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