linux-kernel - Re: [PATCH 1/1] Create megaraid ioctl device node

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Message-ID: <5187C8AB.90501@datasphere.ch>
Date:	Mon, 06 May 2013 17:13:47 +0200
From:	Patrick Monnerat <pm@...asphere.ch>
To:	Bjørn Mork <bjorn@...k.no>
CC:	Neela Syam Kolli <megaraidlinux@....com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Create megaraid ioctl device node

On 05/06/2013 04:23 PM, Bjørn Mork wrote:
> "Patrick Monnerat" <Patrick.Monnerat@...asphere.ch> writes:
>>    Create ioctl device node for megaraid_sas driver. Let this node be
>> managed by udev. Fix a typo.
>
> Or maybe just simplify it all and use a misc device instead?  See how
> this is done in e.g. drivers/scsi/mpt3sas/mpt3sas_ctl.c or
> drivers/message/fusion/mptctl.c

Yes, could be done that way, But I want to retain compatibility with 
existing shell scripts doing things like:

DEVICE=/dev/megaraid_sas_ioctl_node
DEVICENAME=megaraid_sas_ioctl
DEVICEPERM=400
MAJOR=`grep "$DEVICENAME" /proc/devices | awk '{print $1}'`

if [ -n "$MAJOR" -a ! -e "$DEVICE" ]; then
     mknod "$DEVICE" c "$MAJOR" 0
     chmod "$DEVICEPERM" "$DEVICE"
fi

Snippets like this one appear both in open-source projects and Dell scripts.

Patrick
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