[net-next-2.6.git] / init / initramfs.c

#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;
}

/* 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 = kmalloc(sizeof(struct hash), GFP_KERNEL);
	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;
			kfree(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);

#define NO_INFLATE_MALLOC

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

/* ===========================================================================
 * 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 = kmalloc(110, GFP_KERNEL);
	symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
	name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
	window = kmalloc(WSIZE, GFP_KERNEL);
	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;
	}
	kfree(window);
	kfree(name_buf);
	kfree(symlink_buf);
	kfree(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[];
#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;
}

static int __init populate_rootfs(void)
{
	char *err = unpack_to_rootfs(__initramfs_start,
			 __initramfs_end - __initramfs_start, 0);
	if (err)
		panic(err);
	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
	}
	return 0;
}
rootfs_initcall(populate_rootfs);
Commit	Line	Data
1da177e4 LT	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
1da177e4 LT	17	/* link hash */
1da177e4 LT	18
6a050da4 MH	19	#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
6a050da4 MH	20
1da177e4 LT	21	static __initdata struct hash {
1da177e4 LT	22	int ino, minor, major;
2139a7fb	23	mode_t mode;
1da177e4	24	struct hash *next;
6a050da4	25	char name[N_ALIGN(PATH_MAX)];
1da177e4 LT	26	} *head[32];
	27
	28	static inline int hash(int major, int minor, int ino)
	29	{
	30	unsigned long tmp = ino + minor + (major << 3);
	31	tmp += tmp >> 5;
	32	return tmp & 31;
	33	}
	34
2139a7fb PA	35	static char __init *find_link(int major, int minor, int ino,
2139a7fb PA	36	mode_t mode, char *name)
1da177e4 LT	37	{
	38	struct hash *p, q;
	39	for (p = head + hash(major, minor, ino); p; p = &(p)->next) {
	40	if ((*p)->ino != ino)
	41	continue;
	42	if ((*p)->minor != minor)
	43	continue;
	44	if ((*p)->major != major)
	45	continue;
2139a7fb PA	46	if (((*p)->mode ^ mode) & S_IFMT)
2139a7fb PA	47	continue;
1da177e4 LT	48	return (*p)->name;
1da177e4 LT	49	}
3265e66b	50	q = kmalloc(sizeof(struct hash), GFP_KERNEL);
1da177e4 LT	51	if (!q)
1da177e4 LT	52	panic("can't allocate link hash entry");
1da177e4	53	q->major = major;
2139a7fb PA	54	q->minor = minor;
	55	q->ino = ino;
	56	q->mode = mode;
6a050da4	57	strcpy(q->name, name);
1da177e4 LT	58	q->next = NULL;
	59	*p = q;
	60	return NULL;
	61	}
	62
	63	static void __init free_hash(void)
	64	{
	65	struct hash *p, q;
	66	for (p = head; p < head + 32; p++) {
	67	while (*p) {
	68	q = *p;
	69	*p = q->next;
3265e66b	70	kfree(q);
1da177e4 LT	71	}
	72	}
	73	}
	74
	75	/* cpio header parsing */
	76
	77	static __initdata unsigned long ino, major, minor, nlink;
	78	static __initdata mode_t mode;
	79	static __initdata unsigned long body_len, name_len;
	80	static __initdata uid_t uid;
	81	static __initdata gid_t gid;
	82	static __initdata unsigned rdev;
	83
	84	static void __init parse_header(char *s)
	85	{
	86	unsigned long parsed[12];
	87	char buf[9];
	88	int i;
	89
	90	buf[8] = '\0';
	91	for (i = 0, s += 6; i < 12; i++, s += 8) {
	92	memcpy(buf, s, 8);
	93	parsed[i] = simple_strtoul(buf, NULL, 16);
	94	}
	95	ino = parsed[0];
	96	mode = parsed[1];
	97	uid = parsed[2];
	98	gid = parsed[3];
	99	nlink = parsed[4];
	100	body_len = parsed[6];
	101	major = parsed[7];
	102	minor = parsed[8];
	103	rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
	104	name_len = parsed[11];
	105	}
