2 * Many of the syscalls used in this file expect some of the arguments
3 * to be __user pointers not __kernel pointers. To limit the sparse
4 * noise, turn off sparse checking for this file.
8 #warning "Sparse checking disabled for this file"
11 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/delay.h>
17 #include <linux/string.h>
18 #include <linux/dirent.h>
19 #include <linux/syscalls.h>
20 #include <linux/utime.h>
22 static __initdata char *message;
23 static void __init error(char *x)
31 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
33 static __initdata struct hash {
34 int ino, minor, major;
37 char name[N_ALIGN(PATH_MAX)];
40 static inline int hash(int major, int minor, int ino)
42 unsigned long tmp = ino + minor + (major << 3);
47 static char __init *find_link(int major, int minor, int ino,
48 umode_t mode, char *name)
51 for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
54 if ((*p)->minor != minor)
56 if ((*p)->major != major)
58 if (((*p)->mode ^ mode) & S_IFMT)
62 q = kmalloc(sizeof(struct hash), GFP_KERNEL);
64 panic("can't allocate link hash entry");
69 strcpy(q->name, name);
75 static void __init free_hash(void)
78 for (p = head; p < head + 32; p++) {
87 static long __init do_utime(char *filename, time_t mtime)
96 return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
99 static __initdata LIST_HEAD(dir_list);
101 struct list_head list;
106 static void __init dir_add(const char *name, time_t mtime)
108 struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
110 panic("can't allocate dir_entry buffer");
111 INIT_LIST_HEAD(&de->list);
112 de->name = kstrdup(name, GFP_KERNEL);
114 list_add(&de->list, &dir_list);
117 static void __init dir_utime(void)
119 struct dir_entry *de, *tmp;
120 list_for_each_entry_safe(de, tmp, &dir_list, list) {
122 do_utime(de->name, de->mtime);
128 static __initdata time_t mtime;
130 /* cpio header parsing */
132 static __initdata unsigned long ino, major, minor, nlink;
133 static __initdata umode_t mode;
134 static __initdata unsigned long body_len, name_len;
135 static __initdata uid_t uid;
136 static __initdata gid_t gid;
137 static __initdata unsigned rdev;
139 static void __init parse_header(char *s)
141 unsigned long parsed[12];
146 for (i = 0, s += 6; i < 12; i++, s += 8) {
148 parsed[i] = simple_strtoul(buf, NULL, 16);
156 body_len = parsed[6];
159 rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
160 name_len = parsed[11];
165 static __initdata enum state {
176 static __initdata char *victim;
177 static __initdata unsigned count;
178 static __initdata loff_t this_header, next_header;
180 static inline void __init eat(unsigned n)
187 static __initdata char *vcollected;
188 static __initdata char *collected;
189 static __initdata int remains;
190 static __initdata char *collect;
192 static void __init read_into(char *buf, unsigned size, enum state next)
199 collect = collected = buf;
206 static __initdata char *header_buf, *symlink_buf, *name_buf;
208 static int __init do_start(void)
210 read_into(header_buf, 110, GotHeader);
214 static int __init do_collect(void)
216 unsigned n = remains;
219 memcpy(collect, victim, n);
222 if ((remains -= n) != 0)
228 static int __init do_header(void)
230 if (memcmp(collected, "070707", 6)==0) {
231 error("incorrect cpio method used: use -H newc option");
234 if (memcmp(collected, "070701", 6)) {
235 error("no cpio magic");
238 parse_header(collected);
239 next_header = this_header + N_ALIGN(name_len) + body_len;
240 next_header = (next_header + 3) & ~3;
242 if (name_len <= 0 || name_len > PATH_MAX)
245 if (body_len > PATH_MAX)
247 collect = collected = symlink_buf;
248 remains = N_ALIGN(name_len) + body_len;
249 next_state = GotSymlink;
253 if (S_ISREG(mode) || !body_len)
254 read_into(name_buf, N_ALIGN(name_len), GotName);
258 static int __init do_skip(void)
260 if (this_header + count < next_header) {
264 eat(next_header - this_header);
270 static int __init do_reset(void)
272 while(count && *victim == '\0')
274 if (count && (this_header & 3))
275 error("broken padding");
279 static int __init maybe_link(void)
282 char *old = find_link(major, minor, ino, mode, collected);
284 return (sys_link(old, collected) < 0) ? -1 : 1;
289 static void __init clean_path(char *path, umode_t mode)
293 if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
294 if (S_ISDIR(st.st_mode))
301 static __initdata int wfd;
303 static int __init do_name(void)
307 if (strcmp(collected, "TRAILER!!!") == 0) {
311 clean_path(collected, mode);
313 int ml = maybe_link();
315 int openflags = O_WRONLY|O_CREAT;
317 openflags |= O_TRUNC;
318 wfd = sys_open(collected, openflags, mode);
321 sys_fchown(wfd, uid, gid);
322 sys_fchmod(wfd, mode);
324 sys_ftruncate(wfd, body_len);
325 vcollected = kstrdup(collected, GFP_KERNEL);
329 } else if (S_ISDIR(mode)) {
330 sys_mkdir(collected, mode);
331 sys_chown(collected, uid, gid);
