init/initramfs.c - kernel/msm-4.9 - Gitiles

 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/fcntl.h>
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/syscalls.h>

 static __initdata char *message;
 static void __init error(char *x)
 {
 	if (!message)
 		message = x;
 }

 static void __init *malloc(size_t size)
 {
 	return kmalloc(size, GFP_KERNEL);
 }

 static void __init free(void *where)
 {
 	kfree(where);
 }

 /* link hash */

 #define N_ALIGN(len) ((((len) + 1) & ~3) + 2)

 static __initdata struct hash {
 	int ino, minor, major;
 	mode_t mode;
 	struct hash *next;
 	char name[N_ALIGN(PATH_MAX)];
 } *head[32];

 static inline int hash(int major, int minor, int ino)
 {
 	unsigned long tmp = ino + minor + (major << 3);
 	tmp += tmp >> 5;
 	return tmp & 31;
 }

 static char __init *find_link(int major, int minor, int ino,
 			      mode_t mode, char *name)
 {
 	struct hash **p, *q;
 	for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
 		if ((*p)->ino != ino)
 			continue;
 		if ((*p)->minor != minor)
 			continue;
 		if ((*p)->major != major)
 			continue;
 		if (((*p)->mode ^ mode) & S_IFMT)
 			continue;
 		return (*p)->name;
 	}
 	q = (struct hash *)malloc(sizeof(struct hash));
 	if (!q)
 		panic("can't allocate link hash entry");
 	q->major = major;
 	q->minor = minor;
 	q->ino = ino;
 	q->mode = mode;
 	strcpy(q->name, name);
 	q->next = NULL;
 	*p = q;
 	return NULL;
 }

 static void __init free_hash(void)
 {
 	struct hash **p, *q;
 	for (p = head; p < head + 32; p++) {
 		while (*p) {
 			q = *p;
 			*p = q->next;
 			free(q);
 		}
 	}
 }

 /* cpio header parsing */

 static __initdata unsigned long ino, major, minor, nlink;
 static __initdata mode_t mode;
 static __initdata unsigned long body_len, name_len;
 static __initdata uid_t uid;
 static __initdata gid_t gid;
 static __initdata unsigned rdev;

 static void __init parse_header(char *s)
 {
 	unsigned long parsed[12];
 	char buf[9];
 	int i;

 	buf[8] = '\0';
 	for (i = 0, s += 6; i < 12; i++, s += 8) {
 		memcpy(buf, s, 8);
 		parsed[i] = simple_strtoul(buf, NULL, 16);
 	}
 	ino = parsed[0];
 	mode = parsed[1];
 	uid = parsed[2];
 	gid = parsed[3];
 	nlink = parsed[4];
 	body_len = parsed[6];
 	major = parsed[7];
 	minor = parsed[8];
 	rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
 	name_len = parsed[11];
 }

 /* FSM */

 static __initdata enum state {
 	Start,
 	Collect,
 	GotHeader,
 	SkipIt,
 	GotName,
 	CopyFile,
 	GotSymlink,
 	Reset
 } state, next_state;

 static __initdata char *victim;
 static __initdata unsigned count;
 static __initdata loff_t this_header, next_header;

 static __initdata int dry_run;

 static inline void __init eat(unsigned n)
 {
 	victim += n;
 	this_header += n;
 	count -= n;
 }

 static __initdata char *collected;
 static __initdata int remains;
 static __initdata char *collect;

 static void __init read_into(char *buf, unsigned size, enum state next)
 {
 	if (count >= size) {
 		collected = victim;
 		eat(size);
 		state = next;
 	} else {
 		collect = collected = buf;
 		remains = size;
 		next_state = next;
 		state = Collect;
 	}
 }

 static __initdata char *header_buf, *symlink_buf, *name_buf;

 static int __init do_start(void)
 {
 	read_into(header_buf, 110, GotHeader);
 	return 0;
 }

 static int __init do_collect(void)
 {
 	unsigned n = remains;
 	if (count < n)
 		n = count;
 	memcpy(collect, victim, n);
 	eat(n);
 	collect += n;
 	if ((remains -= n) != 0)
 		return 1;
 	state = next_state;
 	return 0;
 }

