805 lines
18 KiB
C
805 lines
18 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#include "dm-btree-internal.h"
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#include "dm-space-map.h"
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#include "dm-transaction-manager.h"
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#include <linux/export.h>
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#include <linux/device-mapper.h>
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#define DM_MSG_PREFIX "btree"
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/*----------------------------------------------------------------
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* Array manipulation
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*--------------------------------------------------------------*/
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static void memcpy_disk(void *dest, const void *src, size_t len)
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__dm_written_to_disk(src)
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{
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memcpy(dest, src, len);
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__dm_unbless_for_disk(src);
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}
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static void array_insert(void *base, size_t elt_size, unsigned nr_elts,
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unsigned index, void *elt)
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__dm_written_to_disk(elt)
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{
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if (index < nr_elts)
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memmove(base + (elt_size * (index + 1)),
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base + (elt_size * index),
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(nr_elts - index) * elt_size);
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memcpy_disk(base + (elt_size * index), elt, elt_size);
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}
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/*----------------------------------------------------------------*/
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/* makes the assumption that no two keys are the same. */
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static int bsearch(struct node *n, uint64_t key, int want_hi)
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{
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int lo = -1, hi = le32_to_cpu(n->header.nr_entries);
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while (hi - lo > 1) {
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int mid = lo + ((hi - lo) / 2);
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uint64_t mid_key = le64_to_cpu(n->keys[mid]);
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if (mid_key == key)
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return mid;
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if (mid_key < key)
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lo = mid;
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else
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hi = mid;
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}
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return want_hi ? hi : lo;
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}
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int lower_bound(struct node *n, uint64_t key)
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{
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return bsearch(n, key, 0);
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}
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void inc_children(struct dm_transaction_manager *tm, struct node *n,
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struct dm_btree_value_type *vt)
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{
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unsigned i;
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uint32_t nr_entries = le32_to_cpu(n->header.nr_entries);
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if (le32_to_cpu(n->header.flags) & INTERNAL_NODE)
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for (i = 0; i < nr_entries; i++)
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dm_tm_inc(tm, value64(n, i));
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else if (vt->inc)
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for (i = 0; i < nr_entries; i++)
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vt->inc(vt->context, value_ptr(n, i));
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}
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static int insert_at(size_t value_size, struct node *node, unsigned index,
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uint64_t key, void *value)
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__dm_written_to_disk(value)
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{
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uint32_t nr_entries = le32_to_cpu(node->header.nr_entries);
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__le64 key_le = cpu_to_le64(key);
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if (index > nr_entries ||
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index >= le32_to_cpu(node->header.max_entries)) {
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DMERR("too many entries in btree node for insert");
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__dm_unbless_for_disk(value);
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return -ENOMEM;
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}
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__dm_bless_for_disk(&key_le);
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array_insert(node->keys, sizeof(*node->keys), nr_entries, index, &key_le);
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array_insert(value_base(node), value_size, nr_entries, index, value);
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node->header.nr_entries = cpu_to_le32(nr_entries + 1);
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return 0;
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}
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/*----------------------------------------------------------------*/
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/*
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* We want 3n entries (for some n). This works more nicely for repeated
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* insert remove loops than (2n + 1).
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*/
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static uint32_t calc_max_entries(size_t value_size, size_t block_size)
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{
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uint32_t total, n;
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size_t elt_size = sizeof(uint64_t) + value_size; /* key + value */
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block_size -= sizeof(struct node_header);
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total = block_size / elt_size;
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n = total / 3; /* rounds down */
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return 3 * n;
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}
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int dm_btree_empty(struct dm_btree_info *info, dm_block_t *root)
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{
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int r;
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struct dm_block *b;
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struct node *n;
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size_t block_size;
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uint32_t max_entries;
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r = new_block(info, &b);
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if (r < 0)
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return r;
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block_size = dm_bm_block_size(dm_tm_get_bm(info->tm));
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max_entries = calc_max_entries(info->value_type.size, block_size);
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n = dm_block_data(b);
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memset(n, 0, block_size);
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n->header.flags = cpu_to_le32(LEAF_NODE);
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n->header.nr_entries = cpu_to_le32(0);
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n->header.max_entries = cpu_to_le32(max_entries);
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n->header.value_size = cpu_to_le32(info->value_type.size);
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*root = dm_block_location(b);
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return unlock_block(info, b);
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}
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EXPORT_SYMBOL_GPL(dm_btree_empty);
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/*----------------------------------------------------------------*/
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/*
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* Deletion uses a recursive algorithm, since we have limited stack space
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* we explicitly manage our own stack on the heap.
