Provide a new swapfile method for remap_anon_pages to verify the swap
entry is mapped only in one vma before relocating the swap entry in a
different virtual address. Otherwise if the swap entry is mapped
in multiple vmas, when the page is swapped back in, it could get
mapped in a non linear way in some anon_vma.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
include/linux/swap.h | 6 ++++++
mm/swapfile.c | 13 +++++++++++++
2 files changed, 19 insertions(+)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 3d86a9a..3d7cae5 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -452,6 +452,7 @@ extern unsigned int count_swap_pages(int, int);
extern sector_t map_swap_page(struct page *, struct block_device **);
extern sector_t swapdev_block(int, pgoff_t);
extern int page_swapcount(struct page *);
+extern int swp_entry_swapcount(swp_entry_t entry);
extern struct swap_info_struct *page_swap_info(struct page *);
extern int reuse_swap_page(struct page *);
extern int try_to_free_swap(struct page *);
@@ -553,6 +554,11 @@ static inline int page_swapcount(struct page *page)
return 0;
}
+static inline int swp_entry_swapcount(swp_entry_t entry)
+{
+ return 0;
+}
+
#define reuse_swap_page(page) (page_mapcount(page) == 1)
static inline int try_to_free_swap(struct page *page)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 4c524f7..f516555 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -877,6 +877,19 @@ int page_swapcount(struct page *page)
return count;
}
+int swp_entry_swapcount(swp_entry_t entry)
+{
+ int count = 0;
+ struct swap_info_struct *p;
+
+ p = swap_info_get(entry);
+ if (p) {
+ count = swap_count(p->swap_map[swp_offset(entry)]);
+ spin_unlock(&p->lock);
+ }
+ return count;
+}
+
/*
* We can write to an anon page without COW if there are no other references
* to it. And as a side-effect, free up its swap: because the old content
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