[PATCH 02/17] fs: remove the special !CONFIG_BLOCK def_blk_fops

From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
	"Darrick J. Wong" <djwong@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Howells <dhowells@redhat.com>,
	Matthew Wilcox <willy@infradead.org>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com,
	linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH 02/17] fs: remove the special !CONFIG_BLOCK def_blk_fops
Date: Mon, 24 Apr 2023 07:49:11 +0200	[thread overview]
Message-ID: <20230424054926.26927-3-hch@lst.de> (raw)
In-Reply-To: <20230424054926.26927-1-hch@lst.de>

def_blk_fops always returns -ENODEV, which dosn't match the return value
of a non-existing block device with CONFIG_BLOCK, which is -ENXIO.
Just remove the extra implementation and fall back to the default
no_open_fops that always returns -ENXIO.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/Makefile   | 10 ++--------
 fs/inode.c    |  3 ++-
 fs/no-block.c | 19 -------------------
 3 files changed, 4 insertions(+), 28 deletions(-)
 delete mode 100644 fs/no-block.c

diff --git a/fs/Makefile b/fs/Makefile
index 05f89b5c962f88..da21e7d0a1cf37 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -18,14 +18,8 @@ obj-y :=	open.o read_write.o file_table.o super.o \
 		fs_types.o fs_context.o fs_parser.o fsopen.o init.o \
 		kernel_read_file.o mnt_idmapping.o remap_range.o
 
-ifeq ($(CONFIG_BLOCK),y)
-obj-y +=	buffer.o mpage.o
-else
-obj-y +=	no-block.o
-endif
-
-obj-$(CONFIG_PROC_FS) += proc_namespace.o
-
+obj-$(CONFIG_BLOCK)		+= buffer.o mpage.o
+obj-$(CONFIG_PROC_FS)		+= proc_namespace.o
 obj-$(CONFIG_LEGACY_DIRECT_IO)	+= direct-io.o
 obj-y				+= notify/
 obj-$(CONFIG_EPOLL)		+= eventpoll.o
diff --git a/fs/inode.c b/fs/inode.c
index 4558dc2f135573..d43f07f146eb73 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2265,7 +2265,8 @@ void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
 		inode->i_fop = &def_chr_fops;
 		inode->i_rdev = rdev;
 	} else if (S_ISBLK(mode)) {
-		inode->i_fop = &def_blk_fops;
+		if (IS_ENABLED(CONFIG_BLOCK))
+			inode->i_fop = &def_blk_fops;
 		inode->i_rdev = rdev;
 	} else if (S_ISFIFO(mode))
 		inode->i_fop = &pipefifo_fops;
diff --git a/fs/no-block.c b/fs/no-block.c
deleted file mode 100644
index 481c0f0ab4bd2c..00000000000000
--- a/fs/no-block.c
+++ /dev/null
@@ -1,19 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* no-block.c: implementation of routines required for non-BLOCK configuration
- *
- * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/kernel.h>
-#include <linux/fs.h>
-
-static int no_blkdev_open(struct inode * inode, struct file * filp)
-{
-	return -ENODEV;
-}
-
-const struct file_operations def_blk_fops = {
-	.open		= no_blkdev_open,
-	.llseek		= noop_llseek,
-};
-- 
2.39.2

