From: NeilBrown <neil@brown.name>
To: Jeff Layton <jlayton@redhat.com>, linux-fsdevel@vger.kernel.org
Date: Sat, 04 Mar 2017 10:55:04 +1100
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 11/30] fs: new API for handling i_version
In-Reply-To: <1482339827-7882-12-git-send-email-jlayton@redhat.com>
References: <1482339827-7882-1-git-send-email-jlayton@redhat.com> <1482339827-7882-12-git-send-email-jlayton@redhat.com>
Message-ID: <8737etncfb.fsf@notabene.neil.brown.name>
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On Wed, Dec 21 2016, Jeff Layton wrote:

> We already have inode_inc_iversion. Add inode_set_iversion,
> inode_get_iversion, inode_cmp_iversion and inode_iversion_need_inc.

This list of added interfaces is incomplete.
And some of these interfaces could really use some justification up
front.

You later add a "force" parameter to inode_inc_version.
Why not do that up front here?

> +
> +/**
> + * inode_get_iversion - read i_version for later use
> + * @inode: inode from which i_version should be read
> + *
> + * Read the inode i_version counter. This should be used by callers that wish
> + * to store the returned i_version for later comparison.
> + */
> +static inline u64
> +inode_get_iversion(const struct inode *inode)
> +{
> +	return inode_get_iversion_raw(inode);
> +}

I don't understand why this can use the _raw version rather than the
_read version.
Surely you need to know about any changes after this read.

Thanks,
NeilBrown

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