Function dfs_page_release

components/dfs/dfs_v2/src/dfs_pcache.c:1055–1091

* @brief Release a page from page cache when reference count reaches zero * * This function decrements the reference count of a page and performs cleanup * when the count reaches zero. It handles: * - Unmapping all virtual mappings of the page * - Writing back dirty pages to storage * - Freeing physical memory and page structure * * @param[in,out] page Pointer to the page structure to be r

 * @param[in,out] page Pointer to the page structure to be released
 */
static void dfs_page_release(struct dfs_page *page)
{
    struct dfs_aspace *aspace = page->aspace;

    dfs_aspace_lock(aspace);

    rt_atomic_sub(&(page->ref_count), 1);

    if (rt_atomic_load(&(page->ref_count)) == 0)
    {
        dfs_page_unmap(page);

        if (page->is_dirty == 1 && aspace->vnode)
        {
            if (aspace->vnode->size < page->fpos + page->size)
            {
                page->len = aspace->vnode->size - page->fpos;
            }
            else
            {
                page->len = page->size;
            }
            if (aspace->ops->write)
            {
                aspace->ops->write(page);
            }
            page->is_dirty = 0;
        }
        RT_ASSERT(page->is_dirty == 0);

        rt_pages_free(page->page, 0);
        page->page = RT_NULL;
        rt_free(page);
    }

    dfs_aspace_unlock(aspace);
}

/**
 * @brief Compare file positions for page alignment