[PATCH v5 11/21] nfsd: add tracepoint to dir_event handler

[Jeff Layton <jlayton@kernel.org>]

Add some extra visibility around the fsnotify handlers.

Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/nfs4state.c |  2 ++
 fs/nfsd/trace.h     | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 20477144475b..e00b4463c89d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -10035,6 +10035,8 @@ nfsd_handle_dir_event(u32 mask, const struct inode *dir, const void *data,
 	struct file_lock_core *flc;
 	struct nfsd_notify_event *evt;
 
+	trace_nfsd_handle_dir_event(mask, dir, name);
+
 	/* Normalize cross-dir rename events to create/delete */
 	if (mask & FS_MOVED_FROM) {
 		mask &= ~FS_MOVED_FROM;
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index ebf5677c4e73..3d0f0bd30d90 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -12,6 +12,7 @@
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/xprt.h>
 #include <trace/misc/fs.h>
+#include <trace/misc/fsnotify.h>
 #include <trace/misc/nfs.h>
 #include <trace/misc/sunrpc.h>
 
@@ -1377,6 +1378,28 @@ TRACE_EVENT(nfsd_file_fsnotify_handle_event,
 			__entry->nlink, __entry->mode, __entry->mask)
 );
 
+TRACE_EVENT(nfsd_handle_dir_event,
+	TP_PROTO(u32 mask, const struct inode *dir, const struct qstr *name),
+	TP_ARGS(mask, dir, name),
+	TP_STRUCT__entry(
+		__field(u32, mask)
+		__field(dev_t, s_dev)
+		__field(ino_t, i_ino)
+		__string_len(name, name ? name->name : NULL,
+				   name ? name->len : 0)
+	),
+	TP_fast_assign(
+		__entry->mask = mask;
+		__entry->s_dev = dir ? dir->i_sb->s_dev : 0;
+		__entry->i_ino = dir ? dir->i_ino : 0;
+		__assign_str(name);
+	),
+	TP_printk("inode=0x%x:0x%x:0x%lx mask=%s name=%s",
+			MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
+			__entry->i_ino, show_fsnotify_mask(__entry->mask),
+			__get_str(name))
+);
+
 DECLARE_EVENT_CLASS(nfsd_file_gc_class,
 	TP_PROTO(
 		const struct nfsd_file *nf

-- 
2.54.0