ext4: Add configurable run-time mballoc debugging

Allow mballoc debugging to be enabled at run-time instead of just at
compile time.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 12 insertions, 4 deletions

diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index c96bb19f58f9..9db890d4d275 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -37,11 +37,19 @@
 
 /*
  */
-#define MB_DEBUG__
-#ifdef MB_DEBUG
-#define mb_debug(fmt, a...)     printk(fmt, ##a)
+#ifdef CONFIG_EXT4_DEBUG
+extern u8 mb_enable_debug;
+
+#define mb_debug(n, fmt, a...)                                          \
+        do {                                                            \
+                if ((n) <= mb_enable_debug) {                           \
+                        printk(KERN_DEBUG "(%s, %d): %s: ",             \
+                               __FILE__, __LINE__, __func__);           \
+                        printk(fmt, ## a);                              \
+                }                                                       \
+        } while (0)
 #else
-#define mb_debug(fmt, a...)
+#define mb_debug(n, fmt, a...)
 #endif
 
 /*