blob: a8497fab1c3d64950370fb54401493e9eeac0621 [file] [log] [blame]
H Hartley Sweetenc67e5382012-05-31 16:26:10 -07001/*
2 * Many of the syscalls used in this file expect some of the arguments
3 * to be __user pointers not __kernel pointers. To limit the sparse
4 * noise, turn off sparse checking for this file.
5 */
6#ifdef __CHECKER__
7#undef __CHECKER__
8#warning "Sparse checking disabled for this file"
9#endif
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15#include <linux/fcntl.h>
16#include <linux/delay.h>
17#include <linux/string.h>
Li, Shaohuadf520922008-08-13 17:26:01 +080018#include <linux/dirent.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/syscalls.h>
Nye Liu889d51a2008-10-15 22:01:40 -070020#include <linux/utime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22static __initdata char *message;
23static void __init error(char *x)
24{
25 if (!message)
26 message = x;
27}
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029/* link hash */
30
Mark Huang6a050da2006-05-15 09:44:03 -070031#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static __initdata struct hash {
34 int ino, minor, major;
Al Viro685dd2d2011-07-26 04:34:13 -040035 umode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 struct hash *next;
Mark Huang6a050da2006-05-15 09:44:03 -070037 char name[N_ALIGN(PATH_MAX)];
Linus Torvalds1da177e2005-04-16 15:20:36 -070038} *head[32];
39
40static inline int hash(int major, int minor, int ino)
41{
42 unsigned long tmp = ino + minor + (major << 3);
43 tmp += tmp >> 5;
44 return tmp & 31;
45}
46
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070047static char __init *find_link(int major, int minor, int ino,
Al Viro685dd2d2011-07-26 04:34:13 -040048 umode_t mode, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 struct hash **p, *q;
51 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
52 if ((*p)->ino != ino)
53 continue;
54 if ((*p)->minor != minor)
55 continue;
56 if ((*p)->major != major)
57 continue;
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070058 if (((*p)->mode ^ mode) & S_IFMT)
59 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return (*p)->name;
61 }
Thomas Petazzoni3265e662008-04-29 00:59:43 -070062 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 if (!q)
64 panic("can't allocate link hash entry");
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 q->major = major;
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070066 q->minor = minor;
67 q->ino = ino;
68 q->mode = mode;
Mark Huang6a050da2006-05-15 09:44:03 -070069 strcpy(q->name, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 q->next = NULL;
71 *p = q;
72 return NULL;
73}
74
75static void __init free_hash(void)
76{
77 struct hash **p, *q;
78 for (p = head; p < head + 32; p++) {
79 while (*p) {
80 q = *p;
81 *p = q->next;
Thomas Petazzoni3265e662008-04-29 00:59:43 -070082 kfree(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 }
84 }
85}
86
H Hartley Sweetenc67e5382012-05-31 16:26:10 -070087static long __init do_utime(char *filename, time_t mtime)
Nye Liu889d51a2008-10-15 22:01:40 -070088{
89 struct timespec t[2];
90
91 t[0].tv_sec = mtime;
92 t[0].tv_nsec = 0;
93 t[1].tv_sec = mtime;
94 t[1].tv_nsec = 0;
95
96 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
97}
98
99static __initdata LIST_HEAD(dir_list);
100struct dir_entry {
101 struct list_head list;
102 char *name;
103 time_t mtime;
104};
105
106static void __init dir_add(const char *name, time_t mtime)
107{
108 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
109 if (!de)
110 panic("can't allocate dir_entry buffer");
111 INIT_LIST_HEAD(&de->list);
112 de->name = kstrdup(name, GFP_KERNEL);
113 de->mtime = mtime;
114 list_add(&de->list, &dir_list);
115}
116
117static void __init dir_utime(void)
118{
119 struct dir_entry *de, *tmp;
120 list_for_each_entry_safe(de, tmp, &dir_list, list) {
121 list_del(&de->list);
122 do_utime(de->name, de->mtime);
123 kfree(de->name);
124 kfree(de);
125 }
126}
127
128static __initdata time_t mtime;
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/* cpio header parsing */
131
132static __initdata unsigned long ino, major, minor, nlink;
