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[libvirt] [PATCH v3 29/31] Introduce virStorageVol{Download, Upload}Flags



These flags to APIs will tell if caller wants to use sparse
stream for storage transfer. At the same time, it's safe to
enable them in storage driver frontend and rely on our backends
checking the flags. This way we can enable specific flags only on
some specific backends, e.g. enable
VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM for filesystem backend but
not iSCSI backend.

Signed-off-by: Michal Privoznik <mprivozn redhat com>
---
 include/libvirt/libvirt-storage.h |  9 +++++++++
 src/libvirt-storage.c             |  4 ++--
 src/remote/remote_protocol.x      |  2 ++
 src/storage/storage_driver.c      |  4 ++--
 src/storage/storage_util.c        | 10 ++++++----
 5 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/include/libvirt/libvirt-storage.h b/include/libvirt/libvirt-storage.h
index 45ec72065..4517f713c 100644
--- a/include/libvirt/libvirt-storage.h
+++ b/include/libvirt/libvirt-storage.h
@@ -346,11 +346,20 @@ virStorageVolPtr        virStorageVolCreateXMLFrom      (virStoragePoolPtr pool,
                                                          const char *xmldesc,
                                                          virStorageVolPtr clonevol,
                                                          unsigned int flags);
+
+typedef enum {
+    VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM = 1 << 0, /* Use sparse stream */
+} virStorageVolDownloadFlags;
+
 int                     virStorageVolDownload           (virStorageVolPtr vol,
                                                          virStreamPtr stream,
                                                          unsigned long long offset,
                                                          unsigned long long length,
                                                          unsigned int flags);
+typedef enum {
+    VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM = 1 << 0,  /* Use sparse stream */
+} virStorageVolUploadFlags;
+
 int                     virStorageVolUpload             (virStorageVolPtr vol,
                                                          virStreamPtr stream,
                                                          unsigned long long offset,
diff --git a/src/libvirt-storage.c b/src/libvirt-storage.c
index 05eec8a9d..64202998b 100644
--- a/src/libvirt-storage.c
+++ b/src/libvirt-storage.c
@@ -1549,7 +1549,7 @@ virStorageVolCreateXMLFrom(virStoragePoolPtr pool,
  * @stream: stream to use as output
  * @offset: position in @vol to start reading from
  * @length: limit on amount of data to download
- * @flags: extra flags; not used yet, so callers should always pass 0
+ * @flags: bitwise-OR of virStorageVolDownloadFlags
  *
  * Download the content of the volume as a stream. If @length
  * is zero, then the remaining contents of the volume after
@@ -1613,7 +1613,7 @@ virStorageVolDownload(virStorageVolPtr vol,
  * @stream: stream to use as input
  * @offset: position to start writing to
  * @length: limit on amount of data to upload
- * @flags: extra flags; not used yet, so callers should always pass 0
+ * @flags: bitwise-OR of virStorageVolUploadFlags
  *
  * Upload new content to the volume from a stream. This call
  * will fail if @offset + @length exceeds the size of the
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index 87b2bd365..25e62a181 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -4896,6 +4896,7 @@ enum remote_procedure {
     /**
      * @generate: both
      * @writestream: 1
+     * @sparseflag: VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM
      * @acl: storage_vol:data_write
      */
     REMOTE_PROC_STORAGE_VOL_UPLOAD = 208,
@@ -4903,6 +4904,7 @@ enum remote_procedure {
     /**
      * @generate: both
      * @readstream: 1
+     * @sparseflag: VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM
      * @acl: storage_vol:data_read
      */
     REMOTE_PROC_STORAGE_VOL_DOWNLOAD = 209,
diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index 2103ed11d..1b0d776c7 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -2117,7 +2117,7 @@ storageVolDownload(virStorageVolPtr obj,
     virStorageVolDefPtr vol = NULL;
     int ret = -1;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM, -1);
 
     if (!(vol = virStorageVolDefFromVol(obj, &pool, &backend)))
         return -1;
@@ -2285,7 +2285,7 @@ storageVolUpload(virStorageVolPtr obj,
     virStorageVolStreamInfoPtr cbdata = NULL;
     int ret = -1;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM, -1);
 
     if (!(vol = virStorageVolDefFromVol(obj, &pool, &backend)))
         return -1;
diff --git a/src/storage/storage_util.c b/src/storage/storage_util.c
index 908cad874..493c651b7 100644
--- a/src/storage/storage_util.c
+++ b/src/storage/storage_util.c
@@ -2401,8 +2401,9 @@ virStorageBackendVolUploadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
     char *target_path = vol->target.path;
     int ret = -1;
     int has_snap = 0;
+    bool sparse = flags & VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM, -1);
     /* if volume has target format VIR_STORAGE_FILE_PLOOP
      * we need to restore DiskDescriptor.xml, according to
      * new contents of volume. This operation will be perfomed
@@ -2427,7 +2428,7 @@ virStorageBackendVolUploadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
     /* Not using O_CREAT because the file is required to already exist at
      * this point */
     ret = virFDStreamOpenBlockDevice(stream, target_path,
-                                     offset, len, false, O_WRONLY);
+                                     offset, len, sparse, O_WRONLY);
 
  cleanup:
     VIR_FREE(path);
@@ -2447,8 +2448,9 @@ virStorageBackendVolDownloadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
     char *target_path = vol->target.path;
     int ret = -1;
     int has_snap = 0;
+    bool sparse = flags & VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM, -1);
     if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
         has_snap = storageBackendPloopHasSnapshots(vol->target.path);
         if (has_snap < 0) {
@@ -2465,7 +2467,7 @@ virStorageBackendVolDownloadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
     }
 
     ret = virFDStreamOpenBlockDevice(stream, target_path,
-                                     offset, len, false, O_RDONLY);
+                                     offset, len, sparse, O_RDONLY);
 
  cleanup:
     VIR_FREE(path);
-- 
2.13.0


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