[Qemu-devel] [PATCH 1/4] block/parallels: extend parallels format header with actual data values

["Denis V. Lunev" <den@openvz.org>]

Parallels image format has several additional fields inside:
- nb_sectors is actually 64 bit wide. Upper 32bits are not used for
  images with signature "WithoutFreeSpace" and must be explicitely
  zeroed according to Parallels. They will be used for images with
  signature "WithouFreSpacExt"
- inuse is magic which means that the image is currently opened for
  read/write or was not closed correctly, the magic is 0x746f6e59
- data_off is the location of the first data block. It can be zero
  and in this case

This patch adds these values to struct parallels_header and adds
proper handling of nb_sectors for currently supported WithoutFreeSpace
images.

WithouFreSpacExt will be covered in the next patch.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/parallels.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index 1a5bd35..c44df87 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -41,8 +41,10 @@ struct parallels_header {
     uint32_t cylinders;
     uint32_t tracks;
     uint32_t catalog_entries;
-    uint32_t nb_sectors;
-    char padding[24];
+    uint64_t nb_sectors;
+    uint32_t inuse;
+    uint32_t data_off;
+    char padding[12];
 } QEMU_PACKED;
 
 typedef struct BDRVParallelsState {
@@ -90,7 +92,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
-    bs->total_sectors = le32_to_cpu(ph.nb_sectors);
+    bs->total_sectors = (uint32_t)le64_to_cpu(ph.nb_sectors);
 
     s->tracks = le32_to_cpu(ph.tracks);
     if (s->tracks == 0) {
-- 
1.9.1