linux-kernel - Re: [PATCH] f2fs: apply zone capacity to all zone type

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Date:   Tue, 21 Mar 2023 16:35:29 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH] f2fs: apply zone capacity to all zone type

On 03/21, Jaegeuk Kim wrote:
> If we manage the zone capacity per zone type, it'll break the GC assumption.
> And, the current logic complains valid block count mismatch.
> Let's apply zone capacity to all zone type, if specified.
> 

Added:

Fixes: de881df97768 ("f2fs: support zone capacity less than zone size")

> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/segment.c | 65 +++--------------------------------------------
>  fs/f2fs/segment.h |  3 +++
>  2 files changed, 7 insertions(+), 61 deletions(-)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 055e70e77aa2..6c11789da884 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -4999,48 +4999,6 @@ int f2fs_check_write_pointer(struct f2fs_sb_info *sbi)
>  	return 0;
>  }
>  
> -static bool is_conv_zone(struct f2fs_sb_info *sbi, unsigned int zone_idx,
> -						unsigned int dev_idx)
> -{
> -	if (!bdev_is_zoned(FDEV(dev_idx).bdev))
> -		return true;
> -	return !test_bit(zone_idx, FDEV(dev_idx).blkz_seq);
> -}
> -
> -/* Return the zone index in the given device */
> -static unsigned int get_zone_idx(struct f2fs_sb_info *sbi, unsigned int secno,
> -					int dev_idx)
> -{
> -	block_t sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, secno));
> -
> -	return (sec_start_blkaddr - FDEV(dev_idx).start_blk) >>
> -						sbi->log_blocks_per_blkz;
> -}
> -
> -/*
> - * Return the usable segments in a section based on the zone's
> - * corresponding zone capacity. Zone is equal to a section.
> - */
> -static inline unsigned int f2fs_usable_zone_segs_in_sec(
> -		struct f2fs_sb_info *sbi, unsigned int segno)
> -{
> -	unsigned int dev_idx, zone_idx;
> -
> -	dev_idx = f2fs_target_device_index(sbi, START_BLOCK(sbi, segno));
> -	zone_idx = get_zone_idx(sbi, GET_SEC_FROM_SEG(sbi, segno), dev_idx);
> -
> -	/* Conventional zone's capacity is always equal to zone size */
> -	if (is_conv_zone(sbi, zone_idx, dev_idx))
> -		return sbi->segs_per_sec;
> -
> -	if (!sbi->unusable_blocks_per_sec)
> -		return sbi->segs_per_sec;
> -
> -	/* Get the segment count beyond zone capacity block */
> -	return sbi->segs_per_sec - (sbi->unusable_blocks_per_sec >>
> -						sbi->log_blocks_per_seg);
> -}
> -
>  /*
>   * Return the number of usable blocks in a segment. The number of blocks
>   * returned is always equal to the number of blocks in a segment for
> @@ -5053,23 +5011,13 @@ static inline unsigned int f2fs_usable_zone_blks_in_seg(
>  			struct f2fs_sb_info *sbi, unsigned int segno)
>  {
>  	block_t seg_start, sec_start_blkaddr, sec_cap_blkaddr;
> -	unsigned int zone_idx, dev_idx, secno;
> -
> -	secno = GET_SEC_FROM_SEG(sbi, segno);
> -	seg_start = START_BLOCK(sbi, segno);
> -	dev_idx = f2fs_target_device_index(sbi, seg_start);
> -	zone_idx = get_zone_idx(sbi, secno, dev_idx);
> -
> -	/*
> -	 * Conventional zone's capacity is always equal to zone size,
> -	 * so, blocks per segment is unchanged.
> -	 */
> -	if (is_conv_zone(sbi, zone_idx, dev_idx))
> -		return sbi->blocks_per_seg;
> +	unsigned int secno;
>  
>  	if (!sbi->unusable_blocks_per_sec)
>  		return sbi->blocks_per_seg;
>  
> +	secno = GET_SEC_FROM_SEG(sbi, segno);
> +	seg_start = START_BLOCK(sbi, segno);
>  	sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, secno));
>  	sec_cap_blkaddr = sec_start_blkaddr + CAP_BLKS_PER_SEC(sbi);
>  
> @@ -5103,11 +5051,6 @@ static inline unsigned int f2fs_usable_zone_blks_in_seg(struct f2fs_sb_info *sbi
>  	return 0;
>  }
>  
> -static inline unsigned int f2fs_usable_zone_segs_in_sec(struct f2fs_sb_info *sbi,
> -							unsigned int segno)
> -{
> -	return 0;
> -}
>  #endif
>  unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
>  					unsigned int segno)
> @@ -5122,7 +5065,7 @@ unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
>  					unsigned int segno)
>  {
>  	if (f2fs_sb_has_blkzoned(sbi))
> -		return f2fs_usable_zone_segs_in_sec(sbi, segno);
> +		return CAP_SEGS_PER_SEC(sbi);
>  
>  	return sbi->segs_per_sec;
>  }
> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> index efdb7fc3b797..babb29a1c034 100644
> --- a/fs/f2fs/segment.h
> +++ b/fs/f2fs/segment.h
> @@ -104,6 +104,9 @@ static inline void sanity_check_seg_type(struct f2fs_sb_info *sbi,
>  #define CAP_BLKS_PER_SEC(sbi)					\
>  	((sbi)->segs_per_sec * (sbi)->blocks_per_seg -		\
>  	 (sbi)->unusable_blocks_per_sec)
> +#define CAP_SEGS_PER_SEC(sbi)					\
> +	((sbi)->segs_per_sec - ((sbi)->unusable_blocks_per_sec >>\
> +	(sbi)->log_blocks_per_seg))
>  #define GET_SEC_FROM_SEG(sbi, segno)				\
>  	(((segno) == -1) ? -1: (segno) / (sbi)->segs_per_sec)
>  #define GET_SEG_FROM_SEC(sbi, secno)				\
> -- 
> 2.40.0.rc1.284.g88254d51c5-goog