[PATCH] more udev-016/extras/multipath

> Hello,
>
> incremental to udev-016/extras/multipath,
>
> * don't rely on the linux symlink in the udev/klibc dir since
>   udev build doesn't use it anymore. This corrects build breakage
> * remove make_dm_node fn & call. Rely on udev for this.
>
> The first patch is to be applied.
> The second is conditioned by udev dealing correctly with devmap names.
>
> For this I can suggest a CALLOUT rule like this :
> KERNEL="dm-[0-9]*", PROGRAM="/tmp/name_devmap %M %m", NAME="%k",
> SYMLINK="%c"
>
> With name_devmap like :
> #!/bin/sh
> /usr/sbin/dmsetup ls|/bin/grep "$1, $2"|/usr/bin/awk '{print $1}'
>

ok I coded the suggested tool.
it works with the following rule :
KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK="%c"

I don't know if it's right to keep this tools packaged with multipath because
it's widely more general.

Maybe Joe should merge it in the device-mapper package or provide the
functionnality through dmsetup ?

1 files changed, 8 insertions, 0 deletions

diff --git a/extras/multipath/README b/extras/multipath/README
index 417a0d38e4..80945db438 100644
--- a/extras/multipath/README
+++ b/extras/multipath/README
@@ -8,6 +8,8 @@ o libsysfs : comes with sysutils or udev
   See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
 o Linux kernel 2.6.0 with udm5 patchset
   http://people.sistina.com/~thornber/dm/
+o udev
+  See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
 
 How it works :
 ==============
@@ -53,6 +55,12 @@ struct multipath {
 When mp is filled, the device maps are fed to the kernel
 through libdevmapper.
 
+The naming of the corresponding block device is handeld 
+by udev with the help of the devmap_name proggy. It is 
+called by the following rule in /etc/udev/udev.rules :
+KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \
+NAME="%k", SYMLINK="%c"
+
 Notes :
 =======