blob: 37d3859b1b32eda85e12ef7c0f1a159b32eafe4c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Li, Shaohuadf520922008-08-13 17:26:01 +08008#include <linux/dirent.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/syscalls.h>
Nye Liu889d51a2008-10-15 22:01:40 -070010#include <linux/utime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12static __initdata char *message;
13static void __init error(char *x)
14{
15 if (!message)
16 message = x;
17}
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019/* link hash */
20
Mark Huang6a050da2006-05-15 09:44:03 -070021#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023static __initdata struct hash {
24 int ino, minor, major;
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070025 mode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 struct hash *next;
Mark Huang6a050da2006-05-15 09:44:03 -070027 char name[N_ALIGN(PATH_MAX)];
Linus Torvalds1da177e2005-04-16 15:20:36 -070028} *head[32];
29
30static inline int hash(int major, int minor, int ino)
31{
32 unsigned long tmp = ino + minor + (major << 3);
33 tmp += tmp >> 5;
34 return tmp & 31;
35}
36
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070037static char __init *find_link(int major, int minor, int ino,
38 mode_t mode, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
40 struct hash **p, *q;
41 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
42 if ((*p)->ino != ino)
43 continue;
44 if ((*p)->minor != minor)
45 continue;
46 if ((*p)->major != major)
47 continue;
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070048 if (((*p)->mode ^ mode) & S_IFMT)
49 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 return (*p)->name;
51 }
Thomas Petazzoni3265e662008-04-29 00:59:43 -070052 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 if (!q)
54 panic("can't allocate link hash entry");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 q->major = major;
H. Peter Anvin2139a7f2006-06-26 00:28:02 -070056 q->minor = minor;
57 q->ino = ino;
58 q->mode = mode;
Mark Huang6a050da2006-05-15 09:44:03 -070059 strcpy(q->name, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 q->next = NULL;
61 *p = q;
62 return NULL;
63}
64
65static void __init free_hash(void)
66{
67 struct hash **p, *q;
68 for (p = head; p < head + 32; p++) {
69 while (*p) {
70 q = *p;
71 *p = q->next;
Thomas Petazzoni3265e662008-04-29 00:59:43 -070072 kfree(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 }
74 }
75}
76
Nye Liu889d51a2008-10-15 22:01:40 -070077static long __init do_utime(char __user *filename, time_t mtime)
78{
79 struct timespec t[2];
80
81 t[0].tv_sec = mtime;
82 t[0].tv_nsec = 0;
83 t[1].tv_sec = mtime;
84 t[1].tv_nsec = 0;
85
86 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
87}
88
89static __initdata LIST_HEAD(dir_list);
90struct dir_entry {
91 struct list_head list;
92 char *name;
93 time_t mtime;
94};
95
96static void __init dir_add(const char *name, time_t mtime)
97{
98 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
99 if (!de)
100 panic("can't allocate dir_entry buffer");
101 INIT_LIST_HEAD(&de->list);
102 de->name = kstrdup(name, GFP_KERNEL);
103 de->mtime = mtime;
104 list_add(&de->list, &dir_list);
105}
106
107static void __init dir_utime(void)
108{
109 struct dir_entry *de, *tmp;
110 list_for_each_entry_safe(de, tmp, &dir_list, list) {
111 list_del(&de->list);
112 do_utime(de->name, de->mtime);
113 kfree(de->name);
114 kfree(de);
115 }
116}
117
118static __initdata time_t mtime;
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120/* cpio header parsing */
121
122static __initdata unsigned long ino, major, minor, nlink;
123static __initdata mode_t mode;
124static __initdata unsigned long body_len, name_len;
125static __initdata uid_t uid;
126static __initdata gid_t gid;
127static __initdata unsigned rdev;
128
129static void __init parse_header(char *s)
130{
131 unsigned long parsed[12];
132 char buf[9];
133 int i;
134
135 buf[8] = '\0';
136 for (i = 0, s += 6; i < 12; i++, s += 8) {
