vfsmount_lock in __d_path()

[Tetsuo Handa <from-kernelnewbies@xxxxxxxxxxxxxxxxxxx>]

Hello.

In the function __d_path() at http://lxr.linux.no/source/fs/dcache.c#L1354 ,
"vfsmnt->mnt_parent" "vfsmnt->mnt_mountpoint" "vfsmnt->mnt_parent"
are protected by spin_lock(&vfsmount_lock), while "vfsmnt->mnt_root" is not.

In the function do_move_mount() at http://lxr.linux.no/source/fs/namespace.c#L695 ,
"old_nd.mnt->mnt_root" is protected by spin_lock(&vfsmount_lock).

Is spin_lock(&vfsmount_lock) unnecessary for referring "vfsmnt->mnt_root" ?

Regards.

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