From: Miklos Szeredi Overlayfs needs a private clone of the mount, so create a function for this and export to modules. Signed-off-by: Miklos Szeredi --- fs/namespace.c | 17 +++++++++++++++++ include/linux/mount.h | 3 +++ 2 files changed, 20 insertions(+) Index: linux-2.6/fs/namespace.c =================================================================== --- linux-2.6.orig/fs/namespace.c 2011-03-01 12:17:47.000000000 +0100 +++ linux-2.6/fs/namespace.c 2011-03-01 12:18:18.000000000 +0100 @@ -1451,6 +1451,23 @@ void drop_collected_mounts(struct vfsmou release_mounts(&umount_list); } +struct vfsmount *clone_private_mount(struct path *path) +{ + struct vfsmount *mnt; + + if (IS_MNT_UNBINDABLE(path->mnt)) + return ERR_PTR(-EINVAL); + + down_read(&namespace_sem); + mnt = clone_mnt(path->mnt, path->dentry, CL_PRIVATE); + up_read(&namespace_sem); + if (!mnt) + return ERR_PTR(-ENOMEM); + + return mnt; +} +EXPORT_SYMBOL_GPL(clone_private_mount); + int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, struct vfsmount *root) { Index: linux-2.6/include/linux/mount.h =================================================================== --- linux-2.6.orig/include/linux/mount.h 2011-03-01 12:17:47.000000000 +0100 +++ linux-2.6/include/linux/mount.h 2011-03-01 12:18:18.000000000 +0100 @@ -100,6 +100,9 @@ extern void mnt_pin(struct vfsmount *mnt extern void mnt_unpin(struct vfsmount *mnt); extern int __mnt_is_readonly(struct vfsmount *mnt); +struct path; +extern struct vfsmount *clone_private_mount(struct path *path); + extern struct vfsmount *do_kern_mount(const char *fstype, int flags, const char *name, void *data); -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/