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UBUNTU: ubuntu: overlayfs -- vfs: introduce clone_private_mount()

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Overlayfs needs a private clone of the mount, so create a function for
this and export to modules.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
This commit is contained in:
Miklos Szeredi
2012-08-30 16:13:49 +02:00
committed by Tim Gardner
parent 564a3c863e
commit 246239e5ec
2 changed files with 21 additions and 0 deletions
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18
fs/namespace.c
View File

@@ -1421,6 +1421,24 @@ void drop_collected_mounts(struct vfsmount *mnt)
release_mounts(&umount_list);
}
struct vfsmount *clone_private_mount(struct path *path)
{
struct mount *old_mnt = real_mount(path->mnt);
struct mount *new_mnt;
if (IS_MNT_UNBINDABLE(old_mnt))
return ERR_PTR(-EINVAL);
down_read(&namespace_sem);
new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);
up_read(&namespace_sem);
if (!new_mnt)
return ERR_PTR(-ENOMEM);
return &new_mnt->mnt;
}
EXPORT_SYMBOL_GPL(clone_private_mount);
int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
struct vfsmount *root)
{

3
include/linux/mount.h
View File

@@ -68,6 +68,9 @@ 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);
struct file_system_type;
extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
int flags, const char *name,