linux-kernel - Re: [PATCH 4/7] zonefs: use bdev_zone_no helper to calculate the zone index

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Date:   Fri, 6 Jan 2023 20:05:22 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Pankaj Raghav <p.raghav@...sung.com>, axboe@...nel.dk
Cc:     kernel@...kajraghav.com, linux-kernel@...r.kernel.org,
        hare@...e.de, bvanassche@....org, snitzer@...nel.org,
        dm-devel@...hat.com, linux-nvme@...ts.infradead.org, hch@....de,
        linux-block@...r.kernel.org, gost.dev@...sung.com
Subject: Re: [PATCH 4/7] zonefs: use bdev_zone_no helper to calculate the zone
 index

On 1/6/23 17:33, Pankaj Raghav wrote:
> Use bdev_zone_no() helper instead of opencoding the logic to find the
> zone index.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> ---
>  fs/zonefs/super.c  | 8 +++-----
>  fs/zonefs/zonefs.h | 1 -
>  2 files changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
> index 2c53fbb8d918..c2ddc62e99dc 100644
> --- a/fs/zonefs/super.c
> +++ b/fs/zonefs/super.c
> @@ -487,7 +487,6 @@ static void __zonefs_io_error(struct inode *inode, bool write)
>  {
>  	struct zonefs_inode_info *zi = ZONEFS_I(inode);
>  	struct super_block *sb = inode->i_sb;
> -	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
>  	unsigned int noio_flag;
>  	unsigned int nr_zones = 1;
>  	struct zonefs_ioerr_data err = {
> @@ -502,8 +501,8 @@ static void __zonefs_io_error(struct inode *inode, bool write)
>  	 * size is always larger than the device zone size.
>  	 */
>  	if (zi->i_zone_size > bdev_zone_sectors(sb->s_bdev))
> -		nr_zones = zi->i_zone_size >>
> -			(sbi->s_zone_sectors_shift + SECTOR_SHIFT);
> +		nr_zones =
> +			bdev_zone_no(sb->s_bdev, zi->i_zone_size >> SECTOR_SHIFT);

This is a number of zones, not a zone number. So this at least needs a
comment to make clear. Otherwise, I find this confusing.

I would also prefer you hold on this patch. I am about to post a big
series reworking many things in zonefs. That will conflict.

>  
>  	/*
>  	 * Memory allocations in blkdev_report_zones() can trigger a memory
> @@ -1420,7 +1419,7 @@ static int zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone,
>  	struct zonefs_inode_info *zi = ZONEFS_I(inode);
>  	int ret = 0;
>  
> -	inode->i_ino = zone->start >> sbi->s_zone_sectors_shift;
> +	inode->i_ino = bdev_zone_no(sb->s_bdev, zone->start);
>  	inode->i_mode = S_IFREG | sbi->s_perm;
>  
>  	zi->i_ztype = type;
> @@ -1804,7 +1803,6 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent)
>  	 * interface constraints.
>  	 */
>  	sb_set_blocksize(sb, bdev_zone_write_granularity(sb->s_bdev));
> -	sbi->s_zone_sectors_shift = ilog2(bdev_zone_sectors(sb->s_bdev));
>  	sbi->s_uid = GLOBAL_ROOT_UID;
>  	sbi->s_gid = GLOBAL_ROOT_GID;
>  	sbi->s_perm = 0640;
> diff --git a/fs/zonefs/zonefs.h b/fs/zonefs/zonefs.h
> index 1dbe78119ff1..703bc4505b29 100644
> --- a/fs/zonefs/zonefs.h
> +++ b/fs/zonefs/zonefs.h
> @@ -179,7 +179,6 @@ struct zonefs_sb_info {
>  	kgid_t			s_gid;
>  	umode_t			s_perm;
>  	uuid_t			s_uuid;
> -	unsigned int		s_zone_sectors_shift;
>  
>  	unsigned int		s_nr_files[ZONEFS_ZTYPE_MAX];
>  

-- 
Damien Le Moal
Western Digital Research