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Re: [bug] Can't resize a hurd owned ext2 partition

From: Roland McGrath
Subject: Re: [bug] Can't resize a hurd owned ext2 partition
Date: Tue, 7 Aug 2001 23:16:02 -0400 (EDT)

> On Mon, Aug 06, 2001 at 11:34:06PM +0200, Jeroen Dekkers wrote:
> > If I resize a hurd-owned ext2 partition I get this error message:
> > 
> > block 295512 has no reference? Weird
> > 
> > When I looked it up with debugfs I found out that on that block a passive
> > translator is stored and parted doesn't know what to handle it.
> Ah, right.  It doesn't know how to handle it.  Nor do I.  Any docs?

I don't know of any documentation of the ext2fs format that explains this.
(But then I don't personally know of any actual documentation of the ext2fs
format at all.)  But it is pretty easy to see what to do from how e2fsck
handles it.

If the superblock s_creator_os field is set to EXT2_OS_HURD (1), then the
`reserved1' word in inodes is in fact the i_translator word, which is
either zero or the block number containing the passive translator setting.
If you use debugfs to display an inode on an ext2fs with creator_os set to
hurd, it displays the translator block number clearly.

This all seems like it should be pretty obvious from looking at e2fsprogs,
even for someone who knows nothing at all about the Hurd.

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