[Qemu-devel] [PATCH v4 3/4] block: Simplify use of BDRV_BLOCK_RAW

[Eric Blake <eblake@redhat.com>]

The lone caller that cares about a return of BDRV_BLOCK_RAW
(namely, io.c:bdrv_co_get_block_status) completely replaces the
return value, so there is no point in passing BDRV_BLOCK_DATA.

Signed-off-by: Eric Blake <eblake@redhat.com>

---
v3: further document BDRV_BLOCK_RAW
v2: fix subject, tweak commit message
---
 include/block/block.h | 6 +++---
 block/commit.c        | 2 +-
 block/mirror.c        | 2 +-
 block/raw-format.c    | 2 +-
 block/vpc.c           | 2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/block/block.h b/include/block/block.h
index 9b355e9..0a60444 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -131,9 +131,9 @@ typedef struct HDGeometry {
  *                       layer (short for DATA || ZERO), set by block layer
  *
  * Internal flag:
- * BDRV_BLOCK_RAW: used internally to indicate that the request was
- *                 answered by a passthrough driver such as raw and that the
- *                 block layer should recompute the answer from bs->file.
+ * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request
+ *                 that the block layer recompute the answer from the returned
+ *                 BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID.
  *
  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 (BDRV_BLOCK_OFFSET_MASK)
  * represent the offset in the returned BDS that is allocated for the
diff --git a/block/commit.c b/block/commit.c
index a3028b2..f56745b 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -239,7 +239,7 @@ static int64_t coroutine_fn bdrv_commit_top_get_block_status(
 {
     *pnum = nb_sectors;
     *file = bs->backing->bs;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
            (sector_num << BDRV_SECTOR_BITS);
 }

diff --git a/block/mirror.c b/block/mirror.c
index a2a9703..892d53a 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1052,7 +1052,7 @@ static int64_t coroutine_fn bdrv_mirror_top_get_block_status(
 {
     *pnum = nb_sectors;
     *file = bs->backing->bs;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
            (sector_num << BDRV_SECTOR_BITS);
 }

diff --git a/block/raw-format.c b/block/raw-format.c
index 36e6503..1136eba 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -259,7 +259,7 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
     *pnum = nb_sectors;
     *file = bs->file->bs;
     sector_num += s->offset / BDRV_SECTOR_SIZE;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
            (sector_num << BDRV_SECTOR_BITS);
 }

diff --git a/block/vpc.c b/block/vpc.c
index 4240ba9..b313c68 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -701,7 +701,7 @@ static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
     if (be32_to_cpu(footer->type) == VHD_FIXED) {
         *pnum = nb_sectors;
         *file = bs->file->bs;
-        return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+        return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
                (sector_num << BDRV_SECTOR_BITS);
     }

-- 
2.9.4