particular that the filename is not prepended to the output
(the C<-b> option).
+=item $status = $h->fsck ($fstype, $device);
+
+This runs the filesystem checker (fsck) on C<device> which
+should have filesystem type C<fstype>.
+
+The returned integer is the status. See L<fsck(8)> for the
+list of status codes from C<fsck>, and note that multiple
+status codes can be summed together.
+
+It is entirely equivalent to running C<fsck -a -t fstype device>.
+Note that checking or repairing NTFS volumes is not supported
+(by linux-ntfs).
+
=item $autosync = $h->get_autosync ();
Get the autosync flag.
=item $h->set_autosync ($autosync);
If C<autosync> is true, this enables autosync. Libguestfs will make a
-best effort attempt to run C<$h-E<gt>sync> when the handle is closed
+best effort attempt to run C<$h-E<gt>umount_all> followed by
+C<$h-E<gt>sync> when the handle is closed
(also if the program exits without closing handles).
+This is disabled by default (except in guestfish where it is
+enabled by default).
+
=item $h->set_busy ();
This sets the state to C<BUSY>. This is only used when implementing