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lib/radix-tree.c
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/* * Copyright (C) 2001 Momchil Velikov * Portions Copyright (C) 2001 Christoph Hellwig |
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* Copyright (C) 2005 SGI, Christoph Lameter |
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* Copyright (C) 2006 Nick Piggin |
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* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/radix-tree.h> #include <linux/percpu.h> #include <linux/slab.h> #include <linux/notifier.h> #include <linux/cpu.h> |
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#include <linux/string.h> #include <linux/bitops.h> |
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#include <linux/rcupdate.h> |
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#ifdef __KERNEL__ |
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#define RADIX_TREE_MAP_SHIFT (CONFIG_BASE_SMALL ? 4 : 6) |
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#else #define RADIX_TREE_MAP_SHIFT 3 /* For more stressful testing */ #endif |
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#define RADIX_TREE_MAP_SIZE (1UL << RADIX_TREE_MAP_SHIFT) #define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE-1) #define RADIX_TREE_TAG_LONGS \ ((RADIX_TREE_MAP_SIZE + BITS_PER_LONG - 1) / BITS_PER_LONG) struct radix_tree_node { |
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unsigned int height; /* Height from the bottom */ |
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unsigned int count; |
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union { struct radix_tree_node *parent; /* Used when ascending tree */ struct rcu_head rcu_head; /* Used when freeing node */ }; |
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void __rcu *slots[RADIX_TREE_MAP_SIZE]; |
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unsigned long tags[RADIX_TREE_MAX_TAGS][RADIX_TREE_TAG_LONGS]; |
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}; |
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#define RADIX_TREE_INDEX_BITS (8 /* CHAR_BIT */ * sizeof(unsigned long)) |
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#define RADIX_TREE_MAX_PATH (DIV_ROUND_UP(RADIX_TREE_INDEX_BITS, \ RADIX_TREE_MAP_SHIFT)) |
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|
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/* * The height_to_maxindex array needs to be one deeper than the maximum * path as height 0 holds only 1 entry. */ static unsigned long height_to_maxindex[RADIX_TREE_MAX_PATH + 1] __read_mostly; |
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/* * Radix tree node cache. */ |
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static struct kmem_cache *radix_tree_node_cachep; |
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/* * Per-cpu pool of preloaded nodes */ struct radix_tree_preload { int nr; struct radix_tree_node *nodes[RADIX_TREE_MAX_PATH]; }; |
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static DEFINE_PER_CPU(struct radix_tree_preload, radix_tree_preloads) = { 0, }; |
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|
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static inline void *ptr_to_indirect(void *ptr) { return (void *)((unsigned long)ptr | RADIX_TREE_INDIRECT_PTR); } static inline void *indirect_to_ptr(void *ptr) { return (void *)((unsigned long)ptr & ~RADIX_TREE_INDIRECT_PTR); } |
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static inline gfp_t root_gfp_mask(struct radix_tree_root *root) { return root->gfp_mask & __GFP_BITS_MASK; } |
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static inline void tag_set(struct radix_tree_node *node, unsigned int tag, int offset) { __set_bit(offset, node->tags[tag]); } static inline void tag_clear(struct radix_tree_node *node, unsigned int tag, int offset) { __clear_bit(offset, node->tags[tag]); } static inline int tag_get(struct radix_tree_node *node, unsigned int tag, int offset) { return test_bit(offset, node->tags[tag]); } static inline void root_tag_set(struct radix_tree_root *root, unsigned int tag) { root->gfp_mask |= (__force gfp_t)(1 << (tag + __GFP_BITS_SHIFT)); } static inline void root_tag_clear(struct radix_tree_root *root, unsigned int tag) { root->gfp_mask &= (__force gfp_t)~(1 << (tag + __GFP_BITS_SHIFT)); } static inline void root_tag_clear_all(struct radix_tree_root *root) { root->gfp_mask &= __GFP_BITS_MASK; } static inline int root_tag_get(struct radix_tree_root *root, unsigned int tag) { return (__force unsigned)root->gfp_mask & (1 << (tag + __GFP_BITS_SHIFT)); } /* * Returns 1 if any slot in the node has this tag set. * Otherwise returns 0. */ static inline int any_tag_set(struct radix_tree_node *node, unsigned int tag) { int idx; for (idx = 0; idx < RADIX_TREE_TAG_LONGS; idx++) { if (node->tags[tag][idx]) return 1; } return 0; } |
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/* * This assumes that the caller has performed appropriate preallocation, and * that the caller has pinned this thread of control to the current CPU. */ static struct radix_tree_node * radix_tree_node_alloc(struct radix_tree_root *root) { |
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struct radix_tree_node *ret = NULL; |
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gfp_t gfp_mask = root_gfp_mask(root); |
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|
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if (!(gfp_mask & __GFP_WAIT)) { |
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struct radix_tree_preload *rtp; |
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/* * Provided the caller has preloaded here, we will always * succeed in getting a node here (and never reach * kmem_cache_alloc) */ |
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rtp = &__get_cpu_var(radix_tree_preloads); if (rtp->nr) { ret = rtp->nodes[rtp->nr - 1]; rtp->nodes[rtp->nr - 1] = NULL; rtp->nr--; } } |
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if (ret == NULL) |
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ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask); |
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|
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BUG_ON(radix_tree_is_indirect_ptr(ret)); |
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return ret; } |
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static void radix_tree_node_rcu_free(struct rcu_head *head) { struct radix_tree_node *node = container_of(head, struct radix_tree_node, rcu_head); |
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int i; |
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/* * must only free zeroed nodes into the slab. radix_tree_shrink * can leave us with a non-NULL entry in the first slot, so clear * that here to make sure. */ |
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for (i = 0; i < RADIX_TREE_MAX_TAGS; i++) tag_clear(node, i, 0); |
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node->slots[0] = NULL; node->count = 0; |
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kmem_cache_free(radix_tree_node_cachep, node); } |
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static inline void radix_tree_node_free(struct radix_tree_node *node) { |
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call_rcu(&node->rcu_head, radix_tree_node_rcu_free); |
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} /* * Load up this CPU's radix_tree_node buffer with sufficient objects to * ensure that the addition of a single element in the tree cannot fail. On * success, return zero, with preemption disabled. On error, return -ENOMEM * with preemption not disabled. |
