在 2024/10/22 11:39, Chao Yu 写道:
> On 2024/10/22 11:14, 韩棋 wrote:
>> 在 2024/10/22 10:53, Chao Yu 写道:
>>> On 2024/10/9 18:27, Qi Han wrote:
>>>> When the free segment is used up during CP disable, many write or
>>>> ioctl operations will get ENOSPC error codes, even if there are
>>>> still many blocks available. We can reproduce it in the following
>>>> steps:
>>>>
>>>> dd if=/dev/zero of=f2fs.img bs=1M count=55
>>>> mkfs.f2fs -f f2fs.img
>>>> mount f2fs.img f2fs_dir -o checkpoint=disable:10%
>>>> cd f2fs_dir
>>>> dd if=/dev/zero of=bigfile bs=1M count=50
>>>> sync
>>>> rm bigfile
>>>> i=1; while [[ $i -lt 10000000 ]]; do (file_name=./file$i; dd \
>>>> if=/dev/random of=$file_name bs=1M count=0); i=$((i+1)); done
>>>> stat -f ./
>>>>
>>>> In f2fs_need_SSR() function, it is allowed to use SSR to allocate
>>>> blocks when CP is disabled, so in f2fs_is_checkpoint_ready function,
>>>> can we judge the number of invalid blocks when free segment is not
>>>> enough, and return ENOSPC only if the number of invalid blocks is
>>>> also not enough?
>>>>
>>>> Signed-off-by: Qi Han <ha...@vivo.com>
>>>> ---
>>>> fs/f2fs/segment.h | 21 +++++++++++++++++++++
>>>> 1 file changed, 21 insertions(+)
>>>>
>>>> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
>>>> index 71adb4a43bec..9bf0cf3a6a31 100644
>>>> --- a/fs/f2fs/segment.h
>>>> +++ b/fs/f2fs/segment.h
>>>> @@ -637,12 +637,33 @@ static inline bool has_enough_free_secs(struct
>>>> f2fs_sb_info *sbi,
>>>> return !has_not_enough_free_secs(sbi, freed, needed);
>>>> }
>>>> +static inline bool has_enough_available_blocks(struct f2fs_sb_info
>>>> *sbi)
>>>> +{
>>>> + unsigned int total_free_blocks = sbi->user_block_count -
>>>> + valid_user_blocks(sbi) -
>>>> + sbi->current_reserved_blocks;
>>>> +
>>>> + if (total_free_blocks <= sbi->unusable_block_count)
>>>> + total_free_blocks = 0;
>>>> + else
>>>> + total_free_blocks -= sbi->unusable_block_count;
>>>> +
>>>> + if (total_free_blocks > F2FS_OPTION(sbi).root_reserved_blocks)
>>>> + total_free_blocks -= F2FS_OPTION(sbi).root_reserved_blocks;
>>>> + else
>>>> + total_free_blocks = 0;
>>>> +
>>>> + return (total_free_blocks > 0) ? true : false;
>>>
>>> Can you please reuse get_available_block_count() as much as possible?
>>> and cover it w/ stat_lock?
>>>
>>> Thanks,
>>
>> Thank you for your suggestion. I will send the v2 version patch later.
>
> BTW, it looks your testcase won't create sparse available space in
> segment for following reuse by SSR, can you please update your
> testcase?
>
> Thanks,
Okay, I got it. I'll update later. Thank you for your advice.
>
>>
>>>
>>>> +}
>>>> +
>>>> static inline bool f2fs_is_checkpoint_ready(struct f2fs_sb_info
>>>> *sbi)
>>>> {
>>>> if (likely(!is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
>>>> return true;
>>>> if (likely(has_enough_free_secs(sbi, 0, 0)))
>>>> return true;
>>>> + if (likely(has_enough_available_blocks(sbi)))
>>>> + return true;
>>>> return false;
>>>> }
>>>
>>>
>>
>
>
_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
