To be used in the following commit without a forward declaration.
Signed-off-by: Anton Nefedov <[email protected]>
---
block/qcow2.c | 45 ++++++++++++++++++++++-----------------------
1 file changed, 22 insertions(+), 23 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index f522ba9..2ec8b03 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1946,6 +1946,28 @@ static bool merge_cow(uint64_t offset, unsigned bytes,
return false;
}
+static bool is_zero(BlockDriverState *bs, int64_t offset, int64_t bytes)
+{
+ int64_t nr;
+ int64_t res;
+ int64_t start;
+
+ /* Widen to sector boundaries, then clamp to image length, before
+ * checking status of underlying sectors */
+ start = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
+ bytes = QEMU_ALIGN_UP(offset + bytes, BDRV_SECTOR_SIZE) - start;
+
+ if (start + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) {
+ bytes = bs->total_sectors * BDRV_SECTOR_SIZE - start;
+ }
+
+ if (!bytes) {
+ return true;
+ }
+ res = bdrv_block_status_above(bs, NULL, start, bytes, &nr, NULL);
+ return res >= 0 && (res & BDRV_BLOCK_ZERO) && nr == bytes;
+}
+
/*
* If the specified area is beyond EOF, allocates it + prealloc_size
* bytes ahead.
@@ -3088,29 +3110,6 @@ finish:
return ret;
}
-
-static bool is_zero(BlockDriverState *bs, int64_t offset, int64_t bytes)
-{
- int64_t nr;
- int64_t res;
- int64_t start;
-
- /* Widen to sector boundaries, then clamp to image length, before
- * checking status of underlying sectors */
- start = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
- bytes = QEMU_ALIGN_UP(offset + bytes, BDRV_SECTOR_SIZE) - start;
-
- if (start + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) {
- bytes = bs->total_sectors * BDRV_SECTOR_SIZE - start;
- }
-
- if (!bytes) {
- return true;
- }
- res = bdrv_block_status_above(bs, NULL, start, bytes, &nr, NULL);
- return res >= 0 && (res & BDRV_BLOCK_ZERO) && nr == bytes;
-}
-
static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs,
int64_t offset, int bytes, BdrvRequestFlags flags)
{
--
2.7.4
