Am 04.07.2013 um 10:13 schrieb Paolo Bonzini <pbonz...@redhat.com>: > 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.
Ok, so this is if bs->file is not linear? If we return the offset into bs->file this would only make sense if the data at that position is raw and not encoded otherwise and if *pnum is limited to the size of the extend at that position, right? I currently do not understand for what operation this info is needed. Maybe you could add some info to the commit or the function including your comment from above. Thanks, Peter
