2 files changed, 25 insertions, 0 deletions

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 2b3b83296977..398cbd517be2 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -72,3 +72,12 @@ config BTRFS_DEBUG
           performance, or export extra information via sysfs.
 
           If unsure, say N.
+
+config BTRFS_ASSERT
+        bool "Btrfs assert support"
+        depends on BTRFS_FS
+        help
+          Enable run-time assertion checking.  This will result in panics if
+          any of the assertions trip.  This is meant for btrfs developers only.
+
+          If unsure, say N.
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c90be01cbe67..1f3fd584e5f4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3814,6 +3814,22 @@ void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
 #define btrfs_debug(fs_info, fmt, args...) \
         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
 
+#ifdef CONFIG_BTRFS_ASSERT
+
+static inline void assfail(char *expr, char *file, int line)
+{
+        printk(KERN_ERR "BTRFS assertion failed: %s, file: %s, line: %d",
+               expr, file, line);
+        BUG();
+}
+
+#define ASSERT(expr)    \
+        (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
+#else
+#define ASSERT(expr)    ((void)0)
+#endif
+
+#define btrfs_assert()
 __printf(5, 6)
 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
                      unsigned int line, int errno, const char *fmt, ...);