use hotplug2 for serializing hotplug events on 2.6

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7097 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/etc/init.d/boot

@@ -27,13 +27,11 @@ start() {
 	ln -s /tmp/resolv.conf.auto /tmp/resolv.conf
 	[ "$FAILSAFE" = "true" ] && touch /tmp/.failsafe
 	
-	# manually trigger hotplug before loading modules
+	# the coldplugging of network interfaces needs to happen later, so we do it manually here
 	for iface in $(awk -F: '/:/ {print $1}' /proc/net/dev); do
 		/usr/bin/env -i ACTION=add INTERFACE="$iface" /sbin/hotplug-call net
 	done
-	
+	/sbin/hotplug2 --persistent --max-children 1 &
-	/sbin/hotplug2 --persistent --max-children 5 &
-	echo /sbin/hotplug-call > /proc/sys/kernel/hotplug
 
 	# create /dev/root if it doesn't exist
 	[ -e /dev/root ] || {

package/base-files/files/sbin/mount_root

@@ -4,17 +4,26 @@
 
 mount none /proc -t proc
 size=$(awk '/Mem:/ {l=5242880;print((s=$2/2)<l)?$2-l:s}' /proc/meminfo)
+
 mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
-if grep devfs /proc/filesystems > /dev/null; then
+if grep devfs /proc/filesystems >/dev/null; then
 	mount none /dev -t devfs
 else
-	mount -t sysfs none /sys
 	mount -t tmpfs tmpfs /dev -o size=512K
 	mknod /dev/console c 5 1
 	exec >/dev/console </dev/console 2>&1
-	mkdir /dev/shm
-	/sbin/hotplug2 --no-persistent --coldplug --max-children 1
 fi
+mkdir /dev/shm
+if grep sysfs /proc/filesystems >/dev/null; then
+	mount -t sysfs none /sys
+	HOTPLUG=""
+	# use a minimal ruleset only for creating device nodes
+	/sbin/hotplug2 --no-persistent --coldplug --set-rules-file /etc/hotplug2-init.rules
+else
+	HOTPLUG="/sbin/hotplug2-dnode"
+fi
+echo "$HOTPLUG" > /proc/sys/kernel/hotplug
+
 mkdir -p /dev/pts
 mount none /dev/pts -t devpts
 

package/hotplug2/Makefile

@@ -21,7 +21,6 @@ include $(INCLUDE_DIR)/package.mk
 define Package/hotplug2
   SECTION:=utils
   CATEGORY:=Utilities
-  DEPENDS:=@LINUX_2_6 +udevtrigger
   TITLE:=Dynamic device management subsystem for embedded systems
   URL:=http://isteve.bofh.cz/~isteve/hotplug2/
 endef
@@ -32,6 +31,9 @@ in a tiny pack, intended for Linux early userspace: Init RAM FS and InitRD.
 endef
 
 define Package/hotplug2/install
+	$(INSTALL_DIR) $(1)/etc
+	$(INSTALL_DATA) ./files/hotplug2.rules $(1)/etc/
+	$(INSTALL_DATA) ./files/hotplug2-init.rules $(1)/etc/
 	$(INSTALL_DIR) $(1)/sbin
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/hotplug2 $(1)/sbin/
 endef

package/hotplug2/files/hotplug2-init.rules

@@ -4,9 +4,6 @@ DEVICENAME ~~ (tun|tap[0-9]) {
 }
 
 DEVPATH is set {
-			makedev /dev/%DEVICENAME% 0644
+	makedev /dev/%DEVICENAME% 0644
 }
 
