linux-kernel - Re: [PATCH 5/6] udf: implement extent caching while reading-writing to a file

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Date:	Thu, 10 Jan 2013 17:59:42 +0100
From:	Jan Kara <jack@...e.cz>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ashish Sangwan <a.sangwan@...sung.com>
Subject: Re: [PATCH 5/6] udf: implement extent caching while
 reading-writing to a file

On Wed 09-01-13 15:26:43, Namjae Jeon wrote:
> 2012/12/13, Namjae Jeon <linkinjeon@...il.com>:
> > 2012/10/19, Namjae Jeon <linkinjeon@...il.com>:
> >> 2012/10/19, Jan Kara <jack@...e.cz>:
> >>>   Hello,
> >>>
> >>> On Wed 10-10-12 00:10:01, Namjae Jeon wrote:
> >>>> From: Namjae Jeon <namjae.jeon@...sung.com>
> >>>>
> >>>> This patch implements extent caching.
> >>>> Instead of reading metadata everytime from file's starting position,
> >>>> now we read from the cached extent.
> >>>> This speeds up the transformation of file logical offsets to
> >>>> corresponding on-disk blocks.
> >>>   I have some mostly minor comments to the patch. But when reading the
> >>> extent code it is just ugly and hard to follow. So I'm thinking how to
> >>> improve that before making things even harder with the extent cache. So
> >>> give me a few more days please.
> >> Hi Jan.
> >> Okay, I see. Thanks!
> >>>
> > Hi Jan.
> > Sorry for interrupt. I am still waiting for your review.
> > Would you check extent cache patches ?
> > Thanks.
> Hi Jan.
> 
> Maybe You think you didn't convince extent cache implementation of
> write part in this patch.
> So I suggest that once, we add extent cache of read part first in case
> of read-only mount type.
> because it is real issue on 3D BD-disk playing(BD Disk is used on
> read-only mount type).
> And I will check more write part again.
  I'm sorry for not getting to you earlier. Yes, support for reading should
be easy enough and we can add support for write when I finish the extent
cleanup (I already have the new code written but I need to integrate it
with the rest of UDF code...). Can you please send the patch for read
support and I'll queue it for the next merge window? Thanks!

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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