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Subject[RFC/T PATCH 11/12] lockdep: lock_page: use per fs-type lock_page class
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> 
---
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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