コード例 #1
0
static int brb_pop(struct bop_ring_buffer *brb)
{
	if (brb_empty(brb))
		return -ENODATA;

	brb->begin = brb_next(brb, brb->begin);

	return 0;
}
コード例 #2
0
static int sm_metadata_count_is_more_than_one(struct dm_space_map *sm,
					      dm_block_t b, int *result)
{
	int r, adjustment = 0;
	unsigned i;
	struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
	uint32_t rc;

	/*
	 * We may have some uncommitted adjustments to add.  This list
	 * should always be really short.
	 */
	for (i = smm->uncommitted.begin;
	     i != smm->uncommitted.end;
	     i = brb_next(&smm->uncommitted, i)) {

		struct block_op *op = smm->uncommitted.bops + i;

		if (op->block != b)
			continue;

		switch (op->type) {
		case BOP_INC:
			adjustment++;
			break;

		case BOP_DEC:
			adjustment--;
			break;
		}
	}

	if (adjustment > 1) {
		*result = 1;
		return 0;
	}

	r = sm_ll_lookup_bitmap(&smm->ll, b, &rc);
	if (r)
		return r;

	if (rc == 3)
		/*
		 * We err on the side of caution, and always return true.
		 */
		*result = 1;
	else
		*result = rc + adjustment > 1;

	return 0;
}
コード例 #3
0
static int brb_pop(struct bop_ring_buffer *brb, struct block_op *result)
{
	struct block_op *bop;

	if (brb_empty(brb))
		return -ENODATA;

	bop = brb->bops + brb->begin;
	result->type = bop->type;
	result->block = bop->block;

	brb->begin = brb_next(brb, brb->begin);

	return 0;
}
コード例 #4
0
static int brb_push(struct bop_ring_buffer *brb,
		    enum block_op_type type, dm_block_t b)
{
	struct block_op *bop;
	unsigned next = brb_next(brb, brb->end);

	/*
	 * We don't allow the last bop to be filled, this way we can
	 * differentiate between full and empty.
	 */
	if (next == brb->begin)
		return -ENOMEM;

	bop = brb->bops + brb->end;
	bop->type = type;
	bop->block = b;

	brb->end = next;

	return 0;
}
コード例 #5
0
static int sm_metadata_get_count(struct dm_space_map *sm, dm_block_t b,
				 uint32_t *result)
{
	int r;
	unsigned i;
	struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
	unsigned adjustment = 0;

	/*
	 * We may have some uncommitted adjustments to add.  This list
	 * should always be really short.
	 */
	for (i = smm->uncommitted.begin;
	     i != smm->uncommitted.end;
	     i = brb_next(&smm->uncommitted, i)) {
		struct block_op *op = smm->uncommitted.bops + i;

		if (op->block != b)
			continue;

		switch (op->type) {
		case BOP_INC:
			adjustment++;
			break;

		case BOP_DEC:
			adjustment--;
			break;
		}
	}

	r = sm_ll_lookup(&smm->ll, b, result);
	if (r)
		return r;

	*result += adjustment;

	return 0;
}