linux-kernel - Re: [RFC] readdir mess

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Message-ID: <20080824110326.GO28946@ZenIV.linux.org.uk>
Date:	Sun, 24 Aug 2008 12:03:26 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jan Harkes <jaharkes@...cmu.edu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, bfields@...ldses.org
Subject: Re: [RFC] readdir mess

On Sun, Aug 24, 2008 at 11:10:14AM +0100, Al Viro wrote:

> I agree that such transition plan makes sense, but that'll take more
> preliminary work than in your patch; there are other vfs_readdir() and
> ->readdir() callers, not just the obvious syscall ones.

BTW, nfsd4_list_rec_dir() is FUBAR.  Its users, actually - they try to use it
for lovely things like kernel-side rm -rf /var/lib/nfs/v4recovery/* and
screw up in rather amusing ways..  I'm not even talking about the effects
of OOM (dentry leak); if you rename something away from that directory,
you'll get vfs_rmdir(dir, dentry) with dentry not being a child of dir,
which means deadlock if you are lucky and underlying fs corruption if you
are not...

I really wonder WTF is that doing in the kernel, anyway.  Looks like an
obvious candidate for userland helper...
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