Function dfs_page_remove

components/dfs/dfs_v2/src/dfs_pcache.c:1258–1289

* @brief Remove a page from the address space's page cache * * This function safely removes a page from both the space and dirty lists of the address space. * It decrements the reference count and releases the page if it's the last reference. * * @param[in] page Pointer to the page structure to be removed * * @return 0 if the page was successfully removed, -1 if the page is still referenced

 * @return 0 if the page was successfully removed, -1 if the page is still referenced
 */
static int dfs_page_remove(struct dfs_page *page)
{
    int ret = -1;
    struct dfs_aspace *aspace = page->aspace;

    dfs_aspace_lock(aspace);

    if (rt_atomic_load(&(page->ref_count)) == 1)
    {
        if (page->space_node.next != RT_NULL)
        {
            rt_list_remove(&page->space_node);
            page->space_node.next = RT_NULL;
            aspace->pages_count--;
            _dfs_page_remove(aspace, page);
        }
        if (page->dirty_node.next != RT_NULL)
        {
            rt_list_remove(&page->dirty_node);
            page->dirty_node.next = RT_NULL;
        }

        rt_atomic_sub(&(__pcache.pages_count), 1);

        dfs_page_release(page);
        ret = 0;
    }

    dfs_aspace_unlock(aspace);

    return ret;
}

/**
 * @brief Move a page to active list