Function dfs_page_unmap

components/dfs/dfs_v2/src/dfs_pcache.c:955–990

* @brief Unmap all memory mappings for a page * * This function unmaps all virtual memory areas that have mapped this physical page. * It also marks the page as dirty if it contains valid data that hasn't been written back. * * @param[in,out] page Pointer to the page structure to unmap * * @return Always returns 0 */

 * @return Always returns 0
 */
static int dfs_page_unmap(struct dfs_page *page)
{
    rt_list_t *next;
    struct dfs_mmap *map;

    next = page->mmap_head.next;

    if (next != &page->mmap_head && page->fpos < page->aspace->vnode->size)
    {
        dfs_page_dirty(page);
    }

    while (next != &page->mmap_head)
    {
        map = rt_list_entry(next, struct dfs_mmap, mmap_node);
        next = next->next;

        if (map)
        {
            rt_varea_t varea;
            void *vaddr;

            varea = rt_aspace_query(map->aspace, map->vaddr);
            RT_ASSERT(varea);
            vaddr = dfs_aspace_vaddr(varea, page->fpos);

            rt_varea_unmap_page(varea, vaddr);

            rt_free(map);
        }
    }

    rt_list_init(&page->mmap_head);

    return 0;
}

/**
 * @brief Create a new page structure for page cache