netdev - [PATCH v2 08/25] netfs: Reserve netfs_sreq

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Message-ID: <20240814203850.2240469-9-dhowells@redhat.com>
Date: Wed, 14 Aug 2024 21:38:28 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>,
	Steve French <smfrench@...il.com>,
	Matthew Wilcox <willy@...radead.org>
Cc: David Howells <dhowells@...hat.com>,
	Jeff Layton <jlayton@...nel.org>,
	Gao Xiang <hsiangkao@...ux.alibaba.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Marc Dionne <marc.dionne@...istor.com>,
	Paulo Alcantara <pc@...guebit.com>,
	Shyam Prasad N <sprasad@...rosoft.com>,
	Tom Talpey <tom@...pey.com>,
	Eric Van Hensbergen <ericvh@...nel.org>,
	Ilya Dryomov <idryomov@...il.com>,
	netfs@...ts.linux.dev,
	linux-afs@...ts.infradead.org,
	linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	ceph-devel@...r.kernel.org,
	v9fs@...ts.linux.dev,
	linux-erofs@...ts.ozlabs.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 08/25] netfs: Reserve netfs_sreq_source 0 as unset/unknown

Reserve the 0-valued netfs_sreq_source to mean unset or unknown so that it
can be seen in the trace as such rather than appearing as
download-from-server when it's going to get switched to something else.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
---
 include/linux/netfs.h        | 1 +
 include/trace/events/netfs.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 11fa86640d91..16834751e646 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -43,6 +43,7 @@ static inline void folio_start_private_2(struct folio *folio)
 #define NETFS_BUF_PAGECACHE_MARK XA_MARK_1	/* - Page needs wb/dirty flag wrangling */
 
 enum netfs_io_source {
+	NETFS_SOURCE_UNKNOWN,
 	NETFS_FILL_WITH_ZEROES,
 	NETFS_DOWNLOAD_FROM_SERVER,
 	NETFS_READ_FROM_CACHE,
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index a4fd5dea52f4..f4105b8e5894 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -60,6 +60,7 @@
 	E_(netfs_rreq_trace_write_done,		"WR-DONE")
 
 #define netfs_sreq_sources					\
+	EM(NETFS_SOURCE_UNKNOWN,		"----")		\
 	EM(NETFS_FILL_WITH_ZEROES,		"ZERO")		\
 	EM(NETFS_DOWNLOAD_FROM_SERVER,		"DOWN")		\
 	EM(NETFS_READ_FROM_CACHE,		"READ")		\