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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* 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 of the License, 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 <config.h>
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include "daemon.h"
#include "actions.h"
#ifdef WIN32
static int sync_win32 (void);
#endif
int
do_sync (void)
{
if (sync_disks () == -1) {
reply_with_perror ("sync");
return -1;
}
return 0;
}
/* Older versions of libguestfs used to issue separate 'umount_all'
* and 'sync' commands just before closing the handle. Since
* libguestfs 1.9.7 the library issues this 'internal_autosync'
* internal operation instead, allowing more control in the daemon.
*/
int
do_internal_autosync (void)
{
int r = 0;
if (autosync_umount)
r = do_umount_all ();
sync_disks ();
return r;
}
/* This is a replacement for sync(2) which is called from
* this file and from other places in the daemon. It works
* on Windows too.
*/
int
sync_disks (void)
{
#if defined(HAVE_SYNC)
sync ();
return 0;
#elif defined(WIN32)
return sync_win32 ();
#else
#error "no known sync() API"
#endif
}
#ifdef WIN32
static int
sync_win32 (void)
{
DWORD n1, n2;
n1 = GetLogicalDriveStrings (0, NULL);
if (n1 == 0)
return -1;
TCHAR buffer[n1+2]; /* sic */
n2 = GetLogicalDriveStrings (n1, buffer);
if (n2 == 0)
return -1;
TCHAR *p = buffer;
/* The MSDN example code itself assumes that there is always one
* drive in the system. However we will be better than that and not
* make the assumption ...
*/
while (*p) {
HANDLE drive;
DWORD drive_type;
if (verbose)
fprintf (stderr, "sync_win32: examining drive %s\n", p);
/* Ignore removable drives. */
drive_type = GetDriveType (p);
if (drive_type == DRIVE_FIXED) {
/* To open the volume you have to specify the volume name, not
* the mount point. MSDN documents use of the constant 50
* below.
*/
TCHAR volname[50];
if (!GetVolumeNameForVolumeMountPoint (p, volname, 50))
return -1;
drive = CreateFile (volname, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, 0);
if (drive == INVALID_HANDLE_VALUE)
return -1;
if (verbose)
fprintf (stderr, "sync_win32: flushing %s\n", volname);
BOOL r;
/* This always fails in Wine:
* http://bugs.winehq.org/show_bug.cgi?id=14915
*/
r = FlushFileBuffers (drive);
CloseHandle (drive);
if (!r)
return -1;
}
/* Skip to next \0 character. */
while (*p++);
}
return 0;
}
#endif /* WIN32 */
|
