linux-kernel - Re: [PATCH] jfs: Add splice support

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Message-ID: <20061031084604.GB14055@kernel.dk>
Date:	Tue, 31 Oct 2006 09:46:04 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Dave Kleikamp <shaggy@...tin.ibm.com>,
	Daniel Drake <ddrake@...ntes3d.com>, axboe@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] jfs: Add splice support

On Tue, Oct 31 2006, Jan Engelhardt wrote:
> 
> >> This allows the splice() and tee() syscalls to be used with JFS.
> >
> >Gosh, that was easy.  Why couldn't I do that?  :-)
> 
> You could add it to all the other filesystems that lack it. (Cautionary 
> question: Does that work at an instant like it did with jfs?)
> 
> Seems like only ext[234] gfs2 reiserfs and xfs have splice_read 
> currently.

If the file system uses the generic page cache functions for reading and
writing, it should be able to use the generic splice read/write
functions as well. If it doesn't, then more work is likely involved. In
short, check the .read/.write and .aio_read/.aio_write parts of the
file_operations[] structure. jfs uses the generic handlers, hence splice
support should just be the two-liner posted.

-- 
Jens Axboe

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