Source of dm-thin-metadata.c - linux-imx - PHYTEC BitBucket (Stash)

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    int r = -EINVAL;
​
    down_write(&td->pmd->root_lock);
    if (!td->pmd->fail_io)
        r = __remove_range(td, begin, end);
    up_write(&td->pmd->root_lock);
​
    return r;
}
​
int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result)
int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result)
{
    int r;
    uint32_t ref_count;
​
    down_read(&pmd->root_lock);
    r = dm_sm_get_count(pmd->data_sm, b, &ref_count);
    if (!r)
        *result = (ref_count != 0);
        *result = (ref_count > 1);
    up_read(&pmd->root_lock);
​
    return r;
}
​
int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e)
{
    int r = 0;
​
    down_write(&pmd->root_lock);