 static int __init do_header(void)
 {
 	if (memcmp(collected, "070707", 6)==0) {
 		error("incorrect cpio method used: use -H newc option");
 		return 1;
 	}
 	if (memcmp(collected, "070701", 6)) {
 		error("no cpio magic");
 		return 1;
 	}
 	parse_header(collected);
 	next_header = this_header + N_ALIGN(name_len) + body_len;
 	next_header = (next_header + 3) & ~3;
 	if (dry_run) {
 		read_into(name_buf, N_ALIGN(name_len), GotName);
 		return 0;
 	}
 	state = SkipIt;
 	if (name_len <= 0 || name_len > PATH_MAX)
 		return 0;
 	if (S_ISLNK(mode)) {
 		if (body_len > PATH_MAX)
 			return 0;
 		collect = collected = symlink_buf;
 		remains = N_ALIGN(name_len) + body_len;
 		next_state = GotSymlink;
 		state = Collect;
 		return 0;
 	}
 	if (S_ISREG(mode) || !body_len)
 		read_into(name_buf, N_ALIGN(name_len), GotName);
 	return 0;
 }

 static int __init do_skip(void)
 {
 	if (this_header + count < next_header) {
 		eat(count);
 		return 1;
 	} else {
 		eat(next_header - this_header);
 		state = next_state;
 		return 0;
 	}
 }

 static int __init do_reset(void)
 {
 	while(count && *victim == '\0')
 		eat(1);
 	if (count && (this_header & 3))
 		error("broken padding");
 	return 1;
 }

 static int __init maybe_link(void)
 {
 	if (nlink >= 2) {
 		char *old = find_link(major, minor, ino, mode, collected);
 		if (old)
 			return (sys_link(old, collected) < 0) ? -1 : 1;
 	}
 	return 0;
 }

 static void __init clean_path(char *path, mode_t mode)
 {
 	struct stat st;

 	if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
 		if (S_ISDIR(st.st_mode))
 			sys_rmdir(path);
 		else
 			sys_unlink(path);
 	}
 }

 static __initdata int wfd;

 static int __init do_name(void)
 {
 	state = SkipIt;
 	next_state = Reset;
 	if (strcmp(collected, "TRAILER!!!") == 0) {
 		free_hash();
 		return 0;
 	}
 	if (dry_run)
 		return 0;
 	clean_path(collected, mode);
 	if (S_ISREG(mode)) {
 		int ml = maybe_link();
 		if (ml >= 0) {
 			int openflags = O_WRONLY|O_CREAT;
 			if (ml != 1)
 				openflags |= O_TRUNC;
 			wfd = sys_open(collected, openflags, mode);

 			if (wfd >= 0) {
 				sys_fchown(wfd, uid, gid);
 				sys_fchmod(wfd, mode);
 				state = CopyFile;
 			}
 		}
 	} else if (S_ISDIR(mode)) {
 		sys_mkdir(collected, mode);
 		sys_chown(collected, uid, gid);
 		sys_chmod(collected, mode);
 	} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
 		   S_ISFIFO(mode) || S_ISSOCK(mode)) {
 		if (maybe_link() == 0) {
 			sys_mknod(collected, mode, rdev);
 			sys_chown(collected, uid, gid);
 			sys_chmod(collected, mode);
 		}
 	}
 	return 0;
 }

 static int __init do_copy(void)
 {
 	if (count >= body_len) {
 		sys_write(wfd, victim, body_len);
 		sys_close(wfd);
 		eat(body_len);
 		state = SkipIt;
 		return 0;
 	} else {
 		sys_write(wfd, victim, count);
 		body_len -= count;
 		eat(count);
 		return 1;
 	}
 }

 static int __init do_symlink(void)
 {
 	collected[N_ALIGN(name_len) + body_len] = '\0';
 	clean_path(collected, 0);
 	sys_symlink(collected + N_ALIGN(name_len), collected);
 	sys_lchown(collected, uid, gid);
 	state = SkipIt;
 	next_state = Reset;
 	return 0;
 }

 static __initdata int (*actions[])(void) = {
 	[Start]		= do_start,
 	[Collect]	= do_collect,
 	[GotHeader]	= do_header,
 	[SkipIt]	= do_skip,
 	[GotName]	= do_name,
 	[CopyFile]	= do_copy,
 	[GotSymlink]	= do_symlink,
 	[Reset]		= do_reset,
 };

