[linux.git] / init / do_mounts_rd.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/ext2_fs.h>
#include <linux/romfs_fs.h>
#include <uapi/linux/cramfs_fs.h>
#include <linux/initrd.h>
#include <linux/string.h>
#include <linux/slab.h>

#include "do_mounts.h"
#include "../fs/squashfs/squashfs_fs.h"

#include <linux/decompress/generic.h>


int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */

static int __init prompt_ramdisk(char *str)
{
	rd_prompt = simple_strtol(str,NULL,0) & 1;
	return 1;
}
__setup("prompt_ramdisk=", prompt_ramdisk);

int __initdata rd_image_start;		/* starting block # of image */

static int __init ramdisk_start_setup(char *str)
{
	rd_image_start = simple_strtol(str,NULL,0);
	return 1;
}
__setup("ramdisk_start=", ramdisk_start_setup);

static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);

/*
 * This routine tries to find a RAM disk image to load, and returns the
 * number of blocks to read for a non-compressed image, 0 if the image
 * is a compressed image, and -1 if an image with the right magic
 * numbers could not be found.
 *
 * We currently check for the following magic numbers:
 *	minix
 *	ext2
 *	romfs
 *	cramfs
 *	squashfs
 *	gzip
 *	bzip2
 *	lzma
 *	xz
 *	lzo
 *	lz4
 */
static int __init
identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
{
	const int size = 512;
	struct minix_super_block *minixsb;
	struct romfs_super_block *romfsb;
	struct cramfs_super *cramfsb;
	struct squashfs_super_block *squashfsb;
	int nblocks = -1;
	unsigned char *buf;
	const char *compress_name;
	unsigned long n;

	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	minixsb = (struct minix_super_block *) buf;
	romfsb = (struct romfs_super_block *) buf;
	cramfsb = (struct cramfs_super *) buf;
	squashfsb = (struct squashfs_super_block *) buf;
	memset(buf, 0xe5, size);

	/*
	 * Read block 0 to test for compressed kernel
	 */
	ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
	ksys_read(fd, buf, size);

	*decompressor = decompress_method(buf, size, &compress_name);
	if (compress_name) {
		printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
		       compress_name, start_block);
		if (!*decompressor)
			printk(KERN_EMERG
			       "RAMDISK: %s decompressor not configured!\n",
			       compress_name);
		nblocks = 0;
		goto done;
	}

	/* romfs is at block zero too */
	if (romfsb->word0 == ROMSB_WORD0 &&
	    romfsb->word1 == ROMSB_WORD1) {
		printk(KERN_NOTICE
		       "RAMDISK: romfs filesystem found at block %d\n",
		       start_block);
		nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
		goto done;
	}

	if (cramfsb->magic == CRAMFS_MAGIC) {
		printk(KERN_NOTICE
		       "RAMDISK: cramfs filesystem found at block %d\n",
		       start_block);
		nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
		goto done;
	}

	/* squashfs is at block zero too */
	if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
		printk(KERN_NOTICE
		       "RAMDISK: squashfs filesystem found at block %d\n",
		       start_block);
		nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
			 >> BLOCK_SIZE_BITS;
		goto done;
	}

	/*
	 * Read 512 bytes further to check if cramfs is padded
	 */
	ksys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
	ksys_read(fd, buf, size);

	if (cramfsb->magic == CRAMFS_MAGIC) {
		printk(KERN_NOTICE
		       "RAMDISK: cramfs filesystem found at block %d\n",
		       start_block);
		nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
		goto done;
	}

	/*
	 * Read block 1 to test for minix and ext2 superblock
	 */
	ksys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
	ksys_read(fd, buf, size);

	/* Try minix */
	if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
	    minixsb->s_magic == MINIX_SUPER_MAGIC2) {
		printk(KERN_NOTICE
		       "RAMDISK: Minix filesystem found at block %d\n",
		       start_block);
		nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
		goto done;
	}

