439 lines
9.3 KiB
C
439 lines
9.3 KiB
C
/*
|
|
* Copyright (C) 2011 Red Hat, Inc.
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#include "dm-space-map-checker.h"
|
|
|
|
#include <linux/device-mapper.h>
|
|
#include <linux/export.h>
|
|
|
|
#ifdef CONFIG_DM_DEBUG_SPACE_MAPS
|
|
|
|
#define DM_MSG_PREFIX "space map checker"
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
struct count_array {
|
|
dm_block_t nr;
|
|
dm_block_t nr_free;
|
|
|
|
uint32_t *counts;
|
|
};
|
|
|
|
static int ca_get_count(struct count_array *ca, dm_block_t b, uint32_t *count)
|
|
{
|
|
if (b >= ca->nr)
|
|
return -EINVAL;
|
|
|
|
*count = ca->counts[b];
|
|
return 0;
|
|
}
|
|
|
|
static int ca_count_more_than_one(struct count_array *ca, dm_block_t b, int *r)
|
|
{
|
|
if (b >= ca->nr)
|
|
return -EINVAL;
|
|
|
|
*r = ca->counts[b] > 1;
|
|
return 0;
|
|
}
|
|
|
|
static int ca_set_count(struct count_array *ca, dm_block_t b, uint32_t count)
|
|
{
|
|
uint32_t old_count;
|
|
|
|
if (b >= ca->nr)
|
|
return -EINVAL;
|
|
|
|
old_count = ca->counts[b];
|
|
|
|
if (!count && old_count)
|
|
ca->nr_free++;
|
|
|
|
else if (count && !old_count)
|
|
ca->nr_free--;
|
|
|
|
ca->counts[b] = count;
|
|
return 0;
|
|
}
|
|
|
|
static int ca_inc_block(struct count_array *ca, dm_block_t b)
|
|
{
|
|
if (b >= ca->nr)
|
|
return -EINVAL;
|
|
|
|
ca_set_count(ca, b, ca->counts[b] + 1);
|
|
return 0;
|
|
}
|
|
|
|
static int ca_dec_block(struct count_array *ca, dm_block_t b)
|
|
{
|
|
if (b >= ca->nr)
|
|
return -EINVAL;
|
|
|
|
BUG_ON(ca->counts[b] == 0);
|
|
ca_set_count(ca, b, ca->counts[b] - 1);
|
|
return 0;
|
|
}
|
|
|
|
static int ca_create(struct count_array *ca, struct dm_space_map *sm)
|
|
{
|
|
int r;
|
|
dm_block_t nr_blocks;
|
|
|
|
r = dm_sm_get_nr_blocks(sm, &nr_blocks);
|
|
if (r)
|
|
return r;
|
|
|
|
ca->nr = nr_blocks;
|
|
ca->nr_free = nr_blocks;
|
|
ca->counts = kzalloc(sizeof(*ca->counts) * nr_blocks, GFP_KERNEL);
|
|
if (!ca->counts)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ca_load(struct count_array *ca, struct dm_space_map *sm)
|
|
{
|
|
int r;
|
|
uint32_t count;
|
|
dm_block_t nr_blocks, i;
|
|
|
|
r = dm_sm_get_nr_blocks(sm, &nr_blocks);
|
|
if (r)
|
|
return r;
|
|
|
|
BUG_ON(ca->nr != nr_blocks);
|
|
|
|
DMWARN("Loading debug space map from disk. This may take some time");
|
|
for (i = 0; i < nr_blocks; i++) {
|
|
r = dm_sm_get_count(sm, i, &count);
|
|
if (r) {
|
|
DMERR("load failed");
|
|
return r;
|
|
}
|
|
|
|
ca_set_count(ca, i, count);
|
|
}
|
|
DMWARN("Load complete");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ca_extend(struct count_array *ca, dm_block_t extra_blocks)
|
|
{
|
|
dm_block_t nr_blocks = ca->nr + extra_blocks;
|
|
uint32_t *counts = kzalloc(sizeof(*counts) * nr_blocks, GFP_KERNEL);
|
|
if (!counts)
|
|
return -ENOMEM;
|
|
|
|
memcpy(counts, ca->counts, sizeof(*counts) * ca->nr);
|
|
kfree(ca->counts);
|
|
ca->nr = nr_blocks;
|
|
ca->nr_free += extra_blocks;
|
|
ca->counts = counts;
|
|
return 0;
|
|
}
|
|
|
|
static int ca_commit(struct count_array *old, struct count_array *new)
|
|
{
|
|
if (old->nr != new->nr) {
|
|
BUG_ON(old->nr > new->nr);
|
|
ca_extend(old, new->nr - old->nr);
|
|
}
|
|
|
|
BUG_ON(old->nr != new->nr);
|
|
old->nr_free = new->nr_free;
|
|
memcpy(old->counts, new->counts, sizeof(*old->counts) * old->nr);
|
|
return 0;
|
|
}
|
|
|
|
static void ca_destroy(struct count_array *ca)
|
|
{
|
|
