diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2011-06-01 10:57:14 +0200 |
|---|---|---|
| committer | Linaro CI <john.rigby@linaro.org> | 2011-12-15 23:34:19 +0000 |
| commit | 85fb6b910df2d8dacfb07dba8c98e3151a70be57 (patch) | |
| tree | c095e86e016115baf20bcc4aebdb9914f656110e /fs | |
| parent | 7bda80ff41b85f152196e3bb0be695d1c27801af (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>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/namespace.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 344999bccca..7cff66db2bb 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1495,6 +1495,23 @@ void drop_collected_mounts(struct vfsmount *mnt) 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) { |