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kernel-sdfat: Add to repo
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Add kernel-sdfat to repo
Patch adapted from cryptomilk/kernel-sdfat#4
Updated/Successor to exfat-nofuse module

Signed-off-by: Daniel Engberg <[email protected]>
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@diizzyy
diizzyy committed Jun 8, 2018
1 parent 48d5f1a commit dfdb5a8
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49 changes: 49 additions & 0 deletions kernel/kernel-sdfat/Makefile
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#
# Copyright (C) 2018 Daniel Engberg <[email protected]>
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#

include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk

PKG_NAME:=kernel-sdfat
PKG_VERSION:=20180522
PKG_RELEASE:=1
PKG_MAINTAINER:=
PKG_LICENSE:=GPL-2.0
PKG_LICENSE_FILES:=LICENSE

PKG_SOURCE_URL:=https://codeload.github.com/cryptomilk/$(PKG_NAME)/tar.gz/aa8183f?dummy=/
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_HASH:=17e171bd9d6cdcb617d2e92ec8c06c308108e61fdf6ff70bcb1335b59d4d2c44
PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-aa8183f

include $(INCLUDE_DIR)/package.mk

define KernelPackage/fs-sdfat
SUBMENU:=Filesystems
TITLE:=sdFAT kernel driver
FILES:=$(PKG_BUILD_DIR)/sdfat_fs.ko
AUTOLOAD:=$(call AutoLoad,30,sdfat_fs,1)
DEPENDS:=+kmod-nls-base +kmod-nls-utf8 +kmod-nls-cp437 +kmod-nls-iso8859-1 @BUILD_PATENTED
endef

define KernelPackage/fs-sdfat/description
Kernel module for FAT12/16/32/VFAT and exFAT filesytems
endef

MAKE_OPTS:= \
ARCH="$(LINUX_KARCH)" \
CROSS_COMPILE="$(TARGET_CROSS)" \
M="$(PKG_BUILD_DIR)"

define Build/Compile
$(MAKE) -C "$(LINUX_DIR)" \
$(MAKE_OPTS) \
CONFIG_SDFAT_FS=m \
modules
endef

$(eval $(call KernelPackage,fs-sdfat))

1 comment on commit dfdb5a8

@diizzyy
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@diizzyy diizzyy commented on dfdb5a8 Jun 8, 2018

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@pprindeville

Hi,
If you have a few minutes to spare I would be very grateful.

I'm a bit confused mainly because I can't find any documentation.
The module builds and runs fine but it doesn't seem to announce supported filesystems?

root@LEDE:~# cat /proc/filesystems
nodev   sysfs
nodev   rootfs
nodev   tmpfs
nodev   bdev
nodev   proc
nodev   debugfs
nodev   sockfs
nodev   bpf
nodev   pipefs
nodev   ramfs
nodev   devpts
        ext3
        ext2
        ext4
        squashfs
nodev   jffs2
nodev   overlay
        f2fs
nodev   ubifs
        sdfat

Exported supported filesystems to kernel seems to be defined here?
https://github.com/cryptomilk/kernel-sdfat/blob/master/sdfat.c#L75

It's also on by default in Kconfig but perhaps it isn't imported by default meaning that I need to define variables for make when compiling?
https://github.com/cryptomilk/kernel-sdfat/blob/master/Kconfig#L18

Essentially this seems to confuse block-mount...

Fri Jun  8 07:03:24 2018 daemon.err block: No "mount.exfat" utility available
Fri Jun  8 07:03:24 2018 daemon.err block: mounting /dev/sda1 (exfat) as /mnt/sda1 failed (2) - No such file or directory

Using busybox mount does work but it's a bit noisy because I guess it tries all(?) available filesystems unless you specify.

[  341.415388] F2FS-fs (sda1): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[  341.422222] F2FS-fs (sda1): Can't find valid F2FS filesystem in 1th superblock
[  341.429827] F2FS-fs (sda1): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[  341.436645] F2FS-fs (sda1): Can't find valid F2FS filesystem in 2th superblock
[  341.443953] F2FS-fs (sda1): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[  341.450778] F2FS-fs (sda1): Can't find valid F2FS filesystem in 1th superblock
[  341.458035] F2FS-fs (sda1): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[  341.464851] F2FS-fs (sda1): Can't find valid F2FS filesystem in 2th superblock
[  341.472582] [SDFAT](sda1[8:1]): trying to mount...
[  341.477653] [SDFAT](sda1[8:1]): set logical sector size  : 512
[  341.483514] [SDFAT](sda1[8:1]): detected volume info     : exfat (bps : 512, spc : 64, data start : 4096, aligned)
[  341.493928] [SDFAT](sda1[8:1]): detected volume size     : 7550 MB (disk_size : 7552 MB)
[  341.517224] [SDFAT](sda1[8:1]): mounted successfully!

I guess I could do a symlink to mount but that seems like a hack as other modules work fine without it.

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