int dm_array_get_value(struct dm_array_info *info, dm_block_t root,
uint32_t index, void *value_le)
{
int r;
struct dm_block *block;
struct array_block *ab;
size_t size_of_block;
unsigned entry, max_entries;
size_of_block = dm_bm_block_size(dm_tm_get_bm(info->btree_info.tm));
max_entries = calc_max_entries(info->value_type.size, size_of_block);
r = lookup_ablock(info, root, index / max_entries, &block, &ab);
if (r)
return r;
entry = index % max_entries;
if (entry >= le32_to_cpu(ab->nr_entries))
r = -ENODATA;
else
memcpy(value_le, element_at(info, ab, entry),
info->value_type.size);
unlock_ablock(info, block);
return r;
}
static int walk_ablock(void *context, uint64_t *keys, void *leaf)
{
struct walk_info *wi = context;
int r;
unsigned i;
__le64 block_le;
unsigned nr_entries, max_entries;
struct dm_block *block;
struct array_block *ab;
memcpy(&block_le, leaf, sizeof(block_le));
r = get_ablock(wi->info, le64_to_cpu(block_le), &block, &ab);
if (r)
return r;
max_entries = le32_to_cpu(ab->max_entries);
nr_entries = le32_to_cpu(ab->nr_entries);
for (i = 0; i < nr_entries; i++) {
r = wi->fn(wi->context, keys[0] * max_entries + i,
element_at(wi->info, ab, i));
if (r)
break;
}
unlock_ablock(wi->info, block);
return r;
}
/*
* Utility function that calls one of the value_type methods on every value
* in an array block.
*/
static void on_entries(struct dm_array_info *info, struct array_block *ab,
void (*fn)(void *, const void *))
{
unsigned i, nr_entries = le32_to_cpu(ab->nr_entries);
for (i = 0; i < nr_entries; i++)
fn(info->value_type.context, element_at(info, ab, i));
}
REAL matr_diag::at(size_t i, size_t j, size_t * next_j) const
{
bool zero = mask->get(j);
if (zero) {
if ( next_j )
*next_j = UINT_MAX;
return REAL(0);
}
return element_at(i,j,next_j);
};
ssize_t find_element(struct listy *ly, unsigned val) {
if (element_at(ly, 0) == -1)
return -1; // Zero-sized list
ssize_t l = 1;
ssize_t r;
long long v = element_at(ly, l);
while (v != -1 && v <= val) {
if (v == val) {
// We got lucky!
return l;
}
l *= 2;
v = element_at(ly, l);
}
r = l;
l /= 2;
while (l <= r) {
ssize_t m = l+(r-l)/2;
v = element_at(ly, m);
if (v == -1)
r = m-1;
else if (v == val)
return m;
else if (v < val)
l = m+1;
else
r = m-1;
}
return -1;
}
/*
* Remove some entries from the back of an array block. Every value
* removed will be decremented. new_nr must be <= the current number of
* entries.
*/
static void trim_ablock(struct dm_array_info *info, struct array_block *ab,
unsigned new_nr)
{
unsigned i;
uint32_t nr_entries;
struct dm_btree_value_type *vt = &info->value_type;
BUG_ON(new_nr > le32_to_cpu(ab->max_entries));
BUG_ON(new_nr > le32_to_cpu(ab->nr_entries));
nr_entries = le32_to_cpu(ab->nr_entries);
for (i = nr_entries; i > new_nr; i--)
if (vt->dec)
vt->dec(vt->context, element_at(info, ab, i - 1));
ab->nr_entries = cpu_to_le32(new_nr);
}
/*
* Pad an array block out with a particular value. Every instance will
* cause an increment of the value_type. new_nr must always be more than
* the current number of entries.
*/
static void fill_ablock(struct dm_array_info *info, struct array_block *ab,
const void *value, unsigned new_nr)
{
unsigned i;
uint32_t nr_entries;
struct dm_btree_value_type *vt = &info->value_type;
BUG_ON(new_nr > le32_to_cpu(ab->max_entries));
BUG_ON(new_nr < le32_to_cpu(ab->nr_entries));
nr_entries = le32_to_cpu(ab->nr_entries);
for (i = nr_entries; i < new_nr; i++) {
if (vt->inc)
vt->inc(vt->context, value);
memcpy(element_at(info, ab, i), value, vt->size);
}
ab->nr_entries = cpu_to_le32(new_nr);
}
static int array_set_value(struct dm_array_info *info, dm_block_t root,
uint32_t index, const void *value, dm_block_t *new_root)
{
int r;
struct dm_block *block;
struct array_block *ab;
size_t size_of_block;
unsigned max_entries;
unsigned entry;
void *old_value;
struct dm_btree_value_type *vt = &info->value_type;
size_of_block = dm_bm_block_size(dm_tm_get_bm(info->btree_info.tm));
max_entries = calc_max_entries(info->value_type.size, size_of_block);
r = shadow_ablock(info, &root, index / max_entries, &block, &ab);
if (r)
return r;
*new_root = root;
entry = index % max_entries;
if (entry >= le32_to_cpu(ab->nr_entries)) {
r = -ENODATA;
goto out;
}
old_value = element_at(info, ab, entry);
if (vt->dec &&
(!vt->equal || !vt->equal(vt->context, old_value, value))) {
vt->dec(vt->context, old_value);
if (vt->inc)
vt->inc(vt->context, value);
}
memcpy(old_value, value, info->value_type.size);
out:
unlock_ablock(info, block);
return r;
}
