1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # File system configuration
4 #
5 
6 menu "File systems"
7 
8 # Use unaligned word dcache accesses
9 config DCACHE_WORD_ACCESS
10        bool
11 
12 config 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 
18 config FS_IOMAP
19 	bool
20 
21 # Stackable filesystems
22 config FS_STACK
23 	bool
24 
25 config BUFFER_HEAD
26 	bool
27 
28 # old blockdev_direct_IO implementation.  Use iomap for new code instead
29 config LEGACY_DIRECT_IO
30 	depends on BUFFER_HEAD
31 	bool
32 
33 if BLOCK
34 
35 source "fs/ext2/Kconfig"
36 source "fs/ext4/Kconfig"
37 source "fs/jbd2/Kconfig"
38 
39 config 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 
46 source "fs/reiserfs/Kconfig"
47 source "fs/jfs/Kconfig"
48 
49 source "fs/xfs/Kconfig"
50 source "fs/gfs2/Kconfig"
51 source "fs/ocfs2/Kconfig"
52 source "fs/btrfs/Kconfig"
53 source "fs/nilfs2/Kconfig"
54 source "fs/f2fs/Kconfig"
55 source "fs/bcachefs/Kconfig"
56 source "fs/zonefs/Kconfig"
57 
58 endif # BLOCK
59 
60 config FS_DAX
61 	bool "File system based Direct Access (DAX) support"
62 	depends on MMU
63 	depends on ZONE_DEVICE || FS_DAX_LIMITED
64 	select FS_IOMAP
65 	select DAX
66 	help
67 	  Direct Access (DAX) can be used on memory-backed block devices.
68 	  If the block device supports DAX and the filesystem supports DAX,
69 	  then you can avoid using the pagecache to buffer I/Os.  Turning
70 	  on this option will compile in support for DAX.
71 
72 	  For a DAX device to support file system access it needs to have
73 	  struct pages.  For the nfit based NVDIMMs this can be enabled
74 	  using the ndctl utility:
75 
76 		# ndctl create-namespace --force --reconfig=namespace0.0 \
77 			--mode=fsdax --map=mem
78 
79 	  See the 'create-namespace' man page for details on the overhead of
80 	  --map=mem:
81 	  https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
82 
83           For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
84 	  file systems DAX support needs to be manually enabled globally or
85 	  per-inode using a mount option as well.  See the file documentation in
86 	  Documentation/filesystems/dax.rst for details.
87 
88 	  If you do not have a block device that is capable of using this,
89 	  or if unsure, say N.  Saying Y will increase the size of the kernel
90 	  by about 5kB.
91 
92 config FS_DAX_PMD
93 	bool
94 	default FS_DAX
95 	depends on FS_DAX
96 	depends on ZONE_DEVICE
97 	depends on TRANSPARENT_HUGEPAGE
98 
99 # Selected by DAX drivers that do not expect filesystem DAX to support
100 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
101 # for fork() of processes with MAP_SHARED mappings or support for
102 # direct-I/O to a DAX mapping.
103 config FS_DAX_LIMITED
104 	bool
105 
106 # Posix ACL utility routines
107 #
108 # Note: Posix ACLs can be implemented without these helpers.  Never use
109 # this symbol for ifdefs in core code.
110 #
111 config FS_POSIX_ACL
112 	def_bool n
113 
114 config EXPORTFS
115 	tristate
116 
117 config EXPORTFS_BLOCK_OPS
118 	bool "Enable filesystem export operations for block IO"
119 	help
120 	  This option enables the export operations for a filesystem to support
121 	  external block IO.
122 
123 config FILE_LOCKING
124 	bool "Enable POSIX file locking API" if EXPERT
125 	default y
126 	help
127 	  This option enables standard file locking support, required
128           for filesystems like NFS and for the flock() system
129           call. Disabling this option saves about 11k.
130 
131 source "fs/crypto/Kconfig"
132 
133 source "fs/verity/Kconfig"
134 
135 source "fs/notify/Kconfig"
136 
137 source "fs/quota/Kconfig"
138 
139 source "fs/autofs/Kconfig"
140 source "fs/fuse/Kconfig"
141 source "fs/overlayfs/Kconfig"
142 
143 menu "Caches"
144 
145 source "fs/netfs/Kconfig"
146 source "fs/cachefiles/Kconfig"
147 
148 endmenu
149 
150 if BLOCK
151 menu "CD-ROM/DVD Filesystems"
152 
153 source "fs/isofs/Kconfig"
154 source "fs/udf/Kconfig"
155 
156 endmenu
157 endif # BLOCK
158 
159 if BLOCK
160 menu "DOS/FAT/EXFAT/NT Filesystems"
161 
162 source "fs/fat/Kconfig"
163 source "fs/exfat/Kconfig"
164 source "fs/ntfs3/Kconfig"
165 
166 endmenu
167 endif # BLOCK
168 
169 menu "Pseudo filesystems"
170 
171 source "fs/proc/Kconfig"
172 source "fs/kernfs/Kconfig"
173 source "fs/sysfs/Kconfig"
174 
175 config TMPFS
176 	bool "Tmpfs virtual memory file system support (former shm fs)"
