/*
* Copyright (C) 2012 Red Hat, Inc.
*
* This file is released under the GPL.
*/
#include "dm-cache-metadata.h"
#include "persistent-data/dm-array.h"
#include "persistent-data/dm-bitset.h"
#include "persistent-data/dm-space-map.h"
#include "persistent-data/dm-space-map-disk.h"
#include "persistent-data/dm-transaction-manager.h"
#include <linux/device-mapper.h>
/*----------------------------------------------------------------*/
#define DM_MSG_PREFIX "cache metadata"
#define CACHE_SUPERBLOCK_MAGIC 06142003
#define CACHE_SUPERBLOCK_LOCATION 0
#define CACHE_VERSION 1
#define CACHE_METADATA_CACHE_SIZE 64
/*
* 3 for btree insert +
* 2 for btree lookup used within space map
*/
#define CACHE_MAX_CONCURRENT_LOCKS 5
#define SPACE_MAP_ROOT_SIZE 128
enum superblock_flag_bits {
/* for spotting crashes that would invalidate the dirty bitset */
CLEAN_SHUTDOWN,
};
/*
* Each mapping from cache block -> origin block carries a set of flags.
*/
enum mapping_bits {
/*
* A valid mapping. Because we're using an array we clear this
* flag for an non existant mapping.
*/
M_VALID = 1,
/*
* The data on the cache is different from that on the origin.
*/
M_DIRTY = 2
};
struct cache_disk_superblock {
__le32 csum;
__le32 flags;
__le64 blocknr;
__u8 uuid[16];
__le64 magic;
__le32 version;
__u8 policy_name[CACHE_POLICY_NAME_SIZE];
__le32 policy_hint_size;
__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
__le64 mapping_root;
__le64 hint_root;
__le64 discard_root;
__le64 discard_block_size;
__le64 discard_nr_blocks;
__le32 data_block_size;
__le32 metadata_block_size;
__le32 cache_blocks;
__le32 compat_flags;
__le32 compat_ro_flags;
__le32 incompat_flags;
__le32 read_hits;
__le32 read_misses;
__le32 write_hits;
__le32 write_misses;
} __packed;
struct dm_cache_metadata {
struct block_device *bdev;
struct dm_block_manager *bm;
struct dm_space_map *metadata_sm;
struct dm_transaction_manager *tm;
struct dm_array_info info;
struct dm_array_info hint_info;
struct dm_disk_bitset discard_info;
struct rw_semaphore root_lock;
dm_block_t root;
dm_block_t hint_root;
dm_block_t discard_root;
sector_t discard_block_size;
dm_dblock_t discard_nr_blocks;
sector_t data_block_size;
dm_cblock_t cache_blocks;
bool changed:1;
bool clean_when_opened:1;
char policy_name[CACHE_POLICY_NAME_SIZE];
size_t policy_hint_size;
struct dm_cache_statistics stats;
};
/*-------------------------------------------------------------------
* superblock validator
*-----------------------------------------------------------------*/
#define SUPERBLOCK_CSUM_XOR 9031977
static void sb_prepare_for_write(struct dm_block_validator *v,
struct dm_block *b,
size_t sb_block_size)
{
struct cache_disk_superblock *disk_super = dm_block_data(b);
disk_super->blocknr = cpu_to_le64(dm_block_location(b));
disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
sb_block_size - sizeof(__le32),
SUPERBLOCK_CSUM_XOR));
}
static int sb_check(struct dm_block_validator *v,
struct dm_block *b,
size_t sb_block_size)
{
struct cache_disk_superblock *disk_super = dm_block_data(b);
__le32 csum_le;
if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) {
DMERR("sb_check failed: blocknr %llu: wanted %llu",
le64_to_cpu(disk_super->blocknr),
(unsigned long long)dm_block_location(b));
return -ENOTBLK;
}
if (le64_to_cpu(disk_super->magic) != CACHE_SUPERBLOCK_MAGIC) {
DMERR("sb_check failed: magic %llu: wanted %llu",
le64_to_cpu(disk_super->magic),
(unsigned long long)CACHE_SUPERBLOCK_MAGIC);
return -EILSEQ;
}
csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
sb_block_size - sizeof(__le32),
SUPERBLOCK_CSUM_XOR));
if (csum_le != disk_super->csum) {
DMERR("sb_check failed: csum %u: wanted %u",
le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum));
return -EILSEQ;
}
return 0;
}
static struct dm_block_validator sb_validator = {
.name = "superblock",
.prepare_for_write = sb_prepare_for_write,
.check = sb_check
};
/*----------------------------------------------------------------*/
static int superblock_read_lock(struct dm_cache_metadata *cmd,
struct dm_block **sblock)
{
return dm_bm_read_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
&sb_validator, sblock);
}
static int superblock_lock_zero(struct dm_cache_metadata *cmd,
struct dm_block **sblock)
{
return dm_bm_write_lock_zero(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
&sb_validator, sblock);
}
static int superblock_lock(struct dm_cache_metadata *cmd,
struct dm_block **sblock)
{
return dm_bm_write_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
&sb_validator, sblock);
}
/*----------------------------------------------------------------*/
static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result)
{
int r;
unsigned i;
struct dm_block *b;
__le64 *data_le, zero = cpu_to_le64(0);
unsigned sb_block_size = dm_bm_block_size(bm) / sizeof(__le64);
/*
* We can't use a validator here - it may be all zeroes.
