* THE SOFTWARE.
*/
+#include "qemu/osdep.h"
#include "block/snapshot.h"
#include "block/block_int.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qerror.h"
+#include "qapi/qmp/qstring.h"
+#include "qemu/option.h"
QemuOptsList internal_snapshot_opts = {
.name = "snapshot",
if (!drv->bdrv_snapshot_create) {
if (bs->file != NULL) {
- return bdrv_can_snapshot(bs->file);
+ return bdrv_can_snapshot(bs->file->bs);
}
return 0;
}
return drv->bdrv_snapshot_create(bs, sn_info);
}
if (bs->file) {
- return bdrv_snapshot_create(bs->file, sn_info);
+ return bdrv_snapshot_create(bs->file->bs, sn_info);
}
return -ENOTSUP;
}
int bdrv_snapshot_goto(BlockDriverState *bs,
- const char *snapshot_id)
+ const char *snapshot_id,
+ Error **errp)
{
BlockDriver *drv = bs->drv;
int ret, open_ret;
if (!drv) {
+ error_setg(errp, "Block driver is closed");
return -ENOMEDIUM;
}
+
+ if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
+ error_setg(errp, "Device has active dirty bitmaps");
+ return -EBUSY;
+ }
+
if (drv->bdrv_snapshot_goto) {
- return drv->bdrv_snapshot_goto(bs, snapshot_id);
+ ret = drv->bdrv_snapshot_goto(bs, snapshot_id);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Failed to load snapshot");
+ }
+ return ret;
}
if (bs->file) {
+ BlockDriverState *file;
+ QDict *options = qdict_clone_shallow(bs->options);
+ QDict *file_options;
+ Error *local_err = NULL;
+
+ file = bs->file->bs;
+ /* Prevent it from getting deleted when detached from bs */
+ bdrv_ref(file);
+
+ qdict_extract_subqdict(options, &file_options, "file.");
+ QDECREF(file_options);
+ qdict_put_str(options, "file", bdrv_get_node_name(file));
+
drv->bdrv_close(bs);
- ret = bdrv_snapshot_goto(bs->file, snapshot_id);
- open_ret = drv->bdrv_open(bs, NULL, bs->open_flags, NULL);
+ bdrv_unref_child(bs, bs->file);
+ bs->file = NULL;
+
+ ret = bdrv_snapshot_goto(file, snapshot_id, errp);
+ open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err);
+ QDECREF(options);
if (open_ret < 0) {
- bdrv_unref(bs->file);
+ bdrv_unref(file);
bs->drv = NULL;
- return open_ret;
+ /* A bdrv_snapshot_goto() error takes precedence */
+ error_propagate(errp, local_err);
+ return ret < 0 ? ret : open_ret;
}
+
+ assert(bs->file->bs == file);
+ bdrv_unref(file);
return ret;
}
+ error_setg(errp, "Block driver does not support snapshots");
return -ENOTSUP;
}
Error **errp)
{
BlockDriver *drv = bs->drv;
+ int ret;
+
if (!drv) {
- error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
return -ENOMEDIUM;
}
if (!snapshot_id && !name) {
}
/* drain all pending i/o before deleting snapshot */
- bdrv_drain_all();
+ bdrv_drained_begin(bs);
if (drv->bdrv_snapshot_delete) {
- return drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp);
+ ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp);
+ } else if (bs->file) {
+ ret = bdrv_snapshot_delete(bs->file->bs, snapshot_id, name, errp);
+ } else {
+ error_setg(errp, "Block format '%s' used by device '%s' "
+ "does not support internal snapshot deletion",
+ drv->format_name, bdrv_get_device_name(bs));
+ ret = -ENOTSUP;
}
- if (bs->file) {
- return bdrv_snapshot_delete(bs->file, snapshot_id, name, errp);
- }
- error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
- drv->format_name, bdrv_get_device_name(bs),
- "internal snapshot deletion");
- return -ENOTSUP;
+
+ bdrv_drained_end(bs);
+ return ret;
}
-void bdrv_snapshot_delete_by_id_or_name(BlockDriverState *bs,
- const char *id_or_name,
- Error **errp)
+int bdrv_snapshot_delete_by_id_or_name(BlockDriverState *bs,
+ const char *id_or_name,
+ Error **errp)
{
int ret;
Error *local_err = NULL;
if (ret < 0) {
error_propagate(errp, local_err);
}
+ return ret;
}
int bdrv_snapshot_list(BlockDriverState *bs,
return drv->bdrv_snapshot_list(bs, psn_info);
}
if (bs->file) {
- return bdrv_snapshot_list(bs->file, psn_info);
+ return bdrv_snapshot_list(bs->file->bs, psn_info);
}
return -ENOTSUP;
}
BlockDriver *drv = bs->drv;
if (!drv) {
- error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
return -ENOMEDIUM;
}
if (!snapshot_id && !name) {
if (drv->bdrv_snapshot_load_tmp) {
return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp);
}
- error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
- drv->format_name, bdrv_get_device_name(bs),
- "temporarily load internal snapshot");
+ error_setg(errp, "Block format '%s' used by device '%s' "
+ "does not support temporarily loading internal snapshots",
+ drv->format_name, bdrv_get_device_name(bs));
return -ENOTSUP;
}
ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err);
}
- if (local_err) {
- error_propagate(errp, local_err);
+ error_propagate(errp, local_err);
+
+ return ret;
+}
+
+
+/* Group operations. All block drivers are involved.
