[PATCH 14/24] nilfs2: introduce buffer management subsystem debugging output option

[PATCH 14/24] nilfs2: introduce buffer management subsystem debugging output option

[Vyacheslav Dubeyko]

From: Vyacheslav Dubeyko <slava@dubeyko.com>
Subject: [PATCH 14/24] nilfs2: introduce buffer management subsystem debugging output option

This patch adds subsystem's flags for page.c module.
Flags for these modules are grouped by
CONFIG_NILFS2_DEBUG_BUFFER_MANAGEMENT kernel configuration option.
This kernel configuration option enables (or disables) debugging
output from of all above-mentioned modules.

Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
CC: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
---
 fs/nilfs2/Kconfig |    6 ++++++
 fs/nilfs2/debug.h |   10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/fs/nilfs2/Kconfig b/fs/nilfs2/Kconfig
index b40fd85..d6299c6 100644
--- a/fs/nilfs2/Kconfig
+++ b/fs/nilfs2/Kconfig
@@ -86,6 +86,12 @@ config NILFS2_DEBUG_BLOCK_MAPPING
 	  This option enables debugging output in alloc.c, bmap.c, btnode.c,
 	  btree.c, direct.c modules.
 
+config NILFS2_DEBUG_BUFFER_MANAGEMENT
+	bool "Enable buffer/page management subsystem debugging output"
+	default n
+	help
+	  This option enables debugging output in page.c module.
+
 endif # NILFS2_DEBUG_SUBSYSTEMS
 
 endif # NILFS2_DEBUG
diff --git a/fs/nilfs2/debug.h b/fs/nilfs2/debug.h
index ee712d4..517c5e8 100644
--- a/fs/nilfs2/debug.h
+++ b/fs/nilfs2/debug.h
@@ -82,6 +82,13 @@
 #define DBG_BTREE	0x00100000
 #define DBG_DIRECT	0x00200000
 
+/*
+ * These flags enable debugging output in modules that
+ * implement buffer management subsystem functionality
+ * (page.c).
+ */
+#define DBG_PAGE	0x00400000
+
 #ifdef CONFIG_NILFS2_DEBUG
 
 /* Definition of flags' set for debugging */
@@ -107,6 +114,9 @@ static u32 DBG_MASK = (
 	DBG_ALLOC | DBG_BMAP | DBG_BTNODE |
 	DBG_BTREE | DBG_DIRECT |
 #endif /* CONFIG_NILFS2_DEBUG_BLOCK_MAPPING */
+#ifdef CONFIG_NILFS2_DEBUG_BUFFER_MANAGEMENT
+	DBG_PAGE |
+#endif /* CONFIG_NILFS2_DEBUG_BUFFER_MANAGEMENT */
 	0);
 
 #define NILFS2_SUBSYS_MASK	0x0FFFFFFF
-- 
1.7.9.5