linux-kernel - Re: [PATCH v2] f2fs: fix to return -EOPNOTSUPP for uncached write

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Message-ID: <9c7ef111-548c-4751-af9f-335563bda263@kernel.org>
Date: Wed, 6 Aug 2025 09:51:21 +0800
From: Chao Yu <chao@...nel.org>
To: Jens Axboe <axboe@...nel.dk>, jaegeuk@...nel.org
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-kernel@...r.kernel.org, Qi Han <hanqi@...o.com>
Subject: Re: [PATCH v2] f2fs: fix to return -EOPNOTSUPP for uncached write

On 8/5/25 23:37, Jens Axboe wrote:
> On 8/5/25 12:19 AM, Chao Yu wrote:
>> f2fs doesn't support uncached write yet, for write() w/ IOCB_DONTCACHE
>> flag, let's return -EOPNOTSUPP instead of ignoring IOCB_DONTCACHE flag
>> and write w/o uncached IO.
> 
> Didn't we agree that write support should be pursued first before
> bifurcating the read/write DONTCACHE support?

Yeah, no worries, this is just used for test purpose, will drop this once
Qi Han prepare the new patchset supporting dontcache in both read and write
path. :)

Thanks,