NFS: Trace effects of readdirplus on the dcache

Trace the effects of readdirplus on attribute and dentry revalidation.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/dir.c

@@ -754,8 +754,12 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry,
 			status = nfs_refresh_inode(d_inode(dentry), entry->fattr);
 			if (!status)
 				nfs_setsecurity(d_inode(dentry), entry->fattr);
+			trace_nfs_readdir_lookup_revalidate(d_inode(parent),
+							    dentry, 0, status);
 			goto out;
 		} else {
+			trace_nfs_readdir_lookup_revalidate_failed(
+				d_inode(parent), dentry, 0);
 			d_invalidate(dentry);
 			dput(dentry);
 			dentry = NULL;
@@ -777,6 +781,7 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry,
 		dentry = alias;
 	}
 	nfs_set_verifier(dentry, dir_verifier);
+	trace_nfs_readdir_lookup(d_inode(parent), dentry, 0);
 out:
 	dput(dentry);
 }

fs/nfs/nfstrace.h

@@ -432,6 +432,9 @@ DEFINE_NFS_LOOKUP_EVENT(nfs_lookup_enter);
 DEFINE_NFS_LOOKUP_EVENT_DONE(nfs_lookup_exit);
 DEFINE_NFS_LOOKUP_EVENT(nfs_lookup_revalidate_enter);
 DEFINE_NFS_LOOKUP_EVENT_DONE(nfs_lookup_revalidate_exit);
+DEFINE_NFS_LOOKUP_EVENT(nfs_readdir_lookup);
+DEFINE_NFS_LOOKUP_EVENT(nfs_readdir_lookup_revalidate_failed);
+DEFINE_NFS_LOOKUP_EVENT_DONE(nfs_readdir_lookup_revalidate);
 
 TRACE_EVENT(nfs_atomic_open_enter,
 		TP_PROTO(