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Merge tag 'sysctl-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl...
[thirdparty/linux.git] / init / initramfs.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4 2#include <linux/init.h>
e7cb072e 3#include <linux/async.h>
1da177e4
LT
4#include <linux/fs.h>
5#include <linux/slab.h>
6#include <linux/types.h>
7#include <linux/fcntl.h>
8#include <linux/delay.h>
9#include <linux/string.h>
df52092f 10#include <linux/dirent.h>
1da177e4 11#include <linux/syscalls.h>
889d51a1 12#include <linux/utime.h>
08865514 13#include <linux/file.h>
f3296f80 14#include <linux/kstrtox.h>
899ee4af 15#include <linux/memblock.h>
dd23e809 16#include <linux/mm.h>
b2a74d5f 17#include <linux/namei.h>
8fb9f73e 18#include <linux/init_syscalls.h>
b234ed6d 19#include <linux/umh.h>
1da177e4 20
386dc41c
CB
21#include "do_mounts.h"
22
800c24dc
DD
23static __initdata bool csum_present;
24static __initdata u32 io_csum;
25
26static ssize_t __init xwrite(struct file *file, const unsigned char *p,
27 size_t count, loff_t *pos)
38747439
YL
28{
29 ssize_t out = 0;
30
31 /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
32 while (count) {
bf6419e4 33 ssize_t rv = kernel_write(file, p, count, pos);
38747439
YL
34
35 if (rv < 0) {
36 if (rv == -EINTR || rv == -EAGAIN)
37 continue;
38 return out ? out : rv;
39 } else if (rv == 0)
40 break;
41
800c24dc
DD
42 if (csum_present) {
43 ssize_t i;
44
45 for (i = 0; i < rv; i++)
46 io_csum += p[i];
47 }
48
38747439
YL
49 p += rv;
50 out += rv;
51 count -= rv;
52 }
53
54 return out;
55}
56
1da177e4
LT
57static __initdata char *message;
58static void __init error(char *x)
59{
60 if (!message)
61 message = x;
62}
63
735faf92 64#define panic_show_mem(fmt, ...) \
527ed4f7 65 ({ show_mem(); panic(fmt, ##__VA_ARGS__); })
dd23e809 66
1da177e4
LT
67/* link hash */
68
6a050da4
MH
69#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
70
1da177e4
LT
71static __initdata struct hash {
72 int ino, minor, major;
685dd2d5 73 umode_t mode;
1da177e4 74 struct hash *next;
6a050da4 75 char name[N_ALIGN(PATH_MAX)];
1da177e4
LT
76} *head[32];
77
78static inline int hash(int major, int minor, int ino)
79{
80 unsigned long tmp = ino + minor + (major << 3);
81 tmp += tmp >> 5;
82 return tmp & 31;
83}
84
2139a7fb 85static char __init *find_link(int major, int minor, int ino,
685dd2d5 86 umode_t mode, char *name)
1da177e4
LT
87{
88 struct hash **p, *q;
89 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
90 if ((*p)->ino != ino)
91 continue;
92 if ((*p)->minor != minor)
93 continue;
94 if ((*p)->major != major)
95 continue;
2139a7fb
PA
96 if (((*p)->mode ^ mode) & S_IFMT)
97 continue;
1da177e4
LT
98 return (*p)->name;
99 }
3265e66b 100 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
1da177e4 101 if (!q)
dd23e809 102 panic_show_mem("can't allocate link hash entry");
1da177e4 103 q->major = major;
2139a7fb
PA
104 q->minor = minor;
105 q->ino = ino;
106 q->mode = mode;
6a050da4 107 strcpy(q->name, name);
1da177e4
LT
108 q->next = NULL;
109 *p = q;
110 return NULL;
111}
112
113static void __init free_hash(void)
114{
115 struct hash **p, *q;
116 for (p = head; p < head + 32; p++) {
117 while (*p) {
118 q = *p;
119 *p = q->next;
3265e66b 120 kfree(q);
1da177e4
LT
121 }
122 }
123}
124
1274aea1
DD
125#ifdef CONFIG_INITRAMFS_PRESERVE_MTIME
126static void __init do_utime(char *filename, time64_t mtime)
889d51a1 127{
1274aea1
DD
128 struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } };
129 init_utimes(filename, t);
130}
889d51a1 131
1274aea1
DD
132static void __init do_utime_path(const struct path *path, time64_t mtime)
133{
134 struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } };
135 vfs_utimes(path, t);
889d51a1
NL
136}
