[PATCH v3 28/38] nfsd: add tracepoint to dir_event handler

[Jeff Layton]

Add some extra visibility around the fsnotify handlers.

Signed-off-by: Jeff Layton <jlay...@kernel.org>
---
 fs/nfsd/nfs4state.c |  2 ++
 fs/nfsd/trace.h     | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 
f3d3e3faf7d5f1b2ee39abb7eabd2fa406bbac21..2147b5f80ca0e650e9dbdb63de7c9af6f4bc7bff
 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -9796,6 +9796,8 @@ 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_file_fsnotify_handle_dir_event(mask, dir, name);
+
        ctx = locks_inode_context(dir);
        if (!ctx || list_empty(&ctx->flc_lease))
                return 0;
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 
01380425347b946bbf5a70a2ba10190ae4ec6303..d8b6d87f1ec09ca80fe4218fd79aaa803a316619
 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -1311,6 +1311,26 @@ TRACE_EVENT(nfsd_file_fsnotify_handle_event,
                        __entry->nlink, __entry->mode, __entry->mask)
 );
 
+TRACE_EVENT(nfsd_file_fsnotify_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->len)
+       ),
+       TP_fast_assign(
+               __entry->mask = mask;
+               __entry->s_dev = dir->i_sb->s_dev;
+               __entry->i_ino = dir->i_ino;
+               __assign_str(name);
+       ),
+       TP_printk("inode=0x%x:0x%x:0x%lx mask=0x%x name=%s",
+                       MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
+                       __entry->i_ino, __entry->mask, __get_str(name))
+);
+
 DECLARE_EVENT_CLASS(nfsd_file_gc_class,
        TP_PROTO(
                const struct nfsd_file *nf

-- 
2.51.0