linux-kernel - Re: [PATCH 00/16] f2fs: introduce flash-friendly file system

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Message-ID: <CAKYAXd9+fEVUhe7kRcv_CnWhH3z_e4NqPstSWoCQ6xqrSt4AyQ@mail.gmail.com>
Date:	Wed, 17 Oct 2012 20:13:57 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Changman Lee <cm224.lee@...il.com>
Cc:	Jaegeuk Kim <jaegeuk.kim@...sung.com>,
	Vyacheslav Dubeyko <slava@...eyko.com>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Jaegeuk Kim <jaegeuk.kim@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"tytso@....edu" <tytso@....edu>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"chur.lee@...sung.com" <chur.lee@...sung.com>,
	"cm224.lee@...sung.com" <cm224.lee@...sung.com>,
	"jooyoung.hwang@...sung.com" <jooyoung.hwang@...sung.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 00/16] f2fs: introduce flash-friendly file system

2012/10/11, Changman Lee <cm224.lee@...il.com>:
> 2012년 10월 11일 목요일에 Namjae Jeon<linkinjeon@...il.com>님이 작성:
>> 2012/10/10 Jaegeuk Kim <jaegeuk.kim@...sung.com>:
>>
>>>>
>>>> I mean that every volume is placed inside any partition (MTD or GPT).
> Every partition begins from any
>>>> physical sector. So, as I can understand, f2fs volume can begin from
> physical sector that is laid
>>>> inside physical erase block. Thereby, in such case of formating the
> f2fs's operation units will be
>>>> unaligned in relation of physical erase blocks, from my point of view.
> Maybe, I misunderstand
>>>> something but it can lead to additional FTL operations and performance
> degradation, from my point of
>>>> view.
>>>
>>> I think mkfs already calculates the offset to align that.
>> I think this answer is not what he want.
>> If you don't use partition table such as dos partition table or gpt, I
>> think that it is possible to align using mkfs.
>> But If we should consider partition table space in storage, I don't
>> understand how it  could be align using mkfs.
>>
>> Thanks.
>
> We can know the physical starting sector address of any partitions from
> hdio geometry information got by ioctl.
If so, first block and end block of partition are useless ?

Thanks.
>
>>> Thanks,
>>>
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