[Devel] [PATCH] nfsd: make NFSv4 recovery client tracking options per net

[Jeff Layton]

On Tue, 04 Dec 2012 14:29:27 +0300
Stanislav Kinsbursky <skinsbursky at parallels.com> wrote:

> Pointer to client tracking operations - client_tracking_ops - have to be
> containerized, because different environment can support different trackers
> (for example, legacy tracker currently is not suported in container).
> 
> Signed-off-by: Stanislav Kinsbursky <skinsbursky at parallels.com>
> ---
>  fs/nfsd/netns.h       |    2 ++
>  fs/nfsd/nfs4recover.c |   48 ++++++++++++++++++++++++++++--------------------
>  2 files changed, 30 insertions(+), 20 deletions(-)
> 
> diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
> index 2c4b2e2..bca789d 100644
> --- a/fs/nfsd/netns.h
> +++ b/fs/nfsd/netns.h
> @@ -35,6 +35,7 @@
>  #define SESSION_HASH_SIZE	512
>  
>  struct cld_net;
> +struct nfsd4_client_tracking_ops;
>  
>  struct nfsd_net {
>  	struct cld_net *cld_net;
> @@ -87,6 +88,7 @@ struct nfsd_net {
>  
>  	struct file *rec_file;
>  	bool in_grace;
> +	struct nfsd4_client_tracking_ops *client_tracking_ops;
>  
>  	time_t nfsd4_lease;
>  	time_t nfsd4_grace;
> diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
> index 359793f..ba6fdd4 100644
> --- a/fs/nfsd/nfs4recover.c
> +++ b/fs/nfsd/nfs4recover.c
> @@ -63,7 +63,6 @@ struct nfsd4_client_tracking_ops {
>  
>  /* Globals */
>  static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
> -static struct nfsd4_client_tracking_ops *client_tracking_ops;
>  
>  static int
>  nfs4_save_creds(const struct cred **original_creds)
> @@ -1262,17 +1261,18 @@ nfsd4_client_tracking_init(struct net *net)
>  {
>  	int status;
>  	struct path path;
> +	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
>  
>  	/* just run the init if it the method is already decided */
> -	if (client_tracking_ops)
> +	if (nn->client_tracking_ops)
>  		goto do_init;
>  
>  	/*
>  	 * First, try a UMH upcall. It should succeed or fail quickly, so
>  	 * there's little harm in trying that first.
>  	 */
> -	client_tracking_ops = &nfsd4_umh_tracking_ops;
> -	status = client_tracking_ops->init(net);
> +	nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
> +	status = nn->client_tracking_ops->init(net);
>  	if (!status)
>  		return status;
>  
> @@ -1280,7 +1280,7 @@ nfsd4_client_tracking_init(struct net *net)
>  	 * See if the recoverydir exists and is a directory. If it is,
>  	 * then use the legacy ops.
>  	 */
> -	client_tracking_ops = &nfsd4_legacy_tracking_ops;
> +	nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
>  	status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
>  	if (!status) {
>  		status = S_ISDIR(path.dentry->d_inode->i_mode);
> @@ -1290,16 +1290,16 @@ nfsd4_client_tracking_init(struct net *net)
>  	}
>  
>  	/* Finally, try to use nfsdcld */
> -	client_tracking_ops = &nfsd4_cld_tracking_ops;
> +	nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
>  	printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
>  			"removed in 3.10. Please transition to using "
>  			"nfsdcltrack.\n");
>  do_init:
> -	status = client_tracking_ops->init(net);
> +	status = nn->client_tracking_ops->init(net);
>  	if (status) {
>  		printk(KERN_WARNING "NFSD: Unable to initialize client "
>  				    "recovery tracking! (%d)\n", status);
> -		client_tracking_ops = NULL;
> +		nn->client_tracking_ops = NULL;
>  	}
>  	return status;
>  }
> @@ -1307,32 +1307,40 @@ do_init:
>  void
>  nfsd4_client_tracking_exit(struct net *net)
>  {
> -	if (client_tracking_ops) {
> -		if (client_tracking_ops->exit)
> -			client_tracking_ops->exit(net);
> -		client_tracking_ops = NULL;
> +	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> +
> +	if (nn->client_tracking_ops) {
> +		if (nn->client_tracking_ops->exit)
> +			nn->client_tracking_ops->exit(net);
> +		nn->client_tracking_ops = NULL;
>  	}
>  }
>  
>  void
>  nfsd4_client_record_create(struct nfs4_client *clp)
>  {
> -	if (client_tracking_ops)
> -		client_tracking_ops->create(clp);
> +	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
> +
> +	if (nn->client_tracking_ops)
> +		nn->client_tracking_ops->create(clp);
>  }
>  
>  void
>  nfsd4_client_record_remove(struct nfs4_client *clp)
>  {
> -	if (client_tracking_ops)
> -		client_tracking_ops->remove(clp);
> +	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
> +
> +	if (nn->client_tracking_ops)
> +		nn->client_tracking_ops->remove(clp);
>  }
>  
>  int
>  nfsd4_client_record_check(struct nfs4_client *clp)
>  {
> -	if (client_tracking_ops)
> -		return client_tracking_ops->check(clp);
> +	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
> +
> +	if (nn->client_tracking_ops)
> +		return nn->client_tracking_ops->check(clp);
>  
>  	return -EOPNOTSUPP;
>  }
> @@ -1340,8 +1348,8 @@ nfsd4_client_record_check(struct nfs4_client *clp)
>  void
>  nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
>  {
> -	if (client_tracking_ops)
> -		client_tracking_ops->grace_done(nn, boot_time);
> +	if (nn->client_tracking_ops)
> +		nn->client_tracking_ops->grace_done(nn, boot_time);
>  }
>  
>  static int
> 
> --
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Looks reasonable...

Reviewed-by: Jeff Layton <jlayton at redhat.com>