[Ocfs2-devel] [PATCH 01/25] xfs: add a per-xfs trace_printk macro

[Darrick J. Wong]

From: Darrick J. Wong <darrick.wong at oracle.com>

Add a "xfs_tprintk" macro so that developers can use trace_printk to
print out arbitrary debugging information with the XFS device name
attached to the trace output.

Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 fs/xfs/xfs_error.h |    5 +++++
 1 file changed, 5 insertions(+)


diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index 246d3e989c6c..c3d9546b138c 100644
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -99,4 +99,9 @@ extern int xfs_errortag_clearall(struct xfs_mount *mp);
 #define		XFS_PTAG_SHUTDOWN_LOGERROR	0x00000040
 #define		XFS_PTAG_FSBLOCK_ZERO		0x00000080
 
+/* trace printk version of xfs_err and friends */
+#define xfs_tprintk(mp, fmt, args...) \
+	trace_printk("dev %d:%d " fmt, MAJOR((mp)->m_super->s_dev), \
+			MINOR((mp)->m_super->s_dev), ##args)
+
 #endif	/* __XFS_ERROR_H__ */