1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # 2 #
3 # File system configuration 3 # File system configuration
4 # 4 #
5 5
6 menu "File systems" 6 menu "File systems"
7 7
8 # Use unaligned word dcache accesses 8 # Use unaligned word dcache accesses
9 config DCACHE_WORD_ACCESS 9 config DCACHE_WORD_ACCESS
10 bool 10 bool
11 11
12 config VALIDATE_FS_PARSER 12 config VALIDATE_FS_PARSER
13 bool "Validate filesystem parameter de 13 bool "Validate filesystem parameter description"
14 help 14 help
15 Enable this to perform validation of 15 Enable this to perform validation of the parameter description for a
16 filesystem when it is registered. 16 filesystem when it is registered.
17 17
18 config FS_IOMAP 18 config FS_IOMAP
19 bool 19 bool
20 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 21 # old blockdev_direct_IO implementation. Use iomap for new code instead
29 config LEGACY_DIRECT_IO 22 config LEGACY_DIRECT_IO
30 depends on BUFFER_HEAD <<
31 bool 23 bool
32 24
33 if BLOCK 25 if BLOCK
34 26
35 source "fs/ext2/Kconfig" 27 source "fs/ext2/Kconfig"
36 source "fs/ext4/Kconfig" 28 source "fs/ext4/Kconfig"
37 source "fs/jbd2/Kconfig" 29 source "fs/jbd2/Kconfig"
38 30
39 config FS_MBCACHE 31 config FS_MBCACHE
40 # Meta block cache for Extended Attributes (ex 32 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
41 tristate 33 tristate
42 default y if EXT2_FS=y && EXT2_FS_XATT 34 default y if EXT2_FS=y && EXT2_FS_XATTR
43 default y if EXT4_FS=y 35 default y if EXT4_FS=y
44 default m if EXT2_FS_XATTR || EXT4_FS 36 default m if EXT2_FS_XATTR || EXT4_FS
45 37
46 source "fs/reiserfs/Kconfig" 38 source "fs/reiserfs/Kconfig"
47 source "fs/jfs/Kconfig" 39 source "fs/jfs/Kconfig"
48 40
49 source "fs/xfs/Kconfig" 41 source "fs/xfs/Kconfig"
50 source "fs/gfs2/Kconfig" 42 source "fs/gfs2/Kconfig"
51 source "fs/ocfs2/Kconfig" 43 source "fs/ocfs2/Kconfig"
52 source "fs/btrfs/Kconfig" 44 source "fs/btrfs/Kconfig"
53 source "fs/nilfs2/Kconfig" 45 source "fs/nilfs2/Kconfig"
54 source "fs/f2fs/Kconfig" 46 source "fs/f2fs/Kconfig"
55 source "fs/bcachefs/Kconfig" <<
56 source "fs/zonefs/Kconfig" 47 source "fs/zonefs/Kconfig"
57 48
58 endif # BLOCK 49 endif # BLOCK
59 50
60 config FS_DAX 51 config FS_DAX
61 bool "File system based Direct Access 52 bool "File system based Direct Access (DAX) support"
62 depends on MMU 53 depends on MMU
>> 54 depends on !(ARM || MIPS || SPARC)
63 depends on ZONE_DEVICE || FS_DAX_LIMIT 55 depends on ZONE_DEVICE || FS_DAX_LIMITED
64 select FS_IOMAP 56 select FS_IOMAP
65 select DAX 57 select DAX
66 help 58 help
67 Direct Access (DAX) can be used on m 59 Direct Access (DAX) can be used on memory-backed block devices.
68 If the block device supports DAX and 60 If the block device supports DAX and the filesystem supports DAX,
69 then you can avoid using the pagecac 61 then you can avoid using the pagecache to buffer I/Os. Turning
70 on this option will compile in suppo 62 on this option will compile in support for DAX.
