Re: What to do about df and btrfs fi df

[Roger Binns <rogerb@rogerbinns.com>]

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On 10/02/14 10:24, cwillu wrote:
> The regular df data used number should be the amount of space required 
> to hold a backup of that content (assuming that the backup maintains 
> reflinks and compression and so forth).
> 
> There's no good answer for available space;

I think the flipside of the above works well.  How large a group of files
can you expect to create before you will get ENOSPC?

That for example is the check code does that looks at df - "I need to put
in XGB of files - will it fit?"  It is also what users do.

This is also what NTFS under Windows does with compression.  If it says
you have 5GB of space left then you will be able to put in 5GB of
uncompressible files.  Of course if they are compressible then you don't
end up consuming all the free space.

Roger

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