static int array_block_check(struct dm_block_validator *v,
struct dm_block *b,
size_t size_of_block)
{
struct array_block *bh_le = dm_block_data(b);
__le32 csum_disk;
if (dm_block_location(b) != le64_to_cpu(bh_le->blocknr)) {
DMERR_LIMIT("array_block_check failed: blocknr %llu != wanted %llu",
(unsigned long long) le64_to_cpu(bh_le->blocknr),
(unsigned long long) dm_block_location(b));
return -ENOTBLK;
}
csum_disk = cpu_to_le32(dm_bm_checksum(&bh_le->max_entries,
size_of_block - sizeof(__le32),
CSUM_XOR));
if (csum_disk != bh_le->csum) {
DMERR_LIMIT("array_block_check failed: csum %u != wanted %u",
(unsigned) le32_to_cpu(csum_disk),
(unsigned) le32_to_cpu(bh_le->csum));
return -EILSEQ;
}
return 0;
}
static int node_check(struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
struct node *n = dm_block_data(b);
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)) {
DMERR_LIMIT("node_check failed blocknr %llu wanted %llu",
le64_to_cpu(h->blocknr), dm_block_location(b));
return -ENOTBLK;
}
csum_disk = cpu_to_le32(dm_bm_checksum(&h->flags,
block_size - sizeof(__le32),
BTREE_CSUM_XOR));
if (csum_disk != h->csum) {
DMERR_LIMIT("node_check failed csum %u wanted %u",
le32_to_cpu(csum_disk), le32_to_cpu(h->csum));
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) {
DMERR_LIMIT("node_check failed: max_entries too large");
return -EILSEQ;
}
if (le32_to_cpu(h->nr_entries) > le32_to_cpu(h->max_entries)) {
DMERR_LIMIT("node_check failed, too many entries");
return -EILSEQ;
}
/*
* The node must be either INTERNAL or LEAF.
*/
flags = le32_to_cpu(h->flags);
if (!(flags & INTERNAL_NODE) && !(flags & LEAF_NODE)) {
DMERR_LIMIT("node_check failed, node is neither INTERNAL or LEAF");
return -EILSEQ;
}
return 0;
}
static int sm_metadata_new_block(struct dm_space_map *sm, dm_block_t *b)
{
dm_block_t count;
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
int r = sm_metadata_new_block_(sm, b);
if (r) {
DMERR_LIMIT("unable to allocate new metadata block");
return r;
}
r = sm_metadata_get_nr_free(sm, &count);
if (r) {
DMERR_LIMIT("couldn't get free block count");
return r;
}
check_threshold(&smm->threshold, count);
return r;
}
static void block_dec(void *context, const void *value)
{
int r;
uint64_t b;
__le64 block_le;
uint32_t ref_count;
struct dm_block *block;
struct array_block *ab;
struct dm_array_info *info = context;
memcpy(&block_le, value, sizeof(block_le));
b = le64_to_cpu(block_le);
r = dm_tm_ref(info->btree_info.tm, b, &ref_count);
if (r) {
DMERR_LIMIT("couldn't get reference count for block %llu",
(unsigned long long) b);
return;
}
if (ref_count == 1) {
/*
* We're about to drop the last reference to this ablock.
* So we need to decrement the ref count of the contents.
*/
r = get_ablock(info, b, &block, &ab);
if (r) {
DMERR_LIMIT("couldn't get array block %llu",
(unsigned long long) b);
return;
}
dec_ablock_entries(info, ab);
unlock_ablock(info, block);
}
dm_tm_dec(info->btree_info.tm, b);
}