Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #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> |
| 8 | #include <linux/syscalls.h> |
| 9 | |
| 10 | static __initdata char *message; |
| 11 | static void __init error(char *x) |
| 12 | { |
| 13 | if (!message) |
| 14 | message = x; |
| 15 | } |
| 16 | |
| 17 | static void __init *malloc(size_t size) |
| 18 | { |
| 19 | return kmalloc(size, GFP_KERNEL); |
| 20 | } |
| 21 | |
| 22 | static void __init free(void *where) |
| 23 | { |
| 24 | kfree(where); |
| 25 | } |
| 26 | |
| 27 | /* link hash */ |
| 28 | |
| 29 | static __initdata struct hash { |
| 30 | int ino, minor, major; |
| 31 | struct hash *next; |
| 32 | char *name; |
| 33 | } *head[32]; |
| 34 | |
| 35 | static inline int hash(int major, int minor, int ino) |
| 36 | { |
| 37 | unsigned long tmp = ino + minor + (major << 3); |
| 38 | tmp += tmp >> 5; |
| 39 | return tmp & 31; |
| 40 | } |
| 41 | |
| 42 | static char __init *find_link(int major, int minor, int ino, char *name) |
| 43 | { |
| 44 | struct hash **p, *q; |
| 45 | for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { |
| 46 | if ((*p)->ino != ino) |
| 47 | continue; |
| 48 | if ((*p)->minor != minor) |
| 49 | continue; |
| 50 | if ((*p)->major != major) |
| 51 | continue; |
| 52 | return (*p)->name; |
| 53 | } |
| 54 | q = (struct hash *)malloc(sizeof(struct hash)); |
| 55 | if (!q) |
| 56 | panic("can't allocate link hash entry"); |
| 57 | q->ino = ino; |
| 58 | q->minor = minor; |
| 59 | q->major = major; |
| 60 | q->name = name; |
| 61 | q->next = NULL; |
| 62 | *p = q; |
| 63 | return NULL; |
| 64 | } |
| 65 | |
| 66 | static void __init free_hash(void) |
| 67 | { |
| 68 | struct hash **p, *q; |
| 69 | for (p = head; p < head + 32; p++) { |
| 70 | while (*p) { |
| 71 | q = *p; |
| 72 | *p = q->next; |
| 73 | free(q); |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /* cpio header parsing */ |
| 79 | |
| 80 | static __initdata unsigned long ino, major, minor, nlink; |
| 81 | static __initdata mode_t mode; |
| 82 | static __initdata unsigned long body_len, name_len; |
| 83 | static __initdata uid_t uid; |
| 84 | static __initdata gid_t gid; |
| 85 | static __initdata unsigned rdev; |
| 86 | |
| 87 | static void __init parse_header(char *s) |
| 88 | { |
| 89 | unsigned long parsed[12]; |
| 90 | char buf[9]; |
| 91 | int i; |
| 92 | |
| 93 | buf[8] = '\0'; |
| 94 | for (i = 0, s += 6; i < 12; i++, s += 8) { |
| 95 | memcpy(buf, s, 8); |
| 96 | parsed[i] = simple_strtoul(buf, NULL, 16); |
| 97 | } |
| 98 | ino = parsed[0]; |
| 99 | mode = parsed[1]; |
| 100 | uid = parsed[2]; |
| 101 | gid = parsed[3]; |
| 102 | nlink = parsed[4]; |
| 103 | body_len = parsed[6]; |
| 104 | major = parsed[7]; |
| 105 | minor = parsed[8]; |
| 106 | rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); |
| 107 | name_len = parsed[11]; |
| 108 | } |
| 109 | |
| 110 | /* FSM */ |
| 111 | |
| 112 | static __initdata enum state { |
| 113 | Start, |
| 114 | Collect, |
| 115 | GotHeader, |
| 116 | SkipIt, |
| 117 | GotName, |
| 118 | CopyFile, |
| 119 | GotSymlink, |
| 120 | Reset |
| 121 | } state, next_state; |
| 122 | |
| 123 | static __initdata char *victim; |
| 124 | static __initdata unsigned count; |
| 125 | static __initdata loff_t this_header, next_header; |
| 126 | |
