linux-kernel - Re: Getting debugfs mountpoint?

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Message-ID: <CA+cF-psuziZTJ=+OaRDszXWh6tjdo7QJW01kd-kUFcguUerGWg@mail.gmail.com>
Date:	Fri, 14 Sep 2012 19:19:29 -0700
From:	Jacob Sowles <sowlesj@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Getting debugfs mountpoint?

debugfs_create_dir, rather. Not debugfs_create_file.

On Fri, Sep 14, 2012 at 7:17 PM, Jacob Sowles <sowlesj@...il.com> wrote:
> The first instance of my code calls debugfs_create_file and stores a
> pointer to the dentry of that directory. But when the second instance
> calls debugfs_create_file, the function returns NULL because that
> directory already exists, so it doesn't return the dentry that I need.
>
> On Fri, Sep 14, 2012 at 7:11 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>> On Fri, Sep 14, 2012 at 07:07:43PM -0700, Jacob Sowles wrote:
>>> Multiple instances of my code can be run simultaneously, and all
>>> instances use the same debugfs directory, so I need the path to the
>>> debugfs root directory so that I can use filp_open to get the dentry
>>> for that directory.
>>
>> What's wrong with just storing a pointer to that dentry in a variable?
>> And what do you want an opened file (of a directory, at that) on debugfs?
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