include/block/snapshot.h

   1 /*
   2  * Block layer snapshot related functions
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #ifndef SNAPSHOT_H
  26 #define SNAPSHOT_H
  27
  28
  29
  30 #define SNAPSHOT_OPT_BASE       "snapshot."
  31 #define SNAPSHOT_OPT_ID         "snapshot.id"
  32 #define SNAPSHOT_OPT_NAME       "snapshot.name"
  33
  34 extern QemuOptsList internal_snapshot_opts;
  35
  36 typedef struct QEMUSnapshotInfo {
  37     char id_str[128]; /* unique snapshot id */
  38     /* the following fields are informative. They are not needed for
  39        the consistency of the snapshot */
  40     char name[256]; /* user chosen name */
  41     uint64_t vm_state_size; /* VM state info size */
  42     uint32_t date_sec; /* UTC date of the snapshot */
  43     uint32_t date_nsec;
  44     uint64_t vm_clock_nsec; /* VM clock relative to boot */
  45     uint64_t icount; /* record/replay step */
  46 } QEMUSnapshotInfo;
  47
  48 int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
  49                        const char *name);
  50 bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs,
  51                                        const char *id,
  52                                        const char *name,
  53                                        QEMUSnapshotInfo *sn_info,
  54                                        Error **errp);
  55 int bdrv_can_snapshot(BlockDriverState *bs);
  56 int bdrv_snapshot_create(BlockDriverState *bs,
  57                          QEMUSnapshotInfo *sn_info);
  58 int bdrv_snapshot_goto(BlockDriverState *bs,
  59                        const char *snapshot_id,
  60                        Error **errp);
  61 int bdrv_snapshot_delete(BlockDriverState *bs,
  62                          const char *snapshot_id,
  63                          const char *name,
  64                          Error **errp);
  65 int bdrv_snapshot_list(BlockDriverState *bs,
  66                        QEMUSnapshotInfo **psn_info);
  67 int bdrv_snapshot_load_tmp(BlockDriverState *bs,
  68                            const char *snapshot_id,
  69                            const char *name,
  70                            Error **errp);
  71 int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
  72                                          const char *id_or_name,
  73                                          Error **errp);
  74
  75
  76 /* Group operations. All block drivers are involved.
  77  * These functions will properly handle dataplane (take aio_context_acquire
  78  * when appropriate for appropriate block drivers */
  79
  80 bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs);
  81 int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bsd_bs,
  82                              Error **errp);
  83 int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs,
  84                            Error **errp);
  85 int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs);
  86 int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
  87                              BlockDriverState *vm_state_bs,
  88                              uint64_t vm_state_size,
  89                              BlockDriverState **first_bad_bs);
  90
  91 BlockDriverState *bdrv_all_find_vmstate_bs(void);
  92
  93 #endif