1 #include <linux/init.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 #include <linux/utime.h>
11 static __initdata char *message;
12 static void __init error(char *x)
20 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
22 static __initdata struct hash {
23 int ino, minor, major;
26 char name[N_ALIGN(PATH_MAX)];
29 static inline int hash(int major, int minor, int ino)
31 unsigned long tmp = ino + minor + (major << 3);
36 static char __init *find_link(int major, int minor, int ino,
37 mode_t mode, char *name)
40 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
43 if ((*p)->minor != minor)
45 if ((*p)->major != major)
47 if (((*p)->mode ^ mode) & S_IFMT)
51 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
53 panic("can't allocate link hash entry");
58 strcpy(q->name, name);
64 static void __init free_hash(void)
67 for (p = head; p < head + 32; p++) {
76 static long __init do_utime(char __user *filename, time_t mtime)
85 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
88 static __initdata LIST_HEAD(dir_list);
90 struct list_head list;
95 static void __init dir_add(const char *name, time_t mtime)
97 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
99 panic("can't allocate dir_entry buffer");
100 INIT_LIST_HEAD(&de->list);
101 de->name = kstrdup(name, GFP_KERNEL);
103 list_add(&de->list, &dir_list);
106 static void __init dir_utime(void)
108 struct dir_entry *de, *tmp;
109 list_for_each_entry_safe(de, tmp, &dir_list, list) {
111 do_utime(de->name, de->mtime);
117 static __initdata time_t mtime;
119 /* cpio header parsing */
121 static __initdata unsigned long ino, major, minor, nlink;
122 static __initdata mode_t mode;
123 static __initdata unsigned long body_len, name_len;
124 static __initdata uid_t uid;
125 static __initdata gid_t gid;
126 static __initdata unsigned rdev;
128 static void __init parse_header(char *s)
130 unsigned long parsed[12];
135 for (i = 0, s += 6; i < 12; i++, s += 8) {
137 parsed[i] = simple_strtoul(buf, NULL, 16);
145 body_len = parsed[6];
148 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
149 name_len = parsed[11];
154 static __initdata enum state {
165 static __initdata char *victim;
166 static __initdata unsigned count;
167 static __initdata loff_t this_header, next_header;
169 static __initdata int dry_run;
171 static inline void __init eat(unsigned n)
178 static __initdata char *vcollected;
179 static __initdata char *collected;
180 static __initdata int remains;
181 static __initdata char *collect;
183 static void __init read_into(char *buf, unsigned size, enum state next)
190 collect = collected = buf;
197 static __initdata char *header_buf, *symlink_buf, *name_buf;
199 static int __init do_start(void)
201 read_into(header_buf, 110, GotHeader);
205 static int __init do_collect(void)
207 unsigned n = remains;
210 memcpy(collect, victim, n);
213 if ((remains -= n) != 0)
219 static int __init do_header(void)
221 if (memcmp(collected, "070707", 6)==0) {
222 error("incorrect cpio method used: use -H newc option");
225 if (memcmp(collected, "070701", 6)) {
226 error("no cpio magic");
229 parse_header(collected);
230 next_header = this_header + N_ALIGN(name_len) + body_len;
231 next_header = (next_header + 3) & ~3;
233 read_into(name_buf, N_ALIGN(name_len), GotName);
237 if (name_len <= 0 || name_len > PATH_MAX)
240 if (body_len > PATH_MAX)
242 collect = collected = symlink_buf;
243 remains = N_ALIGN(name_len) + body_len;
244 next_state = GotSymlink;
248 if (S_ISREG(mode) || !body_len)
249 read_into(name_buf, N_ALIGN(name_len), GotName);
253 static int __init do_skip(void)
255 if (this_header + count < next_header) {
259 eat(next_header - this_header);
265 static int __init do_reset(void)
267 while(count && *victim == '\0')
269 if (count && (this_header & 3))
270 error("broken padding");
274 static int __init maybe_link(void)
277 char *old = find_link(major, minor, ino, mode, collected);
279 return (sys_link(old, collected) < 0) ? -1 : 1;
284 static void __init clean_path(char *path, mode_t mode)
288 if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
289 if (S_ISDIR(st.st_mode))
296 static __initdata int wfd;
298 static int __init do_name(void)
302 if (strcmp(collected, "TRAILER!!!") == 0) {
