[PATCH 1/4] Introduce virDomainBlockBackup API

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For Backuping the disk image.

It supports tree backup mode: full, top, incremental.
Incremental backup mode must do full or top backup first,
and it exists dirty bitmap to trace io.

Signed-off-by: longyou <longyou@xxxxxxxxxxx>
---
 docs/apibuild.py                 |  3 ++-
 include/libvirt/libvirt-domain.h | 15 +++++++++++
 src/driver-hypervisor.h          |  9 +++++++
 src/libvirt-domain.c             | 56 ++++++++++++++++++++++++++++++++++++++++
 src/libvirt_public.syms          |  5 ++++
 src/remote/remote_driver.c       |  1 +
 src/remote/remote_protocol.x     | 17 +++++++++++-
 src/remote_protocol-structs      |  9 +++++++
 8 files changed, 113 insertions(+), 2 deletions(-)

diff --git a/docs/apibuild.py b/docs/apibuild.py
index f5216ea..42ce538 100755
--- a/docs/apibuild.py
+++ b/docs/apibuild.py
@@ -1851,7 +1851,8 @@ class CParser:
         "virDomainBlockJobSetSpeed"      : (False, ("bandwidth")),
         "virDomainBlockPull"             : (False, ("bandwidth")),
         "virDomainBlockRebase"           : (False, ("bandwidth")),
-        "virDomainMigrateGetMaxSpeed"    : (False, ("bandwidth")) }
+        "virDomainMigrateGetMaxSpeed"    : (False, ("bandwidth")),
+        "virDomainBlockBackup"           : (False, ("bandwidth")) }
 
     def checkLongLegacyFunction(self, name, return_type, signature):
         if "long" in return_type and "long long" not in return_type:
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index cba4fa5..3a9ab6c 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2139,6 +2139,21 @@ int virDomainBlockCommit(virDomainPtr dom, const char *disk, const char *base,
                          const char *top, unsigned long bandwidth,
                          unsigned int flags);
 
+/**
+ * virDomainBlockBackupFlags:
+ *
+ * Flags available for virDomainBlockBackup().
+ */
+typedef enum {
+    VIR_DOMAIN_BLOCK_BACKUP_FULL = 1 << 1, /* Backup with full mode */
+    VIR_DOMAIN_BLOCK_BACKUP_TOP = 1 << 2, /* Backup with top mode */
+    VIR_DOMAIN_BLOCK_BACKUP_INCREMENTAL = 1 << 3, /* Backup with incremental
+                                                     mode by dirty bitmap */
+} virDomainBlockBackupFlags;
+
+int virDomainBlockBackup(virDomainPtr dom, const char *path, const char *dest,
+                         unsigned long bandwidth, const char *format,
+                         unsigned int flags);
 
 /* Block I/O throttling support */
 
diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h
index d11ff7f..171eb14 100644
--- a/src/driver-hypervisor.h
+++ b/src/driver-hypervisor.h
@@ -1020,6 +1020,14 @@ typedef int
                            unsigned int flags);
 
 typedef int
+(*virDrvDomainBlockBackup)(virDomainPtr dom,
+                           const char *path,
+                           const char *dest,
+                           unsigned long long bandwidth,
+                           const char *format,
+                           unsigned int flags);
+
+typedef int
 (*virDrvConnectSetKeepAlive)(virConnectPtr conn,
                              int interval,
                              unsigned int count);
@@ -1436,6 +1444,7 @@ struct _virHypervisorDriver {
     virDrvDomainBlockRebase domainBlockRebase;
     virDrvDomainBlockCopy domainBlockCopy;
     virDrvDomainBlockCommit domainBlockCommit;
+    virDrvDomainBlockBackup domainBlockBackup;
     virDrvConnectSetKeepAlive connectSetKeepAlive;
     virDrvConnectIsAlive connectIsAlive;
     virDrvNodeSuspendForDuration nodeSuspendForDuration;
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 73ae369..18ef249 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -10473,6 +10473,62 @@ virDomainBlockCommit(virDomainPtr dom, const char *disk,
 