	106
	107	/* FSM */
	108
	109	static __initdata enum state {
	110	Start,
	111	Collect,
	112	GotHeader,
	113	SkipIt,
	114	GotName,
	115	CopyFile,
	116	GotSymlink,
	117	Reset
	118	} state, next_state;
	119
	120	static __initdata char *victim;
	121	static __initdata unsigned count;
	122	static __initdata loff_t this_header, next_header;
	123
	124	static __initdata int dry_run;
	125
b0a5ab93	126	static inline void __init eat(unsigned n)
1da177e4 LT	127	{
	128	victim += n;
	129	this_header += n;
	130	count -= n;
	131	}
	132
1da177e4 LT	133	static __initdata char *collected;
	134	static __initdata int remains;
	135	static __initdata char *collect;
	136
	137	static void __init read_into(char *buf, unsigned size, enum state next)
	138	{
	139	if (count >= size) {
	140	collected = victim;
	141	eat(size);
	142	state = next;
	143	} else {
	144	collect = collected = buf;
	145	remains = size;
	146	next_state = next;
	147	state = Collect;
	148	}
	149	}
	150
	151	static __initdata char header_buf, symlink_buf, *name_buf;
	152
	153	static int __init do_start(void)
	154	{
	155	read_into(header_buf, 110, GotHeader);
	156	return 0;
	157	}
	158
	159	static int __init do_collect(void)
	160	{
	161	unsigned n = remains;
	162	if (count < n)
	163	n = count;
	164	memcpy(collect, victim, n);
	165	eat(n);
	166	collect += n;
	167	if ((remains -= n) != 0)
	168	return 1;
	169	state = next_state;
	170	return 0;
	171	}
	172
	173	static int __init do_header(void)
	174	{
2e591bbc AV	175	if (memcmp(collected, "070707", 6)==0) {
	176	error("incorrect cpio method used: use -H newc option");
	177	return 1;
	178	}
1da177e4 LT	179	if (memcmp(collected, "070701", 6)) {
	180	error("no cpio magic");
	181	return 1;
	182	}
	183	parse_header(collected);
	184	next_header = this_header + N_ALIGN(name_len) + body_len;
	185	next_header = (next_header + 3) & ~3;
	186	if (dry_run) {
	187	read_into(name_buf, N_ALIGN(name_len), GotName);
	188	return 0;
	189	}
	190	state = SkipIt;
	191	if (name_len <= 0 \|\| name_len > PATH_MAX)
	192	return 0;
	193	if (S_ISLNK(mode)) {
	194	if (body_len > PATH_MAX)
	195	return 0;
	196	collect = collected = symlink_buf;
	197	remains = N_ALIGN(name_len) + body_len;
	198	next_state = GotSymlink;
	199	state = Collect;
	200	return 0;
	201	}
	202	if (S_ISREG(mode) \|\| !body_len)
	203	read_into(name_buf, N_ALIGN(name_len), GotName);
	204	return 0;
	205	}
	206
	207	static int __init do_skip(void)
	208	{
	209	if (this_header + count < next_header) {
	210	eat(count);
	211	return 1;
	212	} else {
	213	eat(next_header - this_header);
	214	state = next_state;
	215	return 0;
	216	}
	217	}
	218
	219	static int __init do_reset(void)
	220	{
	221	while(count && *victim == '\0')
	222	eat(1);
	223	if (count && (this_header & 3))
	224	error("broken padding");
	225	return 1;
	226	}
	227
	228	static int __init maybe_link(void)
	229	{
	230	if (nlink >= 2) {
2139a7fb	231	char *old = find_link(major, minor, ino, mode, collected);
1da177e4 LT	232	if (old)
	233	return (sys_link(old, collected) < 0) ? -1 : 1;
	234	}
	235	return 0;
	236	}
	237
2139a7fb PA	238	static void __init clean_path(char *path, mode_t mode)
	239	{
	240	struct stat st;
	241
	242	if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
	243	if (S_ISDIR(st.st_mode))
	244	sys_rmdir(path);
	245	else
	246	sys_unlink(path);
	247	}
	248	}
	249
1da177e4 LT	250	static __initdata int wfd;
	251
	252	static int __init do_name(void)
	253	{
	254	state = SkipIt;
	255	next_state = Reset;
	256	if (strcmp(collected, "TRAILER!!!") == 0) {
	257	free_hash();
	258	return 0;
	259	}
	260	if (dry_run)
	261	return 0;
2139a7fb	262	clean_path(collected, mode);
1da177e4	263	if (S_ISREG(mode)) {
2139a7fb PA	264	int ml = maybe_link();
