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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/* Return the file for a given handle (for nfs server support)
Copyright (C) 1997 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 <fcntl.h>
#include "priv.h"
#include "fsys_S.h"
#include "fhandle.h"
/* Return in FILE & FILE_TYPE the file in FSYS corresponding to the NFS file
handle HANDLE & HANDLE_LEN. */
error_t
diskfs_S_fsys_getfile (mach_port_t fsys,
mach_port_t reply, mach_msg_type_name_t reply_type,
uid_t *uids, mach_msg_type_number_t nuids,
gid_t *gids, mach_msg_type_number_t ngids,
char *handle, mach_msg_type_number_t handle_len,
mach_port_t *file, mach_msg_type_name_t *file_type)
{
int flags;
error_t err;
struct node *node;
struct diskfs_fhandle *f;
struct protid *new_cred;
struct idvec *uvec, *gvec;
struct iouser *user;
struct port_info *pt =
ports_lookup_port (diskfs_port_bucket, fsys, diskfs_control_class);
if (!pt)
return EOPNOTSUPP;
if (handle_len != sizeof (struct diskfs_fhandle))
{
ports_port_deref (pt);
return EINVAL;
}
f = (struct diskfs_fhandle *) handle;
err = diskfs_cached_lookup (f->cache_id, &node);
if (err)
{
ports_port_deref (pt);
return err;
}
if (node->dn_stat.st_gen != f->gen)
{
diskfs_nput (node);
ports_port_deref (pt);
return ESTALE;
}
uvec = make_idvec ();
gvec = make_idvec ();
idvec_set_ids (uvec, uids, nuids);
idvec_set_ids (gvec, gids, ngids);
user = iohelp_create_iouser (uvec, gvec);
flags = 0;
if (! fshelp_access (&node->dn_stat, S_IREAD, user))
flags |= O_READ;
if (! fshelp_access (&node->dn_stat, S_IEXEC, user))
flags |= O_EXEC;
if (! fshelp_access (&node->dn_stat, S_IWRITE, user)
&& ! S_ISDIR (node->dn_stat.st_mode)
&& ! diskfs_check_readonly ())
flags |= O_WRITE;
err = diskfs_create_protid (diskfs_make_peropen (node, flags,
MACH_PORT_NULL, 0),
user, &new_cred);
iohelp_free_iouser (user);
diskfs_nput (node);
ports_port_deref (pt);
if (! err)
{
*file = ports_get_right (new_cred);
*file_type = MACH_MSG_TYPE_MAKE_SEND;
}
return err;
}
|
