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-rw-r--r--fs/btrfs/radix-tree.c836
1 files changed, 0 insertions, 836 deletions
diff --git a/fs/btrfs/radix-tree.c b/fs/btrfs/radix-tree.c
deleted file mode 100644
index baa25ca1c2ac..000000000000
--- a/fs/btrfs/radix-tree.c
+++ /dev/null
@@ -1,836 +0,0 @@
-/*
- * Copyright (C) 2001 Momchil Velikov
- * Portions Copyright (C) 2001 Christoph Hellwig
- * Copyright (C) 2005 SGI, Christoph Lameter <clameter@sgi.com>
- *
- * 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 "kerncompat.h"
-#include "radix-tree.h"
-#ifdef __KERNEL__
-#define RADIX_TREE_MAP_SHIFT (CONFIG_BASE_SMALL ? 4 : 6)
-#else
-#define RADIX_TREE_MAP_SHIFT 3 /* For more stressful testing */
-#endif
-
-#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 {
- unsigned int count;
- void *slots[RADIX_TREE_MAP_SIZE];
- unsigned long tags[RADIX_TREE_MAX_TAGS][RADIX_TREE_TAG_LONGS];
-};
-
-struct radix_tree_path {
- struct radix_tree_node *node;
- int offset;
-};
-
-#define RADIX_TREE_INDEX_BITS (8 /* CHAR_BIT */ * sizeof(unsigned long))
-#define RADIX_TREE_MAX_PATH (RADIX_TREE_INDEX_BITS/RADIX_TREE_MAP_SHIFT + 2)
-
-static unsigned long height_to_maxindex[RADIX_TREE_MAX_PATH] __read_mostly;
-
-/*
- * Per-cpu pool of preloaded nodes
- */
-struct radix_tree_preload {
- int nr;
- struct radix_tree_node *nodes[RADIX_TREE_MAX_PATH];
-};
-struct radix_tree_preload radix_tree_preloads = { 0, };
-
-static inline gfp_t root_gfp_mask(struct radix_tree_root *root)
-{
- return root->gfp_mask & __GFP_BITS_MASK;
-}
-
-static int internal_nodes = 0;
-/*
- * 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)
-{
- struct radix_tree_node *ret;
- ret = malloc(sizeof(struct radix_tree_node));
- if (ret) {
- memset(ret, 0, sizeof(struct radix_tree_node));
- internal_nodes++;
- }
- return ret;
-}
-
-static inline void
-radix_tree_node_free(struct radix_tree_node *node)
-{
- internal_nodes--;
- free(node);
-}
-
-/*
- * 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.
- */
-int radix_tree_preload(gfp_t gfp_mask)
-{
- 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();
- node = radix_tree_node_alloc(NULL);
- 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
- radix_tree_node_free(node);
- }
- ret = 0;
-out:
- return ret;
-}
-
-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;
-}
-
-/*
- * 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;
- unsigned int height;
- 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;
- }
-
- do {
- if (!(node = radix_tree_node_alloc(root)))
- return -ENOMEM;
-
- /* Increase the height. */
- node->slots[0] = root->rnode;
-
- /* Propagate the aggregated tag info into the new root */
- for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) {
- if (root_tag_get(root, tag))
- tag_set(node, tag, 0);
- }
-
- node->count = 1;
- root->rnode = node;
- root->height++;
- } 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)
-{
- struct radix_tree_node *node = NULL, *slot;
- unsigned int height, shift;
- int offset;
- int error;
-
- /* Make sure the tree is high enough. */
- if (index > radix_tree_maxindex(root->height)) {
- error = radix_tree_extend(root, index);
- if (error)
- return error;
- }
-
- slot = root->rnode;
- height = root->height;
- shift = (height-1) * RADIX_TREE_MAP_SHIFT;
-
- offset = 0; /* uninitialised var warning */
- while (height > 0) {
- if (slot == NULL) {
- /* Have to add a child node. */
- if (!(slot = radix_tree_node_alloc(root)))
- return -ENOMEM;
- if (node) {
- node->slots[offset] = slot;
- node->count++;
- } else
- root->rnode = slot;
- }
-
- /* Go a level down */
- offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- node = slot;
- slot = node->slots[offset];
- shift -= RADIX_TREE_MAP_SHIFT;
- height--;
- }
-
- if (slot != NULL)
- return -EEXIST;
-
- if (node) {
- node->count++;
- node->slots[offset] = item;
- BUG_ON(tag_get(node, 0, offset));
- BUG_ON(tag_get(node, 1, offset));
- } else {
- root->rnode = item;
- BUG_ON(root_tag_get(root, 0));
- BUG_ON(root_tag_get(root, 1));
- }
-
- return 0;
-}
-
-static inline void **__lookup_slot(struct radix_tree_root *root,
- unsigned long index)
-{
- unsigned int height, shift;
- struct radix_tree_node **slot;
-
- height = root->height;
-
- if (index > radix_tree_maxindex(height))
