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/fscache/Kconfig" 148source "fs/cachefiles/Kconfig" 149 150endmenu 151 152if BLOCK 153menu "CD-ROM/DVD Filesystems" 154 155source "fs/isofs/Kconfig" 156source "fs/udf/Kconfig" 157 158endmenu 159endif # BLOCK 160 161if BLOCK 162menu "DOS/FAT/EXFAT/NT Filesystems" 163 164source "fs/fat/Kconfig" 165source "fs/exfat/Kconfig" 166source "fs/ntfs/Kconfig" 167source "fs/ntfs3/Kconfig" 168 169endmenu 170endif # BLOCK 171 172menu "Pseudo filesystems" 173 174source "fs/proc/Kconfig" 175source "fs/kernfs/Kconfig" 176source "fs/sysfs/Kconfig" 177 178config TMPFS 179 bool "Tmpfs virtual memory file system support (former shm fs)" 180 depends on SHMEM 181 select MEMFD_CREATE 182 help 183 Tmpfs is a file system which keeps all files in virtual memory. 184 185 Everything in tmpfs is temporary in the sense that no files will be 186 created on your hard drive. The files live in memory and swap 187 space. If you unmount a tmpfs instance, everything stored therein is 188 lost. 189 190 See <file:Documentation/filesystems/tmpfs.rst> for details. 191 192config TMPFS_POSIX_ACL 193 bool "Tmpfs POSIX Access Control Lists" 194 depends on TMPFS 195 select TMPFS_XATTR 196 select FS_POSIX_ACL 197 help 198 POSIX Access Control Lists (ACLs) support additional access rights 199 for users and groups beyond the standard owner/group/world scheme, 200 and this option selects support for ACLs specifically for tmpfs 201 filesystems. 202 203 If you've selected TMPFS, it's possible that you'll also need 204 this option as there are a number of Linux distros that require 205 POSIX ACL support under /dev for certain features to work properly. 206 For example, some distros need this feature for ALSA-related /dev 207 files for sound to work properly. In short, if you're not sure, 208 say Y. 209 210config TMPFS_XATTR 211 bool "Tmpfs extended attributes" 212 depends on TMPFS 213 default n 214 help 215 Extended attributes are name:value pairs associated with inodes by 216 the kernel or by users (see the attr(5) manual page for details). 217 218 This enables support for the trusted.*, security.* and user.* 219 namespaces. 220 221 You need this for POSIX ACL support on tmpfs. 222 223 If unsure, say N. 224 225config TMPFS_INODE64 226 bool "Use 64-bit ino_t by default in tmpfs" 227 depends on TMPFS && 64BIT 228 default n 229 help 230 tmpfs has historically used only inode numbers as wide as an unsigned 231 int. In some cases this can cause wraparound, potentially resulting 232 in multiple files with the same inode number on a single device. This 233 option makes tmpfs use the full width of ino_t by default, without 234 needing to specify the inode64 option when mounting. 235 236 But if a long-lived tmpfs is to be accessed by 32-bit applications so 237 ancient that opening a file larger than 2GiB fails with EINVAL, then 238 the INODE64 config option and inode64 mount option risk operations 239 failing with EOVERFLOW once 33-bit inode numbers are reached. 240 241 To override this configured default, use the inode32 or inode64 242 option when mounting. 243 244 If unsure, say N. 245 246config TMPFS_QUOTA 247 bool "Tmpfs quota support" 248 depends on TMPFS 249 select QUOTA 250 help 251 Quota support allows to set per user and group limits for tmpfs 252 usage. Say Y to enable quota support. Once enabled you can control 253 user and group quota enforcement with quota, usrquota and grpquota 254 mount options. 