linux-kernel - Re: [d_path 0/7] Fixes to d

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Message-ID: <a36005b50704200815j30c95caele31536948343e29a@mail.gmail.com>
Date:	Fri, 20 Apr 2007 08:15:54 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Andreas Gruenbacher" <agruen@...e.de>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>, jjohansen@...e.de,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chrisw@...s-sol.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [d_path 0/7] Fixes to d_path: Respin

On 4/20/07, Andreas Gruenbacher <agruen@...e.de> wrote:
> Possibly for fstatfs(): fstatfs() has no way of looking up mount points per
> path name in /proc/mounts, and so it resorts to mapping from the numeric
> statfs->f_type to the filesystem name (e.g., "ext3"), looks up the first
> mount point with that name, and sets the statfs->f_flag flags based on that
> entry. This field may change from one arbitrary value to another.

What are you talking about?  fstatfs is a syscall, we do nothing but
copying values around at userlevel.

statvfs on the other hand does use /proc/mounts.  And it most
certainly does look at the mount point before looking at the
filesystem type.
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