Al Viro685dd2d2011-07-26 04:34:13 -0400133static __initdata umode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134static __initdata unsigned long body_len, name_len;
135static __initdata uid_t uid;
136static __initdata gid_t gid;
137static __initdata unsigned rdev;
138
139static void __init parse_header(char *s)
140{
141 unsigned long parsed[12];
142 char buf[9];
143 int i;
144
145 buf[8] = '\0';
146 for (i = 0, s += 6; i < 12; i++, s += 8) {
147 memcpy(buf, s, 8);
148 parsed[i] = simple_strtoul(buf, NULL, 16);
149 }
150 ino = parsed[0];
151 mode = parsed[1];
152 uid = parsed[2];
153 gid = parsed[3];
154 nlink = parsed[4];
Nye Liu889d51a2008-10-15 22:01:40 -0700155 mtime = parsed[5];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 body_len = parsed[6];
157 major = parsed[7];
158 minor = parsed[8];
159 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
160 name_len = parsed[11];
161}
162
163/* FSM */
164
165static __initdata enum state {
166 Start,
167 Collect,
168 GotHeader,
169 SkipIt,
170 GotName,
171 CopyFile,
172 GotSymlink,
173 Reset
174} state, next_state;
175
176static __initdata char *victim;
177static __initdata unsigned count;
178static __initdata loff_t this_header, next_header;
179
Al Virob0a5ab92007-07-26 17:33:59 +0100180static inline void __init eat(unsigned n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 victim += n;
183 this_header += n;
184 count -= n;
185}
186
Nye Liu889d51a2008-10-15 22:01:40 -0700187static __initdata char *vcollected;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static __initdata char *collected;
189static __initdata int remains;
190static __initdata char *collect;
191
192static void __init read_into(char *buf, unsigned size, enum state next)
193{
194 if (count >= size) {
195 collected = victim;
196 eat(size);
197 state = next;
198 } else {
199 collect = collected = buf;
200 remains = size;
201 next_state = next;
202 state = Collect;
203 }
204}
205
206static __initdata char *header_buf, *symlink_buf, *name_buf;
207
208static int __init do_start(void)
209{
210 read_into(header_buf, 110, GotHeader);
211 return 0;
212}
213
214static int __init do_collect(void)
215{
216 unsigned n = remains;
217 if (count < n)
218 n = count;
219 memcpy(collect, victim, n);
220 eat(n);
221 collect += n;
222 if ((remains -= n) != 0)
223 return 1;
224 state = next_state;
225 return 0;
226}
227
228static int __init do_header(void)
229{
Arjan van de Ven2e591bb2006-12-06 20:37:19 -0800230 if (memcmp(collected, "070707", 6)==0) {
231 error("incorrect cpio method used: use -H newc option");
232 return 1;
233 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (memcmp(collected, "070701", 6)) {
235 error("no cpio magic");
236 return 1;
237 }
238 parse_header(collected);
239 next_header = this_header + N_ALIGN(name_len) + body_len;
240 next_header = (next_header + 3) & ~3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 state = SkipIt;
242 if (name_len <= 0 || name_len > PATH_MAX)
243 return 0;
244 if (S_ISLNK(mode)) {
245 if (body_len > PATH_MAX)
246 return 0;
247 collect = collected = symlink_buf;
248 remains = N_ALIGN(name_len) + body_len;
249 next_state = GotSymlink;
250 state = Collect;
251 return 0;
252 }
253 if (S_ISREG(mode) || !body_len)
254 read_into(name_buf, N_ALIGN(name_len), GotName);
255 return 0;
256}
257
258static int __init do_skip(void)
259{
260 if (this_header + count < next_header) {
261 eat(count);
262 return 1;
263 } else {
264 eat(next_header - this_header);
265 state = next_state;
266 return 0;
267 }
268}
269
270static int __init do_reset(void)
271{
272 while(count && *victim == '\0')
273 eat(1);
274 if (count && (this_header & 3))
275 error("broken padding");
276 return 1;
277}
278
279static int __init maybe_link(void)
280{
281 if (nlink >= 2) {
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700282 char *old = find_link(major, minor, ino, mode, collected);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (old)
284 return (sys_link(old, collected) < 0) ? -1 : 1;
285 }
286 return 0;
287}
288
Al Viro685dd2d2011-07-26 04:34:13 -0400289static void __init clean_path(char *path, umode_t mode)
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700290{
291 struct stat st;
292
