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

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Date:	Fri, 11 Jan 2013 09:49:22 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	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

2013/1/11, Jan Kara <jack@...e.cz>:
> 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!
>
Okay, I see.
Thanks Jan!
> 								Honza
> --
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR
>
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