[Qemu-devel] [PATCH 4/5] vmdk: Implement .bdrv_get_info()

[Fam Zheng <famz@redhat.com>]

This will return cluster_size and is_compressed to caller, if all the
extents has the same value (or there's only one extent). Otherwise
return -ENOTSUP.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/vmdk.c               | 19 +++++++++++++++++++
 tests/qemu-iotests/059.out |  1 +
 2 files changed, 20 insertions(+)

diff --git a/block/vmdk.c b/block/vmdk.c
index f439206..07f77d8 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1905,6 +1905,24 @@ static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)
     return spec_info;
 }
 
+static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+    int i;
+    BDRVVmdkState *s = bs->opaque;
+    assert(s->num_extents);
+    bdi->is_compressed = s->extents[0].compressed;
+    bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
+    /* See if we have multiple extents but they have different cases */
+    for (i = 1; i < s->num_extents; i++) {
+        if (bdi->is_compressed != s->extents[i].compressed ||
+            bdi->cluster_size !=
+                s->extents[i].cluster_sectors << BDRV_SECTOR_BITS) {
+            return -ENOTSUP;
+        }
+    }
+    return 0;
+}
+
 static QEMUOptionParameter vmdk_create_options[] = {
     {
         .name = BLOCK_OPT_SIZE,
@@ -1959,6 +1977,7 @@ static BlockDriver bdrv_vmdk = {
     .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
     .bdrv_has_zero_init           = vmdk_has_zero_init,
     .bdrv_get_specific_info       = vmdk_get_specific_info,
+    .bdrv_get_info                = vmdk_get_info,
 
     .create_options               = vmdk_create_options,
 };
diff --git a/tests/qemu-iotests/059.out b/tests/qemu-iotests/059.out
index 2ded8a9..8394d14 100644
--- a/tests/qemu-iotests/059.out
+++ b/tests/qemu-iotests/059.out
@@ -21,6 +21,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2147483648
 image: TEST_DIR/t.IMGFMT
 file format: IMGFMT
 virtual size: 2.0G (2147483648 bytes)
+cluster_size: 2147483648
 
 === Testing monolithicFlat with zeroed_grain ===
 qemu-img: TEST_DIR/t.IMGFMT: Flat image can't enable zeroed grain
-- 
1.8.4.2