linux-kernel - Re: [PATCH v4 08/28] netfs: Provide readahead and readpage netfs helpers

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Date:   Tue, 16 Mar 2021 11:34:44 +0000
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>
Cc:     dhowells@...hat.com, Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org,
        David Wysochanski <dwysocha@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/28] netfs: Provide readahead and readpage netfs helpers

I'm going to make the code generate more information when warning about a
subread reporting having over-read (see attached).

David
---
diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index ce11ca4c32e4..765e88ee132d 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -641,7 +641,10 @@ void netfs_subreq_terminated(struct netfs_read_subrequest *subreq,
 		goto failed;
 	}
 
-	if (WARN_ON(transferred_or_error > subreq->len - subreq->transferred))
+	if (WARN(transferred_or_error > subreq->len - subreq->transferred,
+		 "R%x[%x] %zd > %zu - %zu",
+		 rreq->debug_id, subreq->debug_index,
+		 transferred_or_error, subreq->len, subreq->transferred))
 		transferred_or_error = subreq->len - subreq->transferred;
 
 	subreq->error = 0;