71 63
72 For a DAX device to support file sys 64 For a DAX device to support file system access it needs to have
73 struct pages. For the nfit based NV 65 struct pages. For the nfit based NVDIMMs this can be enabled
74 using the ndctl utility: 66 using the ndctl utility:
75 67
76 # ndctl create-namespace --for 68 # ndctl create-namespace --force --reconfig=namespace0.0 \
77 --mode=fsdax --map=mem 69 --mode=fsdax --map=mem
78 70
79 See the 'create-namespace' man page 71 See the 'create-namespace' man page for details on the overhead of
80 --map=mem: 72 --map=mem:
81 https://docs.pmem.io/ndctl-user-guid 73 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
82 74
83 For ndctl to work CONFIG_DEV_DAX nee 75 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
84 file systems DAX support needs to be 76 file systems DAX support needs to be manually enabled globally or
85 per-inode using a mount option as we 77 per-inode using a mount option as well. See the file documentation in
86 Documentation/filesystems/dax.rst fo 78 Documentation/filesystems/dax.rst for details.
87 79
88 If you do not have a block device th 80 If you do not have a block device that is capable of using this,
89 or if unsure, say N. Saying Y will 81 or if unsure, say N. Saying Y will increase the size of the kernel
90 by about 5kB. 82 by about 5kB.
91 83
92 config FS_DAX_PMD 84 config FS_DAX_PMD
93 bool 85 bool
94 default FS_DAX 86 default FS_DAX
95 depends on FS_DAX 87 depends on FS_DAX
96 depends on ZONE_DEVICE 88 depends on ZONE_DEVICE
97 depends on TRANSPARENT_HUGEPAGE 89 depends on TRANSPARENT_HUGEPAGE
98 90
99 # Selected by DAX drivers that do not expect f 91 # Selected by DAX drivers that do not expect filesystem DAX to support
100 # get_user_pages() of DAX mappings. I.e. "limi 92 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
101 # for fork() of processes with MAP_SHARED mapp 93 # for fork() of processes with MAP_SHARED mappings or support for
102 # direct-I/O to a DAX mapping. 94 # direct-I/O to a DAX mapping.
103 config FS_DAX_LIMITED 95 config FS_DAX_LIMITED
104 bool 96 bool
105 97
106 # Posix ACL utility routines 98 # Posix ACL utility routines
107 # 99 #
108 # Note: Posix ACLs can be implemented without 100 # Note: Posix ACLs can be implemented without these helpers. Never use
109 # this symbol for ifdefs in core code. 101 # this symbol for ifdefs in core code.
110 # 102 #
111 config FS_POSIX_ACL 103 config FS_POSIX_ACL
112 def_bool n 104 def_bool n
113 105
114 config EXPORTFS 106 config EXPORTFS
115 tristate 107 tristate
116 108
117 config EXPORTFS_BLOCK_OPS 109 config EXPORTFS_BLOCK_OPS
118 bool "Enable filesystem export operati 110 bool "Enable filesystem export operations for block IO"
119 help 111 help
120 This option enables the export opera 112 This option enables the export operations for a filesystem to support
121 external block IO. 113 external block IO.
122 114
123 config FILE_LOCKING 115 config FILE_LOCKING
124 bool "Enable POSIX file locking API" i 116 bool "Enable POSIX file locking API" if EXPERT
125 default y 117 default y
126 help 118 help
127 This option enables standard file lo 119 This option enables standard file locking support, required
128 for filesystems like NFS and for the 120 for filesystems like NFS and for the flock() system
129 call. Disabling this option saves ab 121 call. Disabling this option saves about 11k.
