linux-kernel - Re: [RFC PATCH v4 3/8] iomap: pass blocksize to iomap_truncate

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Date: Fri, 31 May 2024 05:39:10 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, djwong@...nel.org, hch@...radead.org,
	brauner@...nel.org, david@...morbit.com, chandanbabu@...nel.org,
	jack@...e.cz, willy@...radead.org, yi.zhang@...wei.com,
	chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: Re: [RFC PATCH v4 3/8] iomap: pass blocksize to iomap_truncate_page()

> -		const struct iomap_ops *ops)
> +iomap_truncate_page(struct inode *inode, loff_t pos, unsigned int blocksize,
> +		bool *did_zero, const struct iomap_ops *ops)
>  {
> -	unsigned int blocksize = i_blocksize(inode);
> -	unsigned int off = pos & (blocksize - 1);
> +	unsigned int off = rem_u64(pos, blocksize);
>  
>  	/* Block boundary? Nothing to do */
>  	if (!off)

Instad of passing yet another argument here, can we just kill
iomap_truncate_page?

I.e. just open code the rem_u64 and 0 offset check in the only caller
and call iomap_zero_range.  Same for the DAX variant and it's two
callers.