[mirror_ubuntu-bionic-kernel.git] / init / do_mounts_rd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Many of the syscalls used in this file expect some of the arguments
 * to be __user pointers not __kernel pointers.  To limit the sparse
 * noise, turn off sparse checking for this file.
 */
#ifdef __CHECKER__
#undef __CHECKER__
#warning "Sparse checking disabled for this file"
#endif

#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
	 */
	sys_lseek(fd, start_block * BLOCK_SIZE, 0);
	sys_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
	 */
	sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
	sys_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
	 */
	sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
	sys_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:
	sys_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 = sys_open("/dev/ram", O_RDWR, 0);
	if (out_fd < 0)
		goto out;

	in_fd = sys_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 (sys_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 (sys_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)) {
			printk("done disk #%d.\n", disk++);
			rotate = 0;
			if (sys_close(in_fd)) {
				printk("Error closing the disk.\n");
				goto noclose_input;
			}
			change_floppy("disk #%d", disk);
			in_fd = sys_open(from, O_RDONLY, 0);
			if (in_fd < 0)  {
				printk("Error opening disk.\n");
				goto noclose_input;
			}
			printk("Loading disk #%d... ", disk);
		}
		sys_read(in_fd, buf, BLOCK_SIZE);
		sys_write(out_fd, buf, BLOCK_SIZE);
#if !defined(CONFIG_S390)
		if (!(i % 16)) {
			pr_cont("%c\b", rotator[rotate & 0x3]);
			rotate++;
		}
#endif
	}
	printk("done.\n");

successful_load:
	res = 1;
done:
	sys_close(in_fd);
noclose_input:
	sys_close(out_fd);
out:
	kfree(buf);
	sys_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 = sys_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 = sys_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
c67e5382 HS	2	/*
	3	* Many of the syscalls used in this file expect some of the arguments
	4	* to be __user pointers not __kernel pointers. To limit the sparse
	5	* noise, turn off sparse checking for this file.
	6	*/
	7	#ifdef __CHECKER__
	8	#undef __CHECKER__
	9	#warning "Sparse checking disabled for this file"
	10	#endif
1da177e4 LT	11
	12	#include <linux/kernel.h>
	13	#include <linux/fs.h>
	14	#include <linux/minix_fs.h>
	15	#include <linux/ext2_fs.h>
	16	#include <linux/romfs_fs.h>
f7f4f4dd	17	#include <uapi/linux/cramfs_fs.h>
1da177e4 LT	18	#include <linux/initrd.h>
1da177e4 LT	19	#include <linux/string.h>
5a0e3ad6	20	#include <linux/slab.h>
1da177e4 LT	21
1da177e4 LT	22	#include "do_mounts.h"
b8fed87d	23	#include "../fs/squashfs/squashfs_fs.h"
1da177e4	24
30d65dbf AK	25	#include <linux/decompress/generic.h>
30d65dbf AK	26
30d65dbf	27
1da177e4 LT	28	int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
	29
	30	static int __init prompt_ramdisk(char *str)
	31	{
	32	rd_prompt = simple_strtol(str,NULL,0) & 1;
	33	return 1;
	34	}
	35	__setup("prompt_ramdisk=", prompt_ramdisk);
	36
	37	int __initdata rd_image_start; /* starting block # of image */
	38
	39	static int __init ramdisk_start_setup(char *str)
	40	{
	41	rd_image_start = simple_strtol(str,NULL,0);
	42	return 1;
	43	}
	44	__setup("ramdisk_start=", ramdisk_start_setup);
	45
30d65dbf	46	static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
1da177e4 LT	47
	48	/*
	49	* This routine tries to find a RAM disk image to load, and returns the
	50	* number of blocks to read for a non-compressed image, 0 if the image
	51	* is a compressed image, and -1 if an image with the right magic
	52	* numbers could not be found.