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* * To make use of this facility, the radix tree must be initialised without * __GFP_WAIT being passed to INIT_RADIX_TREE(). |
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*/ |
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int radix_tree_preload(gfp_t gfp_mask) |
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{ struct radix_tree_preload *rtp; struct radix_tree_node *node; int ret = -ENOMEM; preempt_disable(); rtp = &__get_cpu_var(radix_tree_preloads); while (rtp->nr < ARRAY_SIZE(rtp->nodes)) { preempt_enable(); |
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node = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask); |
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if (node == NULL) goto out; preempt_disable(); rtp = &__get_cpu_var(radix_tree_preloads); if (rtp->nr < ARRAY_SIZE(rtp->nodes)) rtp->nodes[rtp->nr++] = node; else kmem_cache_free(radix_tree_node_cachep, node); } ret = 0; out: return ret; } |
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EXPORT_SYMBOL(radix_tree_preload); |
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|
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/* |
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* Return the maximum key which can be store into a * radix tree with height HEIGHT. */ static inline unsigned long radix_tree_maxindex(unsigned int height) { return height_to_maxindex[height]; } /* * Extend a radix tree so it can store key @index. */ static int radix_tree_extend(struct radix_tree_root *root, unsigned long index) { struct radix_tree_node *node; |
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struct radix_tree_node *slot; |
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unsigned int height; |
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int tag; /* Figure out what the height should be. */ height = root->height + 1; while (index > radix_tree_maxindex(height)) height++; if (root->rnode == NULL) { root->height = height; goto out; } |
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do { |
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unsigned int newheight; |
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if (!(node = radix_tree_node_alloc(root))) return -ENOMEM; |
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/* Propagate the aggregated tag info into the new root */ |
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for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) { |
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if (root_tag_get(root, tag)) |
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tag_set(node, tag, 0); } |
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/* Increase the height. */ |
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newheight = root->height+1; node->height = newheight; |
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node->count = 1; |
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node->parent = NULL; slot = root->rnode; if (newheight > 1) { slot = indirect_to_ptr(slot); slot->parent = node; } node->slots[0] = slot; |
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node = ptr_to_indirect(node); |
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rcu_assign_pointer(root->rnode, node); root->height = newheight; |
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} while (height > root->height); out: return 0; } /** * radix_tree_insert - insert into a radix tree * @root: radix tree root * @index: index key * @item: item to insert * * Insert an item into the radix tree at position @index. */ int radix_tree_insert(struct radix_tree_root *root, unsigned long index, void *item) { |
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struct radix_tree_node *node = NULL, *slot; |
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unsigned int height, shift; int offset; int error; |
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BUG_ON(radix_tree_is_indirect_ptr(item)); |
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|
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/* Make sure the tree is high enough. */ |
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if (index > radix_tree_maxindex(root->height)) { |
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error = radix_tree_extend(root, index); if (error) return error; } |
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slot = indirect_to_ptr(root->rnode); |
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|
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height = root->height; shift = (height-1) * RADIX_TREE_MAP_SHIFT; offset = 0; /* uninitialised var warning */ |
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while (height > 0) { |
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if (slot == NULL) { |
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/* Have to add a child node. */ |
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if (!(slot = radix_tree_node_alloc(root))) |
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return -ENOMEM; |
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slot->height = height; |
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slot->parent = node; |
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if (node) { |
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rcu_assign_pointer(node->slots[offset], slot); |
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node->count++; |
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} else |
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rcu_assign_pointer(root->rnode, ptr_to_indirect(slot)); |
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} /* Go a level down */ offset = (index >> shift) & RADIX_TREE_MAP_MASK; |
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node = slot; slot = node->slots[offset]; |
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shift -= RADIX_TREE_MAP_SHIFT; height--; |
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} |
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|
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if (slot != NULL) |
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return -EEXIST; |
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|
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if (node) { node->count++; |
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rcu_assign_pointer(node->slots[offset], item); |
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BUG_ON(tag_get(node, 0, offset)); BUG_ON(tag_get(node, 1, offset)); } else { |
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rcu_assign_pointer(root->rnode, item); |
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BUG_ON(root_tag_get(root, 0)); BUG_ON(root_tag_get(root, 1)); } |
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return 0; } EXPORT_SYMBOL(radix_tree_insert); |
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/* * is_slot == 1 : search for the slot. * is_slot == 0 : search for the node. |
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*/ |
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static void *radix_tree_lookup_element(struct radix_tree_root *root, unsigned long index, int is_slot) |
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{ unsigned int height, shift; |
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struct radix_tree_node *node, **slot; |
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|
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node = rcu_dereference_raw(root->rnode); |
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if (node == NULL) |
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return NULL; |
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if (!radix_tree_is_indirect_ptr(node)) { |
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if (index > 0) return NULL; |
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return is_slot ? (void *)&root->rnode : node; |
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} |
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node = indirect_to_ptr(node); |
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height = node->height; if (index > radix_tree_maxindex(height)) return NULL; |
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|
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shift = (height-1) * RADIX_TREE_MAP_SHIFT; |
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do { slot = (struct radix_tree_node **) (node->slots + ((index>>shift) & RADIX_TREE_MAP_MASK)); |
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node = rcu_dereference_raw(*slot); |
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if (node == NULL) |
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return NULL; |
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shift -= RADIX_TREE_MAP_SHIFT; height--; |
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} while (height > 0); |
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|
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return is_slot ? (void *)slot : indirect_to_ptr(node); |
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} /** * radix_tree_lookup_slot - lookup a slot in a radix tree * @root: radix tree root * @index: index key * * Returns: the slot corresponding to the position @index in the * radix tree @root. This is useful for update-if-exists operations. * * This function can be called under rcu_read_lock iff the slot is not * modified by radix_tree_replace_slot, otherwise it must be called * exclusive from other writers. Any dereference of the slot must be done * using radix_tree_deref_slot. */ void **radix_tree_lookup_slot(struct radix_tree_root *root, unsigned long index) { return (void **)radix_tree_lookup_element(root, index, 1); |
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} |
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EXPORT_SYMBOL(radix_tree_lookup_slot); /** * radix_tree_lookup - perform lookup operation on a radix tree * @root: radix tree root * @index: index key * * Lookup the item at the position @index in the radix tree @root. |
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* * This function can be called under rcu_read_lock, however the caller * must manage lifetimes of leaf nodes (eg. RCU may also be used to free * them safely). No RCU barriers are required to access or modify the * returned item, however. |
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*/ void *radix_tree_lookup(struct radix_tree_root *root, unsigned long index) { |
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return radix_tree_lookup_element(root, index, 0); |
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} EXPORT_SYMBOL(radix_tree_lookup); /** * radix_tree_tag_set - set a tag on a radix tree node * @root: radix tree root * @index: index key * @tag: tag index * |
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* Set the search tag (which must be < RADIX_TREE_MAX_TAGS) * corresponding to @index in the radix tree. From |
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* the root all the way down to the leaf node. * * Returns the address of the tagged item. Setting a tag on a not-present * item is a bug. */ void *radix_tree_tag_set(struct radix_tree_root *root, |
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unsigned long index, unsigned int tag) |
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{ unsigned int height, shift; |
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struct radix_tree_node *slot; |
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height = root->height; |
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BUG_ON(index > radix_tree_maxindex(height)); |
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|
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slot = indirect_to_ptr(root->rnode); |
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shift = (height - 1) * RADIX_TREE_MAP_SHIFT; |
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while (height > 0) { int offset; offset = (index >> shift) & RADIX_TREE_MAP_MASK; |
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if (!tag_get(slot, tag, offset)) tag_set(slot, tag, offset); |
201b6264f [PATCH] radix-tre... |
465 466 |
slot = slot->slots[offset]; BUG_ON(slot == NULL); |
1da177e4c Linux-2.6.12-rc2 |
467 468 469 |
shift -= RADIX_TREE_MAP_SHIFT; height--; } |
612d6c19d [PATCH] radix-tre... |
470 471 472 |
/* set the root's tag bit */ if (slot && !root_tag_get(root, tag)) root_tag_set(root, tag); |
201b6264f [PATCH] radix-tre... |
473 |
return slot; |
1da177e4c Linux-2.6.12-rc2 |
474 475 476 477 478 479 480 481 482 |
} EXPORT_SYMBOL(radix_tree_tag_set); /** * radix_tree_tag_clear - clear a tag on a radix tree node * @root: radix tree root * @index: index key * @tag: tag index * |
daff89f32 [PATCH] radix-tre... |
483 484 |
* Clear the search tag (which must be < RADIX_TREE_MAX_TAGS) * corresponding to @index in the radix tree. If |
1da177e4c Linux-2.6.12-rc2 |
485 486 487 488 489 490 491 |
* this causes the leaf node to have no tags set then clear the tag in the * next-to-leaf node, etc. * * Returns the address of the tagged item on success, else NULL. ie: * has the same return value and semantics as radix_tree_lookup(). */ void *radix_tree_tag_clear(struct radix_tree_root *root, |
daff89f32 [PATCH] radix-tre... |
492 |
unsigned long index, unsigned int tag) |
1da177e4c Linux-2.6.12-rc2 |
493 |
{ |
e2bdb933a radix_tree: take ... |
494 |
struct radix_tree_node *node = NULL; |
612d6c19d [PATCH] radix-tre... |
495 |
struct radix_tree_node *slot = NULL; |
1da177e4c Linux-2.6.12-rc2 |
496 |
unsigned int height, shift; |
e2bdb933a radix_tree: take ... |
497 |
int uninitialized_var(offset); |
1da177e4c Linux-2.6.12-rc2 |
498 499 500 501 |
height = root->height; if (index > radix_tree_maxindex(height)) goto out; |
e2bdb933a radix_tree: take ... |
502 |
shift = height * RADIX_TREE_MAP_SHIFT; |
27d20fddc radix-tree: fix R... |
503 |
slot = indirect_to_ptr(root->rnode); |
1da177e4c Linux-2.6.12-rc2 |
504 |
|
e2bdb933a radix_tree: take ... |
505 |
while (shift) { |
201b6264f [PATCH] radix-tre... |
506 |
if (slot == NULL) |
1da177e4c Linux-2.6.12-rc2 |
507 |
goto out; |
e2bdb933a radix_tree: take ... |
508 |
shift -= RADIX_TREE_MAP_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
509 |
offset = (index >> shift) & RADIX_TREE_MAP_MASK; |
e2bdb933a radix_tree: take ... |
510 |
node = slot; |
201b6264f [PATCH] radix-tre... |
511 |
slot = slot->slots[offset]; |
1da177e4c Linux-2.6.12-rc2 |
512 |
} |
612d6c19d [PATCH] radix-tre... |
513 |
if (slot == NULL) |
1da177e4c Linux-2.6.12-rc2 |
514 |
goto out; |
e2bdb933a radix_tree: take ... |
515 516 |
while (node) { if (!tag_get(node, tag, offset)) |
d5274261e [PATCH] radix tre... |
517 |
goto out; |
e2bdb933a radix_tree: take ... |
518 519 |
tag_clear(node, tag, offset); if (any_tag_set(node, tag)) |
6e954b9e9 [PATCH] radix tre... |
520 |
goto out; |
e2bdb933a radix_tree: take ... |
521 522 523 524 |
index >>= RADIX_TREE_MAP_SHIFT; offset = index & RADIX_TREE_MAP_MASK; node = node->parent; |
612d6c19d [PATCH] radix-tre... |
525 526 527 528 529 |
} /* clear the root's tag bit */ if (root_tag_get(root, tag)) root_tag_clear(root, tag); |
1da177e4c Linux-2.6.12-rc2 |
530 |
out: |
612d6c19d [PATCH] radix-tre... |
531 |
return slot; |
1da177e4c Linux-2.6.12-rc2 |
532 533 |
} EXPORT_SYMBOL(radix_tree_tag_clear); |
1da177e4c Linux-2.6.12-rc2 |
534 |
/** |
32605a181 [PATCH] radix_tag... |
535 536 537 |
* radix_tree_tag_get - get a tag on a radix tree node * @root: radix tree root * @index: index key |
daff89f32 [PATCH] radix-tre... |
538 |
* @tag: tag index (< RADIX_TREE_MAX_TAGS) |
1da177e4c Linux-2.6.12-rc2 |
539 |
* |
32605a181 [PATCH] radix_tag... |
540 |
* Return values: |
1da177e4c Linux-2.6.12-rc2 |
541 |
* |
612d6c19d [PATCH] radix-tre... |
542 543 |
* 0: tag not present or not set * 1: tag set |
ce82653d6 radix_tree_tag_ge... |
544 545 546 547 |
* * Note that the return value of this function may not be relied on, even if * the RCU lock is held, unless tag modification and node deletion are excluded * from concurrency. |
1da177e4c Linux-2.6.12-rc2 |
548 549 |
*/ int radix_tree_tag_get(struct radix_tree_root *root, |
daff89f32 [PATCH] radix-tre... |
550 |
unsigned long index, unsigned int tag) |
1da177e4c Linux-2.6.12-rc2 |
551 552 |
{ unsigned int height, shift; |
7cf9c2c76 [PATCH] radix-tre... |
553 |
struct radix_tree_node *node; |
1da177e4c Linux-2.6.12-rc2 |
554 |
|
612d6c19d [PATCH] radix-tre... |
555 556 557 |
/* check the root's tag bit */ if (!root_tag_get(root, tag)) return 0; |
2676a58c9 radix-tree: Disab... |
558 |
node = rcu_dereference_raw(root->rnode); |
7cf9c2c76 [PATCH] radix-tre... |
559 560 |
if (node == NULL) return 0; |
c0bc9875b radix-tree: use i... |
561 |
if (!radix_tree_is_indirect_ptr(node)) |
7cf9c2c76 [PATCH] radix-tre... |
562 |
return (index == 0); |
27d20fddc radix-tree: fix R... |
563 |
node = indirect_to_ptr(node); |
7cf9c2c76 [PATCH] radix-tre... |
564 565 566 567 |
height = node->height; if (index > radix_tree_maxindex(height)) return 0; |
612d6c19d [PATCH] radix-tre... |
568 |
|
1da177e4c Linux-2.6.12-rc2 |
569 |
shift = (height - 1) * RADIX_TREE_MAP_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
570 571 572 |
for ( ; ; ) { int offset; |
7cf9c2c76 [PATCH] radix-tre... |
573 |
if (node == NULL) |
1da177e4c Linux-2.6.12-rc2 |
574 575 576 |
return 0; offset = (index >> shift) & RADIX_TREE_MAP_MASK; |
7cf9c2c76 [PATCH] radix-tre... |
577 |
if (!tag_get(node, tag, offset)) |
3fa36acbc radix_tree: clean... |
578 |
return 0; |
ce82653d6 radix_tree_tag_ge... |
579 |
if (height == 1) |
3fa36acbc radix_tree: clean... |
580 |
return 1; |
2676a58c9 radix-tree: Disab... |
581 |
node = rcu_dereference_raw(node->slots[offset]); |
1da177e4c Linux-2.6.12-rc2 |
582 583 584 585 586 |
shift -= RADIX_TREE_MAP_SHIFT; height--; } } EXPORT_SYMBOL(radix_tree_tag_get); |
1da177e4c Linux-2.6.12-rc2 |
587 |
|
6df8ba4f8 radixtree: introd... |
588 |
/** |
ebf8aa44b radix-tree: omple... |
589 590 591 592 593 594 595 596 597 598 599 600 601 602 |
* radix_tree_range_tag_if_tagged - for each item in given range set given * tag if item has another tag set * @root: radix tree root * @first_indexp: pointer to a starting index of a range to scan * @last_index: last index of a range to scan * @nr_to_tag: maximum number items to tag * @iftag: tag index to test * @settag: tag index to set if tested tag is set * * This function scans range of radix tree from first_index to last_index * (inclusive). For each item in the range if iftag is set, the function sets * also settag. The function stops either after tagging nr_to_tag items or * after reaching last_index. * |
144dcfc01 radix-tree: radix... |
603 604 605 606 607 608 609 |
* The tags must be set from the leaf level only and propagated back up the * path to the root. We must do this so that we resolve the full path before * setting any tags on intermediate nodes. If we set tags as we descend, then * we can get to the leaf node and find that the index that has the iftag * set is outside the range we are scanning. This reults in dangling tags and * can lead to problems with later tag operations (e.g. livelocks on lookups). * |
ebf8aa44b radix-tree: omple... |
610 611 |
* The function returns number of leaves where the tag was set and sets * *first_indexp to the first unscanned index. |
d5ed3a4af lib/radix-tree.c:... |
612 613 |
* WARNING! *first_indexp can wrap if last_index is ULONG_MAX. Caller must * be prepared to handle that. |
ebf8aa44b radix-tree: omple... |
614 615 616 617 618 619 |
*/ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root, unsigned long *first_indexp, unsigned long last_index, unsigned long nr_to_tag, unsigned int iftag, unsigned int settag) { |
144dcfc01 radix-tree: radix... |
620 |
unsigned int height = root->height; |
e2bdb933a radix_tree: take ... |
621 |
struct radix_tree_node *node = NULL; |
144dcfc01 radix-tree: radix... |
622 623 624 625 |
struct radix_tree_node *slot; unsigned int shift; unsigned long tagged = 0; unsigned long index = *first_indexp; |
ebf8aa44b radix-tree: omple... |
626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 |
last_index = min(last_index, radix_tree_maxindex(height)); if (index > last_index) return 0; if (!nr_to_tag) return 0; if (!root_tag_get(root, iftag)) { *first_indexp = last_index + 1; return 0; } if (height == 0) { *first_indexp = last_index + 1; root_tag_set(root, settag); return 1; } shift = (height - 1) * RADIX_TREE_MAP_SHIFT; |
27d20fddc radix-tree: fix R... |
643 |
slot = indirect_to_ptr(root->rnode); |
ebf8aa44b radix-tree: omple... |
644 645 |
for (;;) { |
e2bdb933a radix_tree: take ... |
646 |
unsigned long upindex; |
ebf8aa44b radix-tree: omple... |
647 648 649 650 651 652 653 |
int offset; offset = (index >> shift) & RADIX_TREE_MAP_MASK; if (!slot->slots[offset]) goto next; if (!tag_get(slot, iftag, offset)) goto next; |
e2bdb933a radix_tree: take ... |
654 |
if (shift) { |
144dcfc01 radix-tree: radix... |
655 |
/* Go down one level */ |
144dcfc01 radix-tree: radix... |
656 |
shift -= RADIX_TREE_MAP_SHIFT; |
e2bdb933a radix_tree: take ... |
657 |
node = slot; |
144dcfc01 radix-tree: radix... |
658 659 660 661 662 663 |
slot = slot->slots[offset]; continue; } /* tag the leaf */ tagged++; |
ebf8aa44b radix-tree: omple... |
664 |
tag_set(slot, settag, offset); |
144dcfc01 radix-tree: radix... |
665 666 |
/* walk back up the path tagging interior nodes */ |
e2bdb933a radix_tree: take ... |
667 668 669 670 |
upindex = index; while (node) { upindex >>= RADIX_TREE_MAP_SHIFT; offset = upindex & RADIX_TREE_MAP_MASK; |
144dcfc01 radix-tree: radix... |
671 |
/* stop if we find a node with the tag already set */ |
e2bdb933a radix_tree: take ... |
672 |
if (tag_get(node, settag, offset)) |
144dcfc01 radix-tree: radix... |
673 |
break; |
e2bdb933a radix_tree: take ... |
674 675 |
tag_set(node, settag, offset); node = node->parent; |
ebf8aa44b radix-tree: omple... |
676 |
} |
144dcfc01 radix-tree: radix... |
677 |
|
e2bdb933a radix_tree: take ... |
678 679 680 681 682 683 684 685 |
/* * Small optimization: now clear that node pointer. * Since all of this slot's ancestors now have the tag set * from setting it above, we have no further need to walk * back up the tree setting tags, until we update slot to * point to another radix_tree_node. */ node = NULL; |
ebf8aa44b radix-tree: omple... |
686 687 688 |
next: /* Go to next item at level determined by 'shift' */ index = ((index >> shift) + 1) << shift; |
d5ed3a4af lib/radix-tree.c:... |
689 690 |
/* Overflow can happen when last_index is ~0UL... */ if (index > last_index || !index) |
ebf8aa44b radix-tree: omple... |
691 692 693 694 695 696 697 698 699 |
