> diff --git a/mm/msync.c b/mm/msync.c
> index 144a757..a1b3fc6 100644
> --- a/mm/msync.c
> +++ b/mm/msync.c
> @@ -14,6 +14,122 @@
> #include <linux/syscalls.h>
> #include <linux/sched.h>
>
> +unsigned long masync_pte_range(struct vm_area_struct *vma, pmd_t *pdm,
> + unsigned long addr, unsigned long end)
> +{
> + pte_t *pte;
> + spinlock_t *ptl;
> +
> + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
> + arch_enter_lazy_mmu_mode();
> + do {
> + pte_t ptent = *pte;
> +
> + if (pte_none(ptent))
> + continue;
> +
> + if (!pte_present(ptent))
> + continue;
> +
> + if (pte_dirty(ptent) && pte_write(ptent)) {
> + flush_cache_page(vma, addr, pte_pfn(ptent));
Hmm, I'm not sure flush_cache_page() is needed. Or does does dirty
data in the cache somehow interfere with the page protection?
> + ptent = ptep_clear_flush(vma, addr, pte);
> + ptent = pte_wrprotect(ptent);
> + set_pte_at(vma->vm_mnm, addr, pte, ptent);
> + }
> + } while (pte++, addr += PAGE_SIZE, addr != end);
> + arch_leave_lazy_mmu_mode();
> + pte_unmap_unlock(pte - 1, ptl);
> +
> + return addr;
> +}
> +
> +unsigned long masync_pmd_range(struct vm_area_struct *vma, pud_t *pud,
> + unsigned long addr, unsigned long end)
> +{
> + pmd_t *pmd;
> + unsigned long next;
> +
> + pmd = pmd_offset(pud, addr);
> + do {
> + next = pmd_addr_end(addr, end);
> + if (pmd_none_or_clear_bad(pmd))
> + continue;
> + next = masync_pte_range(vma, pmd, addr, next);
> + } while (pmd++, addr = next, addr != end);
> +
> + return addr;
> +}
> +
> +unsigned long masync_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
> + unsigned long addr, unsigned long end)
> +{
> + pud_t *pud;
> + unsigned long next;
> +
> + pud = pud_offset(pgd, addr);
> + do {
> + next = pud_addr_end(addr, end);
> + if (pud_none_or_clear_bad(pud))
> + continue;
> + next = masync_pmd_range(vma, pud, addr, next);
> + } while (pud++, addr = next, addr != end);
> +
> + return addr;
> +}
> +
> +unsigned long masync_pgd_range()
> +{
> + pgd_t *pgd;
> + unsigned long next;
> +
> + pgd = pgd_offset(vma->vm_mm, addr);
> + do {
> + next = pgd_addr_end(addr, end);
> + if (pgd_none_of_clear_bad(pgd))
> + continue;
> + next = masync_pud_range(vma, pgd, addr, next);
> + } while (pgd++, addr = next, addr != end);
> +
> + return addr;
> +}
> +
> +int masync_vma_one(struct vm_area_struct *vma,
> + unsigned long start, unsigned long end)
> +{
> + if (start < vma->vm_start)
> + start = vma->vm_start;
> +
> + if (end > vma->vm_end)
> + end = vma->vm_end;
> +
> + masync_pgd_range(vma, start, end);
> +
> + return 0;
> +}
> +
> +int masync_vma(struct vm_area_struct *vma,
> + unsigned long start, unsigned long end)
> +{
> + struct address_space *mapping;
> + struct vm_area_struct *vma_iter;
> +
> + if (!(vma->vm_flags & VM_SHARED))
> + return 0;
> +
> + mapping = vma->vm_file->f_mapping;
> +
> + if (!mapping_cap_account_dirty(mapping))
> + return 0;
> +
> + spin_lock(&mapping->i_mmap_lock);
> + vma_prio_tree_foreach(vma_iter, &iter, &mapping->i_mmap, start, end)
> + masync_vma_one(vma_iter, start, end);
> + spin_unlock(&mapping->i_mmap_lock);
This is hoding i_mmap_lock for possibly quite long. Isn't that going
to cause problems?
Miklos
> +
> + return 0;
> +}
> +
> /*
> * MS_SYNC syncs the entire file - including mappings.
> *
>
>
>
>
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