137 memcpy(buf, s, 8);
138 parsed[i] = simple_strtoul(buf, NULL, 16);
139 }
140 ino = parsed[0];
141 mode = parsed[1];
142 uid = parsed[2];
143 gid = parsed[3];
144 nlink = parsed[4];
Nye Liu889d51a2008-10-15 22:01:40 -0700145 mtime = parsed[5];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 body_len = parsed[6];
147 major = parsed[7];
148 minor = parsed[8];
149 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
150 name_len = parsed[11];
151}
152
153/* FSM */
154
155static __initdata enum state {
156 Start,
157 Collect,
158 GotHeader,
159 SkipIt,
160 GotName,
161 CopyFile,
162 GotSymlink,
163 Reset
164} state, next_state;
165
166static __initdata char *victim;
167static __initdata unsigned count;
168static __initdata loff_t this_header, next_header;
169
Al Virob0a5ab92007-07-26 17:33:59 +0100170static inline void __init eat(unsigned n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
172 victim += n;
173 this_header += n;
174 count -= n;
175}
176
Nye Liu889d51a2008-10-15 22:01:40 -0700177static __initdata char *vcollected;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178static __initdata char *collected;
179static __initdata int remains;
180static __initdata char *collect;
181
182static void __init read_into(char *buf, unsigned size, enum state next)
183{
184 if (count >= size) {
185 collected = victim;
186 eat(size);
187 state = next;
188 } else {
189 collect = collected = buf;
190 remains = size;
191 next_state = next;
192 state = Collect;
193 }
194}
195
196static __initdata char *header_buf, *symlink_buf, *name_buf;
197
198static int __init do_start(void)
199{
200 read_into(header_buf, 110, GotHeader);
201 return 0;
202}
203
204static int __init do_collect(void)
205{
206 unsigned n = remains;
207 if (count < n)
208 n = count;
209 memcpy(collect, victim, n);
210 eat(n);
211 collect += n;
212 if ((remains -= n) != 0)
213 return 1;
214 state = next_state;
215 return 0;
216}
217
218static int __init do_header(void)
219{
Arjan van de Ven2e591bb2006-12-06 20:37:19 -0800220 if (memcmp(collected, "070707", 6)==0) {
221 error("incorrect cpio method used: use -H newc option");
222 return 1;
223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 if (memcmp(collected, "070701", 6)) {
225 error("no cpio magic");
226 return 1;
227 }
228 parse_header(collected);
229 next_header = this_header + N_ALIGN(name_len) + body_len;
230 next_header = (next_header + 3) & ~3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 state = SkipIt;
232 if (name_len <= 0 || name_len > PATH_MAX)
233 return 0;
234 if (S_ISLNK(mode)) {
235 if (body_len > PATH_MAX)
236 return 0;
237 collect = collected = symlink_buf;
238 remains = N_ALIGN(name_len) + body_len;
239 next_state = GotSymlink;
240 state = Collect;
241 return 0;
242 }
243 if (S_ISREG(mode) || !body_len)
244 read_into(name_buf, N_ALIGN(name_len), GotName);
245 return 0;
246}
247
248static int __init do_skip(void)
249{
250 if (this_header + count < next_header) {
251 eat(count);
252 return 1;
253 } else {
254 eat(next_header - this_header);
255 state = next_state;
256 return 0;
257 }
258}
259
260static int __init do_reset(void)
261{
262 while(count && *victim == '\0')
263 eat(1);
264 if (count && (this_header & 3))
265 error("broken padding");
266 return 1;
267}
268
269static int __init maybe_link(void)
270{
271 if (nlink >= 2) {
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700272 char *old = find_link(major, minor, ino, mode, collected);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 if (old)
274 return (sys_link(old, collected) < 0) ? -1 : 1;
275 }
276 return 0;
277}
278
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700279static void __init clean_path(char *path, mode_t mode)
280{
281 struct stat st;
282
283 if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
284 if (S_ISDIR(st.st_mode))
285 sys_rmdir(path);
286 else
287 sys_unlink(path);
288 }
289}
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291static __initdata int wfd;
