linux-kernel - Re: [PATCH v2 1/2] f2fs: zone: fix to calculate first_zoned

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Message-ID: <07b34613-abe0-49f9-9530-503558088fb5@kernel.org>
Date: Fri, 28 Mar 2025 12:02:03 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-kernel@...r.kernel.org, Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [PATCH v2 1/2] f2fs: zone: fix to calculate first_zoned_segno
 correctly

On 2025/3/28 11:29, Jaegeuk Kim wrote:
> It seems this patch breaks the multi-partition cases.

Let me take a look.

Thanks,

> 
> On 03/25, Chao Yu wrote:
>> A zoned device can has both conventional zones and sequential zones,
>> so we should not treat first segment of zoned device as first_zoned_segno,
>> instead, we need to check zone type for each zone during traversing zoned
>> device to find first_zoned_segno.
>>
>> Otherwise, for below case, first_zoned_segno will be 0, which could be
>> wrong.
>>
>> create_null_blk 512 2 1024 1024
>> mkfs.f2fs -m /dev/nullb0
>>
>> Fixes: 9703d69d9d15 ("f2fs: support file pinning for zoned devices")
>> Cc: Daeho Jeong <daehojeong@...gle.com>
>> Signed-off-by: Chao Yu <chao@...nel.org>
>> ---
>> v2:
>> - traverse w/ zone unit in get_first_zoned_segno()
>>   fs/f2fs/f2fs.h    | 18 +++++++++++++-----
>>   fs/f2fs/segment.c |  2 +-
>>   fs/f2fs/super.c   | 37 +++++++++++++++++++++++++++++++++----
>>   3 files changed, 47 insertions(+), 10 deletions(-)
>>
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index ca884e39a5ff..3dea037faa55 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -4630,12 +4630,16 @@ F2FS_FEATURE_FUNCS(readonly, RO);
>>   F2FS_FEATURE_FUNCS(device_alias, DEVICE_ALIAS);
>>   
>>   #ifdef CONFIG_BLK_DEV_ZONED
>> -static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,
>> -				    block_t blkaddr)
>> +static inline bool f2fs_zone_is_seq(struct f2fs_sb_info *sbi, int devi,
>> +							unsigned int zone)
>>   {
>> -	unsigned int zno = blkaddr / sbi->blocks_per_blkz;
>> +	return test_bit(zone, FDEV(devi).blkz_seq);
>> +}
>>   
>> -	return test_bit(zno, FDEV(devi).blkz_seq);
>> +static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,
>> +								block_t blkaddr)
>> +{
>> +	return f2fs_zone_is_seq(sbi, devi, blkaddr / sbi->blocks_per_blkz);
>>   }
>>   #endif
>>   
>> @@ -4711,9 +4715,13 @@ static inline bool f2fs_valid_pinned_area(struct f2fs_sb_info *sbi,
>>   					  block_t blkaddr)
>>   {
>>   	if (f2fs_sb_has_blkzoned(sbi)) {
>> +#ifdef CONFIG_BLK_DEV_ZONED
>>   		int devi = f2fs_target_device_index(sbi, blkaddr);
>>   
>> -		return !bdev_is_zoned(FDEV(devi).bdev);
>> +		return !f2fs_blkz_is_seq(sbi, devi, blkaddr);
>> +#else
>> +		return true;
>> +#endif
>>   	}
>>   	return true;
>>   }
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index 396ef71f41e3..dc360b4b0569 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -3311,7 +3311,7 @@ int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi)
>>   
>>   	if (f2fs_sb_has_blkzoned(sbi) && err == -EAGAIN && gc_required) {
>>   		f2fs_down_write(&sbi->gc_lock);
>> -		err = f2fs_gc_range(sbi, 0, GET_SEGNO(sbi, FDEV(0).end_blk),
>> +		err = f2fs_gc_range(sbi, 0, sbi->first_zoned_segno - 1,
>>   				true, ZONED_PIN_SEC_REQUIRED_COUNT);
>>   		f2fs_up_write(&sbi->gc_lock);
>>   
>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>> index 011925ee54f8..9a42a1323f42 100644
>> --- a/fs/f2fs/super.c
>> +++ b/fs/f2fs/super.c
>> @@ -4307,12 +4307,33 @@ static void f2fs_record_error_work(struct work_struct *work)
>>   
>>   static inline unsigned int get_first_zoned_segno(struct f2fs_sb_info *sbi)
>>   {
>> +#ifdef CONFIG_BLK_DEV_ZONED
>> +	unsigned int zoneno, total_zones;
>>   	int devi;
>>   
>> -	for (devi = 0; devi < sbi->s_ndevs; devi++)
>> -		if (bdev_is_zoned(FDEV(devi).bdev))
>> -			return GET_SEGNO(sbi, FDEV(devi).start_blk);
>> -	return 0;
>> +	if (!f2fs_sb_has_blkzoned(sbi))
>> +		return NULL_SEGNO;
>> +
>> +	for (devi = 0; devi < sbi->s_ndevs; devi++) {
>> +		if (!bdev_is_zoned(FDEV(devi).bdev))
>> +			continue;
>> +
>> +		total_zones = GET_ZONE_FROM_SEG(sbi, FDEV(devi).total_segments);
>> +
>> +		for (zoneno = 0; zoneno < total_zones; zoneno++) {
>> +			unsigned int segs, blks;
>> +
>> +			if (!f2fs_zone_is_seq(sbi, devi, zoneno))
>> +				continue;
>> +
>> +			segs = GET_SEG_FROM_SEC(sbi,
>> +					zoneno * sbi->secs_per_zone);
>> +			blks = SEGS_TO_BLKS(sbi, segs);
>> +			return GET_SEGNO(sbi, FDEV(devi).start_blk + blks);
>> +		}
>> +	}
>> +#endif
>> +	return NULL_SEGNO;
>>   }
>>   
>>   static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
>> @@ -4349,6 +4370,14 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
>>   #endif
>>   
>>   	for (i = 0; i < max_devices; i++) {
>> +		if (max_devices == 1) {
>> +			FDEV(i).total_segments =
>> +				le32_to_cpu(raw_super->segment_count_main);
>> +			FDEV(i).start_blk = 0;
>> +			FDEV(i).end_blk = FDEV(i).total_segments *
>> +						BLKS_PER_SEG(sbi);
>> +		}
>> +
>>   		if (i == 0)
>>   			FDEV(0).bdev_file = sbi->sb->s_bdev_file;
>>   		else if (!RDEV(i).path[0])
>> -- 
>> 2.48.1