*/
r = dm_bm_read_lock(bm, CACHE_SUPERBLOCK_LOCATION, NULL, &b);
if (r)
return r;
data_le = dm_block_data(b);
*result = 1;
for (i = 0; i < sb_block_size; i++) {
if (data_le[i] != zero) {
*result = 0;
break;
}
}
return dm_bm_unlock(b);
}
static void __setup_mapping_info(struct dm_cache_metadata *cmd)
{
struct dm_btree_value_type vt;
vt.context = NULL;
vt.size = sizeof(__le64);
vt.inc = NULL;
vt.dec = NULL;
vt.equal = NULL;
dm_array_info_init(&cmd->info, cmd->tm, &vt);
if (cmd->policy_hint_size) {
vt.size = sizeof(__le32);
dm_array_info_init(&cmd->hint_info, cmd->tm, &vt);
}
}
static int __write_initial_superblock(struct dm_cache_metadata *cmd)
{
int r;
struct dm_block *sblock;
size_t metadata_len;
struct cache_disk_superblock *disk_super;
sector_t bdev_size = i_size_read(cmd->bdev->bd_inode) >> SECTOR_SHIFT;
/* FIXME: see if we can lose the max sectors limit */
if (bdev_size > DM_CACHE_METADATA_MAX_SECTORS)
bdev_size = DM_CACHE_METADATA_MAX_SECTORS;
r = dm_sm_root_size(cmd->metadata_sm, &metadata_len);
if (r < 0)
return r;
r = dm_tm_pre_commit(cmd->tm);
if (r < 0)
return r;
r = superblock_lock_zero(cmd, &sblock);
if (r)
return r;
disk_super = dm_block_data(sblock);
disk_super->flags = 0;
memset(disk_super->uuid, 0, sizeof(disk_super->uuid));
disk_super->magic = cpu_to_le64(CACHE_SUPERBLOCK_MAGIC);
disk_super->version = cpu_to_le32(CACHE_VERSION);
memset(disk_super->policy_name, 0, CACHE_POLICY_NAME_SIZE);
disk_super->policy_hint_size = 0;
r = dm_sm_copy_root(cmd->metadata_sm, &disk_super->metadata_space_map_root,
metadata_len);
if (r < 0)
goto bad_locked;
disk_super->mapping_root = cpu_to_le64(cmd->root);
disk_super->hint_root = cpu_to_le64(cmd->hint_root);
disk_super->discard_root = cpu_to_le64(cmd->discard_root);
disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);
disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));
disk_super->metadata_block_size = cpu_to_le32(DM_CACHE_METADATA_BLOCK_SIZE >> SECTOR_SHIFT);
disk_super->data_block_size = cpu_to_le32(cmd->data_block_size);
disk_super->cache_blocks = cpu_to_le32(0);
memset(disk_super->policy_name, 0, sizeof(disk_super->policy_name));
disk_super->read_hits = cpu_to_le32(0);
disk_super->read_misses = cpu_to_le32(0);
disk_super->write_hits = cpu_to_le32(0);
disk_super->write_misses = cpu_to_le32(0);
return dm_tm_commit(cmd->tm, sblock);
bad_locked:
dm_bm_unlock(sblock);
return r;
}
static int __format_metadata(struct dm_cache_metadata *cmd)
{
int r;
r = dm_tm_create_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
&cmd->tm, &cmd->metadata_sm);
if (r < 0) {
DMERR("tm_create_with_sm failed");
return r;
}
__setup_mapping_info(cmd);
r = dm_array_empty(&cmd->info, &cmd->root);
if (r < 0)
goto bad;
dm_disk_bitset_init(cmd->tm, &cmd->discard_info);
r = dm_bitset_empty(&cmd->discard_info, &cmd->discard_root);
if (r < 0)
goto bad;
cmd->discard_block_size = 0;
cmd->discard_nr_blocks = 0;
r = __write_initial_superblock(cmd);
if (r)
goto bad;
cmd->clean_when_opened = true;
return 0;
bad:
dm_tm_destroy(cmd->tm);
dm_sm_destroy(cmd->metadata_sm);
return r;
}
static int __check_incompat_features(struct cache_disk_superblock *disk_super,
struct dm_cache_metadata *cmd)
{
uint32_t features;
