linux-ext4 - Re: [PATCH 13/35] fallthru: ext2 fallthru support

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Message-ID: <20100421084211.GB22741@bolzano.suse.de>
Date:	Wed, 21 Apr 2010 10:42:11 +0200
From:	Jan Blunck <jblunck@...e.de>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Valerie Aurora <vaurora@...hat.com>, dwmw2@...radead.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, tytso@....edu,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 13/35] fallthru: ext2 fallthru support

On Tue, Apr 20, Jamie Lokier wrote:

> Miklos Szeredi wrote:
> > On Mon, 19 Apr 2010, Valerie Aurora wrote:
> > > I don't recall there being any technical reason not to look up the
> > > real inode number.  I just wrote it that we because I was lazy.  So I
> > > like returning the directory's d_ino better than a single magic
> > > number, but I'd at least like to try returning the real inode number
> > > too.
> > 
> > Note, "struct dirent" doesn't have d_dev, so you really can't return
> > the "real" inode number, that's on a different filesystem and just a
> > random number in the context of the the readdir in question.
> 
> Agree.  Does this inappropriate inode number for the union mount's
> st_dev happen with stat() on the actual files too?  That could be bad.

No, for stat() you do a lookup and that is returning the correct dentry/inode
for the filesystem the name is on.

We just return the the fallthru directory entries to give userspace an offset
that they can seekdir() to.

Regards,
	Jan

-- 
Jan Blunck <jblunck@...e.de>
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