linux-kernel - Re: [RFC PATCH v1 29/30] fs: track whether the i_version has been queried with an i

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Message-ID: <87wpc5lxg6.fsf@notabene.neil.brown.name>
Date:   Sat, 04 Mar 2017 11:03:53 +1100
From:   NeilBrown <neil@...wn.name>
To:     Jeff Layton <jlayton@...hat.com>, linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: Re: [RFC PATCH v1 29/30] fs: track whether the i_version has been queried with an i_state flag

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

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