-#include <linux/hugetlb.h>
-
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-
-/*
- * Called with mm->page_table_lock held to protect against other
- * threads/the swapper from ripping pte's out from under us.
- */
-static int filemap_sync_pte(pte_t *ptep, struct vm_area_struct *vma,
- unsigned long address, unsigned int flags)
-{
- pte_t pte = *ptep;
- unsigned long pfn = pte_pfn(pte);
- struct page *page;
-
- if (pte_present(pte) && pfn_valid(pfn)) {
- page = pfn_to_page(pfn);
- if (!PageReserved(page) &&
- (ptep_clear_flush_dirty(vma, address, ptep) ||
- page_test_and_clear_dirty(page)))
- set_page_dirty(page);
- }
- return 0;
-}
-
-static int filemap_sync_pte_range(pmd_t * pmd,
- unsigned long address, unsigned long end,
- struct vm_area_struct *vma, unsigned int flags)
-{
- pte_t *pte;
- int error;
-
- if (pmd_none(*pmd))
- return 0;
- if (pmd_bad(*pmd)) {
- pmd_ERROR(*pmd);
- pmd_clear(pmd);
- return 0;
- }
- pte = pte_offset_map(pmd, address);
- if ((address & PMD_MASK) != (end & PMD_MASK))
- end = (address & PMD_MASK) + PMD_SIZE;
- error = 0;
- do {
- error |= filemap_sync_pte(pte, vma, address, flags);
- address += PAGE_SIZE;
- pte++;
- } while (address && (address < end));
-
- pte_unmap(pte - 1);
-
- return error;
-}
-
-static inline int filemap_sync_pmd_range(pgd_t * pgd,
- unsigned long address, unsigned long end,
- struct vm_area_struct *vma, unsigned int flags)
-{
- pmd_t * pmd;
- int error;
-
- if (pgd_none(*pgd))
- return 0;
- if (pgd_bad(*pgd)) {
- pgd_ERROR(*pgd);
- pgd_clear(pgd);
- return 0;
- }
- pmd = pmd_offset(pgd, address);
- if ((address & PGDIR_MASK) != (end & PGDIR_MASK))
- end = (address & PGDIR_MASK) + PGDIR_SIZE;
- error = 0;
- do {
- error |= filemap_sync_pte_range(pmd, address, end, vma, flags);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address && (address < end));
- return error;
-}
-
-static int filemap_sync(struct vm_area_struct * vma, unsigned long address,
- size_t size, unsigned int flags)
-{
- pgd_t * dir;
- unsigned long end = address + size;
- int error = 0;
-
- /* Aquire the lock early; it may be possible to avoid dropping
- * and reaquiring it repeatedly.
- */
- spin_lock(&vma->vm_mm->page_table_lock);
-
- dir = pgd_offset(vma->vm_mm, address);
- flush_cache_range(vma, address, end);
-
- /* For hugepages we can't go walking the page table normally,
- * but that's ok, hugetlbfs is memory based, so we don't need
- * to do anything more on an msync() */
- if (is_vm_hugetlb_page(vma))
- goto out;
-
- if (address >= end)
- BUG();
- do {
- error |= filemap_sync_pmd_range(dir, address, end, vma, flags);
- address = (address + PGDIR_SIZE) & PGDIR_MASK;
- dir++;
- } while (address && (address < end));
- /*
- * Why flush ? filemap_sync_pte already flushed the tlbs with the
- * dirty bits.
- */
- flush_tlb_range(vma, end - size, end);
- out:
- spin_unlock(&vma->vm_mm->page_table_lock);
-
- return error;
-}