[PATCH 03/10] fs: tracepoints for inode_needs_update_time and inode_set_ctime_to_ts

[Jeff Layton <jlayton@kernel.org>]

Add a new tracepoint for when we're testing whether the timestamps need
updating, and around the update itself.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/inode.c                       |  4 +++
 include/trace/events/timestamp.h | 76 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/fs/inode.c b/fs/inode.c
index 7b0a73ed499d..5d2b0dfe48c3 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -22,6 +22,8 @@
 #include <linux/iversion.h>
 #include <linux/rw_hint.h>
 #include <trace/events/writeback.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/timestamp.h>
 #include "internal.h"
 
 /*
@@ -2096,6 +2098,7 @@ static int inode_needs_update_time(struct inode *inode)
 	if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode))
 		sync_it |= S_VERSION;
 
+	trace_inode_needs_update_time(inode, &now, &ts, sync_it);
 	return sync_it;
 }
 
@@ -2522,6 +2525,7 @@ EXPORT_SYMBOL(inode_get_ctime);
 struct timespec64 inode_set_ctime_to_ts(struct inode *inode, struct timespec64 ts)
 {
 	inode->__i_ctime = ktime_set(ts.tv_sec, ts.tv_nsec);
+	trace_inode_set_ctime_to_ts(inode, &ts);
 	return ts;
 }
 EXPORT_SYMBOL(inode_set_ctime_to_ts);
diff --git a/include/trace/events/timestamp.h b/include/trace/events/timestamp.h
new file mode 100644
index 000000000000..35ff875d3800
--- /dev/null
+++ b/include/trace/events/timestamp.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM timestamp
+
+#if !defined(_TRACE_TIMESTAMP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_TIMESTAMP_H
+
+#include <linux/tracepoint.h>
+#include <linux/fs.h>
+
+TRACE_EVENT(inode_needs_update_time,
+	TP_PROTO(struct inode *inode,
+		 struct timespec64 *now,
+		 struct timespec64 *ctime,
+		 int sync_it),
+
+	TP_ARGS(inode, now, ctime, sync_it),
+
+	TP_STRUCT__entry(
+		__field(dev_t,			dev)
+		__field(ino_t,			ino)
+		__field(time64_t,		now_sec)
+		__field(time64_t,		ctime_sec)
+		__field(long,			now_nsec)
+		__field(long,			ctime_nsec)
+		__field(int,			sync_it)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->sync_it	= sync_it;
+		__entry->now_sec	= now->tv_sec;
+		__entry->ctime_sec	= ctime->tv_sec;
+		__entry->now_nsec	= now->tv_nsec;
+		__entry->ctime_nsec	= ctime->tv_nsec;
+		__entry->sync_it	= sync_it;
+	),
+
+	TP_printk("ino=%d:%d:%ld sync_it=%d now=%llu.%ld ctime=%llu.%lu",
+		MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino,
+		__entry->sync_it,
+		__entry->now_sec, __entry->now_nsec,
+		__entry->ctime_sec, __entry->ctime_nsec
+	)
+);
+
+TRACE_EVENT(inode_set_ctime_to_ts,
+	TP_PROTO(struct inode *inode,
+		 struct timespec64 *ts),
+
+	TP_ARGS(inode, ts),
+
+	TP_STRUCT__entry(
+		__field(dev_t,			dev)
+		__field(ino_t,			ino)
+		__field(time64_t,		ts_sec)
+		__field(long,			ts_nsec)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->ts_sec		= ts->tv_sec;
+		__entry->ts_nsec	= ts->tv_nsec;
+	),
+
+	TP_printk("ino=%d:%d:%ld ts=%llu.%lu",
+		MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino,
+		__entry->ts_sec, __entry->ts_nsec
+	)
+);
+#endif /* _TRACE_TIMESTAMP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

-- 
2.45.2