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Date: Mon, 15 Nov 2010 10:26:33 -0600
From: Eric Sandeen <sandeen@sandeen.net>
MIME-Version: 1.0
Subject: Re: Fwd: xfs - fixing wrong xfs size
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To: johahoff <jh@not-dark-yet.de>
Cc: xfs@oss.sgi.com

On 11/14/10 5:16 AM, johahoff wrote:
> 
>> You can use xfs_db to set it; or you could comment out the kernel
>> check... and mount readonly, and copy off the data you can get to?
> 
> I have got the same problem after recovering a xfs volume using ddrescue. It
> seems that the new 1 TB drive I dd'ed to is a few blocks short ...
> 
> I had a look at the xfs_db man page, but wasn't able to figure out which
> command would allow me to set the block count of the fs. Can you please give
> the appropriate commands? I think I'll be able to figure out the correct
> counts on my own.
> 
> Thanks a lot!
> 
> -Johannes

# xfs_db -w /dev/blah
xfs_db> sb 0
xfs_db> p
...
magicnum = 0x58465342
blocksize = 4096
dblocks = XXXXXX
...
xfs_db> w dblocks <NEW VALUE>
xfs_db> quit

You may have to do it for each of the superblocks but I think the first
should suffice.

If files reference the blocks past the device then of course you'll hit
errors trying to read them as well ...

-Eric

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