break; if (tagged >= nr_to_tag) break; while (((index >> shift) & RADIX_TREE_MAP_MASK) == 0) { /* * We've fully scanned this node. Go up. Because * last_index is guaranteed to be in the tree, what * we do below cannot wander astray. */ |
e2bdb933a radix_tree: take ... |
700 |
slot = slot->parent; |
ebf8aa44b radix-tree: omple... |
701 702 703 704 |
shift += RADIX_TREE_MAP_SHIFT; } } /* |
ac15ee691 radix_tree: radix... |
705 706 |
* We need not to tag the root tag if there is no tag which is set with * settag within the range from *first_indexp to last_index. |
ebf8aa44b radix-tree: omple... |
707 |
*/ |
ac15ee691 radix_tree: radix... |
708 709 |
if (tagged > 0) root_tag_set(root, settag); |
ebf8aa44b radix-tree: omple... |
710 711 712 713 714 715 716 717 |
*first_indexp = index; return tagged; } EXPORT_SYMBOL(radix_tree_range_tag_if_tagged); /** |
6df8ba4f8 radixtree: introd... |
718 719 720 721 722 723 724 725 726 727 |
* radix_tree_next_hole - find the next hole (not-present entry) * @root: tree root * @index: index key * @max_scan: maximum range to search * * Search the set [index, min(index+max_scan-1, MAX_INDEX)] for the lowest * indexed hole. * * Returns: the index of the hole if found, otherwise returns an index * outside of the set specified (in which case 'return - index >= max_scan' |
8e6bdb7f8 trivial: radix-tr... |
728 |
* will be true). In rare cases of index wrap-around, 0 will be returned. |
6df8ba4f8 radixtree: introd... |
729 730 |
* * radix_tree_next_hole may be called under rcu_read_lock. However, like |
8e6bdb7f8 trivial: radix-tr... |
731 732 733 734 735 |
* radix_tree_gang_lookup, this will not atomically search a snapshot of * the tree at a single point in time. For example, if a hole is created * at index 5, then subsequently a hole is created at index 10, * radix_tree_next_hole covering both indexes may return 10 if called * under rcu_read_lock. |
6df8ba4f8 radixtree: introd... |
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 |
*/ unsigned long radix_tree_next_hole(struct radix_tree_root *root, unsigned long index, unsigned long max_scan) { unsigned long i; for (i = 0; i < max_scan; i++) { if (!radix_tree_lookup(root, index)) break; index++; if (index == 0) break; } return index; } EXPORT_SYMBOL(radix_tree_next_hole); |
dc566127d radix-tree: add r... |
753 754 755 756 757 758 759 760 761 762 763 |
/** * radix_tree_prev_hole - find the prev hole (not-present entry) * @root: tree root * @index: index key * @max_scan: maximum range to search * * Search backwards in the range [max(index-max_scan+1, 0), index] * for the first hole. * * Returns: the index of the hole if found, otherwise returns an index * outside of the set specified (in which case 'index - return >= max_scan' |
edcd1d843 radix-tree: fix r... |
764 |
* will be true). In rare cases of wrap-around, ULONG_MAX will be returned. |
dc566127d radix-tree: add r... |
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 |
* * radix_tree_next_hole may be called under rcu_read_lock. However, like * radix_tree_gang_lookup, this will not atomically search a snapshot of * the tree at a single point in time. For example, if a hole is created * at index 10, then subsequently a hole is created at index 5, * radix_tree_prev_hole covering both indexes may return 5 if called under * rcu_read_lock. */ unsigned long radix_tree_prev_hole(struct radix_tree_root *root, unsigned long index, unsigned long max_scan) { unsigned long i; for (i = 0; i < max_scan; i++) { if (!radix_tree_lookup(root, index)) break; index--; |
edcd1d843 radix-tree: fix r... |
782 |
if (index == ULONG_MAX) |
dc566127d radix-tree: add r... |
783 784 785 786 787 788 |
break; } return index; } EXPORT_SYMBOL(radix_tree_prev_hole); |
1da177e4c Linux-2.6.12-rc2 |
789 |
static unsigned int |
6328650bb radix_tree: excep... |
790 791 |
__lookup(struct radix_tree_node *slot, void ***results, unsigned long *indices, unsigned long index, unsigned int max_items, unsigned long *next_index) |
1da177e4c Linux-2.6.12-rc2 |
792 793 |
{ unsigned int nr_found = 0; |
201b6264f [PATCH] radix-tre... |
794 |
unsigned int shift, height; |
201b6264f [PATCH] radix-tre... |
795 |
unsigned long i; |
7cf9c2c76 [PATCH] radix-tre... |
796 797 |
height = slot->height; if (height == 0) |
201b6264f [PATCH] radix-tre... |
798 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
799 |
shift = (height-1) * RADIX_TREE_MAP_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
800 |
|
201b6264f [PATCH] radix-tre... |
801 |
for ( ; height > 1; height--) { |
7cf9c2c76 [PATCH] radix-tre... |
802 803 |
i = (index >> shift) & RADIX_TREE_MAP_MASK; for (;;) { |
1da177e4c Linux-2.6.12-rc2 |
804 805 806 807 808 809 |
if (slot->slots[i] != NULL) break; index &= ~((1UL << shift) - 1); index += 1UL << shift; if (index == 0) goto out; /* 32-bit wraparound */ |
7cf9c2c76 [PATCH] radix-tre... |
810 811 812 |
i++; if (i == RADIX_TREE_MAP_SIZE) goto out; |
1da177e4c Linux-2.6.12-rc2 |
813 |
} |
1da177e4c Linux-2.6.12-rc2 |
814 |
|
1da177e4c Linux-2.6.12-rc2 |
815 |
shift -= RADIX_TREE_MAP_SHIFT; |
2676a58c9 radix-tree: Disab... |
816 |
slot = rcu_dereference_raw(slot->slots[i]); |
7cf9c2c76 [PATCH] radix-tre... |
817 818 |
if (slot == NULL) goto out; |
1da177e4c Linux-2.6.12-rc2 |
819 |
} |
201b6264f [PATCH] radix-tre... |
820 821 822 |
/* Bottom level: grab some items */ for (i = index & RADIX_TREE_MAP_MASK; i < RADIX_TREE_MAP_SIZE; i++) { |
47feff2c8 radix-tree: add g... |
823 |
if (slot->slots[i]) { |
6328650bb radix_tree: excep... |
824 825 826 827 828 |
results[nr_found] = &(slot->slots[i]); if (indices) indices[nr_found] = index; if (++nr_found == max_items) { index++; |
201b6264f [PATCH] radix-tre... |
829 |
goto out; |
6328650bb radix_tree: excep... |
830 |
} |
201b6264f [PATCH] radix-tre... |
831 |
} |
6328650bb radix_tree: excep... |
832 |
index++; |
201b6264f [PATCH] radix-tre... |
833 |
} |
1da177e4c Linux-2.6.12-rc2 |
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 |
out: *next_index = index; return nr_found; } /** * radix_tree_gang_lookup - perform multiple lookup on a radix tree * @root: radix tree root * @results: where the results of the lookup are placed * @first_index: start the lookup from this key * @max_items: place up to this many items at *results * * Performs an index-ascending scan of the tree for present items. Places * them at *@results and returns the number of items which were placed at * *@results. * * The implementation is naive. |
7cf9c2c76 [PATCH] radix-tre... |
851 852 853 854 855 856 |
* * Like radix_tree_lookup, radix_tree_gang_lookup may be called under * rcu_read_lock. In this case, rather than the returned results being * an atomic snapshot of the tree at a single point in time, the semantics * of an RCU protected gang lookup are as though multiple radix_tree_lookups * have been issued in individual locks, and results stored in 'results'. |
1da177e4c Linux-2.6.12-rc2 |
857 858 859 860 861 |
*/ unsigned int radix_tree_gang_lookup(struct radix_tree_root *root, void **results, unsigned long first_index, unsigned int max_items) { |
7cf9c2c76 [PATCH] radix-tre... |
862 863 |
unsigned long max_index; struct radix_tree_node *node; |
1da177e4c Linux-2.6.12-rc2 |
864 |
unsigned long cur_index = first_index; |
7cf9c2c76 [PATCH] radix-tre... |
865 |
unsigned int ret; |
2676a58c9 radix-tree: Disab... |
866 |
node = rcu_dereference_raw(root->rnode); |
7cf9c2c76 [PATCH] radix-tre... |
867 868 |
if (!node) return 0; |
1da177e4c Linux-2.6.12-rc2 |
869 |
|
c0bc9875b radix-tree: use i... |
870 |
if (!radix_tree_is_indirect_ptr(node)) { |
7cf9c2c76 [PATCH] radix-tre... |
871 872 |
if (first_index > 0) return 0; |