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*/
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#define MAX_SPINE_DEPTH 64
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struct frame {
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struct dm_block *b;
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struct node *n;
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unsigned level;
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unsigned nr_children;
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unsigned current_child;
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};
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struct del_stack {
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struct dm_transaction_manager *tm;
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int top;
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struct frame spine[MAX_SPINE_DEPTH];
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};
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static int top_frame(struct del_stack *s, struct frame **f)
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{
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if (s->top < 0) {
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DMERR("btree deletion stack empty");
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return -EINVAL;
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}
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*f = s->spine + s->top;
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return 0;
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}
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static int unprocessed_frames(struct del_stack *s)
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{
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return s->top >= 0;
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}
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static int push_frame(struct del_stack *s, dm_block_t b, unsigned level)
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{
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int r;
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uint32_t ref_count;
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if (s->top >= MAX_SPINE_DEPTH - 1) {
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DMERR("btree deletion stack out of memory");
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return -ENOMEM;
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}
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r = dm_tm_ref(s->tm, b, &ref_count);
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if (r)
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return r;
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if (ref_count > 1)
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/*
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* This is a shared node, so we can just decrement it's
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* reference counter and leave the children.
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*/
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dm_tm_dec(s->tm, b);
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else {
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struct frame *f = s->spine + ++s->top;
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r = dm_tm_read_lock(s->tm, b, &btree_node_validator, &f->b);
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if (r) {
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s->top--;
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return r;
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}
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f->n = dm_block_data(f->b);
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f->level = level;
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f->nr_children = le32_to_cpu(f->n->header.nr_entries);
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f->current_child = 0;
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}
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return 0;
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}
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static void pop_frame(struct del_stack *s)
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{
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struct frame *f = s->spine + s->top--;
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dm_tm_dec(s->tm, dm_block_location(f->b));
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dm_tm_unlock(s->tm, f->b);
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}
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int dm_btree_del(struct dm_btree_info *info, dm_block_t root)
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{
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int r;
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struct del_stack *s;
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s = kmalloc(sizeof(*s), GFP_KERNEL);
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if (!s)
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return -ENOMEM;
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s->tm = info->tm;
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s->top = -1;
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r = push_frame(s, root, 1);
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if (r)
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goto out;
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while (unprocessed_frames(s)) {
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uint32_t flags;
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struct frame *f;
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dm_block_t b;
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r = top_frame(s, &f);
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if (r)
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goto out;
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if (f->current_child >= f->nr_children) {
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pop_frame(s);
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continue;
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}
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flags = le32_to_cpu(f->n->header.flags);
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if (flags & INTERNAL_NODE) {
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b = value64(f->n, f->current_child);
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f->current_child++;
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r = push_frame(s, b, f->level);
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if (r)
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goto out;
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} else if (f->level != (info->levels - 1)) {
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b = value64(f->n, f->current_child);
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f->current_child++;
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r = push_frame(s, b, f->level + 1);
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if (r)
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goto out;
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} else {
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if (info->value_type.dec) {
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unsigned i;
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for (i = 0; i < f->nr_children; i++)
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info->value_type.dec(info->value_type.context,
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value_ptr(f->n, i));
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}
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f->current_child = f->nr_children;
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}
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}
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out:
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kfree(s);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_btree_del);
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/*----------------------------------------------------------------*/
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static int btree_lookup_raw(struct ro_spine *s, dm_block_t block, uint64_t key,
