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Message-ID: <20120411161114.GB28928@fieldses.org>
Date: Wed, 11 Apr 2012 12:11:14 -0400
From: "J. Bruce Fields" <bfields@...ldses.org>
To: Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc: Trond.Myklebust@...app.com, linux-nfs@...r.kernel.org,
xemul@...allels.com, neilb@...e.de, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, jbottomley@...allels.com,
davem@...emloft.net, devel@...nvz.org
Subject: Re: [PATCH v2] Lockd: pass network namespace to creation and
destruction routines
On Thu, Mar 29, 2012 at 06:54:33PM +0400, Stanislav Kinsbursky wrote:
> v2: dereference of most probably already released nlm_host removed in
> nlmclnt_done() and reclaimer().
Did you want this in Trond's tree or mine?
--b.
>
> These routines are called from locks reclaimer() kernel thread. This thread
> works in "init_net" network context and currently relays on persence on lockd
> thread and it's per-net resources. Thus lockd_up() and lockd_down() can't relay
> on current network context. So let's pass corrent one into them.
>
> Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
>
> Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
>
> ---
> fs/lockd/clntlock.c | 13 ++++++++-----
> fs/lockd/svc.c | 7 +++----
> fs/nfsd/nfssvc.c | 6 +++---
> include/linux/lockd/bind.h | 4 ++--
> 4 files changed, 16 insertions(+), 14 deletions(-)
>
> diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
> index ba1dc2e..ca0a080 100644
> --- a/fs/lockd/clntlock.c
> +++ b/fs/lockd/clntlock.c
> @@ -56,7 +56,7 @@ struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init)
> u32 nlm_version = (nlm_init->nfs_version == 2) ? 1 : 4;
> int status;
>
> - status = lockd_up();
> + status = lockd_up(nlm_init->net);
> if (status < 0)
> return ERR_PTR(status);
>
> @@ -65,7 +65,7 @@ struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init)
> nlm_init->hostname, nlm_init->noresvport,
> nlm_init->net);
> if (host == NULL) {
> - lockd_down();
> + lockd_down(nlm_init->net);
> return ERR_PTR(-ENOLCK);
> }
>
> @@ -80,8 +80,10 @@ EXPORT_SYMBOL_GPL(nlmclnt_init);
> */
> void nlmclnt_done(struct nlm_host *host)
> {
> + struct net *net = host->net;
> +
> nlmclnt_release_host(host);
> - lockd_down();
> + lockd_down(net);
> }
> EXPORT_SYMBOL_GPL(nlmclnt_done);
>
> @@ -220,11 +222,12 @@ reclaimer(void *ptr)
> struct nlm_wait *block;
> struct file_lock *fl, *next;
> u32 nsmstate;
> + struct net *net = host->net;
>
> allow_signal(SIGKILL);
>
> down_write(&host->h_rwsem);
> - lockd_up(); /* note: this cannot fail as lockd is already running */
> + lockd_up(net); /* note: this cannot fail as lockd is already running */
>
> dprintk("lockd: reclaiming locks for host %s\n", host->h_name);
>
> @@ -275,6 +278,6 @@ restart:
>
> /* Release host handle after use */
> nlmclnt_release_host(host);
> - lockd_down();
> + lockd_down(net);
> return 0;
> }
> diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
> index b34100e..ce4c80e 100644
> --- a/fs/lockd/svc.c
> +++ b/fs/lockd/svc.c
> @@ -295,11 +295,10 @@ static void lockd_down_net(struct net *net)
> /*
> * Bring up the lockd process if it's not already up.
> */
> -int lockd_up(void)
> +int lockd_up(struct net *net)
> {
> struct svc_serv *serv;
> int error = 0;
> - struct net *net = current->nsproxy->net_ns;
>
> mutex_lock(&nlmsvc_mutex);
> /*
> @@ -377,12 +376,12 @@ EXPORT_SYMBOL_GPL(lockd_up);
> * Decrement the user count and bring down lockd if we're the last.
> */
> void
> -lockd_down(void)
> +lockd_down(struct net *net)
> {
> mutex_lock(&nlmsvc_mutex);
> if (nlmsvc_users) {
> if (--nlmsvc_users) {
> - lockd_down_net(current->nsproxy->net_ns);
> + lockd_down_net(net);
> goto out;
> }
> } else {
> diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> index fce472f..0f3e35b 100644
> --- a/fs/nfsd/nfssvc.c
> +++ b/fs/nfsd/nfssvc.c
> @@ -220,7 +220,7 @@ static int nfsd_startup(unsigned short port, int nrservs)
> ret = nfsd_init_socks(port);
> if (ret)
> goto out_racache;
> - ret = lockd_up();
> + ret = lockd_up(&init_net);
> if (ret)
> goto out_racache;
> ret = nfs4_state_start();
> @@ -229,7 +229,7 @@ static int nfsd_startup(unsigned short port, int nrservs)
> nfsd_up = true;
> return 0;
> out_lockd:
> - lockd_down();
> + lockd_down(&init_net);
> out_racache:
> nfsd_racache_shutdown();
> return ret;
> @@ -246,7 +246,7 @@ static void nfsd_shutdown(void)
> if (!nfsd_up)
> return;
> nfs4_state_shutdown();
> - lockd_down();
> + lockd_down(&init_net);
> nfsd_racache_shutdown();
> nfsd_up = false;
> }
> diff --git a/include/linux/lockd/bind.h b/include/linux/lockd/bind.h
> index 11a966e..4d24d64 100644
> --- a/include/linux/lockd/bind.h
> +++ b/include/linux/lockd/bind.h
> @@ -54,7 +54,7 @@ extern void nlmclnt_done(struct nlm_host *host);
>
> extern int nlmclnt_proc(struct nlm_host *host, int cmd,
> struct file_lock *fl);
> -extern int lockd_up(void);
> -extern void lockd_down(void);
> +extern int lockd_up(struct net *net);
> +extern void lockd_down(struct net *net);
>
> #endif /* LINUX_LOCKD_BIND_H */
>
--
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