kfree(ca->counts);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
struct sm_checker {
|
|
struct dm_space_map sm;
|
|
|
|
struct count_array old_counts;
|
|
struct count_array counts;
|
|
|
|
struct dm_space_map *real_sm;
|
|
};
|
|
|
|
static void sm_checker_destroy(struct dm_space_map *sm)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
|
|
dm_sm_destroy(smc->real_sm);
|
|
ca_destroy(&smc->old_counts);
|
|
ca_destroy(&smc->counts);
|
|
kfree(smc);
|
|
}
|
|
|
|
static int sm_checker_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r = dm_sm_get_nr_blocks(smc->real_sm, count);
|
|
if (!r)
|
|
BUG_ON(smc->old_counts.nr != *count);
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r = dm_sm_get_nr_free(smc->real_sm, count);
|
|
if (!r) {
|
|
/*
|
|
* Slow, but we know it's correct.
|
|
*/
|
|
dm_block_t b, n = 0;
|
|
for (b = 0; b < smc->old_counts.nr; b++)
|
|
if (smc->old_counts.counts[b] == 0 &&
|
|
smc->counts.counts[b] == 0)
|
|
n++;
|
|
|
|
if (n != *count)
|
|
DMERR("free block counts differ, checker %u, sm-disk:%u",
|
|
(unsigned) n, (unsigned) *count);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_new_block(struct dm_space_map *sm, dm_block_t *b)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r = dm_sm_new_block(smc->real_sm, b);
|
|
|
|
if (!r) {
|
|
BUG_ON(*b >= smc->old_counts.nr);
|
|
BUG_ON(smc->old_counts.counts[*b] != 0);
|
|
BUG_ON(*b >= smc->counts.nr);
|
|
BUG_ON(smc->counts.counts[*b] != 0);
|
|
ca_set_count(&smc->counts, *b, 1);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_inc_block(struct dm_space_map *sm, dm_block_t b)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r = dm_sm_inc_block(smc->real_sm, b);
|
|
int r2 = ca_inc_block(&smc->counts, b);
|
|
BUG_ON(r != r2);
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_dec_block(struct dm_space_map *sm, dm_block_t b)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r = dm_sm_dec_block(smc->real_sm, b);
|
|
int r2 = ca_dec_block(&smc->counts, b);
|
|
BUG_ON(r != r2);
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_get_count(struct dm_space_map *sm, dm_block_t b, uint32_t *result)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
uint32_t result2 = 0;
|
|
int r = dm_sm_get_count(smc->real_sm, b, result);
|
|
int r2 = ca_get_count(&smc->counts, b, &result2);
|
|
|
|
BUG_ON(r != r2);
|
|
if (!r)
|
|
BUG_ON(*result != result2);
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_count_more_than_one(struct dm_space_map *sm, dm_block_t b, int *result)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int result2 = 0;
|
|
int r = dm_sm_count_is_more_than_one(smc->real_sm, b, result);
|
|
int r2 = ca_count_more_than_one(&smc->counts, b, &result2);
|
|
|
|
BUG_ON(r != r2);
|
|
if (!r)
|
|
BUG_ON(!(*result) && result2);
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_set_count(struct dm_space_map *sm, dm_block_t b, uint32_t count)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
uint32_t old_rc;
|
|
int r = dm_sm_set_count(smc->real_sm, b, count);
|
|
int r2;
|
|
|
|
BUG_ON(b >= smc->counts.nr);
|
|
old_rc = smc->counts.counts[b];
|
|
r2 = ca_set_count(&smc->counts, b, count);
|
|
BUG_ON(r != r2);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int sm_checker_commit(struct dm_space_map *sm)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r;
|
|
|
|
r = dm_sm_commit(smc->real_sm);
|
|
if (r)
|
|
return r;
|
|
|
|
