linux-ext4 - Re: Initial results of FLEX

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Message-ID: <20070711221425.GH19456@thunk.org>
Date:	Wed, 11 Jul 2007 18:14:25 -0400
From:	Theodore Tso <tytso@....edu>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	Andreas Dilger <adilger@...sterfs.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Initial results of FLEX_BG feature.

On Wed, Jul 11, 2007 at 12:30:04AM -0500, Jose R. Santos wrote:
> Right now what I've done is allocate the bitmaps and inode tables at the
> beginning of each group of 64 BG.  Still need to work on fsck since just
> removing the restriction on were the bitmaps and inode table are
> located still gives me errors of uninitialized inodes with dtime set.
> Seems like fsck still expect inode information to be located at
> specific locations within the disk.

Can you send me the patch which you were playing with?  I might be
able to help you with this.  It should be pretty straightforward to
remove the constraint on the inode table location.  

It really should only be a check in e2fsck/super.c:check_super_block(),
as far as I know.

If you're seeing errors of unitialized inodes with dtime set, that
sounds like maybe something else is going on.  All of e2fsprogs should
be referencing the inode table via fs->group_desc[group_num].bg_inode_table.  
See lib/ext2fs/inode.c, functions ext2fs_open_inode_scan(), 
get_next_blockgroup(), and ext2fs_read_inode_full().

							- Ted
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