Re: [Qemu-devel] [PATCH 10/17] block: define get_block_status return value

[Paolo Bonzini]

Il 03/07/2013 23:04, Peter Lieven ha scritto:
>> > Define the return value of get_block_status.  Bits 0, 1, 2 and 8-62
>> > are valid; bit 63 (the sign bit) is reserved for errors.  Bits 3-7
>> > are left for future extensions.
> Is Bit 8 not also reserved for future use? BDRV_SECTOR_BITS is 9.

Right.

> Can you explain which information is exactly returned in Bits 9-62?

Bits 9-62 are the offset at which the data is stored in bs->file, they
are valid if bit 2 (BDRV_BLOCK_OFFSET_VALID) is 1.

Paolo