 static int __init write_buffer(char *buf, unsigned len)
 {
 	count = len;
 	victim = buf;

 	while (!actions[state]())
 		;
 	return len - count;
 }

 static void __init flush_buffer(char *buf, unsigned len)
 {
 	int written;
 	if (message)
 		return;
 	while ((written = write_buffer(buf, len)) < len && !message) {
 		char c = buf[written];
 		if (c == '0') {
 			buf += written;
 			len -= written;
 			state = Start;
 		} else if (c == 0) {
 			buf += written;
 			len -= written;
 			state = Reset;
 		} else
 			error("junk in compressed archive");
 	}
 }

 /*
  * gzip declarations
  */

 #define OF(args)  args

 #ifndef memzero
 #define memzero(s, n)     memset ((s), 0, (n))
 #endif

 typedef unsigned char  uch;
 typedef unsigned short ush;
 typedef unsigned long  ulg;

 #define WSIZE 0x8000    /* window size--must be a power of two, and */
 			/*  at least 32K for zip's deflate method */

 static uch *inbuf;
 static uch *window;

 static unsigned insize;  /* valid bytes in inbuf */
 static unsigned inptr;   /* index of next byte to be processed in inbuf */
 static unsigned outcnt;  /* bytes in output buffer */
 static long bytes_out;

 #define get_byte()  (inptr < insize ? inbuf[inptr++] : -1)

 /* Diagnostic functions (stubbed out) */
 #define Assert(cond,msg)
 #define Trace(x)
 #define Tracev(x)
 #define Tracevv(x)
 #define Tracec(c,x)
 #define Tracecv(c,x)

 #define STATIC static
 #define INIT __init

 static void __init flush_window(void);
 static void __init error(char *m);
 static void __init gzip_mark(void **);
 static void __init gzip_release(void **);

 #include "../lib/inflate.c"

 static void __init gzip_mark(void **ptr)
 {
 }

 static void __init gzip_release(void **ptr)
 {
 }

 /* ===========================================================================
  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
  * (Used for the decompressed data only.)
  */
 static void __init flush_window(void)
 {
 	ulg c = crc;         /* temporary variable */
 	unsigned n;
 	uch *in, ch;

 	flush_buffer(window, outcnt);
 	in = window;
 	for (n = 0; n < outcnt; n++) {
 		ch = *in++;
 		c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 	}
 	crc = c;
 	bytes_out += (ulg)outcnt;
 	outcnt = 0;
 }

 static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
 {
 	int written;
 	dry_run = check_only;
 	header_buf = malloc(110);
 	symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);
 	name_buf = malloc(N_ALIGN(PATH_MAX));
 	window = malloc(WSIZE);
 	if (!window || !header_buf || !symlink_buf || !name_buf)
 		panic("can't allocate buffers");
 	state = Start;
 	this_header = 0;
 	message = NULL;
 	while (!message && len) {
 		loff_t saved_offset = this_header;
 		if (*buf == '0' && !(this_header & 3)) {
 			state = Start;
 			written = write_buffer(buf, len);
 			buf += written;
 			len -= written;
 			continue;
 		}
 		if (!*buf) {
 			buf++;
 			len--;
 			this_header++;
 			continue;
 		}
 		this_header = 0;
 		insize = len;
 		inbuf = buf;
 		inptr = 0;
 		outcnt = 0;		/* bytes in output buffer */
 		bytes_out = 0;
 		crc = (ulg)0xffffffffL; /* shift register contents */
 		makecrc();
 		gunzip();
 		if (state != Reset)
 			error("junk in gzipped archive");
 		this_header = saved_offset + inptr;
 		buf += inptr;
 		len -= inptr;
 	}
 	free(window);
 	free(name_buf);
 	free(symlink_buf);
 	free(header_buf);
 	return message;
 }

 static int __initdata do_retain_initrd;

 static int __init retain_initrd_param(char *str)
 {
 	if (*str)
 		return 0;
 	do_retain_initrd = 1;
 	return 1;
 }
 __setup("retain_initrd", retain_initrd_param);

 extern char __initramfs_start[], __initramfs_end[];
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/initrd.h>
 #include <linux/kexec.h>

 static void __init free_initrd(void)
 {
 #ifdef CONFIG_KEXEC
 	unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
 	unsigned long crashk_end   = (unsigned long)__va(crashk_res.end);
 #endif
 	if (do_retain_initrd)
 		goto skip;