137
138static __initdata LIST_HEAD(dir_list);
139struct dir_entry {
140 struct list_head list;
e35c4c64 141 time64_t mtime;
fcb7aedd 142 char name[];
889d51a1
NL
143};
144
e35c4c64 145static void __init dir_add(const char *name, time64_t mtime)
889d51a1 146{
fcb7aedd
DD
147 size_t nlen = strlen(name) + 1;
148 struct dir_entry *de;
149
150 de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL);
889d51a1 151 if (!de)
dd23e809 152 panic_show_mem("can't allocate dir_entry buffer");
889d51a1 153 INIT_LIST_HEAD(&de->list);
fcb7aedd 154 strscpy(de->name, name, nlen);
889d51a1
NL
155 de->mtime = mtime;
156 list_add(&de->list, &dir_list);
157}
158
159static void __init dir_utime(void)
160{
161 struct dir_entry *de, *tmp;
162 list_for_each_entry_safe(de, tmp, &dir_list, list) {
163 list_del(&de->list);
164 do_utime(de->name, de->mtime);
889d51a1
NL
165 kfree(de);
166 }
167}
1274aea1
DD
168#else
169static void __init do_utime(char *filename, time64_t mtime) {}
170static void __init do_utime_path(const struct path *path, time64_t mtime) {}
171static void __init dir_add(const char *name, time64_t mtime) {}
172static void __init dir_utime(void) {}
173#endif
889d51a1 174
e35c4c64 175static __initdata time64_t mtime;
889d51a1 176
1da177e4
LT
177/* cpio header parsing */
178
179static __initdata unsigned long ino, major, minor, nlink;
685dd2d5 180static __initdata umode_t mode;
1da177e4
LT
181static __initdata unsigned long body_len, name_len;
182static __initdata uid_t uid;
183static __initdata gid_t gid;
184static __initdata unsigned rdev;
800c24dc 185static __initdata u32 hdr_csum;
1da177e4
LT
186
187static void __init parse_header(char *s)
188{
800c24dc 189 unsigned long parsed[13];
1da177e4
LT
190 char buf[9];
191 int i;
192
193 buf[8] = '\0';
800c24dc 194 for (i = 0, s += 6; i < 13; i++, s += 8) {
1da177e4
LT
195 memcpy(buf, s, 8);
196 parsed[i] = simple_strtoul(buf, NULL, 16);
197 }
198 ino = parsed[0];
199 mode = parsed[1];
200 uid = parsed[2];
201 gid = parsed[3];
202 nlink = parsed[4];
e35c4c64 203 mtime = parsed[5]; /* breaks in y2106 */
1da177e4
LT
204 body_len = parsed[6];
205 major = parsed[7];
206 minor = parsed[8];
207 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
208 name_len = parsed[11];
800c24dc 209 hdr_csum = parsed[12];
1da177e4
LT
210}
211
212/* FSM */
213
214static __initdata enum state {
215 Start,
216 Collect,
217 GotHeader,
218 SkipIt,
219 GotName,
220 CopyFile,
221 GotSymlink,
222 Reset
223} state, next_state;
224
225static __initdata char *victim;
c34d85ac 226static unsigned long byte_count __initdata;
1da177e4
LT
227static __initdata loff_t this_header, next_header;
228
b0a5ab93 229static inline void __init eat(unsigned n)
1da177e4
LT
230{
231 victim += n;
232 this_header += n;
c34d85ac 233 byte_count -= n;
1da177e4
LT
234}
235
1da177e4 236static __initdata char *collected;
d97b07c5 237static long remains __initdata;
1da177e4
LT
238static __initdata char *collect;
239
240static void __init read_into(char *buf, unsigned size, enum state next)
241{
c34d85ac 242 if (byte_count >= size) {
1da177e4
LT
243 collected = victim;
244 eat(size);
245 state = next;
246 } else {
247 collect = collected = buf;
248 remains = size;
249 next_state = next;
250 state = Collect;
251 }
252}
253
254static __initdata char *header_buf, *symlink_buf, *name_buf;
255
256static int __init do_start(void)
257{
258 read_into(header_buf, 110, GotHeader);
259 return 0;
260}
261
262static int __init do_collect(void)
263{
d97b07c5 264 unsigned long n = remains;
c34d85ac
MR
265 if (byte_count < n)
266 n = byte_count;
1da177e4
LT
267 memcpy(collect, victim, n);
268 eat(n);
269 collect += n;
270 if ((remains -= n) != 0)
271 return 1;
272 state = next_state;
273 return 0;
274}
275
