[XFS] Enable pagebuf lock tracking with debug config option.

SGI Modid: 2.5.x-xfs:slinx:161903a

fs/xfs/Makefile

@@ -34,6 +34,7 @@ EXTRA_CFLAGS +=	 -Ifs/xfs -funsigned-char
 
 ifeq ($(CONFIG_XFS_DEBUG),y)
 	EXTRA_CFLAGS += -g -DSTATIC="" -DDEBUG -DXFSDEBUG
+	EXTRA_CFLAGS += -DPAGEBUF_LOCK_TRACKING
 endif
 ifeq ($(CONFIG_XFS_TRACE),y)
 	EXTRA_CFLAGS += -DXFS_ALLOC_TRACE

fs/xfs/pagebuf/page_buf.h

@@ -47,11 +47,6 @@
 #include <linux/buffer_head.h>
 #include <linux/uio.h>
 
-/*
- * Turn this on to get pagebuf lock ownership
-#define PAGEBUF_LOCK_TRACKING
-*/
-
 /*
  *	Base types
  */
@@ -61,8 +56,6 @@ typedef loff_t page_buf_daddr_t;
 
 #define PAGE_BUF_DADDR_NULL ((page_buf_daddr_t) (-1LL))
 
-typedef size_t page_buf_dsize_t;		/* size of buffer in blocks */
-
 #define page_buf_ctob(pp)	((pp) * PAGE_CACHE_SIZE)
 #define page_buf_btoc(dd)	(((dd) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
 #define page_buf_btoct(dd)	((dd) >> PAGE_CACHE_SHIFT)