130 122
131 source "fs/crypto/Kconfig" 123 source "fs/crypto/Kconfig"
132 124
133 source "fs/verity/Kconfig" 125 source "fs/verity/Kconfig"
134 126
135 source "fs/notify/Kconfig" 127 source "fs/notify/Kconfig"
136 128
137 source "fs/quota/Kconfig" 129 source "fs/quota/Kconfig"
138 130
139 source "fs/autofs/Kconfig" 131 source "fs/autofs/Kconfig"
140 source "fs/fuse/Kconfig" 132 source "fs/fuse/Kconfig"
141 source "fs/overlayfs/Kconfig" 133 source "fs/overlayfs/Kconfig"
142 134
143 menu "Caches" 135 menu "Caches"
144 136
145 source "fs/netfs/Kconfig" 137 source "fs/netfs/Kconfig"
>> 138 source "fs/fscache/Kconfig"
146 source "fs/cachefiles/Kconfig" 139 source "fs/cachefiles/Kconfig"
147 140
148 endmenu 141 endmenu
149 142
150 if BLOCK 143 if BLOCK
151 menu "CD-ROM/DVD Filesystems" 144 menu "CD-ROM/DVD Filesystems"
152 145
153 source "fs/isofs/Kconfig" 146 source "fs/isofs/Kconfig"
154 source "fs/udf/Kconfig" 147 source "fs/udf/Kconfig"
155 148
156 endmenu 149 endmenu
157 endif # BLOCK 150 endif # BLOCK
158 151
159 if BLOCK 152 if BLOCK
160 menu "DOS/FAT/EXFAT/NT Filesystems" 153 menu "DOS/FAT/EXFAT/NT Filesystems"
161 154
162 source "fs/fat/Kconfig" 155 source "fs/fat/Kconfig"
163 source "fs/exfat/Kconfig" 156 source "fs/exfat/Kconfig"
>> 157 source "fs/ntfs/Kconfig"
164 source "fs/ntfs3/Kconfig" 158 source "fs/ntfs3/Kconfig"
165 159
166 endmenu 160 endmenu
167 endif # BLOCK 161 endif # BLOCK
168 162
169 menu "Pseudo filesystems" 163 menu "Pseudo filesystems"
170 164
171 source "fs/proc/Kconfig" 165 source "fs/proc/Kconfig"
172 source "fs/kernfs/Kconfig" 166 source "fs/kernfs/Kconfig"
173 source "fs/sysfs/Kconfig" 167 source "fs/sysfs/Kconfig"
174 168
175 config TMPFS 169 config TMPFS
176 bool "Tmpfs virtual memory file system 170 bool "Tmpfs virtual memory file system support (former shm fs)"
177 depends on SHMEM 171 depends on SHMEM
178 select MEMFD_CREATE <<
179 help 172 help
180 Tmpfs is a file system which keeps a 173 Tmpfs is a file system which keeps all files in virtual memory.
181 174
182 Everything in tmpfs is temporary in 175 Everything in tmpfs is temporary in the sense that no files will be
183 created on your hard drive. The file 176 created on your hard drive. The files live in memory and swap
184 space. If you unmount a tmpfs instan 177 space. If you unmount a tmpfs instance, everything stored therein is
185 lost. 178 lost.
186 179
187 See <file:Documentation/filesystems/ 180 See <file:Documentation/filesystems/tmpfs.rst> for details.
188 181
189 config TMPFS_POSIX_ACL 182 config TMPFS_POSIX_ACL
190 bool "Tmpfs POSIX Access Control Lists 183 bool "Tmpfs POSIX Access Control Lists"
191 depends on TMPFS 184 depends on TMPFS
192 select TMPFS_XATTR 185 select TMPFS_XATTR
193 select FS_POSIX_ACL 186 select FS_POSIX_ACL
194 help 187 help
195 POSIX Access Control Lists (ACLs) su 188 POSIX Access Control Lists (ACLs) support additional access rights
196 for users and groups beyond the stan 189 for users and groups beyond the standard owner/group/world scheme,
197 and this option selects support for 190 and this option selects support for ACLs specifically for tmpfs
198 filesystems. 191 filesystems.
199 192
200 If you've selected TMPFS, it's possi 193 If you've selected TMPFS, it's possible that you'll also need
201 this option as there are a number of 194 this option as there are a number of Linux distros that require
202 POSIX ACL support under /dev for cer 195 POSIX ACL support under /dev for certain features to work properly.
203 For example, some distros need this 196 For example, some distros need this feature for ALSA-related /dev
204 files for sound to work properly. I 197 files for sound to work properly. In short, if you're not sure,
205 say Y. 198 say Y.
