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[PATCH v10 03/12] migration: stop returning errno from load_snapshot()
From: |
Daniel P . Berrangé |
Subject: |
[PATCH v10 03/12] migration: stop returning errno from load_snapshot() |
Date: |
Tue, 2 Feb 2021 15:41:29 +0000 |
None of the callers care about the errno value since there is a full
Error object populated. This gives consistency with save_snapshot()
which already just returns a boolean value.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
[PMD: Return false/true instead of -1/0, document function]
Acked-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
include/migration/snapshot.h | 10 +++++++++-
migration/savevm.c | 19 +++++++++----------
monitor/hmp-cmds.c | 2 +-
replay/replay-snapshot.c | 2 +-
softmmu/vl.c | 2 +-
5 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/include/migration/snapshot.h b/include/migration/snapshot.h
index 0eaf1ba0b1..d7d210820c 100644
--- a/include/migration/snapshot.h
+++ b/include/migration/snapshot.h
@@ -23,6 +23,14 @@
* On failure, store an error through @errp and return %false.
*/
bool save_snapshot(const char *name, Error **errp);
-int load_snapshot(const char *name, Error **errp);
+
+/**
+ * load_snapshot: Load an internal snapshot.
+ * @name: name of internal snapshot
+ * @errp: pointer to error object
+ * On success, return %true.
+ * On failure, store an error through @errp and return %false.
+ */
+bool load_snapshot(const char *name, Error **errp);
#endif
diff --git a/migration/savevm.c b/migration/savevm.c
index ef7963f6c9..e6972b56b3 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2930,7 +2930,7 @@ void qmp_xen_load_devices_state(const char *filename,
Error **errp)
migration_incoming_state_destroy();
}
-int load_snapshot(const char *name, Error **errp)
+bool load_snapshot(const char *name, Error **errp)
{
BlockDriverState *bs_vm_state;
QEMUSnapshotInfo sn;
@@ -2940,16 +2940,16 @@ int load_snapshot(const char *name, Error **errp)
MigrationIncomingState *mis = migration_incoming_get_current();
if (!bdrv_all_can_snapshot(errp)) {
- return -ENOTSUP;
+ return false;
}
ret = bdrv_all_find_snapshot(name, errp);
if (ret < 0) {
- return ret;
+ return false;
}
bs_vm_state = bdrv_all_find_vmstate_bs(errp);
if (!bs_vm_state) {
- return -ENOTSUP;
+ return false;
}
aio_context = bdrv_get_aio_context(bs_vm_state);
@@ -2958,11 +2958,11 @@ int load_snapshot(const char *name, Error **errp)
ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
aio_context_release(aio_context);
if (ret < 0) {
- return ret;
+ return false;
} else if (sn.vm_state_size == 0) {
error_setg(errp, "This is a disk-only snapshot. Revert to it "
" offline using qemu-img");
- return -EINVAL;
+ return false;
}
/*
@@ -2983,7 +2983,6 @@ int load_snapshot(const char *name, Error **errp)
f = qemu_fopen_bdrv(bs_vm_state, 0);
if (!f) {
error_setg(errp, "Could not open VM state file");
- ret = -EINVAL;
goto err_drain;
}
@@ -3003,14 +3002,14 @@ int load_snapshot(const char *name, Error **errp)
if (ret < 0) {
error_setg(errp, "Error %d while loading VM state", ret);
- return ret;
+ return false;
}
- return 0;
+ return true;
err_drain:
bdrv_drain_all_end();
- return ret;
+ return false;
}
void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 95fd6eec98..8022e52b28 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -1130,7 +1130,7 @@ void hmp_loadvm(Monitor *mon, const QDict *qdict)
vm_stop(RUN_STATE_RESTORE_VM);
- if (load_snapshot(name, &err) == 0 && saved_vm_running) {
+ if (!load_snapshot(name, &err) && saved_vm_running) {
vm_start();
}
hmp_handle_error(mon, err);
diff --git a/replay/replay-snapshot.c b/replay/replay-snapshot.c
index 4f2560d156..b289365937 100644
--- a/replay/replay-snapshot.c
+++ b/replay/replay-snapshot.c
@@ -83,7 +83,7 @@ void replay_vmstate_init(void)
exit(1);
}
} else if (replay_mode == REPLAY_MODE_PLAY) {
- if (load_snapshot(replay_snapshot, &err) != 0) {
+ if (!load_snapshot(replay_snapshot, &err)) {
error_report_err(err);
error_report("Could not load snapshot for icount replay");
exit(1);
diff --git a/softmmu/vl.c b/softmmu/vl.c
index bd55468669..8f655086b7 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -2529,7 +2529,7 @@ void qmp_x_exit_preconfig(Error **errp)
if (loadvm) {
Error *local_err = NULL;
- if (load_snapshot(loadvm, &local_err) < 0) {
+ if (!load_snapshot(loadvm, &local_err)) {
error_report_err(local_err);
autostart = 0;
exit(1);
--
2.29.2
- [PATCH v10 00/12] migration: bring improved savevm/loadvm/delvm to QMP, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 01/12] block: push error reporting into bdrv_all_*_snapshot functions, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 02/12] migration: Make save_snapshot() return bool, not 0/-1, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 04/12] block: add ability to specify list of blockdevs during snapshot, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 05/12] block: allow specifying name of block device for vmstate storage, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 03/12] migration: stop returning errno from load_snapshot(),
Daniel P . Berrangé <=
- [PATCH v10 10/12] iotests: add support for capturing and matching QMP events, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 11/12] iotests: fix loading of common.config from tests/ subdir, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 06/12] block: rename and alter bdrv_all_find_snapshot semantics, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 08/12] migration: wire up support for snapshot device selection, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 09/12] migration: introduce a delete_snapshot wrapper, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 07/12] migration: control whether snapshots are ovewritten, Daniel P . Berrangé, 2021/02/02
- [PATCH v10 12/12] migration: introduce snapshot-{save, load, delete} QMP commands, Daniel P . Berrangé, 2021/02/02