[PATCH STABLE 5.10 5.11] swap: fix swapfile page to sector mapping

[Anthony Iliopoulos]

commit caf6912f3f4af7232340d500a4a2008f81b93f14 upstream.

Fix block device sector offset calculation for swap page io on top of
blockdevs that provide a rw_page operation and do page-sized io directly
(without the block layer).

Currently swap_page_sector() maps a swap page into a blockdev sector by
obtaining the swap page offset (swap map slot), but ignores the swapfile
starting offset into the blockdev.

In setups where swapfiles are sitting on top of a filesystem, this
results into swapping out activity potentially overwriting filesystem
blocks that fall outside the swapfile region.

[This issue only affects swapfiles on filesystems on top of blockdevs
that implement rw_page ops (brd, zram, btt, pmem), and not on top of any
other block devices, in contrast to the upstream commit fix.]

Fixes: dd6bd0d9c7db ("swap: use bdev_read_page() / bdev_write_page()")
Cc: stable@xxxxxxxxxxxxxxx # 5.10+

Signed-off-by: Anthony Iliopoulos <ailiop@xxxxxxxx>
---
 mm/page_io.c  | 12 ++++--------
 mm/swapfile.c |  2 +-
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index 433df1263349..1541c0d6ad6e 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -37,7 +37,6 @@ static struct bio *get_swap_bio(gfp_t gfp_flags,
 
 		bio->bi_iter.bi_sector = map_swap_page(page, &bdev);
 		bio_set_dev(bio, bdev);
-		bio->bi_iter.bi_sector <<= PAGE_SHIFT - 9;
 		bio->bi_end_io = end_io;
 
 		bio_add_page(bio, page, thp_size(page), 0);
@@ -273,11 +272,6 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
 	return ret;
 }
 
-static sector_t swap_page_sector(struct page *page)
-{
-	return (sector_t)__page_file_index(page) << (PAGE_SHIFT - 9);
-}
-
 static inline void count_swpout_vm_event(struct page *page)
 {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -353,7 +347,8 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 		return ret;
 	}
 
-	ret = bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc);
+	ret = bdev_write_page(sis->bdev, map_swap_page(page, &sis->bdev),
+			      page, wbc);
 	if (!ret) {
 		count_swpout_vm_event(page);
 		return 0;
@@ -412,7 +407,8 @@ int swap_readpage(struct page *page, bool synchronous)
 	}
 
 	if (sis->flags & SWP_SYNCHRONOUS_IO) {
-		ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
+		ret = bdev_read_page(sis->bdev, map_swap_page(page, &sis->bdev),
+				     page);
 		if (!ret) {
 			if (trylock_page(page)) {
 				swap_slot_free_notify(page);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 16db9d1ebcbf..4adbb2a4a2ad 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2311,7 +2311,7 @@ sector_t map_swap_page(struct page *page, struct block_device **bdev)
 {
 	swp_entry_t entry;
 	entry.val = page_private(page);
-	return map_swap_entry(entry, bdev);
+	return map_swap_entry(entry, bdev) << (PAGE_SHIFT - 9);
 }
 
 /*
-- 
2.30.1