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-rw-r--r--include/block/block.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h
index c9d7c58..5b81e33 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -143,6 +143,16 @@ typedef struct HDGeometry {
#define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS)
/*
+ * We want allow aligning requests and disk length up to any 32bit alignment
+ * and don't afraid of overflow.
+ * To achieve it, and in the same time use some pretty number as maximum disk
+ * size, let's define maximum "length" (a limit for any offset/bytes request and
+ * for disk size) to be the greatest power of 2 less than INT64_MAX.
+ */
+#define BDRV_MAX_ALIGNMENT (1L << 30)
+#define BDRV_MAX_LENGTH (QEMU_ALIGN_DOWN(INT64_MAX, BDRV_MAX_ALIGNMENT))
+
+/*
* Allocation status flags for bdrv_block_status() and friends.
*
* Public flags: