diff options
| -rw-r--r-- | include/block/block.h | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/include/block/block.h b/include/block/block.h index f85e3a6ed3..4e0871aaf9 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -43,11 +43,12 @@ typedef struct BlockFragInfo { typedef enum { BDRV_REQ_COPY_ON_READ = 0x1, BDRV_REQ_ZERO_WRITE = 0x2, - /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver - * is allowed to optimize a write zeroes request by unmapping (discarding) - * blocks if it is guaranteed that the result will read back as - * zeroes. The flag is only passed to the driver if the block device is - * opened with BDRV_O_UNMAP. + + /* + * The BDRV_REQ_MAY_UNMAP flag is used in write_zeroes requests to indicate + * that the block driver should unmap (discard) blocks if it is guaranteed + * that the result will read back as zeroes. The flag is only passed to the + * driver if the block device is opened with BDRV_O_UNMAP. */ BDRV_REQ_MAY_UNMAP = 0x4, |