Re: [PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-12-02 Thread Vladimir Sementsov-Ogievskiy
07.11.2019 15:26, Vladimir Sementsov-Ogievskiy wrote: > 06.11.2019 22:19, Eric Blake wrote: >> On 10/18/19 9:36 AM, Vladimir Sementsov-Ogievskiy wrote: >> Maybe: if software doesn't know how to interpret the field, it may be safely ignored unless a corresponding incompatible fe

Re: [PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-11-07 Thread Vladimir Sementsov-Ogievskiy
06.11.2019 22:19, Eric Blake wrote: > On 10/18/19 9:36 AM, Vladimir Sementsov-Ogievskiy wrote: > >>> Maybe: >>> >>> if software doesn't know how to interpret the field, it may be safely >>> ignored unless a corresponding incompatible feature flag bit is set; >>> however, the field should be pres

Re: [PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-11-06 Thread Eric Blake
On 10/18/19 9:36 AM, Vladimir Sementsov-Ogievskiy wrote: Maybe: if software doesn't know how to interpret the field, it may be safely ignored unless a corresponding incompatible feature flag bit is set; however, the field should be preserved unchanged when rewriting the image header. + +For

Re: [PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-11-06 Thread Vladimir Sementsov-Ogievskiy
18.10.2019 17:36, Vladimir Sementsov-Ogievskiy wrote: > 18.10.2019 17:00, Eric Blake wrote: >> On 10/18/19 4:47 AM, Vladimir Sementsov-Ogievskiy wrote: >>> Make it more obvious how to add new fields to the version 3 header and >>> how to interpret them. >>> >>> The specification is adjusted so for

Re: [PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-10-18 Thread Vladimir Sementsov-Ogievskiy
18.10.2019 17:00, Eric Blake wrote: > On 10/18/19 4:47 AM, Vladimir Sementsov-Ogievskiy wrote: >> Make it more obvious how to add new fields to the version 3 header and >> how to interpret them. >> >> The specification is adjusted so for new defined optional fields: > > The specification is adjust

Re: [PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-10-18 Thread Eric Blake
On 10/18/19 4:47 AM, Vladimir Sementsov-Ogievskiy wrote: Make it more obvious how to add new fields to the version 3 header and how to interpret them. The specification is adjusted so for new defined optional fields: The specification is adjusted to make it clear that future fields are option

[PATCH v8 1/3] docs: improve qcow2 spec about extending image header

2019-10-18 Thread Vladimir Sementsov-Ogievskiy
Make it more obvious how to add new fields to the version 3 header and how to interpret them. The specification is adjusted so for new defined optional fields: 1. Software may support some of these optional fields and ignore the others, which means that features may be backported to downstream