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fs: build the legacy direct I/O code conditionally

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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>
This commit is contained in:
Christoph Hellwig 2023-01-25 07:58:39 +01:00 committed by Jens Axboe
parent 439bc39b3c
commit 9636e650e1
14 changed files with 18 additions and 1 deletions
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4
fs/Kconfig
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@ -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"

3
fs/Makefile
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@ -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

1
fs/affs/Kconfig
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@ -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

1
fs/exfat/Kconfig
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@ -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.

1
fs/ext2/Kconfig
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@ -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.

1
fs/fat/Kconfig
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@ -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

1
fs/hfs/Kconfig
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@ -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.

1
fs/hfsplus/Kconfig
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@ -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.

1
fs/jfs/Kconfig
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@ -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>.

1
fs/nilfs2/Kconfig
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@ -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

1
fs/ntfs3/Kconfig
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@ -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.

1
fs/ocfs2/Kconfig
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@ -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

1
fs/reiserfs/Kconfig
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@ -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

1
fs/udf/Kconfig
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@ -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