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/ntfs3/Kconfig" 166 167endmenu 168endif # BLOCK 169 170menu "Pseudo filesystems" 171 172source "fs/proc/Kconfig" 173source "fs/kernfs/Kconfig" 174source "fs/sysfs/Kconfig" 175 176config TMPFS 177 bool "Tmpfs virtual memory file system support (former shm fs)" 178 depends on SHMEM 179 select MEMFD_CREATE 180 help 181 Tmpfs is a file system which keeps all files in virtual memory. 182 183 Everything in tmpfs is temporary in the sense that no files will be 184 created on your hard drive. The files live in memory and swap 185 space. If you unmount a tmpfs instance, everything stored therein is 186 lost. 187 188 See <file:Documentation/filesystems/tmpfs.rst> for details. 189 190config TMPFS_POSIX_ACL 191 bool "Tmpfs POSIX Access Control Lists" 192 depends on TMPFS 193 select TMPFS_XATTR 194 select FS_POSIX_ACL 195 help 196 POSIX Access Control Lists (ACLs) support additional access rights 197 for users and groups beyond the standard owner/group/world scheme, 198 and this option selects support for ACLs specifically for tmpfs 199 filesystems. 200 201 If you've selected TMPFS, it's possible that you'll also need 202 this option as there are a number of Linux distros that require 203 POSIX ACL support under /dev for certain features to work properly. 204 For example, some distros need this feature for ALSA-related /dev 205 files for sound to work properly. In short, if you're not sure, 206 say Y. 207 208config TMPFS_XATTR 209 bool "Tmpfs extended attributes" 210 depends on TMPFS 211 default n 212 help 213 Extended attributes are name:value pairs associated with inodes by 214 the kernel or by users (see the attr(5) manual page for details). 215 216 This enables support for the trusted.*, security.* and user.* 217 namespaces. 218 219 You need this for POSIX ACL support on tmpfs. 220 221 If unsure, say N. 222 223config TMPFS_INODE64 224 bool "Use 64-bit ino_t by default in tmpfs" 225 depends on TMPFS && 64BIT 226 default n 227 help 228 tmpfs has historically used only inode numbers as wide as an unsigned 229 int. In some cases this can cause wraparound, potentially resulting 230 in multiple files with the same inode number on a single device. This 231 option makes tmpfs use the full width of ino_t by default, without 232 needing to specify the inode64 option when mounting. 233 234 But if a long-lived tmpfs is to be accessed by 32-bit applications so 235 ancient that opening a file larger than 2GiB fails with EINVAL, then 236 the INODE64 config option and inode64 mount option risk operations 237 failing with EOVERFLOW once 33-bit inode numbers are reached. 238 239 To override this configured default, use the inode32 or inode64 240 option when mounting. 241 242 If unsure, say N. 243 244config TMPFS_QUOTA 245 bool "Tmpfs quota support" 246 depends on TMPFS 247 select QUOTA 248 help 249 Quota support allows to set per user and group limits for tmpfs 250 usage. Say Y to enable quota support. Once enabled you can control 251 user and group quota enforcement with quota, usrquota and grpquota 252 mount options. 253 254 If unsure, say N. 255 256config ARCH_SUPPORTS_HUGETLBFS 257 def_bool n 258 259menuconfig HUGETLBFS 260 bool "HugeTLB file system support" 261 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 262 depends on (SYSFS || SYSCTL) 263 select MEMFD_CREATE 264 help 265 hugetlbfs is a filesystem backing for HugeTLB pages, based on 266 ramfs. For architectures that support it, say Y here and read 267 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 268 269 If unsure, say N. 270 271if HUGETLBFS 272config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 273 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 274 default n 275 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 276 help 277 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to 278 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 279 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 280endif # HUGETLBFS 281 282config HUGETLB_PAGE 283 def_bool HUGETLBFS 284 select XARRAY_MULTI 285 286config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 287 def_bool HUGETLB_PAGE 288 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 289 depends on SPARSEMEM_VMEMMAP 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