[PATCH 5/5 -v2] miscellaneous vmufat changes and additions

[Adrian McMenamin]

Documentation/filesystems/index.rst
Update the documentation index file to link to the VMUFAT documentation..

fs/Kconfig
Update the fs Kconfig to make the VMUFAT option available.

fs/Makefile
Update the fs Makefile to allow VMUFAT to be built.

fs/vmufat/Kconfig
Advise kernel builders on whether or not to build VMUFAT code.

fs/vmufat/Makefile
Add a makefile to build the VMUFAT code as a built-in or a module.

include/uapi/linux/magic.h
0x55555555 is used mark the VMUFAT superblock, add it as an indentifying
magic number.

Signed-off-by: Adrian McMenamin <adrianmcmenamin@xxxxxxxxx>

---
 Documentation/filesystems/index.rst |  1 +
 fs/Kconfig                          |  1 +
 fs/Makefile                         |  1 +
 fs/vmufat/Kconfig                   | 14 ++++++++++++++
 fs/vmufat/Makefile                  |  7 +++++++
 include/uapi/linux/magic.h          |  1 +
 6 files changed, 25 insertions(+)
 create mode 100644 fs/vmufat/Kconfig
 create mode 100644 fs/vmufat/Makefile

diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index f4873197587d..893b585d17a9 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -120,5 +120,6 @@ Documentation for filesystem implementations.
    udf
    virtiofs
    vfat
+   vmufat
    xfs/index
    zonefs
diff --git a/fs/Kconfig b/fs/Kconfig
index 0bfdaecaa877..89a37c9c58a0 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -332,6 +332,7 @@ source "fs/pstore/Kconfig"
 source "fs/ufs/Kconfig"
 source "fs/erofs/Kconfig"
 source "fs/vboxsf/Kconfig"
+source "fs/vmufat/Kconfig"
 
 endif # MISC_FILESYSTEMS
 
diff --git a/fs/Makefile b/fs/Makefile
index cf4a745e9679..3cdc3d7b804c 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -129,3 +129,4 @@ obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
 obj-$(CONFIG_ZONEFS_FS)		+= zonefs/
 obj-$(CONFIG_BPF_LSM)		+= bpf_fs_kfuncs.o
 obj-$(CONFIG_RESCTRL_FS)	+= resctrl/
+obj-$(CONFIG_VMUFAT_FS)		+= vmufat/
diff --git a/fs/vmufat/Kconfig b/fs/vmufat/Kconfig
new file mode 100644
index 000000000000..92553a246911
--- /dev/null
+++ b/fs/vmufat/Kconfig
@@ -0,0 +1,14 @@
+config VMUFAT_FS
+	tristate "Dreamcast VMU FAT filesystem"
+	depends on BLOCK
+	help
+	  This implements the simple FAT type filesystem found on SEGA
+	  Dreamcast visual memory units.
+
+	  Dreamcast users who want to mount their VMUs to view the native
+	  filesystem will say 'Y' here. The filesystem is hardware independent
+	  but is not recommended for use in other circumstances, so just about
+	  everyone else should say 'N'.
+
+	  To compile this as a module say 'M' here. The module will be called
+	  vmufat.
diff --git a/fs/vmufat/Makefile b/fs/vmufat/Makefile
new file mode 100644
index 000000000000..da423b0c7eec
--- /dev/null
+++ b/fs/vmufat/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for VMUFAT filesystem
+#
+
+obj-$(CONFIG_VMUFAT_FS) += vmufat.o
+
+vmufat-y := inode.o super.o
diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
index 4f2da935a76c..7a3ab866ef48 100644
--- a/include/uapi/linux/magic.h
+++ b/include/uapi/linux/magic.h
@@ -54,6 +54,7 @@
 #define QNX4_SUPER_MAGIC	0x002f		/* qnx4 fs detection */
 #define QNX6_SUPER_MAGIC	0x68191122	/* qnx6 fs detection */
 #define AFS_FS_MAGIC		0x6B414653
+#define VMUFAT_SUPER_MAGIC	0x55555555  /* opening bytes of root */
 
 
 #define REISERFS_SUPER_MAGIC	0x52654973	/* used by gcc */
-- 
2.43.0