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.. SPDX-License-Identifier: GPL-2.0
=================================
The Linux NTFS filesystem driver
=================================
.. Table of contents
- Overview
- Utilities support
- Supported mount options
Overview
========
NTFS is a Linux kernel filesystem driver that provides full read and write
support for NTFS volumes. It is designed for high performance, modern
kernel infrastructure (iomap, folio), and stable long-term maintenance.
Utilities support
=================
The NTFS utilities project, called ntfsprogs-plus, provides mkfs.ntfs,
fsck.ntfs, and other related tools (e.g., ntfsinfo, ntfsclone, etc.) for
creating, checking, and managing NTFS volumes. These utilities can be used
for filesystem testing with xfstests as well as for recovering corrupted
NTFS devices.
The project is available at:
https://github.com/ntfsprogs-plus/ntfsprogs-plus
Supported mount options
=======================
The NTFS driver supports the following mount options:
======================= ====================================================
iocharset=name Character set to use for converting between
the encoding is used for user visible filename and
16 bit Unicode characters.
nls=name Deprecated option. Still supported but please use
iocharset=name in the future.
uid=
gid=
umask= Provide default owner, group, and access mode mask.
These options work as documented in mount(8). By
default, the files/directories are owned by root
and he/she has read and write permissions, as well
as browse permission for directories. No one else
has any access permissions. I.e. the mode on all
files is by default rw------- and
for directories rwx------, a consequence of
the default fmask=0177 and dmask=0077.
Using a umask of zero will grant all permissions to
everyone, i.e. all files and directories will have
mode rwxrwxrwx.
fmask=
dmask= Instead of specifying umask which applies both to
files and directories, fmask applies only to files
and dmask only to directories.
showmeta=<BOOL>
show_sys_files=<BOOL> If show_sys_files is specified, show the system
files in directory listings. Otherwise the default
behaviour is to hide the system files.
Note that even when show_sys_files is specified,
"$MFT" will not be visible due to bugs/mis-features
in glibc. Further, note that irrespective of
show_sys_files, all files are accessible by name,
i.e. you can always do "ls -l \$UpCase" for example
to specifically show the system file containing
the Unicode upcase table.
case_sensitive=<BOOL> If case_sensitive is specified, treat all filenames
as case sensitive and create file names in
the POSIX namespace (default behavior). Note,
the Linux NTFS driver will never create short
filenames and will remove them on rename/delete of
the corresponding long file name. Note that files
remain accessible via their short file name, if it
exists.
nocase=<BOOL> If nocase is specified, treat filenames
case-insensitively.
disable_sparse=<BOOL> If disable_sparse is specified, creation of sparse
regions, i.e. holes, inside files is disabled for
the volume (for the duration of this mount only).
By default, creation of sparse regions is enabled,
which is consistent with the behaviour of
traditional Unix filesystems.
errors=opt Specify NTFS behavior on critical errors: panic,
remount the partition in read-only mode or
continue without doing anything (default behavior).
mft_zone_multiplier= Set the MFT zone multiplier for the volume (this
setting is not persistent across mounts and can be
changed from mount to mount but cannot be changed
on remount). Values of 1 to 4 are allowed, 1 being
the default. The MFT zone multiplier determines
how much space is reserved for the MFT on the
volume. If all other space is used up, then the
MFT zone will be shrunk dynamically, so this has no
impact on the amount of free space. However, it
can have an impact on performance by affecting
fragmentation of the MFT. In general use the
default. If you have a lot of small files then use
a higher value. The values have the following
meaning:
===== =================================
Value MFT zone size (% of volume size)
===== =================================
1 12.5%
2 25%
3 37.5%
4 50%
===== =================================
Note this option is irrelevant for read-only mount.
preallocated_size= Set preallocated size to optimize runlist merge
overhead with small chunck size.(64KB size by
default)
acl=<BOOL> Enable POSIX ACL support. When specified, POSIX
ACLs stored in extended attributes are enforced.
Default is off. Requires kernel config
NTFS_FS_POSIX_ACL enabled.
sys_immutable=<BOOL> Make NTFS system files (e.g. $MFT, $LogFile,
$Bitmap, $UpCase, etc.) immutable to user initiated
modifications for extra safety. Default is off.
nohidden=<BOOL> Hide files and directories marked with the Windows
"hidden" attribute. By default hidden items are
shown.
hide_dot_files=<BOOL> Hide names beginning with a dot ("."). By default
dot files are shown. When enabled, files and
directories created with a leading '.' will be
hidden from directory listings.
windows_names=<BOOL> Refuse creation/rename of files with characters or
reserved device names disallowed on Windows (e.g.
CON, NUL, AUX, COM1, LPT1, etc.). Default is off.
discard=<BOOL> Issue block device discard for clusters freed on
file deletion/truncation to inform underlying
storage.
======================= ====================================================
|