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int (*search_fn)(struct node *, uint64_t),
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uint64_t *result_key, void *v, size_t value_size)
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{
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int i, r;
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uint32_t flags, nr_entries;
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do {
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r = ro_step(s, block);
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if (r < 0)
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return r;
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i = search_fn(ro_node(s), key);
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flags = le32_to_cpu(ro_node(s)->header.flags);
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nr_entries = le32_to_cpu(ro_node(s)->header.nr_entries);
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if (i < 0 || i >= nr_entries)
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return -ENODATA;
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if (flags & INTERNAL_NODE)
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block = value64(ro_node(s), i);
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} while (!(flags & LEAF_NODE));
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*result_key = le64_to_cpu(ro_node(s)->keys[i]);
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memcpy(v, value_ptr(ro_node(s), i), value_size);
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return 0;
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}
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int dm_btree_lookup(struct dm_btree_info *info, dm_block_t root,
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uint64_t *keys, void *value_le)
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{
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unsigned level, last_level = info->levels - 1;
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int r = -ENODATA;
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uint64_t rkey;
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__le64 internal_value_le;
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struct ro_spine spine;
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init_ro_spine(&spine, info);
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for (level = 0; level < info->levels; level++) {
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size_t size;
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void *value_p;
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if (level == last_level) {
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value_p = value_le;
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size = info->value_type.size;
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} else {
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value_p = &internal_value_le;
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size = sizeof(uint64_t);
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}
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r = btree_lookup_raw(&spine, root, keys[level],
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lower_bound, &rkey,
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value_p, size);
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if (!r) {
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if (rkey != keys[level]) {
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exit_ro_spine(&spine);
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return -ENODATA;
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}
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} else {
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exit_ro_spine(&spine);
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return r;
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}
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root = le64_to_cpu(internal_value_le);
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}
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exit_ro_spine(&spine);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_btree_lookup);
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/*
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* Splits a node by creating a sibling node and shifting half the nodes
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* contents across. Assumes there is a parent node, and it has room for
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* another child.
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*
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* Before:
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* +--------+
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* | Parent |
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* +--------+
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* |
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* v
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* +----------+
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* | A ++++++ |
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* +----------+
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*
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*
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* After:
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* +--------+
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* | Parent |
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* +--------+
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* | |
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* v +------+
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* +---------+ |
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* | A* +++ | v
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* +---------+ +-------+
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* | B +++ |
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* +-------+
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*
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* Where A* is a shadow of A.
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*/
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static int btree_split_sibling(struct shadow_spine *s, dm_block_t root,
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unsigned parent_index, uint64_t key)
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{
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int r;
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size_t size;
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unsigned nr_left, nr_right;
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struct dm_block *left, *right, *parent;
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struct node *ln, *rn, *pn;
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__le64 location;
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left = shadow_current(s);
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r = new_block(s->info, &right);
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if (r < 0)
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return r;
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ln = dm_block_data(left);
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rn = dm_block_data(right);
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nr_left = le32_to_cpu(ln->header.nr_entries) / 2;
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nr_right = le32_to_cpu(ln->header.nr_entries) - nr_left;
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ln->header.nr_entries = cpu_to_le32(nr_left);
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rn->header.flags = ln->header.flags;
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rn->header.nr_entries = cpu_to_le32(nr_right);
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rn->header.max_entries = ln->header.max_entries;
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rn->header.value_size = ln->header.value_size;
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memcpy(rn->keys, ln->keys + nr_left, nr_right * sizeof(rn->keys[0]));
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size = le32_to_cpu(ln->header.flags) & INTERNAL_NODE ?
