[PATCH 2/4] qemu drive support block backup.

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qemu drive support block backup, it use qmp command "drive-backup"
to start the block, and use qmp command "block-dirty-bitmap-add"/
"block-dirty-bitmap-clear"/"block-dirty-bitmap-remove" to manage
the bitmap. Bitmap is used to incremental backup.

Signed-off-by: longyou <longyou@xxxxxxxxxxx>
---
 src/conf/domain_conf.h       |  12 +++
 src/qemu/qemu_blockjob.c     |   2 +
 src/qemu/qemu_capabilities.c |   4 +
 src/qemu/qemu_capabilities.h |   5 ++
 src/qemu/qemu_driver.c       | 197 +++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_monitor.c      |  59 +++++++++++++
 src/qemu/qemu_monitor.h      |  23 +++++
 src/qemu/qemu_monitor_json.c | 124 +++++++++++++++++++++++++++
 src/qemu/qemu_monitor_json.h |  23 +++++
 9 files changed, 449 insertions(+)

diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index c182747..44cbefa 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -556,6 +556,15 @@ typedef enum {
 } virDomainDiskMirrorState;
 
 
+typedef enum {
+    VIR_DOMAIN_DISK_BACKUP_STATE_NONE = 0, /* No job, or job not finished */
+    VIR_DOMAIN_DISK_BACKUP_STATE_FINISH, /* Job already finish */
+    VIR_DOMAIN_DISK_BACKUP_STATE_ABORT, /* Cause error, job aborted */
+
+    VIR_DOMAIN_DISK_BACKUP_STATE_LAST
+} virDomainDiskBackupState;
+
+
 /* Stores the virtual disk configuration */
 struct _virDomainDiskDef {
     virStorageSourcePtr src; /* non-NULL.  XXX Allow NULL for empty cdrom? */
@@ -606,6 +615,9 @@ struct _virDomainDiskDef {
     int discard; /* enum virDomainDiskDiscard */
     unsigned int iothread; /* unused = 0, > 0 specific thread # */
     char *domain_name; /* backend domain name */
+
+    bool full_backup; /* done full backup or not */
+    int backup_state; /* enum virDomainDiskBackupState */
 };
 
 
diff --git a/src/qemu/qemu_blockjob.c b/src/qemu/qemu_blockjob.c
index 83a5a3f..de8c0e4 100644
--- a/src/qemu/qemu_blockjob.c
+++ b/src/qemu/qemu_blockjob.c
@@ -162,6 +162,8 @@ qemuBlockJobEventProcess(virQEMUDriverPtr driver,
         disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_UNKNOWN;
         ignore_value(qemuDomainDetermineDiskChain(driver, vm, disk,
                                                   true, true));
+
+        disk->backup_state = VIR_DOMAIN_DISK_BACKUP_STATE_FINISH;
         diskPriv->blockjob = false;
         break;
 
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index d32e71f..52344f6 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -329,6 +329,9 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "nec-usb-xhci-ports",
               "virtio-scsi-pci.iothread",
               "name-guest",
+
+              "drive-backup", /* 225 */
+              "drive-backup-incremental",
     );
 
 
@@ -1452,6 +1455,7 @@ struct virQEMUCapsStringFlags virQEMUCapsCommands[] = {
     { "block-commit", QEMU_CAPS_BLOCK_COMMIT },
     { "query-vnc", QEMU_CAPS_VNC },
     { "drive-mirror", QEMU_CAPS_DRIVE_MIRROR },
+    { "drive-backup", QEMU_CAPS_DRIVE_BACKUP },
     { "blockdev-snapshot-sync", QEMU_CAPS_DISK_SNAPSHOT },
     { "add-fd", QEMU_CAPS_ADD_FD },
     { "nbd-server-start", QEMU_CAPS_NBD_SERVER },
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 368996a..cd1d2ae 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -361,6 +361,11 @@ typedef enum {
     QEMU_CAPS_VIRTIO_SCSI_IOTHREAD, /* virtio-scsi-{pci,ccw}.iothread */
     QEMU_CAPS_NAME_GUEST, /* -name guest= */
 
+    /* 225 */
+    QEMU_CAPS_DRIVE_BACKUP, /* drive-backup monitor command */
+    QEMU_CAPS_DRIVE_BACKUP_INCREMENTAL, /* drive-backup works
+                                            with "incremental" */
+
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
 
