[Qemu-devel] [PATCH 07/16] Backup: clear all bitmap when doing block checkpoint

[Wen Congyang <wency@cn.fujitsu.com>]

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Cc: Jeff Cody <jcody@redhat.com>
---
 block/backup.c           | 14 ++++++++++++++
 blockjob.c               | 11 +++++++++++
 include/block/blockjob.h | 12 ++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/block/backup.c b/block/backup.c
index b729c4b..59bdb79 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -217,11 +217,25 @@ static void backup_iostatus_reset(BlockJob *job)
     bdrv_iostatus_reset(s->target);
 }
 
+static void backup_do_checkpoint(BlockJob *job, Error **errp)
+{
+    BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common);
+
+    if (backup_job->sync_mode != MIRROR_SYNC_MODE_NONE) {
+        error_setg(errp, "The backup job only supports block checkpoint in"
+                   " sync=none mode");
+        return;
+    }
+
+    hbitmap_reset_all(backup_job->bitmap);
+}
+
 static const BlockJobDriver backup_job_driver = {
     .instance_size  = sizeof(BackupBlockJob),
     .job_type       = BLOCK_JOB_TYPE_BACKUP,
     .set_speed      = backup_set_speed,
     .iostatus_reset = backup_iostatus_reset,
+    .do_checkpoint  = backup_do_checkpoint,
 };
 
 static BlockErrorAction backup_error_action(BackupBlockJob *job,
diff --git a/blockjob.c b/blockjob.c
index 62bb906..5528d92 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -404,3 +404,14 @@ void block_job_defer_to_main_loop(BlockJob *job,
 
     qemu_bh_schedule(data->bh);
 }
+
+void block_job_do_checkpoint(BlockJob *job, Error **errp)
+{
+    if (!job->driver->do_checkpoint) {
+        error_setg(errp, "The job %s doesn't support block checkpoint",
+                   BlockJobType_lookup[job->driver->job_type]);
+        return;
+    }
+
+    job->driver->do_checkpoint(job, errp);
+}
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index dd9d5e6..0b4f386 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -50,6 +50,9 @@ typedef struct BlockJobDriver {
      * manually.
      */
     void (*complete)(BlockJob *job, Error **errp);
+
+    /** Optional callback for job types that support checkpoint. */
+    void (*do_checkpoint)(BlockJob *job, Error **errp);
 } BlockJobDriver;
 
 /**
@@ -356,4 +359,13 @@ void block_job_defer_to_main_loop(BlockJob *job,
                                   BlockJobDeferToMainLoopFn *fn,
                                   void *opaque);
 
+/**
+ * block_job_do_checkpoint:
+ * @job: The job.
+ * @errp: Error object.
+ *
+ * Do block checkpoint on the specified job.
+ */
+void block_job_do_checkpoint(BlockJob *job, Error **errp);
+
 #endif
-- 
2.4.3