linux-kernel - Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map

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Message-ID: <4E6039BA.1010805@gmail.com>
Date:	Thu, 01 Sep 2011 19:04:42 -0700
From:	Nicholas Miell <nmiell@...il.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Cyrill Gorcunov <gorcunov@...nvz.org>, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Nathan Lynch <ntl@...ox.com>,
	Oren Laadan <orenl@...columbia.edu>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Glauber Costa <glommer@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/ directory
 v6

On 09/01/2011 06:58 PM, Tejun Heo wrote:
> On Thu, Sep 01, 2011 at 06:54:32PM -0700, Nicholas Miell wrote:
>> This doesn't seem to fully export all the information passed to mmap(2)
>> -- it encompasses the addr, size, fd and (assuming the generated
>> symlink's permissions are accurate) prot parameters, but does nothing to
>> export the flags or offset parameters.
> 
> It looks like,
> 
> /proc/*/fd : fdinfo ~= map_files : maps
> 

So are the filenames in /proc/$PID/map_files/ guaranteed to be identical
to the first field (first two fields? the part before the first space)
in /proc/$PID/maps?

When I open a file in /proc/$PID/map_files/, is offset 0 the start of
the file on disk or is it the first byte of the mapping?
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