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Subject: Re: [PATCH] ext4: remove unused parameter biop in
 ext4_issue_discard()
To: Wenchao Hao <haowenchao2@huawei.com>, Theodore Ts'o <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>, <linux-ext4@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
CC: <louhongxiang@huawei.com>
References: <20240226081731.3224470-1-haowenchao2@huawei.com>
From: Zhang Yi <yi.zhang@huawei.com>
Message-ID: <71d17598-c39b-9e11-03f0-cb344a24d8a5@huawei.com>
Date: Mon, 26 Feb 2024 22:06:15 +0800
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On 2024/2/26 16:17, Wenchao Hao wrote:
> all caller of ext4_issue_discard() would set biop to NULL since
> 'commit 55cdd0af2bc5 ("ext4: get discard out of jbd2 commit kthread
> contex")', it's unnecessary to keep this parameter any more.
> 
> Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>

Thanks for the patch, it looks good to me.

Reviewed-by: Zhang Yi <yi.zhang@huawei.com>

> ---
>  fs/ext4/mballoc.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index d72b5e3c92ec..1590ee3f4603 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -3807,8 +3807,7 @@ int ext4_mb_release(struct super_block *sb)
>  }
>  
>  static inline int ext4_issue_discard(struct super_block *sb,
> -		ext4_group_t block_group, ext4_grpblk_t cluster, int count,
> -		struct bio **biop)
> +		ext4_group_t block_group, ext4_grpblk_t cluster, int count)
>  {
>  	ext4_fsblk_t discard_block;
>  
> @@ -3817,13 +3816,8 @@ static inline int ext4_issue_discard(struct super_block *sb,
>  	count = EXT4_C2B(EXT4_SB(sb), count);
>  	trace_ext4_discard_blocks(sb,
>  			(unsigned long long) discard_block, count);
> -	if (biop) {
> -		return __blkdev_issue_discard(sb->s_bdev,
> -			(sector_t)discard_block << (sb->s_blocksize_bits - 9),
> -			(sector_t)count << (sb->s_blocksize_bits - 9),
> -			GFP_NOFS, biop);
> -	} else
> -		return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0);
> +
> +	return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0);
>  }
>  
>  static void ext4_free_data_in_buddy(struct super_block *sb,
> @@ -6475,7 +6469,7 @@ static void ext4_mb_clear_bb(handle_t *handle, struct inode *inode,
>  	} else {
>  		if (test_opt(sb, DISCARD)) {
>  			err = ext4_issue_discard(sb, block_group, bit,
> -						 count_clusters, NULL);
> +						 count_clusters);
>  			if (err && err != -EOPNOTSUPP)
>  				ext4_msg(sb, KERN_WARNING, "discard request in"
>  					 " group:%u block:%d count:%lu failed"
> @@ -6726,7 +6720,7 @@ __acquires(bitlock)
>  	 */
>  	mb_mark_used(e4b, &ex);
>  	ext4_unlock_group(sb, group);
> -	ret = ext4_issue_discard(sb, group, start, count, NULL);
> +	ret = ext4_issue_discard(sb, group, start, count);
>  	ext4_lock_group(sb, group);
>  	mb_free_blocks(NULL, e4b, start, ex.fe_len);
>  	return ret;
>