On Sep 4, 2013, at 3:51 PM, Giuseppe Fierro <[email protected]> wrote:

> Thanks,
> as I can see I misunderstood the meaning of "btrfs filesystem df" I
> was expecting that the 'df' has been to display free space remaining.

Check the archives, this is a long running issue that no one has particularly 
great answers for because what free space remains depends on future (unknown) 
usage of the file system. But I still think it's a worse problem to not report 
anything at all in btrfs fi df, considering the historical point of df is to 
show space available. And it's also not good that the regular df shows e.g. for 
raid1, twice the free space as the amount of data that can be saved to the 
volume.

Chris Murphy--
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