276static int __init do_header(void)
277{
800c24dc
DD
278 if (!memcmp(collected, "070701", 6)) {
279 csum_present = false;
280 } else if (!memcmp(collected, "070702", 6)) {
281 csum_present = true;
282 } else {
da028e4c
DD
283 if (memcmp(collected, "070707", 6) == 0)
284 error("incorrect cpio method used: use -H newc option");
285 else
286 error("no cpio magic");
1da177e4
LT
287 return 1;
288 }
289 parse_header(collected);
290 next_header = this_header + N_ALIGN(name_len) + body_len;
291 next_header = (next_header + 3) & ~3;
1da177e4
LT
292 state = SkipIt;
293 if (name_len <= 0 || name_len > PATH_MAX)
294 return 0;
295 if (S_ISLNK(mode)) {
296 if (body_len > PATH_MAX)
297 return 0;
298 collect = collected = symlink_buf;
299 remains = N_ALIGN(name_len) + body_len;
300 next_state = GotSymlink;
301 state = Collect;
302 return 0;
303 }
304 if (S_ISREG(mode) || !body_len)
305 read_into(name_buf, N_ALIGN(name_len), GotName);
306 return 0;
307}
308
309static int __init do_skip(void)
310{
c34d85ac
MR
311 if (this_header + byte_count < next_header) {
312 eat(byte_count);
1da177e4
LT
313 return 1;
314 } else {
315 eat(next_header - this_header);
316 state = next_state;
317 return 0;
318 }
319}
320
321static int __init do_reset(void)
322{
c34d85ac 323 while (byte_count && *victim == '\0')
1da177e4 324 eat(1);
c34d85ac 325 if (byte_count && (this_header & 3))
1da177e4
LT
326 error("broken padding");
327 return 1;
328}
329
c34d85ac 330static void __init clean_path(char *path, umode_t fmode)
2139a7fb 331{
046aa126 332 struct kstat st;
2139a7fb 333
7b81ce7c 334 if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) &&
716308a5 335 (st.mode ^ fmode) & S_IFMT) {
046aa126 336 if (S_ISDIR(st.mode))
20cce026 337 init_rmdir(path);
2139a7fb 338 else
8fb9f73e 339 init_unlink(path);
2139a7fb
PA
340 }
341}
342
7c0950d4
LZ
343static int __init maybe_link(void)
344{
345 if (nlink >= 2) {
346 char *old = find_link(major, minor, ino, mode, collected);
347 if (old) {
348 clean_path(collected, 0);
812931d6 349 return (init_link(old, collected) < 0) ? -1 : 1;
7c0950d4
LZ
350 }
351 }
352 return 0;
353}
354
bf6419e4
CH
355static __initdata struct file *wfile;
356static __initdata loff_t wfile_pos;
1da177e4
LT
357
358static int __init do_name(void)
359{
360 state = SkipIt;
361 next_state = Reset;
362 if (strcmp(collected, "TRAILER!!!") == 0) {
363 free_hash();
364 return 0;
365 }
2139a7fb 366 clean_path(collected, mode);
1da177e4 367 if (S_ISREG(mode)) {
2139a7fb
PA
368 int ml = maybe_link();
369 if (ml >= 0) {
370 int openflags = O_WRONLY|O_CREAT;
371 if (ml != 1)
372 openflags |= O_TRUNC;
bf6419e4
CH
373 wfile = filp_open(collected, openflags, mode);
374 if (IS_ERR(wfile))
375 return 0;
376 wfile_pos = 0;
800c24dc 377 io_csum = 0;
bf6419e4
CH
378
379 vfs_fchown(wfile, uid, gid);
380 vfs_fchmod(wfile, mode);
381 if (body_len)
382 vfs_truncate(&wfile->f_path, body_len);
bf6419e4 383 state = CopyFile;
1da177e4
LT
384 }
385 } else if (S_ISDIR(mode)) {
83ff98c3 386 init_mkdir(collected, mode);
b873498f 387 init_chown(collected, uid, gid, 0);
1097742e 388 init_chmod(collected, mode);
889d51a1 389 dir_add(collected, mtime);
1da177e4
LT
390 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
391 S_ISFIFO(mode) || S_ISSOCK(mode)) {
392 if (maybe_link() == 0) {
5fee64fc 393 init_mknod(collected, mode, rdev);
b873498f 394 init_chown(collected, uid, gid, 0);
1097742e 395 init_chmod(collected, mode);
889d51a1 396 do_utime(collected, mtime);
1da177e4
LT
397 }
398 }
399 return 0;
400}
401
402static int __init do_copy(void)
403{
c34d85ac 404 if (byte_count >= body_len) {
bf6419e4 405 if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len)
9687fd91 406 error("write error");
38b08223 407
1274aea1 408 do_utime_path(&wfile->f_path, mtime);
