Re: resize online with ext3?

On Sat, 30 Dec 2006, Steinar H. Gunderson wrote:
> Theodore, since you probably know this from at least one side of the
> equation; how difficult do you think it would be to simply fix this in the
> ext2 EVMS plugin? In other words, how much work is there to
>
>  a) Determine if a file system is online resizeable, and
>  b) Resize it using the right ioctls
>
> Actually, b) could probably simply be handled by calling resize2fs like with
> offline resizing, but I'm not sure how one could detect if the user had a
> version capable of doing online resizing.

Well, to be completely paranoid, you would also need c) check that the 
kernel and/or resize2fs can do online resizing. However, one thing which 
I've wondered: why does the plugin refuse to expand at all?

Assuming the old versions of resize2fs would refuse to expand a mounted 
volume, why not just have the plugin warn before doing an online expand? 
After that, you could treat it identically to offline, and if 
resize2fs/the volume/linux can't do an online resize, the filesystem 
will just remain small.


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