	/* Try ext2 */
	n = ext2_image_size(buf);
	if (n) {
		printk(KERN_NOTICE
		       "RAMDISK: ext2 filesystem found at block %d\n",
		       start_block);
		nblocks = n;
		goto done;
	}

	printk(KERN_NOTICE
	       "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
	       start_block);

done:
	ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
	kfree(buf);
	return nblocks;
}

int __init rd_load_image(char *from)
{
	int res = 0;
	int in_fd, out_fd;
	unsigned long rd_blocks, devblocks;
	int nblocks, i, disk;
	char *buf = NULL;
	unsigned short rotate = 0;
	decompress_fn decompressor = NULL;
#if !defined(CONFIG_S390)
	char rotator[4] = { '|' , '/' , '-' , '\\' };
#endif

	out_fd = ksys_open("/dev/ram", O_RDWR, 0);
	if (out_fd < 0)
		goto out;

	in_fd = ksys_open(from, O_RDONLY, 0);
	if (in_fd < 0)
		goto noclose_input;

	nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
	if (nblocks < 0)
		goto done;

	if (nblocks == 0) {
		if (crd_load(in_fd, out_fd, decompressor) == 0)
			goto successful_load;
		goto done;
	}

	/*
	 * NOTE NOTE: nblocks is not actually blocks but
	 * the number of kibibytes of data to load into a ramdisk.
	 */
	if (ksys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
		rd_blocks = 0;
	else
		rd_blocks >>= 1;

	if (nblocks > rd_blocks) {
		printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
		       nblocks, rd_blocks);
		goto done;
	}

	/*
	 * OK, time to copy in the data
	 */
	if (ksys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
		devblocks = 0;
	else
		devblocks >>= 1;

	if (strcmp(from, "/initrd.image") == 0)
		devblocks = nblocks;

	if (devblocks == 0) {
		printk(KERN_ERR "RAMDISK: could not determine device size\n");
		goto done;
	}

	buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
	if (!buf) {
		printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
		goto done;
	}

	printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
		nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
	for (i = 0, disk = 1; i < nblocks; i++) {
		if (i && (i % devblocks == 0)) {
			pr_cont("done disk #%d.\n", disk++);
			rotate = 0;
			if (ksys_close(in_fd)) {
				printk("Error closing the disk.\n");
				goto noclose_input;
			}
			change_floppy("disk #%d", disk);
			in_fd = ksys_open(from, O_RDONLY, 0);
			if (in_fd < 0)  {
				printk("Error opening disk.\n");
				goto noclose_input;
			}
			printk("Loading disk #%d... ", disk);
		}
		ksys_read(in_fd, buf, BLOCK_SIZE);
		ksys_write(out_fd, buf, BLOCK_SIZE);
#if !defined(CONFIG_S390)
		if (!(i % 16)) {
			pr_cont("%c\b", rotator[rotate & 0x3]);
			rotate++;
		}
#endif
	}
	pr_cont("done.\n");

successful_load:
	res = 1;
done:
	ksys_close(in_fd);
noclose_input:
	ksys_close(out_fd);
out:
	kfree(buf);
	ksys_unlink("/dev/ram");
	return res;
}

int __init rd_load_disk(int n)
{
	if (rd_prompt)
		change_floppy("root floppy disk to be loaded into RAM disk");
	create_dev("/dev/root", ROOT_DEV);
	create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
	return rd_load_image("/dev/root");
}

static int exit_code;
static int decompress_error;
static int crd_infd, crd_outfd;

static long __init compr_fill(void *buf, unsigned long len)
{
	long r = ksys_read(crd_infd, buf, len);
	if (r < 0)
		printk(KERN_ERR "RAMDISK: error while reading compressed data");
	else if (r == 0)
		printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
	return r;
}

static long __init compr_flush(void *window, unsigned long outcnt)
{
	long written = ksys_write(crd_outfd, window, outcnt);
	if (written != outcnt) {
		if (decompress_error == 0)
			printk(KERN_ERR
			       "RAMDISK: incomplete write (%ld != %ld)\n",
			       written, outcnt);
		decompress_error = 1;
		return -1;
	}
	return outcnt;
}

static void __init error(char *x)
{
	printk(KERN_ERR "%s\n", x);
	exit_code = 1;
	decompress_error = 1;
}

static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
{
	int result;
	crd_infd = in_fd;
	crd_outfd = out_fd;

	if (!deco) {
		pr_emerg("Invalid ramdisk decompression routine.  "
			 "Select appropriate config option.\n");
		panic("Could not decompress initial ramdisk image.");
	}