bf6419e4 409 fput(wfile);
800c24dc
DD
410 if (csum_present && io_csum != hdr_csum)
411 error("bad data checksum");
1da177e4
LT
412 eat(body_len);
413 state = SkipIt;
414 return 0;
415 } else {
bf6419e4 416 if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count)
9687fd91 417 error("write error");
c34d85ac
MR
418 body_len -= byte_count;
419 eat(byte_count);
1da177e4
LT
420 return 1;
421 }
422}
423
424static int __init do_symlink(void)
425{
426 collected[N_ALIGN(name_len) + body_len] = '\0';
2139a7fb 427 clean_path(collected, 0);
cd3acb6a 428 init_symlink(collected + N_ALIGN(name_len), collected);
b873498f 429 init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW);
889d51a1 430 do_utime(collected, mtime);
1da177e4
LT
431 state = SkipIt;
432 next_state = Reset;
433 return 0;
434}
435
436static __initdata int (*actions[])(void) = {
437 [Start] = do_start,
438 [Collect] = do_collect,
439 [GotHeader] = do_header,
440 [SkipIt] = do_skip,
441 [GotName] = do_name,
442 [CopyFile] = do_copy,
443 [GotSymlink] = do_symlink,
444 [Reset] = do_reset,
445};
446
d97b07c5 447static long __init write_buffer(char *buf, unsigned long len)
1da177e4 448{
c34d85ac 449 byte_count = len;
1da177e4
LT
450 victim = buf;
451
452 while (!actions[state]())
453 ;
c34d85ac 454 return len - byte_count;
1da177e4
LT
455}
456
d97b07c5 457static long __init flush_buffer(void *bufv, unsigned long len)
1da177e4 458{
4197530b 459 char *buf = bufv;
d97b07c5
YL
460 long written;
461 long origLen = len;
1da177e4 462 if (message)
30d65dbf 463 return -1;
1da177e4
LT
464 while ((written = write_buffer(buf, len)) < len && !message) {
465 char c = buf[written];
466 if (c == '0') {
467 buf += written;
468 len -= written;
469 state = Start;
470 } else if (c == 0) {
471 buf += written;
472 len -= written;
473 state = Reset;
474 } else
e5eed351 475 error("junk within compressed archive");
1da177e4 476 }
30d65dbf 477 return origLen;
1da177e4
LT
478}
479
199cda13 480static unsigned long my_inptr __initdata; /* index of next byte to be processed in inbuf */
1da177e4 481
889c92d2 482#include <linux/decompress/generic.h>
1da177e4 483
d97b07c5 484static char * __init unpack_to_rootfs(char *buf, unsigned long len)
1da177e4 485{
d97b07c5 486 long written;
889c92d2 487 decompress_fn decompress;
23a22d57
PA
488 const char *compress_name;
489 static __initdata char msg_buf[64];
889c92d2 490
3265e66b
TP
491 header_buf = kmalloc(110, GFP_KERNEL);
492 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
493 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
30d65dbf
AK
494
495 if (!header_buf || !symlink_buf || !name_buf)
dd23e809 496 panic_show_mem("can't allocate buffers");
30d65dbf 497
1da177e4
LT
498 state = Start;
499 this_header = 0;
500 message = NULL;
501 while (!message && len) {
502 loff_t saved_offset = this_header;
503 if (*buf == '0' && !(this_header & 3)) {
504 state = Start;
505 written = write_buffer(buf, len);
506 buf += written;
507 len -= written;
508 continue;
509 }
510 if (!*buf) {
511 buf++;
512 len--;
513 this_header++;
514 continue;
515 }
516 this_header = 0;
23a22d57 517 decompress = decompress_method(buf, len, &compress_name);
6aa7a29a 518 pr_debug("Detected %s compressed data\n", compress_name);
54291362 519 if (decompress) {
d97b07c5 520 int res = decompress(buf, len, NULL, flush_buffer, NULL,
889c92d2 521 &my_inptr, error);
54291362
PL
522 if (res)
523 error("decompressor failed");
524 } else if (compress_name) {
23a22d57
PA
525 if (!message) {
526 snprintf(msg_buf, sizeof msg_buf,
527 "compression method %s not configured",
528 compress_name);
529 message = msg_buf;
530 }
df37bd15 531 } else
e5eed351 532 error("invalid magic at start of compressed archive");
1da177e4 533 if (state != Reset)
