diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2012-05-14 13:06:13 +0200 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-06-21 05:16:42 -0600 |
| commit | b6d3f92c1a9cb0ea1c3585ba6731ef0c2f5fca41 (patch) | |
| tree | c3e940c6e0e751ce213030c41f98b351df54f3ac /fs | |
| parent | 5b56a3999f1314c860d9de3cd57d9bd06051be1d (diff) | |
UBUNTU: ubuntu: overlayfs -- vfs: introduce clone_private_mount()
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/namespace.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 7db5f2b1527..6731fc258b3 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1327,6 +1327,24 @@ 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) { |