- return NULL;
-
- if (height == 0 && root->rnode)
- return (void **)&root->rnode;
-
- shift = (height-1) * RADIX_TREE_MAP_SHIFT;
- slot = &root->rnode;
-
- while (height > 0) {
- if (*slot == NULL)
- return NULL;
-
- slot = (struct radix_tree_node **)
- ((*slot)->slots +
- ((index >> shift) & RADIX_TREE_MAP_MASK));
- shift -= RADIX_TREE_MAP_SHIFT;
- height--;
- }
-
- return (void **)slot;
-}
-
-/**
- * radix_tree_lookup_slot - lookup a slot in a radix tree
- * @root: radix tree root
- * @index: index key
- *
- * Lookup the slot corresponding to the position @index in the radix tree
- * @root. This is useful for update-if-exists operations.
- */
-void **radix_tree_lookup_slot(struct radix_tree_root *root, unsigned long index)
-{
- return __lookup_slot(root, index);
-}
-
-/**
- * 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.
- */
-void *radix_tree_lookup(struct radix_tree_root *root, unsigned long index)
-{
- void **slot;
-
- slot = __lookup_slot(root, index);
- return slot != NULL ? *slot : NULL;
-}
-
-/**
- * radix_tree_tag_set - set a tag on a radix tree node
- * @root: radix tree root
- * @index: index key
- * @tag: tag index
- *
- * Set the search tag (which must be < RADIX_TREE_MAX_TAGS)
- * corresponding to @index in the radix tree. From
- * 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,
- unsigned long index, unsigned int tag)
-{
- unsigned int height, shift;
- struct radix_tree_node *slot;
-
- height = root->height;
- BUG_ON(index > radix_tree_maxindex(height));
-
- slot = root->rnode;
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
-
- while (height > 0) {
- int offset;
-
- offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- if (!tag_get(slot, tag, offset))
- tag_set(slot, tag, offset);
- slot = slot->slots[offset];
- BUG_ON(slot == NULL);
- shift -= RADIX_TREE_MAP_SHIFT;
- height--;
- }
-
- /* set the root's tag bit */
- if (slot && !root_tag_get(root, tag))
- root_tag_set(root, tag);
-
- return slot;
-}
-
-/**
- * radix_tree_tag_clear - clear a tag on a radix tree node
- * @root: radix tree root
- * @index: index key
- * @tag: tag index
- *
- * Clear the search tag (which must be < RADIX_TREE_MAX_TAGS)
- * corresponding to @index in the radix tree. If
- * 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,
- unsigned long index, unsigned int tag)
-{
- struct radix_tree_path path[RADIX_TREE_MAX_PATH], *pathp = path;
- struct radix_tree_node *slot = NULL;
- unsigned int height, shift;
-
- height = root->height;
- if (index > radix_tree_maxindex(height))
- goto out;
-
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
- pathp->node = NULL;
- slot = root->rnode;
-
- while (height > 0) {
- int offset;
-
- if (slot == NULL)
- goto out;
-
- offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- pathp[1].offset = offset;
- pathp[1].node = slot;
- slot = slot->slots[offset];
- pathp++;
- shift -= RADIX_TREE_MAP_SHIFT;
- height--;
- }
-
- if (slot == NULL)
- goto out;
-
- while (pathp->node) {
- if (!tag_get(pathp->node, tag, pathp->offset))
- goto out;
- tag_clear(pathp->node, tag, pathp->offset);
- if (any_tag_set(pathp->node, tag))
- goto out;
- pathp--;
- }
-
- /* clear the root's tag bit */
- if (root_tag_get(root, tag))
- root_tag_clear(root, tag);
-
-out:
- return slot;
-}
-
-#ifndef __KERNEL__ /* Only the test harness uses this at present */
-/**
- * radix_tree_tag_get - get a tag on a radix tree node
- * @root: radix tree root
- * @index: index key
- * @tag: tag index (< RADIX_TREE_MAX_TAGS)
- *
- * Return values:
- *
- * 0: tag not present or not set
- * 1: tag set
- */
-int radix_tree_tag_get(struct radix_tree_root *root,
- unsigned long index, unsigned int tag)
-{
- unsigned int height, shift;
- struct radix_tree_node *slot;
- int saw_unset_tag = 0;
-
- height = root->height;
- if (index > radix_tree_maxindex(height))
- return 0;
-
- /* check the root's tag bit */
- if (!root_tag_get(root, tag))
- return 0;
-
- if (height == 0)
- return 1;
-
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
- slot = root->rnode;
-
- for ( ; ; ) {
- int offset;
-
- if (slot == NULL)
- return 0;
-
- offset = (index >> shift) & RADIX_TREE_MAP_MASK;
-
- /*
- * This is just a debug check. Later, we can bale as soon as
- * we see an unset tag.
