linux-kernel - Re: [RFC/PATCH 4/8] revoke: core code V7

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Message-ID: <20080115172741.GA20388@infradead.org>
Date:	Tue, 15 Jan 2008 17:27:41 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>, alan@...hat.com,
	viro@...iv.linux.org.uk, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC/PATCH 4/8] revoke: core code V7

On Tue, Jan 15, 2008 at 04:14:54PM +0100, Peter Zijlstra wrote:
> Humm, we were trying to get rid of file_list_lock(), this puts up
> another user of the sb file list.
> 
> Also, that loop looks horribly expensive: n*(1+m); where n is the list
> size, and m the number of matching fds.
> 
> Granted, I see no other options either.

Something like the loop above is not going to go in for sure.  Once we
get rid of the sb->s_files we can put the list_head in struct file to
new use eventually if we don't want to get rid of it.  E.g. and
per-inode list would be much better than the per-superblock one and
would regularize what the tty driver is doing.

But I'm not too interesting in hashing out these details currently,
my primary concern is to get the per-mount r/o plus fallout like the
correct remount r/o and file_list_lock removal in and stable first.

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