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Old 30th January 2007, 02:43 AM
enko Offline
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Join Date: Dec 2004
Posts: 69
Growing a loopback ext3fs

Hey guys. I've got a "filesystem" that's stored in a file, and I mount that file as an ext3 system.

How can I make it bigger? Anything special?
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Old 30th January 2007, 05:58 AM
Jman Offline
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Join Date: Mar 2004
Location: Minnesota, USA
Age: 31
Posts: 7,909
You would have to umount it, resize the file containing it, and run resize2fs or something. If you have the space you might create a new, larger loopback file, mount both, and copy data over.

Though back up, I'm not sure how this'll work.
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Old 30th January 2007, 06:38 AM
parish Offline
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Join Date: Feb 2005
Posts: 598
I have resized encrypted filesystems using this procedure several times without losing any data, but it's been a while since I've done it, so try it at your own peril. I would strongly advise making a backup copy of the file first...

The general outline:

du -m <filename> => to get size in Mb to use for seek value below
dd if=/dev/zero of=<filename> bs=1M seek=<size from above> count=<blocks to add>
e2fsck -f /dev/loop0 <=assuming loop device is loop0
resize2fs /dev/loop0

Using real values (I actually used K instead of M although I don't quite remember why):

% du -k swap_125
125220052 swap_125
% dd if=/dev/urandom of=swap_125 bs=1k seek=125220052 count=25000000
% e2fsck -f /dev/loop0
% resize2fs /dev/loop0

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ext3fs, growing, loopback

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