- */
- if (!tag_get(slot, tag, offset))
- saw_unset_tag = 1;
- if (height == 1) {
- int ret = tag_get(slot, tag, offset);
-
- BUG_ON(ret && saw_unset_tag);
- return !!ret;
- }
- slot = slot->slots[offset];
- shift -= RADIX_TREE_MAP_SHIFT;
- height--;
- }
-}
-#endif
-
-static unsigned int
-__lookup(struct radix_tree_root *root, void **results, unsigned long index,
- unsigned int max_items, unsigned long *next_index)
-{
- unsigned int nr_found = 0;
- unsigned int shift, height;
- struct radix_tree_node *slot;
- unsigned long i;
-
- height = root->height;
- if (height == 0) {
- if (root->rnode && index == 0)
- results[nr_found++] = root->rnode;
- goto out;
- }
-
- shift = (height-1) * RADIX_TREE_MAP_SHIFT;
- slot = root->rnode;
-
- for ( ; height > 1; height--) {
-
- for (i = (index >> shift) & RADIX_TREE_MAP_MASK ;
- i < RADIX_TREE_MAP_SIZE; i++) {
- if (slot->slots[i] != NULL)
- break;
- index &= ~((1UL << shift) - 1);
- index += 1UL << shift;
- if (index == 0)
- goto out; /* 32-bit wraparound */
- }
- if (i == RADIX_TREE_MAP_SIZE)
- goto out;
-
- shift -= RADIX_TREE_MAP_SHIFT;
- slot = slot->slots[i];
- }
-
- /* Bottom level: grab some items */
- for (i = index & RADIX_TREE_MAP_MASK; i < RADIX_TREE_MAP_SIZE; i++) {
- index++;
- if (slot->slots[i]) {
- results[nr_found++] = slot->slots[i];
- if (nr_found == max_items)
- goto out;
- }
- }
-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.
- */
-unsigned int
-radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
- unsigned long first_index, unsigned int max_items)
-{
- const unsigned long max_index = radix_tree_maxindex(root->height);
- unsigned long cur_index = first_index;
- unsigned int ret = 0;
-
- while (ret < max_items) {
- unsigned int nr_found;
- unsigned long next_index; /* Index of next search */
-
- if (cur_index > max_index)
- break;
- nr_found = __lookup(root, results + ret, cur_index,
- max_items - ret, &next_index);
- ret += nr_found;
- if (next_index == 0)
- break;
- cur_index = next_index;
- }
- return ret;
-}
-
-/*
- * FIXME: the two tag_get()s here should use find_next_bit() instead of
- * open-coding the search.