e5eed351 534 error("junk at the end of compressed archive");
30d65dbf
AK
535 this_header = saved_offset + my_inptr;
536 buf += my_inptr;
537 len -= my_inptr;
1da177e4 538 }
889d51a1 539 dir_utime();
3265e66b
TP
540 kfree(name_buf);
541 kfree(symlink_buf);
542 kfree(header_buf);
1da177e4
LT
543 return message;
544}
545
0a7b35cb
MN
546static int __initdata do_retain_initrd;
547
548static int __init retain_initrd_param(char *str)
549{
550 if (*str)
551 return 0;
552 do_retain_initrd = 1;
553 return 1;
554}
555__setup("retain_initrd", retain_initrd_param);
556
d8ae8a37
CH
557#ifdef CONFIG_ARCH_HAS_KEEPINITRD
558static int __init keepinitrd_setup(char *__unused)
559{
560 do_retain_initrd = 1;
561 return 1;
562}
563__setup("keepinitrd", keepinitrd_setup);
564#endif
565
e7cb072e
RV
566static bool __initdata initramfs_async = true;
567static int __init initramfs_async_setup(char *str)
568{
f3296f80 569 return kstrtobool(str, &initramfs_async) == 0;
e7cb072e
RV
570}
571__setup("initramfs_async=", initramfs_async_setup);
572
ffe8018c
HB
573extern char __initramfs_start[];
574extern unsigned long __initramfs_size;
1da177e4 575#include <linux/initrd.h>
9c15e852 576#include <linux/kexec.h>
0f3d2bd5 577
2678fd2f
AG
578static ssize_t raw_read(struct file *file, struct kobject *kobj,
579 struct bin_attribute *attr, char *buf,
580 loff_t pos, size_t count)
581{
582 memcpy(buf, attr->private + pos, count);
583 return count;
584}
585
586static BIN_ATTR(initrd, 0440, raw_read, NULL, 0);
587
c72160fe
KW
588void __init reserve_initrd_mem(void)
589{
590 phys_addr_t start;
591 unsigned long size;
592
593 /* Ignore the virtul address computed during device tree parsing */
594 initrd_start = initrd_end = 0;
595
596 if (!phys_initrd_size)
597 return;
598 /*
599 * Round the memory region to page boundaries as per free_initrd_mem()
600 * This allows us to detect whether the pages overlapping the initrd
601 * are in use, but more importantly, reserves the entire set of pages
602 * as we don't want these pages allocated for other purposes.
603 */
604 start = round_down(phys_initrd_start, PAGE_SIZE);
605 size = phys_initrd_size + (phys_initrd_start - start);
606 size = round_up(size, PAGE_SIZE);
607
608 if (!memblock_is_region_memory(start, size)) {
609 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
610 (u64)start, size);
611 goto disable;
612 }
613
614 if (memblock_is_region_reserved(start, size)) {
615 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
616 (u64)start, size);
617 goto disable;
618 }
619
620 memblock_reserve(start, size);
621 /* Now convert initrd to virtual addresses */
622 initrd_start = (unsigned long)__va(phys_initrd_start);
623 initrd_end = initrd_start + phys_initrd_size;
624 initrd_below_start_ok = 1;
625
626 return;
627disable:
628 pr_cont(" - disabling initrd\n");
629 initrd_start = 0;
630 initrd_end = 0;
631}
632
55d5b7dd 633void __weak __init free_initrd_mem(unsigned long start, unsigned long end)
4afd58e1 634{
899ee4af
MR
635#ifdef CONFIG_ARCH_KEEP_MEMBLOCK
636 unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE);
637 unsigned long aligned_end = ALIGN(end, PAGE_SIZE);
638
4421cca0 639 memblock_free((void *)aligned_start, aligned_end - aligned_start);
899ee4af
MR
640#endif
641
f94f7434
CH
642 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
643 "initrd");
4afd58e1
CH
644}
645
02aff848 646#ifdef CONFIG_CRASH_RESERVE
e99332e7 647static bool __init kexec_free_initrd(void)
23091e28 648{
9c15e852
HM
649 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
650 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
651
652 /*
653 * If the initrd region is overlapped with crashkernel reserved region,
654 * free only memory that is not part of crashkernel region.