	265	if (ml >= 0) {
	266	int openflags = O_WRONLY\|O_CREAT;
	267	if (ml != 1)
	268	openflags \|= O_TRUNC;
	269	wfd = sys_open(collected, openflags, mode);
	270
1da177e4 LT	271	if (wfd >= 0) {
	272	sys_fchown(wfd, uid, gid);
	273	sys_fchmod(wfd, mode);
	274	state = CopyFile;
	275	}
	276	}
	277	} else if (S_ISDIR(mode)) {
	278	sys_mkdir(collected, mode);
	279	sys_chown(collected, uid, gid);
	280	sys_chmod(collected, mode);
	281	} else if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\|
	282	S_ISFIFO(mode) \|\| S_ISSOCK(mode)) {
	283	if (maybe_link() == 0) {
	284	sys_mknod(collected, mode, rdev);
	285	sys_chown(collected, uid, gid);
	286	sys_chmod(collected, mode);
	287	}
	288	}
	289	return 0;
	290	}
	291
	292	static int __init do_copy(void)
	293	{
	294	if (count >= body_len) {
	295	sys_write(wfd, victim, body_len);
	296	sys_close(wfd);
	297	eat(body_len);
	298	state = SkipIt;
	299	return 0;
	300	} else {
	301	sys_write(wfd, victim, count);
	302	body_len -= count;
	303	eat(count);
	304	return 1;
	305	}
	306	}
	307
	308	static int __init do_symlink(void)
	309	{
	310	collected[N_ALIGN(name_len) + body_len] = '\0';
2139a7fb	311	clean_path(collected, 0);
1da177e4 LT	312	sys_symlink(collected + N_ALIGN(name_len), collected);
	313	sys_lchown(collected, uid, gid);
	314	state = SkipIt;
	315	next_state = Reset;
	316	return 0;
	317	}
	318
	319	static __initdata int (*actions[])(void) = {
	320	[Start] = do_start,
	321	[Collect] = do_collect,
	322	[GotHeader] = do_header,
	323	[SkipIt] = do_skip,
	324	[GotName] = do_name,
	325	[CopyFile] = do_copy,
	326	[GotSymlink] = do_symlink,
	327	[Reset] = do_reset,
	328	};
	329
	330	static int __init write_buffer(char *buf, unsigned len)
	331	{
	332	count = len;
	333	victim = buf;
	334
	335	while (!actions[state]())
	336	;
	337	return len - count;
	338	}
	339
	340	static void __init flush_buffer(char *buf, unsigned len)
	341	{
	342	int written;
	343	if (message)
	344	return;
	345	while ((written = write_buffer(buf, len)) < len && !message) {
	346	char c = buf[written];
	347	if (c == '0') {
	348	buf += written;
	349	len -= written;
	350	state = Start;
	351	} else if (c == 0) {
	352	buf += written;
	353	len -= written;
	354	state = Reset;
	355	} else
	356	error("junk in compressed archive");
	357	}
	358	}
	359
	360	/*
	361	* gzip declarations
	362	*/
	363
	364	#define OF(args) args
	365
	366	#ifndef memzero
	367	#define memzero(s, n) memset ((s), 0, (n))
	368	#endif
	369
	370	typedef unsigned char uch;
	371	typedef unsigned short ush;
	372	typedef unsigned long ulg;
	373
	374	#define WSIZE 0x8000 /* window size--must be a power of two, and */
	375	/* at least 32K for zip's deflate method */
376
377	static uch *inbuf;
378	static uch *window;
379
380	static unsigned insize; /* valid bytes in inbuf */
381	static unsigned inptr; /* index of next byte to be processed in inbuf */
382	static unsigned outcnt; /* bytes in output buffer */
383	static long bytes_out;
384
385	#define get_byte() (inptr < insize ? inbuf[inptr++] : -1)
386
387	/* Diagnostic functions (stubbed out) */
388	#define Assert(cond,msg)
389	#define Trace(x)
390	#define Tracev(x)
391	#define Tracevv(x)
392	#define Tracec(c,x)
393	#define Tracecv(c,x)
394
395	#define STATIC static
396	#define INIT __init
397
398	static void __init flush_window(void);
399	static void __init error(char *m);
1da177e4	400
2d6ffcca	401	#define NO_INFLATE_MALLOC
1da177e4	402
2d6ffcca	403	#include "../lib/inflate.c"
1da177e4 LT	404
	405	/* ===========================================================================
	406	* Write the output window window[0..outcnt-1] and update crc and bytes_out.
	407	* (Used for the decompressed data only.)