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sizeof(uint64_t) : s->info->value_type.size;
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memcpy(value_ptr(rn, 0), value_ptr(ln, nr_left),
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size * nr_right);
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/*
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* Patch up the parent
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*/
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parent = shadow_parent(s);
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pn = dm_block_data(parent);
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location = cpu_to_le64(dm_block_location(left));
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__dm_bless_for_disk(&location);
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memcpy_disk(value_ptr(pn, parent_index),
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&location, sizeof(__le64));
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location = cpu_to_le64(dm_block_location(right));
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__dm_bless_for_disk(&location);
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r = insert_at(sizeof(__le64), pn, parent_index + 1,
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le64_to_cpu(rn->keys[0]), &location);
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if (r)
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return r;
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if (key < le64_to_cpu(rn->keys[0])) {
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unlock_block(s->info, right);
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s->nodes[1] = left;
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} else {
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unlock_block(s->info, left);
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s->nodes[1] = right;
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}
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return 0;
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}
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/*
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* Splits a node by creating two new children beneath the given node.
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*
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* Before:
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* +----------+
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* | A ++++++ |
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* +----------+
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*
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*
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* After:
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* +------------+
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* | A (shadow) |
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* +------------+
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* | |
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* +------+ +----+
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* | |
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* v v
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* +-------+ +-------+
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* | B +++ | | C +++ |
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* +-------+ +-------+
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*/
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static int btree_split_beneath(struct shadow_spine *s, uint64_t key)
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{
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int r;
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size_t size;
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unsigned nr_left, nr_right;
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struct dm_block *left, *right, *new_parent;
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struct node *pn, *ln, *rn;
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__le64 val;
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new_parent = shadow_current(s);
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r = new_block(s->info, &left);
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if (r < 0)
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return r;
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r = new_block(s->info, &right);
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if (r < 0) {
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/* FIXME: put left */
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return r;
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}
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pn = dm_block_data(new_parent);
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ln = dm_block_data(left);
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rn = dm_block_data(right);
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nr_left = le32_to_cpu(pn->header.nr_entries) / 2;
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nr_right = le32_to_cpu(pn->header.nr_entries) - nr_left;
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ln->header.flags = pn->header.flags;
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ln->header.nr_entries = cpu_to_le32(nr_left);
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ln->header.max_entries = pn->header.max_entries;
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ln->header.value_size = pn->header.value_size;
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rn->header.flags = pn->header.flags;
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rn->header.nr_entries = cpu_to_le32(nr_right);
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rn->header.max_entries = pn->header.max_entries;
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rn->header.value_size = pn->header.value_size;
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memcpy(ln->keys, pn->keys, nr_left * sizeof(pn->keys[0]));
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memcpy(rn->keys, pn->keys + nr_left, nr_right * sizeof(pn->keys[0]));
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size = le32_to_cpu(pn->header.flags) & INTERNAL_NODE ?
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sizeof(__le64) : s->info->value_type.size;
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memcpy(value_ptr(ln, 0), value_ptr(pn, 0), nr_left * size);
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memcpy(value_ptr(rn, 0), value_ptr(pn, nr_left),
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nr_right * size);
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/* new_parent should just point to l and r now */
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pn->header.flags = cpu_to_le32(INTERNAL_NODE);
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pn->header.nr_entries = cpu_to_le32(2);
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pn->header.max_entries = cpu_to_le32(
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calc_max_entries(sizeof(__le64),
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dm_bm_block_size(
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dm_tm_get_bm(s->info->tm))));
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|
pn->header.value_size = cpu_to_le32(sizeof(__le64));
|
|
|
|
val = cpu_to_le64(dm_block_location(left));
|
|
__dm_bless_for_disk(&val);
|
|
pn->keys[0] = ln->keys[0];
|
|
memcpy_disk(value_ptr(pn, 0), &val, sizeof(__le64));
|
|
|
|
val = cpu_to_le64(dm_block_location(right));
|
|
__dm_bless_for_disk(&val);
|
|
pn->keys[1] = rn->keys[0];
|
|
memcpy_disk(value_ptr(pn, 1), &val, sizeof(__le64));
|
|
|
|
/*
|
|
* rejig the spine. This is ugly, since it knows too
|
|
* much about the spine
|
|
*/
|
|
if (s->nodes[0] != new_parent) {
|
|
unlock_block(s->info, s->nodes[0]);
|
|
s->nodes[0] = new_parent;
|
|
}
|
|
if (key < le64_to_cpu(rn->keys[0])) {
|
|
unlock_block(s->info, right);
|
|
s->nodes[1] = left;
|
|
} else {
|
|
unlock_block(s->info, left);
|
|
s->nodes[1] = right;
|
|
}
|
|
s->count = 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btree_insert_raw(struct shadow_spine *s, dm_block_t root,
|
|
struct dm_btree_value_type *vt,
|
|
uint64_t key, unsigned *index)
|
|
{
|
|
int r, i = *index, top = 1;
|
|
struct node *node;
|
|
|
|
for (;;) {
|
|
r = shadow_step(s, root, vt);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
node = dm_block_data(shadow_current(s));
|
|
|
|
/*
|
|
* We have to patch up the parent node, ugly, but I don't
|
|
* see a way to do this automatically as part of the spine
|
|
* op.