655 */
23091e28
CH
656 if (initrd_start >= crashk_end || initrd_end <= crashk_start)
657 return false;
658
659 /*
660 * Initialize initrd memory region since the kexec boot does not do.
661 */
662 memset((void *)initrd_start, 0, initrd_end - initrd_start);
663 if (initrd_start < crashk_start)
664 free_initrd_mem(initrd_start, crashk_start);
665 if (initrd_end > crashk_end)
666 free_initrd_mem(crashk_end, initrd_end);
667 return true;
0f3d2bd5 668}
23091e28
CH
669#else
670static inline bool kexec_free_initrd(void)
671{
672 return false;
673}
674#endif /* CONFIG_KEXEC_CORE */
0f3d2bd5 675
a841c673 676#ifdef CONFIG_BLK_DEV_RAM
4ada1e81 677static void __init populate_initrd_image(char *err)
7c184ecd
CH
678{
679 ssize_t written;
bf6419e4
CH
680 struct file *file;
681 loff_t pos = 0;
7c184ecd 682
7c184ecd
CH
683 printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n",
684 err);
bf6419e4
CH
685 file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700);
686 if (IS_ERR(file))
7c184ecd
CH
687 return;
688
bf6419e4
CH
689 written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start,
690 &pos);
7c184ecd
CH
691 if (written != initrd_end - initrd_start)
692 pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
693 written, initrd_end - initrd_start);
bf6419e4 694 fput(file);
7c184ecd
CH
695}
696#endif /* CONFIG_BLK_DEV_RAM */
697
e7cb072e 698static void __init do_populate_rootfs(void *unused, async_cookie_t cookie)
1da177e4 699{
17a9be31 700 /* Load the built in initramfs */
ffe8018c 701 char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
1da177e4 702 if (err)
dd23e809 703 panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */
afef7889
CH
704
705 if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE))
706 goto done;
707
708 if (IS_ENABLED(CONFIG_BLK_DEV_RAM))
a1e6b6c1 709 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
afef7889
CH
710 else
711 printk(KERN_INFO "Unpacking initramfs...\n");
54c7a891 712
afef7889
CH
713 err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
714 if (err) {
9ab6b718 715#ifdef CONFIG_BLK_DEV_RAM
7c184ecd 716 populate_initrd_image(err);
9ab6b718
CH
717#else
718 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
719#endif
1da177e4 720 }
23091e28 721
afef7889 722done:
23091e28
CH
723 /*
724 * If the initrd region is overlapped with crashkernel reserved region,
725 * free only memory that is not part of crashkernel region.
726 */
2678fd2f 727 if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) {
23091e28 728 free_initrd_mem(initrd_start, initrd_end);
2678fd2f
AG
729 } else if (do_retain_initrd && initrd_start) {
730 bin_attr_initrd.size = initrd_end - initrd_start;
731 bin_attr_initrd.private = (void *)initrd_start;
732 if (sysfs_create_bin_file(firmware_kobj, &bin_attr_initrd))
733 pr_err("Failed to create initrd sysfs file");
734 }
23091e28
CH
735 initrd_start = 0;
736 initrd_end = 0;
737
386dc41c 738 init_flush_fput();
e7cb072e
RV
739}
740
741static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain);
742static async_cookie_t initramfs_cookie;
743
744void wait_for_initramfs(void)
745{
746 if (!initramfs_cookie) {
747 /*
748 * Something before rootfs_initcall wants to access
749 * the filesystem/initramfs. Probably a bug. Make a
750 * note, avoid deadlocking the machine, and let the
751 * caller's access fail as it used to.
752 */
753 pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n");
754 return;
755 }
756 async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain);
757}
758EXPORT_SYMBOL_GPL(wait_for_initramfs);
759
760static int __init populate_rootfs(void)
761{
762 initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL,
763 &initramfs_domain);
b234ed6d 764 usermodehelper_enable();
e7cb072e
RV
765 if (!initramfs_async)
766 wait_for_initramfs();
8d610dd5 767 return 0;
1da177e4 768}
8d610dd5 769rootfs_initcall(populate_rootfs);