[dm-devel] [PATCH v2 3/3] zonefs: fix synchronous write to sequential zone files

[Douglas Gilbert]

On 2021-04-19 2:45 a.m., Christoph Hellwig wrote:
> On Sat, Apr 17, 2021 at 11:33:23AM +0900, Damien Le Moal wrote:
>> Synchronous writes to sequential zone files cannot use zone append
>> operations if the underlying zoned device queue limit
>> max_zone_append_sectors is 0, indicating that the device does not
>> support this operation. In this case, fall back to using regular write
>> operations.
> 
> Zone append is a mandatory feature of the zoned device API.

So a hack required for ZNS and not needed by ZBC and ZAC becomes
a "mandatory feature" in a Linux API. Like many hacks, that one might
come back to bite you :-)

Doug Gilbert