tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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
21if BLOCK
22
23source "fs/ext2/Kconfig"
24source "fs/ext4/Kconfig"
25source "fs/jbd2/Kconfig"
26
27config FS_MBCACHE
28# Meta block cache for Extended Attributes (ext2/ext3/ext4)
29 tristate
30 default y if EXT2_FS=y && EXT2_FS_XATTR
31 default y if EXT4_FS=y
32 default m if EXT2_FS_XATTR || EXT4_FS
33
34source "fs/reiserfs/Kconfig"
35source "fs/jfs/Kconfig"
36
37source "fs/xfs/Kconfig"
38source "fs/gfs2/Kconfig"
39source "fs/ocfs2/Kconfig"
40source "fs/btrfs/Kconfig"
41source "fs/nilfs2/Kconfig"
42source "fs/f2fs/Kconfig"
43source "fs/zonefs/Kconfig"
44
45endif # BLOCK
46
47config FS_DAX
48 bool "File system based Direct Access (DAX) support"
49 depends on MMU
50 depends on !(ARM || MIPS || SPARC)
51 depends on ZONE_DEVICE || FS_DAX_LIMITED
52 select FS_IOMAP
53 select DAX
54 help
55 Direct Access (DAX) can be used on memory-backed block devices.
56 If the block device supports DAX and the filesystem supports DAX,
57 then you can avoid using the pagecache to buffer I/Os. Turning
58 on this option will compile in support for DAX.
59
60 For a DAX device to support file system access it needs to have
61 struct pages. For the nfit based NVDIMMs this can be enabled
62 using the ndctl utility:
63
64 # ndctl create-namespace --force --reconfig=namespace0.0 \
65 --mode=fsdax --map=mem
66
67 See the 'create-namespace' man page for details on the overhead of
68 --map=mem:
69 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
70
71 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
72 file systems DAX support needs to be manually enabled globally or
73 per-inode using a mount option as well. See the file documentation in
74 Documentation/filesystems/dax.rst for details.
75
76 If you do not have a block device that is capable of using this,
77 or if unsure, say N. Saying Y will increase the size of the kernel
78 by about 5kB.
79
80config FS_DAX_PMD
81 bool
82 default FS_DAX
83 depends on FS_DAX
84 depends on ZONE_DEVICE
85 depends on TRANSPARENT_HUGEPAGE
86
87# Selected by DAX drivers that do not expect filesystem DAX to support
88# get_user_pages() of DAX mappings. I.e. "limited" indicates no support
89# for fork() of processes with MAP_SHARED mappings or support for
90# direct-I/O to a DAX mapping.
91config FS_DAX_LIMITED
92 bool
93
94# Posix ACL utility routines
95#
96# Note: Posix ACLs can be implemented without these helpers. Never use
97# this symbol for ifdefs in core code.
98#
99config FS_POSIX_ACL
100 def_bool n
101
102config EXPORTFS
103 tristate
104
105config EXPORTFS_BLOCK_OPS
106 bool "Enable filesystem export operations for block IO"
107 help
108 This option enables the export operations for a filesystem to support
109 external block IO.
110
111config FILE_LOCKING
112 bool "Enable POSIX file locking API" if EXPERT
113 default y
114 help
115 This option enables standard file locking support, required
116 for filesystems like NFS and for the flock() system
117 call. Disabling this option saves about 11k.
