[Devel] [PATCH] Merge sys_clone() and sys_unshare() nsproxy handling

Badari Pulavarty pbadari at us.ibm.com
Mon Feb 26 16:40:16 PST 2007


Hi,

sys_clone() and sys_unshare() handles copy/clone of nsproxy
and its associated namespaces differently.

This patch merges all the handling into common functions
(as much as possible). 

Please review. If no objections, I would like to submit for 
inclusion into -mm.

Ran standard LTP tests, unshare uts, ipc tests fine.

Thanks,
Badari

Merge sys_clone/sys_unshare nsproxy and namespace copy handling.

- Create a new nsproxy and its associated namespaces and pass it
back to caller to attach it to right process.

- Changed all copy_*_ns() routines to attach the namespace to
passed in new nsproxy instead of task->nsproxy.

- Get rid of all individual unshare_*_ns() routines and make
use of copy_*_ns() instead.


Signed-off-by: Badari Pulavarty <pbadari at us.ibm.com>
---
 fs/namespace.c                |   11 +--
 include/linux/ipc.h           |    8 +-
 include/linux/mnt_namespace.h |    5 -
 include/linux/nsproxy.h       |    2 
 include/linux/pid_namespace.h |    3 
 include/linux/utsname.h       |   16 -----
 ipc/util.c                    |   24 -------
 kernel/fork.c                 |   85 +-------------------------
 kernel/nsproxy.c              |  133 +++++++++++++++++++++++++-----------------
 kernel/pid.c                  |    4 -
 kernel/utsname.c              |   24 -------
 11 files changed, 113 insertions(+), 202 deletions(-)

Index: linux-2.6.21-rc1/fs/namespace.c
===================================================================
--- linux-2.6.21-rc1.orig/fs/namespace.c	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/fs/namespace.c	2007-02-26 10:27:42.000000000 -0800
@@ -1441,10 +1441,9 @@ dput_out:
  * Allocate a new namespace structure and populate it with contents
  * copied from the namespace of the passed in task structure.
  */
-struct mnt_namespace *dup_mnt_ns(struct task_struct *tsk,
+static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
 		struct fs_struct *fs)
 {
-	struct mnt_namespace *mnt_ns = tsk->nsproxy->mnt_ns;
 	struct mnt_namespace *new_ns;
 	struct vfsmount *rootmnt = NULL, *pwdmnt = NULL, *altrootmnt = NULL;
 	struct vfsmount *p, *q;
@@ -1509,9 +1508,9 @@ struct mnt_namespace *dup_mnt_ns(struct 
 	return new_ns;
 }
 
-int copy_mnt_ns(int flags, struct task_struct *tsk)
+int copy_mnt_ns(int flags, struct mnt_namespace *ns, struct nsproxy *new_nsp,
+		struct fs_struct *new_fs)
 {
-	struct mnt_namespace *ns = tsk->nsproxy->mnt_ns;
 	struct mnt_namespace *new_ns;
 	int err = 0;
 
@@ -1528,13 +1527,13 @@ int copy_mnt_ns(int flags, struct task_s
 		goto out;
 	}
 
-	new_ns = dup_mnt_ns(tsk, tsk->fs);
+	new_ns = dup_mnt_ns(ns, new_fs);
 	if (!new_ns) {
 		err = -ENOMEM;
 		goto out;
 	}
 
-	tsk->nsproxy->mnt_ns = new_ns;
+	new_nsp->mnt_ns = new_ns;
 
 out:
 	put_mnt_ns(ns);
Index: linux-2.6.21-rc1/include/linux/mnt_namespace.h
===================================================================
--- linux-2.6.21-rc1.orig/include/linux/mnt_namespace.h	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/include/linux/mnt_namespace.h	2007-02-26 10:27:42.000000000 -0800
@@ -14,10 +14,9 @@ struct mnt_namespace {
 	int event;
 };
 
