Re: /dev/dm-0

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On Sun, Mar 26, 2006 at 12:24:56PM +0200, Luca Berra wrote:
On Mon, Mar 20, 2006 at 04:21:39PM -0500, Peter Jones wrote:
On Mon, 2006-03-20 at 10:55 -0500, Phillip Susi wrote:
I have /dev/mapper/via_hfciifae as the base raid device, and partitions on the device with a number appended to the above. I believe that the dmraid utility creates devices with this style of name, and if you are seeing /dev/dm-0 it is because udev is creating that node because as far as the kernel knows, the name of the device ( as exported by sysfs ) is "dm-0". Udev probably shouldn't be creating device nodes for device mapper devices, but if it does, you can simply ignore them.

Well, really we should fix the kernel, and make these /dev/dm-$DMNAME
(and thus /sys/block/dm-$DMNAME )

maybe mapper/$DMNAME (and thus /sys/block/mapper!$DMNAME) so we are
consistent with other drivers and udev will use /dev/mapper/$DMNAME

this should be fairly easy to change,
just add a name parameter to
dm_create(), dm_create_with_minor(), create_aux and alloc_dev() in
drivers/md/dm.c

and use that parameter instead of "dm-%s" when setting disk_name just
before add_disk in alloc_dev()

then pass param->name as the name parameter to dm_createXXXXX() in
drivers/md/dm-ioctl.c:dev_create()

if there are no objections i might even be tempted to send a patch.

oh, yes, we would also need to plug into the rename ioctl.
but i am not sure how this should be done.
i don't feel like unregister_blkdev and add again is a good idea.

L.

--
Luca Berra -- bluca@xxxxxxxxxx
       Communication Media & Services S.r.l.
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