
c34d85ac | 290 | while (byte_count && *victim == '\0') |
1da177e4 | 291 | eat(1); |
c34d85ac | 292 | if (byte_count && (this_header & 3)) |
1da177e4 LT |
293 | error("broken padding"); |
294 | return 1; | |
295 | } | |
296 | ||
c34d85ac | 297 | static void __init clean_path(char *path, umode_t fmode) |
2139a7fb | 298 | { |
046aa126 | 299 | struct kstat st; |
2139a7fb | 300 | |
046aa126 AB |
301 | if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) { |
302 | if (S_ISDIR(st.mode)) | |
f459dffa | 303 | ksys_rmdir(path); |
2139a7fb | 304 | else |
0f32ab8c | 305 | ksys_unlink(path); |
2139a7fb PA |
306 | } |
307 | } | |
308 | ||
7c0950d4 LZ |
309 | static int __init maybe_link(void) |
310 | { | |
311 | if (nlink >= 2) { | |
312 | char *old = find_link(major, minor, ino, mode, collected); | |
313 | if (old) { | |
314 | clean_path(collected, 0); | |
315 | return (ksys_link(old, collected) < 0) ? -1 : 1; | |
316 | } | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
bf6419e4 CH |
321 | static __initdata struct file *wfile; |
322 | static __initdata loff_t wfile_pos; | |
1da177e4 LT |
323 | |
324 | static int __init do_name(void) | |
325 | { | |
326 | state = SkipIt; | |
327 | next_state = Reset; | |
328 | if (strcmp(collected, "TRAILER!!!") == 0) { | |
329 | free_hash(); | |
330 | return 0; | |
331 | } | |
2139a7fb | 332 | clean_path(collected, mode); |
1da177e4 | 333 | if (S_ISREG(mode)) { |
2139a7fb PA |
334 | int ml = maybe_link(); |
335 | if (ml >= 0) { | |
336 | int openflags = O_WRONLY|O_CREAT; | |
337 | if (ml != 1) | |
338 | openflags |= O_TRUNC; | |
bf6419e4 CH |
339 | wfile = filp_open(collected, openflags, mode); |
340 | if (IS_ERR(wfile)) | |
341 | return 0; | |
342 | wfile_pos = 0; | |
343 | ||
344 | vfs_fchown(wfile, uid, gid); | |
345 | vfs_fchmod(wfile, mode); | |
346 | if (body_len) | |
347 | vfs_truncate(&wfile->f_path, body_len); | |
348 | vcollected = kstrdup(collected, GFP_KERNEL); | |
349 | state = CopyFile; | |
1da177e4 LT |
350 | } |
351 | } else if (S_ISDIR(mode)) { | |
0101db7a | 352 | ksys_mkdir(collected, mode); |
55731b3c | 353 | ksys_chown(collected, uid, gid); |
03450e27 | 354 | ksys_chmod(collected, mode); |
889d51a1 | 355 | dir_add(collected, mtime); |
1da177e4 LT |
356 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
357 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
358 | if (maybe_link() == 0) { | |
87c4e192 | 359 | ksys_mknod(collected, mode, rdev); |
55731b3c | 360 | ksys_chown(collected, uid, gid); |
03450e27 | 361 | ksys_chmod(collected, mode); |
889d51a1 | 362 | do_utime(collected, mtime); |
1da177e4 LT |
363 | } |
364 | } | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static int __init do_copy(void) | |
369 | { | |
c34d85ac | 370 | if (byte_count >= body_len) { |
bf6419e4 | 371 | if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) |
9687fd91 | 372 | error("write error"); |
bf6419e4 | 373 | fput(wfile); |
889d51a1 NL |
374 | do_utime(vcollected, mtime); |
375 | kfree(vcollected); | |
1da177e4 LT |
376 | eat(body_len); |
377 | state = SkipIt; | |
378 | return 0; | |
379 | } else { | |
bf6419e4 | 380 | if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) |
9687fd91 | 381 | error("write error"); |
c34d85ac MR |
382 | body_len -= byte_count; |
383 | eat(byte_count); | |
1da177e4 LT |
384 | return 1; |
385 | } | |
386 | } | |
387 | ||
388 | static int __init do_symlink(void) | |
389 | { | |
390 | collected[N_ALIGN(name_len) + body_len] = '\0'; | |
2139a7fb | 391 | clean_path(collected, 0); |
b724e846 | 392 | ksys_symlink(collected + N_ALIGN(name_len), collected); |
55731b3c | 393 | ksys_lchown(collected, uid, gid); |
889d51a1 | 394 | do_utime(collected, mtime); |
1da177e4 LT |
395 | state = SkipIt; |
396 | next_state = Reset; | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static __initdata int (*actions[])(void) = { | |
401 | [Start] = do_start, | |
402 | [Collect] = do_collect, | |
403 | [GotHeader] = do_header, | |
404 | [SkipIt] = do_skip, | |
405 | [GotName] = do_name, | |
406 | [CopyFile] = do_copy, | |
407 | [GotSymlink] = do_symlink, | |
408 | [Reset] = do_reset, | |
409 | }; | |
410 | ||
d97b07c5 | 411 | static long __init write_buffer(char *buf, unsigned long len) |
1da177e4 | 412 | { |