| 127 | static __initdata int dry_run; |
| 128 | |
| 129 | static inline void eat(unsigned n) |
| 130 | { |
| 131 | victim += n; |
| 132 | this_header += n; |
| 133 | count -= n; |
| 134 | } |
| 135 | |
| 136 | #define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
| 137 | |
| 138 | static __initdata char *collected; |
| 139 | static __initdata int remains; |
| 140 | static __initdata char *collect; |
| 141 | |
| 142 | static void __init read_into(char *buf, unsigned size, enum state next) |
| 143 | { |
| 144 | if (count >= size) { |
| 145 | collected = victim; |
| 146 | eat(size); |
| 147 | state = next; |
| 148 | } else { |
| 149 | collect = collected = buf; |
| 150 | remains = size; |
| 151 | next_state = next; |
| 152 | state = Collect; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | static __initdata char *header_buf, *symlink_buf, *name_buf; |
| 157 | |
| 158 | static int __init do_start(void) |
| 159 | { |
| 160 | read_into(header_buf, 110, GotHeader); |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int __init do_collect(void) |
| 165 | { |
| 166 | unsigned n = remains; |
| 167 | if (count < n) |
| 168 | n = count; |
| 169 | memcpy(collect, victim, n); |
| 170 | eat(n); |
| 171 | collect += n; |
| 172 | if ((remains -= n) != 0) |
| 173 | return 1; |
| 174 | state = next_state; |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int __init do_header(void) |
| 179 | { |
| 180 | if (memcmp(collected, "070701", 6)) { |
| 181 | error("no cpio magic"); |
| 182 | return 1; |
| 183 | } |
| 184 | parse_header(collected); |
| 185 | next_header = this_header + N_ALIGN(name_len) + body_len; |
| 186 | next_header = (next_header + 3) & ~3; |
| 187 | if (dry_run) { |
| 188 | read_into(name_buf, N_ALIGN(name_len), GotName); |
| 189 | return 0; |
| 190 | } |
| 191 | state = SkipIt; |
| 192 | if (name_len <= 0 || name_len > PATH_MAX) |
| 193 | return 0; |
| 194 | if (S_ISLNK(mode)) { |
| 195 | if (body_len > PATH_MAX) |
| 196 | return 0; |
| 197 | collect = collected = symlink_buf; |
| 198 | remains = N_ALIGN(name_len) + body_len; |
| 199 | next_state = GotSymlink; |
| 200 | state = Collect; |
| 201 | return 0; |
| 202 | } |
| 203 | if (S_ISREG(mode) || !body_len) |
| 204 | read_into(name_buf, N_ALIGN(name_len), GotName); |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static int __init do_skip(void) |
| 209 | { |
| 210 | if (this_header + count < next_header) { |
| 211 | eat(count); |
| 212 | return 1; |
| 213 | } else { |
| 214 | eat(next_header - this_header); |
| 215 | state = next_state; |
| 216 | return 0; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | static int __init do_reset(void) |
| 221 | { |
| 222 | while(count && *victim == '\0') |
| 223 | eat(1); |
| 224 | if (count && (this_header & 3)) |
| 225 | error("broken padding"); |
| 226 | return 1; |
| 227 | } |
| 228 | |
| 229 | static int __init maybe_link(void) |
| 230 | { |
| 231 | if (nlink >= 2) { |
| 232 | char *old = find_link(major, minor, ino, collected); |
| 233 | if (old) |
| 234 | return (sys_link(old, collected) < 0) ? -1 : 1; |
| 235 | } |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static __initdata int wfd; |
| 240 | |
| 241 | static int __init do_name(void) |
| 242 | { |
| 243 | state = SkipIt; |
| 244 | next_state = Reset; |
