Linux kernel mirror (for testing)
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linux
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/reiserfs/Kconfig"
47source "fs/jfs/Kconfig"
48
49source "fs/xfs/Kconfig"
50source "fs/gfs2/Kconfig"
51source "fs/ocfs2/Kconfig"
52source "fs/btrfs/Kconfig"
53source "fs/nilfs2/Kconfig"
54source "fs/f2fs/Kconfig"
55source "fs/bcachefs/Kconfig"
56source "fs/zonefs/Kconfig"
57
58endif # BLOCK
59
60config 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
92config 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.
103config 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#
111config FS_POSIX_ACL
112 def_bool n
113
114config EXPORTFS
115 tristate
116
117config 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
123config 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
131source "fs/crypto/Kconfig"
132
133source "fs/verity/Kconfig"
134
135source "fs/notify/Kconfig"
136
137source "fs/quota/Kconfig"
138
139source "fs/autofs/Kconfig"
140source "fs/fuse/Kconfig"
141source "fs/overlayfs/Kconfig"
142
143menu "Caches"
144
145source "fs/netfs/Kconfig"
146source "fs/cachefiles/Kconfig"
147
148endmenu
149
150if BLOCK
151menu "CD-ROM/DVD Filesystems"
152
153source "fs/isofs/Kconfig"
154source "fs/udf/Kconfig"
155
156endmenu
157endif # BLOCK
158
159if BLOCK
160menu "DOS/FAT/EXFAT/NT Filesystems"
161
162source "fs/fat/Kconfig"
163source "fs/exfat/Kconfig"
164source "fs/ntfs3/Kconfig"
165
166endmenu
167endif # BLOCK
168
169menu "Pseudo filesystems"
170
171source "fs/proc/Kconfig"
172source "fs/kernfs/Kconfig"
173source "fs/sysfs/Kconfig"
174
175config 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
189config 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
207config 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
222config 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
243config 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
255config ARCH_SUPPORTS_HUGETLBFS
256 def_bool n
257
258menuconfig 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
271if HUGETLBFS
272config 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).
280endif # HUGETLBFS
281
282config HUGETLB_PAGE
283 def_bool HUGETLBFS
284 select XARRAY_MULTI
285
286config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
287 def_bool HUGETLB_PAGE
288 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
289 depends on SPARSEMEM_VMEMMAP
290
291config HUGETLB_PMD_PAGE_TABLE_SHARING
292 def_bool HUGETLB_PAGE
293 depends on ARCH_WANT_HUGE_PMD_SHARE && SPLIT_PMD_PTLOCKS
294
295config ARCH_HAS_GIGANTIC_PAGE
296 bool
297
298source "fs/configfs/Kconfig"
299source "fs/efivarfs/Kconfig"
300
301endmenu
302
303menuconfig 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
316if MISC_FILESYSTEMS
317
318source "fs/orangefs/Kconfig"
319source "fs/adfs/Kconfig"
320source "fs/affs/Kconfig"
321source "fs/ecryptfs/Kconfig"
322source "fs/hfs/Kconfig"
323source "fs/hfsplus/Kconfig"
324source "fs/befs/Kconfig"
325source "fs/bfs/Kconfig"
326source "fs/efs/Kconfig"
327source "fs/jffs2/Kconfig"
328# UBIFS File system configuration
329source "fs/ubifs/Kconfig"
330source "fs/cramfs/Kconfig"
331source "fs/squashfs/Kconfig"
332source "fs/freevxfs/Kconfig"
333source "fs/minix/Kconfig"
334source "fs/omfs/Kconfig"
335source "fs/hpfs/Kconfig"
336source "fs/qnx4/Kconfig"
337source "fs/qnx6/Kconfig"
338source "fs/romfs/Kconfig"
339source "fs/pstore/Kconfig"
340source "fs/sysv/Kconfig"
341source "fs/ufs/Kconfig"
342source "fs/erofs/Kconfig"
343source "fs/vboxsf/Kconfig"
344
345endif # MISC_FILESYSTEMS
346
347menuconfig 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
361if NETWORK_FILESYSTEMS
362
363source "fs/nfs/Kconfig"
364source "fs/nfsd/Kconfig"
365
366config GRACE_PERIOD
367 tristate
368
369config LOCKD
370 tristate
371 depends on FILE_LOCKING
372 select GRACE_PERIOD
373
374config LOCKD_V4
375 bool
376 depends on NFSD || NFS_V3
377 depends on FILE_LOCKING
378 default y
379
380config NFS_ACL_SUPPORT
381 tristate
382 select FS_POSIX_ACL
383
384config NFS_COMMON
385 bool
386 depends on NFSD || NFS_FS || LOCKD
387 default y
388
389config 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
396config 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
412config NFS_V4_2_SSC_HELPER
413 bool
414 default y if NFS_V4_2
415
416source "net/sunrpc/Kconfig"
417source "fs/ceph/Kconfig"
418
419source "fs/smb/Kconfig"
420source "fs/coda/Kconfig"
421source "fs/afs/Kconfig"
422source "fs/9p/Kconfig"
423
424endif # NETWORK_FILESYSTEMS
425
426source "fs/nls/Kconfig"
427source "fs/dlm/Kconfig"
428source "fs/unicode/Kconfig"
429
430config IO_WQ
431 bool
432
433endmenu