[01/26] xfs: add a per-xfs trace_printk macro
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Message ID 153965940329.1256.12407610006092032283.stgit@magnolia
State New
Headers show
Series
  • fs: fixes for serious clone/dedupe problems
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Commit Message

Darrick J. Wong Oct. 16, 2018, 3:10 a.m. UTC
From: Darrick J. Wong <darrick.wong@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@oracle.com>
---
 fs/xfs/xfs_error.h |    6 ++++++
 1 file changed, 6 insertions(+)

Patch
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diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index 246d3e989c6c..5caa8bdf6c38 100644
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -76,6 +76,11 @@  extern int xfs_errortag_set(struct xfs_mount *mp, unsigned int error_tag,
 		unsigned int tag_value);
 extern int xfs_errortag_add(struct xfs_mount *mp, unsigned int error_tag);
 extern int xfs_errortag_clearall(struct xfs_mount *mp);
+
+/* 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)
 #else
 #define xfs_errortag_init(mp)			(0)
 #define xfs_errortag_del(mp)
@@ -83,6 +88,7 @@  extern int xfs_errortag_clearall(struct xfs_mount *mp);
 #define xfs_errortag_set(mp, tag, val)		(ENOSYS)
 #define xfs_errortag_add(mp, tag)		(ENOSYS)
 #define xfs_errortag_clearall(mp)		(ENOSYS)
+#define xfs_tprintk(mp, fmt, args...)		do { } while (0)
 #endif /* DEBUG */
 
 /*