r = ca_commit(&smc->old_counts, &smc->counts);
|
|
if (r)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_checker_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
int r = dm_sm_extend(smc->real_sm, extra_blocks);
|
|
if (r)
|
|
return r;
|
|
|
|
return ca_extend(&smc->counts, extra_blocks);
|
|
}
|
|
|
|
static int sm_checker_root_size(struct dm_space_map *sm, size_t *result)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
return dm_sm_root_size(smc->real_sm, result);
|
|
}
|
|
|
|
static int sm_checker_copy_root(struct dm_space_map *sm, void *copy_to_here_le, size_t len)
|
|
{
|
|
struct sm_checker *smc = container_of(sm, struct sm_checker, sm);
|
|
return dm_sm_copy_root(smc->real_sm, copy_to_here_le, len);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static struct dm_space_map ops_ = {
|
|
.destroy = sm_checker_destroy,
|
|
.get_nr_blocks = sm_checker_get_nr_blocks,
|
|
.get_nr_free = sm_checker_get_nr_free,
|
|
.inc_block = sm_checker_inc_block,
|
|
.dec_block = sm_checker_dec_block,
|
|
.new_block = sm_checker_new_block,
|
|
.get_count = sm_checker_get_count,
|
|
.count_is_more_than_one = sm_checker_count_more_than_one,
|
|
.set_count = sm_checker_set_count,
|
|
.commit = sm_checker_commit,
|
|
.extend = sm_checker_extend,
|
|
.root_size = sm_checker_root_size,
|
|
.copy_root = sm_checker_copy_root
|
|
};
|
|
|
|
struct dm_space_map *dm_sm_checker_create(struct dm_space_map *sm)
|
|
{
|
|
int r;
|
|
struct sm_checker *smc;
|
|
|
|
if (!sm)
|
|
return NULL;
|
|
|
|
smc = kmalloc(sizeof(*smc), GFP_KERNEL);
|
|
if (!smc)
|
|
return NULL;
|
|
|
|
memcpy(&smc->sm, &ops_, sizeof(smc->sm));
|
|
r = ca_create(&smc->old_counts, sm);
|
|
if (r) {
|
|
kfree(smc);
|
|
return NULL;
|
|
}
|
|
|
|
r = ca_create(&smc->counts, sm);
|
|
if (r) {
|
|
ca_destroy(&smc->old_counts);
|
|
kfree(smc);
|
|
return NULL;
|
|
}
|
|
|
|
smc->real_sm = sm;
|
|
|
|
r = ca_load(&smc->counts, sm);
|
|
if (r) {
|
|
ca_destroy(&smc->counts);
|
|
ca_destroy(&smc->old_counts);
|
|
kfree(smc);
|
|
return NULL;
|
|
}
|
|
|
|
r = ca_commit(&smc->old_counts, &smc->counts);
|
|
if (r) {
|
|
ca_destroy(&smc->counts);
|
|
ca_destroy(&smc->old_counts);
|
|
kfree(smc);
|
|
return NULL;
|
|
}
|
|
|
|
return &smc->sm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_sm_checker_create);
|
|
|
|
struct dm_space_map *dm_sm_checker_create_fresh(struct dm_space_map *sm)
|
|
{
|
|
int r;
|
|
struct sm_checker *smc;
|
|
|
|
if (!sm)
|
|
return NULL;
|
|
|
|
smc = kmalloc(sizeof(*smc), GFP_KERNEL);
|
|
if (!smc)
|
|
return NULL;
|
|
|
|
memcpy(&smc->sm, &ops_, sizeof(smc->sm));
|
|
r = ca_create(&smc->old_counts, sm);
|
|
if (r) {
|
|
kfree(smc);
|
|
return NULL;
|
|
}
|
|
|
|
r = ca_create(&smc->counts, sm);
|
|
if (r) {
|
|
ca_destroy(&smc->old_counts);
|
|
kfree(smc);
|
|
return NULL;
|
|
}
|
|
|
|
smc->real_sm = sm;
|
|
return &smc->sm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_sm_checker_create_fresh);
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
#else
|
|
|
|
struct dm_space_map *dm_sm_checker_create(struct dm_space_map *sm)
|
|
{
|
|
return sm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_sm_checker_create);
|
|
|
|
struct dm_space_map *dm_sm_checker_create_fresh(struct dm_space_map *sm)
|
|
{
|
|
return sm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_sm_checker_create_fresh);
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
#endif
|