	53	*
	54	* We currently check for the following magic numbers:
b172fd88 PA	55	* minix
b172fd88 PA	56	* ext2
1da177e4 LT	57	* romfs
1da177e4 LT	58	* cramfs
b8fed87d	59	* squashfs
b172fd88	60	* gzip
1bf49dd4	61	* bzip2
	62	* lzma
	63	* xz
	64	* lzo
	65	* lz4
1da177e4	66	*/
b172fd88	67	static int __init
30d65dbf	68	identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
1da177e4 LT	69	{
	70	const int size = 512;
	71	struct minix_super_block *minixsb;
1da177e4 LT	72	struct romfs_super_block *romfsb;
1da177e4 LT	73	struct cramfs_super *cramfsb;
b8fed87d	74	struct squashfs_super_block *squashfsb;
1da177e4 LT	75	int nblocks = -1;
1da177e4 LT	76	unsigned char *buf;
889c92d2	77	const char *compress_name;
39429c5e	78	unsigned long n;
1da177e4 LT	79
1da177e4 LT	80	buf = kmalloc(size, GFP_KERNEL);
c80544dc	81	if (!buf)
ea611b26	82	return -ENOMEM;
1da177e4 LT	83
1da177e4 LT	84	minixsb = (struct minix_super_block *) buf;
1da177e4 LT	85	romfsb = (struct romfs_super_block *) buf;
1da177e4 LT	86	cramfsb = (struct cramfs_super *) buf;
b8fed87d	87	squashfsb = (struct squashfs_super_block *) buf;
1da177e4 LT	88	memset(buf, 0xe5, size);
	89
	90	/*
b172fd88	91	* Read block 0 to test for compressed kernel
1da177e4 LT	92	*/
	93	sys_lseek(fd, start_block * BLOCK_SIZE, 0);
	94	sys_read(fd, buf, size);
	95
889c92d2	96	*decompressor = decompress_method(buf, size, &compress_name);
23a22d57	97	if (compress_name) {
889c92d2 PA	98	printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
889c92d2 PA	99	compress_name, start_block);
23a22d57	100	if (!*decompressor)
73310a16 PA	101	printk(KERN_EMERG
73310a16 PA	102	"RAMDISK: %s decompressor not configured!\n",
23a22d57	103	compress_name);
889c92d2 PA	104	nblocks = 0;
889c92d2 PA	105	goto done;
1da177e4 LT	106	}
	107
	108	/* romfs is at block zero too */
	109	if (romfsb->word0 == ROMSB_WORD0 &&
	110	romfsb->word1 == ROMSB_WORD1) {
	111	printk(KERN_NOTICE
	112	"RAMDISK: romfs filesystem found at block %d\n",
	113	start_block);
	114	nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
	115	goto done;
	116	}
	117
	118	if (cramfsb->magic == CRAMFS_MAGIC) {
	119	printk(KERN_NOTICE
	120	"RAMDISK: cramfs filesystem found at block %d\n",
	121	start_block);
	122	nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
	123	goto done;
	124	}
	125
b8fed87d PL	126	/* squashfs is at block zero too */
	127	if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
	128	printk(KERN_NOTICE
	129	"RAMDISK: squashfs filesystem found at block %d\n",
	130	start_block);
	131	nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
	132	>> BLOCK_SIZE_BITS;
	133	goto done;
	134	}
	135
f919b923 NA	136	/*
	137	* Read 512 bytes further to check if cramfs is padded
	138	*/
	139	sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
	140	sys_read(fd, buf, size);
	141
	142	if (cramfsb->magic == CRAMFS_MAGIC) {
	143	printk(KERN_NOTICE
	144	"RAMDISK: cramfs filesystem found at block %d\n",
	145	start_block);
	146	nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
	147	goto done;
	148	}
	149
1da177e4 LT	150	/*
	151	* Read block 1 to test for minix and ext2 superblock
	152	*/
	153	sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
	154	sys_read(fd, buf, size);
	155
	156	/* Try minix */
	157	if (minixsb->s_magic == MINIX_SUPER_MAGIC \|\|
	158	minixsb->s_magic == MINIX_SUPER_MAGIC2) {
	159	printk(KERN_NOTICE
	160	"RAMDISK: Minix filesystem found at block %d\n",
	161	start_block);
	162	nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
	163	goto done;
	164	}
	165
	166	/* Try ext2 */
39429c5e AV	167	n = ext2_image_size(buf);
39429c5e AV	168	if (n) {
1da177e4 LT	169	printk(KERN_NOTICE
	170	"RAMDISK: ext2 filesystem found at block %d\n",
	171	start_block);
39429c5e	172	nblocks = n;
1da177e4 LT	173	goto done;
	174	}
	175
	176	printk(KERN_NOTICE
	177	"RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
	178	start_block);
b172fd88	179
1da177e4 LT	180	done:
	181	sys_lseek(fd, start_block * BLOCK_SIZE, 0);
	182	kfree(buf);
	183	return nblocks;
	184	}
	185
	186	int __init rd_load_image(char *from)
	187	{
	188	int res = 0;
	189	int in_fd, out_fd;
	190	unsigned long rd_blocks, devblocks;
	191	int nblocks, i, disk;
	192	char *buf = NULL;
	193	unsigned short rotate = 0;
30d65dbf	194	decompress_fn decompressor = NULL;
bc58450b	195	#if !defined(CONFIG_S390)
1da177e4 LT	196	char rotator[4] = { '\|' , '/' , '-' , '\\' };
	197	#endif
	198
c67e5382	199	out_fd = sys_open("/dev/ram", O_RDWR, 0);
1da177e4 LT	200	if (out_fd < 0)
	201	goto out;
	202
	203	in_fd = sys_open(from, O_RDONLY, 0);
	204	if (in_fd < 0)
	205	goto noclose_input;
	206
30d65dbf	207	nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
1da177e4 LT	208	if (nblocks < 0)
	209	goto done;
	210
	211	if (nblocks == 0) {
30d65dbf	212	if (crd_load(in_fd, out_fd, decompressor) == 0)
1da177e4	213	goto successful_load;
1da177e4 LT	214	goto done;
	215	}
	216
	217	/*
	218	* NOTE NOTE: nblocks is not actually blocks but
	219	* the number of kibibytes of data to load into a ramdisk.
