tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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/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