Re: [f2fs-dev] [PATCH] f2fs: introduce nosmall_discard mount option

Chao Yu
2021-07-31T00:48:33Z

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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