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 10d3e3d..aaa249a 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16941,6 +16941,202 @@ qemuDomainBlockCommit(virDomainPtr dom,
     return ret;
 }
 
+#define QEMU_DRIVE_BACKUP_BITMAP "drive-backup-bitmap"
+
+static int
+qemuDomainDriveBackupReady(virQEMUDriverPtr driver,
+                              virDomainObjPtr vm,
+                              virDomainDiskDefPtr disk)
+{
+    int status;
+
+    status = qemuBlockJobUpdate(driver, vm, disk);
+    if (status == VIR_DOMAIN_BLOCK_JOB_FAILED) {
+        virReportError(VIR_ERR_OPERATION_FAILED,
+                       _("backup of disk %s failed"),
+                       disk->dst);
+        return -1;
+    }
+
+    if (disk->backup_state == VIR_DOMAIN_DISK_BACKUP_STATE_FINISH) {
+        VIR_DEBUG("disk backup are finished");
+        return 1;
+    } else {
+        VIR_DEBUG("Waiting for disk backup to get ready");
+        return 0;
+    }
+}
+
+static int
+qemuDomainBlockBackup(virDomainPtr dom,
+                      const char *path,
+                      const char *dest,
+                      unsigned long long bandwidth,
+                      const char *format,
+                      unsigned int flags)
+{
+    int ret = -1;
+    virQEMUDriverPtr driver = dom->conn->privateData;
+    qemuDomainObjPrivatePtr priv;
+    virDomainObjPtr vm = NULL;
+    char *device = NULL;
+    char *mode = NULL;
+    char *bitmap = NULL;
+    virDomainDiskDefPtr disk = NULL;
+    unsigned long long speed = bandwidth;
+    int sync_begin = 0;
+
+    virCheckFlags(VIR_DOMAIN_BLOCK_BACKUP_FULL |
+                  VIR_DOMAIN_BLOCK_BACKUP_TOP |
+                  VIR_DOMAIN_BLOCK_BACKUP_INCREMENTAL, -1);
+
+    if (!(vm = qemuDomObjFromDomain(dom)))
+        goto cleanup;
+    priv = vm->privateData;
+
+    if (virDomainBlockBackupEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+        goto cleanup;
+
+    if (!virDomainObjIsActive(vm)) {
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       "%s", _("domain is not running"));
+        goto endjob;
+    }
+
+    if (!(virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DRIVE_BACKUP) &&
+          virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKJOB_ASYNC))) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("online backup not supported with this QEMU binary"));
+        goto endjob;
+    }
+
+    /* Convert bandwidth MiB to bytes, if necessary */
+    if (speed > LLONG_MAX >> 20) {
+        virReportError(VIR_ERR_OVERFLOW,
+                       _("bandwidth must be less than %llu"),
+                       LLONG_MAX >> 20);
+        goto endjob;
+    }
+    speed <<= 20;
+
+    if (!(disk = qemuDomainDiskByName(vm->def, path)))
+        goto endjob;
+
+    if (!(device = qemuAliasFromDisk(disk)))
+        goto endjob;
+
+    if (qemuDomainDiskBlockJobIsActive(disk))
+        goto endjob;
+
+    if (!flags ||
+        (flags & VIR_DOMAIN_BLOCK_BACKUP_FULL) ||
+        (flags & VIR_DOMAIN_BLOCK_BACKUP_TOP)) {
+        qemuDomainObjEnterMonitor(driver, vm);
+        if (disk->full_backup) {
+            /* clear bitmap */
+            ret = qemuMonitorBlockDirtyBitmapClear(priv->mon, device,
+                                             QEMU_DRIVE_BACKUP_BITMAP);
+        } else {
+            /* add bitmap */
+            disk->full_backup = true;
+            ret = qemuMonitorBlockDirtyBitmapAdd(priv->mon, device,
+                                           QEMU_DRIVE_BACKUP_BITMAP, 0);
+        }
+
