[RFC/T PATCH 11/12] lockdep: lock_page: use per fs-type lock_page class

[Peter Zijlstra]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> 
---
 include/linux/pagemap.h |   55 +++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 10 deletions(-)

Index: linux-2.6/include/linux/pagemap.h
===================================================================
--- linux-2.6.orig/include/linux/pagemap.h
+++ linux-2.6/include/linux/pagemap.h
@@ -357,14 +357,44 @@ extern void FASTCALL(unlock_page_nocheck
 
 extern struct lockdep_map page_lockdep_map;
 
-static inline void __lock_page_acquire(int try, unsigned long ip)
+static inline struct lockdep_map *page_map(struct page *page)
 {
-	lock_acquire(&page_lockdep_map, 0, try, 0, 2, ip);
+	struct address_space *mapping;
+	struct inode *inode;
+	struct super_block *sb;
+	struct file_system_type *type;
+	struct lockdep_map *map = &page_lockdep_map;
+
+	mapping = page_mapping(page);
+	if (!mapping)
+		goto out;
+
+	inode = mapping->host;
+	if (!inode)
+		goto out;
+
+	sb = inode->i_sb;
+	if (!sb)
+		goto out;
+
+	type = sb->s_type;
+	if (type)
+		map = &type->s_mapping_map;
+
+out:
+	return map;
 }
 
-static inline void __unlock_page_release(unsigned long ip)
+static inline void __lock_page_acquire(struct page *page, int try, unsigned long ip)
 {
-	lock_release(&page_lockdep_map, 1, ip);
+	struct lockdep_map *map = page_map(page);
+	lock_acquire(map, 0, try, 0, 2, ip);
+}
+
+static inline void __unlock_page_release(struct page *page, unsigned long ip)
+{
+	struct lockdep_map *map = page_map(page);
+	lock_release(map, 1, ip);
 }
 
 /*
@@ -373,22 +403,27 @@ static inline void __unlock_page_release
 static inline void lock_page(struct page *page)
 {
 	might_sleep();
-	__lock_page_acquire(0, _RET_IP_);
+	__lock_page_acquire(page, 0, _RET_IP_);
 	if (TestSetPageLocked(page))
 		__lock_page(page);
 }
 
+static inline void __lock_page_check(struct page *page)
+{
+	__lock_page_acquire(page, 0, _RET_IP_);
+}
+
 static inline int trylock_page(struct page *page)
 {
 	int ret = !TestSetPageLocked(page);
 	if (ret)
-		__lock_page_acquire(1, _RET_IP_);
+		__lock_page_acquire(page, 1, _RET_IP_);
 	return ret;
 }
 
 static inline void __unlock_page_check(struct page *page)
 {
-	__unlock_page_release(_RET_IP_);
+	__unlock_page_release(page, _RET_IP_);
 }
 
 static inline void unlock_page(struct page *page)
@@ -404,7 +439,7 @@ static inline void unlock_page(struct pa
 static inline void lock_page_nosync(struct page *page)
 {
 	might_sleep();
-	__lock_page_acquire(0, _RET_IP_);
+	__lock_page_acquire(page, 0, _RET_IP_);
 	if (TestSetPageLocked(page))
 		__lock_page_nosync(page);
 }
@@ -424,10 +459,10 @@ extern void FASTCALL(wait_on_page_bit(st
  */
 static inline void wait_on_page_locked(struct page *page)
 {
-	__lock_page_acquire(0, _RET_IP_);
+	__lock_page_acquire(page, 0, _RET_IP_);
 	if (PageLocked(page))
 		wait_on_page_bit(page, PG_locked);
-	__unlock_page_release(_RET_IP_);
+	__unlock_page_release(page, _RET_IP_);
 }
 
 /* 

--

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