gen/sync_volume_np.c

   1 /*
   2  * Copyright (c) 2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <System/sys/fsctl.h>
  27
  28 /*
  29  * Sync a mounted filesystem, without syncing others.
  30  * There are currently two flags that can be used:
  31  *
  32  * SYNC_VOLUME_FULLSYNC causes it to try to push the
  33  * data to the platter (otherwise, it just pushes it
  34  * to the disk drive, where it may remain in cache
  35  * for a while).
  36  *
  37  * SYNC_VOLUME_WAIT causes it to wait until the writes
  38  * have completed.  Otherwise, it'll return as soon
  39  * as the requests have been made.
  40  *
  41  * The functions are a simple wrapper for fsctl, and
  42  * return what it does.
  43  */
  44
  45 int
  46 sync_volume_np(const char *path, int flags) {
  47         int full_sync = 0;
  48         int terrno;
  49         int rv;
  50
  51         if (flags & SYNC_VOLUME_FULLSYNC)
  52                 full_sync |= FSCTL_SYNC_FULLSYNC;
  53
  54         if (flags & SYNC_VOLUME_WAIT)
  55                 full_sync |= FSCTL_SYNC_WAIT;
  56
  57         terrno = errno;
  58         rv = (fsctl(path, FSIOC_SYNC_VOLUME, &full_sync, 0) == -1) ? errno : 0;
  59         errno = terrno;
  60         return rv;
  61 }
  62
  63 int
  64 fsync_volume_np(int fd, int flags) {
  65         int full_sync = 0;
  66         int terrno;
  67         int rv;
  68
  69         if (flags & SYNC_VOLUME_FULLSYNC)
  70                 full_sync |= FSCTL_SYNC_FULLSYNC;
  71
  72         if (flags & SYNC_VOLUME_WAIT)
  73                 full_sync |= FSCTL_SYNC_WAIT;
  74
  75         terrno = errno;
  76         rv = (ffsctl(fd, FSCTL_SYNC_VOLUME, &full_sync, 0) == -1) ? errno : 0;
  77         errno = terrno;
  78         return rv;
  79 }
  80