	result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
	if (decompress_error)
		result = 1;
	return result;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	#include <linux/kernel.h>
	3	#include <linux/fs.h>
	4	#include <linux/minix_fs.h>
	5	#include <linux/ext2_fs.h>
	6	#include <linux/romfs_fs.h>
f7f4f4dd	7	#include <uapi/linux/cramfs_fs.h>
1da177e4 LT	8	#include <linux/initrd.h>
1da177e4 LT	9	#include <linux/string.h>
5a0e3ad6	10	#include <linux/slab.h>
1da177e4 LT	11
1da177e4 LT	12	#include "do_mounts.h"
b8fed87d	13	#include "../fs/squashfs/squashfs_fs.h"
1da177e4	14
30d65dbf AK	15	#include <linux/decompress/generic.h>
30d65dbf AK	16
30d65dbf	17
1da177e4 LT	18	int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
	19
	20	static int __init prompt_ramdisk(char *str)
	21	{
	22	rd_prompt = simple_strtol(str,NULL,0) & 1;
	23	return 1;
	24	}
	25	__setup("prompt_ramdisk=", prompt_ramdisk);
	26
	27	int __initdata rd_image_start; /* starting block # of image */
	28
	29	static int __init ramdisk_start_setup(char *str)
	30	{
	31	rd_image_start = simple_strtol(str,NULL,0);
	32	return 1;
	33	}
	34	__setup("ramdisk_start=", ramdisk_start_setup);
	35
30d65dbf	36	static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
1da177e4 LT	37
	38	/*
	39	* This routine tries to find a RAM disk image to load, and returns the
	40	* number of blocks to read for a non-compressed image, 0 if the image
	41	* is a compressed image, and -1 if an image with the right magic
	42	* numbers could not be found.
	43	*
	44	* We currently check for the following magic numbers:
b172fd88 PA	45	* minix
b172fd88 PA	46	* ext2
1da177e4 LT	47	* romfs
1da177e4 LT	48	* cramfs
b8fed87d	49	* squashfs
b172fd88	50	* gzip
1bf49dd4	51	* bzip2
	52	* lzma
	53	* xz
	54	* lzo
	55	* lz4
1da177e4	56	*/
b172fd88	57	static int __init
30d65dbf	58	identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
1da177e4 LT	59	{
	60	const int size = 512;
	61	struct minix_super_block *minixsb;
1da177e4 LT	62	struct romfs_super_block *romfsb;
1da177e4 LT	63	struct cramfs_super *cramfsb;
b8fed87d	64	struct squashfs_super_block *squashfsb;
1da177e4 LT	65	int nblocks = -1;
1da177e4 LT	66	unsigned char *buf;
889c92d2	67	const char *compress_name;
39429c5e	68	unsigned long n;
1da177e4 LT	69
1da177e4 LT	70	buf = kmalloc(size, GFP_KERNEL);
c80544dc	71	if (!buf)
ea611b26	72	return -ENOMEM;
1da177e4 LT	73
1da177e4 LT	74	minixsb = (struct minix_super_block *) buf;
1da177e4 LT	75	romfsb = (struct romfs_super_block *) buf;
1da177e4 LT	76	cramfsb = (struct cramfs_super *) buf;
b8fed87d	77	squashfsb = (struct squashfs_super_block *) buf;
1da177e4 LT	78	memset(buf, 0xe5, size);
	79
	80	/*
b172fd88	81	* Read block 0 to test for compressed kernel
1da177e4	82	*/
76847e43	83	ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
3ce4a7bf	84	ksys_read(fd, buf, size);
1da177e4	85
889c92d2	86	*decompressor = decompress_method(buf, size, &compress_name);
23a22d57	87	if (compress_name) {
889c92d2 PA	88	printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
889c92d2 PA	89	compress_name, start_block);
23a22d57	90	if (!*decompressor)
73310a16 PA	91	printk(KERN_EMERG
73310a16 PA	92	"RAMDISK: %s decompressor not configured!\n",
23a22d57	93	compress_name);
889c92d2 PA	94	nblocks = 0;
889c92d2 PA	95	goto done;
1da177e4 LT	96	}
	97
	98	/* romfs is at block zero too */
	99	if (romfsb->word0 == ROMSB_WORD0 &&
	100	romfsb->word1 == ROMSB_WORD1) {
	101	printk(KERN_NOTICE
	102	"RAMDISK: romfs filesystem found at block %d\n",
	103	start_block);
	104	nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
	105	goto done;
	106	}
	107
