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Index: head/share/man/man9/Makefile
===================================================================
--- head/share/man/man9/Makefile
+++ head/share/man/man9/Makefile
@@ -414,6 +414,7 @@
MLINKS= unr.9 alloc_unr.9 \
unr.9 alloc_unrl.9 \
unr.9 alloc_unr_specific.9 \
+ unr.9 clear_unrhdr.9 \
unr.9 delete_unrhdr.9 \
unr.9 free_unr.9 \
unr.9 new_unrhdr.9
Index: head/share/man/man9/unr.9
===================================================================
--- head/share/man/man9/unr.9
+++ head/share/man/man9/unr.9
@@ -24,11 +24,12 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 5, 2010
+.Dd October 4, 2017
.Dt UNR 9
.Os
.Sh NAME
.Nm new_unrhdr ,
+.Nm clear_unrhdr ,
.Nm delete_unrhdr ,
.Nm alloc_unr ,
.Nm alloc_unr_specific ,
@@ -39,6 +40,8 @@
.Ft "struct unrhdr *"
.Fn new_unrhdr "int low" "int high" "struct mtx *mutex"
.Ft void
+.Fn clear_unrhdr "struct unrhdr *uh"
+.Ft void
.Fn delete_unrhdr "struct unrhdr *uh"
.Ft int
.Fn alloc_unr "struct unrhdr *uh"
@@ -70,8 +73,16 @@
.Dv NULL ,
it is used for locking when allocating and freeing units.
Otherwise, internal mutex is used.
+.It Fn clear_unrhdr uh
+Clear all units from the specified unit number allocator entity.
+This function resets the entity as if it were just initialized with
+.Fn new_unrhdr .
.It Fn delete_unrhdr uh
-Destroy specified unit number allocator entity.
+Delete specified unit number allocator entity.
+This function frees the memory associated with the entity, it does not free
+any units.
+To free all units use
+.Fn clear_unrhdr .
.It Fn alloc_unr uh
Return a new unit number.
The lowest free number is always allocated.
Index: head/sys/kern/subr_unit.c
===================================================================
--- head/sys/kern/subr_unit.c
+++ head/sys/kern/subr_unit.c
@@ -366,6 +366,27 @@
Free(uh);
}
+void
+clear_unrhdr(struct unrhdr *uh)
+{
+ struct unr *up, *uq;
+
+ KASSERT(TAILQ_EMPTY(&uh->ppfree),
+ ("unrhdr has postponed item for free"));
+ up = TAILQ_FIRST(&uh->head);
+ while (up != NULL) {
+ uq = TAILQ_NEXT(up, list);
+ if (up->ptr != uh) {
+ Free(up->ptr);
+ }
+ Free(up);
+ up = uq;
+ }
+ TAILQ_INIT(&uh->head);
+ uh->busy = 0;
+ uh->alloc = 0;
+}
+
static __inline int
is_bitmap(struct unrhdr *uh, struct unr *up)
{
Index: head/sys/sys/systm.h
===================================================================
--- head/sys/sys/systm.h
+++ head/sys/sys/systm.h
@@ -450,6 +450,7 @@
struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
void delete_unrhdr(struct unrhdr *uh);
+void clear_unrhdr(struct unrhdr *uh);
void clean_unrhdr(struct unrhdr *uh);
void clean_unrhdrl(struct unrhdr *uh);
int alloc_unr(struct unrhdr *uh);

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