[Qemu-devel] [PULL v2 05/50] vmdk: Fix converting to streamOptimized

[Max Reitz]

From: Fam Zheng <address@hidden>

Commit d62d9dc4b8 lifted streamOptimized images's version to 3, but we
now refuse to open version 3 images read-write.  We need to make
streamOptimized an exception to allow converting to it. This fixes the
accidentally broken iotests case 059 for the same reason.

Signed-off-by: Fam Zheng <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
Signed-off-by: Max Reitz <address@hidden>
---
 block/vmdk.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/block/vmdk.c b/block/vmdk.c
index 698679d..4a5850b 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -571,6 +571,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
     VmdkExtent *extent;
     BDRVVmdkState *s = bs->opaque;
     int64_t l1_backup_offset = 0;
+    bool compressed;
 
     ret = bdrv_pread(file->bs, sizeof(magic), &header, sizeof(header));
     if (ret < 0) {
@@ -645,6 +646,8 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
         header = footer.header;
     }
 
+    compressed =
+        le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
     if (le32_to_cpu(header.version) > 3) {
         char buf[64];
         snprintf(buf, sizeof(buf), "VMDK version %" PRId32,
@@ -652,7 +655,8 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
         error_setg(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
                    bdrv_get_device_or_node_name(bs), "vmdk", buf);
         return -ENOTSUP;
-    } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) {
+    } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) &&
+               !compressed) {
         /* VMware KB 2064959 explains that version 3 added support for
          * persistent changed block tracking (CBT), and backup software can
          * read it as version=1 if it doesn't care about the changed area
-- 
2.7.0