[RFC PATCH 09/10] ftrfs: add Kconfig, Makefile and fs/ tree integration

[Aurelien DESBRIERES <aurelien@hackers.camp>]

From: Aurélien DESBRIERES <aurelien@hackers.camp>

Kconfig:
- CONFIG_FTRFS_FS: tristate, depends on BLOCK
- selects CRC32, REED_SOLOMON, REED_SOLOMON_ENC8/DEC8
- CONFIG_FTRFS_FS_XATTR: extended attributes (SELinux support)
- CONFIG_FTRFS_FS_SECURITY: security labels

Makefile:
- ftrfs.o composed of super.o, inode.o, dir.o, file.o,
  edac.o, alloc.o, namei.o
- xattr.o conditionally compiled via CONFIG_FTRFS_FS_XATTR

fs/Kconfig: source fs/ftrfs/Kconfig (after ext2)
fs/Makefile: obj-$(CONFIG_FTRFS_FS) += ftrfs/

Signed-off-by: Aurélien DESBRIERES <aurelien@hackers.camp>
---
 fs/ftrfs/Kconfig  | 49 +++++++++++++++++++++++++++++++++++++++++++++++
 fs/ftrfs/Makefile | 46 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 fs/ftrfs/Kconfig
 create mode 100644 fs/ftrfs/Makefile

diff --git a/fs/ftrfs/Kconfig b/fs/ftrfs/Kconfig
new file mode 100644
index 000000000..e23fea923
--- /dev/null
+++ b/fs/ftrfs/Kconfig
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# FTRFS filesystem configuration
+#
+
+config FTRFS_FS
+	tristate "FTRFS fault-tolerant radiation-robust filesystem"
+	depends on BLOCK
+	select CRC32
+	select REED_SOLOMON
+	select REED_SOLOMON_ENC8
+	select REED_SOLOMON_DEC8
+	help
+	  FTRFS is a POSIX-compatible filesystem designed for dependable
+	  storage in radiation-intensive environments. It provides:
+
+	    - CRC32 checksumming per block and per inode
+	    - Reed-Solomon forward error correction (FEC)
+	    - EDAC-compatible error tracking
+
+	  Originally described in:
+	  Fuchs, Langer, Trinitis - ARCS 2015, TU Munich.
+	  Targeting embedded Linux on MRAM/NOR flash for space applications.
+
+	  To compile this filesystem support as a module, choose M here.
+	  The module will be called ftrfs.
+
+	  If unsure, say N.
+
+config FTRFS_FS_XATTR
+	bool "FTRFS extended attributes"
+	depends on FTRFS_FS
+	help
+	  Extended attributes are name:value pairs associated with inodes.
+	  They are required for SELinux, POSIX ACLs, and other security
+	  frameworks that store per-file metadata outside the inode.
+	  FTRFS xattrs follow the same namespace model as ext2/ext4.
+
+	  If you are not using SELinux or POSIX ACLs, say N.
+config FTRFS_FS_SECURITY
+	bool "FTRFS Security Labels"
+	depends on FTRFS_FS_XATTR
+	help
+	  Extended attributes are name:value pairs associated with inodes.
+	  They are required for SELinux, POSIX ACLs, and other security
+	  frameworks that store per-file metadata outside the inode.
+	  FTRFS xattrs follow the same namespace model as ext2/ext4.
+
+	  If you are not using SELinux or POSIX ACLs, say N.
diff --git a/fs/ftrfs/Makefile b/fs/ftrfs/Makefile
new file mode 100644
index 000000000..a792286ec
--- /dev/null
+++ b/fs/ftrfs/Makefile
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# FTRFS — Fault-Tolerant Radiation-Robust Filesystem
+#
+
+obj-$(CONFIG_FTRFS_FS) += ftrfs.o
+
+ftrfs-y := super.o \
+            inode.o \
+            dir.o   \
+            file.o  \
+            edac.o  \
+            alloc.o \
+            namei.o
+
+ftrfs-$(CONFIG_FTRFS_FS_XATTR) += xattr.o
+
+ifneq ($(KERNELRELEASE),)
+else
+
+ifneq ($(KERNEL_SRC),)
+  KERNELDIR := $(KERNEL_SRC)
+else
+  KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+endif
+
+ifneq ($(O),)
+  KBUILD_OUTPUT := O=$(O)
+else
+  KBUILD_OUTPUT :=
+endif
+
+PWD := $(shell pwd)
+
+all:
+	$(MAKE) -C $(KERNELDIR) $(KBUILD_OUTPUT) M=$(PWD) \
+		CONFIG_FTRFS_FS=m CONFIG_FTRFS_FS_XATTR=n CONFIG_FTRFS_FS_SECURITY=n \
+		modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) $(KBUILD_OUTPUT) M=$(PWD) clean
+
+modules_install:
+	$(MAKE) -C $(KERNELDIR) $(KBUILD_OUTPUT) M=$(PWD) modules_install
+
+endif
-- 
2.52.0