 #ifdef CONFIG_KEXEC
 	/*
 	 * If the initrd region is overlapped with crashkernel reserved region,
 	 * free only memory that is not part of crashkernel region.
 	 */
 	if (initrd_start < crashk_end && initrd_end > crashk_start) {
 		/*
 		 * Initialize initrd memory region since the kexec boot does
 		 * not do.
 		 */
 		memset((void *)initrd_start, 0, initrd_end - initrd_start);
 		if (initrd_start < crashk_start)
 			free_initrd_mem(initrd_start, crashk_start);
 		if (initrd_end > crashk_end)
 			free_initrd_mem(crashk_end, initrd_end);
 	} else
 #endif
 		free_initrd_mem(initrd_start, initrd_end);
 skip:
 	initrd_start = 0;
 	initrd_end = 0;
 }

 #endif

 static int __init populate_rootfs(void)
 {
 	char *err = unpack_to_rootfs(__initramfs_start,
 			 __initramfs_end - __initramfs_start, 0);
 	if (err)
 		panic(err);
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (initrd_start) {
 #ifdef CONFIG_BLK_DEV_RAM
 		int fd;
 		printk(KERN_INFO "checking if image is initramfs...");
 		err = unpack_to_rootfs((char *)initrd_start,
 			initrd_end - initrd_start, 1);
 		if (!err) {
 			printk(" it is\n");
 			unpack_to_rootfs((char *)initrd_start,
 				initrd_end - initrd_start, 0);
 			free_initrd();
 			return 0;
 		}
 		printk("it isn't (%s); looks like an initrd\n", err);
 		fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
 		if (fd >= 0) {
 			sys_write(fd, (char *)initrd_start,
 					initrd_end - initrd_start);
 			sys_close(fd);
 			free_initrd();
 		}
 #else
 		printk(KERN_INFO "Unpacking initramfs...");
 		err = unpack_to_rootfs((char *)initrd_start,
 			initrd_end - initrd_start, 0);
 		if (err)
 			panic(err);
 		printk(" done\n");
 		free_initrd();
 #endif
 	}
 #endif
 	return 0;
 }
 rootfs_initcall(populate_rootfs);
	#include <linux/init.h>
	#include <linux/fs.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/fcntl.h>
	#include <linux/delay.h>
	#include <linux/string.h>
	#include <linux/syscalls.h>

	static __initdata char *message;
	static void __init error(char *x)
	{
	if (!message)
	message = x;
	}

	static void __init *malloc(size_t size)
	{
	return kmalloc(size, GFP_KERNEL);
	}

	static void __init free(void *where)
	{
	kfree(where);
	}

	/* link hash */

	#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)

	static __initdata struct hash {
	int ino, minor, major;
	mode_t mode;
	struct hash *next;
	char name[N_ALIGN(PATH_MAX)];
	} *head[32];

	static inline int hash(int major, int minor, int ino)
	{
	unsigned long tmp = ino + minor + (major << 3);
	tmp += tmp >> 5;
	return tmp & 31;
	}

	static char __init *find_link(int major, int minor, int ino,
	mode_t mode, char *name)
	{
	struct hash *p, q;
	for (p = head + hash(major, minor, ino); p; p = &(p)->next) {
	if ((*p)->ino != ino)
	continue;
	if ((*p)->minor != minor)
	continue;
	if ((*p)->major != major)
	continue;
	if (((*p)->mode ^ mode) & S_IFMT)
	continue;
	return (*p)->name;
	}
	q = (struct hash *)malloc(sizeof(struct hash));
	if (!q)
	panic("can't allocate link hash entry");
	q->major = major;
	q->minor = minor;
	q->ino = ino;
	q->mode = mode;
	strcpy(q->name, name);
	q->next = NULL;
	*p = q;
	return NULL;
	}

	static void __init free_hash(void)
	{
	struct hash *p, q;
	for (p = head; p < head + 32; p++) {
	while (*p) {
	q = *p;
	*p = q->next;
	free(q);
	}
	}
	}

