[RFC PATCH 1/3] mm: add function folio_in_range()

[Yin Fengwei]

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.

Signed-off-by: Yin Fengwei <fengwei.yin@xxxxxxxxx>
---
 mm/internal.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/mm/internal.h b/mm/internal.h
index f1276d90484ad..66117523d7d71 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -585,6 +585,32 @@ 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));
+}
+
 /*
  * mlock_vma_folio() and munlock_vma_folio():
  * should be called with vma's mmap_lock held for read or write,
-- 
2.39.2