On 9/17/25 16:13, Liao Yuanhong wrote:
>
> On 9/17/2025 3:57 PM, Chao Yu wrote:
>> On 9/17/25 15:08, Liao Yuanhong wrote:
>>> On 9/15/2025 4:36 PM, Chao Yu wrote:
>>>> On 9/9/25 21:44, Liao Yuanhong wrote:
>>>>> When the proportion of dirty segments within a section exceeds the
>>>>> valid_thresh_ratio, the gc_cost of that section is set to UINT_MAX,
>>>>> indicating that these sections should not be released. However, if all
>>>>> section costs within the scanning range of get_victim() are UINT_MAX,
>>>>> background GC will still occur. Add a condition to prevent this situation.
>>>> For this case, f2fs_get_victim() will return 0, and f2fs_gc() will use
>>>> unchanged
>>>> segno for GC?
>>>>
>>>> Thanks,
>>> You're right, segno won't update in this scenario, and this patch feature
>>> is redundant.
>> Oh, I meant, if f2fs_get_victim() fails to select a valid victim due to the
>> reason you
>> described, f2fs_get_victim() will return 0, and f2fs_gc() will migrate
>> segment #NULL_SEGNO?
>> Or am I missing something?
>>
>> Thanks,
>
> Yes. In this scenario, since it won't enter the|p.min_cost >
> cost|condition,|p.min_segno|will retain its initial value|||NULL_SEGNO|. This
> is consistent with what you described.
Do you have a script to reproduce this bug?
Thanks,
>
>
> Thanks,
>
> Liao
>
>>>
>>> Thanks,
>>>
>>> Liao
>>>
>>>>> Signed-off-by: Liao Yuanhong <liaoyuanh...@vivo.com>
>>>>> ---
>>>>> fs/f2fs/gc.c | 5 +++++
>>>>> 1 file changed, 5 insertions(+)
>>>>>
>>>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>>>>> index 4a8c08f970e3..ffc3188416f4 100644
>>>>> --- a/fs/f2fs/gc.c
>>>>> +++ b/fs/f2fs/gc.c
>>>>> @@ -936,6 +936,11 @@ int f2fs_get_victim(struct f2fs_sb_info *sbi,
>>>>> unsigned int *result,
>>>>> }
>>>>> }
>>>>> + if (f2fs_sb_has_blkzoned(sbi) && p.min_cost == UINT_MAX) {
>>>>> + ret = -ENODATA;
>>>>> + goto out;
>>>>> + }
>>>>> +
>>>>> /* get victim for GC_AT/AT_SSR */
>>>>> if (is_atgc) {
>>>>> lookup_victim_by_age(sbi, &p);
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