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/dirent.h>
9 #include <linux/syscalls.h>
10 #include <linux/utime.h>
12 static __initdata char *message;
13 static void __init error(char *x)
21 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
23 static __initdata struct hash {
24 int ino, minor, major;
27 char name[N_ALIGN(PATH_MAX)];
30 static inline int hash(int major, int minor, int ino)
32 unsigned long tmp = ino + minor + (major << 3);
37 static char __init *find_link(int major, int minor, int ino,
38 mode_t mode, char *name)
41 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
44 if ((*p)->minor != minor)
46 if ((*p)->major != major)
48 if (((*p)->mode ^ mode) & S_IFMT)
52 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
54 panic("can't allocate link hash entry");
59 strcpy(q->name, name);
65 static void __init free_hash(void)
68 for (p = head; p < head + 32; p++) {
77 static long __init do_utime(char __user *filename, time_t mtime)
86 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
89 static __initdata LIST_HEAD(dir_list);
91 struct list_head list;
96 static void __init dir_add(const char *name, time_t mtime)
98 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
100 panic("can't allocate dir_entry buffer");
101 INIT_LIST_HEAD(&de->list);
102 de->name = kstrdup(name, GFP_KERNEL);
104 list_add(&de->list, &dir_list);
107 static void __init dir_utime(void)
109 struct dir_entry *de, *tmp;
110 list_for_each_entry_safe(de, tmp, &dir_list, list) {
112 do_utime(de->name, de->mtime);
118 static __initdata time_t mtime;
120 /* cpio header parsing */
122 static __initdata unsigned long ino, major, minor, nlink;
123 static __initdata mode_t mode;
124 static __initdata unsigned long body_len, name_len;
125 static __initdata uid_t uid;
126 static __initdata gid_t gid;
127 static __initdata unsigned rdev;
129 static void __init parse_header(char *s)
131 unsigned long parsed[12];
136 for (i = 0, s += 6; i < 12; i++, s += 8) {
138 parsed[i] = simple_strtoul(buf, NULL, 16);
146 body_len = parsed[6];
149 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
150 name_len = parsed[11];
155 static __initdata enum state {
166 static __initdata char *victim;
167 static __initdata unsigned count;
168 static __initdata loff_t this_header, next_header;
170 static inline void __init eat(unsigned n)
177 static __initdata char *vcollected;
178 static __initdata char *collected;
179 static __initdata int remains;
180 static __initdata char *collect;
182 static void __init read_into(char *buf, unsigned size, enum state next)
189 collect = collected = buf;
196 static __initdata char *header_buf, *symlink_buf, *name_buf;
198 static int __init do_start(void)
200 read_into(header_buf, 110, GotHeader);
204 static int __init do_collect(void)
206 unsigned n = remains;
209 memcpy(collect, victim, n);
212 if ((remains -= n) != 0)
218 static int __init do_header(void)
220 if (memcmp(collected, "070707", 6)==0) {
221 error("incorrect cpio method used: use -H newc option");
224 if (memcmp(collected, "070701", 6)) {
225 error("no cpio magic");
228 parse_header(collected);
229 next_header = this_header + N_ALIGN(name_len) + body_len;
230 next_header = (next_header + 3) & ~3;
232 if (name_len <= 0 || name_len > PATH_MAX)
235 if (body_len > PATH_MAX)
237 collect = collected = symlink_buf;
238 remains = N_ALIGN(name_len) + body_len;
239 next_state = GotSymlink;
243 if (S_ISREG(mode) || !body_len)
244 read_into(name_buf, N_ALIGN(name_len), GotName);
248 static int __init do_skip(void)
250 if (this_header + count < next_header) {
254 eat(next_header - this_header);
260 static int __init do_reset(void)
262 while(count && *victim == '\0')
264 if (count && (this_header & 3))
265 error("broken padding");
269 static int __init maybe_link(void)
272 char *old = find_link(major, minor, ino, mode, collected);
274 return (sys_link(old, collected) < 0) ? -1 : 1;
279 static void __init clean_path(char *path, mode_t mode)
283 if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
284 if (S_ISDIR(st.st_mode))
291 static __initdata int wfd;
293 static int __init do_name(void)
297 if (strcmp(collected, "TRAILER!!!") == 0) {
301 clean_path(collected, mode);
303 int ml = maybe_link();
305 int openflags = O_WRONLY|O_CREAT;
307 openflags |= O_TRUNC;
308 wfd = sys_open(collected, openflags, mode);
311 sys_fchown(wfd, uid, gid);
312 sys_fchmod(wfd, mode);
314 sys_ftruncate(wfd, body_len);
315 vcollected = kstrdup(collected, GFP_KERNEL);
319 } else if (S_ISDIR(mode)) {
320 sys_mkdir(collected, mode);