features = le32_to_cpu(disk_super->incompat_flags) & ~DM_CACHE_FEATURE_INCOMPAT_SUPP;
if (features) {
DMERR("could not access metadata due to unsupported optional features (%lx).",
(unsigned long)features);
return -EINVAL;
}
/*
* Check for read-only metadata to skip the following RDWR checks.
*/
if (get_disk_ro(cmd->bdev->bd_disk))
return 0;
features = le32_to_cpu(disk_super->compat_ro_flags) & ~DM_CACHE_FEATURE_COMPAT_RO_SUPP;
if (features) {
DMERR("could not access metadata RDWR due to unsupported optional features (%lx).",
(unsigned long)features);
return -EINVAL;
}
return 0;
}
static int __open_metadata(struct dm_cache_metadata *cmd)
{
int r;
struct dm_block *sblock;
struct cache_disk_superblock *disk_super;
unsigned long sb_flags;
r = superblock_read_lock(cmd, &sblock);
if (r < 0) {
DMERR("couldn't read lock superblock");
return r;
}
disk_super = dm_block_data(sblock);
r = __check_incompat_features(disk_super, cmd);
if (r < 0)
goto bad;
r = dm_tm_open_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
disk_super->metadata_space_map_root,
sizeof(disk_super->metadata_space_map_root),
&cmd->tm, &cmd->metadata_sm);
if (r < 0) {
DMERR("tm_open_with_sm failed");
goto bad;
}
__setup_mapping_info(cmd);
dm_disk_bitset_init(cmd->tm, &cmd->discard_info);
sb_flags = le32_to_cpu(disk_super->flags);
cmd->clean_when_opened = test_bit(CLEAN_SHUTDOWN, &sb_flags);
return dm_bm_unlock(sblock);
bad:
dm_bm_unlock(sblock);
return r;
}
static int __open_or_format_metadata(struct dm_cache_metadata *cmd,
bool format_device)
{
int r, unformatted;
r = __superblock_all_zeroes(cmd->bm, &unformatted);
if (r)
return r;
if (unformatted)
return format_device ? __format_metadata(cmd) : -EPERM;
return __open_metadata(cmd);
}
static int __create_persistent_data_objects(struct dm_cache_metadata *cmd,
bool may_format_device)
{
int r;
cmd->bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE,
CACHE_METADATA_CACHE_SIZE,
CACHE_MAX_CONCURRENT_LOCKS);
if (IS_ERR(cmd->bm)) {
DMERR("could not create block manager");
return PTR_ERR(cmd->bm);
}
r = __open_or_format_metadata(cmd, may_format_device);
if (r)
dm_block_manager_destroy(cmd->bm);
return r;
}
static void __destroy_persistent_data_objects(struct dm_cache_metadata *cmd)
{
dm_sm_destroy(cmd->metadata_sm);
dm_tm_destroy(cmd->tm);
dm_block_manager_destroy(cmd->bm);
}
typedef unsigned long (*flags_mutator)(unsigned long);
static void update_flags(struct cache_disk_superblock *disk_super,
flags_mutator mutator)
{
uint32_t sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);
}
static unsigned long set_clean_shutdown(unsigned long flags)
{
set_bit(CLEAN_SHUTDOWN, &flags);
return flags;
}
static unsigned long clear_clean_shutdown(unsigned long flags)
{
clear_bit(CLEAN_SHUTDOWN, &flags);
return flags;
}
static void read_superblock_fields(struct dm_cache_metadata *cmd,
struct cache_disk_superblock *disk_super)
{
cmd->root = le64_to_cpu(disk_super->mapping_root);
cmd->hint_root = le64_to_cpu(disk_super->hint_root);
cmd->discard_root = le64_to_cpu(disk_super->discard_root);
cmd->discard_block_size = le64_to_cpu(disk_super->discard_block_size);
cmd->discard_nr_blocks = to_dblock(le64_to_cpu(disk_super->discard_nr_blocks));
cmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
cmd->cache_blocks = to_cblock(le32_to_cpu(disk_super->cache_blocks));
strncpy(cmd->policy_name, disk_super->policy_name, sizeof(cmd->policy_name));
cmd->policy_hint_size = le32_to_cpu(disk_super->policy_hint_size);
cmd->stats.read_hits = le32_to_cpu(disk_super->read_hits);
cmd->stats.read_misses = le32_to_cpu(disk_super->read_misses);
cmd->stats.write_hits = le32_to_cpu(disk_super->write_hits);
cmd->stats.write_misses = le32_to_cpu(disk_super->write_misses);
cmd->changed = false;
}
/*
* The mutator updates the superblock flags.
*/
static int __begin_transaction_flags(struct dm_cache_metadata *cmd,
flags_mutator mutator)
{
int r;
struct cache_disk_superblock *disk_super;
struct dm_block *sblock;
r = superblock_lock(cmd, &sblock);
if (r)
return r;
disk_super = dm_block_data(sblock);
update_flags(disk_super, mutator);
read_superblock_fields(cmd, disk_super);
return dm_bm_flush_and_unlock(cmd->bm, sblock);
}
static int __begin_transaction(struct dm_cache_metadata *cmd)
{
int r;
struct cache_disk_superblock *disk_super;
struct dm_block *sblock;
/*
* We re-read the superblock every time. Shouldn't need to do this
* really.
*/
r = superblock_read_lock(cmd, &sblock);
if (r)
return r;
disk_super = dm_block_data(sblock);
read_superblock_fields(cmd, disk_super);
dm_bm_unlock(sblock);
return 0;
}
static int __commit_transaction(struct dm_cache_metadata *cmd,
flags_mutator mutator)
{
int r;
size_t metadata_len;
struct cache_disk_superblock *disk_super;
struct dm_block *sblock;
/*
* We need to know if the cache_disk_superblock exceeds a 512-byte sector.
*/
BUILD_BUG_ON(sizeof(struct cache_disk_superblock) > 512);
r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root,
&cmd->discard_root);
if (r)
return r;
r = dm_tm_pre_commit(cmd->tm);
if (r < 0)
return r;
r = dm_sm_root_size(cmd->metadata_sm, &metadata_len);
if (r < 0)
return r;
r = superblock_lock(cmd, &sblock);
if (r)
return r;
disk_super = dm_block_data(sblock);
if (mutator)
update_flags(disk_super, mutator);
disk_super->mapping_root = cpu_to_le64(cmd->root);
disk_super->hint_root = cpu_to_le64(cmd->hint_root);
disk_super->discard_root = cpu_to_le64(cmd->discard_root);
disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);
disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));
disk_super->cache_blocks = cpu_to_le32(from_cblock(cmd->cache_blocks));
strncpy(disk_super->policy_name, cmd->policy_name, sizeof(disk_super->policy_name));
disk_super->read_hits = cpu_to_le32(cmd->stats.read_hits);
disk_super->read_misses = cpu_to_le32(cmd->stats.read_misses);
disk_super->write_hits = cpu_to_le32(cmd->stats.write_hits);
disk_super->write_misses = cpu_to_le32(cmd->stats.write_misses);
r = dm_sm_copy_root(cmd->metadata_sm, &disk_super->metadata_space_map_root,
metadata_len);
if (r < 0) {
dm_bm_unlock(sblock);
return r;
}
return dm_tm_commit(cmd->tm, sblock);
}
/*----------------------------------------------------------------*/
/*
* The mappings are held in a dm-array that has 64-bit values stored in
* little-endian format. The index is the cblock, the high 48bits of the
* value are the oblock and the low 16 bit the flags.
