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[PATCH v9 02/11] migration: Make save_snapshot() return bool, not 0/-1
From: |
Daniel P . Berrangé |
Subject: |
[PATCH v9 02/11] migration: Make save_snapshot() return bool, not 0/-1 |
Date: |
Wed, 20 Jan 2021 10:44:02 +0000 |
From: Philippe Mathieu-Daudé <philmd@redhat.com>
Just for consistency, following the example documented since
commit e3fe3988d7 ("error: Document Error API usage rules"),
return a boolean value indicating an error is set or not.
Acked-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
include/migration/snapshot.h | 9 ++++++++-
migration/savevm.c | 16 ++++++++--------
replay/replay-debugging.c | 2 +-
replay/replay-snapshot.c | 2 +-
4 files changed, 18 insertions(+), 11 deletions(-)
diff --git a/include/migration/snapshot.h b/include/migration/snapshot.h
index c85b6ec75b..0eaf1ba0b1 100644
--- a/include/migration/snapshot.h
+++ b/include/migration/snapshot.h
@@ -15,7 +15,14 @@
#ifndef QEMU_MIGRATION_SNAPSHOT_H
#define QEMU_MIGRATION_SNAPSHOT_H
-int save_snapshot(const char *name, Error **errp);
+/**
+ * save_snapshot: Save 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 save_snapshot(const char *name, Error **errp);
int load_snapshot(const char *name, Error **errp);
#endif
diff --git a/migration/savevm.c b/migration/savevm.c
index 4a7237337e..ef7963f6c9 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2729,7 +2729,7 @@ int qemu_load_device_state(QEMUFile *f)
return 0;
}
-int save_snapshot(const char *name, Error **errp)
+bool save_snapshot(const char *name, Error **errp)
{
BlockDriverState *bs;
QEMUSnapshotInfo sn1, *sn = &sn1;
@@ -2742,29 +2742,29 @@ int save_snapshot(const char *name, Error **errp)
AioContext *aio_context;
if (migration_is_blocked(errp)) {
- return ret;
+ return false;
}
if (!replay_can_snapshot()) {
error_setg(errp, "Record/replay does not allow making snapshot "
"right now. Try once more later.");
- return ret;
+ return false;
}
if (!bdrv_all_can_snapshot(errp)) {
- return ret;
+ return false;
}
/* Delete old snapshots of the same name */
if (name) {
if (bdrv_all_delete_snapshot(name, errp) < 0) {
- return ret;
+ return false;
}
}
bs = bdrv_all_find_vmstate_bs(errp);
if (bs == NULL) {
- return ret;
+ return false;
}
aio_context = bdrv_get_aio_context(bs);
@@ -2773,7 +2773,7 @@ int save_snapshot(const char *name, Error **errp)
ret = global_state_store();
if (ret) {
error_setg(errp, "Error saving global state");
- return ret;
+ return false;
}
vm_stop(RUN_STATE_SAVE_VM);
@@ -2845,7 +2845,7 @@ int save_snapshot(const char *name, Error **errp)
if (saved_vm_running) {
vm_start();
}
- return ret;
+ return ret == 0;
}
void qmp_xen_save_devices_state(const char *filename, bool has_live, bool live,
diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c
index 3a9b609e62..8e0050915d 100644
--- a/replay/replay-debugging.c
+++ b/replay/replay-debugging.c
@@ -323,7 +323,7 @@ void replay_gdb_attached(void)
*/
if (replay_mode == REPLAY_MODE_PLAY
&& !replay_snapshot) {
- if (save_snapshot("start_debugging", NULL) != 0) {
+ if (!save_snapshot("start_debugging", NULL)) {
/* Can't create the snapshot. Continue conventional debugging. */
}
}
diff --git a/replay/replay-snapshot.c b/replay/replay-snapshot.c
index e26fa4c892..4f2560d156 100644
--- a/replay/replay-snapshot.c
+++ b/replay/replay-snapshot.c
@@ -77,7 +77,7 @@ void replay_vmstate_init(void)
if (replay_snapshot) {
if (replay_mode == REPLAY_MODE_RECORD) {
- if (save_snapshot(replay_snapshot, &err) != 0) {
+ if (!save_snapshot(replay_snapshot, &err)) {
error_report_err(err);
error_report("Could not create snapshot for icount record");
exit(1);
--
2.29.2
- [PATCH v9 00/11] migration: bring improved savevm/loadvm/delvm to QMP, Daniel P . Berrangé, 2021/01/20
- [PATCH v9 01/11] block: push error reporting into bdrv_all_*_snapshot functions, Daniel P . Berrangé, 2021/01/20
- [PATCH v9 02/11] migration: Make save_snapshot() return bool, not 0/-1,
Daniel P . Berrangé <=
- [PATCH v9 03/11] migration: stop returning errno from load_snapshot(), Daniel P . Berrangé, 2021/01/20
- [PATCH v9 04/11] block: add ability to specify list of blockdevs during snapshot, Daniel P . Berrangé, 2021/01/20
- [PATCH v9 05/11] block: allow specifying name of block device for vmstate storage, Daniel P . Berrangé, 2021/01/20
- [PATCH v9 07/11] migration: control whether snapshots are ovewritten, Daniel P . Berrangé, 2021/01/20
- [PATCH v9 06/11] block: rename and alter bdrv_all_find_snapshot semantics, Daniel P . Berrangé, 2021/01/20
- [PATCH v9 08/11] migration: wire up support for snapshot device selection, Daniel P . Berrangé, 2021/01/20