linux-kernel - Re: Two questions regarding Opening files within Kernel!

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Message-Id: <7DFF46D2-74EA-4D03-AD09-8DE270D6FB99@e18.physik.tu-muenchen.de>
Date:	Sat, 7 Apr 2007 11:22:57 +0200
From:	Roland Kuhn <rkuhn@....physik.tu-muenchen.de>
To:	JanuGerman <doublemalam@...oo.co.uk>
Cc:	linuxkernel <linux-kernel@...r.kernel.org>
Subject: Re: Two questions regarding Opening files within Kernel!

Hi!

On 7 Apr 2007, at 08:58, JanuGerman wrote:

> 1)   I have just a file path with me, an absolute path, but no  
> dentry, no inode, no vfsmount object, which function i can call to  
> get a "file" object associated with the absoulte file path. I have  
> surfed arround the source code especially fs/open.c and some other  
> files, but each function requires a parameter "mode" and "fd"  
> beside file path. Actually, i was confuse about the "mode"  
> parameter (and its differece with "flag"), like what to send, and  
> secondly for "fd", i am not sure, what value to send as there is no  
> file infact and only file path exists. Any idea?
>
No, but I'm no guru either.

> 2) Any functionality within linux kernel source code, to read one  
> line per file? or some indirect way to set buffer size for one  
> read?. That is, any existing header file for doing text I/O rather  
> than binary within the kernel source code?
>
Do you have a compelling reason for not letting userspace feed the  
file to your driver? That would be the natural and much easier way, I  
suppose...

Ciao,
                     Roland

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