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SubjectRe: [f2fs-dev] [PATCH] f2fs: fix checkpoint mount option wrong combination
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On 2021/2/1 21:11, Daeho Jeong wrote:
> Actually, I think we need to select one among them, disable, enable
> and merge. I realized my previous understanding about that was wrong.

Actually,
1. chekcpoint=enable/disable decide whether we will allow checkpoint
2. checkpoint=merge or not decide how we issue checkpoint

They are different, we should not only select only one of them, the
combination of them is allowed.

Thanks,

> In that case of "checkpoint=merge,checkpoint=enable", the last option
> will override the ones before that.
> This is how the other mount options like fsync_mode, whint_mode and etc.
> So, the answer will be "checkpoint=enable". What do you think?
>
>
>
> 2021년 2월 1일 (월) 오후 9:40, Chao Yu <chao@kernel.org>님이 작성:
>>
>> On 2021/2/1 8:06, Daeho Jeong wrote:
>>> From: Daeho Jeong <daehojeong@google.com>
>>>
>>> As checkpoint=merge comes in, mount option setting related to
>>> checkpoint had been mixed up. Fixed it.
>>>
>>> Signed-off-by: Daeho Jeong <daehojeong@google.com>
>>> ---
>>> fs/f2fs/super.c | 11 +++++------
>>> 1 file changed, 5 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index 56696f6cfa86..8231c888c772 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -930,20 +930,25 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
>>> return -EINVAL;
>>> F2FS_OPTION(sbi).unusable_cap_perc = arg;
>>> set_opt(sbi, DISABLE_CHECKPOINT);
>>> + clear_opt(sbi, MERGE_CHECKPOINT);
>>> break;
>>> case Opt_checkpoint_disable_cap:
>>> if (args->from && match_int(args, &arg))
>>> return -EINVAL;
>>> F2FS_OPTION(sbi).unusable_cap = arg;
>>> set_opt(sbi, DISABLE_CHECKPOINT);
>>> + clear_opt(sbi, MERGE_CHECKPOINT);
>>> break;
>>> case Opt_checkpoint_disable:
>>> set_opt(sbi, DISABLE_CHECKPOINT);
>>> + clear_opt(sbi, MERGE_CHECKPOINT);
>>> break;
>>> case Opt_checkpoint_enable:
>>> clear_opt(sbi, DISABLE_CHECKPOINT);
>>> + clear_opt(sbi, MERGE_CHECKPOINT);
>>
>> What if: -o checkpoint=merge,checkpoint=enable
>>
>> Can you please explain the rule of merge/disable/enable combination and their
>> result? e.g.
>> checkpoint=merge,checkpoint=enable
>> checkpoint=enable,checkpoint=merge
>> checkpoint=merge,checkpoint=disable
>> checkpoint=disable,checkpoint=merge
>>
>> If the rule/result is clear, it should be documented.
>>
>> Thanks,
>>
>>
>>> break;
>>> case Opt_checkpoint_merge:
>>> + clear_opt(sbi, DISABLE_CHECKPOINT);
>>> set_opt(sbi, MERGE_CHECKPOINT);
>>> break;
>>> #ifdef CONFIG_F2FS_FS_COMPRESSION
>>> @@ -1142,12 +1147,6 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
>>> return -EINVAL;
>>> }
>>>
>>> - if (test_opt(sbi, DISABLE_CHECKPOINT) &&
>>> - test_opt(sbi, MERGE_CHECKPOINT)) {
>>> - f2fs_err(sbi, "checkpoint=merge cannot be used with checkpoint=disable\n");
>>> - return -EINVAL;
>>> - }
>>> -
>>> /* Not pass down write hints if the number of active logs is lesser
>>> * than NR_CURSEG_PERSIST_TYPE.
>>> */
>>>
>
>
> _______________________________________________
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> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>

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