c34d85ac | 413 | byte_count = len; |
1da177e4 LT |
414 | victim = buf; |
415 | ||
416 | while (!actions[state]()) | |
417 | ; | |
c34d85ac | 418 | return len - byte_count; |
1da177e4 LT |
419 | } |
420 | ||
d97b07c5 | 421 | static long __init flush_buffer(void *bufv, unsigned long len) |
1da177e4 | 422 | { |
30d65dbf | 423 | char *buf = (char *) bufv; |
d97b07c5 YL |
424 | long written; |
425 | long origLen = len; | |
1da177e4 | 426 | if (message) |
30d65dbf | 427 | return -1; |
1da177e4 LT |
428 | while ((written = write_buffer(buf, len)) < len && !message) { |
429 | char c = buf[written]; | |
430 | if (c == '0') { | |
431 | buf += written; | |
432 | len -= written; | |
433 | state = Start; | |
434 | } else if (c == 0) { | |
435 | buf += written; | |
436 | len -= written; | |
437 | state = Reset; | |
438 | } else | |
e5eed351 | 439 | error("junk within compressed archive"); |
1da177e4 | 440 | } |
30d65dbf | 441 | return origLen; |
1da177e4 LT |
442 | } |
443 | ||
d97b07c5 | 444 | static unsigned long my_inptr; /* index of next byte to be processed in inbuf */ |
1da177e4 | 445 | |
889c92d2 | 446 | #include <linux/decompress/generic.h> |
1da177e4 | 447 | |
d97b07c5 | 448 | static char * __init unpack_to_rootfs(char *buf, unsigned long len) |
1da177e4 | 449 | { |
d97b07c5 | 450 | long written; |
889c92d2 | 451 | decompress_fn decompress; |
23a22d57 PA |
452 | const char *compress_name; |
453 | static __initdata char msg_buf[64]; | |
889c92d2 | 454 | |
3265e66b TP |
455 | header_buf = kmalloc(110, GFP_KERNEL); |
456 | symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); | |
457 | name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); | |
30d65dbf AK |
458 | |
459 | if (!header_buf || !symlink_buf || !name_buf) | |
1da177e4 | 460 | panic("can't allocate buffers"); |
30d65dbf | 461 | |
1da177e4 LT |
462 | state = Start; |
463 | this_header = 0; | |
464 | message = NULL; | |
465 | while (!message && len) { | |
466 | loff_t saved_offset = this_header; | |
467 | if (*buf == '0' && !(this_header & 3)) { | |
468 | state = Start; | |
469 | written = write_buffer(buf, len); | |
470 | buf += written; | |
471 | len -= written; | |
472 | continue; | |
473 | } | |
474 | if (!*buf) { | |
475 | buf++; | |
476 | len--; | |
477 | this_header++; | |
478 | continue; | |
479 | } | |
480 | this_header = 0; | |
23a22d57 | 481 | decompress = decompress_method(buf, len, &compress_name); |
6aa7a29a | 482 | pr_debug("Detected %s compressed data\n", compress_name); |
54291362 | 483 | if (decompress) { |
d97b07c5 | 484 | int res = decompress(buf, len, NULL, flush_buffer, NULL, |
889c92d2 | 485 | &my_inptr, error); |
54291362 PL |
486 | if (res) |
487 | error("decompressor failed"); | |
488 | } else if (compress_name) { | |
23a22d57 PA |
489 | if (!message) { |
490 | snprintf(msg_buf, sizeof msg_buf, | |
491 | "compression method %s not configured", | |
492 | compress_name); | |
493 | message = msg_buf; | |
494 | } | |
df37bd15 | 495 | } else |
e5eed351 | 496 | error("invalid magic at start of compressed archive"); |
1da177e4 | 497 | if (state != Reset) |
e5eed351 | 498 | error("junk at the end of compressed archive"); |
30d65dbf AK |
499 | this_header = saved_offset + my_inptr; |
500 | buf += my_inptr; | |
501 | len -= my_inptr; | |
1da177e4 | 502 | } |
889d51a1 | 503 | dir_utime(); |
3265e66b TP |
504 | kfree(name_buf); |
505 | kfree(symlink_buf); | |
506 | kfree(header_buf); | |
1da177e4 LT |
507 | return message; |
508 | } | |
509 | ||
0a7b35cb MN |
510 | static int __initdata do_retain_initrd; |
511 | ||
512 | static int __init retain_initrd_param(char *str) | |
513 | { | |
514 | if (*str) | |
515 | return 0; | |
516 | do_retain_initrd = 1; | |
517 | return 1; | |
518 | } | |
519 | __setup("retain_initrd", retain_initrd_param); | |
520 | ||
d8ae8a37 CH |
521 | #ifdef CONFIG_ARCH_HAS_KEEPINITRD |
522 | static int __init keepinitrd_setup(char *__unused) | |
523 | { | |
524 | do_retain_initrd = 1; | |
525 | return 1; | |
526 | } | |
527 | __setup("keepinitrd", keepinitrd_setup); | |
528 | #endif | |
529 | ||
ffe8018c HB |
530 | extern char __initramfs_start[]; |
531 | extern unsigned long __initramfs_size; | |
1da177e4 | 532 | #include <linux/initrd.h> |
9c15e852 | 533 | #include <linux/kexec.h> |
