basic FSH

*** 196,205 ****
--- 196,206 ----
   * option requires grabbing the vfs list write lock, which can be a very
   * high latency lock.
   */
  struct zone;            /* from zone.h */
  struct fem_head;        /* from fem.h */
+ struct fsh_fsrecord;    /* from fsh_impl.h */
  
  typedef struct vfs {
          struct vfs      *vfs_next;              /* next VFS in VFS list */
          struct vfs      *vfs_prev;              /* prev VFS in VFS list */
  
*** 233,242 ****
--- 234,246 ----
          struct vfs      *vfs_zone_next;         /* next VFS visible in zone */
          struct vfs      *vfs_zone_prev;         /* prev VFS visible in zone */
  
          struct fem_head *vfs_femhead;           /* fs monitoring */
          minor_t         vfs_lofi_minor;         /* minor if lofi mount */
+ 
+         struct fsh_fsrecord *volatile
+                 vfs_fshrecord;                  /* fs hooking */
  } vfs_t;
  
  #define vfs_featureset  vfs_implp->vi_featureset
  #define vfs_vskap       vfs_implp->vi_vskap
  #define vfs_fstypevsp   vfs_implp->vi_fstypevsp