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From: Christoph Hellwig <hch@infradead.org>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Ext4 Developers List <linux-ext4@vger.kernel.org>,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-xfs@vger.kernel.org, Eric Biggers <ebiggers@kernel.org>,
	Richard Weinberger <richard@nod.at>
Subject: Re: [PATCH 1/2] writeback: avoid double-writing the inode on a lazytime expiration
Date: Wed, 25 Mar 2020 02:20:57 -0700	[thread overview]
Message-ID: <20200325092057.GA25483@infradead.org> (raw)
In-Reply-To: <20200320025255.1705972-1-tytso@mit.edu>

>  	spin_unlock(&inode->i_lock);
>  
> -	if (dirty & I_DIRTY_TIME)
> -		mark_inode_dirty_sync(inode);
> +	/* This was a lazytime expiration; we need to tell the file system */
> +	if (dirty & I_DIRTY_TIME_EXPIRED && inode->i_sb->s_op->dirty_inode)
> +		inode->i_sb->s_op->dirty_inode(inode, I_DIRTY_SYNC);

I think this needs a very clear comment explaining why we don't go
through __mark_inode_dirty.

But as said before I'd rather have a new lazytime_expired operation that
makes it very clear what is happening.  We currenly have 4 file systems
(ext4, f2fs, ubifs and xfs) that support lazytime, so this won't really
be a major churn.

WARNING: multiple messages have this Message-ID
From: Christoph Hellwig <hch@infradead.org>
To: Theodore Ts'o <tytso@mit.edu>
Cc: linux-xfs@vger.kernel.org, Eric Biggers <ebiggers@kernel.org>,
	Ext4 Developers List <linux-ext4@vger.kernel.org>,
	Richard Weinberger <richard@nod.at>,
	linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 1/2] writeback: avoid double-writing the inode on a lazytime expiration
Date: Wed, 25 Mar 2020 02:20:57 -0700	[thread overview]
Message-ID: <20200325092057.GA25483@infradead.org> (raw)
In-Reply-To: <20200320025255.1705972-1-tytso@mit.edu>

>  	spin_unlock(&inode->i_lock);
>  
> -	if (dirty & I_DIRTY_TIME)
> -		mark_inode_dirty_sync(inode);
> +	/* This was a lazytime expiration; we need to tell the file system */
> +	if (dirty & I_DIRTY_TIME_EXPIRED && inode->i_sb->s_op->dirty_inode)
> +		inode->i_sb->s_op->dirty_inode(inode, I_DIRTY_SYNC);

I think this needs a very clear comment explaining why we don't go
through __mark_inode_dirty.

But as said before I'd rather have a new lazytime_expired operation that
makes it very clear what is happening.  We currenly have 4 file systems
(ext4, f2fs, ubifs and xfs) that support lazytime, so this won't really
be a major churn.


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  parent reply	other threads:[~2020-03-25  9:20 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06  0:45 lazytime causing inodes to remain dirty after sync? Eric Biggers
2020-03-06  0:45 ` [f2fs-dev] " Eric Biggers
2020-03-07  2:00 ` [PATCH] writeback: avoid double-writing the inode on a lazytime expiration Theodore Ts'o
2020-03-07  2:00   ` [f2fs-dev] " Theodore Ts'o
2020-03-11  3:20   ` Eric Biggers
2020-03-11  3:20     ` [f2fs-dev] " Eric Biggers
2020-03-11 12:57     ` Theodore Y. Ts'o
2020-03-11 12:57       ` [f2fs-dev] " Theodore Y. Ts'o
2020-03-12  0:07       ` Dave Chinner
2020-03-12  0:07         ` [f2fs-dev] " Dave Chinner
2020-03-12 14:34         ` Christoph Hellwig
2020-03-12 14:34           ` [f2fs-dev] " Christoph Hellwig
2020-03-12 22:39           ` Dave Chinner
2020-03-12 22:39             ` [f2fs-dev] " Dave Chinner
2020-03-20  2:46           ` Theodore Y. Ts'o
2020-03-20  2:46             ` [f2fs-dev] " Theodore Y. Ts'o
2020-03-20  2:52             ` [PATCH 1/2] " Theodore Ts'o
2020-03-20  2:52               ` [f2fs-dev] " Theodore Ts'o
2020-03-20  2:52               ` [PATCH 2/2] writeback, xfs: call dirty_inode() with I_DIRTY_TIME_EXPIRED when appropriate Theodore Ts'o
2020-03-20  2:52                 ` [f2fs-dev] " Theodore Ts'o
2020-03-23 17:58                 ` Theodore Y. Ts'o
2020-03-23 17:58                   ` [f2fs-dev] " Theodore Y. Ts'o
2020-03-24  8:37                   ` Christoph Hellwig
2020-03-24  8:37                     ` [f2fs-dev] " Christoph Hellwig
2020-03-24 18:43                     ` Theodore Y. Ts'o
2020-03-24 18:43                       ` [f2fs-dev] " Theodore Y. Ts'o
2020-03-25  9:20               ` Christoph Hellwig [this message]
2020-03-25  9:20                 ` [f2fs-dev] [PATCH 1/2] writeback: avoid double-writing the inode on a lazytime expiration Christoph Hellwig
2020-03-25 15:21                 ` Theodore Y. Ts'o
2020-03-25 15:21                   ` [f2fs-dev] " Theodore Y. Ts'o
2020-03-25 15:47                   ` Darrick J. Wong
2020-03-25 15:47                     ` [f2fs-dev] " Darrick J. Wong
2020-03-11 23:54     ` [PATCH] " Dave Chinner
2020-03-11 23:54       ` [f2fs-dev] " Dave Chinner

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