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Commit ba4df280 authored by Al Viro's avatar Al Viro
Browse files

don't bother with kernel_thread/kernel_execve for launching linuxrc 



exec_usermodehelper_fns() will do just fine...

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent cb450766

init/do_mounts_initrd.c

+16 −25
Original line number Diff line number Diff line
@@ -16,13 +16,13 @@ 
#include <linux/initrd.h>

#include <linux/sched.h>

#include <linux/freezer.h>

#include <linux/kmod.h>



#include "do_mounts.h"



unsigned long initrd_start, initrd_end;

int initrd_below_start_ok;

unsigned int real_root_dev;	/* do_proc_dointvec cannot handle kdev_t */

static int __initdata old_fd, root_fd;

static int __initdata mount_initrd = 1;



static int __init no_initrd(char *str)
@@ -33,33 +33,29 @@ static int __init no_initrd(char *str) 


__setup("noinitrd", no_initrd);



static int __init do_linuxrc(void *_shell)

static int init_linuxrc(struct subprocess_info *info, struct cred *new)

{

	static const char *argv[] = { "linuxrc", NULL, };

	extern const char *envp_init[];

	const char *shell = _shell;



	sys_close(old_fd);sys_close(root_fd);

	sys_unshare(CLONE_FS | CLONE_FILES);

	/* move initrd over / and chdir/chroot in initrd root */

	sys_chdir("/root");

	sys_mount(".", "/", NULL, MS_MOVE, NULL);

	sys_chroot(".");

	sys_setsid();

	return kernel_execve(shell, argv, envp_init);

	return 0;

}



static void __init handle_initrd(void)

{

	static char *argv[] = { "linuxrc", NULL, };

	extern char *envp_init[];

	int error;

	int pid;



	real_root_dev = new_encode_dev(ROOT_DEV);

	create_dev("/dev/root.old", Root_RAM0);

	/* mount initrd on rootfs' /root */

	mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);

	sys_mkdir("/old", 0700);

	root_fd = sys_open("/", 0, 0);

	old_fd = sys_open("/old", 0, 0);

	/* move initrd over / and chdir/chroot in initrd root */

	sys_chdir("/root");

	sys_mount(".", "/", NULL, MS_MOVE, NULL);

	sys_chroot(".");

	sys_chdir("/old");



	/*

	 * In case that a resume from disk is carried out by linuxrc or one of
@@ -67,27 +63,22 @@ static void __init handle_initrd(void) 
	 */

	current->flags |= PF_FREEZER_SKIP;



	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);

	if (pid > 0)

		while (pid != sys_wait4(-1, NULL, 0, NULL))

			yield();

	call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC,

			init_linuxrc, NULL, NULL);



	current->flags &= ~PF_FREEZER_SKIP;



	/* move initrd to rootfs' /old */

	sys_fchdir(old_fd);

	sys_mount("/", ".", NULL, MS_MOVE, NULL);

	sys_mount("..", ".", NULL, MS_MOVE, NULL);

	/* switch root and cwd back to / of rootfs */

	sys_fchdir(root_fd);

	sys_chroot(".");

	sys_close(old_fd);

	sys_close(root_fd);

	sys_chroot("..");



	if (new_decode_dev(real_root_dev) == Root_RAM0) {

		sys_chdir("/old");

		return;

	}



	sys_chdir("/");

	ROOT_DEV = new_decode_dev(real_root_dev);

	mount_root();