c0bc9875b radix-tree: use i... |
873 |
results[0] = node; |
7cf9c2c76 [PATCH] radix-tre... |
874 875 |
return 1; } |
27d20fddc radix-tree: fix R... |
876 |
node = indirect_to_ptr(node); |
7cf9c2c76 [PATCH] radix-tre... |
877 878 879 880 |
max_index = radix_tree_maxindex(node->height); ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
881 |
while (ret < max_items) { |
47feff2c8 radix-tree: add g... |
882 |
unsigned int nr_found, slots_found, i; |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 |
unsigned long next_index; /* Index of next search */ if (cur_index > max_index) break; |
6328650bb radix_tree: excep... |
887 888 |
slots_found = __lookup(node, (void ***)results + ret, NULL, cur_index, max_items - ret, &next_index); |
47feff2c8 radix-tree: add g... |
889 890 891 892 893 894 |
nr_found = 0; for (i = 0; i < slots_found; i++) { struct radix_tree_node *slot; slot = *(((void ***)results)[ret + i]); if (!slot) continue; |
27d20fddc radix-tree: fix R... |
895 896 |
results[ret + nr_found] = indirect_to_ptr(rcu_dereference_raw(slot)); |
47feff2c8 radix-tree: add g... |
897 898 |
nr_found++; } |
1da177e4c Linux-2.6.12-rc2 |
899 900 901 902 903 |
ret += nr_found; if (next_index == 0) break; cur_index = next_index; } |
7cf9c2c76 [PATCH] radix-tre... |
904 |
|
1da177e4c Linux-2.6.12-rc2 |
905 906 907 |
return ret; } EXPORT_SYMBOL(radix_tree_gang_lookup); |
47feff2c8 radix-tree: add g... |
908 909 910 911 |
/** * radix_tree_gang_lookup_slot - perform multiple slot lookup on radix tree * @root: radix tree root * @results: where the results of the lookup are placed |
6328650bb radix_tree: excep... |
912 |
* @indices: where their indices should be placed (but usually NULL) |
47feff2c8 radix-tree: add g... |
913 914 915 916 917 918 919 920 921 922 923 924 925 926 |
* @first_index: start the lookup from this key * @max_items: place up to this many items at *results * * Performs an index-ascending scan of the tree for present items. Places * their slots at *@results and returns the number of items which were * placed at *@results. * * The implementation is naive. * * Like radix_tree_gang_lookup as far as RCU and locking goes. Slots must * be dereferenced with radix_tree_deref_slot, and if using only RCU * protection, radix_tree_deref_slot may fail requiring a retry. */ unsigned int |
6328650bb radix_tree: excep... |
927 928 |
radix_tree_gang_lookup_slot(struct radix_tree_root *root, void ***results, unsigned long *indices, |
47feff2c8 radix-tree: add g... |
929 930 931 932 933 934 |
unsigned long first_index, unsigned int max_items) { unsigned long max_index; struct radix_tree_node *node; unsigned long cur_index = first_index; unsigned int ret; |
2676a58c9 radix-tree: Disab... |
935 |
node = rcu_dereference_raw(root->rnode); |
47feff2c8 radix-tree: add g... |
936 937 938 939 940 941 942 |
if (!node) return 0; if (!radix_tree_is_indirect_ptr(node)) { if (first_index > 0) return 0; results[0] = (void **)&root->rnode; |
6328650bb radix_tree: excep... |
943 944 |
if (indices) indices[0] = 0; |
47feff2c8 radix-tree: add g... |
945 946 |
return 1; } |
27d20fddc radix-tree: fix R... |
947 |
node = indirect_to_ptr(node); |
47feff2c8 radix-tree: add g... |
948 949 950 951 952 953 954 955 956 957 |
max_index = radix_tree_maxindex(node->height); ret = 0; while (ret < max_items) { unsigned int slots_found; unsigned long next_index; /* Index of next search */ if (cur_index > max_index) break; |
6328650bb radix_tree: excep... |
958 959 960 |
slots_found = __lookup(node, results + ret, indices ? indices + ret : NULL, cur_index, max_items - ret, &next_index); |
47feff2c8 radix-tree: add g... |
961 962 963 964 965 966 967 968 969 |
ret += slots_found; if (next_index == 0) break; cur_index = next_index; } return ret; } EXPORT_SYMBOL(radix_tree_gang_lookup_slot); |
1da177e4c Linux-2.6.12-rc2 |
970 971 972 973 974 |
/* * FIXME: the two tag_get()s here should use find_next_bit() instead of * open-coding the search. */ static unsigned int |
47feff2c8 radix-tree: add g... |
975 |
__lookup_tag(struct radix_tree_node *slot, void ***results, unsigned long index, |
daff89f32 [PATCH] radix-tre... |
976 |
unsigned int max_items, unsigned long *next_index, unsigned int tag) |
1da177e4c Linux-2.6.12-rc2 |
977 978 |
{ unsigned int nr_found = 0; |
7cf9c2c76 [PATCH] radix-tre... |
979 |
unsigned int shift, height; |
1da177e4c Linux-2.6.12-rc2 |
980 |
|
7cf9c2c76 [PATCH] radix-tre... |
981 982 |
height = slot->height; if (height == 0) |
612d6c19d [PATCH] radix-tre... |
983 |
goto out; |
7cf9c2c76 [PATCH] radix-tre... |
984 |
shift = (height-1) * RADIX_TREE_MAP_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
985 |
|
7cf9c2c76 [PATCH] radix-tre... |
986 987 |
while (height > 0) { unsigned long i = (index >> shift) & RADIX_TREE_MAP_MASK ; |
1da177e4c Linux-2.6.12-rc2 |
988 |
|
7cf9c2c76 [PATCH] radix-tre... |
989 990 |
for (;;) { if (tag_get(slot, tag, i)) |
1da177e4c Linux-2.6.12-rc2 |
991 |
break; |
1da177e4c Linux-2.6.12-rc2 |
992 993 994 995 |
index &= ~((1UL << shift) - 1); index += 1UL << shift; if (index == 0) goto out; /* 32-bit wraparound */ |
7cf9c2c76 [PATCH] radix-tre... |
996 997 998 |
i++; if (i == RADIX_TREE_MAP_SIZE) goto out; |
1da177e4c Linux-2.6.12-rc2 |
999 |
} |
1da177e4c Linux-2.6.12-rc2 |
1000 1001 1002 1003 1004 1005 |
height--; if (height == 0) { /* Bottom level: grab some items */ unsigned long j = index & RADIX_TREE_MAP_MASK; for ( ; j < RADIX_TREE_MAP_SIZE; j++) { index++; |
7cf9c2c76 [PATCH] radix-tre... |
1006 1007 |
if (!tag_get(slot, tag, j)) continue; |
7cf9c2c76 [PATCH] radix-tre... |
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 |
/* * Even though the tag was found set, we need to * recheck that we have a non-NULL node, because * if this lookup is lockless, it may have been * subsequently deleted. * * Similar care must be taken in any place that * lookup ->slots[x] without a lock (ie. can't * rely on its value remaining the same). */ |
47feff2c8 radix-tree: add g... |
1018 1019 |
if (slot->slots[j]) { results[nr_found++] = &(slot->slots[j]); |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 1022 1023 1024 1025 |
if (nr_found == max_items) goto out; } } } shift -= RADIX_TREE_MAP_SHIFT; |
2676a58c9 radix-tree: Disab... |
1026 |
slot = rcu_dereference_raw(slot->slots[i]); |
7cf9c2c76 [PATCH] radix-tre... |
1027 1028 1029 |
if (slot == NULL) break; } |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
out: *next_index = index; return nr_found; } /** * radix_tree_gang_lookup_tag - perform multiple lookup on a radix tree * based on a tag * @root: radix tree root * @results: where the results of the lookup are placed * @first_index: start the lookup from this key * @max_items: place up to this many items at *results |
daff89f32 [PATCH] radix-tre... |
1042 |
* @tag: the tag index (< RADIX_TREE_MAX_TAGS) |
1da177e4c Linux-2.6.12-rc2 |
1043 1044 1045 1046 1047 1048 1049 |
* * Performs an index-ascending scan of the tree for present items which * have the tag indexed by @tag set. Places the items at *@results and * returns the number of items which were placed at *@results. */ unsigned int radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results, |
daff89f32 [PATCH] radix-tre... |
1050 1051 |
unsigned long first_index, unsigned int max_items, unsigned int tag) |
1da177e4c Linux-2.6.12-rc2 |
1052 |
{ |
7cf9c2c76 [PATCH] radix-tre... |
1053 1054 |
struct radix_tree_node *node; unsigned long max_index; |
1da177e4c Linux-2.6.12-rc2 |
1055 |
unsigned long cur_index = first_index; |
7cf9c2c76 [PATCH] radix-tre... |
1056 |
unsigned int ret; |
1da177e4c Linux-2.6.12-rc2 |
1057 |
|
612d6c19d [PATCH] radix-tre... |
1058 1059 1060 |
