diff mbox series

[RFC,v2,3/4] mm: add functions folio_in_range() and folio_within_vma()

Message ID 20230721094043.2506691-4-fengwei.yin@intel.com
State New
Headers
Series fix large folio for madvise_cold_or_pageout() |

Commit Message

Yin Fengwei July 21, 2023, 9:40 a.m. UTC 
  It will be used to check whether the folio is mapped to specific
VMA and whether the mapping address of folio is in the range.

Also a helper function folio_within_vma() to check whether folio
is in the range of vma based on folio_in_range().

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
---
 mm/internal.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

Comments

Yu Zhao July 25, 2023, 5:42 a.m. UTC | #1 
On Fri, Jul 21, 2023 at 3:41 AM Yin Fengwei <fengwei.yin@intel.com> wrote:
>
> It will be used to check whether the folio is mapped to specific
> VMA and whether the mapping address of folio is in the range.
>
> Also a helper function folio_within_vma() to check whether folio
> is in the range of vma based on folio_in_range().
>
> Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
> ---
>  mm/internal.h | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>
> diff --git a/mm/internal.h b/mm/internal.h
> index 483add0bfb28..c7dd15d8de3e 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -585,6 +585,38 @@ extern long faultin_vma_page_range(struct vm_area_struct *vma,
>                                    bool write, int *locked);
>  extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags,
>                                unsigned long bytes);
> +
> +static inline bool
> +folio_in_range(struct folio *folio, struct vm_area_struct *vma,
> +               unsigned long start, unsigned long end)
> +{
> +       pgoff_t pgoff, addr;
> +       unsigned long vma_pglen = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
> +
> +       VM_WARN_ON_FOLIO(folio_test_ksm(folio), folio);
> +       if (start < vma->vm_start)
> +               start = vma->vm_start;
> +
> +       if (end > vma->vm_end)
> +               end = vma->vm_end;
> +
> +       pgoff = folio_pgoff(folio);
> +
> +       /* if folio start address is not in vma range */
> +       if (pgoff < vma->vm_pgoff || pgoff > vma->vm_pgoff + vma_pglen)
> +               return false;
> +
> +       addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
> +
> +       return ((addr >= start) && (addr + folio_size(folio) <= end));

Not sure how much we care but better to avoid (addr + folio_size()),
since it might wrap to 0 on 32-bit systems.

Reusing some helpers from mm/internal.h, e.g., vma_pgoff_address(),
would be great, if it's possible (I'm not sure if it's).
diff mbox series

Patch

diff --git a/mm/internal.h b/mm/internal.h
index 483add0bfb28..c7dd15d8de3e 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -585,6 +585,38 @@  extern long faultin_vma_page_range(struct vm_area_struct *vma,
 				   bool write, int *locked);
 extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags,
 			       unsigned long bytes);
+
+static inline bool
+folio_in_range(struct folio *folio, struct vm_area_struct *vma,
+		unsigned long start, unsigned long end)
+{
+	pgoff_t pgoff, addr;
+	unsigned long vma_pglen = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+
+	VM_WARN_ON_FOLIO(folio_test_ksm(folio), folio);
+	if (start < vma->vm_start)
+		start = vma->vm_start;
+
+	if (end > vma->vm_end)
+		end = vma->vm_end;
+
+	pgoff = folio_pgoff(folio);
+
+	/* if folio start address is not in vma range */
+	if (pgoff < vma->vm_pgoff || pgoff > vma->vm_pgoff + vma_pglen)
+		return false;
+
+	addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
+
+	return ((addr >= start) && (addr + folio_size(folio) <= end));
+}
+
+static inline bool
+folio_within_vma(struct folio *folio, struct vm_area_struct *vma)
+{
+	return folio_in_range(folio, vma, vma->vm_start, vma->vm_end);
+}
+
 /*
  * mlock_vma_folio() and munlock_vma_folio():
  * should be called with vma's mmap_lock held for read or write,