-extern int copy_mnt_ns(int, struct task_struct *);
-extern void __put_mnt_ns(struct mnt_namespace *ns);
-extern struct mnt_namespace *dup_mnt_ns(struct task_struct *,
+extern int copy_mnt_ns(int, struct mnt_namespace *, struct nsproxy *,
 		struct fs_struct *);
+extern void __put_mnt_ns(struct mnt_namespace *ns);
 
 static inline void put_mnt_ns(struct mnt_namespace *ns)
 {
Index: linux-2.6.21-rc1/kernel/nsproxy.c
===================================================================
--- linux-2.6.21-rc1.orig/kernel/nsproxy.c	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/kernel/nsproxy.c	2007-02-26 10:27:42.000000000 -0800
@@ -38,8 +38,6 @@ void get_task_namespaces(struct task_str
 
 /*
  * creates a copy of "orig" with refcount 1.
- * This does not grab references to the contained namespaces,
- * so that needs to be done by dup_namespaces.
  */
 static inline struct nsproxy *clone_namespaces(struct nsproxy *orig)
 {
@@ -52,26 +50,50 @@ static inline struct nsproxy *clone_name
 }
 
 /*
- * copies the nsproxy, setting refcount to 1, and grabbing a
- * reference to all contained namespaces.  Called from
- * sys_unshare()
+ * Create new nsproxy and all of its the associated namespaces.
+ * Return the newly created nsproxy.  Do not attach this to the task,
+ * leave it to the caller to do proper locking and attach it to task.
  */
-struct nsproxy *dup_namespaces(struct nsproxy *orig)
+static struct nsproxy *create_new_namespaces(int flags, struct task_struct *tsk,
+			struct fs_struct *new_fs)
 {
-	struct nsproxy *ns = clone_namespaces(orig);
+	struct nsproxy *new_nsp;
+	int err;
 
-	if (ns) {
-		if (ns->mnt_ns)
-			get_mnt_ns(ns->mnt_ns);
-		if (ns->uts_ns)
-			get_uts_ns(ns->uts_ns);
-		if (ns->ipc_ns)
-			get_ipc_ns(ns->ipc_ns);
-		if (ns->pid_ns)
-			get_pid_ns(ns->pid_ns);
-	}
+	new_nsp = clone_namespaces(tsk->nsproxy);
+	if (!new_nsp)
+		return ERR_PTR(-ENOMEM);
 
-	return ns;
+	err = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_nsp, new_fs);
+	if (err)
+		goto out_ns;
+
+	err = copy_utsname(flags, tsk->nsproxy->uts_ns, new_nsp);
+	if (err)
+		goto out_uts;
+
+	err = copy_ipcs(flags, tsk->nsproxy->ipc_ns, new_nsp);
+	if (err)
+		goto out_ipc;
+
+	err = copy_pid_ns(flags, tsk->nsproxy->pid_ns, new_nsp);
+	if (err)
+		goto out_pid;
+
+	return new_nsp;
+
+out_pid:
+	if (new_nsp->ipc_ns)
+		put_ipc_ns(new_nsp->ipc_ns);
+out_ipc:
+	if (new_nsp->uts_ns)
+		put_uts_ns(new_nsp->uts_ns);
+out_uts:
+	if (new_nsp->mnt_ns)
+		put_mnt_ns(new_nsp->mnt_ns);
+out_ns:
+	kfree(new_nsp);
+	return ERR_PTR(err);
 }
 
 /*
@@ -92,47 +114,16 @@ int copy_namespaces(int flags, struct ta
 	if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC)))
 		return 0;
 
