4 * Copyright (C) 2001 Cluster File Systems, Inc.
6 * This code is issued under the GNU General Public License.
7 * See the file COPYING in this distribution
10 #define OBD_SNAP_MAGIC 0xfffffff3 /* an unlikely block number */
12 #ifndef OBD_SNAP_DEVICENAME
13 #define OBD_SNAP_DEVICENAME "obdsnap"
16 /* ioctls for manipulating snapshots 40 - 60 */
17 #define OBD_SNAP_SETTABLE _IOWR('f', 40, long)
18 #define OBD_SNAP_PRINTTABLE _IOWR('f', 41, long)
19 #define OBD_SNAP_DELETE _IOWR('f', 42, long)
20 #define OBD_SNAP_RESTORE _IOWR('f', 43, long)
22 /* this is the obd device descriptor:
23 * - current snapshot ends up in first slot of this array
26 unsigned int snap_index; /* which snapshot index are we accessing */
30 void snap_use(int table_no, int snap_index) ;
31 void snap_unuse(int table_no, int snap_index) ;
32 int snap_is_used(int table_no, int snap_index) ;
33 int snap_table_attach(int tableno, int snap_index);