mm: let swap use exceptional entries

If swap entries are to be stored along with struct page pointers in a
radix tree, they need to be distinguished as exceptional entries.

Most of the handling of swap entries in radix tree will be contained in
shmem.c, but a few functions in filemap.c's common code need to check
for their appearance: find_get_page(), find_lock_page(),
find_get_pages() and find_get_pages_contig().

So as not to slow their fast paths, tuck those checks inside the
existing checks for unlikely radix_tree_deref_slot(); except for
find_lock_page(), where it is an added test.  And make it a BUG in
find_get_pages_tag(), which is not applied to tmpfs files.

A part of the reason for eliminating shmem_readpage() earlier, was to
minimize the places where common code would need to allow for swap
entries.

The swp_entry_t known to swapfile.c must be massaged into a slightly
different form when stored in the radix tree, just as it gets massaged
into a pte_t when stored in page tables.

In an i386 kernel this limits its information (type and page offset) to
30 bits: given 32 "types" of swapfile and 4kB pagesize, that's a maximum
swapfile size of 128GB.  Which is less than the 512GB we previously
allowed with X86_PAE (where the swap entry can occupy the entire upper
32 bits of a pte_t), but not a new limitation on 32-bit without PAE; and
there's not a new limitation on 64-bit (where swap filesize is already
limited to 16TB by a 32-bit page offset).  Thirty areas of 128GB is
probably still enough swap for a 64GB 32-bit machine.

Provide swp_to_radix_entry() and radix_to_swp_entry() conversions, and
enforce filesize limit in read_swap_header(), just as for ptes.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-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>

1 files changed, 31 insertions, 18 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index b83aebf..76bfb64 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -714,9 +714,12 @@ repeat:
 		page = radix_tree_deref_slot(pagep);
 		if (unlikely(!page))
 			goto out;
-		if (radix_tree_deref_retry(page))
+		if (radix_tree_exception(page)) {
+			if (radix_tree_exceptional_entry(page))
+				goto out;
+			/* radix_tree_deref_retry(page) */
 			goto repeat;
-
+		}
 		if (!page_cache_get_speculative(page))
 			goto repeat;
 
@@ -753,7 +756,7 @@ struct page *find_lock_page(struct address_space *mapping, pgoff_t offset)
 
 repeat:
 	page = find_get_page(mapping, offset);
-	if (page) {
+	if (page && !radix_tree_exception(page)) {
 		lock_page(page);
 		/* Has the page been truncated? */
 		if (unlikely(page->mapping != mapping)) {
@@ -849,11 +852,14 @@ repeat:
 		if (unlikely(!page))
 			continue;
 
-		/*
-		 * This can only trigger when the entry at index 0 moves out
-		 * of or back to the root: none yet gotten, safe to restart.
-		 */
-		if (radix_tree_deref_retry(page)) {
+		if (radix_tree_exception(page)) {
+			if (radix_tree_exceptional_entry(page))
+				continue;
+			/*
+			 * radix_tree_deref_retry(page):
+			 * can only trigger when entry at index 0 moves out of
+			 * or back to root: none yet gotten, safe to restart.
+			 */
 			WARN_ON(start | i);
 			goto restart;
 		}
@@ -912,12 +918,16 @@ repeat:
 		if (unlikely(!page))
 			continue;
 
-		/*
-		 * This can only trigger when the entry at index 0 moves out
-		 * of or back to the root: none yet gotten, safe to restart.
-		 */
-		if (radix_tree_deref_retry(page))
+		if (radix_tree_exception(page)) {
+			if (radix_tree_exceptional_entry(page))
+				break;
+			/*
+			 * radix_tree_deref_retry(page):
+			 * can only trigger when entry at index 0 moves out of
+			 * or back to root: none yet gotten, safe to restart.
+			 */
 			goto restart;
+		}
 
 		if (!page_cache_get_speculative(page))
 			goto repeat;
@@ -977,12 +987,15 @@ repeat:
 		if (unlikely(!page))
 			continue;
 
-		/*
-		 * This can only trigger when the entry at index 0 moves out
-		 * of or back to the root: none yet gotten, safe to restart.
-		 */
-		if (radix_tree_deref_retry(page))
+		if (radix_tree_exception(page)) {
+			BUG_ON(radix_tree_exceptional_entry(page));
+			/*
+			 * radix_tree_deref_retry(page):
+			 * can only trigger when entry at index 0 moves out of
+			 * or back to root: none yet gotten, safe to restart.
+			 */
 			goto restart;
+		}
 
 		if (!page_cache_get_speculative(page))
 			goto repeat;