-	new_ns = clone_namespaces(old_ns);
-	if (!new_ns) {
-		err = -ENOMEM;
+	new_ns = create_new_namespaces(flags, tsk, tsk->fs);
+	if (IS_ERR(new_ns)) {
+		err = PTR_ERR(new_ns);
 		goto out;
 	}
 
 	tsk->nsproxy = new_ns;
-
-	err = copy_mnt_ns(flags, tsk);
-	if (err)
-		goto out_ns;
-
-	err = copy_utsname(flags, tsk);
-	if (err)
-		goto out_uts;
-
-	err = copy_ipcs(flags, tsk);
-	if (err)
-		goto out_ipc;
-
-	err = copy_pid_ns(flags, tsk);
-	if (err)
-		goto out_pid;
-
 out:
 	put_nsproxy(old_ns);
 	return err;
-
-out_pid:
-	if (new_ns->ipc_ns)
-		put_ipc_ns(new_ns->ipc_ns);
-out_ipc:
-	if (new_ns->uts_ns)
-		put_uts_ns(new_ns->uts_ns);
-out_uts:
-	if (new_ns->mnt_ns)
-		put_mnt_ns(new_ns->mnt_ns);
-out_ns:
-	tsk->nsproxy = old_ns;
-	kfree(new_ns);
-	goto out;
 }
 
 void free_nsproxy(struct nsproxy *ns)
@@ -147,3 +138,41 @@ void free_nsproxy(struct nsproxy *ns)
 		put_pid_ns(ns->pid_ns);
 	kfree(ns);
 }
+
+/*
+ * Called from unshare. Unshare all the namespaces part of nsproxy.
+ * On sucess, returns the new nsproxy and a reference to old nsproxy
+ * to make sure it stays around.
+ */
+int unshare_nsproxy_namespaces(unsigned long unshare_flags,
+		struct nsproxy **new_nsp, struct fs_struct *new_fs)
+{
+	struct nsproxy *old_ns = current->nsproxy;
+	int err = 0;
+
+	if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC)))
+		return 0;
+
+#ifndef CONFIG_IPC_NS
+	if (unshare_flags & CLONE_NEWIPC)
+		return -EINVAL;
+#endif
+
+#ifndef CONFIG_UTS_NS
+	if (unshare_flags & CLONE_NEWUTS)
+		return -EINVAL;
+#endif
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	get_nsproxy(old_ns);
+
+	*new_nsp = create_new_namespaces(unshare_flags, current,
+				new_fs ? new_fs : current->fs);
+	if (IS_ERR(*new_nsp)) {
+		err = PTR_ERR(*new_nsp);
+		put_nsproxy(old_ns);
+	}
+	return err;
+}
Index: linux-2.6.21-rc1/include/linux/utsname.h
===================================================================
--- linux-2.6.21-rc1.orig/include/linux/utsname.h	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/include/linux/utsname.h	2007-02-26 10:27:42.000000000 -0800
@@ -49,9 +49,7 @@ static inline void get_uts_ns(struct uts
 }
 
 #ifdef CONFIG_UTS_NS
-extern int unshare_utsname(unsigned long unshare_flags,
-				struct uts_namespace **new_uts);
-extern int copy_utsname(int flags, struct task_struct *tsk);
+extern int copy_utsname(int flags, struct uts_namespace *ns, struct nsproxy *);
 extern void free_uts_ns(struct kref *kref);
 
 static inline void put_uts_ns(struct uts_namespace *ns)
@@ -59,16 +57,8 @@ static inline void put_uts_ns(struct uts
 	kref_put(&ns->kref, free_uts_ns);
 }
 #else
-static inline int unshare_utsname(unsigned long unshare_flags,
-			struct uts_namespace **new_uts)
-{
-	if (unshare_flags & CLONE_NEWUTS)
-		return -EINVAL;
-
-	return 0;
-}
-
-static inline int copy_utsname(int flags, struct task_struct *tsk)
+static inline int copy_utsname(int flags, struct uts_namespace *ns,
+				struct nsproxy *nsp)
 {
 	return 0;
 }
Index: linux-2.6.21-rc1/kernel/utsname.c
===================================================================
--- linux-2.6.21-rc1.orig/kernel/utsname.c	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/kernel/utsname.c	2007-02-26 10:27:42.000000000 -0800
@@ -32,32 +32,14 @@ static struct uts_namespace *clone_uts_n
 }
 
