Re: [Qemu-devel] [PATCH v10 01/10] allow writing to the backing file

2015-10-29 Thread Wen Congyang
On 10/10/2015 03:07 AM, Eric Blake wrote: > On 09/25/2015 12:17 AM, Wen Congyang wrote: >> For block replication, we have such backing chain: >> secondary disk <-- hidden disk <-- active disk >> secondary disk is top BDS(use bacing reference), so it can be opened in > > s/BDS(use bacing/BDS (u

Re: [Qemu-devel] [PATCH v10 01/10] allow writing to the backing file

2015-10-09 Thread Eric Blake
On 09/25/2015 12:17 AM, Wen Congyang wrote: > For block replication, we have such backing chain: > secondary disk <-- hidden disk <-- active disk > secondary disk is top BDS(use bacing reference), so it can be opened in s/BDS(use bacing/BDS (use backing/ > read-write mode. But hidden disk is

[Qemu-devel] [PATCH v10 01/10] allow writing to the backing file

2015-09-24 Thread Wen Congyang
For block replication, we have such backing chain: secondary disk <-- hidden disk <-- active disk secondary disk is top BDS(use bacing reference), so it can be opened in read-write mode. But hidden disk is read only, and we need to write to hidden disk(backup job will write data to it). TODO: