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From: Eric Biggers <ebiggers@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>,
	linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-xfs@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>,
	stable@vger.kernel.org
Subject: Re: [PATCH 01/13] fs: avoid double-writing inodes on lazytime expiration
Date: Sat, 9 Jan 2021 09:11:31 -0800	[thread overview]
Message-ID: <X/njw9b+qqK3vlMs@sol.localdomain> (raw)
In-Reply-To: <20210108090133.GD1438@lst.de>

On Fri, Jan 08, 2021 at 10:01:33AM +0100, Christoph Hellwig wrote:
> > +	/*
> > +	 * 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);
> }

I didn't end up doing this since it would only be called once, and IMO it's more
readable to keep it inlined next to the comment that explains what's going on.
Especially considering the later patch that drops the check for wbc->for_sync.

-  Eric

  reply	other threads:[~2021-01-09 17:12 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-05  0:54 [PATCH 00/13] lazytime fixes and cleanups Eric Biggers
2021-01-05  0:54 ` [PATCH 01/13] fs: avoid double-writing inodes on lazytime expiration Eric Biggers
2021-01-07 14:47   ` Jan Kara
2021-01-07 14:58     ` Matthew Wilcox
2021-01-07 21:46     ` Eric Biggers
2021-01-08  8:54       ` Christoph Hellwig
2021-01-08  9:01     ` Christoph Hellwig
2021-01-09 17:11       ` Eric Biggers [this message]
2021-01-05  0:54 ` [PATCH 02/13] gfs2: don't worry about I_DIRTY_TIME in gfs2_fsync() Eric Biggers
2021-01-08  8:54   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 03/13] fs: only specify I_DIRTY_TIME when needed in generic_update_time() Eric Biggers
2021-01-08  8:57   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 04/13] fat: only specify I_DIRTY_TIME when needed in fat_update_time() Eric Biggers
2021-01-07 13:13   ` Jan Kara
2021-01-07 19:10     ` Eric Biggers
2021-01-05  0:54 ` [PATCH 05/13] fs: don't call ->dirty_inode for lazytime timestamp updates Eric Biggers
2021-01-07 13:17   ` Jan Kara
2021-01-07 13:18     ` Jan Kara
2021-01-08  9:02   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 06/13] fs: pass only I_DIRTY_INODE flags to ->dirty_inode Eric Biggers
2021-01-08  9:02   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 07/13] fs: correctly document the inode dirty flags Eric Biggers
2021-01-08  9:03   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 08/13] ext4: simplify i_state checks in __ext4_update_other_inode_time() Eric Biggers
2021-01-07 13:24   ` Jan Kara
2021-01-07 19:06     ` Eric Biggers
2021-01-05  0:54 ` [PATCH 09/13] fs: drop redundant checks from __writeback_single_inode() Eric Biggers
2021-01-08  9:12   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 10/13] fs: clean up __mark_inode_dirty() a bit Eric Biggers
2021-01-08  9:10   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 11/13] fs: add a lazytime_expired method Eric Biggers
2021-01-07 14:02   ` Jan Kara
2021-01-07 22:05     ` Eric Biggers
2021-01-08  9:14       ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 12/13] xfs: remove a stale comment from xfs_file_aio_write_checks() Eric Biggers
2021-01-08  9:15   ` Christoph Hellwig
2021-01-05  0:54 ` [PATCH 13/13] xfs: implement lazytime_expired Eric Biggers

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