/* check the root's tag bit */ if (!root_tag_get(root, tag)) return 0; |
2676a58c9 radix-tree: Disab... |
1061 |
node = rcu_dereference_raw(root->rnode); |
7cf9c2c76 [PATCH] radix-tre... |
1062 1063 |
if (!node) return 0; |
c0bc9875b radix-tree: use i... |
1064 |
if (!radix_tree_is_indirect_ptr(node)) { |
7cf9c2c76 [PATCH] radix-tre... |
1065 1066 |
if (first_index > 0) return 0; |
c0bc9875b radix-tree: use i... |
1067 |
results[0] = node; |
7cf9c2c76 [PATCH] radix-tre... |
1068 1069 |
return 1; } |
27d20fddc radix-tree: fix R... |
1070 |
node = indirect_to_ptr(node); |
7cf9c2c76 [PATCH] radix-tre... |
1071 1072 1073 1074 |
max_index = radix_tree_maxindex(node->height); ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1075 |
while (ret < max_items) { |
47feff2c8 radix-tree: add g... |
1076 |
unsigned int nr_found, slots_found, i; |
1da177e4c Linux-2.6.12-rc2 |
1077 1078 1079 1080 |
unsigned long next_index; /* Index of next search */ if (cur_index > max_index) break; |
47feff2c8 radix-tree: add g... |
1081 1082 1083 1084 1085 1086 1087 1088 |
slots_found = __lookup_tag(node, (void ***)results + ret, cur_index, max_items - ret, &next_index, tag); nr_found = 0; for (i = 0; i < slots_found; i++) { struct radix_tree_node *slot; slot = *(((void ***)results)[ret + i]); if (!slot) continue; |
27d20fddc radix-tree: fix R... |
1089 1090 |
results[ret + nr_found] = indirect_to_ptr(rcu_dereference_raw(slot)); |
47feff2c8 radix-tree: add g... |
1091 1092 |
nr_found++; } |
1da177e4c Linux-2.6.12-rc2 |
1093 1094 1095 1096 1097 |
ret += nr_found; if (next_index == 0) break; cur_index = next_index; } |
7cf9c2c76 [PATCH] radix-tre... |
1098 |
|
1da177e4c Linux-2.6.12-rc2 |
1099 1100 1101 1102 1103 |
return ret; } EXPORT_SYMBOL(radix_tree_gang_lookup_tag); /** |
47feff2c8 radix-tree: add g... |
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 |
* radix_tree_gang_lookup_tag_slot - perform multiple slot lookup on a * radix tree based on a tag * @root: radix tree root * @results: where the results of the lookup are placed * @first_index: start the lookup from this key * @max_items: place up to this many items at *results * @tag: the tag index (< RADIX_TREE_MAX_TAGS) * * Performs an index-ascending scan of the tree for present items which * have the tag indexed by @tag set. Places the slots at *@results and * returns the number of slots which were placed at *@results. */ unsigned int radix_tree_gang_lookup_tag_slot(struct radix_tree_root *root, void ***results, unsigned long first_index, unsigned int max_items, unsigned int tag) { struct radix_tree_node *node; unsigned long max_index; unsigned long cur_index = first_index; unsigned int ret; /* check the root's tag bit */ if (!root_tag_get(root, tag)) return 0; |
2676a58c9 radix-tree: Disab... |
1129 |
node = rcu_dereference_raw(root->rnode); |
47feff2c8 radix-tree: add g... |
1130 1131 1132 1133 1134 1135 1136 1137 1138 |
if (!node) return 0; if (!radix_tree_is_indirect_ptr(node)) { if (first_index > 0) return 0; results[0] = (void **)&root->rnode; return 1; } |
27d20fddc radix-tree: fix R... |
1139 |
node = indirect_to_ptr(node); |
47feff2c8 radix-tree: add g... |
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 |
max_index = radix_tree_maxindex(node->height); ret = 0; while (ret < max_items) { unsigned int slots_found; unsigned long next_index; /* Index of next search */ if (cur_index > max_index) break; slots_found = __lookup_tag(node, results + ret, cur_index, max_items - ret, &next_index, tag); ret += slots_found; if (next_index == 0) break; cur_index = next_index; } return ret; } EXPORT_SYMBOL(radix_tree_gang_lookup_tag_slot); |
e504f3fdd tmpfs radix_tree:... |
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 |
#if defined(CONFIG_SHMEM) && defined(CONFIG_SWAP) #include <linux/sched.h> /* for cond_resched() */ /* * This linear search is at present only useful to shmem_unuse_inode(). */ static unsigned long __locate(struct radix_tree_node *slot, void *item, unsigned long index, unsigned long *found_index) { unsigned int shift, height; unsigned long i; height = slot->height; shift = (height-1) * RADIX_TREE_MAP_SHIFT; for ( ; height > 1; height--) { i = (index >> shift) & RADIX_TREE_MAP_MASK; for (;;) { if (slot->slots[i] != NULL) break; index &= ~((1UL << shift) - 1); index += 1UL << shift; if (index == 0) goto out; /* 32-bit wraparound */ i++; if (i == RADIX_TREE_MAP_SIZE) goto out; } shift -= RADIX_TREE_MAP_SHIFT; slot = rcu_dereference_raw(slot->slots[i]); if (slot == NULL) goto out; } /* Bottom level: check items */ for (i = 0; i < RADIX_TREE_MAP_SIZE; i++) { if (slot->slots[i] == item) { *found_index = index + i; index = 0; goto out; } } index += RADIX_TREE_MAP_SIZE; out: return index; } /** * radix_tree_locate_item - search through radix tree for item * @root: radix tree root * @item: item to be found * * Returns index where item was found, or -1 if not found. * Caller must hold no lock (since this time-consuming function needs * to be preemptible), and must check afterwards if item is still there. */ unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item) { struct radix_tree_node *node; unsigned long max_index; unsigned long cur_index = 0; unsigned long found_index = -1; do { rcu_read_lock(); node = rcu_dereference_raw(root->rnode); if (!radix_tree_is_indirect_ptr(node)) { rcu_read_unlock(); if (node == item) found_index = 0; break; } node = indirect_to_ptr(node); max_index = radix_tree_maxindex(node->height); if (cur_index > max_index) break; cur_index = __locate(node, item, cur_index, &found_index); rcu_read_unlock(); cond_resched(); } while (cur_index != 0 && cur_index <= max_index); return found_index; } #else unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item) { return -1; } #endif /* CONFIG_SHMEM && CONFIG_SWAP */ |
47feff2c8 radix-tree: add g... |
1253 1254 |
/** |
a5f51c966 [PATCH] radix-tre... |
1255 1256 1257 1258 1259 1260 |
* radix_tree_shrink - shrink height of a radix tree to minimal * @root radix tree root */ static inline void radix_tree_shrink(struct radix_tree_root *root) { /* try to shrink tree height */ |
c0bc9875b radix-tree: use i... |
1261 |
while (root->height > 0) { |
a5f51c966 [PATCH] radix-tre... |
1262 |
struct radix_tree_node *to_free = root->rnode; |
e2bdb933a radix_tree: take ... |
1263 |
struct radix_tree_node *slot; |
a5f51c966 [PATCH] radix-tre... |
1264 |
|
c0bc9875b radix-tree: use i... |
1265 |
BUG_ON(!radix_tree_is_indirect_ptr(to_free)); |
27d20fddc radix-tree: fix R... |
1266 |
to_free = indirect_to_ptr(to_free); |
c0bc9875b radix-tree: use i... |
1267 1268 1269 1270 1271 1272 1273 1274 1275 |
/* * The candidate node has more than one child, or its child * is not at the leftmost slot, we cannot shrink. */ if (to_free->count != 1) break; if (!to_free->slots[0]) break; |
7cf9c2c76 [PATCH] radix-tre... |
1276 1277 |
/* * We don't need rcu_assign_pointer(), since we are simply |
27d20fddc radix-tree: fix R... |
1278 1279 |
* moving the node from one part of the tree to another: if it * was safe to dereference the old pointer to it |
7cf9c2c76 [PATCH] radix-tre... |
1280 |
* (to_free->slots[0]), it will be safe to dereference the new |
27d20fddc radix-tree: fix R... |
1281 |
* one (root->rnode) as far as dependent read barriers go. |
7cf9c2c76 [PATCH] radix-tre... |
1282 |
*/ |
e2bdb933a radix_tree: take ... |
1283 1284 1285 1286 1287 1288 |
slot = to_free->slots[0]; if (root->height > 1) { slot->parent = NULL; slot = ptr_to_indirect(slot); } root->rnode = slot; |
a5f51c966 [PATCH] radix-tre... |
1289 |
root->height--; |
27d20fddc radix-tree: fix R... |
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 |
