[sheepdog] [PATCH] sheepdog: fix 'qemu-img map'

[Liu Yuan]

It was muted in the previous commit 4bc74be9. Let's revive it since nothing
prevents us to do it.

With this patch, following command will work as other formats:

$ qemu-img map sheepdog:image

Cc: qemu-devel at nongnu.org
Cc: Kevin Wolf <kwolf at redhat.com>
Cc: Stefan Hajnoczi <stefanha at redhat.com>
Signed-off-by: Liu Yuan <namei.unix at gmail.com>
---
 block/sheepdog.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index b94ab6e..61aead0 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2442,11 +2442,12 @@ sd_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 {
     BDRVSheepdogState *s = bs->opaque;
     SheepdogInode *inode = &s->inode;
-    unsigned long start = sector_num * BDRV_SECTOR_SIZE / SD_DATA_OBJ_SIZE,
+    uint64_t offset = sector_num * BDRV_SECTOR_SIZE;
+    unsigned long start = offset / SD_DATA_OBJ_SIZE,
                   end = DIV_ROUND_UP((sector_num + nb_sectors) *
                                      BDRV_SECTOR_SIZE, SD_DATA_OBJ_SIZE);
     unsigned long idx;
-    int64_t ret = BDRV_BLOCK_DATA;
+    int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
 
     for (idx = start; idx < end; idx++) {
         if (inode->data_vdi_id[idx] == 0) {
-- 
1.8.1.2