[PATCH 08/24] netfs: Reserve netfs_sreq_source 0 as unset/unknown

David Howells
2024-07-29T16:21:25Z

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@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.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 aada40d2182b..5e623e52e5a2 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 fc5dbd19f120..bd4f6f1f1040 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -59,6 +59,7 @@
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") \