This exFAT filesystem module for Linux kernel is based on
sdFAT drivers by Samsung, which is used with their smartphone lineups.
The main objective of exfat-linux is to provide the best generic kernel drivers for exFAT. That means Samsung-specific modifications such as fat12/16/32 handlings, defrag and etc has been removed to make the code portable.
This project can be used for everyday Linux users by simply doing
make && make install. Ubuntu users can simply add a PPA and start using it, without even downloading the code. This can also be directly dropped-in to an existing Linux kernel source for building the filesystem drivers inline, which should be useful for Android kernel developers.
exfat-nofuse's development has been stale for more than a year with no clear maintainership. It's also been lacking critical upstream(which is Samsung) changes.
- Based on a totally different and newer base provided by Samsung
- Intended to keep upstream changes constantly merged
- Intended to fix breakage from newer kernels as-soon-as-possible
exfat-linux has been tested with all major LTS kernels ranging from 3.4 to 4.19 and the ones Canonical uses for Ubuntu:
It's also been tested with
● Original authorship and copyright: Samsung
● Ubuntu PPA
If you're an Ubuntu user, you can simply add a PPA repository and start using the exFAT module.
Ubuntu will handle upgrades automatically as well.
Add the exfat-linux repository
sudo add-apt-repository ppa:arter97/exfat-linux sudo apt update
Install the module
sudo apt install exfat-dkms
This will use DKMS(Dynamic Kernel Module Support) and automatically build exFAT module for your current Ubuntu installation.
● Manually installing the module
Download the code
git clone https://github.com/arter97/exfat-linux cd exfat-linux
sudo make install
This will install the module to your currently running kernel.
And finally load
sudo modprobe exfat
If you upgrade the kernel, you'll have to repeat this process.
If you want to update exfat-linux to the latest version, you'll have to repeat this process.
● Merging the drivers to existing Linux kernel source
If you're using
git subtree or
git submodule is highly recommended.
Add this repository to
menu "DOS/FAT/NT Filesystems" source "fs/fat/Kconfig" +source "fs/exfat/Kconfig" source "fs/ntfs/Kconfig" endmenu
obj-$(CONFIG_FAT_FS) += fat/ +obj-$(CONFIG_EXFAT_FS) += exfat/ obj-$(CONFIG_BFS_FS) += bfs/
And you're good to go!
For reference, existing exFAT implementations were tested and compared on a server running Ubuntu 16.04 with Linux kernel 4.14 under a contained virtual machine.
Linux 4.14 was used as higher LTS kernels don't work with exfat-nofuse at the time of testing.
fio sequential I/O
|exfat-linux||2.2.0||7042 MB/s||2173 MB/s|
|exfat-nofuse||1.2.9||6849 MB/s||1961 MB/s|
|exfat-fuse||N/A||3097 MB/s||1710 MB/s|
|ext4||N/A||7352 MB/s||3333 MB/s|
fio random I/O
|exfat-linux||2.2.0||760 MB/s||2222 MB/s|
|exfat-nofuse||1.2.9||760 MB/s||2160 MB/s|
|exfat-fuse||N/A||1.7 MB/s||1.6 MB/s|
|ext4||N/A||747 MB/s||2816 MB/s|
● NVMe device
fio sequential I/O
|exfat-linux||2.2.0||1283 MB/s||1832 MB/s|
|exfat-nofuse||1.2.9||1285 MB/s||1678 MB/s|
|exfat-fuse||N/A||751 MB/s||1464 MB/s|
|ext4||N/A||1283 MB/s||3356 MB/s|
fio random I/O
|exfat-linux||2.2.0||26 MB/s||1885 MB/s|
|exfat-nofuse||1.2.9||24 MB/s||1827 MB/s|
|exfat-fuse||N/A||1.6 MB/s||1.6 MB/s|
|ext4||N/A||29 MB/s||2821 MB/s|
- Please refer to the vfat's documentation.
namecase=1as a mount option will make exFAT operate in a case-sensitive mode.
Default is insensitive mode.
- Allow a symlink to be created under exFAT.
- Keep going on a filesystem error.
- Panic and halt the machine if an error occurs.
- Remount the filesystem read-only on an error.
- Enable the use of discard/TRIM commands to ensure flash storage doesn't run out of free blocks. This option may introduce latency penalty on file removal operations.
Delay flushing metadata, hence improving performance.
This is enabled by default, please pass
nodelayed_metato disable it.