linux-kernel - [PATCH v2 09/19] netfs: Adjust the netfs_failure tracepoint to indicate non-subreq lines

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Message-ID: <164678204587.1200972.14893513018190383961.stgit@warthog.procyon.org.uk>
Date:   Tue, 08 Mar 2022 23:27:25 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.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>,
        David Wysochanski <dwysocha@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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, linux-kernel@...r.kernel.org
Subject: [PATCH v2 09/19] netfs: Adjust the netfs_failure tracepoint to
 indicate non-subreq lines

Adjust the netfs_failure tracepoint to indicate a subrequest number of -1
when it's a full-request failure unrelated to any particular subrequest,
such as a failure to encrypt its data buffer.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-cachefs@...hat.com

Link: https://lore.kernel.org/r/164623001948.3564931.2353852999649380059.stgit@warthog.procyon.org.uk/ # v1
---

 include/trace/events/netfs.h |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index ddf34cb476dc..273ae5f6a54c 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -222,7 +222,7 @@ TRACE_EVENT(netfs_failure,
 
 	    TP_STRUCT__entry(
 		    __field(unsigned int,		rreq		)
-		    __field(unsigned short,		index		)
+		    __field(short,			index		)
 		    __field(short,			error		)
 		    __field(unsigned short,		flags		)
 		    __field(enum netfs_io_source,	source		)
@@ -234,17 +234,17 @@ TRACE_EVENT(netfs_failure,
 
 	    TP_fast_assign(
 		    __entry->rreq	= rreq->debug_id;
-		    __entry->index	= sreq ? sreq->debug_index : 0;
+		    __entry->index	= sreq ? sreq->debug_index : -1;
 		    __entry->error	= error;
 		    __entry->flags	= sreq ? sreq->flags : 0;
 		    __entry->source	= sreq ? sreq->source : NETFS_INVALID_READ;
 		    __entry->what	= what;
-		    __entry->len	= sreq ? sreq->len : 0;
+		    __entry->len	= sreq ? sreq->len : rreq->len;
 		    __entry->transferred = sreq ? sreq->transferred : 0;
 		    __entry->start	= sreq ? sreq->start : 0;
 			   ),
 
-	    TP_printk("R=%08x[%u] %s f=%02x s=%llx %zx/%zx %s e=%d",
+	    TP_printk("R=%08x[%d] %s f=%02x s=%llx %zx/%zx %s e=%d",
 		      __entry->rreq, __entry->index,
 		      __print_symbolic(__entry->source, netfs_sreq_sources),
 		      __entry->flags,