Re: [PATCH v7 00/11] Introduce Zone Append for writing to zoned block devices

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On Fri, Apr 17, 2020 at 09:15:25PM +0900, Johannes Thumshirn wrote:
> The upcoming NVMe ZNS Specification will define a new type of write
> command for zoned block devices, zone append.
> 
> When when writing to a zoned block device using zone append, the start
> sector of the write is pointing at the start LBA of the zone to write to.
> Upon completion the block device will respond with the position the data
> has been placed in the zone. This from a high level perspective can be
> seen like a file system's block allocator, where the user writes to a
> file and the file-system takes care of the data placement on the device.

What sort of reordering can take place due to I/O schedulers and or
racing write appends from different CPU's?  Is it purely the
userspace's responsibility to avoid racings writes to a particular
zone?

						- Ted



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