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Assume kernel has devtmpfs enabled --> cleanup device creation & mount

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Cleanup device creation and initial mount by assuming that the kernel
has devtmpfs enabled.  This is the default for most modern GNU/Linux
distributions.  See http://lwn.net/Articles/331818/ for more info.

Also, since finit is targeted at deeply embedded systems hooks for the
BusyBox udev replacement, mdev has been added.  If MDEV is defined in
the build it will take care of both hotplugging of devices and initial
setup of /dev

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson committed 2012-09-17 16:05:41 +02:00
1 parent 2f527215d0
commit 855c7d8251
5 files changed
+76 -111
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finit.c
+20 -66
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@@ -79,8 +79,24 @@ int main(void)
chdir("/");
umask(022);
/*
* Mount base file system, kernel is assumed to run devtmpfs for /dev
*/
mount("none", "/proc", "proc", 0, NULL);
mount("none", "/proc/bus/usb", "usbfs", 0, NULL);
mount("none", "/sys", "sysfs", 0, NULL);
mkdir("/dev/pts", 0755);
mkdir("/dev/shm", 0755);
mount("none", "/dev/pts", "devpts", 0, "gid=5,mode=620");
mount("none", "/dev/shm", "tmpfs", 0, NULL);
/*
* Populate /dev and prepare for runtime events from kernel.
*/
#ifdef MDEV
system("sysctl -w kernel.hotplug=" MDEV);
system(MDEV " -s");
#endif
/*
* Parse kernel parameters
@@ -153,44 +169,12 @@ int main(void)
system(cmd);
continue;
}
#ifdef MAKE_DEVICES
/* This is used if the system uses udev and doesn't
* mount /dev as tmpfs in the initrd, or if it doesn't
* use an initrd. Mount /dev as tmpfs and create basic
* device nodes.
*/
if (MATCH_CMD(line, "mountdev", x)) {
mount("none", "/dev", "tmpfs", 0, "mode=0755");
chardev("/dev/null", 0666, 1, 3);
blkdev("/dev/sda1", 0660, 8, 1);
blkdev("/dev/sda2", 0660, 8, 2);
blkdev("/dev/sda3", 0660, 8, 3);
blkdev("/dev/sda4", 0660, 8, 4);
blkdev("/dev/sda5", 0660, 8, 5);
blkdev("/dev/sda6", 0660, 8, 6);
#ifdef MAKE_DEV_VCS
/* Caio reports that newer X.org needs these */
blkdev("/dev/vcs1", 0660, 7, 1);
blkdev("/dev/vcs2", 0660, 7, 2);
blkdev("/dev/vcs3", 0660, 7, 3);
blkdev("/dev/vcs4", 0660, 7, 4);
blkdev("/dev/vcsa1", 0660, 7, 129);
blkdev("/dev/vcsa2", 0660, 7, 130);
blkdev("/dev/vcsa3", 0660, 7, 131);
blkdev("/dev/vcsa4", 0660, 7, 132);
#endif
continue;
}
/* This works only if /dev is tmpfs! If not, create
* devices statically on the filesystem
*/
if (MATCH_CMD(line, "mknod ", x)) {
strcpy(cmd, "/bin/mknod ");
build_cmd(cmd, x, CMD_SIZE);
system(cmd);
continue;
}
#endif
}
fclose(f);
}
@@ -203,42 +187,12 @@ int main(void)
#ifdef REMOUNT_ROOTFS_RW
system("/bin/mount -n -o remount,rw /");
#endif
umask(0);
#ifdef MAKE_DEVICES
mkdir("/dev/shm", 0755);
mkdir("/dev/pts", 0755);
#endif
mount("none", "/dev/pts", "devpts", 0, "gid=5,mode=620");
mount("none", "/dev/shm", "tmpfs", 0, NULL);
mount("none", "/tmp", "tmpfs", 0, "mode=1777,size=128m");
mount("none", "/var/run", "tmpfs", 0, "mode=0755");
mount("none", "/var/lock", "tmpfs", 0, "mode=1777");
mount("none", "/proc/bus/usb", "usbfs", 0, NULL);
#ifdef SYSROOT
mount(SYSROOT, "/", NULL, MS_MOVE, NULL);
_d("make devices");
#ifdef MAKE_DEVICES
mkdir("/dev/input", 0755);
chardev("/dev/urandom", 0666, 1, 9);
chardev("/dev/ptmx", 0666, 5, 2);
chardev("/dev/null", 0666, 1, 3);
chmod("/dev/null", 0666);
chardev("/dev/mem", 0640, 1, 1);
chardev("/dev/tty0", 0660, 4, 0);
chardev("/dev/tty1", 0660, 4, 1);
chardev("/dev/tty2", 0660, 4, 2);
chardev("/dev/tty3", 0660, 4, 3);
chardev("/dev/input/mice", 0660, 13, 63);
chardev("/dev/input/event0", 0660, 13, 64);
chardev("/dev/agpgart", 0660, 10, 175);
blkdev("/dev/loop0", 0600, 7, 0);
#endif
umask(0);
unlink("/etc/mtab");
system("mount -a");
umask(0022);
/*
@@ -296,9 +250,9 @@ int main(void)
run_parts("/etc/resolvconf/update.d", "-i", NULL);
#else
system(RUNPARTS " --arg=i /etc/resolvconf/update.d");
#endif
#endif /* BUILTIN_RUNPARTS */
chdir("/");
#endif
#endif /* USE_ETC_RESOLVCONF_RUN */
#ifdef TOUCH_ETC_NETWORK_RUN_IFSTATE
touch("/etc/network/run/ifstate");