	108	if (cramfsb->magic == CRAMFS_MAGIC) {
	109	printk(KERN_NOTICE
	110	"RAMDISK: cramfs filesystem found at block %d\n",
	111	start_block);
	112	nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
	113	goto done;
	114	}
	115
b8fed87d PL	116	/* squashfs is at block zero too */
	117	if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
	118	printk(KERN_NOTICE
	119	"RAMDISK: squashfs filesystem found at block %d\n",
	120	start_block);
	121	nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
	122	>> BLOCK_SIZE_BITS;
	123	goto done;
	124	}
	125
f919b923 NA	126	/*
	127	* Read 512 bytes further to check if cramfs is padded
	128	*/
76847e43	129	ksys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
3ce4a7bf	130	ksys_read(fd, buf, size);
f919b923 NA	131
	132	if (cramfsb->magic == CRAMFS_MAGIC) {
	133	printk(KERN_NOTICE
	134	"RAMDISK: cramfs filesystem found at block %d\n",
	135	start_block);
	136	nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
	137	goto done;
	138	}
	139
1da177e4 LT	140	/*
	141	* Read block 1 to test for minix and ext2 superblock
	142	*/
76847e43	143	ksys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
3ce4a7bf	144	ksys_read(fd, buf, size);
1da177e4 LT	145
	146	/* Try minix */
	147	if (minixsb->s_magic == MINIX_SUPER_MAGIC \|\|
	148	minixsb->s_magic == MINIX_SUPER_MAGIC2) {
	149	printk(KERN_NOTICE
	150	"RAMDISK: Minix filesystem found at block %d\n",
	151	start_block);
	152	nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
	153	goto done;
	154	}
	155
	156	/* Try ext2 */
39429c5e AV	157	n = ext2_image_size(buf);
39429c5e AV	158	if (n) {
1da177e4 LT	159	printk(KERN_NOTICE
	160	"RAMDISK: ext2 filesystem found at block %d\n",
	161	start_block);
39429c5e	162	nblocks = n;
1da177e4 LT	163	goto done;
	164	}
	165
	166	printk(KERN_NOTICE
	167	"RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
	168	start_block);
b172fd88	169
1da177e4	170	done:
76847e43	171	ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
1da177e4 LT	172	kfree(buf);
	173	return nblocks;
	174	}
	175
	176	int __init rd_load_image(char *from)
	177	{
	178	int res = 0;
	179	int in_fd, out_fd;
	180	unsigned long rd_blocks, devblocks;
	181	int nblocks, i, disk;
	182	char *buf = NULL;
	183	unsigned short rotate = 0;
30d65dbf	184	decompress_fn decompressor = NULL;
bc58450b	185	#if !defined(CONFIG_S390)
1da177e4 LT	186	char rotator[4] = { '\|' , '/' , '-' , '\\' };
	187	#endif
	188
bae217ea	189	out_fd = ksys_open("/dev/ram", O_RDWR, 0);
1da177e4 LT	190	if (out_fd < 0)
	191	goto out;
	192
bae217ea	193	in_fd = ksys_open(from, O_RDONLY, 0);
1da177e4 LT	194	if (in_fd < 0)
	195	goto noclose_input;
	196
30d65dbf	197	nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
1da177e4 LT	198	if (nblocks < 0)
	199	goto done;
	200
	201	if (nblocks == 0) {
30d65dbf	202	if (crd_load(in_fd, out_fd, decompressor) == 0)
1da177e4	203	goto successful_load;
1da177e4 LT	204	goto done;
	205	}
	206
	207	/*
	208	* NOTE NOTE: nblocks is not actually blocks but
	209	* the number of kibibytes of data to load into a ramdisk.
1da177e4	210	*/
cbb60b92	211	if (ksys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
1da177e4 LT	212	rd_blocks = 0;
	213	else
	214	rd_blocks >>= 1;
	215
	216	if (nblocks > rd_blocks) {
	217	printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
	218	nblocks, rd_blocks);
	219	goto done;
	220	}
b172fd88	221
1da177e4 LT	222	/*
	223	* OK, time to copy in the data
	224	*/
cbb60b92	225	if (ksys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
1da177e4 LT	226	devblocks = 0;
	227	else
	228	devblocks >>= 1;
	229
	230	if (strcmp(from, "/initrd.image") == 0)
