On 10/14/20 6:52 AM, Vladimir Sementsov-Ogievskiy wrote: >> docs/interop/nbd.txt | 27 ++++++++++--- > > [..] > >> +In the allocation depth context, bits 0 and 1 form a tri-state value: >> + >> + bits 0-1: 00: NBD_STATE_DEPTH_UNALLOC, the extent is unallocated >> + 01: NBD_STATE_DEPTH_LOCAL, the extent is allocated in the >> + top level of the image > > Hmm. I always thought that "image" == file, so backing chain is a chain > of images, > not a several levels of one image. If it is so, than it should be "the > top level image". > And "levels of the image" may designate internal qcow2 snapshots > unrelated here..
It's fuzzy. From the guest point of view, we are serving a single guest image by use of multiple files in the host. I will do s/level/layer/, to match the wording I already had on the next line: > 10: NBD_STATE_DEPTH_BACKING, the extent is inherited from a > backing layer -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
