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/zonefs/Kconfig" 55 56endif # BLOCK 57 58config FS_DAX 59 bool "File system based Direct Access (DAX) support" 60 depends on MMU 61 depends on ZONE_DEVICE 62 select FS_IOMAP 63 select DAX 64 help 65 Direct Access (DAX) can be used on memory-backed block devices. 66 If the block device supports DAX and the filesystem supports DAX, 67 then you can avoid using the pagecache to buffer I/Os. Turning 68 on this option will compile in support for DAX. 69 70 For a DAX device to support file system access it needs to have 71 struct pages. For the nfit based NVDIMMs this can be enabled 72 using the ndctl utility: 73 74 # ndctl create-namespace --force --reconfig=namespace0.0 \ 75 --mode=fsdax --map=mem 76 77 See the 'create-namespace' man page for details on the overhead of 78 --map=mem: 79 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace 80 81 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most 82 file systems DAX support needs to be manually enabled globally or 83 per-inode using a mount option as well. See the file documentation in 84 Documentation/filesystems/dax.rst for details. 85 86 If you do not have a block device that is capable of using this, 87 or if unsure, say N. Saying Y will increase the size of the kernel 88 by about 5kB. 89 90config FS_DAX_PMD 91 bool 92 default FS_DAX 93 depends on FS_DAX 94 depends on ZONE_DEVICE 95 depends on TRANSPARENT_HUGEPAGE 96 97# Posix ACL utility routines 98# 99# Note: Posix ACLs can be implemented without these helpers. Never use 100# this symbol for ifdefs in core code. 101# 102config FS_POSIX_ACL 103 def_bool n 104 105config EXPORTFS 106 tristate 107 108config EXPORTFS_BLOCK_OPS 109 bool "Enable filesystem export operations for block IO" 110 help 111 This option enables the export operations for a filesystem to support 112 external block IO. 113 114config FILE_LOCKING 115 bool "Enable POSIX file locking API" if EXPERT 116 default y 117 help 118 This option enables standard file locking support, required 119 for filesystems like NFS and for the flock() system 120 call. Disabling this option saves about 11k. 121 122source "fs/crypto/Kconfig" 123 124source "fs/verity/Kconfig" 125 126source "fs/notify/Kconfig" 127 128source "fs/quota/Kconfig" 129 130source "fs/autofs/Kconfig" 131source "fs/fuse/Kconfig" 132source "fs/overlayfs/Kconfig" 133 134menu "Caches" 135 136source "fs/netfs/Kconfig" 137source "fs/cachefiles/Kconfig" 138 139endmenu 140 141if BLOCK 142menu "CD-ROM/DVD Filesystems" 143 144source "fs/isofs/Kconfig" 145source "fs/udf/Kconfig" 146 147endmenu 148endif # BLOCK 149 150if BLOCK 151menu "DOS/FAT/EXFAT/NT Filesystems" 152 153source "fs/fat/Kconfig" 154source "fs/exfat/Kconfig" 155source "fs/ntfs3/Kconfig" 156 157endmenu 158endif # BLOCK 159 160menu "Pseudo filesystems" 161 162source "fs/proc/Kconfig" 163source "fs/kernfs/Kconfig" 164source "fs/sysfs/Kconfig" 165 166config TMPFS 167 bool "Tmpfs virtual memory file system support (former shm fs)" 168 depends on SHMEM 169 select MEMFD_CREATE 170 help 171 Tmpfs is a file system which keeps all files in virtual memory. 172 173 Everything in tmpfs is temporary in the sense that no files will be 174 created on your hard drive. The files live in memory and swap 175 space. If you unmount a tmpfs instance, everything stored therein is 176 lost. 177 178 See <file:Documentation/filesystems/tmpfs.rst> for details. 