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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-02 15:29:10 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-11 21:40:30 -0400
commitba4df2808a86f8b103c4db0b8807649383e9bd13 (patch)
treeb027ebf6d1345842686577e04d2cda1e4b05201f /init
parentcb450766bcafc7bd7d40e9a5a0050745e8c68b3e (diff)
downloadlinaro-lsk-ba4df2808a86f8b103c4db0b8807649383e9bd13.tar.gz
don't bother with kernel_thread/kernel_execve for launching linuxrc
exec_usermodehelper_fns() will do just fine... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'init')
-rw-r--r--init/do_mounts_initrd.c41
1 files changed, 16 insertions, 25 deletions
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 135959a276b..5e4ded51788 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -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();