2011-11-01 00:19:11 +04:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2011 Red Hat, Inc.
|
|
|
|
*
|
|
|
|
* This file is released under the GPL.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "dm-btree-internal.h"
|
|
|
|
#include "dm-transaction-manager.h"
|
|
|
|
|
|
|
|
#include <linux/device-mapper.h>
|
|
|
|
|
|
|
|
#define DM_MSG_PREFIX "btree spine"
|
|
|
|
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
|
|
|
|
#define BTREE_CSUM_XOR 121107
|
|
|
|
|
|
|
|
static int node_check(struct dm_block_validator *v,
|
|
|
|
struct dm_block *b,
|
|
|
|
size_t block_size);
|
|
|
|
|
|
|
|
static void node_prepare_for_write(struct dm_block_validator *v,
|
|
|
|
struct dm_block *b,
|
|
|
|
size_t block_size)
|
|
|
|
{
|
2012-12-22 00:23:30 +04:00
|
|
|
struct btree_node *n = dm_block_data(b);
|
2011-11-01 00:19:11 +04:00
|
|
|
struct node_header *h = &n->header;
|
|
|
|
|
|
|
|
h->blocknr = cpu_to_le64(dm_block_location(b));
|
|
|
|
h->csum = cpu_to_le32(dm_bm_checksum(&h->flags,
|
|
|
|
block_size - sizeof(__le32),
|
|
|
|
BTREE_CSUM_XOR));
|
|
|
|
|
|
|
|
BUG_ON(node_check(v, b, 4096));
|
|
|
|
}
|
|
|
|
|
|
|
|
static int node_check(struct dm_block_validator *v,
|
|
|
|
struct dm_block *b,
|
|
|
|
size_t block_size)
|
|
|
|
{
|
2012-12-22 00:23:30 +04:00
|
|
|
struct btree_node *n = dm_block_data(b);
|
2011-11-01 00:19:11 +04:00
|
|
|
struct node_header *h = &n->header;
|
|
|
|
size_t value_size;
|
|
|
|
__le32 csum_disk;
|
|
|
|
uint32_t flags;
|
|
|
|
|
|
|
|
if (dm_block_location(b) != le64_to_cpu(h->blocknr)) {
|
2012-12-22 00:23:34 +04:00
|
|
|
DMERR_LIMIT("node_check failed: blocknr %llu != wanted %llu",
|
|
|
|
le64_to_cpu(h->blocknr), dm_block_location(b));
|
2011-11-01 00:19:11 +04:00
|
|
|
return -ENOTBLK;
|
|
|
|
}
|
|
|
|
|
|
|
|
csum_disk = cpu_to_le32(dm_bm_checksum(&h->flags,
|
|
|
|
block_size - sizeof(__le32),
|
|
|
|
BTREE_CSUM_XOR));
|
|
|
|
if (csum_disk != h->csum) {
|
2012-12-22 00:23:34 +04:00
|
|
|
DMERR_LIMIT("node_check failed: csum %u != wanted %u",
|
|
|
|
le32_to_cpu(csum_disk), le32_to_cpu(h->csum));
|
2011-11-01 00:19:11 +04:00
|
|
|
return -EILSEQ;
|
|
|
|
}
|
|
|
|
|
|
|
|
value_size = le32_to_cpu(h->value_size);
|
|
|
|
|
|
|
|
if (sizeof(struct node_header) +
|
|
|
|
(sizeof(__le64) + value_size) * le32_to_cpu(h->max_entries) > block_size) {
|
2012-12-22 00:23:34 +04:00
|
|
|
DMERR_LIMIT("node_check failed: max_entries too large");
|
2011-11-01 00:19:11 +04:00
|
|
|
return -EILSEQ;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (le32_to_cpu(h->nr_entries) > le32_to_cpu(h->max_entries)) {
|
2012-12-22 00:23:34 +04:00
|
|
|
DMERR_LIMIT("node_check failed: too many entries");
|
2011-11-01 00:19:11 +04:00
|
|
|
return -EILSEQ;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The node must be either INTERNAL or LEAF.
