linux-kernel - Re: How Linux /proc filesystem convert a fd to the actual pathname?

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Message-ID: <Pine.LNX.4.64.0708210730070.5333@fbirervta.pbzchgretzou.qr>
Date:	Tue, 21 Aug 2007 07:32:06 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Xin Zhao <uszhaoxin@...il.com>
cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: How Linux /proc filesystem convert a fd to the actual pathname?


>In the Linux proc filesystem,  /proc/[pid]/fd is a link to the
>actually the actual pathname of the opened file.
>
>I am curious how Linux convert an fd to the pathname?  Does it
>recursively walk back from current dentry to the root?

AFAICS the fd has a pointer to the vma of the file (don't ask me why), 
which in turn has a 'struct file' pointer, which in turn has the 
required 'struct dentry' in it.


	Jan
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