0f3d2bd5 | 534 | |
4afd58e1 CH |
535 | void __weak free_initrd_mem(unsigned long start, unsigned long end) |
536 | { | |
899ee4af MR |
537 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
538 | unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE); | |
539 | unsigned long aligned_end = ALIGN(end, PAGE_SIZE); | |
540 | ||
541 | memblock_free(__pa(aligned_start), aligned_end - aligned_start); | |
542 | #endif | |
543 | ||
f94f7434 CH |
544 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
545 | "initrd"); | |
4afd58e1 CH |
546 | } |
547 | ||
2965faa5 | 548 | #ifdef CONFIG_KEXEC_CORE |
e99332e7 | 549 | static bool __init kexec_free_initrd(void) |
23091e28 | 550 | { |
9c15e852 HM |
551 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
552 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); | |
553 | ||
554 | /* | |
555 | * If the initrd region is overlapped with crashkernel reserved region, | |
556 | * free only memory that is not part of crashkernel region. | |
557 | */ | |
23091e28 CH |
558 | if (initrd_start >= crashk_end || initrd_end <= crashk_start) |
559 | return false; | |
560 | ||
561 | /* | |
562 | * Initialize initrd memory region since the kexec boot does not do. | |
563 | */ | |
564 | memset((void *)initrd_start, 0, initrd_end - initrd_start); | |
565 | if (initrd_start < crashk_start) | |
566 | free_initrd_mem(initrd_start, crashk_start); | |
567 | if (initrd_end > crashk_end) | |
568 | free_initrd_mem(crashk_end, initrd_end); | |
569 | return true; | |
0f3d2bd5 | 570 | } |
23091e28 CH |
571 | #else |
572 | static inline bool kexec_free_initrd(void) | |
573 | { | |
574 | return false; | |
575 | } | |
576 | #endif /* CONFIG_KEXEC_CORE */ | |
0f3d2bd5 | 577 | |
a841c673 | 578 | #ifdef CONFIG_BLK_DEV_RAM |
4ada1e81 | 579 | static void __init populate_initrd_image(char *err) |
7c184ecd CH |
580 | { |
581 | ssize_t written; | |
bf6419e4 CH |
582 | struct file *file; |
583 | loff_t pos = 0; | |
7c184ecd CH |
584 | |
585 | unpack_to_rootfs(__initramfs_start, __initramfs_size); | |
586 | ||
587 | printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", | |
588 | err); | |
bf6419e4 CH |
589 | file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700); |
590 | if (IS_ERR(file)) | |
7c184ecd CH |
591 | return; |
592 | ||
bf6419e4 CH |
593 | written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, |
594 | &pos); | |
7c184ecd CH |
595 | if (written != initrd_end - initrd_start) |
596 | pr_err("/initrd.image: incomplete write (%zd != %ld)\n", | |
597 | written, initrd_end - initrd_start); | |
bf6419e4 | 598 | fput(file); |
7c184ecd CH |
599 | } |
600 | #endif /* CONFIG_BLK_DEV_RAM */ | |
601 | ||
9a9e0d68 | 602 | static int __init populate_rootfs(void) |
1da177e4 | 603 | { |
17a9be31 | 604 | /* Load the built in initramfs */ |
ffe8018c | 605 | char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
1da177e4 | 606 | if (err) |
499a4584 | 607 | panic("%s", err); /* Failed to decompress INTERNAL initramfs */ |
afef7889 CH |
608 | |
609 | if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE)) | |
610 | goto done; | |
611 | ||
612 | if (IS_ENABLED(CONFIG_BLK_DEV_RAM)) | |
a1e6b6c1 | 613 | printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n"); |
afef7889 CH |
614 | else |
615 | printk(KERN_INFO "Unpacking initramfs...\n"); | |
54c7a891 | 616 | |
afef7889 CH |
617 | err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start); |
618 | if (err) { | |
9ab6b718 | 619 | #ifdef CONFIG_BLK_DEV_RAM |
7c184ecd | 620 | populate_initrd_image(err); |
9ab6b718 CH |
621 | #else |
622 | printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); | |
623 | #endif | |
1da177e4 | 624 | } |
23091e28 | 625 | |
afef7889 | 626 | done: |
23091e28 CH |
627 | /* |
628 | * If the initrd region is overlapped with crashkernel reserved region, | |
629 | * free only memory that is not part of crashkernel region. | |
630 | */ | |
5d59aa8f | 631 | if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) |
23091e28 CH |
632 | free_initrd_mem(initrd_start, initrd_end); |
633 | initrd_start = 0; | |
634 | initrd_end = 0; | |
635 | ||
17a9be31 | 636 | flush_delayed_fput(); |
8d610dd5 | 637 | return 0; |
1da177e4 | 638 | } |
8d610dd5 | 639 | rootfs_initcall(populate_rootfs); |