linux-kernel - [PATCH 02/17] fs: remove the special !CONFIG_BLOCK def_blk

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Date:   Mon, 24 Apr 2023 07:49:11 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        ceph-devel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 02/17] fs: remove the special !CONFIG_BLOCK def_blk_fops

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@....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@...hat.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