292
293static int __init do_name(void)
294{
295 state = SkipIt;
296 next_state = Reset;
297 if (strcmp(collected, "TRAILER!!!") == 0) {
298 free_hash();
299 return 0;
300 }
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700301 clean_path(collected, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 if (S_ISREG(mode)) {
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700303 int ml = maybe_link();
304 if (ml >= 0) {
305 int openflags = O_WRONLY|O_CREAT;
306 if (ml != 1)
307 openflags |= O_TRUNC;
308 wfd = sys_open(collected, openflags, mode);
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 if (wfd >= 0) {
311 sys_fchown(wfd, uid, gid);
312 sys_fchmod(wfd, mode);
Randy Robertsond20d5a72009-04-13 14:40:04 -0700313 if (body_len)
314 sys_ftruncate(wfd, body_len);
Nye Liu889d51a2008-10-15 22:01:40 -0700315 vcollected = kstrdup(collected, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 state = CopyFile;
317 }
318 }
319 } else if (S_ISDIR(mode)) {
320 sys_mkdir(collected, mode);
321 sys_chown(collected, uid, gid);
322 sys_chmod(collected, mode);
Nye Liu889d51a2008-10-15 22:01:40 -0700323 dir_add(collected, mtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
325 S_ISFIFO(mode) || S_ISSOCK(mode)) {
326 if (maybe_link() == 0) {
327 sys_mknod(collected, mode, rdev);
328 sys_chown(collected, uid, gid);
329 sys_chmod(collected, mode);
Nye Liu889d51a2008-10-15 22:01:40 -0700330 do_utime(collected, mtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
332 }
333 return 0;
334}
335
336static int __init do_copy(void)
337{
338 if (count >= body_len) {
339 sys_write(wfd, victim, body_len);
340 sys_close(wfd);
Nye Liu889d51a2008-10-15 22:01:40 -0700341 do_utime(vcollected, mtime);
342 kfree(vcollected);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 eat(body_len);
344 state = SkipIt;
345 return 0;
346 } else {
347 sys_write(wfd, victim, count);
348 body_len -= count;
349 eat(count);
350 return 1;
351 }
352}
353
354static int __init do_symlink(void)
355{
356 collected[N_ALIGN(name_len) + body_len] = '\0';
H. Peter Anvin2139a7f2006-06-26 00:28:02 -0700357 clean_path(collected, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 sys_symlink(collected + N_ALIGN(name_len), collected);
359 sys_lchown(collected, uid, gid);
Nye Liu889d51a2008-10-15 22:01:40 -0700360 do_utime(collected, mtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 state = SkipIt;
362 next_state = Reset;
363 return 0;
364}
365
366static __initdata int (*actions[])(void) = {
367 [Start] = do_start,
368 [Collect] = do_collect,
369 [GotHeader] = do_header,
370 [SkipIt] = do_skip,
371 [GotName] = do_name,
372 [CopyFile] = do_copy,
373 [GotSymlink] = do_symlink,
374 [Reset] = do_reset,
375};
376
377static int __init write_buffer(char *buf, unsigned len)
378{
379 count = len;
380 victim = buf;
381
382 while (!actions[state]())
383 ;
384 return len - count;
385}
386
Alain Knaff30d65db2009-01-04 22:46:17 +0100387static int __init flush_buffer(void *bufv, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
Alain Knaff30d65db2009-01-04 22:46:17 +0100389 char *buf = (char *) bufv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 int written;
Alain Knaff30d65db2009-01-04 22:46:17 +0100391 int origLen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 if (message)
Alain Knaff30d65db2009-01-04 22:46:17 +0100393 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 while ((written = write_buffer(buf, len)) < len && !message) {
395 char c = buf[written];
396 if (c == '0') {
397 buf += written;
398 len -= written;
399 state = Start;
400 } else if (c == 0) {
401 buf += written;
402 len -= written;
403 state = Reset;
404 } else
405 error("junk in compressed archive");
406 }
Alain Knaff30d65db2009-01-04 22:46:17 +0100407 return origLen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