 /*
- * unshare the current process' utsname namespace.
- * called only in sys_unshare()
- */
-int unshare_utsname(unsigned long unshare_flags, struct uts_namespace **new_uts)
-{
-	if (unshare_flags & CLONE_NEWUTS) {
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
-
-		*new_uts = clone_uts_ns(current->nsproxy->uts_ns);
-		if (!*new_uts)
-			return -ENOMEM;
-	}
-
-	return 0;
-}
-
-/*
  * Copy task tsk's utsname namespace, or clone it if flags
  * specifies CLONE_NEWUTS.  In latter case, changes to the
  * utsname of this process won't be seen by parent, and vice
  * versa.
  */
-int copy_utsname(int flags, struct task_struct *tsk)
+int copy_utsname(int flags, struct uts_namespace *old_ns,
+	struct nsproxy *new_nsp)
 {
-	struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
 	struct uts_namespace *new_ns;
 	int err = 0;
 
@@ -79,7 +61,7 @@ int copy_utsname(int flags, struct task_
 		err = -ENOMEM;
 		goto out;
 	}
-	tsk->nsproxy->uts_ns = new_ns;
+	new_nsp->uts_ns = new_ns;
 
 out:
 	put_uts_ns(old_ns);
Index: linux-2.6.21-rc1/include/linux/ipc.h
===================================================================
--- linux-2.6.21-rc1.orig/include/linux/ipc.h	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/include/linux/ipc.h	2007-02-26 10:27:42.000000000 -0800
@@ -71,6 +71,7 @@ struct kern_ipc_perm
 };
 
 struct ipc_ids;
+struct nsproxy;
 struct ipc_namespace {
 	struct kref	kref;
 	struct ipc_ids	*ids[3];
@@ -98,10 +99,11 @@ extern struct ipc_namespace init_ipc_ns;
 
 #ifdef CONFIG_IPC_NS
 extern void free_ipc_ns(struct kref *kref);
-extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
-extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
+extern int copy_ipcs(unsigned long flags, struct ipc_namespace *ns,
+			struct nsproxy *new_nsp);
 #else
-static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+static inline int copy_ipcs(unsigned long flags, struct ipc_namespace *ns,
+			struct nsproxy *new_nsp)
 {
 	return 0;
 }
Index: linux-2.6.21-rc1/ipc/util.c
===================================================================
--- linux-2.6.21-rc1.orig/ipc/util.c	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/ipc/util.c	2007-02-26 10:27:42.000000000 -0800
@@ -85,27 +85,9 @@ err_mem:
 	return ERR_PTR(err);
 }
 
-int unshare_ipcs(unsigned long unshare_flags, struct ipc_namespace **new_ipc)
+int copy_ipcs(unsigned long flags, struct ipc_namespace *old_ns,
+		struct nsproxy *new_nsp)
 {
-	struct ipc_namespace *new;
-
-	if (unshare_flags & CLONE_NEWIPC) {
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
-
-		new = clone_ipc_ns(current->nsproxy->ipc_ns);
-		if (IS_ERR(new))
-			return PTR_ERR(new);
-
-		*new_ipc = new;
-	}
-
-	return 0;
-}
-
-int copy_ipcs(unsigned long flags, struct task_struct *tsk)
-{
-	struct ipc_namespace *old_ns = tsk->nsproxy->ipc_ns;
 	struct ipc_namespace *new_ns;
 	int err = 0;
 
@@ -128,7 +110,7 @@ int copy_ipcs(unsigned long flags, struc
 		goto out;
 	}
 
-	tsk->nsproxy->ipc_ns = new_ns;
+	new_nsp->ipc_ns = new_ns;
 out:
 	put_ipc_ns(old_ns);
 	return err;
Index: linux-2.6.21-rc1/include/linux/pid_namespace.h
===================================================================
--- linux-2.6.21-rc1.orig/include/linux/pid_namespace.h	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/include/linux/pid_namespace.h	2007-02-26 10:27:42.000000000 -0800
@@ -29,7 +29,8 @@ static inline void get_pid_ns(struct pid
 	kref_get(&ns->kref);
 }
 
