[PATCH 3/3] NFS: Add a tracepoint to show the results of nfs_set_cache_invalid()

[Benjamin Coddington <bcodding@redhat.com>]

This provides some insight into the client's invalidation behavior to show
both when the client uses the helper, and the results of calling the
helper which can vary depending on how the helper is called.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
---
 fs/nfs/inode.c    | 1 +
 fs/nfs/nfstrace.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 296ed8ea3273..e4b092e40178 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -216,6 +216,7 @@ void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
 		flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
 	flags &= ~(NFS_INO_REVAL_PAGECACHE | NFS_INO_REVAL_FORCED);
 	nfsi->cache_validity |= flags;
+	trace_nfs_set_cache_invalid(inode, 0);
 }
 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
 
diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 8a224871be74..76bea172dce0 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -209,6 +209,7 @@ DEFINE_NFS_INODE_EVENT_DONE(nfs_writeback_inode_exit);
 DEFINE_NFS_INODE_EVENT(nfs_fsync_enter);
 DEFINE_NFS_INODE_EVENT_DONE(nfs_fsync_exit);
 DEFINE_NFS_INODE_EVENT(nfs_access_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_set_cache_invalid);
 
 TRACE_EVENT(nfs_access_exit,
 		TP_PROTO(
-- 
2.31.1