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init/initramfs: Add dump_initrd command line option

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Add a dump_initrd option to allow dumping /initrd.image after successful
unpack.

Require BLK_DEV_RAM=y.

Change-Id: I77a41867afa7b4a51604a5153792a49efbab6189
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
This commit is contained in:
Jeffy Chen 2018-12-15 21:24:07 +08:00 • committed by Tao Huang
commit e0302dc306
1 changed files with 17 additions and 1 deletions
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18
init/initramfs.c
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@ -513,6 +513,17 @@ static int __init retain_initrd_param(char *str)
}
__setup("retain_initrd", retain_initrd_param);
static int __initdata do_dump_initrd;
static int __init dump_initrd_param(char *str)
{
if (*str)
return 0;
do_dump_initrd = 1;
return 1;
}
__setup("dump_initrd", dump_initrd_param);
extern char __initramfs_start[];
extern unsigned long __initramfs_size;
#include <linux/initrd.h>
@ -612,14 +623,19 @@ static int __init populate_rootfs(void)
printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
err = unpack_to_rootfs((char *)initrd_start,
initrd_end - initrd_start);
if (!err)
if (!err) {
if (do_dump_initrd)
goto dump;
goto done;
}
clean_rootfs();
unpack_to_rootfs(__initramfs_start, __initramfs_size);
printk(KERN_INFO "rootfs image is not initramfs (%s)"
"; looks like an initrd\n", err);
dump:
fd = ksys_open("/initrd.image",
O_WRONLY|O_CREAT, 0700);
if (fd >= 0) {