linux-kernel - Re: [PATCH v2 4/4] f2fs: stop checkpoint when get a out-of-bounds segment

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Date: Mon, 19 Feb 2024 15:14:41 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>, Zhiguo Niu <zhiguo.niu@...soc.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
 niuzhiguo84@...il.com, ke.wang@...soc.com, hongyu.jin@...soc.com
Subject: Re: [PATCH v2 4/4] f2fs: stop checkpoint when get a out-of-bounds
 segment

On 2024/2/8 8:16, Jaegeuk Kim wrote:
> On 02/07, Zhiguo Niu wrote:
>> There is low probability that an out-of-bounds segment will be got
>> on a small-capacity device. In order to prevent subsequent write requests
>> allocating block address from this invalid segment, which may cause
>> unexpected issue, stop checkpoint should be performed.
>>
>> Also introduce a new stop cp reason:  STOP_CP_REASON_OUTOF_RAGNE.
> 
> OUT_OF_RANGE?

Maybe STOP_CP_REASON_NO_SEGMENT will be more explicit?

Thanks,

> 
>>
>> Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
>> ---
>>   fs/f2fs/segment.c       | 12 ++++++++++--
>>   include/linux/f2fs_fs.h |  1 +
>>   2 files changed, 11 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index 6772ad4..6fe2baf 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -2666,7 +2666,11 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>>   		if (dir == ALLOC_RIGHT) {
>>   			secno = find_first_zero_bit(free_i->free_secmap,
>>   							MAIN_SECS(sbi));
>> -			f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
>> +			if (secno >= MAIN_SECS(sbi)) {
>> +				f2fs_stop_checkpoint(sbi, false,
>> +						STOP_CP_REASON_OUTOF_RAGNE);
>> +				f2fs_bug_on(sbi, 1);
>> +			}
>>   		} else {
>>   			go_left = 1;
>>   			left_start = hint - 1;
>> @@ -2682,7 +2686,11 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>>   		}
>>   		left_start = find_first_zero_bit(free_i->free_secmap,
>>   							MAIN_SECS(sbi));
>> -		f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
>> +		if (left_start >= MAIN_SECS(sbi)) {
>> +			f2fs_stop_checkpoint(sbi, false,
>> +					STOP_CP_REASON_OUTOF_RAGNE);
>> +			f2fs_bug_on(sbi, 1);
>> +		}
>>   		break;
>>   	}
>>   	secno = left_start;
>> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
>> index 053137a0..72c6782 100644
>> --- a/include/linux/f2fs_fs.h
>> +++ b/include/linux/f2fs_fs.h
>> @@ -81,6 +81,7 @@ enum stop_cp_reason {
>>   	STOP_CP_REASON_CORRUPTED_SUMMARY,
>>   	STOP_CP_REASON_UPDATE_INODE,
>>   	STOP_CP_REASON_FLUSH_FAIL,
>> +	STOP_CP_REASON_OUTOF_RAGNE,
>>   	STOP_CP_REASON_MAX,
>>   };
>>   
>> -- 
>> 1.9.1