179 180config TMPFS_POSIX_ACL 181 bool "Tmpfs POSIX Access Control Lists" 182 depends on TMPFS 183 select TMPFS_XATTR 184 select FS_POSIX_ACL 185 help 186 POSIX Access Control Lists (ACLs) support additional access rights 187 for users and groups beyond the standard owner/group/world scheme, 188 and this option selects support for ACLs specifically for tmpfs 189 filesystems. 190 191 If you've selected TMPFS, it's possible that you'll also need 192 this option as there are a number of Linux distros that require 193 POSIX ACL support under /dev for certain features to work properly. 194 For example, some distros need this feature for ALSA-related /dev 195 files for sound to work properly. In short, if you're not sure, 196 say Y. 197 198config TMPFS_XATTR 199 bool "Tmpfs extended attributes" 200 depends on TMPFS 201 default n 202 help 203 Extended attributes are name:value pairs associated with inodes by 204 the kernel or by users (see the attr(5) manual page for details). 205 206 This enables support for the trusted.*, security.* and user.* 207 namespaces. 208 209 You need this for POSIX ACL support on tmpfs. 210 211 If unsure, say N. 212 213config TMPFS_INODE64 214 bool "Use 64-bit ino_t by default in tmpfs" 215 depends on TMPFS && 64BIT 216 default n 217 help 218 tmpfs has historically used only inode numbers as wide as an unsigned 219 int. In some cases this can cause wraparound, potentially resulting 220 in multiple files with the same inode number on a single device. This 221 option makes tmpfs use the full width of ino_t by default, without 222 needing to specify the inode64 option when mounting. 223 224 But if a long-lived tmpfs is to be accessed by 32-bit applications so 225 ancient that opening a file larger than 2GiB fails with EINVAL, then 226 the INODE64 config option and inode64 mount option risk operations 227 failing with EOVERFLOW once 33-bit inode numbers are reached. 228 229 To override this configured default, use the inode32 or inode64 230 option when mounting. 231 232 If unsure, say N. 233 234config TMPFS_QUOTA 235 bool "Tmpfs quota support" 236 depends on TMPFS 237 select QUOTA 238 help 239 Quota support allows to set per user and group limits for tmpfs 240 usage. Say Y to enable quota support. Once enabled you can control 241 user and group quota enforcement with quota, usrquota and grpquota 242 mount options. 243 244 If unsure, say N. 245 246config ARCH_SUPPORTS_HUGETLBFS 247 def_bool n 248 249menuconfig HUGETLBFS 250 bool "HugeTLB file system support" 251 depends on ARCH_SUPPORTS_HUGETLBFS 252 depends on (SYSFS || SYSCTL) 253 select MEMFD_CREATE 254 select PADATA if SMP 255 help 256 hugetlbfs is a filesystem backing for HugeTLB pages, based on 257 ramfs. For architectures that support it, say Y here and read 258 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 259 260 If unsure, say N. 261 262if HUGETLBFS 263config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 264 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 265 default n 266 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 267 help 268 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to 269 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 270 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 271endif # HUGETLBFS 272 273config HUGETLB_PAGE 274 def_bool HUGETLBFS 275 select XARRAY_MULTI 276 277config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 278 def_bool HUGETLB_PAGE 279 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 280 depends on SPARSEMEM_VMEMMAP 281 select SPARSEMEM_VMEMMAP_PREINIT if ARCH_WANT_HUGETLB_VMEMMAP_PREINIT 282 283config HUGETLB_PMD_PAGE_TABLE_SHARING 284 def_bool HUGETLB_PAGE 285 depends on ARCH_WANT_HUGE_PMD_SHARE && SPLIT_PMD_PTLOCKS 286 287config ARCH_HAS_GIGANTIC_PAGE 288 bool 289 290source "fs/configfs/Kconfig" 291source "fs/efivarfs/Kconfig" 292 293endmenu 294 295menuconfig MISC_FILESYSTEMS 296 bool "Miscellaneous filesystems" 297 default y 298 help 299 Say Y here to get to see options for various miscellaneous 300 filesystems, such as filesystems that came from other 301 operating systems. 