fs: build the legacy direct I/O code conditionally

Add a new LEGACY_DIRECT_IO config symbol that is only selected by the
file systems that still use the legacy blockdev_direct_IO code, so that
kernels without support for those file systems don't need to build the
code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20230125065839.191256-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/Kconfig b/fs/Kconfig
index 2685a4d..e99830c 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -18,6 +18,10 @@ config VALIDATE_FS_PARSER
 config FS_IOMAP
        bool
 
+# old blockdev_direct_IO implementation.  Use iomap for new code instead
+config LEGACY_DIRECT_IO
+       bool
+
 if BLOCK
 
 source "fs/ext2/Kconfig"

diff --git a/fs/Makefile b/fs/Makefile
index 4dea178..606c029 100644 (file)
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -19,13 +19,14 @@ obj-y :=    open.o read_write.o file_table.o super.o \
                kernel_read_file.o remap_range.o
 
 ifeq ($(CONFIG_BLOCK),y)
-obj-y +=       buffer.o direct-io.o mpage.o
+obj-y +=       buffer.o mpage.o
 else
 obj-y +=       no-block.o
 endif
 
 obj-$(CONFIG_PROC_FS) += proc_namespace.o
 
+obj-$(CONFIG_LEGACY_DIRECT_IO) += direct-io.o
 obj-y                          += notify/
 obj-$(CONFIG_EPOLL)            += eventpoll.o
 obj-y                          += anon_inodes.o

diff --git a/fs/affs/Kconfig b/fs/affs/Kconfig
index eb9d0ab..962b863 100644 (file)
--- a/fs/affs/Kconfig
+++ b/fs/affs/Kconfig
@@ -2,6 +2,7 @@
 config AFFS_FS
        tristate "Amiga FFS file system support"
        depends on BLOCK
+       select LEGACY_DIRECT_IO
        help
          The Fast File System (FFS) is the common file system used on hard
          disks by Amiga(tm) systems since AmigaOS Version 1.3 (34.20).  Say Y

diff --git a/fs/exfat/Kconfig b/fs/exfat/Kconfig
index 5a65071..147edeb 100644 (file)
--- a/fs/exfat/Kconfig
+++ b/fs/exfat/Kconfig
@@ -3,6 +3,7 @@
 config EXFAT_FS
        tristate "exFAT filesystem support"
        select NLS
+       select LEGACY_DIRECT_IO
        help
          This allows you to mount devices formatted with the exFAT file system.
          exFAT is typically used on SD-Cards or USB sticks.

diff --git a/fs/ext2/Kconfig b/fs/ext2/Kconfig
index 1248ff4..77393fd 100644 (file)
--- a/fs/ext2/Kconfig
+++ b/fs/ext2/Kconfig
@@ -2,6 +2,7 @@
 config EXT2_FS
        tristate "Second extended fs support"
        select FS_IOMAP
+       select LEGACY_DIRECT_IO
        help
          Ext2 is a standard Linux file system for hard disks.
 

diff --git a/fs/fat/Kconfig b/fs/fat/Kconfig
index 238cc55..afe83b4 100644 (file)
--- a/fs/fat/Kconfig
+++ b/fs/fat/Kconfig
@@ -2,6 +2,7 @@
 config FAT_FS
        tristate
        select NLS
+       select LEGACY_DIRECT_IO
        help
          If you want to use one of the FAT-based file systems (the MS-DOS and
          VFAT (Windows 95) file systems), then you must say Y or M here

diff --git a/fs/hfs/Kconfig b/fs/hfs/Kconfig
index 129926b..d985066 100644 (file)
--- a/fs/hfs/Kconfig
+++ b/fs/hfs/Kconfig
@@ -3,6 +3,7 @@ config HFS_FS
        tristate "Apple Macintosh file system support"
        depends on BLOCK
        select NLS
+       select LEGACY_DIRECT_IO
        help
          If you say Y here, you will be able to mount Macintosh-formatted
          floppy disks and hard drive partitions with full read-write access.

