---

yaml
---
r: 329133
b: refs/heads/master
c: e3483a5
h: refs/heads/master
i:
  329131: 38489a2
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a00bb1e9fc0925c0061e9d844523a3a47a7e2f7f
+refs/heads/master: e3483a5f3a8ef448c229a2aceca9b2ad6a46b8ec

trunk/include/linux/frontswap.h

@@ -19,6 +19,8 @@ extern struct frontswap_ops
 extern void frontswap_shrink(unsigned long);
 extern unsigned long frontswap_curr_pages(void);
 extern void frontswap_writethrough(bool);
+#define FRONTSWAP_HAS_EXCLUSIVE_GETS
+extern void frontswap_tmem_exclusive_gets(bool);
 
 extern void __frontswap_init(unsigned type);
 extern int __frontswap_store(struct page *page);

trunk/mm/frontswap.c

@@ -44,6 +44,13 @@ EXPORT_SYMBOL(frontswap_enabled);
  */
 static bool frontswap_writethrough_enabled __read_mostly;
 
+/*
+ * If enabled, the underlying tmem implementation is capable of doing
+ * exclusive gets, so frontswap_load, on a successful tmem_get must
+ * mark the page as no longer in frontswap AND mark it dirty.
+ */
+static bool frontswap_tmem_exclusive_gets_enabled __read_mostly;
+
 #ifdef CONFIG_DEBUG_FS
 /*
  * Counters available via /sys/kernel/debug/frontswap (if debugfs is
@@ -96,6 +103,15 @@ void frontswap_writethrough(bool enable)
 }
 EXPORT_SYMBOL(frontswap_writethrough);
 
+/*
+ * Enable/disable frontswap exclusive gets (see above).
+ */
+void frontswap_tmem_exclusive_gets(bool enable)
+{
+	frontswap_tmem_exclusive_gets_enabled = enable;
+}
+EXPORT_SYMBOL(frontswap_tmem_exclusive_gets);
+
 /*
  * Called when a swap device is swapon'd.
  */
@@ -174,8 +190,13 @@ int __frontswap_load(struct page *page)
 	BUG_ON(sis == NULL);
 	if (frontswap_test(sis, offset))
 		ret = frontswap_ops.load(type, offset, page);
-	if (ret == 0)
+	if (ret == 0) {
 		inc_frontswap_loads();
+		if (frontswap_tmem_exclusive_gets_enabled) {
+			SetPageDirty(page);
+			frontswap_clear(sis, offset);
+		}
+	}
 	return ret;
 }
 EXPORT_SYMBOL(__frontswap_load);