332 sys_chmod(collected, mode);
333 dir_add(collected, mtime);
334 } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
335 S_ISFIFO(mode) || S_ISSOCK(mode)) {
336 if (maybe_link() == 0) {
337 sys_mknod(collected, mode, rdev);
338 sys_chown(collected, uid, gid);
339 sys_chmod(collected, mode);
340 do_utime(collected, mtime);
346 static int __init do_copy(void)
348 if (count >= body_len) {
349 sys_write(wfd, victim, body_len);
351 do_utime(vcollected, mtime);
357 sys_write(wfd, victim, count);
364 static int __init do_symlink(void)
366 collected[N_ALIGN(name_len) + body_len] = '\0';
367 clean_path(collected, 0);
368 sys_symlink(collected + N_ALIGN(name_len), collected);
369 sys_lchown(collected, uid, gid);
370 do_utime(collected, mtime);
376 static __initdata int (*actions[])(void) = {
378 [Collect] = do_collect,
379 [GotHeader] = do_header,
382 [CopyFile] = do_copy,
383 [GotSymlink] = do_symlink,
387 static int __init write_buffer(char *buf, unsigned len)
392 while (!actions[state]())
397 static int __init flush_buffer(void *bufv, unsigned len)
399 char *buf = (char *) bufv;
404 while ((written = write_buffer(buf, len)) < len && !message) {
405 char c = buf[written];
415 error("junk in compressed archive");
420 static unsigned my_inptr; /* index of next byte to be processed in inbuf */
422 #include <linux/decompress/generic.h>
424 static char * __init unpack_to_rootfs(char *buf, unsigned len)
427 decompress_fn decompress;
428 const char *compress_name;
429 static __initdata char msg_buf[64];
431 header_buf = kmalloc(110, GFP_KERNEL);
432 symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
433 name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
435 if (!header_buf || !symlink_buf || !name_buf)
436 panic("can't allocate buffers");
441 while (!message && len) {
442 loff_t saved_offset = this_header;
443 if (*buf == '0' && !(this_header & 3)) {
445 written = write_buffer(buf, len);
457 decompress = decompress_method(buf, len, &compress_name);
459 res = decompress(buf, len, NULL, flush_buffer, NULL,
462 error("decompressor failed");
463 } else if (compress_name) {
465 snprintf(msg_buf, sizeof msg_buf,
466 "compression method %s not configured",
471 error("junk in compressed archive");
473 error("junk in compressed archive");
474 this_header = saved_offset + my_inptr;
485 static int __initdata do_retain_initrd;
487 static int __init retain_initrd_param(char *str)
491 do_retain_initrd = 1;
494 __setup("retain_initrd", retain_initrd_param);
496 extern char __initramfs_start[];
497 extern unsigned long __initramfs_size;
498 #include <linux/initrd.h>
499 #include <linux/kexec.h>
501 static void __init free_initrd(void)
504 unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
505 unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
507 if (do_retain_initrd)
512 * If the initrd region is overlapped with crashkernel reserved region,
513 * free only memory that is not part of crashkernel region.
515 if (initrd_start < crashk_end && initrd_end > crashk_start) {
517 * Initialize initrd memory region since the kexec boot does
520 memset((void *)initrd_start, 0, initrd_end - initrd_start);
521 if (initrd_start < crashk_start)
522 free_initrd_mem(initrd_start, crashk_start);
523 if (initrd_end > crashk_end)
524 free_initrd_mem(crashk_end, initrd_end);
527 free_initrd_mem(initrd_start, initrd_end);
533 #ifdef CONFIG_BLK_DEV_RAM
534 #define BUF_SIZE 1024
535 static void __init clean_rootfs(void)
539 struct linux_dirent64 *dirp;
542 fd = sys_open("/", O_RDONLY, 0);
546 buf = kzalloc(BUF_SIZE, GFP_KERNEL);
554 num = sys_getdents64(fd, dirp, BUF_SIZE);
560 ret = sys_newlstat(dirp->d_name, &st);
563 if (S_ISDIR(st.st_mode))
564 sys_rmdir(dirp->d_name);
566 sys_unlink(dirp->d_name);
569 num -= dirp->d_reclen;
570 dirp = (void *)dirp + dirp->d_reclen;
573 memset(buf, 0, BUF_SIZE);
574 num = sys_getdents64(fd, dirp, BUF_SIZE);
582 static int __init populate_rootfs(void)
584 char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
586 panic("%s", err); /* Failed to decompress INTERNAL initramfs */
588 #ifdef CONFIG_BLK_DEV_RAM
590 printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
591 err = unpack_to_rootfs((char *)initrd_start,
592 initrd_end - initrd_start);
598 unpack_to_rootfs(__initramfs_start, __initramfs_size);
600 printk(KERN_INFO "rootfs image is not initramfs (%s)"
601 "; looks like an initrd\n", err);
602 fd = sys_open("/initrd.image",
603 O_WRONLY|O_CREAT, 0700);
605 sys_write(fd, (char *)initrd_start,
606 initrd_end - initrd_start);
612 printk(KERN_INFO "Unpacking initramfs...\n");
613 err = unpack_to_rootfs((char *)initrd_start,
614 initrd_end - initrd_start);
616 printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
620 * Try loading default modules from initramfs. This gives
621 * us a chance to load before device_initcalls.
623 load_default_modules();
627 rootfs_initcall(populate_rootfs);