[PATCH v6 11/71] mm: Add VMA iterator

[Liam Howlett <liam.howlett@xxxxxxxxxx>]

From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>

This thin layer of abstraction over the maple tree state is for
iterating over VMAs.  You can go forwards, go backwards or ask where
the iterator is.  Rename the existing vma_next() to __vma_next() --
it will be removed by the end of this series.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
---
 include/linux/mm.h       | 31 +++++++++++++++++++++++++++++++
 include/linux/mm_types.h | 21 +++++++++++++++++++++
 mm/mmap.c                | 10 +++++-----
 3 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c71cf425048e..0353e9a902a8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -655,6 +655,37 @@ static inline bool vma_is_accessible(struct vm_area_struct *vma)
 	return vma->vm_flags & VM_ACCESS_FLAGS;
 }
 
+static inline
+struct vm_area_struct *vma_find(struct vma_iterator *vmi, unsigned long max)
+{
+	return mas_find(&vmi->mas, max);
+}
+
+static inline struct vm_area_struct *vma_next(struct vma_iterator *vmi)
+{
+	/*
+	 * Uses vma_find() to get the first VMA when the iterator starts.
+	 * Calling mas_next() could skip the first entry.
+	 */
+	return vma_find(vmi, ULONG_MAX);
+}
+
+static inline struct vm_area_struct *vma_prev(struct vma_iterator *vmi)
+{
+	return mas_prev(&vmi->mas, 0);
+}
+
+static inline unsigned long vma_iter_addr(struct vma_iterator *vmi)
+{
+	return vmi->mas.index;
+}
+
+#define for_each_vma(vmi, vma)		while ((vma = vma_next(&vmi)) != NULL)
+
+/* The MM code likes to work with exclusive end addresses */
+#define for_each_vma_range(vmi, vma, end)				\
+	while ((vma = vma_find(&vmi, end - 1)) != NULL)
+
 #ifdef CONFIG_SHMEM
 /*
  * The vma_is_shmem is not inline because it is used only by slow
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 687cb463ff6e..3cd5f8d8e3e2 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -663,6 +663,27 @@ static inline cpumask_t *mm_cpumask(struct mm_struct *mm)
 	return (struct cpumask *)&mm->cpu_bitmap;
 }
 
+struct vma_iterator {
+	struct ma_state mas;
+};
+
+#define VMA_ITERATOR(name, mm, addr) 					\
+	struct vma_iterator name = {					\
+		.mas = {						\
+			.tree = &mm->mm_mt,				\
+			.index = addr,					\
+			.node = MAS_START,				\
+		},							\
+	}
+
+static inline void vma_iter_init(struct vma_iterator *vmi,
+		struct mm_struct *mm, unsigned long addr)
+{
+	vmi->mas.tree = &mm->mm_mt;
+	vmi->mas.index = addr;
+	vmi->mas.node = MAS_START;
+}
+
 struct mmu_gather;
 extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm);
 extern void tlb_gather_mmu_fullmm(struct mmu_gather *tlb, struct mm_struct *mm);
diff --git a/mm/mmap.c b/mm/mmap.c
index a9244296b73b..4623e69e2c4d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -627,7 +627,7 @@ static int find_vma_links(struct mm_struct *mm, unsigned long addr,
 }
 
 /*
- * vma_next() - Get the next VMA.
+ * __vma_next() - Get the next VMA.
  * @mm: The mm_struct.
  * @vma: The current vma.
  *
@@ -635,7 +635,7 @@ static int find_vma_links(struct mm_struct *mm, unsigned long addr,
  *
  * Returns: The next VMA after @vma.
  */
-static inline struct vm_area_struct *vma_next(struct mm_struct *mm,
+static inline struct vm_area_struct *__vma_next(struct mm_struct *mm,
 					 struct vm_area_struct *vma)
 {
 	if (!vma)
@@ -1293,7 +1293,7 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm,
 	if (vm_flags & VM_SPECIAL)
 		return NULL;
 
-	next = vma_next(mm, prev);
+	next = __vma_next(mm, prev);
 	area = next;
 	if (area && area->vm_end == end)		/* cases 6, 7, 8 */
 		next = next->vm_next;
@@ -2812,7 +2812,7 @@ static void unmap_region(struct mm_struct *mm,
 		struct vm_area_struct *vma, struct vm_area_struct *prev,
 		unsigned long start, unsigned long end)
 {
-	struct vm_area_struct *next = vma_next(mm, prev);
+	struct vm_area_struct *next = __vma_next(mm, prev);
 	struct mmu_gather tlb;
 
 	lru_add_drain();
@@ -3025,7 +3025,7 @@ int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
 		if (error)
 			return error;
 	}
-	vma = vma_next(mm, prev);
+	vma = __vma_next(mm, prev);
 
 	if (unlikely(uf)) {
 		/*
-- 
2.34.1