177 	depends on SHMEM
178 	select MEMFD_CREATE
179 	help
180 	  Tmpfs is a file system which keeps all files in virtual memory.
181 
182 	  Everything in tmpfs is temporary in the sense that no files will be
183 	  created on your hard drive. The files live in memory and swap
184 	  space. If you unmount a tmpfs instance, everything stored therein is
185 	  lost.
186 
187 	  See <file:Documentation/filesystems/tmpfs.rst> for details.
188 
189 config TMPFS_POSIX_ACL
190 	bool "Tmpfs POSIX Access Control Lists"
191 	depends on TMPFS
192 	select TMPFS_XATTR
193 	select FS_POSIX_ACL
194 	help
195 	  POSIX Access Control Lists (ACLs) support additional access rights
196 	  for users and groups beyond the standard owner/group/world scheme,
197 	  and this option selects support for ACLs specifically for tmpfs
198 	  filesystems.
199 
200 	  If you've selected TMPFS, it's possible that you'll also need
201 	  this option as there are a number of Linux distros that require
202 	  POSIX ACL support under /dev for certain features to work properly.
203 	  For example, some distros need this feature for ALSA-related /dev
204 	  files for sound to work properly.  In short, if you're not sure,
205 	  say Y.
206 
207 config TMPFS_XATTR
208 	bool "Tmpfs extended attributes"
209 	depends on TMPFS
210 	default n
211 	help
212 	  Extended attributes are name:value pairs associated with inodes by
213 	  the kernel or by users (see the attr(5) manual page for details).
214 
215 	  This enables support for the trusted.*, security.* and user.*
216 	  namespaces.
217 
218 	  You need this for POSIX ACL support on tmpfs.
219 
220 	  If unsure, say N.
221 
222 config TMPFS_INODE64
223 	bool "Use 64-bit ino_t by default in tmpfs"
224 	depends on TMPFS && 64BIT
225 	default n
226 	help
227 	  tmpfs has historically used only inode numbers as wide as an unsigned
228 	  int. In some cases this can cause wraparound, potentially resulting
229 	  in multiple files with the same inode number on a single device. This
230 	  option makes tmpfs use the full width of ino_t by default, without
231 	  needing to specify the inode64 option when mounting.
232 
233 	  But if a long-lived tmpfs is to be accessed by 32-bit applications so
234 	  ancient that opening a file larger than 2GiB fails with EINVAL, then
235 	  the INODE64 config option and inode64 mount option risk operations
236 	  failing with EOVERFLOW once 33-bit inode numbers are reached.
237 
238 	  To override this configured default, use the inode32 or inode64
239 	  option when mounting.
240 
241 	  If unsure, say N.
242 
243 config TMPFS_QUOTA
244 	bool "Tmpfs quota support"
245 	depends on TMPFS
246 	select QUOTA
247 	help
248 	  Quota support allows to set per user and group limits for tmpfs
249 	  usage.  Say Y to enable quota support. Once enabled you can control
250 	  user and group quota enforcement with quota, usrquota and grpquota
251 	  mount options.
252 
253 	  If unsure, say N.
254 
255 config ARCH_SUPPORTS_HUGETLBFS
256 	def_bool n
257 
258 menuconfig HUGETLBFS
259 	bool "HugeTLB file system support"
260 	depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
261 	depends on (SYSFS || SYSCTL)
262 	select MEMFD_CREATE
263 	select PADATA if SMP
264 	help
265 	  hugetlbfs is a filesystem backing for HugeTLB pages, based on
266 	  ramfs. For architectures that support it, say Y here and read
267 	  <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
268 
269 	  If unsure, say N.
270 
271 if HUGETLBFS
272 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
273 	bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
274 	default n
275 	depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
276 	help
277 	  The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
278 	  enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
279 	  (boot command line) or hugetlb_optimize_vmemmap (sysctl).
280 endif # HUGETLBFS
281 
282 config HUGETLB_PAGE
283 	def_bool HUGETLBFS
284 	select XARRAY_MULTI
285 
286 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
287 	def_bool HUGETLB_PAGE
288 	depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
289 	depends on SPARSEMEM_VMEMMAP
290 
291 config HUGETLB_PMD_PAGE_TABLE_SHARING
292 	def_bool HUGETLB_PAGE
293 	depends on ARCH_WANT_HUGE_PMD_SHARE && SPLIT_PMD_PTLOCKS
294 
295 config ARCH_HAS_GIGANTIC_PAGE
296 	bool
297 
298 source "fs/configfs/Kconfig"
299 source "fs/efivarfs/Kconfig"
300 
301 endmenu
302 
303 menuconfig MISC_FILESYSTEMS
304 	bool "Miscellaneous filesystems"
305 	default y
306 	help
307 	  Say Y here to get to see options for various miscellaneous
308 	  filesystems, such as filesystems that came from other
309 	  operating systems.
