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

Damien Le Moal
2023-01-06T11:05:36Z

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@samsung.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