linux-ext4 - Re: [PATCH] e2fsprogs - pass1c terminates early if hard links

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Date:	Wed, 11 Apr 2007 05:51:47 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Jim Garlick <garlick@...l.gov>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] e2fsprogs - pass1c terminates early if hard links

On Apr 11, 2007  06:42 -0400, Theodore Tso wrote:
> We don't currently have a way to modify indirect blocks
> directly (although I may create that soon or patches would be
> greatfully accepted :-), and of course there is a similar issue with
> extents and extended attributes blocks.

Note that as part of the i_extra_isize e2fsck support we are adding
functions to manage EAs to libext2fs that could be used as the basis
for this.

> At the moment I'm assuming that e2fsprogs block allocation algorithms
> (which are not as sophisticated as what's in the kernel) aren't going
> to be changing.

I thought as much myself.

> If they change, you're right, they could break the test.
> At the minimum I should document where the numbers are coming
> from in the test.

At least the test would break and any change that caused it could be
seen immediately.

> I could imagine a debugfs extension where we could do things like:
> 
> set_var $shared_blk /dir4/quux block[0]
> set_inode_field /dir/foo block[0] $shared_blk
> set_inode_field /dir2/bar block[0] $shared_blk
> set_inode_field /dir3/baz block[0] $shared_blk
> 
> Of course the temptation then would be to start adding conditions,
> functions, maybe an entire tcl interpreter....   :-)

Yes, I thought of this too, and also the "let's build a full interpreted
language into debugfs" conclusion.  It wouldn't be fatal though - in
some cases it would be nice to have debugfs loop over inodes to fix some
unusual corruption.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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