- return !!page;
-}
-
-/*
- * Install a file page to a given virtual memory address, release any
- * previously existing mapping.
- */
-int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, struct page *page, pgprot_t prot)
-{
- struct inode *inode;
- pgoff_t size;
- int err = -ENOMEM;
- pte_t *pte;
- pte_t pte_val;
- spinlock_t *ptl;
-
- pte = get_locked_pte(mm, addr, &ptl);
- if (!pte)
- goto out;
-
- /*
- * This page may have been truncated. Tell the
- * caller about it.
- */
- err = -EINVAL;
- inode = vma->vm_file->f_mapping->host;
- size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
- if (!page->mapping || page->index >= size)
- goto unlock;
- err = -ENOMEM;
- if (page_mapcount(page) > INT_MAX/2)
- goto unlock;
-
- if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte))
- inc_mm_counter(mm, file_rss);
-
- flush_icache_page(vma, page);
- pte_val = mk_pte(page, prot);
- set_pte_at(mm, addr, pte, pte_val);
- page_add_file_rmap(page);
- update_mmu_cache(vma, addr, pte_val);
- lazy_mmu_prot_update(pte_val);
- err = 0;
-unlock:
- pte_unmap_unlock(pte, ptl);
-out:
- return err;