[PATCH v3 17/38] filelock: add a tracepoint to start of break_lease()

[Jeff Layton <jlayton@kernel.org>]

...mostly to show the LEASE_BREAK_* flags.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/locks.c                      |  2 ++
 include/trace/events/filelock.h | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/fs/locks.c b/fs/locks.c
index ff5f5a85680a2c8511f5828947e829c7ffc1bd59..d26372ea890cbcd1a47209adeca6778ec23449ab 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1582,6 +1582,8 @@ int __break_lease(struct inode *inode, unsigned int flags)
 	bool want_write = !(flags & LEASE_BREAK_OPEN_RDONLY);
 	int error = 0;
 
+	trace_break_lease(inode, flags);
+
 	new_fl = lease_alloc(NULL, want_write ? F_WRLCK : F_RDLCK);
 	if (IS_ERR(new_fl))
 		return PTR_ERR(new_fl);
diff --git a/include/trace/events/filelock.h b/include/trace/events/filelock.h
index 4988804908478912c6b8044dfb3b147fc50e4823..2d45cfad18fa7b2139fb75c1aa327c00521ed9f9 100644
--- a/include/trace/events/filelock.h
+++ b/include/trace/events/filelock.h
@@ -120,6 +120,39 @@ DEFINE_EVENT(filelock_lock, flock_lock_inode,
 		TP_PROTO(struct inode *inode, struct file_lock *fl, int ret),
 		TP_ARGS(inode, fl, ret));
 
+#define show_lease_break_flags(val)					\
+	__print_flags(val, "|",						\
+		{ LEASE_BREAK_LEASE,		"LEASE" },		\
+		{ LEASE_BREAK_DELEG,		"DELEG" },		\
+		{ LEASE_BREAK_LAYOUT,		"LAYOUT" },		\
+		{ LEASE_BREAK_NONBLOCK,		"NONBLOCK" },		\
+		{ LEASE_BREAK_OPEN_RDONLY,	"OPEN_RDONLY" },	\
+		{ LEASE_BREAK_DIR_CREATE,	"DIR_CREATE" },		\
+		{ LEASE_BREAK_DIR_DELETE,	"DIR_DELETE" },		\
+		{ LEASE_BREAK_DIR_RENAME,	"DIR_RENAME" })
+
+TRACE_EVENT(break_lease,
+	TP_PROTO(struct inode *inode, unsigned int flags),
+
+	TP_ARGS(inode, flags),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, i_ino)
+		__field(dev_t, s_dev)
+		__field(unsigned int, flags)
+	),
+
+	TP_fast_assign(
+		__entry->s_dev = inode->i_sb->s_dev;
+		__entry->i_ino = inode->i_ino;
+		__entry->flags = flags;
+	),
+
+	TP_printk("dev=0x%x:0x%x ino=0x%lx flags=%s",
+		  MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
+		  __entry->i_ino, show_lease_break_flags(flags))
+);
+
 DECLARE_EVENT_CLASS(filelock_lease,
 	TP_PROTO(struct inode *inode, struct file_lease *fl),
 

-- 
2.51.0