blkgetsize64 ioctl

From: Ben LaHaise <[email protected]>

The patch below reserves an ioctl for getting the size in blocks of a device as a long long instead of long as the old ioctl did. The patch for this to e2fsprogs sneaked in a bit too early. There is a conflict with the ia64 get/set sector ioctls, but I that's less common than e2fsprogs.

+#define BLKGETSIZE64 _IO(0x12,109) /* return device size (long long *arg) */

There are more conflicts with the numbering.

But more interestingly, I don't think we need the size in blocks. We need the size in bytes.

(In 32-bit space we need the 8 or 9 or 10 bits extra provided by counting blocks instead of bytes, but it causes quite a few problems. In 64-bit space we can avoid all problems and work in bytes. (Or even in bits.))

Andries