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-rw-r--r--contrib/qemu/block/snapshot.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/contrib/qemu/block/snapshot.c b/contrib/qemu/block/snapshot.c
new file mode 100644
index 00000000000..6c6d9deea1f
--- /dev/null
+++ b/contrib/qemu/block/snapshot.c
@@ -0,0 +1,157 @@
+/*
+ * Block layer snapshot related functions
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "block/snapshot.h"
+#include "block/block_int.h"
+
+int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
+ const char *name)
+{
+ QEMUSnapshotInfo *sn_tab, *sn;
+ int nb_sns, i, ret;
+
+ ret = -ENOENT;
+ nb_sns = bdrv_snapshot_list(bs, &sn_tab);
+ if (nb_sns < 0) {
+ return ret;
+ }
+ for (i = 0; i < nb_sns; i++) {
+ sn = &sn_tab[i];
+ if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
+ *sn_info = *sn;
+ ret = 0;
+ break;
+ }
+ }
+ g_free(sn_tab);
+ return ret;
+}
+
+int bdrv_can_snapshot(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
+ return 0;
+ }
+
+ if (!drv->bdrv_snapshot_create) {
+ if (bs->file != NULL) {
+ return bdrv_can_snapshot(bs->file);
+ }
+ return 0;
+ }
+
+ return 1;
+}
+
+int bdrv_snapshot_create(BlockDriverState *bs,
+ QEMUSnapshotInfo *sn_info)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+ if (drv->bdrv_snapshot_create) {
+ return drv->bdrv_snapshot_create(bs, sn_info);
+ }
+ if (bs->file) {
+ return bdrv_snapshot_create(bs->file, sn_info);
+ }
+ return -ENOTSUP;
+}
+
+int bdrv_snapshot_goto(BlockDriverState *bs,
+ const char *snapshot_id)
+{
+ BlockDriver *drv = bs->drv;
+ int ret, open_ret;
+
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+ if (drv->bdrv_snapshot_goto) {
+ return drv->bdrv_snapshot_goto(bs, snapshot_id);
+ }
+
+ if (bs->file) {
+ drv->bdrv_close(bs);
+ ret = bdrv_snapshot_goto(bs->file, snapshot_id);
+ open_ret = drv->bdrv_open(bs, NULL, bs->open_flags);
+ if (open_ret < 0) {
+ bdrv_delete(bs->file);
+ bs->drv = NULL;
+ return open_ret;
+ }
+ return ret;
+ }
+
+ return -ENOTSUP;
+}
+
+int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+ if (drv->bdrv_snapshot_delete) {
+ return drv->bdrv_snapshot_delete(bs, snapshot_id);
+ }
+ if (bs->file) {
+ return bdrv_snapshot_delete(bs->file, snapshot_id);
+ }
+ return -ENOTSUP;
+}
+
+int bdrv_snapshot_list(BlockDriverState *bs,
+ QEMUSnapshotInfo **psn_info)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+ if (drv->bdrv_snapshot_list) {
+ return drv->bdrv_snapshot_list(bs, psn_info);
+ }
+ if (bs->file) {
+ return bdrv_snapshot_list(bs->file, psn_info);
+ }
+ return -ENOTSUP;
+}
+
+int bdrv_snapshot_load_tmp(BlockDriverState *bs,
+ const char *snapshot_name)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+ if (!bs->read_only) {
+ return -EINVAL;
+ }
+ if (drv->bdrv_snapshot_load_tmp) {
+ return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
+ }
+ return -ENOTSUP;
+}