 
 /**
+ * virDomainBlockBackup:
+ * @dom: pointer to domain object
+ * @path: path to the block device, or device shorthand
+ * @dest: path to image for backup
+ * @bandwidth: (optional) specify bandwidth limit; flags determine the unit
+ * @format: (optional) the dest image format
+ * @flags: bitwise-OR of virDomainBlockBackupFlags
+ *
+ * Backup the path image to dest image, it supports three backup mode:
+ * "full" mode with flags VIR_DOMAIN_BLOCK_BACKUP_FULL, it will backup all
+ * data in the image chain.
+ * "top" mode with flags VIR_DOMAIN_BLOCK_BACKUP_TOP, it only backup the
+ * data of top image to dest image.
+ * "incremental" mode with flags VIR_DOMAIN_BLOCK_BACKUP_INCREMENTAL, it wosks
+ * with dirty bitmap when done the "full" or "top" mode backup. Incremental
+ * backup only backup the data in the dirty bitmap.
+ *
+ * Returns 0 if the operation has started, -1 on failure.
+ */
+int
+virDomainBlockBackup(virDomainPtr dom, const char *path,
+                     const char *dest, unsigned long bandwidth,
+                     const char *format, unsigned int flags)
+{
+    virConnectPtr conn;
+
+    VIR_DOMAIN_DEBUG(dom, "path=%s, dest=%s, bandwidth=%lu, format=%s, flags=%x",
+                     path, dest, bandwidth, format, flags);
+
+    virResetLastError();
+
+    virCheckDomainReturn(dom, -1);
+    conn = dom->conn;
+
+    virCheckReadOnlyGoto(conn->flags, error);
+    virCheckNonNullArgGoto(path, error);
+    virCheckNonNullArgGoto(dest, error);
+
+    if (conn->driver->domainBlockBackup) {
+        int ret;
+        ret = conn->driver->domainBlockBackup(dom, path, dest,
+                bandwidth, format, flags);
+        if (ret < 0)
+            goto error;
+        return ret;
+    }
+
+    virReportUnsupportedError();
+
+error:
+    virDispatchError(dom->conn);
+    return -1;
+}
+
+
+/**
  * virDomainOpenGraphics:
  * @dom: pointer to domain object
  * @idx: index of graphics config to open
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index 1e920d6..34a2fff 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -732,4 +732,9 @@ LIBVIRT_1.3.3 {
         virDomainSetPerfEvents;
 } LIBVIRT_1.2.19;
 
+LIBVIRT_1.3.6 {
+    global:
+        virDomainBlockBackup;
+} LIBVIRT_1.3.3;
+
 # .... define new API here using predicted next version number ....
diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index e3cf5fb..7513a7f 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -7796,6 +7796,7 @@ static virHypervisorDriver hypervisor_driver = {
     .domainBlockRebase = remoteDomainBlockRebase, /* 0.9.10 */
     .domainBlockCopy = remoteDomainBlockCopy, /* 1.2.9 */
     .domainBlockCommit = remoteDomainBlockCommit, /* 0.10.2 */
+    .domainBlockBackup = remoteDomainBlockBackup, /* 1.3.6 */
     .connectSetKeepAlive = remoteConnectSetKeepAlive, /* 0.9.8 */
     .connectIsAlive = remoteConnectIsAlive, /* 0.9.8 */
     .nodeSuspendForDuration = remoteNodeSuspendForDuration, /* 0.9.8 */
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index bab8ef2..0f3b29c 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -1364,6 +1364,15 @@ struct remote_domain_block_commit_args {
     unsigned int flags;
 };
 
+struct remote_domain_block_backup_args {
+    remote_nonnull_domain dom;
+    remote_nonnull_string path;
+    remote_nonnull_string dest;
+    unsigned hyper bandwidth;
+    remote_string format;
+    unsigned int flags;
+};
+
 struct remote_domain_set_block_io_tune_args {
     remote_nonnull_domain dom;
     remote_nonnull_string disk;
@@ -5793,5 +5802,11 @@ enum remote_procedure {
      * @generate: both
      * @acl: none
      */
-    REMOTE_PROC_DOMAIN_EVENT_CALLBACK_DEVICE_REMOVAL_FAILED = 367
+    REMOTE_PROC_DOMAIN_EVENT_CALLBACK_DEVICE_REMOVAL_FAILED = 367,
+
+    /**
+     * @generate: both
+     * @acl: domain:block_write
+     */
+    REMOTE_PROC_DOMAIN_BLOCK_BACKUP = 368
 };
diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs
index fe1b8a8..e3cc5c5 100644
--- a/src/remote_protocol-structs
+++ b/src/remote_protocol-structs
@@ -996,6 +996,14 @@ struct remote_domain_block_commit_args {
         uint64_t                   bandwidth;
         u_int                      flags;
 };
+struct remote_domain_block_backup_args {
+        remote_nonnull_domain      dom;
+        remote_nonnull_string      path;
+        remote_nonnull_string      dest;
+        uint64_t                   bandwidth;
+        remote_string              format;
+        u_int                      flags;
+};
 struct remote_domain_set_block_io_tune_args {
         remote_nonnull_domain      dom;
         remote_nonnull_string      disk;
@@ -3103,4 +3111,5 @@ enum remote_procedure {
         REMOTE_PROC_DOMAIN_GET_PERF_EVENTS = 365,
         REMOTE_PROC_DOMAIN_SET_PERF_EVENTS = 366,
         REMOTE_PROC_DOMAIN_EVENT_CALLBACK_DEVICE_REMOVAL_FAILED = 367,
+        REMOTE_PROC_DOMAIN_BLOCK_BACKUP = 358,
 };
-- 
2.6.4

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