xref: /linux/fs/Kconfig (revision 8d2b0853add1d7534dc0794e3c8e0b9e8c4ec640)
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# File system configuration
4#
5
6menu "File systems"
7
8# Use unaligned word dcache accesses
9config DCACHE_WORD_ACCESS
10       bool
11
12config VALIDATE_FS_PARSER
13	bool "Validate filesystem parameter description"
14	help
15	  Enable this to perform validation of the parameter description for a
16	  filesystem when it is registered.
17
18config FS_IOMAP
19	bool
20
21# Stackable filesystems
22config FS_STACK
23	bool
24
25config BUFFER_HEAD
26	bool
27
28# old blockdev_direct_IO implementation.  Use iomap for new code instead
29config LEGACY_DIRECT_IO
30	depends on BUFFER_HEAD
31	bool
32
33if BLOCK
34
35source "fs/ext2/Kconfig"
36source "fs/ext4/Kconfig"
37source "fs/jbd2/Kconfig"
38
39config FS_MBCACHE
40# Meta block cache for Extended Attributes (ext2/ext3/ext4)
41	tristate
42	default y if EXT2_FS=y && EXT2_FS_XATTR
43	default y if EXT4_FS=y
44	default m if EXT2_FS_XATTR || EXT4_FS
45
46source "fs/jfs/Kconfig"
47
48source "fs/xfs/Kconfig"
49source "fs/gfs2/Kconfig"
50source "fs/ocfs2/Kconfig"
51source "fs/btrfs/Kconfig"
52source "fs/nilfs2/Kconfig"
53source "fs/f2fs/Kconfig"
54source "fs/bcachefs/Kconfig"
55source "fs/zonefs/Kconfig"
56
57endif # BLOCK
58
59config FS_DAX
60	bool "File system based Direct Access (DAX) support"
61	depends on MMU
62	depends on ZONE_DEVICE
63	select FS_IOMAP
64	select DAX
65	help
66	  Direct Access (DAX) can be used on memory-backed block devices.
67	  If the block device supports DAX and the filesystem supports DAX,
68	  then you can avoid using the pagecache to buffer I/Os.  Turning
69	  on this option will compile in support for DAX.
70
71	  For a DAX device to support file system access it needs to have
72	  struct pages.  For the nfit based NVDIMMs this can be enabled
73	  using the ndctl utility:
74
75		# ndctl create-namespace --force --reconfig=namespace0.0 \
76			--mode=fsdax --map=mem
77
78	  See the 'create-namespace' man page for details on the overhead of
79	  --map=mem:
80	  https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
81
82          For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
83	  file systems DAX support needs to be manually enabled globally or
84	  per-inode using a mount option as well.  See the file documentation in
85	  Documentation/filesystems/dax.rst for details.
86
87	  If you do not have a block device that is capable of using this,
88	  or if unsure, say N.  Saying Y will increase the size of the kernel
89	  by about 5kB.
90
91config FS_DAX_PMD
92	bool
93	default FS_DAX
94	depends on FS_DAX
95	depends on ZONE_DEVICE
96	depends on TRANSPARENT_HUGEPAGE
97
98# Posix ACL utility routines
99#
100# Note: Posix ACLs can be implemented without these helpers.  Never use
101# this symbol for ifdefs in core code.
102#
103config FS_POSIX_ACL
104	def_bool n
105
106config EXPORTFS
107	tristate
108
109config EXPORTFS_BLOCK_OPS
110	bool "Enable filesystem export operations for block IO"
111	help
112	  This option enables the export operations for a filesystem to support
113	  external block IO.
114
115config FILE_LOCKING
116	bool "Enable POSIX file locking API" if EXPERT
117	default y
118	help
119	  This option enables standard file locking support, required
120          for filesystems like NFS and for the flock() system
121          call. Disabling this option saves about 11k.
122
123source "fs/crypto/Kconfig"
124
125source "fs/verity/Kconfig"
126
127source "fs/notify/Kconfig"
128
129source "fs/quota/Kconfig"
130
131source "fs/autofs/Kconfig"
132source "fs/fuse/Kconfig"
133source "fs/overlayfs/Kconfig"
134
135menu "Caches"
136
137source "fs/netfs/Kconfig"
138source "fs/cachefiles/Kconfig"
139
140endmenu
141
142if BLOCK
143menu "CD-ROM/DVD Filesystems"
144
145source "fs/isofs/Kconfig"
146source "fs/udf/Kconfig"
147
148endmenu
149endif # BLOCK
150
151if BLOCK
152menu "DOS/FAT/EXFAT/NT Filesystems"
153
154source "fs/fat/Kconfig"
155source "fs/exfat/Kconfig"
156source "fs/ntfs3/Kconfig"
157
158endmenu
159endif # BLOCK
160
161menu "Pseudo filesystems"
162
163source "fs/proc/Kconfig"
164source "fs/kernfs/Kconfig"
165source "fs/sysfs/Kconfig"
166
167config TMPFS
168	bool "Tmpfs virtual memory file system support (former shm fs)"
