From: Jeff Layton <jlayton@redhat.com>
To: NeilBrown <neil@brown.name>, linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org,
linux-xfs@vger.kernel.org
Subject: Re: [RFC PATCH v1 29/30] fs: track whether the i_version has been queried with an i_state flag
Date: Fri, 03 Mar 2017 19:43:21 -0500 [thread overview]
Message-ID: <1488588201.11672.4.camel@redhat.com> (raw)
In-Reply-To: <87wpc5lxg6.fsf@notabene.neil.brown.name>
On Sat, 2017-03-04 at 11:03 +1100, NeilBrown wrote:
> On Wed, Dec 21 2016, Jeff Layton wrote:
>
> > @@ -2072,7 +2093,12 @@ inode_cmp_iversion(const struct inode *inode, const u64 old)
> > static inline bool
> > inode_iversion_need_inc(struct inode *inode)
> > {
> > - return true;
> > + bool ret;
> > +
> > + spin_lock(&inode->i_lock);
> > + ret = inode->i_state & I_VERS_BUMP;
> > + spin_unlock(&inode->i_lock);
> > + return ret;
> > }
> >
>
> I know this code gets removed, so this isn't really important.
> By why do you take the spinlock here? What are you racing again?
>
> Thanks,
> NeilBrown
I think I was worried about I_VERS_BUMP being set or cleared during an
increment or query. It is quite possible that that spinlock is not
necessary.
--
Jeff Layton <jlayton@redhat.com>
next prev parent reply other threads:[~2017-03-04 0:52 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-21 17:03 [RFC PATCH v1 00/30] fs: inode->i_version rework and optimization Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 01/30] lustre: don't set f_version in ll_readdir Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 02/30] ecryptfs: remove unnecessary i_version bump Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 03/30] ceph: remove the bump of i_version Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 04/30] f2fs: don't bother setting i_version Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 05/30] hpfs: don't bother with the i_version counter Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 06/30] jfs: remove initialization of " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 07/30] nilfs2: remove inode->i_version initialization Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 08/30] orangefs: remove initialization of i_version Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 09/30] reiserfs: remove unneeded i_version bump Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 10/30] ntfs: remove i_version handling Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 11/30] fs: new API for handling i_version Jeff Layton
2017-03-03 22:36 ` J. Bruce Fields
2017-03-04 0:09 ` Jeff Layton
2017-03-03 23:55 ` NeilBrown
2017-03-04 1:58 ` Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 12/30] fat: convert to new i_version API Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 13/30] affs: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 14/30] afs: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 15/30] btrfs: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 16/30] exofs: switch " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 17/30] ext2: convert " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 18/30] ext4: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 19/30] nfs: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 20/30] nfsd: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 21/30] ocfs2: " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 22/30] ufs: use " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 23/30] xfs: convert to " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 24/30] IMA: switch IMA over " Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 25/30] fs: add a "force" parameter to inode_inc_iversion Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 26/30] fs: only set S_VERSION when updating times if it has been queried Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 27/30] xfs: avoid setting XFS_ILOG_CORE if i_version doesn't need incrementing Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 28/30] btrfs: only dirty the inode in btrfs_update_time if something was changed Jeff Layton
2016-12-21 17:03 ` [RFC PATCH v1 29/30] fs: track whether the i_version has been queried with an i_state flag Jeff Layton
2017-03-04 0:03 ` NeilBrown
2017-03-04 0:43 ` Jeff Layton [this message]
2016-12-21 17:03 ` [RFC PATCH v1 30/30] fs: convert i_version counter over to an atomic64_t Jeff Layton
2016-12-22 8:38 ` Amir Goldstein
2016-12-22 13:27 ` Jeff Layton
2017-03-04 0:00 ` NeilBrown
2016-12-22 8:45 ` [RFC PATCH v1 00/30] fs: inode->i_version rework and optimization Christoph Hellwig
2016-12-22 14:42 ` Jeff Layton
2017-03-20 21:43 ` J. Bruce Fields
2017-03-21 13:45 ` Christoph Hellwig
2017-03-21 16:30 ` J. Bruce Fields
2017-03-21 17:23 ` Jeff Layton
2017-03-21 17:37 ` J. Bruce Fields
2017-03-21 17:51 ` J. Bruce Fields
2017-03-21 18:30 ` J. Bruce Fields
2017-03-21 18:46 ` Jeff Layton
2017-03-21 19:13 ` J. Bruce Fields
2017-03-21 21:54 ` Jeff Layton
2017-03-29 11:15 ` Jan Kara
2017-03-29 17:54 ` Jeff Layton
2017-03-29 23:41 ` Dave Chinner
2017-03-30 11:24 ` Jeff Layton
2017-04-04 18:38 ` J. Bruce Fields
2017-03-30 6:47 ` Jan Kara
2017-03-30 11:11 ` Jeff Layton
2017-03-30 16:12 ` J. Bruce Fields
2017-03-30 18:35 ` Jeff Layton
2017-03-30 21:11 ` Boaz Harrosh
2017-04-04 18:31 ` J. Bruce Fields
2017-04-05 1:43 ` NeilBrown
2017-04-05 8:05 ` Jan Kara
2017-04-05 18:14 ` J. Bruce Fields
2017-05-11 18:59 ` J. Bruce Fields
2017-05-11 22:22 ` NeilBrown
2017-05-12 16:21 ` J. Bruce Fields
2017-10-30 13:21 ` Jeff Layton
2017-05-12 8:27 ` Jan Kara
2017-05-12 15:56 ` J. Bruce Fields
2017-05-12 11:01 ` Jeff Layton
2017-05-12 15:57 ` J. Bruce Fields
2017-04-06 1:12 ` NeilBrown
2017-04-06 7:22 ` Jan Kara
2017-04-05 17:26 ` J. Bruce Fields
2017-04-01 23:05 ` Dave Chinner
2017-04-03 14:00 ` Jan Kara
2017-04-04 12:34 ` Dave Chinner
2017-04-04 17:53 ` J. Bruce Fields
2017-04-05 1:26 ` NeilBrown
2017-03-21 21:45 ` Dave Chinner
2017-03-22 19:53 ` Jeff Layton
2017-03-03 23:00 ` J. Bruce Fields
2017-03-04 0:53 ` Jeff Layton
2017-03-08 17:29 ` J. Bruce Fields
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