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
|
/*
Copyright (C) 1994, 1997 Free Software Foundation
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <fcntl.h>
#include "priv.h"
#include "io_S.h"
/* Implement io_map as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_map (struct protid *cred,
memory_object_t *rdobj,
mach_msg_type_name_t *rdtype,
memory_object_t *wrobj,
mach_msg_type_name_t *wrtype)
{
int flags;
struct node *node;
if (!cred)
return EOPNOTSUPP;
*wrobj = *rdobj = MACH_PORT_NULL;
node = cred->po->np;
flags = cred->po->openstat & (O_READ | O_WRITE);
mutex_lock (&node->lock);
switch (flags)
{
case O_READ | O_WRITE:
*wrobj = *rdobj = diskfs_get_filemap (node, VM_PROT_READ |VM_PROT_WRITE);
if (*wrobj == MACH_PORT_NULL)
goto error;
mach_port_mod_refs (mach_task_self (), *rdobj, MACH_PORT_RIGHT_SEND, 1);
break;
case O_READ:
*rdobj = diskfs_get_filemap (node, VM_PROT_READ);
if (*rdobj == MACH_PORT_NULL)
goto error;
break;
case O_WRITE:
*wrobj = diskfs_get_filemap (node, VM_PROT_WRITE);
if (*wrobj == MACH_PORT_NULL)
goto error;
break;
}
mutex_unlock (&node->lock);
*rdtype = MACH_MSG_TYPE_MOVE_SEND;
*wrtype = MACH_MSG_TYPE_MOVE_SEND;
return 0;
error:
mutex_unlock (&node->lock);
return errno;
}
|
