linux-kernel - Re: [PATCH] exporting capability code/name pairs (try #6)

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Message-ID: <20080220055328.GA32014@kroah.com>
Date:	Tue, 19 Feb 2008 21:53:28 -0800
From:	Greg KH <greg@...ah.com>
To:	Kohei KaiGai <kaigai@...jp.nec.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Li Zefan <lizf@...fujitsu.com>, akpm@...l.org,
	"Andrew G. Morgan" <morgan@...nel.org>, jmorris@...ei.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, adobriyan@...il.com
Subject: Re: [PATCH] exporting capability code/name pairs (try #6)

On Wed, Feb 20, 2008 at 02:38:16PM +0900, Kohei KaiGai wrote:
> Greg KH wrote:
>> On Wed, Feb 20, 2008 at 01:38:59PM +0900, Kohei KaiGai wrote:
>>>>> If we can have a private member in kobj_attribute, we can found the 
>>> content
>>>>> to be returned in a single step.
>>>> Ok, again, just send me a patch that adds this functionality and we will
>>>> be very glad to consider it.
>>> [1/2] Add a private data field within kobj_attribute structure.
>>>
>>> This patch add a private data field, declared as void *, within 
>>> kobj_attribute
>>> structure. Anyone wants to use sysfs can store their private data to 
>>> refer at
>>> _show() and _store() method.
>>> It enables to share a single method function with several similar 
>>> entries,
>>> like ones to export the list of capabilities the running kernel 
>>> supported.
>> But your patch 2/2 doesn't use this interface, why not?
>
> Really?
> The following two _show() methods shared by every capabilities refer
> the private member of kobj_attribute.
>
> | +static ssize_t capability_name_show(struct kobject *kobj,
> | +                    struct kobj_attribute *attr,
> | +                    char *buffer)
> | +{
> | +    /* It returns numerical representation of capability. */
> | +    return scnprintf(buffer, PAGE_SIZE, "%d\n", (int) attr->data);
> | +}
> | +
> | +static ssize_t capability_code_show(struct kobject *kobj,
> | +                    struct kobj_attribute *attr,
> | +                    char *buffer)
> | +{
> | +    /* It returns symbolic representation of capability. */
> | +    return scnprintf(buffer, PAGE_SIZE, "%s\n", (char *) attr->data);
> | +}

Ah, sorry, missed that.  I also missed where this was set up as well :(

thanks,

greg k-h
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