Re: [Question] how to know which blocks are used?

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Tue, May 17, 2005 at 11:45:19AM +0800, weafon wrote:
> Hi,
> I am writing a code for copying the XFS-format disk to another space disk. 
> The code is run without the support of XFS lib. 
> That is, the code has to read the structure of XFS by itself.
> 
> I went to know which block is used because I only plan to copy the used block 
> for saving time.

xfs_copy is doing exactly that.  Either use it or look at it what it does.