+        if (qemuDomainObjExitMonitor(driver, vm) < 0) {
+            ret = -1;
+            goto rollback;
+        }
+
+        if (ret < 0) {
+            virReportError(VIR_ERR_OPERATION_INVALID,
+                           _("disk %s add or clear dirty bitmap failed"),
+                           disk->dst);
+            goto rollback;
+        }
+
+        if (flags & VIR_DOMAIN_BLOCK_BACKUP_TOP) {
+            ignore_value(VIR_STRDUP(mode, "top"));
+        } else {
+            ignore_value(VIR_STRDUP(mode, "full"));
+        }
+    } else if (flags & VIR_DOMAIN_BLOCK_BACKUP_INCREMENTAL) {
+        if (!disk->full_backup) {
+            virReportError(VIR_ERR_OPERATION_INVALID,
+                    _("disk %s has no bitmap, must do full backup firstly"),
+                    disk->dst);
+            goto endjob;
+        }
+        ignore_value(VIR_STRDUP(mode, "incremental"));
+        ignore_value(VIR_STRDUP(bitmap, QEMU_DRIVE_BACKUP_BITMAP));
+    } else {
+        goto endjob;
+    }
+
+    qemuBlockJobSyncBegin(disk);
+    sync_begin = 1;
+
+    qemuDomainObjEnterMonitor(driver, vm);
+    ret = qemuMonitorDriveBackup(priv->mon, device, dest,
+                                mode, format, bitmap, speed);
+    if (qemuDomainObjExitMonitor(driver, vm) < 0) {
+        ret = -1;
+        goto rollback;
+    }
+
+    if (ret == 0)
+        QEMU_DOMAIN_DISK_PRIVATE(disk)->blockjob = true;
+    else {
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       _("disk %s do backup failed"), disk->dst);
+        goto rollback;
+    }
+
+    /* reset backup state */
+    disk->backup_state = VIR_DOMAIN_DISK_BACKUP_STATE_NONE;
+    while ((ret = qemuDomainDriveBackupReady(driver, vm, disk)) != 1) {
+        if (ret)
+            goto rollback;
+
+        if (priv->job.abortJob) {
+            priv->job.current->type = VIR_DOMAIN_JOB_CANCELLED;
+            virReportError(VIR_ERR_OPERATION_ABORTED, _("%s: %s"),
+                           qemuDomainAsyncJobTypeToString(priv->job.asyncJob),
+                           _("canceled by client"));
+            goto rollback;
+        }
+
+        if (virDomainObjWait(vm) < 0)
+            goto rollback;
+    }
+
+endjob:
+    if (sync_begin)
+        qemuBlockJobSyncEnd(driver, vm, disk);
+
+    qemuDomainObjEndJob(driver, vm);
+
+cleanup:
+    VIR_FREE(device);
+    VIR_FREE(mode);
+    VIR_FREE(bitmap);
+    virDomainObjEndAPI(&vm);
+    return ret;
+
+rollback:
+    qemuDomainObjEnterMonitor(driver, vm);
+    qemuMonitorBlockDirtyBitmapRemove(priv->mon, device,
+                                QEMU_DRIVE_BACKUP_BITMAP);
+    if (qemuDomainObjExitMonitor(driver, vm) < 0)
+        ret = -1;
+
+    disk->full_backup = false;
+    goto endjob;
+}
+
 static int
 qemuDomainOpenGraphics(virDomainPtr dom,
                        unsigned int idx,
@@ -19912,6 +20108,7 @@ static virHypervisorDriver qemuHypervisorDriver = {
     .domainBlockRebase = qemuDomainBlockRebase, /* 0.9.10 */
     .domainBlockCopy = qemuDomainBlockCopy, /* 1.2.9 */
     .domainBlockCommit = qemuDomainBlockCommit, /* 1.0.0 */
+    .domainBlockBackup = qemuDomainBlockBackup, /* 1.3.6 */
     .connectIsAlive = qemuConnectIsAlive, /* 0.9.8 */
     .nodeSuspendForDuration = qemuNodeSuspendForDuration, /* 0.9.8 */
     .domainSetBlockIoTune = qemuDomainSetBlockIoTune, /* 0.9.8 */
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 597307f..ef52fa1 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -2935,6 +2935,65 @@ qemuMonitorSupportsActiveCommit(qemuMonitorPtr mon)
 }
 
