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From: Eric Biggers <ebiggers@kernel.org>
To: Jan Kara <jack@suse.cz>
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 08/13] ext4: simplify i_state checks in __ext4_update_other_inode_time()
Date: Thu, 7 Jan 2021 11:06:51 -0800
Message-ID: <X/dbyxqr9iyf7ZbO@gmail.com> (raw)
In-Reply-To: <20210107132412.GE12990@quack2.suse.cz>

On Thu, Jan 07, 2021 at 02:24:12PM +0100, Jan Kara wrote:
> On Mon 04-01-21 16:54:47, Eric Biggers wrote:
> > From: Eric Biggers <ebiggers@google.com>
> > 
> > Since I_DIRTY_TIME and I_DIRTY_INODE are mutually exclusive in i_state,
> > there's no need to check for I_DIRTY_TIME && !I_DIRTY_INODE.  Just check
> > for I_DIRTY_TIME.
> > 
> > Signed-off-by: Eric Biggers <ebiggers@google.com>
> > ---
> >  fs/ext4/inode.c | 8 +++-----
> >  1 file changed, 3 insertions(+), 5 deletions(-)
> > 
> > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> > index 4cc6c7834312f..9e34541715968 100644
> > --- a/fs/ext4/inode.c
> > +++ b/fs/ext4/inode.c
> > @@ -4962,14 +4962,12 @@ static void __ext4_update_other_inode_time(struct super_block *sb,
> >  		return;
> >  
> >  	if ((inode->i_state & (I_FREEING | I_WILL_FREE | I_NEW |
> > -			       I_DIRTY_INODE)) ||
> > -	    ((inode->i_state & I_DIRTY_TIME) == 0))
> > +			       I_DIRTY_TIME)) != I_DIRTY_TIME)
> >  		return;
> 
> This is OK.
> 
> >  	spin_lock(&inode->i_lock);
> > -	if (((inode->i_state & (I_FREEING | I_WILL_FREE | I_NEW |
> > -				I_DIRTY_INODE)) == 0) &&
> > -	    (inode->i_state & I_DIRTY_TIME)) {
> > +	if ((inode->i_state & (I_FREEING | I_WILL_FREE | I_NEW |
> > +			       I_DIRTY_TIME)) != I_DIRTY_TIME) {
> 
> But this condition is negated AFAICT. We should have == I_DIRTY_TIME here
> AFAICT.

Indeed, I'll fix that.  Thanks for catching this!

- Eric

  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
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 [this message]
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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