diff options
Diffstat (limited to 'include/block/block.h')
-rw-r--r-- | include/block/block.h | 10 |
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: |