|
|
*/
|
|
if (shadow_has_parent(s) && i >= 0) { /* FIXME: second clause unness. */
|
|
__le64 location = cpu_to_le64(dm_block_location(shadow_current(s)));
|
|
|
|
__dm_bless_for_disk(&location);
|
|
memcpy_disk(value_ptr(dm_block_data(shadow_parent(s)), i),
|
|
&location, sizeof(__le64));
|
|
}
|
|
|
|
node = dm_block_data(shadow_current(s));
|
|
|
|
if (node->header.nr_entries == node->header.max_entries) {
|
|
if (top)
|
|
r = btree_split_beneath(s, key);
|
|
else
|
|
r = btree_split_sibling(s, root, i, key);
|
|
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
node = dm_block_data(shadow_current(s));
|
|
|
|
i = lower_bound(node, key);
|
|
|
|
if (le32_to_cpu(node->header.flags) & LEAF_NODE)
|
|
break;
|
|
|
|
if (i < 0) {
|
|
/* change the bounds on the lowest key */
|
|
node->keys[0] = cpu_to_le64(key);
|
|
i = 0;
|
|
}
|
|
|
|
root = value64(node, i);
|
|
top = 0;
|
|
}
|
|
|
|
if (i < 0 || le64_to_cpu(node->keys[i]) != key)
|
|
i++;
|
|
|
|
*index = i;
|
|
return 0;
|
|
}
|
|
|
|
static int insert(struct dm_btree_info *info, dm_block_t root,
|
|
uint64_t *keys, void *value, dm_block_t *new_root,
|
|
int *inserted)
|
|
__dm_written_to_disk(value)
|
|
{
|
|
int r, need_insert;
|
|
unsigned level, index = -1, last_level = info->levels - 1;
|
|
dm_block_t block = root;
|
|
struct shadow_spine spine;
|
|
struct node *n;
|
|
struct dm_btree_value_type le64_type;
|
|
|
|
le64_type.context = NULL;
|
|
le64_type.size = sizeof(__le64);
|
|
le64_type.inc = NULL;
|
|
le64_type.dec = NULL;
|
|
le64_type.equal = NULL;
|
|
|
|
init_shadow_spine(&spine, info);
|
|
|
|
for (level = 0; level < (info->levels - 1); level++) {
|
|
r = btree_insert_raw(&spine, block, &le64_type, keys[level], &index);
|
|
if (r < 0)
|
|
goto bad;
|
|
|
|
n = dm_block_data(shadow_current(&spine));
|
|
need_insert = ((index >= le32_to_cpu(n->header.nr_entries)) ||
|
|
(le64_to_cpu(n->keys[index]) != keys[level]));
|
|
|
|
if (need_insert) {
|
|
dm_block_t new_tree;
|
|
__le64 new_le;
|
|
|
|
r = dm_btree_empty(info, &new_tree);
|
|
if (r < 0)
|
|
goto bad;
|
|
|
|
new_le = cpu_to_le64(new_tree);
|
|
__dm_bless_for_disk(&new_le);
|
|
|
|
r = insert_at(sizeof(uint64_t), n, index,
|
|
keys[level], &new_le);
|
|
if (r)
|
|
goto bad;
|
|
}
|
|
|
|
if (level < last_level)
|
|
block = value64(n, index);
|
|
}
|
|
|
|
r = btree_insert_raw(&spine, block, &info->value_type,
|
|
keys[level], &index);
|
|
if (r < 0)
|
|
goto bad;
|
|
|
|
n = dm_block_data(shadow_current(&spine));
|
|
need_insert = ((index >= le32_to_cpu(n->header.nr_entries)) ||
|
|
(le64_to_cpu(n->keys[index]) != keys[level]));
|
|
|
|
if (need_insert) {
|
|
if (inserted)
|
|