-MODALIAS is set {
-			exec /sbin/modprobe -q %MODALIAS% ;
-}

package/hotplug2/files/hotplug2.rules

@@ -0,0 +1,12 @@
+DEVICENAME ~~ (tun|tap[0-9]) {
+	makedev /dev/net/%DEVICENAME% 0644
+	next
+}
+
+DEVPATH is set {
+	makedev /dev/%DEVICENAME% 0644
+}
+
+SUBSYSTEM ~~ (net|button) {
+	exec /sbin/hotplug-call %SUBSYSTEM%;
+}

package/hotplug2/patches/100-rules_override.patch

@@ -0,0 +1,34 @@
+diff -ur hotplug2.old/hotplug2.c hotplug2.dev/hotplug2.c
+--- hotplug2.old/hotplug2.c	2006-10-08 15:18:23.000000000 +0200
++++ hotplug2.dev/hotplug2.c	2007-05-05 11:38:51.456551560 +0200
+@@ -391,6 +391,7 @@
+ 	int rv = 0;
+ 	int i;
+ 	char *coldplug_command = NULL;
++	char *rules_file = HOTPLUG2_RULE_PATH;
+ 	sigset_t block_mask;
+ 	
+ 	struct rules_t *rules = NULL;
+@@ -435,6 +436,13 @@
+ 						break;
+ 					
+ 					modprobe_command = *argv;
++				} else if (!strcmp(*argv, "--set-rules-file")) {
++					argv++;
++					argc--;
++					if (argc <= 0)
++						break;
++					
++					rules_file = *argv;
+ 				}
+ 			}
+ 		}
+@@ -443,7 +451,7 @@
+ #ifdef HAVE_RULES
+ 	if (!dumb) {
+ 		filemap = MAP_FAILED;
+-		rule_fd = open(HOTPLUG2_RULE_PATH, O_RDONLY | O_NOATIME);
++		rule_fd = open(rules_file, O_RDONLY | O_NOATIME);
+ 		if (rule_fd == -1) {
+ 			dumb = 1;
+ 			ERROR("rules parse","Unable to open rules file: %s.", strerror(errno));

target/linux/brcm-2.4/base-files/default/etc/preinit

@@ -31,14 +31,16 @@ if grep devfs /proc/filesystems > /dev/null; then
 	mount none /dev -t devfs
 	M0=/dev/pty/m0
 	M1=/dev/pty/m1
+	HOTPLUG=/sbin/hotplug-call
 else
 	mount -t sysfs none /sys
 	mount -t tmpfs tmpfs /dev -o size=512K
 	mknod /dev/console c 5 1
 	mkdir /dev/shm
-	/sbin/hotplug2 --no-persistent --coldplug --max_children 1
+	/sbin/hotplug2 --no-persistent --coldplug --set-rules-file /etc/hotplug2-init.rules
 	M0=/dev/ptmx
 	M1=/dev/ptmx
+	HOTPLUG=
 fi
 mkdir -p /dev/pts
 mount none /dev/pts -t devpts
@@ -86,7 +88,7 @@ eval ${FAILSAFE:+failsafe}
 
 lock -w /tmp/.failsafe
 set_state preinit
-echo /sbin/hotplug-call > /proc/sys/kernel/hotplug
+echo "$HOTPLUG" > /proc/sys/kernel/hotplug
 
 ifconfig $ifname 0.0.0.0 down
 

target/linux/brcm-2.4/config/default

@@ -175,7 +175,6 @@ CONFIG_MSDOS_FS=m
 CONFIG_MTD_BCM947XX=y
 CONFIG_MTD_CFI_SSTSTD=y
 CONFIG_MTD_SFLASH=y
-# CONFIG_MTD_SPLIT_ROOTFS is not set
 # CONFIG_NATSEMI is not set
 # CONFIG_NE2K_PCI is not set
 # CONFIG_NE3210 is not set

target/linux/generic-2.6/config-template

@@ -366,6 +366,7 @@ CONFIG_IP6_NF_MATCH_EUI64=m
 CONFIG_IP6_NF_MATCH_FRAG=m
 CONFIG_IP6_NF_MATCH_HL=m
 CONFIG_IP6_NF_MATCH_IPV6HEADER=m
+CONFIG_IP6_NF_MATCH_LIMIT=m
 CONFIG_IP6_NF_MATCH_OPTS=m
 CONFIG_IP6_NF_MATCH_OWNER=m
 CONFIG_IP6_NF_MATCH_RT=m