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Date:	Sun, 6 Jun 2010 15:54:57 +0400
From:	Evgeniy Ivanov <lolkaantimat@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: ext2 and directory indexing

On Sun, Jun 6, 2010 at 3:29 PM, Evgeniy Ivanov <lolkaantimat@...il.com> wrote:
> Hello,
>
> I'm a bit confused by indexing and ext2. It looks like there is no
> hash code in ext2, but ext2_fs.h has EXT2_INDEX_FL (most confusing),
> EXT2_FEATURE_COMPAT_DIR_INDEX and some other HTree things, but
> EXT2_INDEX_FL and EXT2_FEATURE_COMPAT_DIR_INDEX  are not used
> anywhere.
> I have ext2 partition created with mkfs.ext2 and when I check this
> partition e2fsck converts some directories to the indexed format and
> sets EXT2_INDEX_FL/EXT3_INDEX_FL. But since I failed grep any usage of
> EXT2_INDEX_FL in fs/ext2 that code doesn't reset EXT2_INDEX_FL (some
> time ago I was suggested to make my ext2 implementation to reset this
> flag which looks correct for ext3, but not ext2). Is it expected
> behavior of e2fsck?
> Does ext2 have directory indexing support (should my implementation of
> ext2 do that)?
>

It looks like partitions formatted with mkfs.ext2 have dir_index flag
set. It's the reason why e2fsck sets EXT2_INDEX_FL. Is it ok, that
mkfs.ext2 sets this flag (it manly depends on answer on previous
question).



-- 
Evgeniy Ivanov
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