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  1. #1
    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?

  2. #2
    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.

  3. #3
    Join Date
    Feb 2005
    Posts
    599
    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

    Daniel

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