linux-kernel - Re: [patch 0/3] add perform_write to a

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Date:	Mon, 4 Feb 2008 15:59:52 -0500
From:	Christoph Hellwig <hch@....de>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	hch@....de, npiggin@...e.de, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 0/3] add perform_write to a_ops

On Mon, Feb 04, 2008 at 09:52:06PM +0100, Miklos Szeredi wrote:
> Moving up to higher layers might not be possible, due to lock/unlock
> of i_mutex being inside generic_file_aio_write().

Well some bits can be moved up.  Here's my grand plan which I plan
to implement once I get some time for it (or let someone else do
if they beat me):

 - generic_segment_checks goes to fs/read_write.c before caling into
   the filesystem
 - dito for vfs_check_frozen
 - generic_write_checks is a suitable helper already
 - dito for remove_suid
 - dito for file_update_time
 - after that there's not a whole lot left in generic_file_aio_write,
   except for direct I/O handling which will probably be very fs-specific
   if you have your own buffered I/O code

generic_file_buffered_write is an almost trivial wrapper around what's
->perform_write in Nick's earlier patches and a helper for the syncing
activity.



> 
> But with fuse being the only user, it's not a huge issue duplicating
> some code.
> 
> Nick, were there any other candidates, that would want to use such an
> interface in the future?
> 
> Thanks,
> Miklos
> -
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