Manage BlockDriverState lifecycle with refcnt, so bdrv_delete() is no longer public and should be called by bdrv_unref() if refcnt is decreased to 0. This is an identical change because effectively, there's no multiple reference of BDS now: no caller of bdrv_ref() yet, only bdrv_new() sets bs->refcnt to 1, so all bdrv_unref() now actually delete the BDS. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* Block layer snapshot related functions
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "block/snapshot.h"
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#include "block/block_int.h"
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int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
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const char *name)
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{
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QEMUSnapshotInfo *sn_tab, *sn;
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int nb_sns, i, ret;
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ret = -ENOENT;
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nb_sns = bdrv_snapshot_list(bs, &sn_tab);
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if (nb_sns < 0) {
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return ret;
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}
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for (i = 0; i < nb_sns; i++) {
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sn = &sn_tab[i];
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if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
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*sn_info = *sn;
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ret = 0;
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break;
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}
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}
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g_free(sn_tab);
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return ret;
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}
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int bdrv_can_snapshot(BlockDriverState *bs)
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{
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BlockDriver *drv = bs->drv;
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if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
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return 0;
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}
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if (!drv->bdrv_snapshot_create) {
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if (bs->file != NULL) {
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return bdrv_can_snapshot(bs->file);
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}
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return 0;
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}
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return 1;
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}
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int bdrv_snapshot_create(BlockDriverState *bs,
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QEMUSnapshotInfo *sn_info)
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{
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BlockDriver *drv = bs->drv;
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if (!drv) {
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return -ENOMEDIUM;
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}
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if (drv->bdrv_snapshot_create) {
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return drv->bdrv_snapshot_create(bs, sn_info);
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}
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if (bs->file) {
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return bdrv_snapshot_create(bs->file, sn_info);
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}
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return -ENOTSUP;
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}
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int bdrv_snapshot_goto(BlockDriverState *bs,
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const char *snapshot_id)
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{
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BlockDriver *drv = bs->drv;
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int ret, open_ret;
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if (!drv) {
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return -ENOMEDIUM;
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}
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if (drv->bdrv_snapshot_goto) {
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return drv->bdrv_snapshot_goto(bs, snapshot_id);
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}
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if (bs->file) {
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drv->bdrv_close(bs);
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ret = bdrv_snapshot_goto(bs->file, snapshot_id);
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open_ret = drv->bdrv_open(bs, NULL, bs->open_flags);
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if (open_ret < 0) {
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bdrv_unref(bs->file);
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bs->drv = NULL;
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return open_ret;
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}
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return ret;
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}
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return -ENOTSUP;
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}
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int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
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{
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BlockDriver *drv = bs->drv;
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if (!drv) {
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return -ENOMEDIUM;
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}
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if (drv->bdrv_snapshot_delete) {
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return drv->bdrv_snapshot_delete(bs, snapshot_id);
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}
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if (bs->file) {
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return bdrv_snapshot_delete(bs->file, snapshot_id);
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}
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return -ENOTSUP;
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}
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int bdrv_snapshot_list(BlockDriverState *bs,
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QEMUSnapshotInfo **psn_info)
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{
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BlockDriver *drv = bs->drv;
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if (!drv) {
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return -ENOMEDIUM;
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}
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if (drv->bdrv_snapshot_list) {
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return drv->bdrv_snapshot_list(bs, psn_info);
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}
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if (bs->file) {
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return bdrv_snapshot_list(bs->file, psn_info);
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}
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return -ENOTSUP;
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}
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int bdrv_snapshot_load_tmp(BlockDriverState *bs,
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const char *snapshot_name)
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{
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BlockDriver *drv = bs->drv;
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if (!drv) {
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return -ENOMEDIUM;
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}
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if (!bs->read_only) {
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return -EINVAL;
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}
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if (drv->bdrv_snapshot_load_tmp) {
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return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
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}
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return -ENOTSUP;
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}
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