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

From: Arnd Bergmann
Date: Wed Oct 17 2012 - 08:22:26 EST

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.

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