[Concept,16/17] ext4l: bring in Kconfig and Makefile
Commit Message
From: Simon Glass <simon.glass@canonical.com>
Copy Kconfig and Makefile from Linux v6.18 fs/ext4 directory.
- Kconfig: configuration options for ext4
- Makefile: build rules
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
---
fs/ext4l/Kconfig | 92 +++++++++++++++++++++++++++++++++++++++++++++++
fs/ext4l/Makefile | 20 +++++++++++
2 files changed, 112 insertions(+)
create mode 100644 fs/ext4l/Kconfig
create mode 100644 fs/ext4l/Makefile
new file mode 100644
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config EXT4_FS
+ tristate "The Extended 4 (ext4) filesystem"
+ select BUFFER_HEAD
+ select JBD2
+ select CRC16
+ select CRC32
+ select FS_IOMAP
+ select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
+ help
+ This is the next generation of the ext3 filesystem.
+
+ Unlike the change from ext2 filesystem to ext3 filesystem,
+ the on-disk format of ext4 is not forwards compatible with
+ ext3; it is based on extent maps and it supports 48-bit
+ physical block numbers. The ext4 filesystem also supports delayed
+ allocation, persistent preallocation, high resolution time stamps,
+ and a number of other features to improve performance and speed
+ up fsck time. For more information, please see the web pages at
+ http://ext4.wiki.kernel.org.
+
+ The ext4 filesystem supports mounting an ext3 filesystem; while there
+ are some performance gains from the delayed allocation and inode
+ table readahead, the best performance gains require enabling ext4
+ features in the filesystem using tune2fs, or formatting a new
+ filesystem as an ext4 filesystem initially. Without explicit enabling
+ of ext4 features, the on disk filesystem format stays fully backward
+ compatible.
+
+ To compile this file system support as a module, choose M here. The
+ module will be called ext4.
+
+ If unsure, say N.
+
+config EXT4_USE_FOR_EXT2
+ bool "Use ext4 for ext2 file systems"
+ depends on EXT4_FS
+ depends on EXT2_FS=n
+ default y
+ help
+ Allow the ext4 file system driver code to be used for ext2
+ file system mounts. This allows users to reduce their
+ compiled kernel size by using one file system driver for
+ ext2, ext3, and ext4 file systems.
+
+config EXT4_FS_POSIX_ACL
+ bool "Ext4 POSIX Access Control Lists"
+ depends on EXT4_FS
+ select FS_POSIX_ACL
+ help
+ POSIX Access Control Lists (ACLs) support permissions for users and
+ groups beyond the owner/group/world scheme.
+
+ If you don't know what Access Control Lists are, say N
+
+config EXT4_FS_SECURITY
+ bool "Ext4 Security Labels"
+ depends on EXT4_FS
+ help
+ Security labels support alternative access control models
+ implemented by security modules like SELinux. This option
+ enables an extended attribute handler for file security
+ labels in the ext4 filesystem.
+
+ If you are not using a security module that requires using
+ extended attributes for file security labels, say N.
+
+config EXT4_DEBUG
+ bool "Ext4 debugging support"
+ depends on EXT4_FS
+ help
+ Enables run-time debugging support for the ext4 filesystem.
+
+ If you select Y here, then you will be able to turn on debugging
+ using dynamic debug control for mb_debug() / ext_debug() msgs.
+
+config EXT4_KUNIT_TESTS
+ tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS
+ depends on EXT4_FS && KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds the ext4 KUnit tests.
+
+ KUnit tests run during boot and output the results to the debug log
+ in TAP format (https://testanything.org/). Only useful for kernel devs
+ running KUnit test harness and are not for inclusion into a production
+ build.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
new file mode 100644
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the linux ext4-filesystem routines.
+#
+
+obj-$(CONFIG_EXT4_FS) += ext4.o
+
+ext4-y := balloc.o bitmap.o block_validity.o dir.o ext4_jbd2.o extents.o \
+ extents_status.o file.o fsmap.o fsync.o hash.o ialloc.o \
+ indirect.o inline.o inode.o ioctl.o mballoc.o migrate.o \
+ mmp.o move_extent.o namei.o page-io.o readpage.o resize.o \
+ super.o symlink.o sysfs.o xattr.o xattr_hurd.o xattr_trusted.o \
+ xattr_user.o fast_commit.o orphan.o
+
+ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
+ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
+ext4-inode-test-objs += inode-test.o
+obj-$(CONFIG_EXT4_KUNIT_TESTS) += ext4-inode-test.o
+ext4-$(CONFIG_FS_VERITY) += verity.o
+ext4-$(CONFIG_FS_ENCRYPTION) += crypto.o