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From: Jan Kara <jack@suse.cz>
To: Eric Biggers <ebiggers@kernel.org>
Cc: 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>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 05/13] fs: don't call ->dirty_inode for lazytime timestamp updates
Date: Thu, 7 Jan 2021 14:18:53 +0100
Message-ID: <20210107131853.GA10535@quack2.suse.cz> (raw)
In-Reply-To: <20210107131753.GD12990@quack2.suse.cz>

On Thu 07-01-21 14:17:53, Jan Kara wrote:
> On Mon 04-01-21 16:54:44, Eric Biggers wrote:
> > From: Eric Biggers <ebiggers@google.com>
> > 
> > There is no need to call ->dirty_inode for lazytime timestamp updates
> > (i.e. for __mark_inode_dirty(I_DIRTY_TIME)), since by the definition of
> > lazytime, filesystems must ignore these updates.  Filesystems only need
> > to care about the updated timestamps when they expire.
> > 
> > Therefore, only call ->dirty_inode when I_DIRTY_INODE is set.
> > 
> > Based on a patch from Christoph Hellwig:
> > https://lore.kernel.org/r/20200325122825.1086872-4-hch@lst.de
> > 
> > Signed-off-by: Eric Biggers <ebiggers@google.com>
> 
> ...
> 
> > diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> > index 081e335cdee47..e3347fd6eb13a 100644
> > --- a/fs/fs-writeback.c
> > +++ b/fs/fs-writeback.c
> > @@ -2264,16 +2264,16 @@ void __mark_inode_dirty(struct inode *inode, int flags)
> >  	 * Don't do this for I_DIRTY_PAGES - that doesn't actually
> >  	 * dirty the inode itself
> >  	 */
> > -	if (flags & (I_DIRTY_INODE | I_DIRTY_TIME)) {
> > +	if (flags & I_DIRTY_INODE) {
> >  		trace_writeback_dirty_inode_start(inode, flags);
> >  
> >  		if (sb->s_op->dirty_inode)
> >  			sb->s_op->dirty_inode(inode, flags);
> 
> OK, but shouldn't we pass just (flags & I_DIRTY_INODE) to ->dirty_inode().
> Just to make it clear what the filesystem is supposed to consume in
> 'flags'...

Aha, you just did that in the following patch ;) So taking back my comment.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

  reply index

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
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 [this message]
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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