Return-Path: linux-nfs-owner@vger.kernel.org Received: from mailhub.sw.ru ([195.214.232.25]:34779 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752923Ab2AWR0b (ORCPT ); Mon, 23 Jan 2012 12:26:31 -0500 Subject: [PATCH 2/4] NFS: make nfs_volume_list per net ns To: Trond.Myklebust@netapp.com From: Stanislav Kinsbursky Cc: linux-nfs@vger.kernel.org, xemul@parallels.com, neilb@suse.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, jbottomley@parallels.com, bfields@fieldses.org, davem@davemloft.net, devel@openvz.org Date: Mon, 23 Jan 2012 21:26:14 +0400 Message-ID: <20120123172614.29637.57376.stgit@localhost6.localdomain6> In-Reply-To: <20120123171404.29637.19810.stgit@localhost6.localdomain6> References: <20120123171404.29637.19810.stgit@localhost6.localdomain6> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: This patch splits global list of NFS servers into per-net-ns array of lists. This looks more strict and clearer. BTW, this patch also makes "/proc/fs/nfsfs/volumes" content depends on /proc mount owner pid namespace. See below for details. NOTE: few words about how was /proc/fs/nfsfs/ entries content show per network namespace done. This is a little bit tricky and not the best is could be. But it's cheap (proper fix for /proc conteinerization is a hard nut to crack). The idea is simple: take proper network namespace from pid namespace child reaper nsproxy of /proc/ mount creator. This actually means, that if there are 2 containers with different net namespace sharing pid namespace, then read of /proc/fs/nfsfs/ entries will always return content, taken from net namespace of pid namespace creator task (and thus second namespace set wil be unvisible). Signed-off-by: Stanislav Kinsbursky --- fs/nfs/client.c | 20 ++++++++++++++------ fs/nfs/netns.h | 1 + 2 files changed, 15 insertions(+), 6 deletions(-) diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 058eb9b..d58e838 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -56,7 +56,6 @@ #define NFSDBG_FACILITY NFSDBG_CLIENT DEFINE_SPINLOCK(nfs_client_lock); -static LIST_HEAD(nfs_volume_list); static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); #ifdef CONFIG_NFS_V4 static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */ @@ -1036,10 +1035,11 @@ static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_serve static void nfs_server_insert_lists(struct nfs_server *server) { struct nfs_client *clp = server->nfs_client; + struct nfs_net *nn = net_generic(clp->net, nfs_net_id); spin_lock(&nfs_client_lock); list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); - list_add_tail(&server->master_link, &nfs_volume_list); + list_add_tail(&server->master_link, &nn->nfs_volume_list); clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); spin_unlock(&nfs_client_lock); @@ -1764,6 +1764,7 @@ void nfs_clients_init(struct net *net) struct nfs_net *nn = net_generic(net, nfs_net_id); INIT_LIST_HEAD(&nn->nfs_client_list); + INIT_LIST_HEAD(&nn->nfs_volume_list); } #ifdef CONFIG_PROC_FS @@ -1900,13 +1901,15 @@ static int nfs_volume_list_open(struct inode *inode, struct file *file) { struct seq_file *m; int ret; + struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; + struct net *net = pid_ns->child_reaper->nsproxy->net_ns; ret = seq_open(file, &nfs_volume_list_ops); if (ret < 0) return ret; m = file->private_data; - m->private = PDE(inode)->data; + m->private = net; return 0; } @@ -1916,9 +1919,11 @@ static int nfs_volume_list_open(struct inode *inode, struct file *file) */ static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) { + struct nfs_net *nn = net_generic(m->private, nfs_net_id); + /* lock the list against modification */ spin_lock(&nfs_client_lock); - return seq_list_start_head(&nfs_volume_list, *_pos); + return seq_list_start_head(&nn->nfs_volume_list, *_pos); } /* @@ -1926,7 +1931,9 @@ static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) */ static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) { - return seq_list_next(v, &nfs_volume_list, pos); + struct nfs_net *nn = net_generic(p->private, nfs_net_id); + + return seq_list_next(v, &nn->nfs_volume_list, pos); } /* @@ -1945,9 +1952,10 @@ static int nfs_volume_list_show(struct seq_file *m, void *v) struct nfs_server *server; struct nfs_client *clp; char dev[8], fsid[17]; + struct nfs_net *nn = net_generic(m->private, nfs_net_id); /* display header on line 1 */ - if (v == &nfs_volume_list) { + if (v == &nn->nfs_volume_list) { seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); return 0; } diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h index feb33c3..0fbd4e0 100644 --- a/fs/nfs/netns.h +++ b/fs/nfs/netns.h @@ -8,6 +8,7 @@ struct nfs_net { struct cache_detail *nfs_dns_resolve; struct rpc_pipe *bl_device_pipe; struct list_head nfs_client_list; + struct list_head nfs_volume_list; }; extern int nfs_net_id;