| From | David Howells <> | Subject | [PATCH 08/73] VFS: Add CL_NO_SHARED flag to clone_mnt()/copy_tree() [ver #2] | Date | Tue, 21 Feb 2012 17:58:25 +0000 |
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From: Valerie Aurora <vaurora@redhat.com>
Passing the CL_NO_SHARED flag to clone_mnt() causes the clone to fail if the source mnt is shared.
Original-author: Valerie Aurora <vaurora@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Cc: Ram Pai <linuxram@us.ibm.com> ---
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 35c3b80..f92f574 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -740,6 +740,9 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root, struct mount *mnt; int err; + if ((flag & CL_NO_SHARED) && IS_MNT_SHARED(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 65c6097..c7089dd 100644 --- a/fs/pnode.h +++ b/fs/pnode.h @@ -22,6 +22,7 @@ #define CL_COPY_ALL 0x04 #define CL_MAKE_SHARED 0x08 #define CL_PRIVATE 0x10 +#define CL_NO_SHARED 0x20 static inline void set_mnt_shared(struct mount *mnt) {
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