| 245 | if (strcmp(collected, "TRAILER!!!") == 0) { |
| 246 | free_hash(); |
| 247 | return 0; |
| 248 | } |
| 249 | if (dry_run) |
| 250 | return 0; |
| 251 | if (S_ISREG(mode)) { |
| 252 | if (maybe_link() >= 0) { |
| 253 | wfd = sys_open(collected, O_WRONLY|O_CREAT, mode); |
| 254 | if (wfd >= 0) { |
| 255 | sys_fchown(wfd, uid, gid); |
| 256 | sys_fchmod(wfd, mode); |
| 257 | state = CopyFile; |
| 258 | } |
| 259 | } |
| 260 | } else if (S_ISDIR(mode)) { |
| 261 | sys_mkdir(collected, mode); |
| 262 | sys_chown(collected, uid, gid); |
| 263 | sys_chmod(collected, mode); |
| 264 | } else if (S_ISBLK(mode) || S_ISCHR(mode) || |
| 265 | S_ISFIFO(mode) || S_ISSOCK(mode)) { |
| 266 | if (maybe_link() == 0) { |
| 267 | sys_mknod(collected, mode, rdev); |
| 268 | sys_chown(collected, uid, gid); |
| 269 | sys_chmod(collected, mode); |
| 270 | } |
| 271 | } |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static int __init do_copy(void) |
| 276 | { |
| 277 | if (count >= body_len) { |
| 278 | sys_write(wfd, victim, body_len); |
| 279 | sys_close(wfd); |
| 280 | eat(body_len); |
| 281 | state = SkipIt; |
| 282 | return 0; |
| 283 | } else { |
| 284 | sys_write(wfd, victim, count); |
| 285 | body_len -= count; |
| 286 | eat(count); |
| 287 | return 1; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | static int __init do_symlink(void) |
| 292 | { |
| 293 | collected[N_ALIGN(name_len) + body_len] = '\0'; |
| 294 | sys_symlink(collected + N_ALIGN(name_len), collected); |
| 295 | sys_lchown(collected, uid, gid); |
| 296 | state = SkipIt; |
| 297 | next_state = Reset; |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static __initdata int (*actions[])(void) = { |
| 302 | [Start] = do_start, |
| 303 | [Collect] = do_collect, |
| 304 | [GotHeader] = do_header, |
| 305 | [SkipIt] = do_skip, |
| 306 | [GotName] = do_name, |
| 307 | [CopyFile] = do_copy, |
| 308 | [GotSymlink] = do_symlink, |
| 309 | [Reset] = do_reset, |
| 310 | }; |
| 311 | |
| 312 | static int __init write_buffer(char *buf, unsigned len) |
| 313 | { |
| 314 | count = len; |
| 315 | victim = buf; |
| 316 | |
| 317 | while (!actions[state]()) |
| 318 | ; |
| 319 | return len - count; |
| 320 | } |
| 321 | |
| 322 | static void __init flush_buffer(char *buf, unsigned len) |
| 323 | { |
| 324 | int written; |
| 325 | if (message) |
| 326 | return; |
| 327 | while ((written = write_buffer(buf, len)) < len && !message) { |
| 328 | char c = buf[written]; |
| 329 | if (c == '0') { |
| 330 | buf += written; |
| 331 | len -= written; |
| 332 | state = Start; |
| 333 | } else if (c == 0) { |
| 334 | buf += written; |
| 335 | len -= written; |
| 336 | state = Reset; |
| 337 | } else |
| 338 | error("junk in compressed archive"); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | /* |
| 343 | * gzip declarations |
| 344 | */ |
| 345 | |
| 346 | #define OF(args) args |
| 347 | |
| 348 | #ifndef memzero |
| 349 | #define memzero(s, n) memset ((s), 0, (n)) |
| 350 | #endif |
| 351 | |
| 352 | typedef unsigned char uch; |
| 353 | typedef unsigned short ush; |
| 354 | typedef unsigned long ulg; |
| 355 | |
| 356 | #define WSIZE 0x8000 /* window size--must be a power of two, and */ |
| 357 | /* at least 32K for zip's deflate method */ |
| 358 | |
| 359 | static uch *inbuf; |
| 360 | static uch *window; |
| 361 | |
