On Fri, 2007-06-08 at 17:27 -0600, Andreas Dilger wrote:
> On Jun 08, 2007 15:38 -0600, Lee Ward wrote:
> > > Other notes - in about Lustre 1.6.2 it will be possible to use the FIEMAP
> > > ioctl to help in efficiently preallocating space in the file for the
> > > ADIO_FCNTL_SET_DISKSPACE fcntl. That will avoid the need to read the
> > > whole file, and instead just get a list of allocated and unallocated
> > > extents back.
> >
> > There are no Lustre ioctl's of any kind implemented in liblustre. The
> > Lustre client driver takes them but just returns an error. Maybe my info
> > dated here? I admit it's been a coupe of months since I last looked at
> > this.
>
> Actually, it is possible for a catamount client to use llapi_file_create()
> to specify striping on a newly-created file, and that internally calls the
> ioctl that the Lustre ADIO driver as presented here calls explicitly.
In the code I have, calling the SYSIO supplied ioctl() routine in turn
calls llu_iop_ioctl(), which does not have cases for {set,get}stripe
operations.
Are you saying that there is a special llapi_file_create for the XT
machines that bypasses SYSIO?
[snip]
--Lee
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