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Message-ID: <20120411213245.GD31706@fieldses.org>
Date: Wed, 11 Apr 2012 17:32:45 -0400
From: "J. Bruce Fields" <bfields@...ldses.org>
To: Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc: "Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
Pavel Emelianov <xemul@...allels.com>,
"neilb@...e.de" <neilb@...e.de>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
James Bottomley <jbottomley@...allels.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"devel@...nvz.org" <devel@...nvz.org>
Subject: Re: [PATCH v2] Lockd: pass network namespace to creation and
destruction routines
On Wed, Apr 11, 2012 at 08:12:04PM +0400, Stanislav Kinsbursky wrote:
> 11.04.2012 20:11, J. Bruce Fields пишет:
> >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?
> >
>
> Your tree is preferred since I'm working with it.
OK, applying.--b.
>
> >--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 */
> >>
>
>
> --
> Best regards,
> Stanislav Kinsbursky
--
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