/* * We have a dilemma here. The node's slot[0] must not be * NULLed in case there are concurrent lookups expecting to * find the item. However if this was a bottom-level node, * then it may be subject to the slot pointer being visible * to callers dereferencing it. If item corresponding to * slot[0] is subsequently deleted, these callers would expect * their slot to become empty sooner or later. * * For example, lockless pagecache will look up a slot, deref * the page pointer, and if the page is 0 refcount it means it * was concurrently deleted from pagecache so try the deref * again. Fortunately there is already a requirement for logic * to retry the entire slot lookup -- the indirect pointer * problem (replacing direct root node with an indirect pointer * also results in a stale slot). So tag the slot as indirect * to force callers to retry. */ if (root->height == 0) *((unsigned long *)&to_free->slots[0]) |= RADIX_TREE_INDIRECT_PTR; |
a5f51c966 [PATCH] radix-tre... |
1312 1313 1314 1315 1316 |
radix_tree_node_free(to_free); } } /** |
1da177e4c Linux-2.6.12-rc2 |
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 |
* radix_tree_delete - delete an item from a radix tree * @root: radix tree root * @index: index key * * Remove the item at @index from the radix tree rooted at @root. * * Returns the address of the deleted item, or NULL if it was not present. */ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index) { |
e2bdb933a radix_tree: take ... |
1327 |
struct radix_tree_node *node = NULL; |
612d6c19d [PATCH] radix-tre... |
1328 |
struct radix_tree_node *slot = NULL; |
7cf9c2c76 [PATCH] radix-tre... |
1329 |
struct radix_tree_node *to_free; |
1da177e4c Linux-2.6.12-rc2 |
1330 |
unsigned int height, shift; |
d5274261e [PATCH] radix tre... |
1331 |
int tag; |
e2bdb933a radix_tree: take ... |
1332 |
int uninitialized_var(offset); |
1da177e4c Linux-2.6.12-rc2 |
1333 1334 1335 1336 |
height = root->height; if (index > radix_tree_maxindex(height)) goto out; |
612d6c19d [PATCH] radix-tre... |
1337 |
slot = root->rnode; |
c0bc9875b radix-tree: use i... |
1338 |
if (height == 0) { |
612d6c19d [PATCH] radix-tre... |
1339 1340 1341 1342 |
root_tag_clear_all(root); root->rnode = NULL; goto out; } |
27d20fddc radix-tree: fix R... |
1343 |
slot = indirect_to_ptr(slot); |
e2bdb933a radix_tree: take ... |
1344 |
shift = height * RADIX_TREE_MAP_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
1345 |
|
612d6c19d [PATCH] radix-tre... |
1346 |
do { |
201b6264f [PATCH] radix-tre... |
1347 |
if (slot == NULL) |
1da177e4c Linux-2.6.12-rc2 |
1348 |
goto out; |
e2bdb933a radix_tree: take ... |
1349 |
shift -= RADIX_TREE_MAP_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
1350 |
offset = (index >> shift) & RADIX_TREE_MAP_MASK; |
e2bdb933a radix_tree: take ... |
1351 |
node = slot; |
201b6264f [PATCH] radix-tre... |
1352 |
slot = slot->slots[offset]; |
e2bdb933a radix_tree: take ... |
1353 |
} while (shift); |
1da177e4c Linux-2.6.12-rc2 |
1354 |
|
612d6c19d [PATCH] radix-tre... |
1355 |
if (slot == NULL) |
1da177e4c Linux-2.6.12-rc2 |
1356 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1357 |
/* |
e2bdb933a radix_tree: take ... |
1358 1359 |
* Clear all tags associated with the item to be deleted. * This way of doing it would be inefficient, but seldom is any set. |
1da177e4c Linux-2.6.12-rc2 |
1360 |
*/ |
daff89f32 [PATCH] radix-tre... |
1361 |
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) { |
e2bdb933a radix_tree: take ... |
1362 |
if (tag_get(node, tag, offset)) |
612d6c19d [PATCH] radix-tre... |
1363 |
radix_tree_tag_clear(root, index, tag); |
d5274261e [PATCH] radix tre... |
1364 |
} |
1da177e4c Linux-2.6.12-rc2 |
1365 |
|
7cf9c2c76 [PATCH] radix-tre... |
1366 |
to_free = NULL; |
201b6264f [PATCH] radix-tre... |
1367 |
/* Now free the nodes we do not need anymore */ |
e2bdb933a radix_tree: take ... |
1368 1369 1370 |
while (node) { node->slots[offset] = NULL; node->count--; |
7cf9c2c76 [PATCH] radix-tre... |
1371 1372 1373 1374 1375 1376 |
/* * Queue the node for deferred freeing after the * last reference to it disappears (set NULL, above). */ if (to_free) radix_tree_node_free(to_free); |
a5f51c966 [PATCH] radix-tre... |
1377 |
|
e2bdb933a radix_tree: take ... |
1378 1379 |
if (node->count) { if (node == indirect_to_ptr(root->rnode)) |
a5f51c966 [PATCH] radix-tre... |
1380 |
radix_tree_shrink(root); |
201b6264f [PATCH] radix-tre... |
1381 |
goto out; |
a5f51c966 [PATCH] radix-tre... |
1382 |
} |
201b6264f [PATCH] radix-tre... |
1383 1384 |
/* Node with zero slots in use so free it */ |
e2bdb933a radix_tree: take ... |
1385 |
to_free = node; |
7cf9c2c76 [PATCH] radix-tre... |
1386 |
|
e2bdb933a radix_tree: take ... |
1387 1388 1389 |
index >>= RADIX_TREE_MAP_SHIFT; offset = index & RADIX_TREE_MAP_MASK; node = node->parent; |
1da177e4c Linux-2.6.12-rc2 |
1390 |
} |
e2bdb933a radix_tree: take ... |
1391 |
|
612d6c19d [PATCH] radix-tre... |
1392 |
root_tag_clear_all(root); |
201b6264f [PATCH] radix-tre... |
1393 |
root->height = 0; |
612d6c19d [PATCH] radix-tre... |
1394 |
root->rnode = NULL; |
7cf9c2c76 [PATCH] radix-tre... |
1395 1396 |
if (to_free) radix_tree_node_free(to_free); |
612d6c19d [PATCH] radix-tre... |
1397 |
|
1da177e4c Linux-2.6.12-rc2 |
1398 |
out: |
612d6c19d [PATCH] radix-tre... |
1399 |
return slot; |
1da177e4c Linux-2.6.12-rc2 |
1400 1401 1402 1403 1404 1405 1406 1407 |
} EXPORT_SYMBOL(radix_tree_delete); /** * radix_tree_tagged - test whether any items in the tree are tagged * @root: radix tree root * @tag: tag to test */ |
daff89f32 [PATCH] radix-tre... |
1408 |
int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag) |
1da177e4c Linux-2.6.12-rc2 |
1409 |
{ |
612d6c19d [PATCH] radix-tre... |
1410 |
return root_tag_get(root, tag); |
1da177e4c Linux-2.6.12-rc2 |
1411 1412 1413 1414 |
} EXPORT_SYMBOL(radix_tree_tagged); static void |
51cc50685 SL*B: drop kmem c... |
1415 |
radix_tree_node_ctor(void *node) |
1da177e4c Linux-2.6.12-rc2 |
1416 1417 1418 1419 1420 1421 |
{ memset(node, 0, sizeof(struct radix_tree_node)); } static __init unsigned long __maxindex(unsigned int height) { |
430d275a3 avoid negative (a... |
1422 1423 1424 1425 1426 1427 1428 1429 |
unsigned int width = height * RADIX_TREE_MAP_SHIFT; int shift = RADIX_TREE_INDEX_BITS - width; if (shift < 0) return ~0UL; if (shift >= BITS_PER_LONG) return 0UL; return ~0UL >> shift; |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 1432 1433 1434 1435 1436 1437 1438 |
} static __init void radix_tree_init_maxindex(void) { unsigned int i; for (i = 0; i < ARRAY_SIZE(height_to_maxindex); i++) height_to_maxindex[i] = __maxindex(i); } |
1da177e4c Linux-2.6.12-rc2 |
1439 1440 1441 1442 1443 1444 1445 1446 |
static int radix_tree_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { int cpu = (long)hcpu; struct radix_tree_preload *rtp; /* Free per-cpu pool of perloaded nodes */ |
8bb784428 Add suspend-relat... |
1447 |
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
1da177e4c Linux-2.6.12-rc2 |
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 |
rtp = &per_cpu(radix_tree_preloads, cpu); while (rtp->nr) { kmem_cache_free(radix_tree_node_cachep, rtp->nodes[rtp->nr-1]); rtp->nodes[rtp->nr-1] = NULL; rtp->nr--; } } return NOTIFY_OK; } |
1da177e4c Linux-2.6.12-rc2 |
1458 1459 1460 1461 1462 |
void __init radix_tree_init(void) { radix_tree_node_cachep = kmem_cache_create("radix_tree_node", sizeof(struct radix_tree_node), 0, |
488514d17 Remove set_migrat... |
1463 1464 |
SLAB_PANIC | SLAB_RECLAIM_ACCOUNT, radix_tree_node_ctor); |
1da177e4c Linux-2.6.12-rc2 |
1465 1466 1467 |
radix_tree_init_maxindex(); hotcpu_notifier(radix_tree_callback, 0); } |