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/reiserfs/Kconfig" 47source "fs/jfs/Kconfig" 48 49source "fs/xfs/Kconfig" 50source "fs/gfs2/Kconfig" 51source "fs/ocfs2/Kconfig" 52source "fs/btrfs/Kconfig" 53source "fs/nilfs2/Kconfig" 54source "fs/f2fs/Kconfig" 55source "fs/bcachefs/Kconfig" 56source "fs/zonefs/Kconfig" 57 58endif # BLOCK 59 60config FS_DAX 61 bool "File system based Direct Access (DAX) support" 62 depends on MMU 63 depends on !(ARM || MIPS || SPARC) 64 depends on ZONE_DEVICE || FS_DAX_LIMITED 65 select FS_IOMAP 66 select DAX 67 help 68 Direct Access (DAX) can be used on memory-backed block devices. 69 If the block device supports DAX and the filesystem supports DAX, 70 then you can avoid using the pagecache to buffer I/Os. Turning 71 on this option will compile in support for DAX. 72 73 For a DAX device to support file system access it needs to have 74 struct pages. For the nfit based NVDIMMs this can be enabled 75 using the ndctl utility: 76 77 # ndctl create-namespace --force --reconfig=namespace0.0 \ 78 --mode=fsdax --map=mem 79 80 See the 'create-namespace' man page for details on the overhead of 81 --map=mem: 82 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace 83 84 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most 85 file systems DAX support needs to be manually enabled globally or 86 per-inode using a mount option as well. See the file documentation in 87 Documentation/filesystems/dax.rst for details. 88 89 If you do not have a block device that is capable of using this, 90 or if unsure, say N. Saying Y will increase the size of the kernel 91 by about 5kB. 92 93config FS_DAX_PMD 94 bool 95 default FS_DAX 96 depends on FS_DAX 97 depends on ZONE_DEVICE 98 depends on TRANSPARENT_HUGEPAGE 99 100# Selected by DAX drivers that do not expect filesystem DAX to support 101# get_user_pages() of DAX mappings. I.e. "limited" indicates no support 102# for fork() of processes with MAP_SHARED mappings or support for 103# direct-I/O to a DAX mapping. 104config FS_DAX_LIMITED 105 bool 106 107# Posix ACL utility routines 108# 109# Note: Posix ACLs can be implemented without these helpers. Never use 110# this symbol for ifdefs in core code. 111# 112config FS_POSIX_ACL 113 def_bool n 114 115config EXPORTFS 116 tristate 117 118config EXPORTFS_BLOCK_OPS 119 bool "Enable filesystem export operations for block IO" 120 help 121 This option enables the export operations for a filesystem to support 122 external block IO. 123 124config FILE_LOCKING 125 bool "Enable POSIX file locking API" if EXPERT 126 default y 127 help 128 This option enables standard file locking support, required 129 for filesystems like NFS and for the flock() system 130 call. Disabling this option saves about 11k. 131 132source "fs/crypto/Kconfig" 133 134source "fs/verity/Kconfig" 135 136source "fs/notify/Kconfig" 137 138source "fs/quota/Kconfig" 139 140source "fs/autofs/Kconfig" 141source "fs/fuse/Kconfig" 142source "fs/overlayfs/Kconfig" 143 144menu "Caches" 145 146source "fs/netfs/Kconfig" 147source "fs/cachefiles/Kconfig" 148 149endmenu 150 151if BLOCK 152menu "CD-ROM/DVD Filesystems" 153 154source "fs/isofs/Kconfig" 155source "fs/udf/Kconfig" 156 157endmenu 158endif # BLOCK 159 160if BLOCK 161menu "DOS/FAT/EXFAT/NT Filesystems" 162 163source "fs/fat/Kconfig" 164source "fs/exfat/Kconfig" 165source "fs/ntfs/Kconfig" 166source "fs/ntfs3/Kconfig" 167 168endmenu 169endif # BLOCK 170 171menu "Pseudo filesystems" 172 173source "fs/proc/Kconfig" 174source "fs/kernfs/Kconfig" 175source "fs/sysfs/Kconfig" 176 177config TMPFS 178 bool "Tmpfs virtual memory file system support (former shm fs)" 179 depends on SHMEM 180 select MEMFD_CREATE 181 help 182 Tmpfs is a file system which keeps all files in virtual memory. 183 184 Everything in tmpfs is temporary in the sense that no files will be 185 created on your hard drive. The files live in memory and swap 186 space. If you unmount a tmpfs instance, everything stored therein is 187 lost. 188 189 See <file:Documentation/filesystems/tmpfs.rst> for details. 190 191config TMPFS_POSIX_ACL 192 bool "Tmpfs POSIX Access Control Lists" 193 depends on TMPFS 194 select TMPFS_XATTR 195 select FS_POSIX_ACL 196 help 197 POSIX Access Control Lists (ACLs) support additional access rights 198 for users and groups beyond the standard owner/group/world scheme, 199 and this option selects support for ACLs specifically for tmpfs 200 filesystems. 201 202 If you've selected TMPFS, it's possible that you'll also need 203 this option as there are a number of Linux distros that require 204 POSIX ACL support under /dev for certain features to work properly. 205 For example, some distros need this feature for ALSA-related /dev 206 files for sound to work properly. In short, if you're not sure, 207 say Y. 208 209config TMPFS_XATTR 210 bool "Tmpfs extended attributes" 211 depends on TMPFS 212 default n 213 help 214 Extended attributes are name:value pairs associated with inodes by 215 the kernel or by users (see the attr(5) manual page for details). 216 217 This enables support for the trusted.*, security.* and user.* 218 namespaces. 