293 if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
294 if (S_ISDIR(st.st_mode))
295 sys_rmdir(path);
296 else
297 sys_unlink(path);
298 }
299}
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301static __initdata int wfd;
302
303static int __init do_name(void)
304{
305 state = SkipIt;
306 next_state = Reset;
307 if (strcmp(collected, "TRAILER!!!") == 0) {
308 free_hash();
309 return 0;
310 }
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700311 clean_path(collected, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if (S_ISREG(mode)) {
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700313 int ml = maybe_link();
314 if (ml >= 0) {
315 int openflags = O_WRONLY|O_CREAT;
316 if (ml != 1)
317 openflags |= O_TRUNC;
318 wfd = sys_open(collected, openflags, mode);
319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 if (wfd >= 0) {
321 sys_fchown(wfd, uid, gid);
322 sys_fchmod(wfd, mode);
Randy Robertsond20d5a72009-04-13 14:40:04 -0700323 if (body_len)
324 sys_ftruncate(wfd, body_len);
Nye Liu889d51a2008-10-15 22:01:40 -0700325 vcollected = kstrdup(collected, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 state = CopyFile;
327 }
328 }
329 } else if (S_ISDIR(mode)) {
330 sys_mkdir(collected, mode);
331 sys_chown(collected, uid, gid);
332 sys_chmod(collected, mode);
Nye Liu889d51a2008-10-15 22:01:40 -0700333 dir_add(collected, mtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
335 S_ISFIFO(mode) || S_ISSOCK(mode)) {
336 if (maybe_link() == 0) {
337 sys_mknod(collected, mode, rdev);
338 sys_chown(collected, uid, gid);
339 sys_chmod(collected, mode);
Nye Liu889d51a2008-10-15 22:01:40 -0700340 do_utime(collected, mtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
342 }
343 return 0;
344}
345
346static int __init do_copy(void)
347{
348 if (count >= body_len) {
349 sys_write(wfd, victim, body_len);
350 sys_close(wfd);
Nye Liu889d51a2008-10-15 22:01:40 -0700351 do_utime(vcollected, mtime);
352 kfree(vcollected);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 eat(body_len);
354 state = SkipIt;
355 return 0;
356 } else {
357 sys_write(wfd, victim, count);
358 body_len -= count;
359 eat(count);
360 return 1;
361 }
362}
363
364static int __init do_symlink(void)
365{
366 collected[N_ALIGN(name_len) + body_len] = '\0';
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700367 clean_path(collected, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 sys_symlink(collected + N_ALIGN(name_len), collected);
369 sys_lchown(collected, uid, gid);
Nye Liu889d51a2008-10-15 22:01:40 -0700370 do_utime(collected, mtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 state = SkipIt;
372 next_state = Reset;
373 return 0;
374}
375
376static __initdata int (*actions[])(void) = {
377 [Start] = do_start,
378 [Collect] = do_collect,
379 [GotHeader] = do_header,
380 [SkipIt] = do_skip,
381 [GotName] = do_name,
382 [CopyFile] = do_copy,
383 [GotSymlink] = do_symlink,
384 [Reset] = do_reset,
385};
386
387static int __init write_buffer(char *buf, unsigned len)
388{
389 count = len;
390 victim = buf;
391
392 while (!actions[state]())
393 ;
394 return len - count;
395}
396
Alain Knaff30d65db2009-01-04 22:46:17 +0100397static int __init flush_buffer(void *bufv, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
Alain Knaff30d65db2009-01-04 22:46:17 +0100399 char *buf = (char *) bufv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 int written;
Alain Knaff30d65db2009-01-04 22:46:17 +0100401 int origLen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 if (message)
Alain Knaff30d65db2009-01-04 22:46:17 +0100403 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 while ((written = write_buffer(buf, len)) < len && !message) {
405 char c = buf[written];
406 if (c == '0') {
407 buf += written;
408 len -= written;
409 state = Start;
410 } else if (c == 0) {
411 buf += written;
412 len -= written;
413 state = Reset;
414 } else
415 error("junk in compressed archive");
416 }
Alain Knaff30d65db2009-01-04 22:46:17 +0100417 return origLen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