	/* cpio header parsing */

	static __initdata unsigned long ino, major, minor, nlink;
	static __initdata mode_t mode;
	static __initdata unsigned long body_len, name_len;
	static __initdata uid_t uid;
	static __initdata gid_t gid;
	static __initdata unsigned rdev;

	static void __init parse_header(char *s)
	{
	unsigned long parsed[12];
	char buf[9];
	int i;

	buf[8] = '\0';
	for (i = 0, s += 6; i < 12; i++, s += 8) {
	memcpy(buf, s, 8);
	parsed[i] = simple_strtoul(buf, NULL, 16);
	}
	ino = parsed[0];
	mode = parsed[1];
	uid = parsed[2];
	gid = parsed[3];
	nlink = parsed[4];
	body_len = parsed[6];
	major = parsed[7];
	minor = parsed[8];
	rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
	name_len = parsed[11];
	}

	/* FSM */

	static __initdata enum state {
	Start,
	Collect,
	GotHeader,
	SkipIt,
	GotName,
	CopyFile,
	GotSymlink,
	Reset
	} state, next_state;

	static __initdata char *victim;
	static __initdata unsigned count;
	static __initdata loff_t this_header, next_header;

	static __initdata int dry_run;

	static inline void __init eat(unsigned n)
	{
	victim += n;
	this_header += n;
	count -= n;
	}

	static __initdata char *collected;
	static __initdata int remains;
	static __initdata char *collect;

	static void __init read_into(char *buf, unsigned size, enum state next)
	{
	if (count >= size) {
	collected = victim;
	eat(size);
	state = next;
	} else {
	collect = collected = buf;
	remains = size;
	next_state = next;
	state = Collect;
	}
	}

	static __initdata char header_buf, symlink_buf, *name_buf;

	static int __init do_start(void)
	{
	read_into(header_buf, 110, GotHeader);
	return 0;
	}

	static int __init do_collect(void)
	{
	unsigned n = remains;
	if (count < n)
	n = count;
	memcpy(collect, victim, n);
	eat(n);
	collect += n;
	if ((remains -= n) != 0)
	return 1;
	state = next_state;
	return 0;
	}

	static int __init do_header(void)
	{
	if (memcmp(collected, "070707", 6)==0) {
	error("incorrect cpio method used: use -H newc option");
	return 1;
	}
	if (memcmp(collected, "070701", 6)) {
	error("no cpio magic");
	return 1;
	}
	parse_header(collected);
	next_header = this_header + N_ALIGN(name_len) + body_len;
	next_header = (next_header + 3) & ~3;
	if (dry_run) {
	read_into(name_buf, N_ALIGN(name_len), GotName);
	return 0;
	}
	state = SkipIt;
	if (name_len <= 0 \|\| name_len > PATH_MAX)
	return 0;
	if (S_ISLNK(mode)) {
	if (body_len > PATH_MAX)
	return 0;
	collect = collected = symlink_buf;
	remains = N_ALIGN(name_len) + body_len;
	next_state = GotSymlink;
	state = Collect;
	return 0;
	}
	if (S_ISREG(mode) \|\| !body_len)
	read_into(name_buf, N_ALIGN(name_len), GotName);
	return 0;
	}

	static int __init do_skip(void)
	{
	if (this_header + count < next_header) {
	eat(count);
	return 1;
	} else {
	eat(next_header - this_header);
	state = next_state;
	return 0;
	}
	}

	static int __init do_reset(void)
	{
	while(count && *victim == '\0')
	eat(1);
	if (count && (this_header & 3))
	error("broken padding");
	return 1;
	}

	static int __init maybe_link(void)
	{
	if (nlink >= 2) {
	char *old = find_link(major, minor, ino, mode, collected);
	if (old)
	return (sys_link(old, collected) < 0) ? -1 : 1;
	}
	return 0;
	}

	static void __init clean_path(char *path, mode_t mode)
	{
	struct stat st;

	if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
	if (S_ISDIR(st.st_mode))
	sys_rmdir(path);
	else
	sys_unlink(path);
	}
	}

	static __initdata int wfd;

