linux-ext4 - Re: [RFC 3/3] fs/buffer: Make submit_bh & submit_bh

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Date:   Mon, 20 Jun 2022 11:41:46 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ritesh Harjani <ritesh.list@...il.com>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Jan Kara <jack@...e.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC 3/3] fs/buffer: Make submit_bh & submit_bh_wbc return type
 as void

On Mon 20-06-22 11:28:42, Ritesh Harjani wrote:
> submit_bh/submit_bh_wbc are non-blocking functions which just submits
> the bio and returns. The caller of submit_bh/submit_bh_wbc needs to wait
> on buffer till I/O completion and then check buffer head's b_state field
> to know if there was any I/O error.
> 
> Hence there is no need for these functions to have any return type.
> Even now they always returns 0. Hence drop the return value and make
> their return type as void to avoid any confusion.
> 
> Signed-off-by: Ritesh Harjani <ritesh.list@...il.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/buffer.c                 | 9 ++++-----
>  include/linux/buffer_head.h | 2 +-
>  2 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 313283af15b6..6671abc98e21 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -52,7 +52,7 @@
>  #include "internal.h"
>  
>  static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
> -static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
> +static void submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
>  			 struct writeback_control *wbc);
>  
>  #define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)
> @@ -2994,7 +2994,7 @@ static void end_bio_bh_io_sync(struct bio *bio)
>  	bio_put(bio);
>  }
>  
> -static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
> +static void submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
>  			 struct writeback_control *wbc)
>  {
>  	struct bio *bio;
> @@ -3037,12 +3037,11 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
>  	}
>  
>  	submit_bio(bio);
> -	return 0;
>  }
>  
> -int submit_bh(int op, int op_flags, struct buffer_head *bh)
> +void submit_bh(int op, int op_flags, struct buffer_head *bh)
>  {
> -	return submit_bh_wbc(op, op_flags, bh, NULL);
> +	submit_bh_wbc(op, op_flags, bh, NULL);
>  }
>  EXPORT_SYMBOL(submit_bh);
>  
> diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
> index c9d1463bb20f..392d7d5aec05 100644
> --- a/include/linux/buffer_head.h
> +++ b/include/linux/buffer_head.h
> @@ -205,7 +205,7 @@ void ll_rw_block(int, int, int, struct buffer_head * bh[]);
>  int sync_dirty_buffer(struct buffer_head *bh);
>  int __sync_dirty_buffer(struct buffer_head *bh, int op_flags);
>  void write_dirty_buffer(struct buffer_head *bh, int op_flags);
> -int submit_bh(int, int, struct buffer_head *);
> +void submit_bh(int op, int op_flags, struct buffer_head *bh);
>  void write_boundary_block(struct block_device *bdev,
>  			sector_t bblock, unsigned blocksize);
>  int bh_uptodate_or_lock(struct buffer_head *bh);
> -- 
> 2.35.3
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR