[PATCH v4 2/9] fs: tracepoints around multigrain timestamp events

[Jeff Layton]

Add some tracepoints around various multigrain timestamp events.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
 fs/inode.c                       |   5 ++
 fs/stat.c                        |   3 ++
 include/trace/events/timestamp.h | 109 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 117 insertions(+)

diff --git a/fs/inode.c b/fs/inode.c
index 10ed1d3d9b52..b2ff309a400a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -22,6 +22,9 @@
 #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"
 
 /*
@@ -2571,6 +2574,7 @@ struct timespec64 inode_set_ctime_to_ts(struct inode *inode, struct timespec64 t
 {
 	inode->i_ctime_sec = ts.tv_sec;
 	inode->i_ctime_nsec = ts.tv_nsec & ~I_CTIME_QUERIED;
+	trace_inode_set_ctime_to_ts(inode, &ts);
 	return ts;
 }
 EXPORT_SYMBOL(inode_set_ctime_to_ts);
@@ -2670,6 +2674,7 @@ struct timespec64 inode_set_ctime_current(struct inode *inode)
 	if (try_cmpxchg(&inode->i_ctime_nsec, &cur, now_ts.tv_nsec)) {
 		/* If swap occurred, then we're (mostly) done */
 		inode->i_ctime_sec = now_ts.tv_sec;
+		trace_ctime_ns_xchg(inode, cns, now_ts.tv_nsec, cur);
 	} else {
 		/*
 		 * Was the change due to someone marking the old ctime QUERIED?
diff --git a/fs/stat.c b/fs/stat.c
index df7fdd3afed9..552dfd67688b 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -23,6 +23,8 @@
 #include <linux/uaccess.h>
 #include <asm/unistd.h>
 
+#include <trace/events/timestamp.h>
+
 #include "internal.h"
 #include "mount.h"
 
@@ -49,6 +51,7 @@ void fill_mg_cmtime(struct kstat *stat, u32 request_mask, struct inode *inode)
 	stat->mtime = inode_get_mtime(inode);
 	stat->ctime.tv_sec = inode->i_ctime_sec;
 	stat->ctime.tv_nsec = ((u32)atomic_fetch_or(I_CTIME_QUERIED, pcn)) & ~I_CTIME_QUERIED;
+	trace_fill_mg_cmtime(inode, &stat->ctime, &stat->mtime);
 }
 EXPORT_SYMBOL(fill_mg_cmtime);
 
diff --git a/include/trace/events/timestamp.h b/include/trace/events/timestamp.h
new file mode 100644
index 000000000000..3a603190b46c
--- /dev/null
+++ b/include/trace/events/timestamp.h
@@ -0,0 +1,109 @@
+/* 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_set_ctime_to_ts,
+	TP_PROTO(struct inode *inode,
+		 struct timespec64 *ctime),
+
+	TP_ARGS(inode, ctime),
+
+	TP_STRUCT__entry(
+		__field(dev_t,			dev)
+		__field(ino_t,			ino)
+		__field(time64_t,		ctime_s)
+		__field(u32,			ctime_ns)
+		__field(u32,			gen)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->gen		= inode->i_generation;
+		__entry->ctime_s	= ctime->tv_sec;
+		__entry->ctime_ns	= ctime->tv_nsec;
+	),
+
+	TP_printk("ino=%d:%d:%ld:%u ctime=%lld.%u",
+		MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
+		__entry->ctime_s, __entry->ctime_ns
+	)
+);
+
+TRACE_EVENT(ctime_ns_xchg,
+	TP_PROTO(struct inode *inode,
+		 u32 old,
+		 u32 new,
+		 u32 cur),
+
+	TP_ARGS(inode, old, new, cur),
+
+	TP_STRUCT__entry(
+		__field(dev_t,				dev)
+		__field(ino_t,				ino)
+		__field(u32,				gen)
+		__field(u32,				old)
+		__field(u32,				new)
+		__field(u32,				cur)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->gen		= inode->i_generation;
+		__entry->old		= old;
+		__entry->new		= new;
+		__entry->cur		= cur;
+	),
+
+	TP_printk("ino=%d:%d:%ld:%u old=%u:%c new=%u cur=%u:%c",
+		MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
+		__entry->old & ~I_CTIME_QUERIED, __entry->old & I_CTIME_QUERIED ? 'Q' : '-',
+		__entry->new,
+		__entry->cur & ~I_CTIME_QUERIED, __entry->cur & I_CTIME_QUERIED ? 'Q' : '-'
+	)
+);
+
+TRACE_EVENT(fill_mg_cmtime,
+	TP_PROTO(struct inode *inode,
+		 struct timespec64 *ctime,
+		 struct timespec64 *mtime),
+
+	TP_ARGS(inode, ctime, mtime),
+
+	TP_STRUCT__entry(
+		__field(dev_t,			dev)
+		__field(ino_t,			ino)
+		__field(time64_t,		ctime_s)
+		__field(time64_t,		mtime_s)
+		__field(u32,			ctime_ns)
+		__field(u32,			mtime_ns)
+		__field(u32,			gen)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->gen		= inode->i_generation;
+		__entry->ctime_s	= ctime->tv_sec;
+		__entry->mtime_s	= mtime->tv_sec;
+		__entry->ctime_ns	= ctime->tv_nsec;
+		__entry->mtime_ns	= mtime->tv_nsec;
+	),
+
+	TP_printk("ino=%d:%d:%ld:%u ctime=%lld.%u mtime=%lld.%u",
+		MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
+		__entry->ctime_s, __entry->ctime_ns,
+		__entry->mtime_s, __entry->mtime_ns
+	)
+);
+#endif /* _TRACE_TIMESTAMP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

-- 
2.45.2