linux/Documentation/filesystems/ntfs3.rst
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   1.. SPDX-License-Identifier: GPL-2.0
   2
   3=====
   4NTFS3
   5=====
   6
   7Summary and Features
   8====================
   9
  10NTFS3 is fully functional NTFS Read-Write driver. The driver works with NTFS
  11versions up to 3.1. File system type to use on mount is *ntfs3*.
  12
  13- This driver implements NTFS read/write support for normal, sparse and
  14  compressed files.
  15- Supports native journal replaying.
  16- Supports NFS export of mounted NTFS volumes.
  17- Supports extended attributes. Predefined extended attributes:
  18
  19        - *system.ntfs_security* gets/sets security
  20
  21                Descriptor: SECURITY_DESCRIPTOR_RELATIVE
  22
  23        - *system.ntfs_attrib* gets/sets ntfs file/dir attributes.
  24
  25          Note: Applied to empty files, this allows to switch type between
  26          sparse(0x200), compressed(0x800) and normal.
  27
  28Mount Options
  29=============
  30
  31The list below describes mount options supported by NTFS3 driver in addition to
  32generic ones. You can use every mount option with **no** option. If it is in
  33this table marked with no it means default is without **no**.
  34
  35.. flat-table::
  36   :widths: 1 5
  37   :fill-cells:
  38
  39   * - iocharset=name
  40     - This option informs the driver how to interpret path strings and
  41       translate them to Unicode and back. If this option is not set, the
  42       default codepage will be used (CONFIG_NLS_DEFAULT).
  43
  44       Example: iocharset=utf8
  45
  46   * - uid=
  47     - :rspan:`1`
  48   * - gid=
  49
  50   * - umask=
  51     - Controls the default permissions for files/directories created after
  52       the NTFS volume is mounted.
  53
  54   * - dmask=
  55     - :rspan:`1` Instead of specifying umask which applies both to files and
  56       directories, fmask applies only to files and dmask only to directories.
  57   * - fmask=
  58
  59   * - noacsrules
  60     - "No access rules" mount option sets access rights for files/folders to
  61       777 and owner/group to root. This mount option absorbs all other
  62       permissions.
  63
  64       - Permissions change for files/folders will be reported as successful,
  65         but they will remain 777.
  66
  67       - Owner/group change will be reported as successful, butthey will stay
  68         as root.
  69
  70   * - nohidden
  71     - Files with the Windows-specific HIDDEN (FILE_ATTRIBUTE_HIDDEN) attribute
  72       will not be shown under Linux.
  73
  74   * - sys_immutable
  75     - Files with the Windows-specific SYSTEM (FILE_ATTRIBUTE_SYSTEM) attribute
  76       will be marked as system immutable files.
  77
  78   * - discard
  79     - Enable support of the TRIM command for improved performance on delete
  80       operations, which is recommended for use with the solid-state drives
  81       (SSD).
  82
  83   * - force
  84     - Forces the driver to mount partitions even if volume is marked dirty.
  85       Not recommended for use.
  86
  87   * - sparse
  88     - Create new files as sparse.
  89
  90   * - showmeta
  91     - Use this parameter to show all meta-files (System Files) on a mounted
  92       NTFS partition. By default, all meta-files are hidden.
  93
  94   * - prealloc
  95     - Preallocate space for files excessively when file size is increasing on
  96       writes. Decreases fragmentation in case of parallel write operations to
  97       different files.
  98
  99   * - acl
 100     - Support POSIX ACLs (Access Control Lists). Effective if supported by
 101       Kernel. Not to be confused with NTFS ACLs. The option specified as acl
 102       enables support for POSIX ACLs.
 103
 104Todo list
 105=========
 106- Full journaling support over JBD. Currently journal replaying is supported
 107  which is not necessarily as effectice as JBD would be.
 108
 109References
 110==========
 111- Commercial version of the NTFS driver for Linux.
 112        https://www.paragon-software.com/home/ntfs-linux-professional/
 113
 114- Direct e-mail address for feedback and requests on the NTFS3 implementation.
 115        almaz.alexandrovich@paragon-software.com
 116