302 303 This option alone does not add any kernel code. 304 305 If you say N, all options in this submenu will be skipped and 306 disabled; if unsure, say Y here. 307 308if MISC_FILESYSTEMS 309 310source "fs/orangefs/Kconfig" 311source "fs/adfs/Kconfig" 312source "fs/affs/Kconfig" 313source "fs/ecryptfs/Kconfig" 314source "fs/hfs/Kconfig" 315source "fs/hfsplus/Kconfig" 316source "fs/befs/Kconfig" 317source "fs/bfs/Kconfig" 318source "fs/efs/Kconfig" 319source "fs/jffs2/Kconfig" 320# UBIFS File system configuration 321source "fs/ubifs/Kconfig" 322source "fs/cramfs/Kconfig" 323source "fs/squashfs/Kconfig" 324source "fs/freevxfs/Kconfig" 325source "fs/minix/Kconfig" 326source "fs/omfs/Kconfig" 327source "fs/hpfs/Kconfig" 328source "fs/qnx4/Kconfig" 329source "fs/qnx6/Kconfig" 330source "fs/resctrl/Kconfig" 331source "fs/romfs/Kconfig" 332source "fs/pstore/Kconfig" 333source "fs/ufs/Kconfig" 334source "fs/erofs/Kconfig" 335source "fs/vboxsf/Kconfig" 336 337endif # MISC_FILESYSTEMS 338 339menuconfig NETWORK_FILESYSTEMS 340 bool "Network File Systems" 341 default y 342 depends on NET 343 help 344 Say Y here to get to see options for network filesystems and 345 filesystem-related networking code, such as NFS daemon and 346 RPCSEC security modules. 347 348 This option alone does not add any kernel code. 349 350 If you say N, all options in this submenu will be skipped and 351 disabled; if unsure, say Y here. 352 353if NETWORK_FILESYSTEMS 354 355source "fs/nfs/Kconfig" 356source "fs/nfsd/Kconfig" 357 358config GRACE_PERIOD 359 tristate 360 361config LOCKD 362 tristate 363 depends on FILE_LOCKING 364 select CRC32 365 select GRACE_PERIOD 366 367config LOCKD_V4 368 bool 369 depends on NFSD || NFS_V3 370 depends on FILE_LOCKING 371 default y 372 373config NFS_ACL_SUPPORT 374 tristate 375 select FS_POSIX_ACL 376 377config NFS_COMMON 378 bool 379 depends on NFSD || NFS_FS || LOCKD 380 default y 381 382config NFS_COMMON_LOCALIO_SUPPORT 383 tristate 384 depends on NFS_LOCALIO 385 default y if NFSD=y || NFS_FS=y 386 default m if NFSD=m && NFS_FS=m 387 select SUNRPC 388 389config NFS_LOCALIO 390 bool "NFS client and server support for LOCALIO auxiliary protocol" 391 depends on NFSD && NFS_FS 392 select NFS_COMMON_LOCALIO_SUPPORT 393 default n 394 help 395 Some NFS servers support an auxiliary NFS LOCALIO protocol 396 that is not an official part of the NFS protocol. 397 398 This option enables support for the LOCALIO protocol in the 399 kernel's NFS server and client. Enable this to permit local 400 NFS clients to bypass the network when issuing reads and 401 writes to the local NFS server. 402 403 If unsure, say N. 404 405config NFS_V4_2_SSC_HELPER 406 bool 407 default y if NFS_V4_2 408 409source "net/sunrpc/Kconfig" 410source "fs/ceph/Kconfig" 411 412source "fs/smb/Kconfig" 413source "fs/coda/Kconfig" 414source "fs/afs/Kconfig" 415source "fs/9p/Kconfig" 416 417endif # NETWORK_FILESYSTEMS 418 419source "fs/nls/Kconfig" 420source "fs/dlm/Kconfig" 421source "fs/unicode/Kconfig" 422 423config IO_WQ 424 bool 425 426endmenu 427