118
119source "fs/crypto/Kconfig"
120
121source "fs/verity/Kconfig"
122
123source "fs/notify/Kconfig"
124
125source "fs/quota/Kconfig"
126
127source "fs/autofs/Kconfig"
128source "fs/fuse/Kconfig"
129source "fs/overlayfs/Kconfig"
130
131menu "Caches"
132
133source "fs/netfs/Kconfig"
134source "fs/fscache/Kconfig"
135source "fs/cachefiles/Kconfig"
136
137endmenu
138
139if BLOCK
140menu "CD-ROM/DVD Filesystems"
141
142source "fs/isofs/Kconfig"
143source "fs/udf/Kconfig"
144
145endmenu
146endif # BLOCK
147
148if BLOCK
149menu "DOS/FAT/EXFAT/NT Filesystems"
150
151source "fs/fat/Kconfig"
152source "fs/exfat/Kconfig"
153source "fs/ntfs/Kconfig"
154source "fs/ntfs3/Kconfig"
155
156endmenu
157endif # BLOCK
158
159menu "Pseudo filesystems"
160
161source "fs/proc/Kconfig"
162source "fs/kernfs/Kconfig"
163source "fs/sysfs/Kconfig"
164
165config TMPFS
166 bool "Tmpfs virtual memory file system support (former shm fs)"
167 depends on SHMEM
168 help
169 Tmpfs is a file system which keeps all files in virtual memory.
170
171 Everything in tmpfs is temporary in the sense that no files will be
172 created on your hard drive. The files live in memory and swap
173 space. If you unmount a tmpfs instance, everything stored therein is
174 lost.
175
176 See <file:Documentation/filesystems/tmpfs.rst> for details.
177
178config TMPFS_POSIX_ACL
179 bool "Tmpfs POSIX Access Control Lists"
180 depends on TMPFS
181 select TMPFS_XATTR
182 select FS_POSIX_ACL
183 help
184 POSIX Access Control Lists (ACLs) support additional access rights
185 for users and groups beyond the standard owner/group/world scheme,
186 and this option selects support for ACLs specifically for tmpfs
187 filesystems.
188
189 If you've selected TMPFS, it's possible that you'll also need
190 this option as there are a number of Linux distros that require
191 POSIX ACL support under /dev for certain features to work properly.
192 For example, some distros need this feature for ALSA-related /dev
193 files for sound to work properly. In short, if you're not sure,
194 say Y.
195
196config TMPFS_XATTR
197 bool "Tmpfs extended attributes"
198 depends on TMPFS
199 default n
200 help
201 Extended attributes are name:value pairs associated with inodes by
202 the kernel or by users (see the attr(5) manual page for details).
203
204 Currently this enables support for the trusted.* and
205 security.* namespaces.
206
207 You need this for POSIX ACL support on tmpfs.
208
209 If unsure, say N.
210
211config TMPFS_INODE64
212 bool "Use 64-bit ino_t by default in tmpfs"
213 depends on TMPFS && 64BIT
214 default n
215 help
216 tmpfs has historically used only inode numbers as wide as an unsigned
217 int. In some cases this can cause wraparound, potentially resulting
218 in multiple files with the same inode number on a single device. This
219 option makes tmpfs use the full width of ino_t by default, without
220 needing to specify the inode64 option when mounting.
221
222 But if a long-lived tmpfs is to be accessed by 32-bit applications so
223 ancient that opening a file larger than 2GiB fails with EINVAL, then
224 the INODE64 config option and inode64 mount option risk operations
225 failing with EOVERFLOW once 33-bit inode numbers are reached.
226
227 To override this configured default, use the inode32 or inode64
228 option when mounting.
229
230 If unsure, say N.
231
232config ARCH_SUPPORTS_HUGETLBFS
233 def_bool n
234
235config HUGETLBFS
236 bool "HugeTLB file system support"
237 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
238 help
239 hugetlbfs is a filesystem backing for HugeTLB pages, based on
240 ramfs. For architectures that support it, say Y here and read
241 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
242
243 If unsure, say N.
244
245config HUGETLB_PAGE
246 def_bool HUGETLBFS
247
248#
249# Select this config option from the architecture Kconfig, if it is preferred
250# to enable the feature of HugeTLB Vmemmap Optimization (HVO).
