Exfat in linux kernel

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exFAT filesystem module for Linux kernel

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Aquarius223/exfat-Android

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README.md

This exFAT filesystem module for Linux kernel is a backport of the latest Linux mainline’s exFAT drivers by Samsung.

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-linux has been tested with all major LTS kernels ranging from v4.9 to v5.4 and the ones Canonical uses for Ubuntu: v4.9 , v4.14 , v4.19 , v5.4 and v4.15 , v5.3 , and v5.6 .

It’s also been tested with x86(i386) , x86_64(amd64) , arm32(AArch32) and arm64(AArch64) .

Linux kernels since v5.4 includes an exFAT driver, but it is an extremely outdated version from 2016. This was later revised by Samsung directly with v5.7 .

People on v5.7 kernel or higher can just use the bundled exFAT drivers.

People on v5.4+ are highly recommended to use this drivers.

Support for kernel versions lower than v4.9 were dropped for easier maintenance. For people interested in exFAT support for said kernels, please use the old branch. It still works nicely and it’s actively being shipped to production smartphones.

exfat-linux is planned to be maintained until Android devices with v5.7+ LTS kernel become more common.

● Original authorship and copyright: Samsung

● Maintainer of exfat-linux: Park Ju Hyung(arter97)

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 

This will use DKMS(Dynamic Kernel Module Support) and automatically build exFAT module for your current Ubuntu installation.

● Manually installing the module

git clone https://github.com/arter97/exfat-linux cd exfat-linux 

This will install the module to your currently running kernel.

If you’re running a v5.4+ kernel, it is highly recommended to reboot at this point to prevent the existing staging exFAT drivers to load.

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 , using git subtree or git submodule is highly recommended.

 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/ 

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.

The new base backported from mainline is not benchmarked yet.

Implementation	Base	Read	Write
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

Implementation	Base	Read	Write
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

Implementation	Base	Read	Write
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

Implementation	Base	Read	Write
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

• uid
• gid
• umask
• dmask
• fmask
• allow_utime
• iocharset
• quiet
• time_offset
  • Please refer to the vfat’s documentation.
  • 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.

  Источник

  exFAT

  exFAT (Extended File Allocation Table), a Microsoft file system optimized for flash memory storage such as USB sticks, is available to Gentoo Linux systems through a FUSE module.

  The availability of the exFAT filesystem had long been poor, because of its proprietary, unpublished specification. The situation, however, was improved after release of Linux kernel 5.7 with native exFAT driver implementation. [1]

  • 1 Installation
    • 1.1 Kernel
      • 1.1.1 Kernel 5.7 and above
      • 1.1.2 FUSE system for earlier kernels
      • 1.2.1 Kernel 5.7 and above
      • 1.2.2 FUSE system for earlier kernels
      • 2.1 Formatting
        • 2.1.1 Kernel 5.7 and above
        • 2.1.2 FUSE system for earlier kernels
        • 2.2.1 Kernel 5.7 and above
        • 2.2.2 FUSE system for earlier kernels
        • 3.1 Compatibility with macOS

        Installation

        Kernel

        Kernel 5.7 and above

        Enable exFAT support in the kernel:

        File systems ---> DOS/FAT/EXFAT/NT Filesystems ---> exFAT filesystem support

        FUSE system for earlier kernels

        Make sure support for Filesystem in Userspace (FUSE) is enabled in the kernel:

        File systems ---> FUSE (Filesystem in Userspace) support

        Emerge

        Kernel 5.7 and above

        FUSE system for earlier kernels

        Install the FUSE exfat package:

        For filesystem creation and manipulation beyond that of the mount command it is necessary to install the sys-fs/exfat-utils package:

        Usage

        Formatting

        Kernel 5.7 and above

        To create an exFAT file system, use mkfs.exfat :

        exfatprogs 1.0.4 Usage: mkfs.exfat -L | --volume-label=label Set volume label -c | --cluster-size=size(or suffixed by 'K' or 'M') Specify cluster size -b | --boundary-align=size(or suffixed by 'K' or 'M') Specify boundary alignment -f | --full-format Full format -V | --version Show version -v | --verbose Print debug -h | --help Show help

        For instance, to create it on a removable device present at /dev/sde1 while assigning «Flash» as the file system label:

        FUSE system for earlier kernels

        To create an exFAT file system, use mkfs.exfat (or the mkexfatfs command, which is synonymous):

        mkexfatfs 1.2.1 Usage: mkfs.exfat [-i volume-id] [-n label] [-p partition-first-sector] [-s sectors-per-cluster] [-V]

        For instance, to create it on a removable device present at /dev/sde1 while assigning «Flash» as the file system label:

        Mounting

        Kernel 5.7 and above

        With native support, standard mount commands work perfectly:

        FUSE system for earlier kernels

        The file system can then be mounted using the mount.exfat-fuse command:

        FUSE exfat 1.0.1 Usage: mount.exfat-fuse [-d] [-o options] [-v]

        For instance, to mount the file system created in the above example:

        To unmount, simply use the umount command:

        Integrity checking

        To check the integrity of an exFAT filesystem, use fsck.exfat :

        Troubleshooting

        Compatibility with macOS

        To allow ExFAT formatted disks to be read by macOS, the disk must use a GUID partition table, and have the Microsoft basic data flag set.

        See also

        • FAT — filesystem originally created for use with MS-DOS (and later pre-NT Microsoft Windows).
        • NTFS — a proprietary disk filesystem by Microsoft for Windows and Windows-based operating systems.
        • Ext4 — an open source disk filesystem and most recent version of the extended series of filesystems.

        References

        Источник

        ExFAT

        exFAT (Extended File Allocation Table), a Microsoft file system optimized for flash memory storage such as USB sticks, is available to Gentoo Linux systems through a FUSE module.

        The availability of the exFAT filesystem had long been poor, because of its proprietary, unpublished specification. The situation, however, was improved after release of Linux kernel 5.7 with native exFAT driver implementation. [1]

        • 1 Installation
          • 1.1 Kernel
            • 1.1.1 Kernel 5.7 and above
            • 1.1.2 FUSE system for earlier kernels
            • 1.2.1 Kernel 5.7 and above
            • 1.2.2 FUSE system for earlier kernels
            • 2.1 Formatting
              • 2.1.1 Kernel 5.7 and above
              • 2.1.2 FUSE system for earlier kernels
              • 2.2.1 Kernel 5.7 and above
              • 2.2.2 FUSE system for earlier kernels
              • 3.1 Compatibility with macOS

              Installation

              Kernel

              Kernel 5.7 and above

              Enable exFAT support in the kernel:

              File systems ---> DOS/FAT/EXFAT/NT Filesystems ---> exFAT filesystem support

              FUSE system for earlier kernels

              Make sure support for Filesystem in Userspace (FUSE) is enabled in the kernel:

              File systems ---> FUSE (Filesystem in Userspace) support

              Emerge

              Kernel 5.7 and above

              FUSE system for earlier kernels

              Install the FUSE exfat package:

              For filesystem creation and manipulation beyond that of the mount command it is necessary to install the sys-fs/exfat-utils package:

              Usage

              Formatting

              Kernel 5.7 and above

              To create an exFAT file system, use mkfs.exfat :

              exfatprogs 1.0.4 Usage: mkfs.exfat -L | --volume-label=label Set volume label -c | --cluster-size=size(or suffixed by 'K' or 'M') Specify cluster size -b | --boundary-align=size(or suffixed by 'K' or 'M') Specify boundary alignment -f | --full-format Full format -V | --version Show version -v | --verbose Print debug -h | --help Show help

              For instance, to create it on a removable device present at /dev/sde1 while assigning «Flash» as the file system label:

              FUSE system for earlier kernels

              To create an exFAT file system, use mkfs.exfat (or the mkexfatfs command, which is synonymous):

              mkexfatfs 1.2.1 Usage: mkfs.exfat [-i volume-id] [-n label] [-p partition-first-sector] [-s sectors-per-cluster] [-V]

              For instance, to create it on a removable device present at /dev/sde1 while assigning «Flash» as the file system label:

              Mounting

              Kernel 5.7 and above

              With native support, standard mount commands work perfectly:

              FUSE system for earlier kernels

              The file system can then be mounted using the mount.exfat-fuse command:

              FUSE exfat 1.0.1 Usage: mount.exfat-fuse [-d] [-o options] [-v]

              For instance, to mount the file system created in the above example:

              To unmount, simply use the umount command:

              Integrity checking

              To check the integrity of an exFAT filesystem, use fsck.exfat :

              Troubleshooting

              Compatibility with macOS

              To allow ExFAT formatted disks to be read by macOS, the disk must use a GUID partition table, and have the Microsoft basic data flag set.

              See also

              • FAT — filesystem originally created for use with MS-DOS (and later pre-NT Microsoft Windows).
              • NTFS — a proprietary disk filesystem by Microsoft for Windows and Windows-based operating systems.
              • Ext4 — an open source disk filesystem and most recent version of the extended series of filesystems.

              References

              Источник