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 ZONE_DEVICE || FS_DAX_LIMITED 64 select FS_IOMAP 65 select DAX 66 help 67 Direct Access (DAX) can be used on memory-backed block devices. 68 If the block device supports DAX and the filesystem supports DAX, 69 then you can avoid using the pagecache to buffer I/Os. Turning 70 on this option will compile in support for DAX. 71 72 For a DAX device to support file system access it needs to have 73 struct pages. For the nfit based NVDIMMs this can be enabled 74 using the ndctl utility: 75 76 # ndctl create-namespace --force --reconfig=namespace0.0 \ 77 --mode=fsdax --map=mem 78 79 See the 'create-namespace' man page for details on the overhead of 80 --map=mem: 81 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace 82 83 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most 84 file systems DAX support needs to be manually enabled globally or 85 per-inode using a mount option as well. See the file documentation in 86 Documentation/filesystems/dax.rst for details. 87 88 If you do not have a block device that is capable of using this, 89 or if unsure, say N. Saying Y will increase the size of the kernel 90 by about 5kB. 91 92config FS_DAX_PMD 93 bool 94 default FS_DAX 95 depends on FS_DAX 96 depends on ZONE_DEVICE 97 depends on TRANSPARENT_HUGEPAGE 98 99# Selected by DAX drivers that do not expect filesystem DAX to support 100# get_user_pages() of DAX mappings. I.e. "limited" indicates no support 101# for fork() of processes with MAP_SHARED mappings or support for 102# direct-I/O to a DAX mapping. 103config FS_DAX_LIMITED 104 bool 105 106# Posix ACL utility routines 107# 108# Note: Posix ACLs can be implemented without these helpers. Never use 109# this symbol for ifdefs in core code. 110# 111config FS_POSIX_ACL 112 def_bool n 113 114config EXPORTFS 115 tristate 116 117config EXPORTFS_BLOCK_OPS 118 bool "Enable filesystem export operations for block IO" 119 help 120 This option enables the export operations for a filesystem to support 121 external block IO. 122 123config FILE_LOCKING 124 bool "Enable POSIX file locking API" if EXPERT 125 default y 126 help 127 This option enables standard file locking support, required 128 for filesystems like NFS and for the flock() system 129 call. Disabling this option saves about 11k. 130 131source "fs/crypto/Kconfig" 132 133source "fs/verity/Kconfig" 134 135source "fs/notify/Kconfig" 136 137source "fs/quota/Kconfig" 138 139source "fs/autofs/Kconfig" 140source "fs/fuse/Kconfig" 141source "fs/overlayfs/Kconfig" 142 143menu "Caches" 144 145source "fs/netfs/Kconfig" 146source "fs/cachefiles/Kconfig" 147 148endmenu 149 150if BLOCK 151menu "CD-ROM/DVD Filesystems" 152 153source "fs/isofs/Kconfig" 154source "fs/udf/Kconfig" 155 156endmenu 157endif # BLOCK 158 159if BLOCK 160menu "DOS/FAT/EXFAT/NT Filesystems" 161 162source "fs/fat/Kconfig" 163source "fs/exfat/Kconfig" 164source "fs/ntfs/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 select PADATA if SMP 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