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.. SPDX-License-Identifier: GPL-2.0
==================================
The Linux exFAT filesystem driver
==================================
.. Table of contents
- Overview
- Utilities support
- Supported mount options
Overview
========
exFAT is a filesystem designed for removable storage and other devices that
need to store large files. The Linux exFAT filesystem driver provides read
and write support for exFAT volumes.
To mount an exFAT volume, use the ``exfat`` filesystem type::
mount -t exfat /dev/sdX1 /mnt
Utilities support
=================
The exfatprogs project provides userspace utilities for creating, checking,
repairing, inspecting, and tuning exFAT filesystems. Use exfatprogs when
creating or checking an exFAT filesystem. For example, use ``mkfs.exfat``
to create a filesystem and ``fsck.exfat`` to check or repair one.
The project is available at:
https://github.com/exfatprogs/exfatprogs
Supported mount options
=======================
The exFAT driver supports the following mount options:
======================= ====================================================
uid=
gid= Set the owner and group of all files and
directories. The default is the uid and gid of
the process mounting the filesystem.
umask= Set the permission mask for files and directories.
The default is the umask of the process mounting
the filesystem.
dmask= Set the permission mask for directories.
fmask= Set the permission mask for files.
allow_utime= Control the permission check for changing file
timestamps. Only permission bits 0022 are used.
Permission bit 0020 allows members of the file's
group to change timestamps, and permission bit 0002
allows other users to change timestamps. The
default is derived from dmask (``~dmask & 0022``).
iocharset=name Character set used to convert between user-visible
filenames and the UTF-16 character encoding used by
exFAT. The default is
CONFIG_EXFAT_DEFAULT_IOCHARSET, which is ``utf8``
unless changed at kernel configuration time. Use
``iocharset=utf8`` for UTF-8 filename handling.
errors= Specify exFAT behavior on filesystem errors. The
value must be ``panic``, ``continue``, or
``remount-ro``. These respectively panic, continue
without changing the filesystem, or remount the
filesystem read-only. The default is
``remount-ro``.
discard Issue discard/TRIM requests to the block device
when clusters are freed. This is disabled by
default. ``nodiscard`` disables it explicitly.
keep_last_dots Keep trailing periods in path components during
lookup. Without this option, trailing periods are
stripped. Existing entries with trailing periods
can be accessed when this option is enabled, but
creating new entries with trailing periods is
rejected.
sys_tz Use the system timezone as the UTC offset when an
exFAT timestamp does not contain a valid timezone
offset. This takes precedence over time_offset.
time_offset=minutes Set the UTC offset, in minutes, used when an exFAT
timestamp does not contain a valid timezone offset.
Values from -1440 to 1440 are accepted. The default
is 0. This option is ignored when sys_tz is set.
zero_size_dir Create directories with zero size and without
allocating a cluster. This is disabled by default;
the default behavior allocates a cluster for a new
directory. ``nozero_size_dir`` disables it
explicitly.
======================= ====================================================
Deprecated mount options
------------------------
The following options are accepted for compatibility but should not be used:
``utf8``
Deprecated. Use ``iocharset=utf8`` instead.
``debug``, ``namecase=``, ``codepage=``
Deprecated and ignored by the exFAT driver.
|
