swap_info: private to swapfile.c

The swap_info_struct is mostly private to mm/swapfile.c, with only
one other in-tree user: get_swap_bio().  Adjust its interface to
map_swap_page(), so that we can then remove get_swap_info_struct().

But there is a popular user out-of-tree, TuxOnIce: so leave the
declaration of swap_info_struct in linux/swap.h.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Nigel Cunningham <ncunningham@crca.org.au>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 25 insertions, 26 deletions

diff --git a/include/linux/swap.h b/include/linux/swap.h
index abce8a0b2507..82aa7e121c05 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -318,9 +318,8 @@ extern void swapcache_free(swp_entry_t, struct page *page);
 extern int free_swap_and_cache(swp_entry_t);
 extern int swap_type_of(dev_t, sector_t, struct block_device **);
 extern unsigned int count_swap_pages(int, int);
-extern sector_t map_swap_page(struct swap_info_struct *, pgoff_t);
+extern sector_t map_swap_page(swp_entry_t, struct block_device **);
 extern sector_t swapdev_block(int, pgoff_t);
-extern struct swap_info_struct *get_swap_info_struct(unsigned);
 extern int reuse_swap_page(struct page *);
 extern int try_to_free_swap(struct page *);
 struct backing_dev_info;
diff --git a/mm/page_io.c b/mm/page_io.c
index c6f3e5071de3..afeed89a0a5d 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -19,20 +19,17 @@
 #include <linux/writeback.h>
 #include <asm/pgtable.h>
 
-static struct bio *get_swap_bio(gfp_t gfp_flags, pgoff_t index,
+static struct bio *get_swap_bio(gfp_t gfp_flags,
                                 struct page *page, bio_end_io_t end_io)
 {
         struct bio *bio;
 
         bio = bio_alloc(gfp_flags, 1);
         if (bio) {
-                struct swap_info_struct *sis;
-                swp_entry_t entry = { .val = index, };
-
-                sis = get_swap_info_struct(swp_type(entry));
-                bio->bi_sector = map_swap_page(sis, swp_offset(entry)) *
-                                        (PAGE_SIZE >> 9);
-                bio->bi_bdev = sis->bdev;
+                swp_entry_t entry;
+                entry.val = page_private(page);
+                bio->bi_sector = map_swap_page(entry, &bio->bi_bdev);
+                bio->bi_sector <<= PAGE_SHIFT - 9;
                 bio->bi_io_vec[0].bv_page = page;
                 bio->bi_io_vec[0].bv_len = PAGE_SIZE;
                 bio->bi_io_vec[0].bv_offset = 0;
@@ -102,8 +99,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
                 unlock_page(page);
                 goto out;
         }
-        bio = get_swap_bio(GFP_NOIO, page_private(page), page,
-                                end_swap_bio_write);
+        bio = get_swap_bio(GFP_NOIO, page, end_swap_bio_write);
         if (bio == NULL) {
                 set_page_dirty(page);
                 unlock_page(page);
@@ -127,8 +123,7 @@ int swap_readpage(struct page *page)
 
         VM_BUG_ON(!PageLocked(page));
         VM_BUG_ON(PageUptodate(page));
-        bio = get_swap_bio(GFP_KERNEL, page_private(page), page,
-                                end_swap_bio_read);
+        bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
         if (bio == NULL) {
                 unlock_page(page);
                 ret = -ENOMEM;
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 9c590eef7912..f83f1c6f6196 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1283,12 +1283,22 @@ static void drain_mmlist(void)
 
 /*
  * Use this swapdev's extent info to locate the (PAGE_SIZE) block which
- * corresponds to page offset `offset'.
+ * corresponds to page offset `offset'.  Note that the type of this function
+ * is sector_t, but it returns page offset into the bdev, not sector offset.
  */
-sector_t map_swap_page(struct swap_info_struct *sis, pgoff_t offset)
+sector_t map_swap_page(swp_entry_t entry, struct block_device **bdev)
 {
-        struct swap_extent *se = sis->curr_swap_extent;
-        struct swap_extent *start_se = se;
+        struct swap_info_struct *sis;
+        struct swap_extent *start_se;
+        struct swap_extent *se;
+        pgoff_t offset;
+
+        sis = swap_info + swp_type(entry);
+        *bdev = sis->bdev;
+
+        offset = swp_offset(entry);
+        start_se = sis->curr_swap_extent;
+        se = start_se;
 
         for ( ; ; ) {
                 struct list_head *lh;
@@ -1314,12 +1324,14 @@ sector_t map_swap_page(struct swap_info_struct *sis, pgoff_t offset)
 sector_t swapdev_block(int swap_type, pgoff_t offset)
 {
         struct swap_info_struct *sis;
+        struct block_device *bdev;
 
         if (swap_type >= nr_swapfiles)
                 return 0;
 
         sis = swap_info + swap_type;
-        return (sis->flags & SWP_WRITEOK) ? map_swap_page(sis, offset) : 0;
+        return (sis->flags & SWP_WRITEOK) ?
+                map_swap_page(swp_entry(swap_type, offset), &bdev) : 0;
 }
 #endif /* CONFIG_HIBERNATION */
 
@@ -2159,13 +2171,6 @@ int swapcache_prepare(swp_entry_t entry)
         return __swap_duplicate(entry, SWAP_CACHE);
 }
 
-
-struct swap_info_struct *
-get_swap_info_struct(unsigned type)
-{
-        return &swap_info[type];
-}
-
 /*
  * swap_lock prevents swap_map being freed. Don't grab an extra
  * reference on the swaphandle, it doesn't matter if it becomes unused.