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 --- init/initramfs.c | 16 +++++++++++++--- init/initramfs_internal.h | 8 ++++++++ 2 files changed, 21 insertions(+), 3 deletions(-) create mode 100644 init/initramfs_internal.h
diff --git a/init/initramfs.c b/init/initramfs.c index b2f7583bb1f5c..002e83ae12ac7 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -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);
diff --git a/init/initramfs_internal.h b/init/initramfs_internal.h new file mode 100644 index 0000000000000..233dad16b0a00 --- /dev/null +++ b/init/initramfs_internal.h @@ -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