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.
>
>> +}
>> +
>> 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;
>> }
>
>
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