*inserted = 1;
|
|
|
|
r = insert_at(info->value_type.size, n, index,
|
|
keys[level], value);
|
|
if (r)
|
|
goto bad_unblessed;
|
|
} else {
|
|
if (inserted)
|
|
*inserted = 0;
|
|
|
|
if (info->value_type.dec &&
|
|
(!info->value_type.equal ||
|
|
!info->value_type.equal(
|
|
info->value_type.context,
|
|
value_ptr(n, index),
|
|
value))) {
|
|
info->value_type.dec(info->value_type.context,
|
|
value_ptr(n, index));
|
|
}
|
|
memcpy_disk(value_ptr(n, index),
|
|
value, info->value_type.size);
|
|
}
|
|
|
|
*new_root = shadow_root(&spine);
|
|
exit_shadow_spine(&spine);
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
__dm_unbless_for_disk(value);
|
|
bad_unblessed:
|
|
exit_shadow_spine(&spine);
|
|
return r;
|
|
}
|
|
|
|
int dm_btree_insert(struct dm_btree_info *info, dm_block_t root,
|
|
uint64_t *keys, void *value, dm_block_t *new_root)
|
|
__dm_written_to_disk(value)
|
|
{
|
|
return insert(info, root, keys, value, new_root, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_btree_insert);
|
|
|
|
int dm_btree_insert_notify(struct dm_btree_info *info, dm_block_t root,
|
|
uint64_t *keys, void *value, dm_block_t *new_root,
|
|
int *inserted)
|
|
__dm_written_to_disk(value)
|
|
{
|
|
return insert(info, root, keys, value, new_root, inserted);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_btree_insert_notify);
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int find_highest_key(struct ro_spine *s, dm_block_t block,
|
|
uint64_t *result_key, dm_block_t *next_block)
|
|
{
|
|
int i, r;
|
|
uint32_t flags;
|
|
|
|
do {
|
|
r = ro_step(s, block);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
flags = le32_to_cpu(ro_node(s)->header.flags);
|
|
i = le32_to_cpu(ro_node(s)->header.nr_entries);
|
|
if (!i)
|
|
return -ENODATA;
|
|
else
|
|
i--;
|
|
|
|
*result_key = le64_to_cpu(ro_node(s)->keys[i]);
|
|
if (next_block || flags & INTERNAL_NODE)
|
|
block = value64(ro_node(s), i);
|
|
|
|
} while (flags & INTERNAL_NODE);
|
|
|
|
if (next_block)
|
|
*next_block = block;
|
|
return 0;
|
|
}
|
|
|
|
int dm_btree_find_highest_key(struct dm_btree_info *info, dm_block_t root,
|
|
uint64_t *result_keys)
|
|
{
|
|
int r = 0, count = 0, level;
|
|
struct ro_spine spine;
|
|
|
|
init_ro_spine(&spine, info);
|
|
for (level = 0; level < info->levels; level++) {
|
|
r = find_highest_key(&spine, root, result_keys + level,
|
|
level == info->levels - 1 ? NULL : &root);
|
|
if (r == -ENODATA) {
|
|
r = 0;
|
|
break;
|
|
|
|
} else if (r)
|
|
break;
|
|
|
|
count++;
|
|
}
|
|
exit_ro_spine(&spine);
|
|
|
|
return r ? r : count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_btree_find_highest_key);
|