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Re: RFC: lseek() extensions: SEEK_HOLE / SEEK_DATA with patch

On Mon, Aug 08, 2011 at 12:15:03AM +0000, David Holland wrote:
> On Sun, Aug 07, 2011 at 10:03:34PM +0200, Reinoud Zandijk wrote:
>  > > Even your example code does this: it seeks repeatedly, teleporting the
>  > > seek pointer all over the place for no reason, then does a bunch of
>  > > reads.
>  > > > So yes, it changes the file pointer too but thats a side-effect
>  > 
>  > See above; if it didn't change the file pointer then it would still work...
> But it does change the file pointer, and it shouldn't.

fwiw, this was covered by conversations the linux guys had about this interface.
If you do a search you should be able to find it (I think I just looked for
"SEEK_HOLE"), but the quick summary was that, yes seeking isn't (always)
 necessary but the API is being kept compatible with what Solaris does.  
Additionally, a suggestion was made to also add FIND_DATA and FIND_HOLE flags,
which don't adjust the file pointer.


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