Function dfs_aspace_page_unmap

components/dfs/dfs_v2/src/dfs_pcache.c:1972–2015

* Unmap a page from virtual address space. * * @param[in] file The file object containing the page * @param[in] varea The virtual memory area * @param[in] vaddr The virtual address to unmap * * @return Always returns 0 on success * * @note This function removes the mapping between a virtual address and a physical page. * It handles cleanup of mmap structures and marks page

 *          It handles cleanup of mmap structures and marks pages dirty if needed.
 */
int dfs_aspace_page_unmap(struct dfs_file *file, struct rt_varea *varea, void *vaddr)
{
    struct dfs_page *page;
    struct dfs_aspace *aspace = file->vnode->aspace;

    if (aspace)
    {
        dfs_aspace_lock(aspace);

        page = dfs_page_search(aspace, dfs_aspace_fpos(varea, vaddr));
        if (page)
        {
            rt_list_t *node, *tmp;
            struct dfs_mmap *map;
            rt_varea_unmap_page(varea, vaddr);

            node = page->mmap_head.next;

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

                if (map && varea->aspace == map->aspace && vaddr == map->vaddr)
                {
                    if (!rt_varea_is_private_locked(varea))
                    {
                        dfs_page_dirty(page);
                    }
                    rt_list_remove(tmp);
                    rt_free(map);
                    break;
                }
            }

            dfs_page_release(page);
        }

        dfs_aspace_unlock(aspace);
    }

    return 0;
}

/**
 * Mark a page as dirty in the address space.