Alain Knaff30d65db2009-01-04 22:46:17 +0100420static unsigned my_inptr; /* index of next byte to be processed in inbuf */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800422#include <linux/decompress/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Li, Shaohuadf520922008-08-13 17:26:01 +0800424static char * __init unpack_to_rootfs(char *buf, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
Phillip Lougher54291362009-12-14 21:45:19 +0000426 int written, res;
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800427 decompress_fn decompress;
H. Peter Anvin23a22d52009-01-12 14:24:04 -0800428 const char *compress_name;
429 static __initdata char msg_buf[64];
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800430
Thomas Petazzoni3265e662008-04-29 00:59:43 -0700431 header_buf = kmalloc(110, GFP_KERNEL);
432 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
433 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
Alain Knaff30d65db2009-01-04 22:46:17 +0100434
435 if (!header_buf || !symlink_buf || !name_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 panic("can't allocate buffers");
Alain Knaff30d65db2009-01-04 22:46:17 +0100437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 state = Start;
439 this_header = 0;
440 message = NULL;
441 while (!message && len) {
442 loff_t saved_offset = this_header;
443 if (*buf == '0' && !(this_header & 3)) {
444 state = Start;
445 written = write_buffer(buf, len);
446 buf += written;
447 len -= written;
448 continue;
449 }
450 if (!*buf) {
451 buf++;
452 len--;
453 this_header++;
454 continue;
455 }
456 this_header = 0;
H. Peter Anvin23a22d52009-01-12 14:24:04 -0800457 decompress = decompress_method(buf, len, &compress_name);
Daniel M. Weeks6aa7a292014-04-07 15:39:16 -0700458 pr_debug("Detected %s compressed data\n", compress_name);
Phillip Lougher54291362009-12-14 21:45:19 +0000459 if (decompress) {
460 res = decompress(buf, len, NULL, flush_buffer, NULL,
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800461 &my_inptr, error);
Phillip Lougher54291362009-12-14 21:45:19 +0000462 if (res)
463 error("decompressor failed");
464 } else if (compress_name) {
H. Peter Anvin23a22d52009-01-12 14:24:04 -0800465 if (!message) {
466 snprintf(msg_buf, sizeof msg_buf,
467 "compression method %s not configured",
468 compress_name);
469 message = msg_buf;
470 }
Phillip Lougherdf37bd12010-04-23 13:18:11 -0400471 } else
472 error("junk in compressed archive");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 if (state != Reset)
Alain Knaff30d65db2009-01-04 22:46:17 +0100474 error("junk in compressed archive");
475 this_header = saved_offset + my_inptr;
476 buf += my_inptr;
477 len -= my_inptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
Nye Liu889d51a2008-10-15 22:01:40 -0700479 dir_utime();
Thomas Petazzoni3265e662008-04-29 00:59:43 -0700480 kfree(name_buf);
481 kfree(symlink_buf);
482 kfree(header_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 return message;
484}
485
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800486static int __initdata do_retain_initrd;
487
488static int __init retain_initrd_param(char *str)
489{
490 if (*str)
491 return 0;
492 do_retain_initrd = 1;
493 return 1;
494}
495__setup("retain_initrd", retain_initrd_param);
496
Hendrik Bruecknerffe80182010-09-17 15:24:11 -0700497extern char __initramfs_start[];
498extern unsigned long __initramfs_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499#include <linux/initrd.h>
Haren Myneni9c15e852006-02-10 01:51:05 -0800500#include <linux/kexec.h>
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700501
502static void __init free_initrd(void)
503{
Haren Myneni9c15e852006-02-10 01:51:05 -0800504#ifdef CONFIG_KEXEC
505 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
506 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800507#endif
508 if (do_retain_initrd)
509 goto skip;
Haren Myneni9c15e852006-02-10 01:51:05 -0800510
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800511#ifdef CONFIG_KEXEC
Haren Myneni9c15e852006-02-10 01:51:05 -0800512 /*
513 * If the initrd region is overlapped with crashkernel reserved region,
514 * free only memory that is not part of crashkernel region.
515 */
516 if (initrd_start < crashk_end && initrd_end > crashk_start) {
517 /*
518 * Initialize initrd memory region since the kexec boot does
519 * not do.
