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b66b5a48b8
In preparation for the removal of the multiorder radix tree code, convert item_delete_rcu() to use the XArray so it can still be called for XArrays containing multi-index entries. Signed-off-by: Matthew Wilcox <willy@infradead.org>
288 lines
6.3 KiB
C
288 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdlib.h>
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#include <assert.h>
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#include <stdio.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include "test.h"
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struct item *
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item_tag_set(struct radix_tree_root *root, unsigned long index, int tag)
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{
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return radix_tree_tag_set(root, index, tag);
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}
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struct item *
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item_tag_clear(struct radix_tree_root *root, unsigned long index, int tag)
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{
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return radix_tree_tag_clear(root, index, tag);
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}
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int item_tag_get(struct radix_tree_root *root, unsigned long index, int tag)
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{
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return radix_tree_tag_get(root, index, tag);
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}
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struct item *item_create(unsigned long index, unsigned int order)
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{
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struct item *ret = malloc(sizeof(*ret));
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ret->index = index;
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ret->order = order;
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return ret;
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}
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int item_insert(struct radix_tree_root *root, unsigned long index)
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{
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struct item *item = item_create(index, 0);
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int err = radix_tree_insert(root, item->index, item);
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if (err)
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free(item);
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return err;
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}
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void item_sanity(struct item *item, unsigned long index)
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{
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unsigned long mask;
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assert(!radix_tree_is_internal_node(item));
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assert(item->order < BITS_PER_LONG);
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mask = (1UL << item->order) - 1;
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assert((item->index | mask) == (index | mask));
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}
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void item_free(struct item *item, unsigned long index)
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{
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item_sanity(item, index);
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free(item);
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}
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int item_delete(struct radix_tree_root *root, unsigned long index)
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{
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struct item *item = radix_tree_delete(root, index);
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if (!item)
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return 0;
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item_free(item, index);
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return 1;
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}
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static void item_free_rcu(struct rcu_head *head)
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{
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struct item *item = container_of(head, struct item, rcu_head);
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free(item);
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}
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int item_delete_rcu(struct xarray *xa, unsigned long index)
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{
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struct item *item = xa_erase(xa, index);
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if (item) {
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item_sanity(item, index);
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call_rcu(&item->rcu_head, item_free_rcu);
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return 1;
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}
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return 0;
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}
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void item_check_present(struct radix_tree_root *root, unsigned long index)
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{
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struct item *item;
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item = radix_tree_lookup(root, index);
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assert(item != NULL);
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item_sanity(item, index);
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}
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struct item *item_lookup(struct radix_tree_root *root, unsigned long index)
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{
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return radix_tree_lookup(root, index);
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}
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void item_check_absent(struct radix_tree_root *root, unsigned long index)
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{
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struct item *item;
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item = radix_tree_lookup(root, index);
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assert(item == NULL);
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}
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/*
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* Scan only the passed (start, start+nr] for present items
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*/
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void item_gang_check_present(struct radix_tree_root *root,
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unsigned long start, unsigned long nr,
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int chunk, int hop)
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{
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struct item *items[chunk];
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unsigned long into;
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for (into = 0; into < nr; ) {
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int nfound;
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int nr_to_find = chunk;
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int i;
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if (nr_to_find > (nr - into))
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nr_to_find = nr - into;
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nfound = radix_tree_gang_lookup(root, (void **)items,
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start + into, nr_to_find);
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assert(nfound == nr_to_find);
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for (i = 0; i < nfound; i++)
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assert(items[i]->index == start + into + i);
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into += hop;
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}
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}
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/*
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* Scan the entire tree, only expecting present items (start, start+nr]
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*/
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void item_full_scan(struct radix_tree_root *root, unsigned long start,
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unsigned long nr, int chunk)
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{
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struct item *items[chunk];
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unsigned long into = 0;