321 sys_chown(collected, uid, gid);
322 sys_chmod(collected, mode);
323 dir_add(collected, mtime);
324 } 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);
330 do_utime(collected, mtime);
336 static int __init do_copy(void)
338 if (count >= body_len) {
339 sys_write(wfd, victim, body_len);
341 do_utime(vcollected, mtime);
347 sys_write(wfd, victim, count);
354 static int __init do_symlink(void)
356 collected[N_ALIGN(name_len) + body_len] = '\0';
357 clean_path(collected, 0);
358 sys_symlink(collected + N_ALIGN(name_len), collected);
359 sys_lchown(collected, uid, gid);
360 do_utime(collected, mtime);
366 static __initdata int (*actions[])(void) = {
368 [Collect] = do_collect,
369 [GotHeader] = do_header,
372 [CopyFile] = do_copy,
373 [GotSymlink] = do_symlink,
377 static int __init write_buffer(char *buf, unsigned len)
382 while (!actions[state]())
387 static int __init flush_buffer(void *bufv, unsigned len)
389 char *buf = (char *) bufv;
394 while ((written = write_buffer(buf, len)) < len && !message) {
395 char c = buf[written];
405 error("junk in compressed archive");
410 static unsigned my_inptr; /* index of next byte to be processed in inbuf */
412 #include <linux/decompress/generic.h>
414 static char * __init unpack_to_rootfs(char *buf, unsigned len)
417 decompress_fn decompress;
418 const char *compress_name;
419 static __initdata char msg_buf[64];
421 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);
425 if (!header_buf || !symlink_buf || !name_buf)
426 panic("can't allocate buffers");
431 while (!message && len) {
432 loff_t saved_offset = this_header;
433 if (*buf == '0' && !(this_header & 3)) {
435 written = write_buffer(buf, len);
447 decompress = decompress_method(buf, len, &compress_name);
449 res = decompress(buf, len, NULL, flush_buffer, NULL,
452 error("decompressor failed");
453 } else if (compress_name) {
455 snprintf(msg_buf, sizeof msg_buf,
456 "compression method %s not configured",
461 error("junk in compressed archive");
463 error("junk in compressed archive");
464 this_header = saved_offset + my_inptr;
475 static int __initdata do_retain_initrd;
477 static int __init retain_initrd_param(char *str)
481 do_retain_initrd = 1;
484 __setup("retain_initrd", retain_initrd_param);
486 extern char __initramfs_start[], __initramfs_end[];
487 #include <linux/initrd.h>
488 #include <linux/kexec.h>
490 static void __init free_initrd(void)
493 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
494 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
496 if (do_retain_initrd)
501 * If the initrd region is overlapped with crashkernel reserved region,
502 * free only memory that is not part of crashkernel region.
504 if (initrd_start < crashk_end && initrd_end > crashk_start) {
506 * Initialize initrd memory region since the kexec boot does
509 memset((void *)initrd_start, 0, initrd_end - initrd_start);
510 if (initrd_start < crashk_start)
511 free_initrd_mem(initrd_start, crashk_start);
512 if (initrd_end > crashk_end)
513 free_initrd_mem(crashk_end, initrd_end);
516 free_initrd_mem(initrd_start, initrd_end);
522 #ifdef CONFIG_BLK_DEV_RAM
523 #define BUF_SIZE 1024
524 static void __init clean_rootfs(void)
528 struct linux_dirent64 *dirp;
531 fd = sys_open("/", O_RDONLY, 0);
535 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
543 num = sys_getdents64(fd, dirp, BUF_SIZE);
549 ret = sys_newlstat(dirp->d_name, &st);
552 if (S_ISDIR(st.st_mode))
553 sys_rmdir(dirp->d_name);
555 sys_unlink(dirp->d_name);
558 num -= dirp->d_reclen;
559 dirp = (void *)dirp + dirp->d_reclen;
562 memset(buf, 0, BUF_SIZE);
563 num = sys_getdents64(fd, dirp, BUF_SIZE);
571 static int __init populate_rootfs(void)
573 char *err = unpack_to_rootfs(__initramfs_start,
574 __initramfs_end - __initramfs_start);
576 panic(err); /* Failed to decompress INTERNAL initramfs */
578 #ifdef CONFIG_BLK_DEV_RAM
580 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
581 err = unpack_to_rootfs((char *)initrd_start,
582 initrd_end - initrd_start);
588 unpack_to_rootfs(__initramfs_start,
589 __initramfs_end - __initramfs_start);
591 printk(KERN_INFO "rootfs image is not initramfs (%s)"
592 "; looks like an initrd\n", err);
593 fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
595 sys_write(fd, (char *)initrd_start,
596 initrd_end - initrd_start);
601 printk(KERN_INFO "Unpacking initramfs...\n");
602 err = unpack_to_rootfs((char *)initrd_start,
603 initrd_end - initrd_start);
605 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
611 rootfs_initcall(populate_rootfs);