linux-kernel - Re: [PATCH 2/4] f2fs: fix to don't call f2fs_stop

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Date: Wed, 28 Feb 2024 09:23:05 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] f2fs: fix to don't call f2fs_stop_checkpoint in
 spinlock coverage

On 2024/2/28 1:50, Jaegeuk Kim wrote:
> On 02/22, Chao Yu wrote:
>> f2fs_stop_checkpoint(, false) is complex and it may sleep, so we should
>> move it outside segmap_lock spinlock coverage in get_new_segment().
> 
> Chao, I merged this patch into
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev-test&id=f3b576d209983b5d6e1cb130bfc8ca1f0bbcad6d

It's fine to me.

Thanks,

> 
>>
>> Signed-off-by: Chao Yu <chao@...nel.org>
>> ---
>>   fs/f2fs/segment.c | 12 +++++++++---
>>   1 file changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index d0209ea77dd2..8edc42071e6f 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -2646,6 +2646,7 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>>   	unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
>>   	bool init = true;
>>   	int i;
>> +	int ret = 0;
>>   
>>   	spin_lock(&free_i->segmap_lock);
>>   
>> @@ -2671,9 +2672,8 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>>   		secno = find_first_zero_bit(free_i->free_secmap,
>>   							MAIN_SECS(sbi));
>>   		if (secno >= MAIN_SECS(sbi)) {
>> -			f2fs_stop_checkpoint(sbi, false,
>> -				STOP_CP_REASON_NO_SEGMENT);
>> -			f2fs_bug_on(sbi, 1);
>> +			ret = -ENOSPC;
>> +			goto out_unlock;
>>   		}
>>   	}
>>   	segno = GET_SEG_FROM_SEC(sbi, secno);
>> @@ -2704,7 +2704,13 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>>   	f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
>>   	__set_inuse(sbi, segno);
>>   	*newseg = segno;
>> +out_unlock:
>>   	spin_unlock(&free_i->segmap_lock);
>> +
>> +	if (ret) {
>> +		f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_NO_SEGMENT);
>> +		f2fs_bug_on(sbi, 1);
>> +	}
>>   }
>>   
>>   static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
>> -- 
>> 2.40.1