1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/* Return a file handle (for nfs server support)
Copyright (C) 1997,99,2002 Free Software Foundation, Inc.
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, data_t *fh, size_t *fh_len)
{
struct node *node;
union diskfs_fhandle *f;
if (! cred)
return EOPNOTSUPP;
if (! idvec_contains (cred->user->uids, 0))
return EPERM;
assert_backtrace (sizeof *f == sizeof f->bytes);
node = cred->po->np;
pthread_mutex_lock (&node->lock);
if (*fh_len < sizeof (union diskfs_fhandle))
*fh = mmap (0, sizeof (union diskfs_fhandle), PROT_READ|PROT_WRITE,
MAP_ANON, 0, 0);
*fh_len = sizeof *f;
f = (union diskfs_fhandle *) *fh;
memset (f, 0, sizeof *f);
f->data.cache_id = node->cache_id;
f->data.gen = node->dn_stat.st_gen;
pthread_mutex_unlock (&node->lock);
return 0;
}
|