	static int __init do_name(void)
	{
	state = SkipIt;
	next_state = Reset;
	if (strcmp(collected, "TRAILER!!!") == 0) {
	free_hash();
	return 0;
	}
	if (dry_run)
	return 0;
	clean_path(collected, mode);
	if (S_ISREG(mode)) {
	int ml = maybe_link();
	if (ml >= 0) {
	int openflags = O_WRONLY\|O_CREAT;
	if (ml != 1)
	openflags \|= O_TRUNC;
	wfd = sys_open(collected, openflags, mode);

	if (wfd >= 0) {
	sys_fchown(wfd, uid, gid);
	sys_fchmod(wfd, mode);
	state = CopyFile;
	}
	}
	} else if (S_ISDIR(mode)) {
	sys_mkdir(collected, mode);
	sys_chown(collected, uid, gid);
	sys_chmod(collected, mode);
	} else if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\|
	S_ISFIFO(mode) \|\| S_ISSOCK(mode)) {
	if (maybe_link() == 0) {
	sys_mknod(collected, mode, rdev);
	sys_chown(collected, uid, gid);
	sys_chmod(collected, mode);
	}
	}
	return 0;
	}

	static int __init do_copy(void)
	{
	if (count >= body_len) {
	sys_write(wfd, victim, body_len);
	sys_close(wfd);
	eat(body_len);
	state = SkipIt;
	return 0;
	} else {
	sys_write(wfd, victim, count);
	body_len -= count;
	eat(count);
	return 1;
	}
	}

	static int __init do_symlink(void)
	{
	collected[N_ALIGN(name_len) + body_len] = '\0';
	clean_path(collected, 0);
	sys_symlink(collected + N_ALIGN(name_len), collected);
	sys_lchown(collected, uid, gid);
	state = SkipIt;
	next_state = Reset;
	return 0;
	}

	static __initdata int (*actions[])(void) = {
	[Start] = do_start,
	[Collect] = do_collect,
	[GotHeader] = do_header,
	[SkipIt] = do_skip,
	[GotName] = do_name,
	[CopyFile] = do_copy,
	[GotSymlink] = do_symlink,
	[Reset] = do_reset,
	};

	static int __init write_buffer(char *buf, unsigned len)
	{
	count = len;
	victim = buf;

	while (!actions[state]())
	;
	return len - count;
	}

	static void __init flush_buffer(char *buf, unsigned len)
	{
	int written;
	if (message)
	return;
	while ((written = write_buffer(buf, len)) < len && !message) {
	char c = buf[written];
	if (c == '0') {
	buf += written;
	len -= written;
	state = Start;
	} else if (c == 0) {
	buf += written;
	len -= written;
	state = Reset;
	} else
	error("junk in compressed archive");
	}
	}

	/*
	* gzip declarations
	*/

	#define OF(args) args

	#ifndef memzero
	#define memzero(s, n) memset ((s), 0, (n))
	#endif

	typedef unsigned char uch;
	typedef unsigned short ush;
	typedef unsigned long ulg;

	#define WSIZE 0x8000 /* window size--must be a power of two, and */
	/* at least 32K for zip's deflate method */

	static uch *inbuf;
	static uch *window;

	static unsigned insize; /* valid bytes in inbuf */
	static unsigned inptr; /* index of next byte to be processed in inbuf */
	static unsigned outcnt; /* bytes in output buffer */
	static long bytes_out;

	#define get_byte() (inptr < insize ? inbuf[inptr++] : -1)

	/* Diagnostic functions (stubbed out) */
	#define Assert(cond,msg)
	#define Trace(x)
	#define Tracev(x)
	#define Tracevv(x)
	#define Tracec(c,x)
	#define Tracecv(c,x)

	#define STATIC static
	#define INIT __init

	static void __init flush_window(void);
	static void __init error(char *m);
	static void __init gzip_mark(void **);
	static void __init gzip_release(void **);

