static int sm_metadata_new_block_(struct dm_space_map *sm, dm_block_t *b)
{
	int r, r2 = 0;
	enum allocation_event ev;
	struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);

	r = sm_ll_find_free_block(&smm->old_ll, smm->begin, smm->old_ll.nr_blocks, b);
	if (r)
		return r;

	smm->begin = *b + 1;

	if (recursing(smm))
		r = add_bop(smm, BOP_INC, *b);
	else {
		in(smm);
		r = sm_ll_inc(&smm->ll, *b, &ev);
		r2 = out(smm);
	}

	if (!r)
		smm->allocated_this_transaction++;

	return combine_errors(r, r2);
}
Пример #2
0
static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
{
    int r, i;
    enum allocation_event ev;
    struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
    dm_block_t old_len = smm->ll.nr_blocks;

    /*
     * Flick into a mode where all blocks get allocated in the new area.
     */
    smm->begin = old_len;
    memcpy(sm, &bootstrap_ops, sizeof(*sm));

    /*
     * Extend.
     */
    r = sm_ll_extend(&smm->ll, extra_blocks);
    if (r)
        goto out;

    /*
     * We repeatedly increment then commit until the commit doesn't
     * allocate any new blocks.
     */
    do {
        for (i = old_len; !r && i < smm->begin; i++) {
            r = sm_ll_inc(&smm->ll, i, &ev);
            if (r)
                goto out;
        }
        old_len = smm->begin;

        r = apply_bops(smm);
        if (r) {
            DMERR("%s: apply_bops failed", __func__);
            goto out;
        }

        r = sm_ll_commit(&smm->ll);
        if (r)
            goto out;

    } while (old_len != smm->begin);

out:
    /*
     * Switch back to normal behaviour.
     */
    memcpy(sm, &ops, sizeof(*sm));
    return r;
}
int dm_sm_metadata_create(struct dm_space_map *sm,
			  struct dm_transaction_manager *tm,
			  dm_block_t nr_blocks,
			  dm_block_t superblock)
{
	int r;
	dm_block_t i;
	enum allocation_event ev;
	struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);

	smm->begin = superblock + 1;
	smm->recursion_count = 0;
	smm->allocated_this_transaction = 0;
	brb_init(&smm->uncommitted);
	threshold_init(&smm->threshold);

	memcpy(&smm->sm, &bootstrap_ops, sizeof(smm->sm));

	r = sm_ll_new_metadata(&smm->ll, tm);
	if (r)
		return r;

	if (nr_blocks > DM_SM_METADATA_MAX_BLOCKS)
		nr_blocks = DM_SM_METADATA_MAX_BLOCKS;
	r = sm_ll_extend(&smm->ll, nr_blocks);
	if (r)
		return r;

	memcpy(&smm->sm, &ops, sizeof(smm->sm));

	/*
	 * Now we need to update the newly created data structures with the
	 * allocated blocks that they were built from.
	 */
	for (i = superblock; !r && i < smm->begin; i++)
		r = sm_ll_inc(&smm->ll, i, &ev);

	if (r)
		return r;

	r = apply_bops(smm);
	if (r) {
		DMERR("%s: apply_bops failed", __func__);
		return r;
	}

	return sm_metadata_commit(sm);
}
static int sm_metadata_inc_block(struct dm_space_map *sm, dm_block_t b)
{
	int r, r2 = 0;
	enum allocation_event ev;
	struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);

	if (recursing(smm))
		r = add_bop(smm, BOP_INC, b);
	else {
		in(smm);
		r = sm_ll_inc(&smm->ll, b, &ev);
		r2 = out(smm);
	}

	return combine_errors(r, r2);
}
static int commit_bop(struct sm_metadata *smm, struct block_op *op)
{
	int r = 0;
	enum allocation_event ev;

	switch (op->type) {
	case BOP_INC:
		r = sm_ll_inc(&smm->ll, op->block, &ev);
		break;

	case BOP_DEC:
		r = sm_ll_dec(&smm->ll, op->block, &ev);
		break;
	}

	return r;
}
int dm_sm_metadata_create(struct dm_space_map *sm,
			  struct dm_transaction_manager *tm,
			  dm_block_t nr_blocks,
			  dm_block_t superblock)
{
	int r;
	dm_block_t i;
	enum allocation_event ev;
	struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);

	smm->begin = superblock + 1;
	smm->recursion_count = 0;
	smm->allocated_this_transaction = 0;
	smm->nr_uncommitted = 0;

	memcpy(&smm->sm, &bootstrap_ops, sizeof(smm->sm));

	r = sm_ll_new_metadata(&smm->ll, tm);
	if (r)
		return r;

	r = sm_ll_extend(&smm->ll, nr_blocks);
	if (r)
		return r;

	memcpy(&smm->sm, &ops, sizeof(smm->sm));

	/*
	 * Now we need to update the newly created data structures with the
	 * allocated blocks that they were built from.
	 */
	for (i = superblock; !r && i < smm->begin; i++)
		r = sm_ll_inc(&smm->ll, i, &ev);

	if (r)
		return r;

	return sm_metadata_commit(sm);
}