169	depends on SHMEM
170	select MEMFD_CREATE
171	help
172	  Tmpfs is a file system which keeps all files in virtual memory.
173
174	  Everything in tmpfs is temporary in the sense that no files will be
175	  created on your hard drive. The files live in memory and swap
176	  space. If you unmount a tmpfs instance, everything stored therein is
177	  lost.
178
179	  See <file:Documentation/filesystems/tmpfs.rst> for details.
180
181config TMPFS_POSIX_ACL
182	bool "Tmpfs POSIX Access Control Lists"
183	depends on TMPFS
184	select TMPFS_XATTR
185	select FS_POSIX_ACL
186	help
187	  POSIX Access Control Lists (ACLs) support additional access rights
188	  for users and groups beyond the standard owner/group/world scheme,
189	  and this option selects support for ACLs specifically for tmpfs
190	  filesystems.
191
192	  If you've selected TMPFS, it's possible that you'll also need
193	  this option as there are a number of Linux distros that require
194	  POSIX ACL support under /dev for certain features to work properly.
195	  For example, some distros need this feature for ALSA-related /dev
196	  files for sound to work properly.  In short, if you're not sure,
197	  say Y.
198
199config TMPFS_XATTR
200	bool "Tmpfs extended attributes"
201	depends on TMPFS
202	default n
203	help
204	  Extended attributes are name:value pairs associated with inodes by
205	  the kernel or by users (see the attr(5) manual page for details).
206
207	  This enables support for the trusted.*, security.* and user.*
208	  namespaces.
209
210	  You need this for POSIX ACL support on tmpfs.
211
212	  If unsure, say N.
213
214config TMPFS_INODE64
215	bool "Use 64-bit ino_t by default in tmpfs"
216	depends on TMPFS && 64BIT
217	default n
218	help
219	  tmpfs has historically used only inode numbers as wide as an unsigned
220	  int. In some cases this can cause wraparound, potentially resulting
221	  in multiple files with the same inode number on a single device. This
222	  option makes tmpfs use the full width of ino_t by default, without
223	  needing to specify the inode64 option when mounting.
224
225	  But if a long-lived tmpfs is to be accessed by 32-bit applications so
226	  ancient that opening a file larger than 2GiB fails with EINVAL, then
227	  the INODE64 config option and inode64 mount option risk operations
228	  failing with EOVERFLOW once 33-bit inode numbers are reached.
229
230	  To override this configured default, use the inode32 or inode64
231	  option when mounting.
232
233	  If unsure, say N.
234
235config TMPFS_QUOTA
236	bool "Tmpfs quota support"
237	depends on TMPFS
238	select QUOTA
239	help
240	  Quota support allows to set per user and group limits for tmpfs
241	  usage.  Say Y to enable quota support. Once enabled you can control
242	  user and group quota enforcement with quota, usrquota and grpquota
243	  mount options.
244
245	  If unsure, say N.
246
247config ARCH_SUPPORTS_HUGETLBFS
248	def_bool n
249
250menuconfig HUGETLBFS
251	bool "HugeTLB file system support"
252	depends on ARCH_SUPPORTS_HUGETLBFS
253	depends on (SYSFS || SYSCTL)
254	select MEMFD_CREATE
255	select PADATA if SMP
256	help
257	  hugetlbfs is a filesystem backing for HugeTLB pages, based on
258	  ramfs. For architectures that support it, say Y here and read
259	  <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
260
261	  If unsure, say N.
262
263if HUGETLBFS
264config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
265	bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
266	default n
267	depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
268	help
269	  The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
270	  enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
271	  (boot command line) or hugetlb_optimize_vmemmap (sysctl).
