[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 10/11] snapshot: create bdrv_all_create_snapshot hel
From: |
Denis V. Lunev |
Subject: |
[Qemu-devel] [PATCH 10/11] snapshot: create bdrv_all_create_snapshot helper |
Date: |
Wed, 4 Nov 2015 20:19:41 +0300 |
to create snapshot for all loaded block drivers.
The patch also ensures proper locking.
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Kevin Wolf <address@hidden>
---
block/snapshot.c | 24 ++++++++++++++++++++++++
include/block/snapshot.h | 1 +
migration/savevm.c | 22 ++++++----------------
3 files changed, 31 insertions(+), 16 deletions(-)
diff --git a/block/snapshot.c b/block/snapshot.c
index e196c9b..15d2b8a 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -456,6 +456,8 @@ BlockDriverState *bdrv_all_find_vmstate_bs(void)
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs)) {
+ /* Do not change logic here without tweaking
+ * bdrv_all_create_snapshot below */
return bs;
}
aio_context_release(ctx);
@@ -467,3 +469,25 @@ void bdrv_unlock(BlockDriverState *bs)
{
aio_context_release(bdrv_get_aio_context(bs));
}
+
+int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState **bad)
+{
+ int err = 0;
+ BlockDriverState *bs = NULL;
+
+ while ((bs = bdrv_next(bs)) && err == 0) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bdrv_can_snapshot(bs)) {
+ err = bdrv_snapshot_create(bs, sn);
+ /* Tricky part here. First image contains VM state. The behavior
+ * is matched one in bdrv_all_find_vmstate_bs */
+ sn->vm_state_size = 0;
+ }
+ aio_context_release(ctx);
+ }
+
+ *bad = bs;
+ return err;
+}
diff --git a/include/block/snapshot.h b/include/block/snapshot.h
index 1f45f51..0a29b2d 100644
--- a/include/block/snapshot.h
+++ b/include/block/snapshot.h
@@ -90,5 +90,6 @@ int bdrv_all_find_snapshot(const char *name, BlockDriverState
**first_bad_bs);
BlockDriverState *bdrv_all_find_vmstate_bs(void);
void bdrv_unlock(BlockDriverState *bs);
+int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState **bad);
#endif
diff --git a/migration/savevm.c b/migration/savevm.c
index f8c727d..8db7895 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1251,12 +1251,11 @@ out:
void hmp_savevm(Monitor *mon, const QDict *qdict)
{
- BlockDriverState *bs, *bs1;
+ BlockDriverState *bs;
QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
int ret;
QEMUFile *f;
int saved_vm_running;
- uint64_t vm_state_size;
qemu_timeval tv;
struct tm tm;
const char *name = qdict_get_try_str(qdict, "name");
@@ -1322,7 +1321,7 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
goto the_end;
}
ret = qemu_savevm_state(f, &local_err);
- vm_state_size = qemu_ftell(f);
+ sn->vm_state_size = qemu_ftell(f);
qemu_fclose(f);
if (ret < 0) {
monitor_printf(mon, "%s\n", error_get_pretty(local_err));
@@ -1330,19 +1329,10 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
goto the_end;
}
- /* create the snapshots */
-
- bs1 = NULL;
- while ((bs1 = bdrv_next(bs1))) {
- if (bdrv_can_snapshot(bs1)) {
- /* Write VM state size only to the image that contains the state */
- sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
- ret = bdrv_snapshot_create(bs1, sn);
- if (ret < 0) {
- monitor_printf(mon, "Error while creating snapshot on '%s'\n",
- bdrv_get_device_name(bs1));
- }
- }
+ ret = bdrv_all_create_snapshot(sn, &bs);
+ if (ret < 0) {
+ monitor_printf(mon, "Error while creating snapshot on '%s'\n",
+ bdrv_get_device_name(bs));
}
the_end:
--
2.5.0
- [Qemu-devel] [PATCH 07/11] migration: reorder processing in hmp_savevm, (continued)
- [Qemu-devel] [PATCH 07/11] migration: reorder processing in hmp_savevm, Denis V. Lunev, 2015/11/04
- [Qemu-devel] [PATCH 05/11] snapshot: create bdrv_all_find_snapshot helper, Denis V. Lunev, 2015/11/04
- [Qemu-devel] [PATCH 08/11] migration: implement bdrv_all_find_vmstate_bs and bdrv_unlock helpers, Denis V. Lunev, 2015/11/04
- [Qemu-devel] [PATCH 09/11] migration: add missed aio_context_acquire for state writing/reading, Denis V. Lunev, 2015/11/04
- [Qemu-devel] [PATCH 06/11] migration: drop find_vmstate_bs check in hmp_delvm, Denis V. Lunev, 2015/11/04
- [Qemu-devel] [PATCH 11/11] monitor: add missed aio_context_acquire into vm_completion call, Denis V. Lunev, 2015/11/04
- [Qemu-devel] [PATCH 10/11] snapshot: create bdrv_all_create_snapshot helper,
Denis V. Lunev <=
- Re: [Qemu-devel] [PATCH 2.5 v5 0/11] dataplane snapshot fixes, Stefan Hajnoczi, 2015/11/06