+ * These functions will properly handle dataplane (take aio_context_acquire
+ * when appropriate for appropriate block drivers) */
+
+bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs)
+{
+ bool ok = true;
+ BlockDriverState *bs;
+ BdrvNextIterator it;
+
+ for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bdrv_is_inserted(bs) && !bdrv_is_read_only(bs)) {
+ ok = bdrv_can_snapshot(bs);
+ }
+ aio_context_release(ctx);
+ if (!ok) {
+ bdrv_next_cleanup(&it);
+ goto fail;
+ }
+ }
+
+fail:
+ *first_bad_bs = bs;
+ return ok;
+}
+
+int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs,
+ Error **err)
+{
+ int ret = 0;
+ BlockDriverState *bs;
+ BdrvNextIterator it;
+ QEMUSnapshotInfo sn1, *snapshot = &sn1;
+
+ for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bdrv_can_snapshot(bs) &&
+ bdrv_snapshot_find(bs, snapshot, name) >= 0) {
+ ret = bdrv_snapshot_delete_by_id_or_name(bs, name, err);
+ }
+ aio_context_release(ctx);
+ if (ret < 0) {
+ bdrv_next_cleanup(&it);
+ goto fail;
+ }
}
+fail:
+ *first_bad_bs = bs;
return ret;
}
+
+
+int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs,
+ Error **errp)
+{
+ int ret = 0;
+ BlockDriverState *bs;
+ BdrvNextIterator it;
+
+ for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bdrv_can_snapshot(bs)) {
+ ret = bdrv_snapshot_goto(bs, name, errp);
+ }
+ aio_context_release(ctx);
+ if (ret < 0) {
+ bdrv_next_cleanup(&it);
+ goto fail;
+ }
+ }
+
+fail:
+ *first_bad_bs = bs;
+ return ret;
+}
+
+int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs)
+{
+ QEMUSnapshotInfo sn;
+ int err = 0;
+ BlockDriverState *bs;
+ BdrvNextIterator it;
+
+ for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bdrv_can_snapshot(bs)) {
+ err = bdrv_snapshot_find(bs, &sn, name);
+ }
+ aio_context_release(ctx);
+ if (err < 0) {
+ bdrv_next_cleanup(&it);
+ goto fail;
+ }
+ }
+
+fail:
+ *first_bad_bs = bs;
+ return err;
+}
+
+int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
+ BlockDriverState *vm_state_bs,
+ uint64_t vm_state_size,
+ BlockDriverState **first_bad_bs)
+{
+ int err = 0;
+ BlockDriverState *bs;
+ BdrvNextIterator it;
+
+ for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bs == vm_state_bs) {
+ sn->vm_state_size = vm_state_size;
+ err = bdrv_snapshot_create(bs, sn);
+ } else if (bdrv_can_snapshot(bs)) {
+ sn->vm_state_size = 0;
+ err = bdrv_snapshot_create(bs, sn);
+ }
+ aio_context_release(ctx);
+ if (err < 0) {
+ bdrv_next_cleanup(&it);
+ goto fail;
+ }
+ }
+
+fail:
+ *first_bad_bs = bs;
+ return err;
+}
+
+BlockDriverState *bdrv_all_find_vmstate_bs(void)
+{
+ BlockDriverState *bs;
+ BdrvNextIterator it;
+
+ for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+ bool found;
+
+ aio_context_acquire(ctx);
+ found = bdrv_can_snapshot(bs);
+ aio_context_release(ctx);
+
+ if (found) {
+ bdrv_next_cleanup(&it);
+ break;
+ }
+ }
+ return bs;
+}
projects / qemu.git / blobdiff