*/
#define FLAGS_MASK ((1 << 16) - 1)
static __le64 pack_value(dm_oblock_t block, unsigned flags)
{
uint64_t value = from_oblock(block);
value <<= 16;
value = value | (flags & FLAGS_MASK);
return cpu_to_le64(value);
}
static void unpack_value(__le64 value_le, dm_oblock_t *block, unsigned *flags)
{
uint64_t value = le64_to_cpu(value_le);
uint64_t b = value >> 16;
*block = to_oblock(b);
*flags = value & FLAGS_MASK;
}
/*----------------------------------------------------------------*/
struct dm_cache_metadata *dm_cache_metadata_open(struct block_device *bdev,
sector_t data_block_size,
bool may_format_device,
size_t policy_hint_size)
{
int r;
struct dm_cache_metadata *cmd;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd) {
DMERR("could not allocate metadata struct");
return NULL;
}
init_rwsem(&cmd->root_lock);
cmd->bdev = bdev;
cmd->data_block_size = data_block_size;
cmd->cache_blocks = 0;
cmd->policy_hint_size = policy_hint_size;
cmd->changed = true;
r = __create_persistent_data_objects(cmd, may_format_device);
if (r) {
kfree(cmd);
return ERR_PTR(r);
}
r = __begin_transaction_flags(cmd, clear_clean_shutdown);
if (r < 0) {
dm_cache_metadata_close(cmd);
return ERR_PTR(r);
}
return cmd;
}
void dm_cache_metadata_close(struct dm_cache_metadata *cmd)
{
__destroy_persistent_data_objects(cmd);
kfree(cmd);
}
int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size)
{
int r;
__le64 null_mapping = pack_value(0, 0);
down_write(&cmd->root_lock);
__dm_bless_for_disk(&null_mapping);
r = dm_array_resize(&cmd->info, cmd->root, from_cblock(cmd->cache_blocks),
from_cblock(new_cache_size),
&null_mapping, &cmd->root);
if (!r)
cmd->cache_blocks = new_cache_size;
cmd->changed = true;
up_write(&cmd->root_lock);
return r;
}
int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd,
sector_t discard_block_size,
dm_dblock_t new_nr_entries)
{
int r;
down_write(&cmd->root_lock);
r = dm_bitset_resize(&cmd->discard_info,
cmd->discard_root,
from_dblock(cmd->discard_nr_blocks),
from_dblock(new_nr_entries),
false, &cmd->discard_root);
if (!r) {
cmd->discard_block_size = discard_block_size;
cmd->discard_nr_blocks = new_nr_entries;
}
cmd->changed = true;
up_write(&cmd->root_lock);
return r;
}
static int __set_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
{
return dm_bitset_set_bit(&cmd->discard_info, cmd->discard_root,
from_dblock(b), &cmd->discard_root);
}
static int __clear_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
{
return dm_bitset_clear_bit(&cmd->discard_info, cmd->discard_root,
from_dblock(b), &cmd->discard_root);
}
static int __is_discarded(struct dm_cache_metadata *cmd, dm_dblock_t b,
bool *is_discarded)
{
return dm_bitset_test_bit(&cmd->discard_info, cmd->discard_root,
from_dblock(b), &cmd->discard_root,
is_discarded);
}
static int __discard(struct dm_cache_metadata *cmd,
dm_dblock_t dblock, bool discard)
{
int r;
r = (discard ? __set_discard : __clear_discard)(cmd, dblock);
if (r)
return r;
cmd->changed = true;
return 0;
}
int dm_cache_set_discard(struct dm_cache_metadata *cmd,
dm_dblock_t dblock, bool discard)
{
int r;
down_write(&cmd->root_lock);
r = __discard(cmd, dblock, discard);
up_write(&cmd->root_lock);
return r;
}
static int __load_discards(struct dm_cache_metadata *cmd,
load_discard_fn fn, void *context)
{
int r = 0;
dm_block_t b;
bool discard;
for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {
dm_dblock_t dblock = to_dblock(b);
if (cmd->clean_when_opened) {
r = __is_discarded(cmd, dblock, &discard);
if (r)
return r;
} else
discard = false;
r = fn(context, cmd->discard_block_size, dblock, discard);
if (r)
break;
}
return r;
}
int dm_cache_load_discards(struct dm_cache_metadata *cmd,
