[PATCH 12/24] nilfs2: introduce block mapping subsystem debugging output option

[PATCH 12/24] nilfs2: introduce block mapping subsystem debugging output option

[Vyacheslav Dubeyko]

From: Vyacheslav Dubeyko <slava@dubeyko.com>
Subject: [PATCH 12/24] nilfs2: introduce block mapping subsystem debugging output option

This patch adds subsystem's flags for alloc.c, bmap.c, btnode.c,
btree.c, direct.c modules. Flags for these modules are grouped by
CONFIG_NILFS2_DEBUG_BLOCK_MAPPING 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 |    7 +++++++
 fs/nilfs2/debug.h |   15 +++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/fs/nilfs2/Kconfig b/fs/nilfs2/Kconfig
index 5eb5140..b40fd85 100644
--- a/fs/nilfs2/Kconfig
+++ b/fs/nilfs2/Kconfig
@@ -79,6 +79,13 @@ config NILFS2_DEBUG_RECOVERY_SUBSYSTEM
 	help
 	  This option enables debugging output in recovery.c module.
 
+config NILFS2_DEBUG_BLOCK_MAPPING
+	bool "Enable block mapping subsystem debugging output"
+	default n
+	help
+	  This option enables debugging output in alloc.c, bmap.c, btnode.c,
+	  btree.c, direct.c modules.
+
 endif # NILFS2_DEBUG_SUBSYSTEMS
 
 endif # NILFS2_DEBUG
diff --git a/fs/nilfs2/debug.h b/fs/nilfs2/debug.h
index 538726d..ee712d4 100644
--- a/fs/nilfs2/debug.h
+++ b/fs/nilfs2/debug.h
@@ -71,6 +71,17 @@
  */
 #define DBG_RECOVERY	0x00010000
 
+/*
+ * These flags enable debugging output in modules that
+ * implement block mapping subsystem functionality
+ * (alloc.c, bmap.c, btnode.c, btree.c, direct.c).
+ */
+#define DBG_ALLOC	0x00020000
+#define DBG_BMAP	0x00040000
+#define DBG_BTNODE	0x00080000
+#define DBG_BTREE	0x00100000
+#define DBG_DIRECT	0x00200000
+
 #ifdef CONFIG_NILFS2_DEBUG
 
 /* Definition of flags' set for debugging */
@@ -92,6 +103,10 @@ static u32 DBG_MASK = (
 #ifdef CONFIG_NILFS2_DEBUG_RECOVERY_SUBSYSTEM
 	DBG_RECOVERY |
 #endif /* CONFIG_NILFS2_DEBUG_RECOVERY_SUBSYSTEM */
+#ifdef CONFIG_NILFS2_DEBUG_BLOCK_MAPPING
+	DBG_ALLOC | DBG_BMAP | DBG_BTNODE |
+	DBG_BTREE | DBG_DIRECT |
+#endif /* CONFIG_NILFS2_DEBUG_BLOCK_MAPPING */
 	0);
 
 #define NILFS2_SUBSYS_MASK	0x0FFFFFFF
-- 
1.7.9.5