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Is it designed intentionally? > Yes that is my intent. I specifically called that out in patch 18. https://lore.kernel.org/all/20240324-dcd-type2-upstream-v1-18-b7b00d623625@intel.com/ I thought we discussed this in one of the collaboration calls. Mainly this is to simplify by not attempting any split of the extents the host is tracking. It really is expected that the FM/device is going to keep those extents offered and release them in their entirety. I understand this may complicate the device because it may see a release of memory prior to the request of that release. And perhaps this complicates the device. But in that case it (or the FM really) should not attempt to release partial extents. Ira [snip]