| 362 | static unsigned insize; /* valid bytes in inbuf */ |
| 363 | static unsigned inptr; /* index of next byte to be processed in inbuf */ |
| 364 | static unsigned outcnt; /* bytes in output buffer */ |
| 365 | static long bytes_out; |
| 366 | |
| 367 | #define get_byte() (inptr < insize ? inbuf[inptr++] : -1) |
| 368 | |
| 369 | /* Diagnostic functions (stubbed out) */ |
| 370 | #define Assert(cond,msg) |
| 371 | #define Trace(x) |
| 372 | #define Tracev(x) |
| 373 | #define Tracevv(x) |
| 374 | #define Tracec(c,x) |
| 375 | #define Tracecv(c,x) |
| 376 | |
| 377 | #define STATIC static |
| 378 | #define INIT __init |
| 379 | |
| 380 | static void __init flush_window(void); |
| 381 | static void __init error(char *m); |
| 382 | static void __init gzip_mark(void **); |
| 383 | static void __init gzip_release(void **); |
| 384 | |
| 385 | #include "../lib/inflate.c" |
| 386 | |
| 387 | static void __init gzip_mark(void **ptr) |
| 388 | { |
| 389 | } |
| 390 | |
| 391 | static void __init gzip_release(void **ptr) |
| 392 | { |
| 393 | } |
| 394 | |
| 395 | /* =========================================================================== |
| 396 | * Write the output window window[0..outcnt-1] and update crc and bytes_out. |
| 397 | * (Used for the decompressed data only.) |
| 398 | */ |
| 399 | static void __init flush_window(void) |
| 400 | { |
| 401 | ulg c = crc; /* temporary variable */ |
| 402 | unsigned n; |
| 403 | uch *in, ch; |
| 404 | |
| 405 | flush_buffer(window, outcnt); |
| 406 | in = window; |
| 407 | for (n = 0; n < outcnt; n++) { |
| 408 | ch = *in++; |
| 409 | c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); |
| 410 | } |
| 411 | crc = c; |
| 412 | bytes_out += (ulg)outcnt; |
| 413 | outcnt = 0; |
| 414 | } |
| 415 | |
| 416 | static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) |
| 417 | { |
| 418 | int written; |
| 419 | dry_run = check_only; |
| 420 | header_buf = malloc(110); |
| 421 | symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1); |
| 422 | name_buf = malloc(N_ALIGN(PATH_MAX)); |
| 423 | window = malloc(WSIZE); |
| 424 | if (!window || !header_buf || !symlink_buf || !name_buf) |
| 425 | panic("can't allocate buffers"); |
| 426 | state = Start; |
| 427 | this_header = 0; |
| 428 | message = NULL; |
| 429 | while (!message && len) { |
| 430 | loff_t saved_offset = this_header; |
| 431 | if (*buf == '0' && !(this_header & 3)) { |
| 432 | state = Start; |
| 433 | written = write_buffer(buf, len); |
| 434 | buf += written; |
| 435 | len -= written; |
| 436 | continue; |
| 437 | } |
| 438 | if (!*buf) { |
| 439 | buf++; |
| 440 | len--; |
| 441 | this_header++; |
| 442 | continue; |
| 443 | } |
| 444 | this_header = 0; |
| 445 | insize = len; |
| 446 | inbuf = buf; |
| 447 | inptr = 0; |
| 448 | outcnt = 0; /* bytes in output buffer */ |
| 449 | bytes_out = 0; |
| 450 | crc = (ulg)0xffffffffL; /* shift register contents */ |
| 451 | makecrc(); |
| 452 | gunzip(); |
| 453 | if (state != Reset) |
| 454 | error("junk in gzipped archive"); |
| 455 | this_header = saved_offset + inptr; |
| 456 | buf += inptr; |
| 457 | len -= inptr; |
| 458 | } |
| 459 | free(window); |
| 460 | free(name_buf); |
| 461 | free(symlink_buf); |
| 462 | free(header_buf); |
| 463 | return message; |
| 464 | } |
| 465 | |
