On Thu, Dec 10, 2009 at 08:53:08PM +0200, Benny Halevy wrote:
> On Dec. 10, 2009, 19:30 +0200, " J. Bruce Fields" <bfields@xxxxxxxxxxxxxx> wrote:
> > On Mon, Dec 07, 2009 at 11:32:10AM +0200, Benny Halevy wrote:
> >> +static __be32
> >> +nfsd4_getdevinfo(struct svc_rqst *rqstp,
> >> + struct nfsd4_compound_state *cstate,
> >> + struct nfsd4_pnfs_getdevinfo *gdp)
> >> +{
> >> + struct super_block *sb;
> >> + struct svc_export *exp = NULL;
> >> + u32 fsidv = gdp->gd_devid.fsid;
> >> + int status;
> >> +
> >> + dprintk("%s: layout_type %u dev_id %llx:%llx maxcnt %u\n",
> >> + __func__, gdp->gd_layout_type, gdp->gd_devid.fsid,
> >> + gdp->gd_devid.devid, gdp->gd_maxcount);
> >> +
> >> + status = nfserr_inval;
> >> + exp = rqst_exp_find(rqstp, FSID_NUM, &fsidv);
> >
> > As I said before, this seems to require an fsid= option on every pnfs
> > export. We shouldn't need that.
>
> If there a better way to get to the sb given the fsid?
> Since we don't have a current_fh for getdeviceinfo the alternative
> might be to map the deviceids to sb's in the generic layer.
Does the deviceid even need to persist over reboots? If not, then just
an index into an in-memory table might be good enough. If it does need
to persist, then I guess we should look at the filehandle-decoding code
for inspiration.
--b.
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