310 
311 	  This option alone does not add any kernel code.
312 
313 	  If you say N, all options in this submenu will be skipped and
314 	  disabled; if unsure, say Y here.
315 
316 if MISC_FILESYSTEMS
317 
318 source "fs/orangefs/Kconfig"
319 source "fs/adfs/Kconfig"
320 source "fs/affs/Kconfig"
321 source "fs/ecryptfs/Kconfig"
322 source "fs/hfs/Kconfig"
323 source "fs/hfsplus/Kconfig"
324 source "fs/befs/Kconfig"
325 source "fs/bfs/Kconfig"
326 source "fs/efs/Kconfig"
327 source "fs/jffs2/Kconfig"
328 # UBIFS File system configuration
329 source "fs/ubifs/Kconfig"
330 source "fs/cramfs/Kconfig"
331 source "fs/squashfs/Kconfig"
332 source "fs/freevxfs/Kconfig"
333 source "fs/minix/Kconfig"
334 source "fs/omfs/Kconfig"
335 source "fs/hpfs/Kconfig"
336 source "fs/qnx4/Kconfig"
337 source "fs/qnx6/Kconfig"
338 source "fs/romfs/Kconfig"
339 source "fs/pstore/Kconfig"
340 source "fs/sysv/Kconfig"
341 source "fs/ufs/Kconfig"
342 source "fs/erofs/Kconfig"
343 source "fs/vboxsf/Kconfig"
344 
345 endif # MISC_FILESYSTEMS
346 
347 menuconfig NETWORK_FILESYSTEMS
348 	bool "Network File Systems"
349 	default y
350 	depends on NET
351 	help
352 	  Say Y here to get to see options for network filesystems and
353 	  filesystem-related networking code, such as NFS daemon and
354 	  RPCSEC security modules.
355 
356 	  This option alone does not add any kernel code.
357 
358 	  If you say N, all options in this submenu will be skipped and
359 	  disabled; if unsure, say Y here.
360 
361 if NETWORK_FILESYSTEMS
362 
363 source "fs/nfs/Kconfig"
364 source "fs/nfsd/Kconfig"
365 
366 config GRACE_PERIOD
367 	tristate
368 
369 config LOCKD
370 	tristate
371 	depends on FILE_LOCKING
372 	select GRACE_PERIOD
373 
374 config LOCKD_V4
375 	bool
376 	depends on NFSD || NFS_V3
377 	depends on FILE_LOCKING
378 	default y
379 
380 config NFS_ACL_SUPPORT
381 	tristate
382 	select FS_POSIX_ACL
383 
384 config NFS_COMMON
385 	bool
386 	depends on NFSD || NFS_FS || LOCKD
387 	default y
388 
389 config NFS_COMMON_LOCALIO_SUPPORT
390 	tristate
391 	depends on NFS_LOCALIO
392 	default y if NFSD=y || NFS_FS=y
393 	default m if NFSD=m && NFS_FS=m
394 	select SUNRPC
395 
396 config NFS_LOCALIO
397 	bool "NFS client and server support for LOCALIO auxiliary protocol"
398 	depends on NFSD && NFS_FS
399 	select NFS_COMMON_LOCALIO_SUPPORT
400 	default n
401 	help
402 	  Some NFS servers support an auxiliary NFS LOCALIO protocol
403 	  that is not an official part of the NFS protocol.
404 
405 	  This option enables support for the LOCALIO protocol in the
406 	  kernel's NFS server and client. Enable this to permit local
407 	  NFS clients to bypass the network when issuing reads and
408 	  writes to the local NFS server.
409 
410 	  If unsure, say N.
411 
412 config NFS_V4_2_SSC_HELPER
413 	bool
414 	default y if NFS_V4_2
415 
416 source "net/sunrpc/Kconfig"
417 source "fs/ceph/Kconfig"
418 
419 source "fs/smb/Kconfig"
420 source "fs/coda/Kconfig"
421 source "fs/afs/Kconfig"
422 source "fs/9p/Kconfig"
423 
424 endif # NETWORK_FILESYSTEMS
425 
426 source "fs/nls/Kconfig"
427 source "fs/dlm/Kconfig"
428 source "fs/unicode/Kconfig"
429 
430 config IO_WQ
431 	bool
432 
433 endmenu
434