|
|
|
|
*/
|
|
|
|
flags = le32_to_cpu(h->flags);
|
|
|
|
if (!(flags & INTERNAL_NODE) && !(flags & LEAF_NODE)) {
|
2012-12-22 00:23:34 +04:00
|
|
|
DMERR_LIMIT("node_check failed: node is neither INTERNAL or LEAF");
|
2011-11-01 00:19:11 +04:00
|
|
|
return -EILSEQ;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct dm_block_validator btree_node_validator = {
|
|
|
|
.name = "btree_node",
|
|
|
|
.prepare_for_write = node_prepare_for_write,
|
|
|
|
.check = node_check
|
|
|
|
};
|
|
|
|
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
|
2014-11-10 18:03:24 +03:00
|
|
|
int bn_read_lock(struct dm_btree_info *info, dm_block_t b,
|
2011-11-01 00:19:11 +04:00
|
|
|
struct dm_block **result)
|
|
|
|
{
|
|
|
|
return dm_tm_read_lock(info->tm, b, &btree_node_validator, result);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int bn_shadow(struct dm_btree_info *info, dm_block_t orig,
|
|
|
|
struct dm_btree_value_type *vt,
|
|
|
|
struct dm_block **result)
|
|
|
|
{
|
|
|
|
int r, inc;
|
|
|
|
|
|
|
|
r = dm_tm_shadow_block(info->tm, orig, &btree_node_validator,
|
|
|
|
result, &inc);
|
|
|
|
if (!r && inc)
|
|
|
|
inc_children(info->tm, dm_block_data(*result), vt);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
int new_block(struct dm_btree_info *info, struct dm_block **result)
|
|
|
|
{
|
|
|
|
return dm_tm_new_block(info->tm, &btree_node_validator, result);
|
|
|
|
}
|
|
|
|
|
2015-10-22 23:46:59 +03:00
|
|
|
void unlock_block(struct dm_btree_info *info, struct dm_block *b)
|
2011-11-01 00:19:11 +04:00
|
|
|
{
|
2015-10-22 23:46:59 +03:00
|
|
|
dm_tm_unlock(info->tm, b);
|
2011-11-01 00:19:11 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
|
|
|
|
void init_ro_spine(struct ro_spine *s, struct dm_btree_info *info)
|
|
|
|
{
|
|
|
|
s->info = info;
|
|
|
|
s->count = 0;
|
|
|
|
s->nodes[0] = NULL;
|
|
|
|
s->nodes[1] = NULL;
|
|
|
|
}
|
|
|
|
|
2020-04-15 14:57:31 +03:00
|
|
|
void exit_ro_spine(struct ro_spine *s)
|
2011-11-01 00:19:11 +04:00
|
|
|
{
|
2020-04-15 14:57:31 +03:00
|
|
|
int i;
|
2011-11-01 00:19:11 +04:00
|
|
|
|
|
|
|
for (i = 0; i < s->count; i++) {
|
2015-10-22 23:46:59 +03:00
|
|
|
unlock_block(s->info, s->nodes[i]);
|
2011-11-01 00:19:11 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int ro_step(struct ro_spine *s, dm_block_t new_child)
|
|
|
|
{
|
|
|
|
int r;
|
|
|
|
|
|
|
|
if (s->count == 2) {
|
2015-10-22 23:46:59 +03:00
|
|
|
unlock_block(s->info, s->nodes[0]);
|
2011-11-01 00:19:11 +04:00
|
|
|
s->nodes[0] = s->nodes[1];
|
|
|
|
s->count--;
|
|
|
|
}
|
|
|
|
|
|
|
|
r = bn_read_lock(s->info, new_child, s->nodes + s->count);
|
|
|
|
if (!r)
|
|
|
|
s->count++;
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
2013-03-02 02:45:50 +04:00
|
|
|
void ro_pop(struct ro_spine *s)
|
|
|
|
{
|
|
|
|
BUG_ON(!s->count);
|
|
|
|
--s->count;
|
|
|
|
unlock_block(s->info, s->nodes[s->count]);
|
|
|
|
}
|
|
|
|
|
2012-12-22 00:23:30 +04:00
|
|
|
struct btree_node *ro_node(struct ro_spine *s)
|