308 clean_path(collected, mode);
310 int ml = maybe_link();
312 int openflags = O_WRONLY|O_CREAT;
314 openflags |= O_TRUNC;
315 wfd = sys_open(collected, openflags, mode);
318 sys_fchown(wfd, uid, gid);
319 sys_fchmod(wfd, mode);
320 sys_ftruncate(wfd, body_len);
321 vcollected = kstrdup(collected, GFP_KERNEL);
325 } else if (S_ISDIR(mode)) {
326 sys_mkdir(collected, mode);
327 sys_chown(collected, uid, gid);
328 sys_chmod(collected, mode);
329 dir_add(collected, mtime);
330 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
331 S_ISFIFO(mode) || S_ISSOCK(mode)) {
332 if (maybe_link() == 0) {
333 sys_mknod(collected, mode, rdev);
334 sys_chown(collected, uid, gid);
335 sys_chmod(collected, mode);
336 do_utime(collected, mtime);
342 static int __init do_copy(void)
344 if (count >= body_len) {
345 sys_write(wfd, victim, body_len);
347 do_utime(vcollected, mtime);
353 sys_write(wfd, victim, count);
360 static int __init do_symlink(void)
362 collected[N_ALIGN(name_len) + body_len] = '\0';
363 clean_path(collected, 0);
364 sys_symlink(collected + N_ALIGN(name_len), collected);
365 sys_lchown(collected, uid, gid);
366 do_utime(collected, mtime);
372 static __initdata int (*actions[])(void) = {
374 [Collect] = do_collect,
375 [GotHeader] = do_header,
378 [CopyFile] = do_copy,
379 [GotSymlink] = do_symlink,
383 static int __init write_buffer(char *buf, unsigned len)
388 while (!actions[state]())
393 static int __init flush_buffer(void *bufv, unsigned len)
395 char *buf = (char *) bufv;
400 while ((written = write_buffer(buf, len)) < len && !message) {
401 char c = buf[written];
411 error("junk in compressed archive");
416 static unsigned my_inptr; /* index of next byte to be processed in inbuf */
418 #include <linux/decompress/generic.h>
420 static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
423 decompress_fn decompress;
425 dry_run = check_only;
426 header_buf = kmalloc(110, GFP_KERNEL);
427 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
428 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
430 if (!header_buf || !symlink_buf || !name_buf)
431 panic("can't allocate buffers");
436 while (!message && len) {
437 loff_t saved_offset = this_header;
438 if (*buf == '0' && !(this_header & 3)) {
440 written = write_buffer(buf, len);
452 decompress = decompress_method(buf, len, NULL);
454 decompress(buf, len, NULL, flush_buffer, NULL,
457 error("junk in compressed archive");
458 this_header = saved_offset + my_inptr;
469 static int __initdata do_retain_initrd;
471 static int __init retain_initrd_param(char *str)
475 do_retain_initrd = 1;
478 __setup("retain_initrd", retain_initrd_param);
480 extern char __initramfs_start[], __initramfs_end[];
481 #include <linux/initrd.h>
482 #include <linux/kexec.h>
484 static void __init free_initrd(void)
487 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
488 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
490 if (do_retain_initrd)
495 * If the initrd region is overlapped with crashkernel reserved region,
496 * free only memory that is not part of crashkernel region.
498 if (initrd_start < crashk_end && initrd_end > crashk_start) {
500 * Initialize initrd memory region since the kexec boot does
503 memset((void *)initrd_start, 0, initrd_end - initrd_start);
504 if (initrd_start < crashk_start)
505 free_initrd_mem(initrd_start, crashk_start);
506 if (initrd_end > crashk_end)
507 free_initrd_mem(crashk_end, initrd_end);
510 free_initrd_mem(initrd_start, initrd_end);
516 static int __init populate_rootfs(void)
518 char *err = unpack_to_rootfs(__initramfs_start,
519 __initramfs_end - __initramfs_start, 0);
523 #ifdef CONFIG_BLK_DEV_RAM
525 printk(KERN_INFO "checking if image is initramfs...");
526 err = unpack_to_rootfs((char *)initrd_start,
527 initrd_end - initrd_start, 1);
530 unpack_to_rootfs((char *)initrd_start,
531 initrd_end - initrd_start, 0);
535 printk("it isn't (%s); looks like an initrd\n", err);
536 fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
538 sys_write(fd, (char *)initrd_start,
539 initrd_end - initrd_start);
544 printk(KERN_INFO "Unpacking initramfs...");
545 err = unpack_to_rootfs((char *)initrd_start,
546 initrd_end - initrd_start, 0);
555 rootfs_initcall(populate_rootfs);