linux-kernel - Re: [PATCH v8 06/11] zonefs: allow non power of 2 zoned devices

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Message-ID: <cf96b0e4-dbb1-350b-602b-a72682fca2fb@opensource.wdc.com>
Date:   Thu, 28 Jul 2022 12:16:12 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Pankaj Raghav <p.raghav@...sung.com>, hch@....de, axboe@...nel.dk,
        snitzer@...nel.org, Johannes.Thumshirn@....com
Cc:     matias.bjorling@....com, gost.dev@...sung.com,
        linux-kernel@...r.kernel.org, hare@...e.de,
        linux-block@...r.kernel.org, pankydev8@...il.com,
        bvanassche@....org, jaegeuk@...nel.org, dm-devel@...hat.com,
        linux-nvme@...ts.infradead.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH v8 06/11] zonefs: allow non power of 2 zoned devices

On 7/28/22 01:22, Pankaj Raghav wrote:
> The zone size shift variable is useful only if the zone sizes are known
> to be power of 2. Remove that variable and use generic helpers from
> block layer to calculate zone index in zonefs.
> 
> Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>

Acked-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

> ---
>  fs/zonefs/super.c  | 6 ++----
>  fs/zonefs/zonefs.h | 1 -
>  2 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
> index 860f0b1032c6..e549ef16738c 100644
> --- a/fs/zonefs/super.c
> +++ b/fs/zonefs/super.c
> @@ -476,10 +476,9 @@ 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 =
> -		zi->i_zone_size >> (sbi->s_zone_sectors_shift + SECTOR_SHIFT);
> +		bdev_zone_no(sb->s_bdev, zi->i_zone_size >> SECTOR_SHIFT);
>  	struct zonefs_ioerr_data err = {
>  		.inode = inode,
>  		.write = write,
> @@ -1401,7 +1400,7 @@ 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;
> @@ -1776,7 +1775,6 @@ 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 4b3de66c3233..39895195cda6 100644
> --- a/fs/zonefs/zonefs.h
> +++ b/fs/zonefs/zonefs.h
> @@ -177,7 +177,6 @@ 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