	#include "../lib/inflate.c"

	static void __init gzip_mark(void **ptr)
	{
	}

	static void __init gzip_release(void **ptr)
	{
	}

	/* ===========================================================================
	* Write the output window window[0..outcnt-1] and update crc and bytes_out.
	* (Used for the decompressed data only.)
	*/
	static void __init flush_window(void)
	{
	ulg c = crc; /* temporary variable */
	unsigned n;
	uch *in, ch;

	flush_buffer(window, outcnt);
	in = window;
	for (n = 0; n < outcnt; n++) {
	ch = *in++;
	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
	}
	crc = c;
	bytes_out += (ulg)outcnt;
	outcnt = 0;
	}

	static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
	{
	int written;
	dry_run = check_only;
	header_buf = malloc(110);
	symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);
	name_buf = malloc(N_ALIGN(PATH_MAX));
	window = malloc(WSIZE);
	if (!window \|\| !header_buf \|\| !symlink_buf \|\| !name_buf)
	panic("can't allocate buffers");
	state = Start;
	this_header = 0;
	message = NULL;
	while (!message && len) {
	loff_t saved_offset = this_header;
	if (*buf == '0' && !(this_header & 3)) {
	state = Start;
	written = write_buffer(buf, len);
	buf += written;
	len -= written;
	continue;
	}
	if (!*buf) {
	buf++;
	len--;
	this_header++;
	continue;
	}
	this_header = 0;
	insize = len;
	inbuf = buf;
	inptr = 0;
	outcnt = 0; /* bytes in output buffer */
	bytes_out = 0;
	crc = (ulg)0xffffffffL; /* shift register contents */
	makecrc();
	gunzip();
	if (state != Reset)
	error("junk in gzipped archive");
	this_header = saved_offset + inptr;
	buf += inptr;
	len -= inptr;
	}
	free(window);
	free(name_buf);
	free(symlink_buf);
	free(header_buf);
	return message;
	}

	static int __initdata do_retain_initrd;

	static int __init retain_initrd_param(char *str)
	{
	if (*str)
	return 0;
	do_retain_initrd = 1;
	return 1;
	}
	__setup("retain_initrd", retain_initrd_param);

	extern char __initramfs_start[], __initramfs_end[];
	#ifdef CONFIG_BLK_DEV_INITRD
	#include <linux/initrd.h>
	#include <linux/kexec.h>

	static void __init free_initrd(void)
	{
	#ifdef CONFIG_KEXEC
	unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
	unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
	#endif
	if (do_retain_initrd)
	goto skip;

	#ifdef CONFIG_KEXEC
	/*
	* If the initrd region is overlapped with crashkernel reserved region,
	* free only memory that is not part of crashkernel region.
	*/
	if (initrd_start < crashk_end && initrd_end > crashk_start) {
	/*
	* Initialize initrd memory region since the kexec boot does
	* not do.
	*/
	memset((void *)initrd_start, 0, initrd_end - initrd_start);
	if (initrd_start < crashk_start)
	free_initrd_mem(initrd_start, crashk_start);
	if (initrd_end > crashk_end)
	free_initrd_mem(crashk_end, initrd_end);
	} else
	#endif
	free_initrd_mem(initrd_start, initrd_end);
	skip:
	initrd_start = 0;
	initrd_end = 0;
	}

	#endif

	static int __init populate_rootfs(void)
	{
	char *err = unpack_to_rootfs(__initramfs_start,
	__initramfs_end - __initramfs_start, 0);
	if (err)
	panic(err);
	#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start) {
	#ifdef CONFIG_BLK_DEV_RAM
	int fd;
	printk(KERN_INFO "checking if image is initramfs...");
	err = unpack_to_rootfs((char *)initrd_start,
	initrd_end - initrd_start, 1);
	if (!err) {
	printk(" it is\n");
	unpack_to_rootfs((char *)initrd_start,
	initrd_end - initrd_start, 0);
	free_initrd();
	return 0;
	}
	printk("it isn't (%s); looks like an initrd\n", err);
	fd = sys_open("/initrd.image", O_WRONLY\|O_CREAT, 0700);
	if (fd >= 0) {
	sys_write(fd, (char *)initrd_start,
	initrd_end - initrd_start);
	sys_close(fd);
	free_initrd();
	}
	#else
	printk(KERN_INFO "Unpacking initramfs...");
	err = unpack_to_rootfs((char *)initrd_start,
	initrd_end - initrd_start, 0);
	if (err)
	panic(err);
	printk(" done\n");
	free_initrd();
	#endif
	}
	#endif
	return 0;
	}
	rootfs_initcall(populate_rootfs);