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authorLiam R. Howlett <Liam.Howlett@Oracle.com>2023-01-20 11:26:46 -0500
committerAndrew Morton <akpm@linux-foundation.org>2023-02-09 16:51:38 -0800
commitcf51e86dfbe39b7cae3a9de650d035af22dd5fb4 (patch)
tree9d21cd52be3e64b5cada32f2001368af48c9039a
parent7c9813e886bb52495ff5b97d4b0f1320d36d869b (diff)
mm/mmap: don't use __vma_adjust() in shift_arg_pages()
Introduce shrink_vma() which uses the vma_prepare() and vma_complete() functions to reduce the vma coverage. Convert shift_arg_pages() to use expand_vma() and the new shrink_vma() function. Remove support from __vma_adjust() to reduce a vma size since shift_arg_pages() is the only user that shrinks a VMA in this way. Link: https://lkml.kernel.org/r/20230120162650.984577-46-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--fs/exec.c4
-rw-r--r--include/linux/mm.h10
-rw-r--r--mm/mmap.c52
3 files changed, 47 insertions, 19 deletions
diff --git a/fs/exec.c b/fs/exec.c
index d52fca2dd30b..c0df813d2b45 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -699,7 +699,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
/*
* cover the whole range: [new_start, old_end)
*/
- if (vma_adjust(&vmi, vma, new_start, old_end, vma->vm_pgoff))
+ if (vma_expand(&vmi, vma, new_start, old_end, vma->vm_pgoff, NULL))
return -ENOMEM;
/*
@@ -733,7 +733,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
vma_prev(&vmi);
/* Shrink the vma to just the new range */
- return vma_adjust(&vmi, vma, new_start, new_end, vma->vm_pgoff);
+ return vma_shrink(&vmi, vma, new_start, new_end, vma->vm_pgoff);
}
/*
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 245fb30858c9..dcc34533d2f6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2831,17 +2831,11 @@ void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
/* mmap.c */
extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
-extern int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma, unsigned long start,
- unsigned long end, pgoff_t pgoff, struct vm_area_struct *expand);
-static inline int vma_adjust(struct vma_iterator *vmi,
- struct vm_area_struct *vma, unsigned long start, unsigned long end,
- pgoff_t pgoff)
-{
- return __vma_adjust(vmi, vma, start, end, pgoff, NULL);
-}
extern int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
unsigned long start, unsigned long end, pgoff_t pgoff,
struct vm_area_struct *next);
+extern int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
+ unsigned long start, unsigned long end, pgoff_t pgoff);
extern struct vm_area_struct *vma_merge(struct vma_iterator *vmi,
struct mm_struct *, struct vm_area_struct *prev, unsigned long addr,
unsigned long end, unsigned long vm_flags, struct anon_vma *,
diff --git a/mm/mmap.c b/mm/mmap.c
index 9599db011b18..07b52acfd565 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -682,6 +682,44 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
nomem:
return -ENOMEM;
}
+
+/*
+ * vma_shrink() - Reduce an existing VMAs memory area
+ * @vmi: The vma iterator
+ * @vma: The VMA to modify
+ * @start: The new start
+ * @end: The new end
+ *
+ * Returns: 0 on success, -ENOMEM otherwise
+ */
+int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
+ unsigned long start, unsigned long end, pgoff_t pgoff)
+{
+ struct vma_prepare vp;
+
+ WARN_ON((vma->vm_start != start) && (vma->vm_end != end));
+
+ if (vma_iter_prealloc(vmi))
+ return -ENOMEM;
+
+ init_vma_prep(&vp, vma);
+ vma_adjust_trans_huge(vma, start, end, 0);
+ vma_prepare(&vp);
+
+ if (vma->vm_start < start)
+ vma_iter_clear(vmi, vma->vm_start, start);
+
+ if (vma->vm_end > end)
+ vma_iter_clear(vmi, end, vma->vm_end);
+
+ vma->vm_start = start;
+ vma->vm_end = end;
+ vma->vm_pgoff = pgoff;
+ vma_complete(&vp, vmi, vma->vm_mm);
+ validate_mm(vma->vm_mm);
+ return 0;
+}
+
/*
* We cannot adjust vm_start, vm_end, vm_pgoff fields of a vma that
* is already present in an i_mmap tree without adjusting the tree.
@@ -797,14 +835,7 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma,
vma_prepare(&vma_prep);
- if (vma->vm_start < start)
- vma_iter_clear(vmi, vma->vm_start, start);
- else if (start != vma->vm_start)
- vma_changed = true;
-
- if (vma->vm_end > end)
- vma_iter_clear(vmi, end, vma->vm_end);
- else if (end != vma->vm_end)
+ if (start < vma->vm_start || end > vma->vm_end)
vma_changed = true;
vma->vm_start = start;
@@ -817,7 +848,10 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma,
if (adjust_next) {
next->vm_start += adjust_next;
next->vm_pgoff += adjust_next >> PAGE_SHIFT;
- vma_iter_store(vmi, next);
+ if (adjust_next < 0) {
+ WARN_ON_ONCE(vma_changed);
+ vma_iter_store(vmi, next);
+ }
}
vma_complete(&vma_prep, vmi, mm);