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@xxxxxxxxxx>
---
include/libvirt/libvirt-storage.h | 9 +++++++++
src/libvirt-storage.c | 4 ++--
src/remote/remote_protocol.x | 2 ++
src/storage/storage_driver.c | 4 ++--
4 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/include/libvirt/libvirt-storage.h b/include/libvirt/libvirt-storage.h
index a67a97f..e08af50 100644
--- a/include/libvirt/libvirt-storage.h
+++ b/include/libvirt/libvirt-storage.h
@@ -337,11 +337,20 @@ 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 cebe02f..5ab719f 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 d11bfdf..65dc2a8 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -4798,6 +4798,7 @@ 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,
@@ -4805,6 +4806,7 @@ 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 e2d729f..a153a59 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -2224,7 +2224,7 @@ 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;
@@ -2394,7 +2394,7 @@ 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;
--
2.8.4
--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list