load_discard_fn fn, void *context)
{
int r;
down_read(&cmd->root_lock);
r = __load_discards(cmd, fn, context);
up_read(&cmd->root_lock);
return r;
}
dm_cblock_t dm_cache_size(struct dm_cache_metadata *cmd)
{
dm_cblock_t r;
down_read(&cmd->root_lock);
r = cmd->cache_blocks;
up_read(&cmd->root_lock);
return r;
}
static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
{
int r;
__le64 value = pack_value(0, 0);
__dm_bless_for_disk(&value);
r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
&value, &cmd->root);
if (r)
return r;
cmd->changed = true;
return 0;
}
int dm_cache_remove_mapping(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
{
int r;
down_write(&cmd->root_lock);
r = __remove(cmd, cblock);
up_write(&cmd->root_lock);
return r;
}
static int __insert(struct dm_cache_metadata *cmd,
dm_cblock_t cblock, dm_oblock_t oblock)
{
int r;
__le64 value = pack_value(oblock, M_VALID);
__dm_bless_for_disk(&value);
r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
&value, &cmd->root);
if (r)
return r;
cmd->changed = true;
return 0;
}
int dm_cache_insert_mapping(struct dm_cache_metadata *cmd,
dm_cblock_t cblock, dm_oblock_t oblock)
{
int r;
down_write(&cmd->root_lock);
r = __insert(cmd, cblock, oblock);
up_write(&cmd->root_lock);
return r;
}
struct thunk {
load_mapping_fn fn;
void *context;
struct dm_cache_metadata *cmd;
bool respect_dirty_flags;
bool hints_valid;
};
static bool hints_array_initialized(struct dm_cache_metadata *cmd)
{
return cmd->hint_root && cmd->policy_hint_size;
}
static bool hints_array_available(struct dm_cache_metadata *cmd,
const char *policy_name)
{
bool policy_names_match = !strncmp(cmd->policy_name, policy_name,
sizeof(cmd->policy_name));
return cmd->clean_when_opened && policy_names_match &&
hints_array_initialized(cmd);
}
static int __load_mapping(void *context, uint64_t cblock, void *leaf)
{
int r = 0;
bool dirty;
__le64 value;
__le32 hint_value = 0;
dm_oblock_t oblock;
unsigned flags;
struct thunk *thunk = context;
struct dm_cache_metadata *cmd = thunk->cmd;
memcpy(&value, leaf, sizeof(value));
unpack_value(value, &oblock, &flags);
if (flags & M_VALID) {
if (thunk->hints_valid) {
r = dm_array_get_value(&cmd->hint_info, cmd->hint_root,
cblock, &hint_value);
if (r && r != -ENODATA)
return r;
}
dirty = thunk->respect_dirty_flags ? (flags & M_DIRTY) : true;
r = thunk->fn(thunk->context, oblock, to_cblock(cblock),
dirty, le32_to_cpu(hint_value), thunk->hints_valid);
}
return r;
}
static int __load_mappings(struct dm_cache_metadata *cmd, const char *policy_name,
load_mapping_fn fn, void *context)
{
struct thunk thunk;
thunk.fn = fn;
thunk.context = context;
thunk.cmd = cmd;
thunk.respect_dirty_flags = cmd->clean_when_opened;
thunk.hints_valid = hints_array_available(cmd, policy_name);
return dm_array_walk(&cmd->info, cmd->root, __load_mapping, &thunk);
}
int dm_cache_load_mappings(struct dm_cache_metadata *cmd, const char *policy_name,
load_mapping_fn fn, void *context)
{
int r;
down_read(&cmd->root_lock);
r = __load_mappings(cmd, policy_name, fn, context);
up_read(&cmd->root_lock);
return r;
}
static int __dump_mapping(void *context, uint64_t cblock, void *leaf)
{
int r = 0;
__le64 value;
dm_oblock_t oblock;
unsigned flags;
memcpy(&value, leaf, sizeof(value));
unpack_value(value, &oblock, &flags);
return r;
}
static int __dump_mappings(struct dm_cache_metadata *cmd)
{
return dm_array_walk(&cmd->info, cmd->root, __dump_mapping, NULL);
}
void dm_cache_dump(struct dm_cache_metadata *cmd)
{
down_read(&cmd->root_lock);
__dump_mappings(cmd);
up_read(&cmd->root_lock);
}
int dm_cache_changed_this_transaction(struct dm_cache_metadata *cmd)
{
int r;
down_read(&cmd->root_lock);
