linux-kernel - Re: [PATCH v2 09/15] NFSd: make nfsd4_manager allocated per network namespace context.

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Message-ID: <20120727214625.GD6388@fieldses.org>
Date:	Fri, 27 Jul 2012 17:46:25 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	linux-nfs@...r.kernel.org, Trond.Myklebust@...app.com,
	linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: Re: [PATCH v2 09/15] NFSd: make nfsd4_manager allocated per
 network namespace context.

On Wed, Jul 25, 2012 at 04:56:58PM +0400, Stanislav Kinsbursky wrote:
> Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
> ---
>  fs/nfsd/netns.h     |    2 ++
>  fs/nfsd/nfs4state.c |   32 +++++++++++++++++++-------------
>  2 files changed, 21 insertions(+), 13 deletions(-)
> 
> diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
> index 3936563..e99767d 100644
> --- a/fs/nfsd/netns.h
> +++ b/fs/nfsd/netns.h
> @@ -34,6 +34,8 @@ struct nfsd_net {
>  
>  	struct cache_detail *idtoname_cache;
>  	struct cache_detail *nametoid_cache;
> +
> +	struct lock_manager nfsd4_manager;
>  };
>  
>  extern int nfsd_net_id;
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index ab0a02a..fad2408 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -45,6 +45,8 @@
>  #include "vfs.h"
>  #include "current_stateid.h"
>  
> +#include "netns.h"
> +
>  #define NFSDDBG_FACILITY                NFSDDBG_PROC
>  
>  /* Globals */
> @@ -3115,22 +3117,21 @@ out:
>  	return status;
>  }
>  
> -static struct lock_manager nfsd4_manager = {
> -};
> -
>  static bool grace_ended;
>  
>  static void
> -nfsd4_end_grace(void)
> +nfsd4_end_grace(struct net *net)
>  {
> +	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> +
>  	/* do nothing if grace period already ended */
>  	if (grace_ended)
>  		return;

That doesn't look right....

But, OK, looking through later patches I see you make grace_ended
per-namespace later.  OK.

--b.

>  
>  	dprintk("NFSD: end of grace period\n");
>  	grace_ended = true;
> -	nfsd4_record_grace_done(&init_net, boot_time);
> -	locks_end_grace(&nfsd4_manager);
> +	nfsd4_record_grace_done(net, boot_time);
> +	locks_end_grace(&nn->nfsd4_manager);
>  	/*
>  	 * Now that every NFSv4 client has had the chance to recover and
>  	 * to see the (possibly new, possibly shorter) lease time, we
> @@ -3153,7 +3154,7 @@ nfs4_laundromat(void)
>  	nfs4_lock_state();
>  
>  	dprintk("NFSD: laundromat service - starting\n");
> -	nfsd4_end_grace();
> +	nfsd4_end_grace(&init_net);
>  	INIT_LIST_HEAD(&reaplist);
>  	spin_lock(&client_lock);
>  	list_for_each_safe(pos, next, &client_lru) {
> @@ -4687,6 +4688,8 @@ set_max_delegations(void)
>  int
>  nfs4_state_start(void)
>  {
> +	struct net *net = &init_net;
> +	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
>  	int ret;
>  
>  	/*
> @@ -4696,10 +4699,10 @@ nfs4_state_start(void)
>  	 * to that instead and then do most of the rest of this on a per-net
>  	 * basis.
>  	 */
> -	get_net(&init_net);
> -	nfsd4_client_tracking_init(&init_net);
> +	get_net(net);
> +	nfsd4_client_tracking_init(net);
>  	boot_time = get_seconds();
> -	locks_start_grace(&nfsd4_manager);
> +	locks_start_grace(&nn->nfsd4_manager);
>  	grace_ended = false;
>  	printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
>  	       nfsd4_grace);
> @@ -4722,8 +4725,8 @@ nfs4_state_start(void)
>  out_free_laundry:
>  	destroy_workqueue(laundry_wq);
>  out_recovery:
> -	nfsd4_client_tracking_exit(&init_net);
> -	put_net(&init_net);
> +	nfsd4_client_tracking_exit(net);
> +	put_net(net);
>  	return ret;
>  }
>  
> @@ -4764,9 +4767,12 @@ __nfs4_state_shutdown(void)
>  void
>  nfs4_state_shutdown(void)
>  {
> +	struct net *net = &init_net;
> +	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> +
>  	cancel_delayed_work_sync(&laundromat_work);
>  	destroy_workqueue(laundry_wq);
> -	locks_end_grace(&nfsd4_manager);
> +	locks_end_grace(&nn->nfsd4_manager);
>  	nfs4_lock_state();
>  	__nfs4_state_shutdown();
>  	nfs4_unlock_state();
> 
--
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