Re: [PATCH 09/73] VFS: Add CL_NO_SLAVE flag to clone_mnt()/copy_tree() [ver #2]
From: Ram Pai <hidden>
Date: 2012-02-29 06:58:08
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On Tue, Feb 21, 2012 at 05:58:32PM +0000, David Howells wrote:
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. Original-author: Valerie Aurora [off-list ref] Signed-off-by: David Howells <dhowells@redhat.com> Cc: Ram Pai <redacted>
Reviewed-by: Ram Pai <redacted>
quoted hunk ↗ jump to hunk
--- 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 f92f574..96f43f2 100644 --- a/fs/namespace.c +++ b/fs/namespace.c@@ -743,6 +743,9 @@ static struct mount *clone_mnt(struct mount *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 c7089dd..f7ae149 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 mount *mnt) {