 
+/* Start a block-backup block job.  bandwidth is in bytes/sec.  */
+int
+qemuMonitorDriveBackup(qemuMonitorPtr mon, const char *device,
+                       const char *dest, const char *mode,
+                       const char *format, const char *bitmap,
+                       unsigned long long bandwidth)
+{
+    VIR_DEBUG("device=%s, dest=%s, mode=%s, "
+            "format=%s, bitmap=%s, bandwidth=%llu",
+             device, dest, mode, NULLSTR(format),
+             NULLSTR(bitmap), bandwidth);
+
+    QEMU_CHECK_MONITOR_JSON(mon);
+
+    return qemuMonitorJSONDriveBackup(mon, device, dest, mode,
+                                      format, bitmap, bandwidth);
+}
+
+
+/* add dirty bitmap for backup on the block device. */
+int
+qemuMonitorBlockDirtyBitmapAdd(qemuMonitorPtr mon, const char *device,
+                               const char *bitmap, unsigned int granularity)
+{
+    VIR_DEBUG("device=%s, bitmap=%s, granularity=%#x",
+            device, bitmap, granularity);
+
+    QEMU_CHECK_MONITOR_JSON(mon);
+
+    return qemuMonitorJSONBlockDirtyBitmapAdd(mon, device, bitmap, granularity);
+}
+
+
+/* remove dirty bitmap for backup on the block device. */
+int
+qemuMonitorBlockDirtyBitmapRemove(qemuMonitorPtr mon,
+                                const char *device, const char *bitmap)
+{
+    VIR_DEBUG("device=%s, bitmap=%s", device, bitmap);
+
+    QEMU_CHECK_MONITOR_JSON(mon);
+
+    return qemuMonitorJSONBlockDirtyBitmapRemove(mon, device, bitmap);
+}
+
+
+/* clear dirty bitmap for backup on the block device. */
+int
+qemuMonitorBlockDirtyBitmapClear(qemuMonitorPtr mon,
+                                const char *device, const char *bitmap)
+{
+    VIR_DEBUG("device=%s, bitmap=%s", device, bitmap);
+
+    QEMU_CHECK_MONITOR_JSON(mon);
+
+    return qemuMonitorJSONBlockDirtyBitmapClear(mon, device, bitmap);
+}
+
+
 /* Determine the name that qemu is using for tracking the backing
  * element TARGET within the chain starting at TOP.  */
 char *
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index dd3587f..0dee9f6 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -736,6 +736,29 @@ int qemuMonitorBlockCommit(qemuMonitorPtr mon,
                            unsigned long long bandwidth)
     ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4);
 bool qemuMonitorSupportsActiveCommit(qemuMonitorPtr mon);
+
+int
+qemuMonitorDriveBackup(qemuMonitorPtr mon, const char *device,
+                       const char *dest, const char *mode,
+                       const char *format, const char *bitmap,
+                       unsigned long long bandwidth)
+    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4);
+
+int
+qemuMonitorBlockDirtyBitmapAdd(qemuMonitorPtr mon, const char *device,
+                               const char *bitmap, unsigned int granularity)
+    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3);
+
+int
+qemuMonitorBlockDirtyBitmapRemove(qemuMonitorPtr mon,
+                                  const char *device, const char *bitmap)
+    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3);
+
+int
+qemuMonitorBlockDirtyBitmapClear(qemuMonitorPtr mon,
+                                 const char *device, const char *bitmap)
+    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3);
+
 char *qemuMonitorDiskNameLookup(qemuMonitorPtr mon,
                                 const char *device,
                                 virStorageSourcePtr top,
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 585b882..9b06229 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -3902,6 +3902,130 @@ qemuMonitorJSONBlockCommit(qemuMonitorPtr mon, const char *device,
     return ret;
 }
 