520 */
521 memset((void *)initrd_start, 0, initrd_end - initrd_start);
522 if (initrd_start < crashk_start)
523 free_initrd_mem(initrd_start, crashk_start);
524 if (initrd_end > crashk_end)
525 free_initrd_mem(crashk_end, initrd_end);
526 } else
527#endif
528 free_initrd_mem(initrd_start, initrd_end);
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800529skip:
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700530 initrd_start = 0;
531 initrd_end = 0;
532}
533
Nikanth Karthikesanb52bb372009-04-13 14:39:38 -0700534#ifdef CONFIG_BLK_DEV_RAM
Li, Shaohuadf520922008-08-13 17:26:01 +0800535#define BUF_SIZE 1024
536static void __init clean_rootfs(void)
537{
538 int fd;
539 void *buf;
540 struct linux_dirent64 *dirp;
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800541 int num;
Li, Shaohuadf520922008-08-13 17:26:01 +0800542
H Hartley Sweetenc67e5382012-05-31 16:26:10 -0700543 fd = sys_open("/", O_RDONLY, 0);
Li, Shaohuadf520922008-08-13 17:26:01 +0800544 WARN_ON(fd < 0);
545 if (fd < 0)
546 return;
547 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
548 WARN_ON(!buf);
549 if (!buf) {
550 sys_close(fd);
551 return;
552 }
553
554 dirp = buf;
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800555 num = sys_getdents64(fd, dirp, BUF_SIZE);
556 while (num > 0) {
557 while (num > 0) {
Li, Shaohuadf520922008-08-13 17:26:01 +0800558 struct stat st;
559 int ret;
560
561 ret = sys_newlstat(dirp->d_name, &st);
562 WARN_ON_ONCE(ret);
563 if (!ret) {
564 if (S_ISDIR(st.st_mode))
565 sys_rmdir(dirp->d_name);
566 else
567 sys_unlink(dirp->d_name);
568 }
569
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800570 num -= dirp->d_reclen;
Li, Shaohuadf520922008-08-13 17:26:01 +0800571 dirp = (void *)dirp + dirp->d_reclen;
572 }
573 dirp = buf;
574 memset(buf, 0, BUF_SIZE);
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800575 num = sys_getdents64(fd, dirp, BUF_SIZE);
Li, Shaohuadf520922008-08-13 17:26:01 +0800576 }
577
578 sys_close(fd);
579 kfree(buf);
580}
Nikanth Karthikesanb52bb372009-04-13 14:39:38 -0700581#endif
Li, Shaohuadf520922008-08-13 17:26:01 +0800582
Linus Torvalds9a9e0d62008-03-15 11:53:32 -0700583static int __init populate_rootfs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
Hendrik Bruecknerffe80182010-09-17 15:24:11 -0700585 char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 if (err)
Tetsuo Handa499a4582014-01-23 15:54:56 -0800587 panic("%s", err); /* Failed to decompress INTERNAL initramfs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (initrd_start) {
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800589#ifdef CONFIG_BLK_DEV_RAM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 int fd;
Eric Piela1e6b6c2009-05-06 16:03:06 -0700591 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 err = unpack_to_rootfs((char *)initrd_start,
Li, Shaohuadf520922008-08-13 17:26:01 +0800593 initrd_end - initrd_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 if (!err) {
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700595 free_initrd();
Tejun Heobb813f42013-01-18 14:05:56 -0800596 goto done;
Li, Shaohuadf520922008-08-13 17:26:01 +0800597 } else {
598 clean_rootfs();
Hendrik Bruecknerffe80182010-09-17 15:24:11 -0700599 unpack_to_rootfs(__initramfs_start, __initramfs_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 }
Simon Kitchingc1c490e2009-04-02 16:57:00 -0700601 printk(KERN_INFO "rootfs image is not initramfs (%s)"
602 "; looks like an initrd\n", err);
H Hartley Sweetenc67e5382012-05-31 16:26:10 -0700603 fd = sys_open("/initrd.image",
Namhyung Kim562f5e62010-10-26 14:22:42 -0700604 O_WRONLY|O_CREAT, 0700);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (fd >= 0) {
606 sys_write(fd, (char *)initrd_start,
607 initrd_end - initrd_start);
608 sys_close(fd);
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700609 free_initrd();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
Tejun Heobb813f42013-01-18 14:05:56 -0800611 done:
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800612#else
Eric Piela1e6b6c2009-05-06 16:03:06 -0700613 printk(KERN_INFO "Unpacking initramfs...\n");
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800614 err = unpack_to_rootfs((char *)initrd_start,
Li, Shaohuadf520922008-08-13 17:26:01 +0800615 initrd_end - initrd_start);
Eric Piela1e6b6c2009-05-06 16:03:06 -0700616 if (err)
617 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800618 free_initrd();
619#endif
Tejun Heobb813f42013-01-18 14:05:56 -0800620 /*
621 * Try loading default modules from initramfs. This gives
622 * us a chance to load before device_initcalls.
623 */
624 load_default_modules();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 }
Linus Torvalds8d610dd2006-12-11 12:12:04 -0800626 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
Linus Torvalds8d610dd2006-12-11 12:12:04 -0800628rootfs_initcall(populate_rootfs);