251#
252config ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
253 bool
254
255config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
256 def_bool HUGETLB_PAGE
257 depends on ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
258 depends on SPARSEMEM_VMEMMAP
259
260config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
261 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
262 default n
263 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
264 help
265 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to
266 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
267 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
268
269config MEMFD_CREATE
270 def_bool TMPFS || HUGETLBFS
271
272config ARCH_HAS_GIGANTIC_PAGE
273 bool
274
275source "fs/configfs/Kconfig"
276source "fs/efivarfs/Kconfig"
277
278endmenu
279
280menuconfig MISC_FILESYSTEMS
281 bool "Miscellaneous filesystems"
282 default y
283 help
284 Say Y here to get to see options for various miscellaneous
285 filesystems, such as filesystems that came from other
286 operating systems.
287
288 This option alone does not add any kernel code.
289
290 If you say N, all options in this submenu will be skipped and
291 disabled; if unsure, say Y here.
292
293if MISC_FILESYSTEMS
294
295source "fs/orangefs/Kconfig"
296source "fs/adfs/Kconfig"
297source "fs/affs/Kconfig"
298source "fs/ecryptfs/Kconfig"
299source "fs/hfs/Kconfig"
300source "fs/hfsplus/Kconfig"
301source "fs/befs/Kconfig"
302source "fs/bfs/Kconfig"
303source "fs/efs/Kconfig"
304source "fs/jffs2/Kconfig"
305# UBIFS File system configuration
306source "fs/ubifs/Kconfig"
307source "fs/cramfs/Kconfig"
308source "fs/squashfs/Kconfig"
309source "fs/freevxfs/Kconfig"
310source "fs/minix/Kconfig"
311source "fs/omfs/Kconfig"
312source "fs/hpfs/Kconfig"
313source "fs/qnx4/Kconfig"
314source "fs/qnx6/Kconfig"
315source "fs/romfs/Kconfig"
316source "fs/pstore/Kconfig"
317source "fs/sysv/Kconfig"
318source "fs/ufs/Kconfig"
319source "fs/erofs/Kconfig"
320source "fs/vboxsf/Kconfig"
321
322endif # MISC_FILESYSTEMS
323
324menuconfig NETWORK_FILESYSTEMS
325 bool "Network File Systems"
326 default y
327 depends on NET
328 help
329 Say Y here to get to see options for network filesystems and
330 filesystem-related networking code, such as NFS daemon and
331 RPCSEC security modules.
332
333 This option alone does not add any kernel code.
334
335 If you say N, all options in this submenu will be skipped and
336 disabled; if unsure, say Y here.
337
338if NETWORK_FILESYSTEMS
339
340source "fs/nfs/Kconfig"
341source "fs/nfsd/Kconfig"
342
343config GRACE_PERIOD
344 tristate
345
346config LOCKD
347 tristate
348 depends on FILE_LOCKING
349 select GRACE_PERIOD
350
351config LOCKD_V4
352 bool
353 depends on NFSD || NFS_V3
354 depends on FILE_LOCKING
355 default y
356
357config NFS_ACL_SUPPORT
358 tristate
359 select FS_POSIX_ACL
360
361config NFS_COMMON
362 bool
363 depends on NFSD || NFS_FS || LOCKD
364 default y
365
366config NFS_V4_2_SSC_HELPER
367 bool
368 default y if NFS_V4_2
369
370source "net/sunrpc/Kconfig"
371source "fs/ceph/Kconfig"
372
373source "fs/cifs/Kconfig"
374source "fs/ksmbd/Kconfig"
375
376config SMBFS_COMMON
377 tristate
378 default y if CIFS=y || SMB_SERVER=y
379 default m if CIFS=m || SMB_SERVER=m
380
381source "fs/coda/Kconfig"
382source "fs/afs/Kconfig"
383source "fs/9p/Kconfig"
384
385endif # NETWORK_FILESYSTEMS
386
387source "fs/nls/Kconfig"
388source "fs/dlm/Kconfig"
389source "fs/unicode/Kconfig"
390
391config IO_WQ
392 bool
393
394endmenu