-extern int copy_pid_ns(int flags, struct task_struct *tsk);
+extern int copy_pid_ns(int flags, struct pid_namespace *ns,
+		struct nsproxy *nsp);
 extern void free_pid_ns(struct kref *kref);
 
 static inline void put_pid_ns(struct pid_namespace *ns)
Index: linux-2.6.21-rc1/kernel/pid.c
===================================================================
--- linux-2.6.21-rc1.orig/kernel/pid.c	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/kernel/pid.c	2007-02-26 10:27:42.000000000 -0800
@@ -360,9 +360,9 @@ struct pid *find_ge_pid(int nr)
 }
 EXPORT_SYMBOL_GPL(find_get_pid);
 
-int copy_pid_ns(int flags, struct task_struct *tsk)
+int copy_pid_ns(int flags, struct pid_namespace *old_ns,
+	struct nsproxy *new_nsp)
 {
-	struct pid_namespace *old_ns = tsk->nsproxy->pid_ns;
 	int err = 0;
 
 	if (!old_ns)
Index: linux-2.6.21-rc1/include/linux/nsproxy.h
===================================================================
--- linux-2.6.21-rc1.orig/include/linux/nsproxy.h	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/include/linux/nsproxy.h	2007-02-26 10:27:42.000000000 -0800
@@ -35,6 +35,8 @@ struct nsproxy *dup_namespaces(struct ns
 int copy_namespaces(int flags, struct task_struct *tsk);
 void get_task_namespaces(struct task_struct *tsk);
 void free_nsproxy(struct nsproxy *ns);
+int unshare_nsproxy_namespaces(unsigned long, struct nsproxy **,
+	struct fs_struct *);
 
 static inline void put_nsproxy(struct nsproxy *ns)
 {
Index: linux-2.6.21-rc1/kernel/fork.c
===================================================================
--- linux-2.6.21-rc1.orig/kernel/fork.c	2007-02-20 20:32:30.000000000 -0800
+++ linux-2.6.21-rc1/kernel/fork.c	2007-02-26 10:27:42.000000000 -0800
@@ -1515,26 +1515,6 @@ static int unshare_fs(unsigned long unsh
 }
 
 /*
- * Unshare the mnt_namespace structure if it is being shared
- */
-static int unshare_mnt_namespace(unsigned long unshare_flags,
-		struct mnt_namespace **new_nsp, struct fs_struct *new_fs)
-{
-	struct mnt_namespace *ns = current->nsproxy->mnt_ns;
-
-	if ((unshare_flags & CLONE_NEWNS) && ns) {
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
-
-		*new_nsp = dup_mnt_ns(current, new_fs ? new_fs : current->fs);
-		if (!*new_nsp)
-			return -ENOMEM;
-	}
-
-	return 0;
-}
-
-/*
  * Unsharing of sighand is not supported yet
  */
 static int unshare_sighand(unsigned long unshare_flags, struct sighand_struct **new_sighp)
@@ -1592,16 +1572,6 @@ static int unshare_semundo(unsigned long
 	return 0;
 }
 
-#ifndef CONFIG_IPC_NS
-static inline int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
-{
-	if (flags & CLONE_NEWIPC)
-		return -EINVAL;
-
-	return 0;
-}
-#endif
-
 /*
  * unshare allows a process to 'unshare' part of the process
  * context which was originally shared using clone.  copy_*
@@ -1614,14 +1584,11 @@ asmlinkage long sys_unshare(unsigned lon
 {
 	int err = 0;
 	struct fs_struct *fs, *new_fs = NULL;
-	struct mnt_namespace *ns, *new_ns = NULL;
 	struct sighand_struct *new_sigh = NULL;
 	struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
 	struct files_struct *fd, *new_fd = NULL;
 	struct sem_undo_list *new_ulist = NULL;
 	struct nsproxy *new_nsproxy = NULL, *old_nsproxy = NULL;
-	struct uts_namespace *uts, *new_uts = NULL;
-	struct ipc_namespace *ipc, *new_ipc = NULL;
 
 	check_unshare_flags(&unshare_flags);
 