219 220 You need this for POSIX ACL support on tmpfs. 221 222 If unsure, say N. 223 224config TMPFS_INODE64 225 bool "Use 64-bit ino_t by default in tmpfs" 226 depends on TMPFS && 64BIT 227 default n 228 help 229 tmpfs has historically used only inode numbers as wide as an unsigned 230 int. In some cases this can cause wraparound, potentially resulting 231 in multiple files with the same inode number on a single device. This 232 option makes tmpfs use the full width of ino_t by default, without 233 needing to specify the inode64 option when mounting. 234 235 But if a long-lived tmpfs is to be accessed by 32-bit applications so 236 ancient that opening a file larger than 2GiB fails with EINVAL, then 237 the INODE64 config option and inode64 mount option risk operations 238 failing with EOVERFLOW once 33-bit inode numbers are reached. 239 240 To override this configured default, use the inode32 or inode64 241 option when mounting. 242 243 If unsure, say N. 244 245config TMPFS_QUOTA 246 bool "Tmpfs quota support" 247 depends on TMPFS 248 select QUOTA 249 help 250 Quota support allows to set per user and group limits for tmpfs 251 usage. Say Y to enable quota support. Once enabled you can control 252 user and group quota enforcement with quota, usrquota and grpquota 253 mount options. 254 255 If unsure, say N. 256 257config ARCH_SUPPORTS_HUGETLBFS 258 def_bool n 259 260menuconfig HUGETLBFS 261 bool "HugeTLB file system support" 262 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 263 depends on (SYSFS || SYSCTL) 264 select MEMFD_CREATE 265 help 266 hugetlbfs is a filesystem backing for HugeTLB pages, based on 267 ramfs. For architectures that support it, say Y here and read 268 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 269 270 If unsure, say N. 271 272if HUGETLBFS 273config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 274 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 275 default n 276 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 277 help 278 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to 279 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 280 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 281endif # HUGETLBFS 282 283config HUGETLB_PAGE 284 def_bool HUGETLBFS 285 select XARRAY_MULTI 286 287config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 288 def_bool HUGETLB_PAGE 289 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 290 depends on SPARSEMEM_VMEMMAP 291 292config ARCH_HAS_GIGANTIC_PAGE 293 bool 294 295source "fs/configfs/Kconfig" 296source "fs/efivarfs/Kconfig" 297 298endmenu 299 300menuconfig MISC_FILESYSTEMS 301 bool "Miscellaneous filesystems" 302 default y 303 help 304 Say Y here to get to see options for various miscellaneous 305 filesystems, such as filesystems that came from other 306 operating systems. 307 308 This option alone does not add any kernel code. 309 310 If you say N, all options in this submenu will be skipped and 311 disabled; if unsure, say Y here. 312 313if MISC_FILESYSTEMS 314 315source "fs/orangefs/Kconfig" 316source "fs/adfs/Kconfig" 317source "fs/affs/Kconfig" 318source "fs/ecryptfs/Kconfig" 319source "fs/hfs/Kconfig" 320source "fs/hfsplus/Kconfig" 321source "fs/befs/Kconfig" 322source "fs/bfs/Kconfig" 323source "fs/efs/Kconfig" 324source "fs/jffs2/Kconfig" 325# UBIFS File system configuration 326source "fs/ubifs/Kconfig" 327source "fs/cramfs/Kconfig" 328source "fs/squashfs/Kconfig" 329source "fs/freevxfs/Kconfig" 330source "fs/minix/Kconfig" 331source "fs/omfs/Kconfig" 332source "fs/hpfs/Kconfig" 333source "fs/qnx4/Kconfig" 334source "fs/qnx6/Kconfig" 335source "fs/romfs/Kconfig" 336source "fs/pstore/Kconfig" 337source "fs/sysv/Kconfig" 338source "fs/ufs/Kconfig" 339source "fs/erofs/Kconfig" 340source "fs/vboxsf/Kconfig" 341 342endif # MISC_FILESYSTEMS 343 344menuconfig NETWORK_FILESYSTEMS 345 bool "Network File Systems" 346 default y 347 depends on NET 348 help 349 Say Y here to get to see options for network filesystems and 350 filesystem-related networking code, such as NFS daemon and 351 RPCSEC security modules. 352 353 This option alone does not add any kernel code. 354 355 If you say N, all options in this submenu will be skipped and 356 disabled; if unsure, say Y here. 357 358if NETWORK_FILESYSTEMS 359 360source "fs/nfs/Kconfig" 361source "fs/nfsd/Kconfig" 362 363config GRACE_PERIOD 364 tristate 365 366config LOCKD 367 tristate 368 depends on FILE_LOCKING 369 select GRACE_PERIOD 370 371config LOCKD_V4 372 bool 373 depends on NFSD || NFS_V3 374 depends on FILE_LOCKING 375 default y 376 377config NFS_ACL_SUPPORT 378 tristate 379 select FS_POSIX_ACL 380 381config NFS_COMMON 382 bool 383 depends on NFSD || NFS_FS || LOCKD 384 default y 385 386config NFS_V4_2_SSC_HELPER 387 bool 388 default y if NFS_V4_2 389 390source "net/sunrpc/Kconfig" 391source "fs/ceph/Kconfig" 392 393source "fs/smb/Kconfig" 394source "fs/coda/Kconfig" 395source "fs/afs/Kconfig" 396source "fs/9p/Kconfig" 397 398endif # NETWORK_FILESYSTEMS 399 400source "fs/nls/Kconfig" 401source "fs/dlm/Kconfig" 402source "fs/unicode/Kconfig" 403 404config IO_WQ 405 bool 406 407endmenu 408