linux-ext4 - Re: [PATCH 01/13] fs: avoid double-writing inodes on lazytime expiration

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Date:   Fri, 8 Jan 2021 10:01:33 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jan Kara <jack@...e.cz>
Cc:     Eric Biggers <ebiggers@...nel.org>, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-xfs@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Christoph Hellwig <hch@....de>, stable@...r.kernel.org
Subject: Re: [PATCH 01/13] fs: avoid double-writing inodes on lazytime
 expiration

> +	/*
> +	 * If inode has dirty timestamps and we need to write them, call
> +	 * mark_inode_dirty_sync() to notify filesystem about it.
> +	 */
> +	if (inode->i_state & I_DIRTY_TIME &&
> +	    (wbc->for_sync || wbc->sync_mode == WB_SYNC_ALL ||
> +	     time_after(jiffies, inode->dirtied_time_when +
> +			dirtytime_expire_interval * HZ))) {

If we're touching this area, it would be nice to split this condition
into a readable helper ala:

static inline bool inode_needs_timestamp_sync(struct writeback_control *wbc,
		struct inode *inode)
{
	if (!(inode->i_state & I_DIRTY_TIME))
		return false;
	if (wbc->for_sync || wbc->sync_mode == WB_SYNC_ALL)
		return true;
	return time_after(jiffies, inode->dirtied_time_when +
			  dirtytime_expire_interval * HZ);
}