On Thu, Dec 14, 2023 at 09:37:21AM +0900, Damien Le Moal wrote: > Yes, that can be trivially done with the sd_zbc.c zone append emulation. If you > check the code, you'll see that sd_zbc_prepare_zone_append() returns > BLK_STS_ZONE_RESOURCE if the target zone is already locked. That causes a > requeue and the zone append to be resubmitted later. All you need to do for UFS > devices is tweak that to not requeue the zone append if the write command used > to emulate it can be issued. The completion path will also, of course, need some > tweaks to not attempt to unlock the target zone if it was not locked. On the Linux side yes. I still don't see how the hardware can actually make this scheme work withou the potential of deadlocks. But compared to the problems with having a completely in-order I/O stacks that's peanuts as they say in Germany.