diff --git a/fs/hfsplus/Kconfig b/fs/hfsplus/Kconfig
index 7d4229a..8034e78 100644 (file)
--- a/fs/hfsplus/Kconfig
+++ b/fs/hfsplus/Kconfig
@@ -4,6 +4,7 @@ config HFSPLUS_FS
        depends on BLOCK
        select NLS
        select NLS_UTF8
+       select LEGACY_DIRECT_IO
        help
          If you say Y here, you will be able to mount extended format
          Macintosh-formatted hard drive partitions with full read-write access.

diff --git a/fs/jfs/Kconfig b/fs/jfs/Kconfig
index 05cb0e8..51e856f 100644 (file)
--- a/fs/jfs/Kconfig
+++ b/fs/jfs/Kconfig
@@ -3,6 +3,7 @@ config JFS_FS
        tristate "JFS filesystem support"
        select NLS
        select CRC32
+       select LEGACY_DIRECT_IO
        help
          This is a port of IBM's Journaled Filesystem .  More information is
          available in the file <file:Documentation/admin-guide/jfs.rst>.

diff --git a/fs/nilfs2/Kconfig b/fs/nilfs2/Kconfig
index 254d102..7d59567 100644 (file)
--- a/fs/nilfs2/Kconfig
+++ b/fs/nilfs2/Kconfig
@@ -2,6 +2,7 @@
 config NILFS2_FS
        tristate "NILFS2 file system support"
        select CRC32
+       select LEGACY_DIRECT_IO
        help
          NILFS2 is a log-structured file system (LFS) supporting continuous
          snapshotting.  In addition to versioning capability of the entire

diff --git a/fs/ntfs3/Kconfig b/fs/ntfs3/Kconfig
index 6e4cbc4..96cc236 100644 (file)
--- a/fs/ntfs3/Kconfig
+++ b/fs/ntfs3/Kconfig
@@ -2,6 +2,7 @@
 config NTFS3_FS
        tristate "NTFS Read-Write file system support"
        select NLS
+       select LEGACY_DIRECT_IO
        help
          Windows OS native file system (NTFS) support up to NTFS version 3.1.
 

diff --git a/fs/ocfs2/Kconfig b/fs/ocfs2/Kconfig
index 5d11380..304d121 100644 (file)
--- a/fs/ocfs2/Kconfig
+++ b/fs/ocfs2/Kconfig
@@ -7,6 +7,7 @@ config OCFS2_FS
        select QUOTA
        select QUOTA_TREE
        select FS_POSIX_ACL
+       select LEGACY_DIRECT_IO
        help
          OCFS2 is a general purpose extent based shared disk cluster file
          system with many similarities to ext3. It supports 64 bit inode

diff --git a/fs/reiserfs/Kconfig b/fs/reiserfs/Kconfig
index 33c8b0d..4d22ecf 100644 (file)
--- a/fs/reiserfs/Kconfig
+++ b/fs/reiserfs/Kconfig
@@ -2,6 +2,7 @@
 config REISERFS_FS
        tristate "Reiserfs support (deprecated)"
        select CRC32
+       select LEGACY_DIRECT_IO
        help
          Reiserfs is deprecated and scheduled to be removed from the kernel
          in 2025. If you are still using it, please migrate to another

diff --git a/fs/udf/Kconfig b/fs/udf/Kconfig
index 26e1a49..82e8bfa 100644 (file)
--- a/fs/udf/Kconfig
+++ b/fs/udf/Kconfig
@@ -3,6 +3,7 @@ config UDF_FS
        tristate "UDF file system support"
        select CRC_ITU_T
        select NLS
+       select LEGACY_DIRECT_IO
        help
          This is a file system used on some CD-ROMs and DVDs. Since the
          file system is supported by multiple operating systems and is more