Messages in this thread | | | From | "Andreas Hindborg (Samsung)" <> | Subject | Re: [PATCH] zonefs: do not use append if device does not support it | Date | Mon, 26 Jun 2023 20:23:48 +0200 |
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Johannes Thumshirn <Johannes.Thumshirn@wdc.com> writes:
> On 26.06.23 18:47, Andreas Hindborg wrote: >> From: "Andreas Hindborg (Samsung)" <nmi@metaspace.dk> >> >> Zonefs will try to use `zonefs_file_dio_append()` for direct sync writes even if >> device `max_zone_append_sectors` is zero. This will cause the IO to fail as the >> io vector is truncated to zero. It also causes a call to >> `invalidate_inode_pages2_range()` with end set to UINT_MAX, which is probably >> not intentional. Thus, do not use append when device does not support it. >> > > I'm sorry but I think it has been stated often enough that for Linux Zone Append > is a mandatory feature for a Zoned Block Device. Therefore this path is essentially > dead code as max_zone_append_sectors will always be greater than zero. > > So this is a clear NAK from my side.
OK, thanks for clarifying 👍 I came across this bugging out while playing around with zone append for ublk. The code makes sense if the stack expects append to always be present.
I didn't follow the discussion, could you reiterate why the policy is that zoned devices _must_ support append?
Best regards, Andreas
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