Alain Knaff30d65db2009-01-04 22:46:17 +0100410static unsigned my_inptr; /* index of next byte to be processed in inbuf */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800412#include <linux/decompress/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Li, Shaohuadf520922008-08-13 17:26:01 +0800414static char * __init unpack_to_rootfs(char *buf, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Phillip Lougher54291362009-12-14 21:45:19 +0000416 int written, res;
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800417 decompress_fn decompress;
H. Peter Anvin23a22d52009-01-12 14:24:04 -0800418 const char *compress_name;
419 static __initdata char msg_buf[64];
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800420
Thomas Petazzoni3265e662008-04-29 00:59:43 -0700421 header_buf = kmalloc(110, GFP_KERNEL);
422 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
423 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
Alain Knaff30d65db2009-01-04 22:46:17 +0100424
425 if (!header_buf || !symlink_buf || !name_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 panic("can't allocate buffers");
Alain Knaff30d65db2009-01-04 22:46:17 +0100427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 state = Start;
429 this_header = 0;
430 message = NULL;
431 while (!message && len) {
432 loff_t saved_offset = this_header;
433 if (*buf == '0' && !(this_header & 3)) {
434 state = Start;
435 written = write_buffer(buf, len);
436 buf += written;
437 len -= written;
438 continue;
439 }
440 if (!*buf) {
441 buf++;
442 len--;
443 this_header++;
444 continue;
445 }
446 this_header = 0;
H. Peter Anvin23a22d52009-01-12 14:24:04 -0800447 decompress = decompress_method(buf, len, &compress_name);
Phillip Lougher54291362009-12-14 21:45:19 +0000448 if (decompress) {
449 res = decompress(buf, len, NULL, flush_buffer, NULL,
H. Peter Anvin889c92d2009-01-08 15:14:17 -0800450 &my_inptr, error);
Phillip Lougher54291362009-12-14 21:45:19 +0000451 if (res)
452 error("decompressor failed");
453 } else if (compress_name) {
H. Peter Anvin23a22d52009-01-12 14:24:04 -0800454 if (!message) {
455 snprintf(msg_buf, sizeof msg_buf,
456 "compression method %s not configured",
457 compress_name);
458 message = msg_buf;
459 }
460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 if (state != Reset)
Alain Knaff30d65db2009-01-04 22:46:17 +0100462 error("junk in compressed archive");
463 this_header = saved_offset + my_inptr;
464 buf += my_inptr;
465 len -= my_inptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
Nye Liu889d51a2008-10-15 22:01:40 -0700467 dir_utime();
Thomas Petazzoni3265e662008-04-29 00:59:43 -0700468 kfree(name_buf);
469 kfree(symlink_buf);
470 kfree(header_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 return message;
472}
473
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800474static int __initdata do_retain_initrd;
475
476static int __init retain_initrd_param(char *str)
477{
478 if (*str)
479 return 0;
480 do_retain_initrd = 1;
481 return 1;
482}
483__setup("retain_initrd", retain_initrd_param);
484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485extern char __initramfs_start[], __initramfs_end[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486#include <linux/initrd.h>
Haren Myneni9c15e852006-02-10 01:51:05 -0800487#include <linux/kexec.h>
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700488
489static void __init free_initrd(void)
490{
Haren Myneni9c15e852006-02-10 01:51:05 -0800491#ifdef CONFIG_KEXEC
492 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
493 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800494#endif
495 if (do_retain_initrd)
496 goto skip;
Haren Myneni9c15e852006-02-10 01:51:05 -0800497
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800498#ifdef CONFIG_KEXEC
Haren Myneni9c15e852006-02-10 01:51:05 -0800499 /*
500 * If the initrd region is overlapped with crashkernel reserved region,
501 * free only memory that is not part of crashkernel region.
502 */
503 if (initrd_start < crashk_end && initrd_end > crashk_start) {
504 /*
505 * Initialize initrd memory region since the kexec boot does
506 * not do.
