[Qemu-devel] [PATCH v2 07/12] block/json: Add bdrv_co_get_block_status()

[Max Reitz <mreitz@redhat.com>]

Implement this function in the same way as raw_bsd does: Acknowledge
that this is a passthrough driver (always return BDRV_BLOCK_OFFSET_VALID
and BDRV_BLOCK_DATA and derive the offset directly from the sector
index) and add BDRV_BLOCK_RAW to the returned value.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/json.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/block/json.c b/block/json.c
index e4cdb68..966a5f5 100644
--- a/block/json.c
+++ b/block/json.c
@@ -110,6 +110,15 @@ static coroutine_fn int json_co_write_zeroes(BlockDriverState *bs,
     return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors, flags);
 }
 
+static coroutine_fn int64_t json_co_get_block_status(BlockDriverState *bs,
+                                                     int64_t sector_num,
+                                                     int nb_sectors, int *pnum)
+{
+    *pnum = nb_sectors;
+    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+           (sector_num << BDRV_SECTOR_BITS);
+}
+
 static void json_invalidate_cache(BlockDriverState *bs)
 {
     return bdrv_invalidate_cache(bs->file);
@@ -156,6 +165,7 @@ static BlockDriver bdrv_json = {
     .bdrv_aio_discard           = json_aio_discard,
 
     .bdrv_co_write_zeroes       = json_co_write_zeroes,
+    .bdrv_co_get_block_status   = json_co_get_block_status,
 
     .bdrv_invalidate_cache      = json_invalidate_cache,
 
-- 
1.9.0