diff options
Diffstat (limited to 'lib/idr.c')
| -rw-r--r-- | lib/idr.c | 50 |
1 files changed, 31 insertions, 19 deletions
diff --git a/lib/idr.c b/lib/idr.c index 6415d053e2bf..d226259c3c28 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -6,20 +6,20 @@ * Modified by George Anzinger to reuse immediately and to use * find bit instructions. Also removed _irq on spinlocks. * - * Small id to pointer translation service. + * Small id to pointer translation service. * - * It uses a radix tree like structure as a sparse array indexed + * It uses a radix tree like structure as a sparse array indexed * by the id to obtain the pointer. The bitmap makes allocating - * a new id quick. + * a new id quick. * * You call it to allocate an id (an int) an associate with that id a * pointer or what ever, we treat it as a (void *). You can pass this * id to a user for him to pass back at a later time. You then pass * that id to this code and it returns your pointer. - * You can release ids at any time. When all ids are released, most of + * You can release ids at any time. When all ids are released, most of * the memory is returned (we keep IDR_FREE_MAX) in a local pool so we - * don't need to go to the memory "store" during an id allocate, just + * don't need to go to the memory "store" during an id allocate, just * so you don't need to be too concerned about locking and conflicts * with the slab allocator. */ @@ -72,12 +72,12 @@ static void free_layer(struct idr *idp, struct idr_layer *p) * If the system is REALLY out of memory this function returns 0, * otherwise 1. */ -int idr_pre_get(struct idr *idp, unsigned gfp_mask) +int idr_pre_get(struct idr *idp, gfp_t gfp_mask) { while (idp->id_free_cnt < IDR_FREE_MAX) { struct idr_layer *new; new = kmem_cache_alloc(idr_layer_cache, gfp_mask); - if(new == NULL) + if (new == NULL) return (0); free_layer(idp, new); } @@ -107,7 +107,7 @@ static int sub_alloc(struct idr *idp, void *ptr, int *starting_id) if (m == IDR_SIZE) { /* no space available go back to previous layer. */ l++; - id = (id | ((1 << (IDR_BITS*l))-1)) + 1; + id = (id | ((1 << (IDR_BITS * l)) - 1)) + 1; if (!(p = pa[l])) { *starting_id = id; return -2; @@ -161,7 +161,7 @@ static int idr_get_new_above_int(struct idr *idp, void *ptr, int starting_id) { struct idr_layer *p, *new; int layers, v, id; - + id = starting_id; build_up: p = idp->top; @@ -225,6 +225,7 @@ build_up: int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id) { int rv; + rv = idr_get_new_above_int(idp, ptr, starting_id); /* * This is a cheap hack until the IDR code can be fixed to @@ -259,6 +260,7 @@ EXPORT_SYMBOL(idr_get_new_above); int idr_get_new(struct idr *idp, void *ptr, int *id) { int rv; + rv = idr_get_new_above_int(idp, ptr, 0); /* * This is a cheap hack until the IDR code can be fixed to @@ -306,11 +308,10 @@ static void sub_remove(struct idr *idp, int shift, int id) free_layer(idp, **paa); **paa-- = NULL; } - if ( ! *paa ) + if (!*paa) idp->layers = 0; - } else { + } else idr_remove_warning(id); - } } /** @@ -326,9 +327,8 @@ void idr_remove(struct idr *idp, int id) id &= MAX_ID_MASK; sub_remove(idp, (idp->layers - 1) * IDR_BITS, id); - if ( idp->top && idp->top->count == 1 && - (idp->layers > 1) && - idp->top->ary[0]){ // We can drop a layer + if (idp->top && idp->top->count == 1 && (idp->layers > 1) && + idp->top->ary[0]) { // We can drop a layer p = idp->top->ary[0]; idp->top->bitmap = idp->top->count = 0; @@ -337,7 +337,6 @@ void idr_remove(struct idr *idp, int id) --idp->layers; } while (idp->id_free_cnt >= IDR_FREE_MAX) { - p = alloc_layer(idp); kmem_cache_free(idr_layer_cache, p); return; @@ -346,6 +345,19 @@ void idr_remove(struct idr *idp, int id) EXPORT_SYMBOL(idr_remove); /** + * idr_destroy - release all cached layers within an idr tree + * idp: idr handle + */ +void idr_destroy(struct idr *idp) +{ + while (idp->id_free_cnt) { + struct idr_layer *p = alloc_layer(idp); + kmem_cache_free(idr_layer_cache, p); + } +} +EXPORT_SYMBOL(idr_destroy); + +/** * idr_find - return pointer for given id * @idp: idr handle * @id: lookup key @@ -378,8 +390,8 @@ void *idr_find(struct idr *idp, int id) } EXPORT_SYMBOL(idr_find); -static void idr_cache_ctor(void * idr_layer, - kmem_cache_t *idr_layer_cache, unsigned long flags) +static void idr_cache_ctor(void * idr_layer, kmem_cache_t *idr_layer_cache, + unsigned long flags) { memset(idr_layer, 0, sizeof(struct idr_layer)); } @@ -387,7 +399,7 @@ static void idr_cache_ctor(void * idr_layer, static int init_id_cache(void) { if (!idr_layer_cache) - idr_layer_cache = kmem_cache_create("idr_layer_cache", + idr_layer_cache = kmem_cache_create("idr_layer_cache", sizeof(struct idr_layer), 0, 0, idr_cache_ctor, NULL); return 0; } |