linux-ext4 - Re: [PATCH 01/02] ext2: reserve INCOMPAT

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Message-ID: <4EDEC4D2.7080100@tao.ma>
Date:	Wed, 07 Dec 2011 09:43:46 +0800
From:	Tao Ma <tm@....ma>
To:	Andreas Dilger <adilger@...mcloud.com>
CC:	Theodore Ts'o <tytso@....edu>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 01/02] ext2: reserve INCOMPAT_INLINEDATA feature flag

On 12/07/2011 08:13 AM, Andreas Dilger wrote:
> Reserve the EXT4_FEATURE_INCOMPAT_INLINEDATA feature flag for use
> with storing small file data in the i_blocks field (up to 60 bytes)
> and/or the large xattr space (after i_extra_isize, up to the large
> inode size).  On typical filesystems this can save 1-3% of the space,
> and more importantly it also avoids seeking to read the data block.
> 
> This will become increasingly important with bigalloc filesystems,
> since they consume a full cluster of blocks for each file, including
> small directories that could easily fit into the inode itself.
> 
> Signed-off-by: Andreas Dilger <adilger@...mcloud.com>
> Originally-by: Tao Ma <tm@....ma>
I am fine with it. Thanks.

Tao
> ---
>  lib/ext2fs/ext2_fs.h |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index 0f8cde8..6cf47f9 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -719,6 +719,7 @@ struct ext2_super_block {
>  #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
>  #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400
>  #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000
> +#define EXT4_FEATURE_INCOMPAT_INLINEDATA	0x2000 /* data in inode */
>  
>  #define EXT2_FEATURE_COMPAT_SUPP	0
>  #define EXT2_FEATURE_INCOMPAT_SUPP    (EXT2_FEATURE_INCOMPAT_FILETYPE| \

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