	408	*/
	409	static void __init flush_window(void)
	410	{
	411	ulg c = crc; /* temporary variable */
	412	unsigned n;
	413	uch *in, ch;
	414
	415	flush_buffer(window, outcnt);
	416	in = window;
	417	for (n = 0; n < outcnt; n++) {
	418	ch = *in++;
	419	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
	420	}
	421	crc = c;
	422	bytes_out += (ulg)outcnt;
	423	outcnt = 0;
	424	}
	425
	426	static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
	427	{
	428	int written;
	429	dry_run = check_only;
3265e66b TP	430	header_buf = kmalloc(110, GFP_KERNEL);
	431	symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
	432	name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
	433	window = kmalloc(WSIZE, GFP_KERNEL);
1da177e4 LT	434	if (!window \|\| !header_buf \|\| !symlink_buf \|\| !name_buf)
	435	panic("can't allocate buffers");
	436	state = Start;
	437	this_header = 0;
	438	message = NULL;
	439	while (!message && len) {
	440	loff_t saved_offset = this_header;
	441	if (*buf == '0' && !(this_header & 3)) {
	442	state = Start;
	443	written = write_buffer(buf, len);
	444	buf += written;
	445	len -= written;
	446	continue;
	447	}
	448	if (!*buf) {
	449	buf++;
	450	len--;
	451	this_header++;
	452	continue;
	453	}
	454	this_header = 0;
	455	insize = len;
	456	inbuf = buf;
	457	inptr = 0;
	458	outcnt = 0; /* bytes in output buffer */
	459	bytes_out = 0;
	460	crc = (ulg)0xffffffffL; /* shift register contents */
	461	makecrc();
	462	gunzip();
	463	if (state != Reset)
	464	error("junk in gzipped archive");
	465	this_header = saved_offset + inptr;
	466	buf += inptr;
	467	len -= inptr;
	468	}
3265e66b TP	469	kfree(window);
	470	kfree(name_buf);
	471	kfree(symlink_buf);
	472	kfree(header_buf);
1da177e4 LT	473	return message;
	474	}
	475
0a7b35cb MN	476	static int __initdata do_retain_initrd;
	477
	478	static int __init retain_initrd_param(char *str)
	479	{
	480	if (*str)
	481	return 0;
	482	do_retain_initrd = 1;
	483	return 1;
	484	}
	485	__setup("retain_initrd", retain_initrd_param);
	486
1da177e4	487	extern char __initramfs_start[], __initramfs_end[];
1da177e4	488	#include <linux/initrd.h>
9c15e852	489	#include <linux/kexec.h>
0f3d2bd5 JB	490
	491	static void __init free_initrd(void)
	492	{
9c15e852 HM	493	#ifdef CONFIG_KEXEC
	494	unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
	495	unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
0a7b35cb MN	496	#endif
	497	if (do_retain_initrd)
	498	goto skip;
9c15e852	499
0a7b35cb	500	#ifdef CONFIG_KEXEC
9c15e852 HM	501	/*
	502	* If the initrd region is overlapped with crashkernel reserved region,
	503	* free only memory that is not part of crashkernel region.
	504	*/
	505	if (initrd_start < crashk_end && initrd_end > crashk_start) {
	506	/*
	507	* Initialize initrd memory region since the kexec boot does
	508	* not do.
	509	*/
	510	memset((void *)initrd_start, 0, initrd_end - initrd_start);
	511	if (initrd_start < crashk_start)
	512	free_initrd_mem(initrd_start, crashk_start);
	513	if (initrd_end > crashk_end)
	514	free_initrd_mem(crashk_end, initrd_end);
	515	} else
	516	#endif
	517	free_initrd_mem(initrd_start, initrd_end);
0a7b35cb	518	skip:
0f3d2bd5 JB	519	initrd_start = 0;
	520	initrd_end = 0;
	521	}
	522
9a9e0d68	523	static int __init populate_rootfs(void)
1da177e4 LT	524	{
	525	char *err = unpack_to_rootfs(__initramfs_start,
	526	__initramfs_end - __initramfs_start, 0);
	527	if (err)
	528	panic(err);
1da177e4	529	if (initrd_start) {
340e48e6	530	#ifdef CONFIG_BLK_DEV_RAM
1da177e4 LT	531	int fd;
	532	printk(KERN_INFO "checking if image is initramfs...");
	533	err = unpack_to_rootfs((char *)initrd_start,
	534	initrd_end - initrd_start, 1);
	535	if (!err) {
	536	printk(" it is\n");
	537	unpack_to_rootfs((char *)initrd_start,
	538	initrd_end - initrd_start, 0);
0f3d2bd5	539	free_initrd();
8d610dd5	540	return 0;
1da177e4 LT	541	}
1da177e4 LT	542	printk("it isn't (%s); looks like an initrd\n", err);
33644c5e	543	fd = sys_open("/initrd.image", O_WRONLY\|O_CREAT, 0700);
1da177e4 LT	544	if (fd >= 0) {
	545	sys_write(fd, (char *)initrd_start,
	546	initrd_end - initrd_start);
	547	sys_close(fd);
0f3d2bd5	548	free_initrd();
1da177e4	549	}
340e48e6 ZP	550	#else
	551	printk(KERN_INFO "Unpacking initramfs...");
	552	err = unpack_to_rootfs((char *)initrd_start,
	553	initrd_end - initrd_start, 0);
	554	if (err)
	555	panic(err);
	556	printk(" done\n");
	557	free_initrd();
	558	#endif
1da177e4	559	}
8d610dd5	560	return 0;
1da177e4	561	}
8d610dd5	562	rootfs_initcall(populate_rootfs);