@@ -1636,36 +1603,24 @@ asmlinkage long sys_unshare(unsigned lon
 		goto bad_unshare_out;
 	if ((err = unshare_fs(unshare_flags, &new_fs)))
 		goto bad_unshare_cleanup_thread;
-	if ((err = unshare_mnt_namespace(unshare_flags, &new_ns, new_fs)))
-		goto bad_unshare_cleanup_fs;
 	if ((err = unshare_sighand(unshare_flags, &new_sigh)))
-		goto bad_unshare_cleanup_ns;
+		goto bad_unshare_cleanup_fs;
 	if ((err = unshare_vm(unshare_flags, &new_mm)))
 		goto bad_unshare_cleanup_sigh;
 	if ((err = unshare_fd(unshare_flags, &new_fd)))
 		goto bad_unshare_cleanup_vm;
 	if ((err = unshare_semundo(unshare_flags, &new_ulist)))
 		goto bad_unshare_cleanup_fd;
-	if ((err = unshare_utsname(unshare_flags, &new_uts)))
+	if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy,
+			new_fs)))
 		goto bad_unshare_cleanup_semundo;
-	if ((err = unshare_ipcs(unshare_flags, &new_ipc)))
-		goto bad_unshare_cleanup_uts;
 
-	if (new_ns || new_uts || new_ipc) {
-		old_nsproxy = current->nsproxy;
-		new_nsproxy = dup_namespaces(old_nsproxy);
-		if (!new_nsproxy) {
-			err = -ENOMEM;
-			goto bad_unshare_cleanup_ipc;
-		}
-	}
-
-	if (new_fs || new_ns || new_mm || new_fd || new_ulist ||
-				new_uts || new_ipc) {
+	if (new_fs ||  new_mm || new_fd || new_ulist || new_nsproxy) {
 
 		task_lock(current);
 
 		if (new_nsproxy) {
+			old_nsproxy = current->nsproxy;
 			current->nsproxy = new_nsproxy;
 			new_nsproxy = old_nsproxy;
 		}
@@ -1676,12 +1631,6 @@ asmlinkage long sys_unshare(unsigned lon
 			new_fs = fs;
 		}
 
-		if (new_ns) {
-			ns = current->nsproxy->mnt_ns;
-			current->nsproxy->mnt_ns = new_ns;
-			new_ns = ns;
-		}
-
 		if (new_mm) {
 			mm = current->mm;
 			active_mm = current->active_mm;
@@ -1697,32 +1646,12 @@ asmlinkage long sys_unshare(unsigned lon
 			new_fd = fd;
 		}
 
-		if (new_uts) {
-			uts = current->nsproxy->uts_ns;
-			current->nsproxy->uts_ns = new_uts;
-			new_uts = uts;
-		}
-
-		if (new_ipc) {
-			ipc = current->nsproxy->ipc_ns;
-			current->nsproxy->ipc_ns = new_ipc;
-			new_ipc = ipc;
-		}
-
 		task_unlock(current);
 	}
 
 	if (new_nsproxy)
 		put_nsproxy(new_nsproxy);
 
-bad_unshare_cleanup_ipc:
-	if (new_ipc)
-		put_ipc_ns(new_ipc);
-
-bad_unshare_cleanup_uts:
-	if (new_uts)
-		put_uts_ns(new_uts);
-
 bad_unshare_cleanup_semundo:
 bad_unshare_cleanup_fd:
 	if (new_fd)
@@ -1737,10 +1666,6 @@ bad_unshare_cleanup_sigh:
 		if (atomic_dec_and_test(&new_sigh->count))
 			kmem_cache_free(sighand_cachep, new_sigh);
 
-bad_unshare_cleanup_ns:
-	if (new_ns)
-		put_mnt_ns(new_ns);
-
 bad_unshare_cleanup_fs:
 	if (new_fs)
 		put_fs_struct(new_fs);


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