mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-21 22:53:37 +00:00
d2636b0984
Instead of explicitly calling umount-all; sync, we add a daemon function called internal-autosync which does the same. Apart from slightly simplifying the process of closing the handle, the main advantage is we can modify the daemon for the standalone case so that internal-autosync does not do the umount-all operation.
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#ifdef HAVE_WINDOWS_H
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#include <windows.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include "daemon.h"
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#include "actions.h"
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#ifdef WIN32
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static int sync_win32 (void);
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#endif
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int
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do_sync (void)
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{
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if (sync_disks () == -1) {
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reply_with_perror ("sync");
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return -1;
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}
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return 0;
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}
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/* Older versions of libguestfs used to issue separate 'umount_all'
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* and 'sync' commands just before closing the handle. Since
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* libguestfs 1.9.7 the library issues this 'internal_autosync'
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* internal operation instead, allowing more control in the daemon.
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*/
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int
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do_internal_autosync (void)
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{
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int r;
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r = do_umount_all ();
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sync_disks ();
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return r;
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}
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/* This is a replacement for sync(2) which is called from
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* this file and from other places in the daemon. It works
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* on Windows too.
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*/
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int
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sync_disks (void)
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{
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#if defined(HAVE_SYNC)
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sync ();
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return 0;
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#elif defined(WIN32)
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return sync_win32 ();
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#else
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#error "no known sync() API"
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#endif
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}
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#ifdef WIN32
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static int
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sync_win32 (void)
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{
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DWORD n1, n2;
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n1 = GetLogicalDriveStrings (0, NULL);
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if (n1 == 0)
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return -1;
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TCHAR buffer[n1+2]; /* sic */
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n2 = GetLogicalDriveStrings (n1, buffer);
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if (n2 == 0)
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return -1;
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TCHAR *p = buffer;
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/* The MSDN example code itself assumes that there is always one
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* drive in the system. However we will be better than that and not
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* make the assumption ...
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*/
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while (*p) {
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HANDLE drive;
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DWORD drive_type;
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if (verbose)
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fprintf (stderr, "sync_win32: examining drive %s\n", p);
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/* Ignore removable drives. */
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drive_type = GetDriveType (p);
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if (drive_type == DRIVE_FIXED) {
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/* To open the volume you have to specify the volume name, not
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* the mount point. MSDN documents use of the constant 50
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* below.
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*/
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TCHAR volname[50];
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if (!GetVolumeNameForVolumeMountPoint (p, volname, 50))
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return -1;
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drive = CreateFile (volname, GENERIC_READ|GENERIC_WRITE,
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FILE_SHARE_READ|FILE_SHARE_WRITE,
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NULL, OPEN_EXISTING, 0, 0);
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if (drive == INVALID_HANDLE_VALUE)
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return -1;
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if (verbose)
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fprintf (stderr, "sync_win32: flushing %s\n", volname);
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BOOL r;
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/* This always fails in Wine:
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* http://bugs.winehq.org/show_bug.cgi?id=14915
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*/
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r = FlushFileBuffers (drive);
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CloseHandle (drive);
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if (!r)
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return -1;
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}
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/* Skip to next \0 character. */
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while (*p++);
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}
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return 0;
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}
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#endif /* WIN32 */
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