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

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Message-ID: <Z-YXqKOIgYCpfuL0@google.com>
Date: Fri, 28 Mar 2025 03:29:44 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: 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

It seems this patch breaks the multi-partition cases.

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