r = cmd->changed;
up_read(&cmd->root_lock);
return r;
}
static int __dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty)
{
int r;
unsigned flags;
dm_oblock_t oblock;
__le64 value;
r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(cblock), &value);
if (r)
return r;
unpack_value(value, &oblock, &flags);
if (((flags & M_DIRTY) && dirty) || (!(flags & M_DIRTY) && !dirty))
/* nothing to be done */
return 0;
value = pack_value(oblock, flags | (dirty ? M_DIRTY : 0));
__dm_bless_for_disk(&value);
r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
&value, &cmd->root);
if (r)
return r;
cmd->changed = true;
return 0;
}
int dm_cache_set_dirty(struct dm_cache_metadata *cmd,
dm_cblock_t cblock, bool dirty)
{
int r;
down_write(&cmd->root_lock);
r = __dirty(cmd, cblock, dirty);
up_write(&cmd->root_lock);
return r;
}
void dm_cache_metadata_get_stats(struct dm_cache_metadata *cmd,
struct dm_cache_statistics *stats)
{
down_read(&cmd->root_lock);
memcpy(stats, &cmd->stats, sizeof(*stats));
up_read(&cmd->root_lock);
}
void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd,
struct dm_cache_statistics *stats)
{
down_write(&cmd->root_lock);
memcpy(&cmd->stats, stats, sizeof(*stats));
up_write(&cmd->root_lock);
}
int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown)
{
int r;
flags_mutator mutator = (clean_shutdown ? set_clean_shutdown :
clear_clean_shutdown);
down_write(&cmd->root_lock);
r = __commit_transaction(cmd, mutator);
if (r)
goto out;
r = __begin_transaction(cmd);
out:
up_write(&cmd->root_lock);
return r;
}
int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,
dm_block_t *result)
{
int r = -EINVAL;
down_read(&cmd->root_lock);
r = dm_sm_get_nr_free(cmd->metadata_sm, result);
up_read(&cmd->root_lock);
return r;
}
int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,
dm_block_t *result)
{
int r = -EINVAL;
down_read(&cmd->root_lock);
r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
up_read(&cmd->root_lock);
return r;
}
/*----------------------------------------------------------------*/
static int begin_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)
{
int r;
__le32 value;
size_t hint_size;
const char *policy_name = dm_cache_policy_get_name(policy);
if (!policy_name[0] ||
(strlen(policy_name) > sizeof(cmd->policy_name) - 1))
return -EINVAL;
if (strcmp(cmd->policy_name, policy_name)) {
strncpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name));
hint_size = dm_cache_policy_get_hint_size(policy);
if (!hint_size)
return 0; /* short-circuit hints initialization */
cmd->policy_hint_size = hint_size;
if (cmd->hint_root) {
r = dm_array_del(&cmd->hint_info, cmd->hint_root);
if (r)
return r;
}
r = dm_array_empty(&cmd->hint_info, &cmd->hint_root);
if (r)
return r;
value = cpu_to_le32(0);
__dm_bless_for_disk(&value);
r = dm_array_resize(&cmd->hint_info, cmd->hint_root, 0,
from_cblock(cmd->cache_blocks),
&value, &cmd->hint_root);
if (r)
return r;
}
return 0;
}
int dm_cache_begin_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)
{
int r;
down_write(&cmd->root_lock);
r = begin_hints(cmd, policy);
up_write(&cmd->root_lock);
return r;
}
static int save_hint(struct dm_cache_metadata *cmd, dm_cblock_t cblock,
uint32_t hint)
{
int r;
__le32 value = cpu_to_le32(hint);
__dm_bless_for_disk(&value);
r = dm_array_set_value(&cmd->hint_info, cmd->hint_root,
from_cblock(cblock), &value, &cmd->hint_root);
cmd->changed = true;
return r;
}
int dm_cache_save_hint(struct dm_cache_metadata *cmd, dm_cblock_t cblock,
uint32_t hint)
{
int r;
if (!hints_array_initialized(cmd))
return 0;
down_write(&cmd->root_lock);
r = save_hint(cmd, cblock, hint);
up_write(&cmd->root_lock);
return r;
}