2011-11-01 00:19:11 +04:00
|
|
|
{
|
|
|
|
struct dm_block *block;
|
|
|
|
|
|
|
|
BUG_ON(!s->count);
|
|
|
|
block = s->nodes[s->count - 1];
|
|
|
|
|
|
|
|
return dm_block_data(block);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
|
|
|
|
void init_shadow_spine(struct shadow_spine *s, struct dm_btree_info *info)
|
|
|
|
{
|
|
|
|
s->info = info;
|
|
|
|
s->count = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int exit_shadow_spine(struct shadow_spine *s)
|
|
|
|
{
|
|
|
|
int r = 0, i;
|
|
|
|
|
|
|
|
for (i = 0; i < s->count; i++) {
|
2015-10-22 23:46:59 +03:00
|
|
|
unlock_block(s->info, s->nodes[i]);
|
2011-11-01 00:19:11 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
int shadow_step(struct shadow_spine *s, dm_block_t b,
|
|
|
|
struct dm_btree_value_type *vt)
|
|
|
|
{
|
|
|
|
int r;
|
|
|
|
|
|
|
|
if (s->count == 2) {
|
2015-10-22 23:46:59 +03:00
|
|
|
unlock_block(s->info, s->nodes[0]);
|
2011-11-01 00:19:11 +04:00
|
|
|
s->nodes[0] = s->nodes[1];
|
|
|
|
s->count--;
|
|
|
|
}
|
|
|
|
|
|
|
|
r = bn_shadow(s->info, b, vt, s->nodes + s->count);
|
|
|
|
if (!r) {
|
|
|
|
if (!s->count)
|
|
|
|
s->root = dm_block_location(s->nodes[0]);
|
|
|
|
|
|
|
|
s->count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct dm_block *shadow_current(struct shadow_spine *s)
|
|
|
|
{
|
|
|
|
BUG_ON(!s->count);
|
|
|
|
|
|
|
|
return s->nodes[s->count - 1];
|
|
|
|
}
|
|
|
|
|
|
|
|
struct dm_block *shadow_parent(struct shadow_spine *s)
|
|
|
|
{
|
|
|
|
BUG_ON(s->count != 2);
|
|
|
|
|
|
|
|
return s->count == 2 ? s->nodes[0] : NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
int shadow_has_parent(struct shadow_spine *s)
|
|
|
|
{
|
|
|
|
return s->count >= 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
int shadow_root(struct shadow_spine *s)
|
|
|
|
{
|
|
|
|
return s->root;
|
|
|
|
}
|
2015-08-12 17:12:09 +03:00
|
|
|
|
|
|
|
static void le64_inc(void *context, const void *value_le)
|
|
|
|
{
|
|
|
|
struct dm_transaction_manager *tm = context;
|
|
|
|
__le64 v_le;
|
|
|
|
|
|
|
|
memcpy(&v_le, value_le, sizeof(v_le));
|
|
|
|
dm_tm_inc(tm, le64_to_cpu(v_le));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void le64_dec(void *context, const void *value_le)
|
|
|
|
{
|
|
|
|
struct dm_transaction_manager *tm = context;
|
|
|
|
__le64 v_le;
|
|
|
|
|
|
|
|
memcpy(&v_le, value_le, sizeof(v_le));
|
|
|
|
dm_tm_dec(tm, le64_to_cpu(v_le));
|
|
|
|
}
|
|
|
|
|
|
|
|
static int le64_equal(void *context, const void *value1_le, const void *value2_le)
|
|
|
|
{
|
|
|
|
__le64 v1_le, v2_le;
|
|
|
|
|
|
|
|
memcpy(&v1_le, value1_le, sizeof(v1_le));
|
|
|
|
memcpy(&v2_le, value2_le, sizeof(v2_le));
|
|
|
|
return v1_le == v2_le;
|
|
|
|
}
|
|
|
|
|
|
|
|
void init_le64_type(struct dm_transaction_manager *tm,
|
|
|
|
struct dm_btree_value_type *vt)
|
|
|
|
{
|
|
|
|
vt->context = tm;
|
|
|
|
vt->size = sizeof(__le64);
|
|
|
|
vt->inc = le64_inc;
|
|
|
|
vt->dec = le64_dec;
|
|
|
|
vt->equal = le64_equal;
|
|
|
|
}
|