linux-kernel - Re: [RFC PATCH v4 5/8] xfs: refactor the truncating order

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Message-ID: <ZlnRODP_b8bhXOEE@infradead.org>
Date: Fri, 31 May 2024 06:31:36 -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 5/8] xfs: refactor the truncating order

> +	write_back = newsize > ip->i_disk_size && oldsize != ip->i_disk_size;

Maybe need_writeback would be a better name for the variable?  Also no
need to initialize it to false at declaration time if it is
unconditionally set here.

> +		/*
> +		 * Updating i_size after writing back to make sure the zeroed
> +		 * blocks could been written out, and drop all the page cache
> +		 * range that beyond blocksize aligned new EOF block.
> +		 *
> +		 * We've already locked out new page faults, so now we can
> +		 * safely remove pages from the page cache knowing they won't
> +		 * get refaulted until we drop the XFS_MMAP_EXCL lock after the
> +		 * extent manipulations are complete.
> +		 */
> +		i_size_write(inode, newsize);
> +		truncate_pagecache(inode, roundup_64(newsize, blocksize));

Any reason this open codes truncate_setsize()?