272endif # HUGETLBFS
273
274config HUGETLB_PAGE
275	def_bool HUGETLBFS
276	select XARRAY_MULTI
277
278config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
279	def_bool HUGETLB_PAGE
280	depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
281	depends on SPARSEMEM_VMEMMAP
282	select SPARSEMEM_VMEMMAP_PREINIT if ARCH_WANT_HUGETLB_VMEMMAP_PREINIT
283
284config HUGETLB_PMD_PAGE_TABLE_SHARING
285	def_bool HUGETLB_PAGE
286	depends on ARCH_WANT_HUGE_PMD_SHARE && SPLIT_PMD_PTLOCKS
287
288config ARCH_HAS_GIGANTIC_PAGE
289	bool
290
291source "fs/configfs/Kconfig"
292source "fs/efivarfs/Kconfig"
293
294endmenu
295
296menuconfig MISC_FILESYSTEMS
297	bool "Miscellaneous filesystems"
298	default y
299	help
300	  Say Y here to get to see options for various miscellaneous
301	  filesystems, such as filesystems that came from other
302	  operating systems.
303
304	  This option alone does not add any kernel code.
305
306	  If you say N, all options in this submenu will be skipped and
307	  disabled; if unsure, say Y here.
308
309if MISC_FILESYSTEMS
310
311source "fs/orangefs/Kconfig"
312source "fs/adfs/Kconfig"
313source "fs/affs/Kconfig"
314source "fs/ecryptfs/Kconfig"
315source "fs/hfs/Kconfig"
316source "fs/hfsplus/Kconfig"
317source "fs/befs/Kconfig"
318source "fs/bfs/Kconfig"
319source "fs/efs/Kconfig"
320source "fs/jffs2/Kconfig"
321# UBIFS File system configuration
322source "fs/ubifs/Kconfig"
323source "fs/cramfs/Kconfig"
324source "fs/squashfs/Kconfig"
325source "fs/freevxfs/Kconfig"
326source "fs/minix/Kconfig"
327source "fs/omfs/Kconfig"
328source "fs/hpfs/Kconfig"
329source "fs/qnx4/Kconfig"
330source "fs/qnx6/Kconfig"
331source "fs/resctrl/Kconfig"
332source "fs/romfs/Kconfig"
333source "fs/pstore/Kconfig"
334source "fs/ufs/Kconfig"
335source "fs/erofs/Kconfig"
336source "fs/vboxsf/Kconfig"
337
338endif # MISC_FILESYSTEMS
339
340menuconfig NETWORK_FILESYSTEMS
341	bool "Network File Systems"
342	default y
343	depends on NET
344	help
345	  Say Y here to get to see options for network filesystems and
346	  filesystem-related networking code, such as NFS daemon and
347	  RPCSEC security modules.
348
349	  This option alone does not add any kernel code.
350
351	  If you say N, all options in this submenu will be skipped and
352	  disabled; if unsure, say Y here.
353
354if NETWORK_FILESYSTEMS
355
356source "fs/nfs/Kconfig"
357source "fs/nfsd/Kconfig"
358
359config GRACE_PERIOD
360	tristate
361
362config LOCKD
363	tristate
364	depends on FILE_LOCKING
365	select CRC32
366	select GRACE_PERIOD
367
368config LOCKD_V4
369	bool
370	depends on NFSD || NFS_V3
371	depends on FILE_LOCKING
372	default y
373
374config NFS_ACL_SUPPORT
375	tristate
376	select FS_POSIX_ACL
377
378config NFS_COMMON
379	bool
380	depends on NFSD || NFS_FS || LOCKD
381	default y
382
383config NFS_COMMON_LOCALIO_SUPPORT
384	tristate
385	depends on NFS_LOCALIO
386	default y if NFSD=y || NFS_FS=y
387	default m if NFSD=m && NFS_FS=m
388	select SUNRPC
389
390config NFS_LOCALIO
391	bool "NFS client and server support for LOCALIO auxiliary protocol"
392	depends on NFSD && NFS_FS
393	select NFS_COMMON_LOCALIO_SUPPORT
394	default n
395	help
396	  Some NFS servers support an auxiliary NFS LOCALIO protocol
397	  that is not an official part of the NFS protocol.
398
399	  This option enables support for the LOCALIO protocol in the
400	  kernel's NFS server and client. Enable this to permit local
401	  NFS clients to bypass the network when issuing reads and
402	  writes to the local NFS server.
403
404	  If unsure, say N.
405
406config NFS_V4_2_SSC_HELPER
407	bool
408	default y if NFS_V4_2
409
410source "net/sunrpc/Kconfig"
411source "fs/ceph/Kconfig"
412
413source "fs/smb/Kconfig"
414source "fs/coda/Kconfig"
415source "fs/afs/Kconfig"
416source "fs/9p/Kconfig"
417
418endif # NETWORK_FILESYSTEMS
419
420source "fs/nls/Kconfig"
421source "fs/dlm/Kconfig"
422source "fs/unicode/Kconfig"
423
424config IO_WQ
425	bool
426
427endmenu
428