Re: [PATCH 14/27] block: add a bdev_max_zone_append_sectors helper

[Damien Le Moal <damien.lemoal@opensource.wdc.com>]

On 4/6/22 15:05, Christoph Hellwig wrote:
> Add a helper to check the max supported sectors for zone append based on
> the block_device instead of having to poke into the block layer internal
> request_queue.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   drivers/nvme/target/zns.c | 3 +--
>   fs/zonefs/super.c         | 3 +--
>   include/linux/blkdev.h    | 6 ++++++
>   3 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
> index e34718b095504..82b61acf7a72b 100644
> --- a/drivers/nvme/target/zns.c
> +++ b/drivers/nvme/target/zns.c
> @@ -34,8 +34,7 @@ static int validate_conv_zones_cb(struct blk_zone *z,
>   
>   bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
>   {
> -	struct request_queue *q = ns->bdev->bd_disk->queue;
> -	u8 zasl = nvmet_zasl(queue_max_zone_append_sectors(q));
> +	u8 zasl = nvmet_zasl(bdev_max_zone_append_sectors(ns->bdev));
>   	struct gendisk *bd_disk = ns->bdev->bd_disk;
>   	int ret;
>   
> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
> index 3614c7834007d..7a63807b736c4 100644
> --- a/fs/zonefs/super.c
> +++ b/fs/zonefs/super.c
> @@ -678,13 +678,12 @@ static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
>   	struct inode *inode = file_inode(iocb->ki_filp);
>   	struct zonefs_inode_info *zi = ZONEFS_I(inode);
>   	struct block_device *bdev = inode->i_sb->s_bdev;
> -	unsigned int max;
> +	unsigned int max = bdev_max_zone_append_sectors(bdev);
>   	struct bio *bio;
>   	ssize_t size;
>   	int nr_pages;
>   	ssize_t ret;
>   
> -	max = queue_max_zone_append_sectors(bdev_get_queue(bdev));
>   	max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize);
>   	iov_iter_truncate(from, max);
>   
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index a433798c3343e..f8c50b77543eb 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1188,6 +1188,12 @@ static inline unsigned int queue_max_zone_append_sectors(const struct request_qu
>   	return min(l->max_zone_append_sectors, l->max_sectors);
>   }
>   
> +static inline unsigned int
> +bdev_max_zone_append_sectors(struct block_device *bdev)
> +{
> +	return queue_max_zone_append_sectors(bdev_get_queue(bdev));
> +}
> +
>   static inline unsigned queue_logical_block_size(const struct request_queue *q)
>   {
>   	int retval = 512;

Looks good.

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

-- 
Damien Le Moal
Western Digital Research