[RFC PATCH 12/23] qcow2: Handle QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER

[Alberto Garcia]

In the previous patch we added a new QCow2ClusterType named
QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER. There is a couple of places
where this new value needs to be handled, and that is what this patch
does.

Signed-off-by: Alberto Garcia <be...@igalia.com>
---
 block/qcow2.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 131711d6fa..c222cd261d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1922,8 +1922,8 @@ static int coroutine_fn 
qcow2_co_block_status(BlockDriverState *bs,
 
     *pnum = bytes;
 
-    if ((ret == QCOW2_CLUSTER_NORMAL || ret == QCOW2_CLUSTER_ZERO_ALLOC) &&
-        !s->crypto) {
+    if ((ret == QCOW2_CLUSTER_NORMAL || ret == QCOW2_CLUSTER_ZERO_ALLOC ||
+         ret == QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER) && !s->crypto) {
         index_in_cluster = offset & (s->cluster_size - 1);
         *map = cluster_offset | index_in_cluster;
         *file = s->data_file->bs;
@@ -1931,7 +1931,8 @@ static int coroutine_fn 
qcow2_co_block_status(BlockDriverState *bs,
     }
     if (ret == QCOW2_CLUSTER_ZERO_PLAIN || ret == QCOW2_CLUSTER_ZERO_ALLOC) {
         status |= BDRV_BLOCK_ZERO;
-    } else if (ret != QCOW2_CLUSTER_UNALLOCATED) {
+    } else if (ret != QCOW2_CLUSTER_UNALLOCATED &&
+               ret != QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER) {
         status |= BDRV_BLOCK_DATA;
     }
     if (s->metadata_preallocation && (status & BDRV_BLOCK_DATA) &&
@@ -2009,6 +2010,7 @@ static coroutine_fn int 
qcow2_co_preadv_part(BlockDriverState *bs,
 
         switch (ret) {
         case QCOW2_CLUSTER_UNALLOCATED:
+        case QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER:
 
             if (bs->backing) {
                 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
@@ -3542,6 +3544,7 @@ static coroutine_fn int 
qcow2_co_pwrite_zeroes(BlockDriverState *bs,
         nr = s->cluster_size;
         ret = qcow2_get_cluster_offset(bs, offset, &nr, &off);
         if (ret != QCOW2_CLUSTER_UNALLOCATED &&
+            ret != QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER &&
             ret != QCOW2_CLUSTER_ZERO_PLAIN &&
             ret != QCOW2_CLUSTER_ZERO_ALLOC) {
             qemu_co_mutex_unlock(&s->lock);
@@ -3612,6 +3615,7 @@ qcow2_co_copy_range_from(BlockDriverState *bs,
 
         switch (ret) {
         case QCOW2_CLUSTER_UNALLOCATED:
+        case QCOW2_CLUSTER_UNALLOCATED_SUBCLUSTER:
             if (bs->backing && bs->backing->bs) {
                 int64_t backing_length = bdrv_getlength(bs->backing->bs);
                 if (src_offset >= backing_length) {
-- 
2.20.1