X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fproc%2Froot.c;h=95117538a4f6fd3b4fdc90558127caa282d7e800;hb=9bd6ceb666e76b9a3caefa158827a571ead55b6a;hp=5834a744c2a96fec843290a83a38c090f34618d5;hpb=77b14db502cb85a031fe8fde6c85d52f3e0acb63;p=linux-2.6-omap-h63xx.git

diff --git a/fs/proc/root.c b/fs/proc/root.c
index 5834a744c2a..95117538a4f 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -18,32 +18,88 @@
 #include <linux/bitops.h>
 #include <linux/smp_lock.h>
 #include <linux/mount.h>
+#include <linux/pid_namespace.h>
 
 #include "internal.h"
 
-struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
+static int proc_test_super(struct super_block *sb, void *data)
+{
+	return sb->s_fs_info == data;
+}
+
+static int proc_set_super(struct super_block *sb, void *data)
+{
+	struct pid_namespace *ns;
+
+	ns = (struct pid_namespace *)data;
+	sb->s_fs_info = get_pid_ns(ns);
+	return set_anon_super(sb, NULL);
+}
 
 static int proc_get_sb(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
+	int err;
+	struct super_block *sb;
+	struct pid_namespace *ns;
+	struct proc_inode *ei;
+
 	if (proc_mnt) {
 		/* Seed the root directory with a pid so it doesn't need
 		 * to be special in base.c.  I would do this earlier but
 		 * the only task alive when /proc is mounted the first time
 		 * is the init_task and it doesn't have any pids.
 		 */
-		struct proc_inode *ei;
 		ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode);
 		if (!ei->pid)
 			ei->pid = find_get_pid(1);
 	}
-	return get_sb_single(fs_type, flags, data, proc_fill_super, mnt);
+
+	if (flags & MS_KERNMOUNT)
+		ns = (struct pid_namespace *)data;
+	else
+		ns = current->nsproxy->pid_ns;
+
+	sb = sget(fs_type, proc_test_super, proc_set_super, ns);
+	if (IS_ERR(sb))
+		return PTR_ERR(sb);
+
+	if (!sb->s_root) {
+		sb->s_flags = flags;
+		err = proc_fill_super(sb);
+		if (err) {
+			up_write(&sb->s_umount);
+			deactivate_super(sb);
+			return err;
+		}
+
+		ei = PROC_I(sb->s_root->d_inode);
+		if (!ei->pid) {
+			rcu_read_lock();
+			ei->pid = get_pid(find_pid_ns(1, ns));
+			rcu_read_unlock();
+		}
+
+		sb->s_flags |= MS_ACTIVE;
+		ns->proc_mnt = mnt;
+	}
+
+	return simple_set_mnt(mnt, sb);
+}
+
+static void proc_kill_sb(struct super_block *sb)
+{
+	struct pid_namespace *ns;
+
+	ns = (struct pid_namespace *)sb->s_fs_info;
+	kill_anon_super(sb);
+	put_pid_ns(ns);
 }
 
 static struct file_system_type proc_fs_type = {
 	.name		= "proc",
 	.get_sb		= proc_get_sb,
-	.kill_sb	= kill_anon_super,
+	.kill_sb	= proc_kill_sb,
 };
 
 void __init proc_root_init(void)
@@ -54,21 +110,22 @@ void __init proc_root_init(void)
 	err = register_filesystem(&proc_fs_type);
 	if (err)
 		return;
-	proc_mnt = kern_mount(&proc_fs_type);
+	proc_mnt = kern_mount_data(&proc_fs_type, &init_pid_ns);
 	err = PTR_ERR(proc_mnt);
 	if (IS_ERR(proc_mnt)) {
 		unregister_filesystem(&proc_fs_type);
 		return;
 	}
+
 	proc_misc_init();
-	proc_net = proc_mkdir("net", NULL);
-	proc_net_stat = proc_mkdir("net/stat", NULL);
+
+	proc_net_init();
 
 #ifdef CONFIG_SYSVIPC
 	proc_mkdir("sysvipc", NULL);
 #endif
-	proc_root_fs = proc_mkdir("fs", NULL);
-	proc_root_driver = proc_mkdir("driver", NULL);
+	proc_mkdir("fs", NULL);
+	proc_mkdir("driver", NULL);
 	proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
 #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
 	/* just give it a mountpoint */
@@ -78,10 +135,8 @@ void __init proc_root_init(void)
 #ifdef CONFIG_PROC_DEVICETREE
 	proc_device_tree_init();
 #endif
-	proc_bus = proc_mkdir("bus", NULL);
-#ifdef CONFIG_SYSCTL
+	proc_mkdir("bus", NULL);
 	proc_sys_init();
-#endif
 }
 
 static int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat
@@ -150,18 +205,30 @@ struct proc_dir_entry proc_root = {
 	.name		= "/proc",
 	.mode		= S_IFDIR | S_IRUGO | S_IXUGO, 
 	.nlink		= 2, 
+	.count		= ATOMIC_INIT(1),
 	.proc_iops	= &proc_root_inode_operations, 
 	.proc_fops	= &proc_root_operations,
 	.parent		= &proc_root,
 };
 
+int pid_ns_prepare_proc(struct pid_namespace *ns)
+{
+	struct vfsmount *mnt;
+
+	mnt = kern_mount_data(&proc_fs_type, ns);
+	if (IS_ERR(mnt))
+		return PTR_ERR(mnt);
+
+	return 0;
+}
+
+void pid_ns_release_proc(struct pid_namespace *ns)
+{
+	mntput(ns->proc_mnt);
+}
+
 EXPORT_SYMBOL(proc_symlink);
 EXPORT_SYMBOL(proc_mkdir);
 EXPORT_SYMBOL(create_proc_entry);
+EXPORT_SYMBOL(proc_create_data);
 EXPORT_SYMBOL(remove_proc_entry);
-EXPORT_SYMBOL(proc_root);
-EXPORT_SYMBOL(proc_root_fs);
-EXPORT_SYMBOL(proc_net);
-EXPORT_SYMBOL(proc_net_stat);
-EXPORT_SYMBOL(proc_bus);
-EXPORT_SYMBOL(proc_root_driver);