1da177e4 LT	220	*/
	221	if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
	222	rd_blocks = 0;
	223	else
	224	rd_blocks >>= 1;
	225
	226	if (nblocks > rd_blocks) {
	227	printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
	228	nblocks, rd_blocks);
	229	goto done;
	230	}
b172fd88	231
1da177e4 LT	232	/*
	233	* OK, time to copy in the data
	234	*/
	235	if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
	236	devblocks = 0;
	237	else
	238	devblocks >>= 1;
	239
	240	if (strcmp(from, "/initrd.image") == 0)
	241	devblocks = nblocks;
	242
	243	if (devblocks == 0) {
	244	printk(KERN_ERR "RAMDISK: could not determine device size\n");
	245	goto done;
	246	}
	247
	248	buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
d613c3e2	249	if (!buf) {
1da177e4 LT	250	printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
	251	goto done;
	252	}
	253
	254	printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
	255	nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
	256	for (i = 0, disk = 1; i < nblocks; i++) {
	257	if (i && (i % devblocks == 0)) {
	258	printk("done disk #%d.\n", disk++);
	259	rotate = 0;
	260	if (sys_close(in_fd)) {
	261	printk("Error closing the disk.\n");
	262	goto noclose_input;
	263	}
	264	change_floppy("disk #%d", disk);
	265	in_fd = sys_open(from, O_RDONLY, 0);
	266	if (in_fd < 0) {
	267	printk("Error opening disk.\n");
	268	goto noclose_input;
	269	}
	270	printk("Loading disk #%d... ", disk);
	271	}
	272	sys_read(in_fd, buf, BLOCK_SIZE);
	273	sys_write(out_fd, buf, BLOCK_SIZE);
bc58450b	274	#if !defined(CONFIG_S390)
1da177e4	275	if (!(i % 16)) {
18594e9b	276	pr_cont("%c\b", rotator[rotate & 0x3]);
1da177e4 LT	277	rotate++;
	278	}
	279	#endif
	280	}
	281	printk("done.\n");
	282
	283	successful_load:
	284	res = 1;
	285	done:
	286	sys_close(in_fd);
	287	noclose_input:
	288	sys_close(out_fd);
	289	out:
	290	kfree(buf);
c67e5382	291	sys_unlink("/dev/ram");
1da177e4 LT	292	return res;
	293	}
	294
	295	int __init rd_load_disk(int n)
	296	{
	297	if (rd_prompt)
	298	change_floppy("root floppy disk to be loaded into RAM disk");
bdaf8529 GKH	299	create_dev("/dev/root", ROOT_DEV);
bdaf8529 GKH	300	create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
1da177e4 LT	301	return rd_load_image("/dev/root");
	302	}
	303
1da177e4	304	static int exit_code;
30d65dbf	305	static int decompress_error;
1da177e4 LT	306	static int crd_infd, crd_outfd;
1da177e4 LT	307
d97b07c5	308	static long __init compr_fill(void *buf, unsigned long len)
1da177e4	309	{
d97b07c5	310	long r = sys_read(crd_infd, buf, len);
30d65dbf AK	311	if (r < 0)
	312	printk(KERN_ERR "RAMDISK: error while reading compressed data");
	313	else if (r == 0)
	314	printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
	315	return r;
1da177e4 LT	316	}
1da177e4 LT	317
d97b07c5	318	static long __init compr_flush(void *window, unsigned long outcnt)
1da177e4	319	{
d97b07c5	320	long written = sys_write(crd_outfd, window, outcnt);
30d65dbf AK	321	if (written != outcnt) {
	322	if (decompress_error == 0)
	323	printk(KERN_ERR
d97b07c5	324	"RAMDISK: incomplete write (%ld != %ld)\n",
30d65dbf AK	325	written, outcnt);
	326	decompress_error = 1;
	327	return -1;
	328	}
	329	return outcnt;
1da177e4 LT	330	}
	331
	332	static void __init error(char *x)
	333	{
	334	printk(KERN_ERR "%s\n", x);
	335	exit_code = 1;
30d65dbf	336	decompress_error = 1;
1da177e4 LT	337	}
1da177e4 LT	338
30d65dbf	339	static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
1da177e4 LT	340	{
1da177e4 LT	341	int result;
1da177e4 LT	342	crd_infd = in_fd;
1da177e4 LT	343	crd_outfd = out_fd;
df3ef3af	344
	345	if (!deco) {
	346	pr_emerg("Invalid ramdisk decompression routine. "
	347	"Select appropriate config option.\n");
	348	panic("Could not decompress initial ramdisk image.");
	349	}
	350
30d65dbf AK	351	result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
30d65dbf AK	352	if (decompress_error)
1da177e4	353	result = 1;
1da177e4 LT	354	return result;
1da177e4 LT	355	}