linux-ext4 - Re: [RFC PATCH v2 18/21] ext4: add support for read_iter and write

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Message-ID: <4F7A4030.5020701@oracle.com>
Date:	Mon, 02 Apr 2012 19:11:28 -0500
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	"Ted Ts'o" <tytso@....edu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Zach Brown <zab@...bo.net>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org
Subject: Re: [RFC PATCH v2 18/21] ext4: add support for read_iter and write_iter

On 04/02/2012 05:45 PM, Dave Kleikamp wrote:
> On 04/02/2012 01:42 PM, Ted Ts'o wrote:
>> On Fri, Mar 30, 2012 at 10:43:45AM -0500, Dave Kleikamp wrote:
>>> use the generic .read_iter and .write_iter functions
>>
>> Potentially silly question --- why not use NULL pointer to mean
>> generic_file_read_iter and generic_file_write_iter?  Then you won't
>> have to patch a bunch of file systems to add the generic .read_iter
>> and .write_iter?
> 
> I'm  not very confident that generic_file_read_iter and
> generic_file_write_iter will work for every filesystem that I haven't
> yet touched. It should work if they use generic_aio_read and _write, but
> some have their own versions of those.

In fact, I just realized a big oversight on my part in that I have ext4
calling generic_file_write_iter(), when in fact, it should be doing the
equivalent of ext4_file_write(). If been chasing a bug assuming that
ext4 called generic_aio_write(). Sometimes I miss the obvious.

> 
> Shaggy
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