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