- */
-static unsigned int
-__lookup_tag(struct radix_tree_root *root, void **results, unsigned long index,
- unsigned int max_items, unsigned long *next_index, unsigned int tag)
-{
- unsigned int nr_found = 0;
- unsigned int shift;
- unsigned int height = root->height;
- struct radix_tree_node *slot;
-
- if (height == 0) {
- if (root->rnode && index == 0)
- results[nr_found++] = root->rnode;
- goto out;
- }
-
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
- slot = root->rnode;
-
- do {
- unsigned long i = (index >> shift) & RADIX_TREE_MAP_MASK;
-
- for ( ; i < RADIX_TREE_MAP_SIZE; i++) {
- if (tag_get(slot, tag, i)) {
- BUG_ON(slot->slots[i] == NULL);
- break;
- }
- index &= ~((1UL << shift) - 1);
- index += 1UL << shift;
- if (index == 0)
- goto out; /* 32-bit wraparound */
- }
- if (i == RADIX_TREE_MAP_SIZE)
- goto out;
- 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++;
- if (tag_get(slot, tag, j)) {
- BUG_ON(slot->slots[j] == NULL);
- results[nr_found++] = slot->slots[j];
- if (nr_found == max_items)
- goto out;
- }
- }
- }
- shift -= RADIX_TREE_MAP_SHIFT;
- slot = slot->slots[i];
- } while (height > 0);
-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
- * @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 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,
- unsigned long first_index, unsigned int max_items,
- unsigned int tag)
-{
- const unsigned long max_index = radix_tree_maxindex(root->height);
- unsigned long cur_index = first_index;
- unsigned int ret = 0;
-
- /* check the root's tag bit */
- if (!root_tag_get(root, tag))
- return 0;
-
- while (ret < max_items) {
- unsigned int nr_found;
- unsigned long next_index; /* Index of next search */
-
- if (cur_index > max_index)
- break;
- nr_found = __lookup_tag(root, results + ret, cur_index,
- max_items - ret, &next_index, tag);
- ret += nr_found;
- if (next_index == 0)
- break;
- cur_index = next_index;
- }
- return ret;
-}
-
-/**
- * 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 */
- while (root->height > 0 &&
- root->rnode->count == 1 &&
- root->rnode->slots[0]) {
- struct radix_tree_node *to_free = root->rnode;
-
- root->rnode = to_free->slots[0];
- root->height--;
- /* must only free zeroed nodes into the slab */
- tag_clear(to_free, 0, 0);
- tag_clear(to_free, 1, 0);
- to_free->slots[0] = NULL;
- to_free->count = 0;
- radix_tree_node_free(to_free);
- }
-}
-
-/**
- * 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)
-{
- struct radix_tree_path path[RADIX_TREE_MAX_PATH], *pathp = path;
- struct radix_tree_node *slot = NULL;
- unsigned int height, shift;
- int tag;
- int offset;
-
- height = root->height;
- if (index > radix_tree_maxindex(height))
- goto out;
-
- slot = root->rnode;
- if (height == 0 && root->rnode) {
- root_tag_clear_all(root);
- root->rnode = NULL;
- goto out;
- }
-
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
- pathp->node = NULL;
-
- do {
- if (slot == NULL)
- goto out;
-
- pathp++;
- offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- pathp->offset = offset;
- pathp->node = slot;
- slot = slot->slots[offset];
- shift -= RADIX_TREE_MAP_SHIFT;
- height--;
- } while (height > 0);
-
- if (slot == NULL)
- goto out;
-
- /*
- * Clear all tags associated with the just-deleted item
- */
- for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) {
- if (tag_get(pathp->node, tag, pathp->offset))
- radix_tree_tag_clear(root, index, tag);
- }
-
- /* Now free the nodes we do not need anymore */
- while (pathp->node) {
- pathp->node->slots[pathp->offset] = NULL;
- pathp->node->count--;
-
- if (pathp->node->count) {
- if (pathp->node == root->rnode)
- radix_tree_shrink(root);
- goto out;
- }
-
- /* Node with zero slots in use so free it */
- radix_tree_node_free(pathp->node);
-
- pathp--;
- }
- root_tag_clear_all(root);
- root->height = 0;
- root->rnode = NULL;
-
-out:
- return slot;
-}
-
-/**
- * radix_tree_tagged - test whether any items in the tree are tagged
- * @root: radix tree root
- * @tag: tag to test
- */
-int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag)
-{
- return root_tag_get(root, tag);
-}
-
-static unsigned long __maxindex(unsigned int height)
-{
- unsigned int tmp = height * RADIX_TREE_MAP_SHIFT;
- unsigned long index = (~0UL >> (RADIX_TREE_INDEX_BITS - tmp - 1)) >> 1;
-
- if (tmp >= RADIX_TREE_INDEX_BITS)
- index = ~0UL;
- return index;
-}
-
-static 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);
-}
-
-void radix_tree_init(void)
-{
- radix_tree_init_maxindex();
-}