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unsigned long this_index = start;
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int nfound;
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int i;
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// printf("%s(0x%08lx, 0x%08lx, %d)\n", __FUNCTION__, start, nr, chunk);
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while ((nfound = radix_tree_gang_lookup(root, (void **)items, into,
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chunk))) {
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// printf("At 0x%08lx, nfound=%d\n", into, nfound);
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for (i = 0; i < nfound; i++) {
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assert(items[i]->index == this_index);
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this_index++;
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}
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// printf("Found 0x%08lx->0x%08lx\n",
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// items[0]->index, items[nfound-1]->index);
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into = this_index;
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}
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if (chunk)
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assert(this_index == start + nr);
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nfound = radix_tree_gang_lookup(root, (void **)items,
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this_index, chunk);
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assert(nfound == 0);
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}
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/* Use the same pattern as tag_pages_for_writeback() in mm/page-writeback.c */
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int tag_tagged_items(struct xarray *xa, unsigned long start, unsigned long end,
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unsigned batch, xa_mark_t iftag, xa_mark_t thentag)
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{
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XA_STATE(xas, xa, start);
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unsigned int tagged = 0;
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struct item *item;
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if (batch == 0)
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batch = 1;
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xas_lock_irq(&xas);
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xas_for_each_marked(&xas, item, end, iftag) {
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xas_set_mark(&xas, thentag);
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if (++tagged % batch)
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continue;
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xas_pause(&xas);
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xas_unlock_irq(&xas);
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rcu_barrier();
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xas_lock_irq(&xas);
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}
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xas_unlock_irq(&xas);
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return tagged;
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}
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static int verify_node(struct radix_tree_node *slot, unsigned int tag,
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int tagged)
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{
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int anyset = 0;
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int i;
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int j;
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slot = entry_to_node(slot);
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/* Verify consistency at this level */
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for (i = 0; i < RADIX_TREE_TAG_LONGS; i++) {
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if (slot->tags[tag][i]) {
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anyset = 1;
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break;
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}
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}
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if (tagged != anyset) {
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printf("tag: %u, shift %u, tagged: %d, anyset: %d\n",
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tag, slot->shift, tagged, anyset);
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for (j = 0; j < RADIX_TREE_MAX_TAGS; j++) {
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printf("tag %d: ", j);
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for (i = 0; i < RADIX_TREE_TAG_LONGS; i++)
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printf("%016lx ", slot->tags[j][i]);
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printf("\n");
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}
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return 1;
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}
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assert(tagged == anyset);
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/* Go for next level */
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if (slot->shift > 0) {
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for (i = 0; i < RADIX_TREE_MAP_SIZE; i++)
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if (slot->slots[i])
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if (verify_node(slot->slots[i], tag,
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!!test_bit(i, slot->tags[tag]))) {
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printf("Failure at off %d\n", i);
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for (j = 0; j < RADIX_TREE_MAX_TAGS; j++) {
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printf("tag %d: ", j);
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for (i = 0; i < RADIX_TREE_TAG_LONGS; i++)
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printf("%016lx ", slot->tags[j][i]);
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printf("\n");
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}
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return 1;
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}
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}
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return 0;
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}
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void verify_tag_consistency(struct radix_tree_root *root, unsigned int tag)
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{
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struct radix_tree_node *node = root->xa_head;
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if (!radix_tree_is_internal_node(node))
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return;
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verify_node(node, tag, !!root_tag_get(root, tag));
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}
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void item_kill_tree(struct xarray *xa)
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{
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XA_STATE(xas, xa, 0);
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void *entry;
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xas_for_each(&xas, entry, ULONG_MAX) {
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if (!xa_is_value(entry)) {
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item_free(entry, xas.xa_index);
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}
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xas_store(&xas, NULL);
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}
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assert(xa_empty(xa));
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}
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void tree_verify_min_height(struct radix_tree_root *root, int maxindex)
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{
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unsigned shift;
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struct radix_tree_node *node = root->xa_head;
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if (!radix_tree_is_internal_node(node)) {
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assert(maxindex == 0);
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return;
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}
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node = entry_to_node(node);
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assert(maxindex <= node_maxindex(node));
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shift = node->shift;
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if (shift > 0)
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assert(maxindex > shift_maxindex(shift - RADIX_TREE_MAP_SHIFT));
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else
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assert(maxindex > 0);
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}
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