507 */
508 memset((void *)initrd_start, 0, initrd_end - initrd_start);
509 if (initrd_start < crashk_start)
510 free_initrd_mem(initrd_start, crashk_start);
511 if (initrd_end > crashk_end)
512 free_initrd_mem(crashk_end, initrd_end);
513 } else
514#endif
515 free_initrd_mem(initrd_start, initrd_end);
Michael Neuling0a7b35cb2007-02-10 01:44:33 -0800516skip:
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700517 initrd_start = 0;
518 initrd_end = 0;
519}
520
Nikanth Karthikesanb52bb372009-04-13 14:39:38 -0700521#ifdef CONFIG_BLK_DEV_RAM
Li, Shaohuadf520922008-08-13 17:26:01 +0800522#define BUF_SIZE 1024
523static void __init clean_rootfs(void)
524{
525 int fd;
526 void *buf;
527 struct linux_dirent64 *dirp;
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800528 int num;
Li, Shaohuadf520922008-08-13 17:26:01 +0800529
530 fd = sys_open("/", O_RDONLY, 0);
531 WARN_ON(fd < 0);
532 if (fd < 0)
533 return;
534 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
535 WARN_ON(!buf);
536 if (!buf) {
537 sys_close(fd);
538 return;
539 }
540
541 dirp = buf;
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800542 num = sys_getdents64(fd, dirp, BUF_SIZE);
543 while (num > 0) {
544 while (num > 0) {
Li, Shaohuadf520922008-08-13 17:26:01 +0800545 struct stat st;
546 int ret;
547
548 ret = sys_newlstat(dirp->d_name, &st);
549 WARN_ON_ONCE(ret);
550 if (!ret) {
551 if (S_ISDIR(st.st_mode))
552 sys_rmdir(dirp->d_name);
553 else
554 sys_unlink(dirp->d_name);
555 }
556
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800557 num -= dirp->d_reclen;
Li, Shaohuadf520922008-08-13 17:26:01 +0800558 dirp = (void *)dirp + dirp->d_reclen;
559 }
560 dirp = buf;
561 memset(buf, 0, BUF_SIZE);
H Hartley Sweeten8aaed5b2010-03-05 13:42:39 -0800562 num = sys_getdents64(fd, dirp, BUF_SIZE);
Li, Shaohuadf520922008-08-13 17:26:01 +0800563 }
564
565 sys_close(fd);
566 kfree(buf);
567}
Nikanth Karthikesanb52bb372009-04-13 14:39:38 -0700568#endif
Li, Shaohuadf520922008-08-13 17:26:01 +0800569
Linus Torvalds9a9e0d62008-03-15 11:53:32 -0700570static int __init populate_rootfs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
572 char *err = unpack_to_rootfs(__initramfs_start,
Li, Shaohuadf520922008-08-13 17:26:01 +0800573 __initramfs_end - __initramfs_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 if (err)
H. Peter Anvin73310a12009-01-14 11:28:35 -0800575 panic(err); /* Failed to decompress INTERNAL initramfs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (initrd_start) {
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800577#ifdef CONFIG_BLK_DEV_RAM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 int fd;
Eric Piela1e6b6c2009-05-06 16:03:06 -0700579 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 err = unpack_to_rootfs((char *)initrd_start,
Li, Shaohuadf520922008-08-13 17:26:01 +0800581 initrd_end - initrd_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 if (!err) {
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700583 free_initrd();
Linus Torvalds8d610dd2006-12-11 12:12:04 -0800584 return 0;
Li, Shaohuadf520922008-08-13 17:26:01 +0800585 } else {
586 clean_rootfs();
587 unpack_to_rootfs(__initramfs_start,
588 __initramfs_end - __initramfs_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 }
Simon Kitchingc1c490e2009-04-02 16:57:00 -0700590 printk(KERN_INFO "rootfs image is not initramfs (%s)"
591 "; looks like an initrd\n", err);
Jason Gunthorpe33644c52006-03-26 01:37:38 -0800592 fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 if (fd >= 0) {
594 sys_write(fd, (char *)initrd_start,
595 initrd_end - initrd_start);
596 sys_close(fd);
Jan Beulich0f3d2bd2005-09-13 01:25:12 -0700597 free_initrd();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 }
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800599#else
Eric Piela1e6b6c2009-05-06 16:03:06 -0700600 printk(KERN_INFO "Unpacking initramfs...\n");
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800601 err = unpack_to_rootfs((char *)initrd_start,
Li, Shaohuadf520922008-08-13 17:26:01 +0800602 initrd_end - initrd_start);
Eric Piela1e6b6c2009-05-06 16:03:06 -0700603 if (err)
604 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
Zdenek Pavlas340e48e2006-03-25 03:07:49 -0800605 free_initrd();
606#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 }
Linus Torvalds8d610dd2006-12-11 12:12:04 -0800608 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609}
Linus Torvalds8d610dd2006-12-11 12:12:04 -0800610rootfs_initcall(populate_rootfs);