From 23936cc0b5d89619c34c2dab11d8cf3d6f7ca028 Mon Sep 17 00:00:00 2001 From: Kristian Hoegsberg Date: Sun, 15 Jul 2007 23:37:24 -0700 Subject: lib: add idr_remove_all Remove all ids from the given idr tree. idr_destroy() only frees up unused, cached idp_layers, but this function will remove all id mappings and leave all idp_layers unused. A typical clean-up sequence for objects stored in an idr tree, will use idr_for_each() to free all objects, if necessay, then idr_remove_all() to remove all ids, and idr_destroy() to free up the cached idr_layers. Signed-off-by: Kristian Hoegsberg Cc: Tejun Heo Cc: Dave Airlie Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/idr.h | 1 + lib/idr.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+) diff --git a/include/linux/idr.h b/include/linux/idr.h index 8442c0bffc06..0edda411959c 100644 --- a/include/linux/idr.h +++ b/include/linux/idr.h @@ -82,6 +82,7 @@ int idr_for_each(struct idr *idp, int (*fn)(int id, void *p, void *data), void *data); void *idr_replace(struct idr *idp, void *ptr, int id); void idr_remove(struct idr *idp, int id); +void idr_remove_all(struct idr *idp); void idr_destroy(struct idr *idp); void idr_init(struct idr *idp); diff --git a/lib/idr.c b/lib/idr.c index d29da6159dae..5ca67b3cfd35 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -390,6 +390,53 @@ void idr_remove(struct idr *idp, int id) } EXPORT_SYMBOL(idr_remove); +/** + * idr_remove_all - remove all ids from the given idr tree + * @idp: idr handle + * + * idr_destroy() only frees up unused, cached idp_layers, but this + * function will remove all id mappings and leave all idp_layers + * unused. + * + * A typical clean-up sequence for objects stored in an idr tree, will + * use idr_for_each() to free all objects, if necessay, then + * idr_remove_all() to remove all ids, and idr_destroy() to free + * up the cached idr_layers. + */ +void idr_remove_all(struct idr *idp) +{ + int n, id, max, error = 0; + struct idr_layer *p; + struct idr_layer *pa[MAX_LEVEL]; + struct idr_layer **paa = &pa[0]; + + n = idp->layers * IDR_BITS; + p = idp->top; + max = 1 << n; + + id = 0; + while (id < max && !error) { + while (n > IDR_BITS && p) { + n -= IDR_BITS; + *paa++ = p; + p = p->ary[(id >> n) & IDR_MASK]; + } + + id += 1 << n; + while (n < fls(id)) { + if (p) { + memset(p, 0, sizeof *p); + free_layer(idp, p); + } + n += IDR_BITS; + p = *--paa; + } + } + idp->top = NULL; + idp->layers = 0; +} +EXPORT_SYMBOL(idr_remove_all); + /** * idr_destroy - release all cached layers within an idr tree * idp: idr handle -- cgit v1.2.3