206 199
207 config TMPFS_XATTR 200 config TMPFS_XATTR
208 bool "Tmpfs extended attributes" 201 bool "Tmpfs extended attributes"
209 depends on TMPFS 202 depends on TMPFS
210 default n 203 default n
211 help 204 help
212 Extended attributes are name:value p 205 Extended attributes are name:value pairs associated with inodes by
213 the kernel or by users (see the attr 206 the kernel or by users (see the attr(5) manual page for details).
214 207
215 This enables support for the trusted !! 208 Currently this enables support for the trusted.* and
216 namespaces. !! 209 security.* namespaces.
217 210
218 You need this for POSIX ACL support 211 You need this for POSIX ACL support on tmpfs.
219 212
220 If unsure, say N. 213 If unsure, say N.
221 214
222 config TMPFS_INODE64 215 config TMPFS_INODE64
223 bool "Use 64-bit ino_t by default in t 216 bool "Use 64-bit ino_t by default in tmpfs"
224 depends on TMPFS && 64BIT 217 depends on TMPFS && 64BIT
225 default n 218 default n
226 help 219 help
227 tmpfs has historically used only ino 220 tmpfs has historically used only inode numbers as wide as an unsigned
228 int. In some cases this can cause wr 221 int. In some cases this can cause wraparound, potentially resulting
229 in multiple files with the same inod 222 in multiple files with the same inode number on a single device. This
230 option makes tmpfs use the full widt 223 option makes tmpfs use the full width of ino_t by default, without
231 needing to specify the inode64 optio 224 needing to specify the inode64 option when mounting.
232 225
233 But if a long-lived tmpfs is to be a 226 But if a long-lived tmpfs is to be accessed by 32-bit applications so
234 ancient that opening a file larger t 227 ancient that opening a file larger than 2GiB fails with EINVAL, then
235 the INODE64 config option and inode6 228 the INODE64 config option and inode64 mount option risk operations
236 failing with EOVERFLOW once 33-bit i 229 failing with EOVERFLOW once 33-bit inode numbers are reached.
237 230
238 To override this configured default, 231 To override this configured default, use the inode32 or inode64
239 option when mounting. 232 option when mounting.
240 233
241 If unsure, say N. 234 If unsure, say N.
242 235
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 <<
249 usage. Say Y to enable quota suppor <<
250 user and group quota enforcement wit <<
251 mount options. <<
252 <<
253 If unsure, say N. <<
254 <<
255 config ARCH_SUPPORTS_HUGETLBFS 236 config ARCH_SUPPORTS_HUGETLBFS
256 def_bool n 237 def_bool n
257 238
258 menuconfig HUGETLBFS !! 239 config HUGETLBFS
259 bool "HugeTLB file system support" 240 bool "HugeTLB file system support"
260 depends on X86 || SPARC64 || ARCH_SUPP !! 241 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
261 depends on (SYSFS || SYSCTL) 242 depends on (SYSFS || SYSCTL)
262 select MEMFD_CREATE <<
263 select PADATA if SMP <<
264 help 243 help
265 hugetlbfs is a filesystem backing fo 244 hugetlbfs is a filesystem backing for HugeTLB pages, based on
266 ramfs. For architectures that suppor 245 ramfs. For architectures that support it, say Y here and read
267 <file:Documentation/admin-guide/mm/h 246 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
