Re: development APIs for used/free blocks information

[Dave Chinner <david@xxxxxxxxxxxxx>]

On Wed, Apr 27, 2016 at 12:54:24PM +0000, Benjamin Wirth wrote:
> Hello Dave,
> 
> Thanks for your response.
> 
> And I apologize, reading back my email I wasn't clear about what I
> was looking for.
> 
> I want to be able to query which blocks are free or used, not just
> the counts. In EXT I was able to use ext2fs_test_block_bitmap()
> for that. XFS has a BTree with the free extents ordered by block
> number which I was hoping to be able to access from user-space,
> but couldn't find any APIs for it (or the headers containing the
> structure definitions) in the xfsprogs-devel package. Am I trying
> to do something impossible here?

There are prototypes that need a bit of polishing to complete:

http://oss.sgi.com/archives/xfs/2016-04/msg00633.html

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx