xref: /openbmc/linux/fs/fat/Kconfig (revision 925c86a1)
1# SPDX-License-Identifier: GPL-2.0-only
2config FAT_FS
3	tristate
4	select BUFFER_HEAD
5	select NLS
6	select LEGACY_DIRECT_IO
7	help
8	  If you want to use one of the FAT-based file systems (the MS-DOS and
9	  VFAT (Windows 95) file systems), then you must say Y or M here
10	  to include FAT support. You will then be able to mount partitions or
11	  diskettes with FAT-based file systems and transparently access the
12	  files on them, i.e. MSDOS files will look and behave just like all
13	  other Unix files.
14
15	  This FAT support is not a file system in itself, it only provides
16	  the foundation for the other file systems. You will have to say Y or
17	  M to at least one of "MSDOS fs support" or "VFAT fs support" in
18	  order to make use of it.
19
20	  Another way to read and write MSDOS floppies and hard drive
21	  partitions from within Linux (but not transparently) is with the
22	  mtools ("man mtools") program suite. You don't need to say Y here in
23	  order to do that.
24
25	  If you need to move large files on floppies between a DOS and a
26	  Linux box, say Y here, mount the floppy under Linux with an MSDOS
27	  file system and use GNU tar's M option. GNU tar is a program
28	  available for Unix and DOS ("man tar" or "info tar").
29
30	  The FAT support will enlarge your kernel by about 37 KB. If unsure,
31	  say Y.
32
33	  To compile this as a module, choose M here: the module will be called
34	  fat.  Note that if you compile the FAT support as a module, you
35	  cannot compile any of the FAT-based file systems into the kernel
36	  -- they will have to be modules as well.
37
38config MSDOS_FS
39	tristate "MSDOS fs support"
40	select FAT_FS
41	help
42	  This allows you to mount MSDOS partitions of your hard drive (unless
43	  they are compressed; to access compressed MSDOS partitions under
44	  Linux, you can either use the DOS emulator DOSEMU, described in the
45	  DOSEMU-HOWTO, available from
46	  <https://www.tldp.org/docs.html#howto>, or try dmsdosfs in
47	  <ftp://ibiblio.org/pub/Linux/system/filesystems/dosfs/>. If you
48	  intend to use dosemu with a non-compressed MSDOS partition, say Y
49	  here) and MSDOS floppies. This means that file access becomes
50	  transparent, i.e. the MSDOS files look and behave just like all
51	  other Unix files.
52
53	  If you have Windows 95 or Windows NT installed on your MSDOS
54	  partitions, you should use the VFAT file system (say Y to "VFAT fs
55	  support" below), or you will not be able to see the long filenames
56	  generated by Windows 95 / Windows NT.
57
58	  This option will enlarge your kernel by about 7 KB. If unsure,
59	  answer Y. This will only work if you said Y to "DOS FAT fs support"
60	  as well. To compile this as a module, choose M here: the module will
61	  be called msdos.
62
63config VFAT_FS
64	tristate "VFAT (Windows-95) fs support"
65	select FAT_FS
66	help
67	  This option provides support for normal Windows file systems with
68	  long filenames.  That includes non-compressed FAT-based file systems
69	  used by Windows 95, Windows 98, Windows NT 4.0, and the Unix
70	  programs from the mtools package.
71
72	  The VFAT support enlarges your kernel by about 10 KB and it only
73	  works if you said Y to the "DOS FAT fs support" above.  Please read
74	  the file <file:Documentation/filesystems/vfat.rst> for details.  If
75	  unsure, say Y.
76
77	  To compile this as a module, choose M here: the module will be called
78	  vfat.
79
80config FAT_DEFAULT_CODEPAGE
81	int "Default codepage for FAT"
82	depends on FAT_FS
83	default 437
84	help
85	  This option should be set to the codepage of your FAT filesystems.
86	  It can be overridden with the "codepage" mount option.
87	  See <file:Documentation/filesystems/vfat.rst> for more information.
88
89config FAT_DEFAULT_IOCHARSET
90	string "Default iocharset for FAT"
91	depends on VFAT_FS
92	default "iso8859-1"
93	help
94	  Set this to the default input/output character set you'd
95	  like FAT to use. It should probably match the character set
96	  that most of your FAT filesystems use, and can be overridden
97	  with the "iocharset" mount option for FAT filesystems.
98	  Note that "utf8" is not recommended for FAT filesystems.
99	  If unsure, you shouldn't set "utf8" here - select the next option
100	  instead if you would like to use UTF-8 encoded file names by default.
101	  See <file:Documentation/filesystems/vfat.rst> for more information.
102
103	  Enable any character sets you need in File Systems/Native Language
104	  Support.
105
106config FAT_DEFAULT_UTF8
107	bool "Enable FAT UTF-8 option by default"
108	depends on VFAT_FS
109	default n
110	help
111	  Set this if you would like to have "utf8" mount option set
112	  by default when mounting FAT filesystems.
113
114	  Even if you say Y here can always disable UTF-8 for
115	  particular mount by adding "utf8=0" to mount options.
116
117	  Say Y if you use UTF-8 encoding for file names, N otherwise.
118
119	  See <file:Documentation/filesystems/vfat.rst> for more information.
120
121config FAT_KUNIT_TEST
122	tristate "Unit Tests for FAT filesystems" if !KUNIT_ALL_TESTS
123	depends on KUNIT && FAT_FS
124	default KUNIT_ALL_TESTS
125	help
126	  This builds the FAT KUnit tests
127
128	  For more information on KUnit and unit tests in general, please refer
129	  to the KUnit documentation in Documentation/dev-tools/kunit
130
131	  If unsure, say N
132