linux-kernel - Re: [PATCH 19/19] CacheFiles: Permit daemon to probe inuseness of a cache file

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Date:	Wed, 15 Nov 2006 16:10:08 +0000
From:	David Howells <dhowells@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	akpm@...l.org, sds@...ho.nsa.gov, trond.myklebust@....uio.no,
	selinux@...ho.nsa.gov, linux-kernel@...r.kernel.org,
	aviro@...hat.com, steved@...hat.com
Subject: Re: [PATCH 19/19] CacheFiles: Permit daemon to probe inuseness of a cache file 

Christoph Hellwig <hch@...radead.org> wrote:

> Once again a very strong NACK for anything that gets a fd argument as
> text from userspace.

Why?  Would you rather I passed it in a struct to an ioctl?

> Also a very strong NACK for use of fget/fget_light from non-core code and
> exports for either of them.

Why?

I could possibly pass the pathname as text, except that (a) the path length
may exceed PAGE_SIZE and MAXPATHLEN, and (b) doing a full path lookup() is a
complete waste of time as the daemon already has the directory open on a file
descriptor, and so effectively has a bookmark to the location that I can use,
if I can but get hold of it.

David
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