block: Convert bdrv_get_allocated_file_size() to co_wrapper

bdrv_get_allocated_file_size() is categorized as an I/O function, and it
currently doesn't run in a coroutine. We should let it take a graph
rdlock since it traverses the block nodes graph, which however is only
possible in a coroutine.

Therefore turn it into a co_wrapper to move the actual function into a
coroutine where the lock can be taken.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230113204212.359076-10-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/block.c b/block.c
index ee6f90990e..15a26e8345 100644
--- a/block.c
+++ b/block.c
@@ -5720,7 +5720,7 @@ exit:
 }
 
 /**
- * Implementation of BlockDriver.bdrv_get_allocated_file_size() that
+ * Implementation of BlockDriver.bdrv_co_get_allocated_file_size() that
  * sums the size of all data-bearing children.  (This excludes backing
  * children.)
  */
@@ -5733,7 +5733,7 @@ static int64_t bdrv_sum_allocated_file_size(BlockDriverState *bs)
         if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA |
                            BDRV_CHILD_FILTERED))
         {
-            child_size = bdrv_get_allocated_file_size(child->bs);
+            child_size = bdrv_co_get_allocated_file_size(child->bs);
             if (child_size < 0) {
                 return child_size;
             }
@@ -5748,7 +5748,7 @@ static int64_t bdrv_sum_allocated_file_size(BlockDriverState *bs)
  * Length of a allocated file in bytes. Sparse files are counted by actual
  * allocated space. Return < 0 if error or unknown.
  */
-int64_t bdrv_get_allocated_file_size(BlockDriverState *bs)
+int64_t coroutine_fn bdrv_co_get_allocated_file_size(BlockDriverState *bs)
 {
     BlockDriver *drv = bs->drv;
     IO_CODE();
@@ -5756,8 +5756,8 @@ int64_t bdrv_get_allocated_file_size(BlockDriverState *bs)
     if (!drv) {
         return -ENOMEDIUM;
     }
-    if (drv->bdrv_get_allocated_file_size) {
-        return drv->bdrv_get_allocated_file_size(bs);
+    if (drv->bdrv_co_get_allocated_file_size) {
+        return drv->bdrv_co_get_allocated_file_size(bs);
     }
 
     if (drv->bdrv_file_open) {
@@ -5769,7 +5769,7 @@ int64_t bdrv_get_allocated_file_size(BlockDriverState *bs)
         return -ENOTSUP;
     } else if (drv->is_filter) {
         /* Filter drivers default to the size of their filtered child */
-        return bdrv_get_allocated_file_size(bdrv_filter_bs(bs));
+        return bdrv_co_get_allocated_file_size(bdrv_filter_bs(bs));
     } else {
         /* Other drivers default to summing their children's sizes */
         return bdrv_sum_allocated_file_size(bs);