268 247
269 If unsure, say N. 248 If unsure, say N.
270 249
271 if HUGETLBFS !! 250 config HUGETLB_PAGE
>> 251 def_bool HUGETLBFS
>> 252
>> 253 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
>> 254 def_bool HUGETLB_PAGE
>> 255 depends on ARCH_WANT_OPTIMIZE_VMEMMAP
>> 256 depends on SPARSEMEM_VMEMMAP
>> 257
272 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_O 258 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
273 bool "HugeTLB Vmemmap Optimization (HV 259 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
274 default n 260 default n
275 depends on HUGETLB_PAGE_OPTIMIZE_VMEMM 261 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
276 help 262 help
277 The HugeTLB Vmemmap Optimization (HV !! 263 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to
278 enable HVO by default. It can be dis 264 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
279 (boot command line) or hugetlb_optim 265 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
280 endif # HUGETLBFS <<
281 266
282 config HUGETLB_PAGE !! 267 config MEMFD_CREATE
283 def_bool HUGETLBFS !! 268 def_bool TMPFS || HUGETLBFS
284 select XARRAY_MULTI <<
285 <<
286 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP <<
287 def_bool HUGETLB_PAGE <<
288 depends on ARCH_WANT_OPTIMIZE_HUGETLB_ <<
289 depends on SPARSEMEM_VMEMMAP <<
290 269
291 config ARCH_HAS_GIGANTIC_PAGE 270 config ARCH_HAS_GIGANTIC_PAGE
292 bool 271 bool
293 272
294 source "fs/configfs/Kconfig" 273 source "fs/configfs/Kconfig"
295 source "fs/efivarfs/Kconfig" 274 source "fs/efivarfs/Kconfig"
296 275
297 endmenu 276 endmenu
298 277
299 menuconfig MISC_FILESYSTEMS 278 menuconfig MISC_FILESYSTEMS
300 bool "Miscellaneous filesystems" 279 bool "Miscellaneous filesystems"
301 default y 280 default y
302 help 281 help
303 Say Y here to get to see options for 282 Say Y here to get to see options for various miscellaneous
304 filesystems, such as filesystems tha 283 filesystems, such as filesystems that came from other
305 operating systems. 284 operating systems.
306 285
307 This option alone does not add any k 286 This option alone does not add any kernel code.
308 287
309 If you say N, all options in this su 288 If you say N, all options in this submenu will be skipped and
310 disabled; if unsure, say Y here. 289 disabled; if unsure, say Y here.
311 290
312 if MISC_FILESYSTEMS 291 if MISC_FILESYSTEMS
313 292
314 source "fs/orangefs/Kconfig" 293 source "fs/orangefs/Kconfig"
315 source "fs/adfs/Kconfig" 294 source "fs/adfs/Kconfig"
316 source "fs/affs/Kconfig" 295 source "fs/affs/Kconfig"
317 source "fs/ecryptfs/Kconfig" 296 source "fs/ecryptfs/Kconfig"
318 source "fs/hfs/Kconfig" 297 source "fs/hfs/Kconfig"
319 source "fs/hfsplus/Kconfig" 298 source "fs/hfsplus/Kconfig"
320 source "fs/befs/Kconfig" 299 source "fs/befs/Kconfig"
321 source "fs/bfs/Kconfig" 300 source "fs/bfs/Kconfig"
322 source "fs/efs/Kconfig" 301 source "fs/efs/Kconfig"
323 source "fs/jffs2/Kconfig" 302 source "fs/jffs2/Kconfig"
324 # UBIFS File system configuration 303 # UBIFS File system configuration
325 source "fs/ubifs/Kconfig" 304 source "fs/ubifs/Kconfig"
326 source "fs/cramfs/Kconfig" 305 source "fs/cramfs/Kconfig"
327 source "fs/squashfs/Kconfig" 306 source "fs/squashfs/Kconfig"
328 source "fs/freevxfs/Kconfig" 307 source "fs/freevxfs/Kconfig"
329 source "fs/minix/Kconfig" 308 source "fs/minix/Kconfig"
330 source "fs/omfs/Kconfig" 309 source "fs/omfs/Kconfig"
331 source "fs/hpfs/Kconfig" 310 source "fs/hpfs/Kconfig"
332 source "fs/qnx4/Kconfig" 311 source "fs/qnx4/Kconfig"
333 source "fs/qnx6/Kconfig" 312 source "fs/qnx6/Kconfig"
334 source "fs/romfs/Kconfig" 313 source "fs/romfs/Kconfig"
335 source "fs/pstore/Kconfig" 314 source "fs/pstore/Kconfig"
336 source "fs/sysv/Kconfig" 315 source "fs/sysv/Kconfig"
337 source "fs/ufs/Kconfig" 316 source "fs/ufs/Kconfig"
338 source "fs/erofs/Kconfig" 317 source "fs/erofs/Kconfig"
339 source "fs/vboxsf/Kconfig" 318 source "fs/vboxsf/Kconfig"
340 319
341 endif # MISC_FILESYSTEMS 320 endif # MISC_FILESYSTEMS
342 321
343 menuconfig NETWORK_FILESYSTEMS 322 menuconfig NETWORK_FILESYSTEMS
344 bool "Network File Systems" 323 bool "Network File Systems"
345 default y 324 default y
346 depends on NET 325 depends on NET
347 help 326 help
348 Say Y here to get to see options for 327 Say Y here to get to see options for network filesystems and
349 filesystem-related networking code, 328 filesystem-related networking code, such as NFS daemon and