255 256 If unsure, say N. 257 258config ARCH_SUPPORTS_HUGETLBFS 259 def_bool n 260 261config HUGETLBFS 262 bool "HugeTLB file system support" 263 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 264 depends on (SYSFS || SYSCTL) 265 select MEMFD_CREATE 266 help 267 hugetlbfs is a filesystem backing for HugeTLB pages, based on 268 ramfs. For architectures that support it, say Y here and read 269 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 270 271 If unsure, say N. 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 282config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 283 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 284 default n 285 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 286 help 287 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to 288 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 289 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 290 291config ARCH_HAS_GIGANTIC_PAGE 292 bool 293 294source "fs/configfs/Kconfig" 295source "fs/efivarfs/Kconfig" 296 297endmenu 298 299menuconfig MISC_FILESYSTEMS 300 bool "Miscellaneous filesystems" 301 default y 302 help 303 Say Y here to get to see options for various miscellaneous 304 filesystems, such as filesystems that came from other 305 operating systems. 306 307 This option alone does not add any kernel code. 308 309 If you say N, all options in this submenu will be skipped and 310 disabled; if unsure, say Y here. 311 312if MISC_FILESYSTEMS 313 314source "fs/orangefs/Kconfig" 315source "fs/adfs/Kconfig" 316source "fs/affs/Kconfig" 317source "fs/ecryptfs/Kconfig" 318source "fs/hfs/Kconfig" 319source "fs/hfsplus/Kconfig" 320source "fs/befs/Kconfig" 321source "fs/bfs/Kconfig" 322source "fs/efs/Kconfig" 323source "fs/jffs2/Kconfig" 324# UBIFS File system configuration 325source "fs/ubifs/Kconfig" 326source "fs/cramfs/Kconfig" 327source "fs/squashfs/Kconfig" 328source "fs/freevxfs/Kconfig" 329source "fs/minix/Kconfig" 330source "fs/omfs/Kconfig" 331source "fs/hpfs/Kconfig" 332source "fs/qnx4/Kconfig" 333source "fs/qnx6/Kconfig" 334source "fs/romfs/Kconfig" 335source "fs/pstore/Kconfig" 336source "fs/sysv/Kconfig" 337source "fs/ufs/Kconfig" 338source "fs/erofs/Kconfig" 339source "fs/vboxsf/Kconfig" 340 341endif # MISC_FILESYSTEMS 342 343menuconfig NETWORK_FILESYSTEMS 344 bool "Network File Systems" 345 default y 346 depends on NET 347 help 348 Say Y here to get to see options for network filesystems and 349 filesystem-related networking code, such as NFS daemon and 350 RPCSEC security modules. 351 352 This option alone does not add any kernel code. 353 354 If you say N, all options in this submenu will be skipped and 355 disabled; if unsure, say Y here. 356 357if NETWORK_FILESYSTEMS 358 359source "fs/nfs/Kconfig" 360source "fs/nfsd/Kconfig" 361 362config GRACE_PERIOD 363 tristate 364 365config LOCKD 366 tristate 367 depends on FILE_LOCKING 368 select GRACE_PERIOD 369 370config LOCKD_V4 371 bool 372 depends on NFSD || NFS_V3 373 depends on FILE_LOCKING 374 default y 375 376config NFS_ACL_SUPPORT 377 tristate 378 select FS_POSIX_ACL 379 380config NFS_COMMON 381 bool 382 depends on NFSD || NFS_FS || LOCKD 383 default y 384 385config NFS_V4_2_SSC_HELPER 386 bool 387 default y if NFS_V4_2 388 389source "net/sunrpc/Kconfig" 390source "fs/ceph/Kconfig" 391 392source "fs/smb/Kconfig" 393source "fs/coda/Kconfig" 394source "fs/afs/Kconfig" 395source "fs/9p/Kconfig" 396 397endif # NETWORK_FILESYSTEMS 398 399source "fs/nls/Kconfig" 400source "fs/dlm/Kconfig" 401source "fs/unicode/Kconfig" 402 403config IO_WQ 404 bool 405 406endmenu 407