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/* Return a file handle (for nfs server support)
Copyright (C) 1997, 1999 Free Software Foundation
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include "priv.h"
#include "fs_S.h"
#include "fhandle.h"
/* Return an NFS file handle for CRED in FH & FN_LEN. */
error_t
diskfs_S_file_getfh (struct protid *cred, char **fh, unsigned *fh_len)
{
struct node *node;
union diskfs_fhandle *f;
if (! cred)
return EOPNOTSUPP;
if (! idvec_contains (cred->user->uids, 0))
return EPERM;
assert (sizeof *f == sizeof f->bytes);
node = cred->po->np;
mutex_lock (&node->lock);
if (*fh_len < sizeof (struct diskfs_fhandle))
*fh = mmap (0, sizeof (struct diskfs_fhandle), PROT_READ|PROT_WRITE,
MAP_ANON, 0, 0);
*fh_len = sizeof *f;
f = (union diskfs_fhandle *) *fh;
bzero (f, sizeof *f);
f->data.cache_id = node->cache_id;
f->data.gen = node->dn_stat.st_gen;
mutex_unlock (&node->lock);
return 0;
}
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