fs/netfs: remove unused source NETFS_INVALID_WRITE

This enum choice was added by commit 16af134 ("netfs: Extend the
netfs_io_*request structs to handle writes") and its only user was
later removed by commit c245868 ("netfs: Remove the old writeback
code").

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/20250519134813.2975312-4-dhowells@redhat.com
cc: Paulo Alcantara <pc@manguebit.com>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: MaxKellermann

fs/netfs/write_collect.c

@@ -495,8 +495,6 @@ void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error,
 	case NETFS_WRITE_TO_CACHE:
 		netfs_stat(&netfs_n_wh_write_done);
 		break;
-	case NETFS_INVALID_WRITE:
-		break;
 	default:
 		BUG();
 	}

include/linux/netfs.h

@@ -48,7 +48,6 @@ enum netfs_io_source {
 	NETFS_INVALID_READ,
 	NETFS_UPLOAD_TO_SERVER,
 	NETFS_WRITE_TO_CACHE,
-	NETFS_INVALID_WRITE,
 } __mode(byte);
 
 typedef void (*netfs_io_terminated_t)(void *priv, ssize_t transferred_or_error,

include/trace/events/netfs.h

@@ -77,8 +77,7 @@
 	EM(NETFS_READ_FROM_CACHE,		"READ")		\
 	EM(NETFS_INVALID_READ,			"INVL")		\
 	EM(NETFS_UPLOAD_TO_SERVER,		"UPLD")		\
-	EM(NETFS_WRITE_TO_CACHE,		"WRIT")		\
-	E_(NETFS_INVALID_WRITE,			"INVL")
+	E_(NETFS_WRITE_TO_CACHE,		"WRIT")
 
 #define netfs_sreq_traces					\
 	EM(netfs_sreq_trace_add_donations,	"+DON ")	\