LXR qemu/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
  34extern QemuOptsList internal_snapshot_opts;
  35
  36typedef 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} QEMUSnapshotInfo;
  46
  47int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
  48                       const char *name);
  49bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs,
  50                                       const char *id,
  51                                       const char *name,
  52                                       QEMUSnapshotInfo *sn_info,
  53                                       Error **errp);
  54int bdrv_can_snapshot(BlockDriverState *bs);
  55int bdrv_snapshot_create(BlockDriverState *bs,
  56                         QEMUSnapshotInfo *sn_info);
  57int bdrv_snapshot_goto(BlockDriverState *bs,
  58                       const char *snapshot_id,
  59                       Error **errp);
  60int bdrv_snapshot_delete(BlockDriverState *bs,
  61                         const char *snapshot_id,
  62                         const char *name,
  63                         Error **errp);
  64int bdrv_snapshot_list(BlockDriverState *bs,
  65                       QEMUSnapshotInfo **psn_info);
  66int bdrv_snapshot_load_tmp(BlockDriverState *bs,
  67                           const char *snapshot_id,
  68                           const char *name,
  69                           Error **errp);
  70int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
  71                                         const char *id_or_name,
  72                                         Error **errp);
  73
  74
  75/* Group operations. All block drivers are involved.
  76 * These functions will properly handle dataplane (take aio_context_acquire
  77 * when appropriate for appropriate block drivers */
  78
  79bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs);
  80int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bsd_bs,
  81                             Error **err);
  82int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs,
  83                           Error **errp);
  84int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs);
  85int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
  86                             BlockDriverState *vm_state_bs,
  87                             uint64_t vm_state_size,
  88                             BlockDriverState **first_bad_bs);
  89
  90BlockDriverState *bdrv_all_find_vmstate_bs(void);
  91
  92#endif
  93