| 466 | extern char __initramfs_start[], __initramfs_end[]; |
| 467 | #ifdef CONFIG_BLK_DEV_INITRD |
| 468 | #include <linux/initrd.h> |
Haren Myneni | 9c15e85 | 2006-02-10 01:51:05 -0800 | [diff] [blame] | 469 | #include <linux/kexec.h> |
Jan Beulich | 0f3d2bd | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 470 | |
| 471 | static void __init free_initrd(void) |
| 472 | { |
Haren Myneni | 9c15e85 | 2006-02-10 01:51:05 -0800 | [diff] [blame] | 473 | #ifdef CONFIG_KEXEC |
| 474 | unsigned long crashk_start = (unsigned long)__va(crashk_res.start); |
| 475 | unsigned long crashk_end = (unsigned long)__va(crashk_res.end); |
| 476 | |
| 477 | /* |
| 478 | * If the initrd region is overlapped with crashkernel reserved region, |
| 479 | * free only memory that is not part of crashkernel region. |
| 480 | */ |
| 481 | if (initrd_start < crashk_end && initrd_end > crashk_start) { |
| 482 | /* |
| 483 | * Initialize initrd memory region since the kexec boot does |
| 484 | * not do. |
| 485 | */ |
| 486 | memset((void *)initrd_start, 0, initrd_end - initrd_start); |
| 487 | if (initrd_start < crashk_start) |
| 488 | free_initrd_mem(initrd_start, crashk_start); |
| 489 | if (initrd_end > crashk_end) |
| 490 | free_initrd_mem(crashk_end, initrd_end); |
| 491 | } else |
| 492 | #endif |
| 493 | free_initrd_mem(initrd_start, initrd_end); |
| 494 | |
Jan Beulich | 0f3d2bd | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 495 | initrd_start = 0; |
| 496 | initrd_end = 0; |
| 497 | } |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | #endif |
| 500 | |
| 501 | void __init populate_rootfs(void) |
| 502 | { |
| 503 | char *err = unpack_to_rootfs(__initramfs_start, |
| 504 | __initramfs_end - __initramfs_start, 0); |
| 505 | if (err) |
| 506 | panic(err); |
| 507 | #ifdef CONFIG_BLK_DEV_INITRD |
| 508 | if (initrd_start) { |
Zdenek Pavlas | 340e48e | 2006-03-25 03:07:49 -0800 | [diff] [blame] | 509 | #ifdef CONFIG_BLK_DEV_RAM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | int fd; |
| 511 | printk(KERN_INFO "checking if image is initramfs..."); |
| 512 | err = unpack_to_rootfs((char *)initrd_start, |
| 513 | initrd_end - initrd_start, 1); |
| 514 | if (!err) { |
| 515 | printk(" it is\n"); |
| 516 | unpack_to_rootfs((char *)initrd_start, |
| 517 | initrd_end - initrd_start, 0); |
Jan Beulich | 0f3d2bd | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 518 | free_initrd(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | return; |
| 520 | } |
| 521 | printk("it isn't (%s); looks like an initrd\n", err); |
| 522 | fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 700); |
| 523 | if (fd >= 0) { |
| 524 | sys_write(fd, (char *)initrd_start, |
| 525 | initrd_end - initrd_start); |
| 526 | sys_close(fd); |
Jan Beulich | 0f3d2bd | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 527 | free_initrd(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
Zdenek Pavlas | 340e48e | 2006-03-25 03:07:49 -0800 | [diff] [blame] | 529 | #else |
| 530 | printk(KERN_INFO "Unpacking initramfs..."); |
| 531 | err = unpack_to_rootfs((char *)initrd_start, |
| 532 | initrd_end - initrd_start, 0); |
| 533 | if (err) |
| 534 | panic(err); |
| 535 | printk(" done\n"); |
| 536 | free_initrd(); |
| 537 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | #endif |
| 540 | } |