350 RPCSEC security modules. 329 RPCSEC security modules.
351 330
352 This option alone does not add any k 331 This option alone does not add any kernel code.
353 332
354 If you say N, all options in this su 333 If you say N, all options in this submenu will be skipped and
355 disabled; if unsure, say Y here. 334 disabled; if unsure, say Y here.
356 335
357 if NETWORK_FILESYSTEMS 336 if NETWORK_FILESYSTEMS
358 337
359 source "fs/nfs/Kconfig" 338 source "fs/nfs/Kconfig"
360 source "fs/nfsd/Kconfig" 339 source "fs/nfsd/Kconfig"
361 340
362 config GRACE_PERIOD 341 config GRACE_PERIOD
363 tristate 342 tristate
364 343
365 config LOCKD 344 config LOCKD
366 tristate 345 tristate
367 depends on FILE_LOCKING 346 depends on FILE_LOCKING
368 select GRACE_PERIOD 347 select GRACE_PERIOD
369 348
370 config LOCKD_V4 349 config LOCKD_V4
371 bool 350 bool
372 depends on NFSD || NFS_V3 351 depends on NFSD || NFS_V3
373 depends on FILE_LOCKING 352 depends on FILE_LOCKING
374 default y 353 default y
375 354
376 config NFS_ACL_SUPPORT 355 config NFS_ACL_SUPPORT
377 tristate 356 tristate
378 select FS_POSIX_ACL 357 select FS_POSIX_ACL
379 358
380 config NFS_COMMON 359 config NFS_COMMON
381 bool 360 bool
382 depends on NFSD || NFS_FS || LOCKD 361 depends on NFSD || NFS_FS || LOCKD
383 default y 362 default y
384 363
385 config NFS_V4_2_SSC_HELPER 364 config NFS_V4_2_SSC_HELPER
386 bool 365 bool
387 default y if NFS_V4_2 366 default y if NFS_V4_2
388 367
389 source "net/sunrpc/Kconfig" 368 source "net/sunrpc/Kconfig"
390 source "fs/ceph/Kconfig" 369 source "fs/ceph/Kconfig"
391 370
392 source "fs/smb/Kconfig" 371 source "fs/smb/Kconfig"
393 source "fs/coda/Kconfig" 372 source "fs/coda/Kconfig"
394 source "fs/afs/Kconfig" 373 source "fs/afs/Kconfig"
395 source "fs/9p/Kconfig" 374 source "fs/9p/Kconfig"
396 375
397 endif # NETWORK_FILESYSTEMS 376 endif # NETWORK_FILESYSTEMS
398 377
399 source "fs/nls/Kconfig" 378 source "fs/nls/Kconfig"
400 source "fs/dlm/Kconfig" 379 source "fs/dlm/Kconfig"
401 source "fs/unicode/Kconfig" 380 source "fs/unicode/Kconfig"
402 381
403 config IO_WQ 382 config IO_WQ
404 bool 383 bool
405 384
406 endmenu 385 endmenu
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