Does your application depend on, or report, free disk space? Re: F20 Self Contained Change: OS Installer Support for LVM Thin Provisioning

[Richard W.M. Jones]

On Fri, Jul 26, 2013 at 10:13:42PM +0200, Miloslav Trmač wrote:
> Hello all,
> with thin provisioning available, the total and free space values
> reported by a filesystem do not necessarily mean that that much space
> is _actually_ available (the actual backing storage may be smaller, or
> shared with other filesystems).
> 
> If your package reports disk space usage to users, and bases this on
> filesystem free space, please consider whether it might need to take
> LVM thin provisioning into account.

I guess virt-df could be such a package.

> The same applies if your package automatically allocates a certain
> proportion of the total or available space.
> 
> A quick way to check whether your package is likely to be affected, is
> to look for statfs() or statvfs() calls in C, or the equivalent in
> your higher-level library / programming language.

What code needs to be used in addition/instead?

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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