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Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce nosmall_discard mount option
To:     Jaegeuk Kim <jaegeuk@kernel.org>
Cc:     Chao Yu <chao.yu@linux.dev>, linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net
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From:   Chao Yu <chao@kernel.org>
Message-ID: <fe768d28-db69-707a-0f95-4f1bf9f48b1e@kernel.org>
Date:   Sat, 31 Jul 2021 08:48:16 +0800
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On 2021/7/31 8:42, Jaegeuk Kim wrote:
> On 07/31, Chao Yu wrote:
>> On 2021/7/31 7:41, Chao Yu wrote:
>>> On 2021/7/31 2:28, Jaegeuk Kim wrote:
>>>> how about adding "discard_gran=[small|segment|section]", and keeping discard_map
>>>> in the small case only? And, I think we should set the section mode for zoned
>>>> device automatically.
>>>
>>> Yup, better,
>>>
>>> About the naming, it look discard_gran is not clear here, since there is another
>>> sysfs entry /sys/fs/f2fs/<devname>/discard_granularity has the same name, and
>>> also semantics of newly added mount option is not only control the smallest discard
>>> size, but also indicate discard start offset should be aligned to segment or section.
>>> So how about using: "aligned_discard=[none|segment|section]" instead?
>>
>> Maybe: "aligned_discard=[block|segment|section]"?
> 
> How about discard_unit? I feel that issuing discards in one of those unit
> indicate the offset.

Looks fine to me, let me update the patch.

Thanks,

> 
>>
>>>
>>> Thanks,
>>>
>>>
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>>>