linux-kernel - Re: [PATCH 11/16] f2fs: add inode operations for special inodes

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Message-Id: <201210171222.13614.arnd@arndb.de>
Date:	Wed, 17 Oct 2012 12:22:13 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
Cc:	"'Changman Lee'" <cm224.lee@...il.com>,
	"'Vyacheslav Dubeyko'" <slava@...eyko.com>,
	viro@...iv.linux.org.uk, "'Theodore Ts'o'" <tytso@....edu>,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	chur.lee@...sung.com, cm224.lee@...sung.com,
	jooyoung.hwang@...sung.com
Subject: Re: [PATCH 11/16] f2fs: add inode operations for special inodes

On Wednesday 17 October 2012, Jaegeuk Kim wrote:
> As discussed with Dave, I propose the following items.
> 
> [In v2]
> - Extension list
>    : Mkfs supports configuring extensions by user, and that information
>      will be stored in the superblock.
>      I'll add a mount option to enable/disable using the extension list.
>      Instead, f2fs supports xattr to give a hint to any files.
>      After supporting this by VFS, it'll be removed.
> - The number of active logs
>   : For compatibility, on-disk layout supports max 16 logs.
>     Instead, f2fs supports configuring the number of active logs that
>     will be used by a mount option.
>     The option supports 2, 4, and 6 logs.
> - Section size
>   : Mkfs supports multiples of segments for a section, not power-of-two.
> 
> [Future optimization]
> - Data separation
>   : file access pattern
>   : Investigate the option to make large files erase block indirect rather than
>    part of the normal logs
>   : sub-page write avoidance

Ok, sounds good! I'll comment separately on the xattr optimization,
since I had some ideas on how to combine this with other optimizations.

	Arnd
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