+/* TODO:
+ */
+int
+qemuMonitorJSONDriveBackup(qemuMonitorPtr mon, const char *device,
+                           const char *dest, const char *mode,
+                           const char *format, const char *bitmap,
+                           unsigned long long speed)
+{
+    int ret = -1;
+    virJSONValuePtr cmd;
+    virJSONValuePtr reply = NULL;
+
+    cmd = qemuMonitorJSONMakeCommand("drive-backup",
+                                     "s:device", device,
+                                     "s:target", dest,
+                                     "s:sync", mode,
+                                     "s:mode", "existing",
+                                     "Y:speed", speed,
+                                     "S:format", format,
+                                     "S:bitmap", bitmap,
+                                     NULL);
+    if (!cmd)
+        return -1;
+
+    if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
+        goto cleanup;
+
+    ret = qemuMonitorJSONCheckError(cmd, reply);
+
+ cleanup:
+    virJSONValueFree(cmd);
+    virJSONValueFree(reply);
+    return ret;
+}
+
+/* TODO:
+ */
+int
+qemuMonitorJSONBlockDirtyBitmapAdd(qemuMonitorPtr mon,
+                                   const char *device,
+                                   const char *bitmap,
+                                   unsigned int granularity)
+{
+    int ret = -1;
+    virJSONValuePtr cmd;
+    virJSONValuePtr reply = NULL;
+
+    cmd = qemuMonitorJSONMakeCommand("block-dirty-bitmap-add",
+                                     "s:node", device,
+                                     "s:name", bitmap,
+                                     "p:granularity", granularity,
+                                     NULL);
+    if (!cmd)
+        return -1;
+
+    if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
+        goto cleanup;
+
+    ret = qemuMonitorJSONCheckError(cmd, reply);
+
+ cleanup:
+    virJSONValueFree(cmd);
+    virJSONValueFree(reply);
+    return ret;
+}
+
+/* TODO:
+ */
+int
+qemuMonitorJSONBlockDirtyBitmapRemove(qemuMonitorPtr mon,
+                                      const char *device,
+                                      const char *bitmap)
+{
+    int ret = -1;
+    virJSONValuePtr cmd;
+    virJSONValuePtr reply = NULL;
+
+    cmd = qemuMonitorJSONMakeCommand("block-dirty-bitmap-remove",
+                                     "s:node", device,
+                                     "s:name", bitmap,
+                                     NULL);
+    if (!cmd)
+        return -1;
+
+    if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
+        goto cleanup;
+
+    ret = qemuMonitorJSONCheckError(cmd, reply);
+
+ cleanup:
+    virJSONValueFree(cmd);
+    virJSONValueFree(reply);
+    return ret;
+}
+
+/* TODO:
+ */
+int
+qemuMonitorJSONBlockDirtyBitmapClear(qemuMonitorPtr mon,
+                                     const char *device,
+                                     const char *bitmap)
+{
+    int ret = -1;
+    virJSONValuePtr cmd;
+    virJSONValuePtr reply = NULL;
+
+    cmd = qemuMonitorJSONMakeCommand("block-dirty-bitmap-clear",
+                                     "s:node", device,
+                                     "s:name", bitmap,
+                                     NULL);
+    if (!cmd)
+        return -1;
+
+    if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
+        goto cleanup;
+
+    ret = qemuMonitorJSONCheckError(cmd, reply);
+
+ cleanup:
+    virJSONValueFree(cmd);
+    virJSONValueFree(reply);
+    return ret;
+}
+
 int
 qemuMonitorJSONDrivePivot(qemuMonitorPtr mon,
                           const char *device)
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index 76758db..5519e45 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -268,6 +268,29 @@ int qemuMonitorJSONBlockCommit(qemuMonitorPtr mon,
                                unsigned long long bandwidth)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
 
+int qemuMonitorJSONDriveBackup(qemuMonitorPtr mon, const char *device,
+                               const char *dest, const char *mode,
+                               const char *format, const char *bitmap,
+                               unsigned long long speed)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
+    ATTRIBUTE_NONNULL(4);
+
+int qemuMonitorJSONBlockDirtyBitmapAdd(qemuMonitorPtr mon,
+                                       const char *device,
+                                       const char *bitmap,
+                                       unsigned int granularity)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3);
+
+int qemuMonitorJSONBlockDirtyBitmapRemove(qemuMonitorPtr mon,
+                                          const char *device,
+                                          const char *bitmap)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+
+int qemuMonitorJSONBlockDirtyBitmapClear(qemuMonitorPtr mon,
+                                         const char *device,
+                                         const char *bitmap)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+
 char *qemuMonitorJSONDiskNameLookup(qemuMonitorPtr mon,
                                     const char *device,
                                     virStorageSourcePtr top,
-- 
2.6.4

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