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