On Tue, May 17, 2005 at 12:01:05AM +0200, Arnd Bergmann wrote:
> On Maandag 16 Mai 2005 22:58, Greg KH wrote:
> > On Sat, May 14, 2005 at 03:05:06PM +0200, Arnd Bergmann wrote:
>
> > > 2. sys_spufs_run(int fd, __u32 pc, __u32 *new_pc, __u32 *status):
> > > pro:
> > > - strong types
> > > - can have both input and output arguments
> > > contra:
> > > - does not fit file system semantics well
> > > - bad for prototyping
> >
> > I suggest you do this. Based on what you say you want the code to do, I
> > agree, write() doesn't really work out well
>
> The syscall approach has another small disadvantage in that I need to
> do a callback registration mechanism for it if I want to have spufs as
> a loadable module. I could of course require spufs to be builtin, but
> that complicates prototype testing (as mentioned) and enlarges combined
> pSeries/powermac/BPA distro kernels.
Huh? We can handle syscalls in modules these days pretty simply. Look
at how nfs and others do it.
> I think I'll leave the ioctl for now and add a note saying that I need
> to replace it with a syscall or the write/read or lseek/read based
> approach when I arrive at a more feature complete point.
Nah, make it a syscall :)
> > (but it might, and if you
> > want an example of how to do it, look at the ibmasm driver, it
> > implements write() in a way much like what you are wanting to do.)
>
> That would be the same write/read combination as Ben's second
> proposal and the nfsctl file system, right?
Yes.
> > > My solution was to force the dentries in each directory to be
> > > present. When the directory is created, the files are already
> > > there and unlinking a single file is impossible. To destroy the
> > > spu context, the user has to rmdir it, which will either remove
> > > all files in there as well or fail in the case that any file is
> > > still open.
> >
> > Ick.
> >
> > > Of course that is not really Posix behavior, but it avoids some
> > > other pitfalls.
> >
> > Go with a syscall :)
>
> Sorry, I'm not following that reasoning. How does a syscall help
> with the problem of atomic context destruction?
Sorry, I thought they were referring to the same issue.
greg k-h
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