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init: add initramfs_internal.h

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The new header only exports a single unpack function and a CPIO_HDRLEN
constant for future test use.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Link: https://lore.kernel.org/r/20250304061020.9815-2-ddiss@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Disseldorp 2025-03-04 16:57:44 +11:00 committed by Christian Brauner
parent 2014c95afe
commit 5f469c4f71
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 21 additions and 3 deletions
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16
init/initramfs.c
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@ -20,6 +20,7 @@
#include <linux/security.h>
#include "do_mounts.h"
#include "initramfs_internal.h"
static __initdata bool csum_present;
static __initdata u32 io_csum;
@ -256,7 +257,7 @@ static __initdata char *header_buf, *symlink_buf, *name_buf;
static int __init do_start(void)
{
read_into(header_buf, 110, GotHeader);
read_into(header_buf, CPIO_HDRLEN, GotHeader);
return 0;
}
@ -497,14 +498,23 @@ static unsigned long my_inptr __initdata; /* index of next byte to be processed
#include <linux/decompress/generic.h>
static char * __init unpack_to_rootfs(char *buf, unsigned long len)
/**
* unpack_to_rootfs - decompress and extract an initramfs archive
* @buf: input initramfs archive to extract
* @len: length of initramfs data to process
*
* Returns: NULL for success or an error message string
*
* This symbol shouldn't be used externally. It's available for unit tests.
*/
char * __init unpack_to_rootfs(char *buf, unsigned long len)
{
long written;
decompress_fn decompress;
const char *compress_name;
static __initdata char msg_buf[64];
header_buf = kmalloc(110, GFP_KERNEL);
header_buf = kmalloc(CPIO_HDRLEN, GFP_KERNEL);
symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);

8
init/initramfs_internal.h Normal file
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@ -0,0 +1,8 @@
// SPDX-License-Identifier: GPL-2.0
#ifndef __INITRAMFS_INTERNAL_H__
#define __INITRAMFS_INTERNAL_H__
char *unpack_to_rootfs(char *buf, unsigned long len);
#define CPIO_HDRLEN 110
#endif