linux-kernel - Re: [RFC PATCH 28/34] zonefs: use bio

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Date:   Thu, 28 Jan 2021 07:25:08 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
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Subject: Re: [RFC PATCH 28/34] zonefs: use bio_new

On 2021/01/28 16:15, Chaitanya Kulkarni wrote:
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
> ---
>  fs/zonefs/super.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
> index ab68e27bb322..620d67965a22 100644
> --- a/fs/zonefs/super.c
> +++ b/fs/zonefs/super.c
> @@ -661,6 +661,7 @@ static const struct iomap_dio_ops zonefs_write_dio_ops = {
>  
>  static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
>  {
> +	unsigned int op = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;

I do not see the point of adding this variable since it is used only for the
bio_new() call. Pass the op value directly.

>  	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;
> @@ -678,15 +679,12 @@ static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
>  	if (!nr_pages)
>  		return 0;
>  
> -	bio = bio_alloc(GFP_NOFS, nr_pages);
> +	bio = bio_new(bdev, zi->i_zsector, op, 0, GFP_NOFS, nr_pages);
>  	if (!bio)
>  		return -ENOMEM;
>  
> -	bio_set_dev(bio, bdev);
> -	bio->bi_iter.bi_sector = zi->i_zsector;
>  	bio->bi_write_hint = iocb->ki_hint;
>  	bio->bi_ioprio = iocb->ki_ioprio;
> -	bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
>  	if (iocb->ki_flags & IOCB_DSYNC)
>  		bio->bi_opf |= REQ_FUA;
>  
> 


-- 
Damien Le Moal
Western Digital Research