Add clearing function for unr(9).
Previously before you could call unrhdr_delete you needed to individually free every allocated unit. It is useful to be able to tear down the unr without having to go through this process, as it is significantly faster than freeing the individual units. Reviewed by: cem, lidl Approved by: rstone (mentor) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D12591
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=324541
@ -414,6 +414,7 @@ MAN= accept_filter.9 \
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MLINKS= unr.9 alloc_unr.9 \
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MLINKS= unr.9 alloc_unr.9 \
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unr.9 alloc_unrl.9 \
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unr.9 alloc_unrl.9 \
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unr.9 alloc_unr_specific.9 \
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unr.9 alloc_unr_specific.9 \
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unr.9 clear_unrhdr.9 \
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unr.9 delete_unrhdr.9 \
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unr.9 delete_unrhdr.9 \
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unr.9 free_unr.9 \
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unr.9 free_unr.9 \
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unr.9 new_unrhdr.9
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unr.9 new_unrhdr.9
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@ -24,11 +24,12 @@
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.\"
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.\"
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.\" $FreeBSD$
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.\" $FreeBSD$
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.\"
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.\"
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.Dd July 5, 2010
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.Dd October 4, 2017
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.Dt UNR 9
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.Dt UNR 9
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.Os
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.Os
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.Sh NAME
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.Sh NAME
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.Nm new_unrhdr ,
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.Nm new_unrhdr ,
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.Nm clear_unrhdr ,
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.Nm delete_unrhdr ,
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.Nm delete_unrhdr ,
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.Nm alloc_unr ,
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.Nm alloc_unr ,
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.Nm alloc_unr_specific ,
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.Nm alloc_unr_specific ,
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@ -39,6 +40,8 @@
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.Ft "struct unrhdr *"
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.Ft "struct unrhdr *"
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.Fn new_unrhdr "int low" "int high" "struct mtx *mutex"
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.Fn new_unrhdr "int low" "int high" "struct mtx *mutex"
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.Ft void
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.Ft void
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.Fn clear_unrhdr "struct unrhdr *uh"
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.Ft void
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.Fn delete_unrhdr "struct unrhdr *uh"
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.Fn delete_unrhdr "struct unrhdr *uh"
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.Ft int
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.Ft int
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.Fn alloc_unr "struct unrhdr *uh"
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.Fn alloc_unr "struct unrhdr *uh"
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@ -70,8 +73,16 @@ is not
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.Dv NULL ,
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.Dv NULL ,
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it is used for locking when allocating and freeing units.
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it is used for locking when allocating and freeing units.
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Otherwise, internal mutex is used.
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Otherwise, internal mutex is used.
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.It Fn clear_unrhdr uh
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Clear all units from the specified unit number allocator entity.
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This function resets the entity as if it were just initialized with
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.Fn new_unrhdr .
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.It Fn delete_unrhdr uh
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.It Fn delete_unrhdr uh
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Destroy specified unit number allocator entity.
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Delete specified unit number allocator entity.
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This function frees the memory associated with the entity, it does not free
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any units.
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To free all units use
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.Fn clear_unrhdr .
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.It Fn alloc_unr uh
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.It Fn alloc_unr uh
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Return a new unit number.
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Return a new unit number.
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The lowest free number is always allocated.
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The lowest free number is always allocated.
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@ -366,6 +366,27 @@ delete_unrhdr(struct unrhdr *uh)
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Free(uh);
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Free(uh);
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}
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}
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void
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clear_unrhdr(struct unrhdr *uh)
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{
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struct unr *up, *uq;
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KASSERT(TAILQ_EMPTY(&uh->ppfree),
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("unrhdr has postponed item for free"));
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up = TAILQ_FIRST(&uh->head);
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while (up != NULL) {
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uq = TAILQ_NEXT(up, list);
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if (up->ptr != uh) {
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Free(up->ptr);
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}
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Free(up);
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up = uq;
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}
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TAILQ_INIT(&uh->head);
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uh->busy = 0;
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uh->alloc = 0;
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}
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static __inline int
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static __inline int
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is_bitmap(struct unrhdr *uh, struct unr *up)
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is_bitmap(struct unrhdr *uh, struct unr *up)
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{
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{
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@ -450,6 +450,7 @@ struct unrhdr;
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struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
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struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
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void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
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void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
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void delete_unrhdr(struct unrhdr *uh);
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void delete_unrhdr(struct unrhdr *uh);
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void clear_unrhdr(struct unrhdr *uh);
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void clean_unrhdr(struct unrhdr *uh);
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void clean_unrhdr(struct unrhdr *uh);
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void clean_unrhdrl(struct unrhdr *uh);
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void clean_unrhdrl(struct unrhdr *uh);
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int alloc_unr(struct unrhdr *uh);
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int alloc_unr(struct unrhdr *uh);
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