[PATCH 04/76] VFS: Add CL_NO_SLAVE flag to clone_mnt()/copy_tree()
From: David Howells <dhowells@redhat.com>
Date: 2011-06-17 16:00:49
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
From: Valerie Aurora <redacted> Passing the CL_NO_SLAVE flag to clone_mnt() causes the clone to fail if the source mnt is a slave. Cc: Ram Pai <redacted> --- fs/namespace.c | 3 +++ fs/pnode.h | 1 + 2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index c10394d..a9e5e06 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c@@ -710,6 +710,9 @@ static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root, if ((flag & CL_NO_SHARED) && IS_MNT_SHARED(old)) return ERR_PTR(-EINVAL); + if ((flag & CL_NO_SLAVE) && IS_MNT_SLAVE(old)) + return ERR_PTR(-EINVAL); + mnt = alloc_vfsmnt(old->mnt_devname); if (!mnt) return ERR_PTR(-ENOMEM);
diff --git a/fs/pnode.h b/fs/pnode.h
index bcb3c47..8920e47 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h@@ -23,6 +23,7 @@ #define CL_MAKE_SHARED 0x08 #define CL_PRIVATE 0x10 #define CL_NO_SHARED 0x20 +#define CL_NO_SLAVE 0x40 static inline void set_mnt_shared(struct vfsmount *mnt) {