	231	devblocks = nblocks;
	232
	233	if (devblocks == 0) {
	234	printk(KERN_ERR "RAMDISK: could not determine device size\n");
	235	goto done;
	236	}
	237
	238	buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
d613c3e2	239	if (!buf) {
1da177e4 LT	240	printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
	241	goto done;
	242	}
	243
	244	printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
	245	nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
	246	for (i = 0, disk = 1; i < nblocks; i++) {
	247	if (i && (i % devblocks == 0)) {
1a6a05a4	248	pr_cont("done disk #%d.\n", disk++);
1da177e4	249	rotate = 0;
2ca2a09d	250	if (ksys_close(in_fd)) {
1da177e4 LT	251	printk("Error closing the disk.\n");
	252	goto noclose_input;
	253	}
	254	change_floppy("disk #%d", disk);
bae217ea	255	in_fd = ksys_open(from, O_RDONLY, 0);
1da177e4 LT	256	if (in_fd < 0) {
	257	printk("Error opening disk.\n");
	258	goto noclose_input;
	259	}
	260	printk("Loading disk #%d... ", disk);
	261	}
3ce4a7bf	262	ksys_read(in_fd, buf, BLOCK_SIZE);
e7a3e8b2	263	ksys_write(out_fd, buf, BLOCK_SIZE);
bc58450b	264	#if !defined(CONFIG_S390)
1da177e4	265	if (!(i % 16)) {
18594e9b	266	pr_cont("%c\b", rotator[rotate & 0x3]);
1da177e4 LT	267	rotate++;
	268	}
	269	#endif
	270	}
1a6a05a4	271	pr_cont("done.\n");
1da177e4 LT	272
	273	successful_load:
	274	res = 1;
	275	done:
2ca2a09d	276	ksys_close(in_fd);
1da177e4	277	noclose_input:
2ca2a09d	278	ksys_close(out_fd);
1da177e4 LT	279	out:
1da177e4 LT	280	kfree(buf);
0f32ab8c	281	ksys_unlink("/dev/ram");
1da177e4 LT	282	return res;
	283	}
	284
	285	int __init rd_load_disk(int n)
	286	{
	287	if (rd_prompt)
	288	change_floppy("root floppy disk to be loaded into RAM disk");
bdaf8529 GKH	289	create_dev("/dev/root", ROOT_DEV);
bdaf8529 GKH	290	create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
1da177e4 LT	291	return rd_load_image("/dev/root");
	292	}
	293
1da177e4	294	static int exit_code;
30d65dbf	295	static int decompress_error;
1da177e4 LT	296	static int crd_infd, crd_outfd;
1da177e4 LT	297
d97b07c5	298	static long __init compr_fill(void *buf, unsigned long len)
1da177e4	299	{
3ce4a7bf	300	long r = ksys_read(crd_infd, buf, len);
30d65dbf AK	301	if (r < 0)
	302	printk(KERN_ERR "RAMDISK: error while reading compressed data");
	303	else if (r == 0)
	304	printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
	305	return r;
1da177e4 LT	306	}
1da177e4 LT	307
d97b07c5	308	static long __init compr_flush(void *window, unsigned long outcnt)
1da177e4	309	{
e7a3e8b2	310	long written = ksys_write(crd_outfd, window, outcnt);
30d65dbf AK	311	if (written != outcnt) {
	312	if (decompress_error == 0)
	313	printk(KERN_ERR
d97b07c5	314	"RAMDISK: incomplete write (%ld != %ld)\n",
30d65dbf AK	315	written, outcnt);
	316	decompress_error = 1;
	317	return -1;
	318	}
	319	return outcnt;
1da177e4 LT	320	}
	321
	322	static void __init error(char *x)
	323	{
	324	printk(KERN_ERR "%s\n", x);
	325	exit_code = 1;
30d65dbf	326	decompress_error = 1;
1da177e4 LT	327	}
1da177e4 LT	328
30d65dbf	329	static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
1da177e4 LT	330	{
1da177e4 LT	331	int result;
1da177e4 LT	332	crd_infd = in_fd;
1da177e4 LT	333	crd_outfd = out_fd;
df3ef3af	334
	335	if (!deco) {
	336	pr_emerg("Invalid ramdisk decompression routine. "
	337	"Select appropriate config option.\n");
	338	panic("Could not decompress initial ramdisk image.");
	339	}
	340
30d65dbf AK	341	result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
30d65dbf AK	342	if (decompress_error)
1da177e4	343	result = 1;
1da177e4 LT	344	return result;
1da177e4 LT	345	}