44 #include <sys/vnode.h>
54  * Each cache entry holds a reference to the lower vnode
55  * along with a pointer to the alias vnode.  When an
56  * entry is added the lower vnode is VREF'd.  When the
57  * alias is removed the lower vnode is vrele'd.
99  * Return a VREF'ed alias for lower vnode if already exists, else 0.
100  * Lower vnode should be locked on entry and will be left locked on exit.
102 static struct vnode *
103 null_hashget_locked(struct mount *mp, struct vnode *lowervp)  in null_hashget_locked()
107 	struct vnode *vp;  in null_hashget_locked()
115 	 * the lower vnode.  If found, the increment the null_node  in null_hashget_locked()
116 	 * reference count (but NOT the lower vnode's VREF counter).  in null_hashget_locked()
138 struct vnode *
139 null_hashget(struct mount *mp, struct vnode *lowervp)  in null_hashget()
143 	struct vnode *vp;  in null_hashget()
155 		 * See null_hashget_locked as to why the nullfs vnode can't be  in null_hashget()
188 			    ("vnode already in hash"));  in null_hashins()
196 null_destroy_proto(struct vnode *vp, void *xp)  in null_destroy_proto()
212  * Vp is the alias vnode, lowervp is the lower vnode.
216  * the caller's "spare" reference to created nullfs vnode.
219 null_nodeget(struct mount *mp, struct vnode *lowervp, struct vnode **vpp)  in null_nodeget()
222 	struct vnode *vp;  in null_nodeget()
236 	 * We do not serialize vnode creation, instead we will check for  in null_nodeget()
237 	 * duplicates later, when adding new vnode to hash.  in null_nodeget()
271 	 * We might miss the case where lower vnode sets VIRF_PGREAD  in null_nodeget()
320 struct vnode *
321 null_checkvp(struct vnode *vp, char *fil, int lno)  in null_checkvp()