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 FS_PID 178 bool "Pseudo filesystem for process file descriptors" 179 depends on 64BIT 180 default y 181 help 182 Pidfs implements advanced features for process file descriptors. 183 184config TMPFS 185 bool "Tmpfs virtual memory file system support (former shm fs)" 186 depends on SHMEM 187 select MEMFD_CREATE 188 help 189 Tmpfs is a file system which keeps all files in virtual memory. 190 191 Everything in tmpfs is temporary in the sense that no files will be 192 created on your hard drive. The files live in memory and swap 193 space. If you unmount a tmpfs instance, everything stored therein is 194 lost. 195 196 See <file:Documentation/filesystems/tmpfs.rst> for details. 197 198config TMPFS_POSIX_ACL 199 bool "Tmpfs POSIX Access Control Lists" 200 depends on TMPFS 201 select TMPFS_XATTR 202 select FS_POSIX_ACL 203 help 204 POSIX Access Control Lists (ACLs) support additional access rights 205 for users and groups beyond the standard owner/group/world scheme, 206 and this option selects support for ACLs specifically for tmpfs 207 filesystems. 208 209 If you've selected TMPFS, it's possible that you'll also need 210 this option as there are a number of Linux distros that require 211 POSIX ACL support under /dev for certain features to work properly. 212 For example, some distros need this feature for ALSA-related /dev 213 files for sound to work properly. In short, if you're not sure, 214 say Y. 215 216config TMPFS_XATTR 217 bool "Tmpfs extended attributes" 218 depends on TMPFS 219 default n 220 help 221 Extended attributes are name:value pairs associated with inodes by 222 the kernel or by users (see the attr(5) manual page for details). 223 224 This enables support for the trusted.*, security.* and user.* 225 namespaces. 226 227 You need this for POSIX ACL support on tmpfs. 228 229 If unsure, say N. 230 231config TMPFS_INODE64 232 bool "Use 64-bit ino_t by default in tmpfs" 233 depends on TMPFS && 64BIT 234 default n 235 help 236 tmpfs has historically used only inode numbers as wide as an unsigned 237 int. In some cases this can cause wraparound, potentially resulting 238 in multiple files with the same inode number on a single device. This 239 option makes tmpfs use the full width of ino_t by default, without 240 needing to specify the inode64 option when mounting. 241 242 But if a long-lived tmpfs is to be accessed by 32-bit applications so 243 ancient that opening a file larger than 2GiB fails with EINVAL, then 244 the INODE64 config option and inode64 mount option risk operations 245 failing with EOVERFLOW once 33-bit inode numbers are reached. 246 247 To override this configured default, use the inode32 or inode64 248 option when mounting. 249 250 If unsure, say N. 251 252config TMPFS_QUOTA 253 bool "Tmpfs quota support" 254 depends on TMPFS 255 select QUOTA 256 help 257 Quota support allows to set per user and group limits for tmpfs 258 usage. Say Y to enable quota support. Once enabled you can control 259 user and group quota enforcement with quota, usrquota and grpquota 260 mount options. 261 262 If unsure, say N. 263 264config ARCH_SUPPORTS_HUGETLBFS 265 def_bool n 266 267menuconfig HUGETLBFS 268 bool "HugeTLB file system support" 269 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 270 depends on (SYSFS || SYSCTL) 271 select MEMFD_CREATE 272 help 273 hugetlbfs is a filesystem backing for HugeTLB pages, based on 274 ramfs. For architectures that support it, say Y here and read 275 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 276 277 If unsure, say N. 278 279if HUGETLBFS 280config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 281 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 282 default n 283 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 284 help 285 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to 286 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 287 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 288endif # HUGETLBFS 289 290config HUGETLB_PAGE 291 def_bool HUGETLBFS 292 select XARRAY_MULTI 293 294config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 295 def_bool HUGETLB_PAGE 296 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 297 depends on SPARSEMEM_VMEMMAP 298 299config ARCH_HAS_GIGANTIC_PAGE 300 bool 301 302source "fs/configfs/Kconfig" 303source "fs/efivarfs/Kconfig" 304 305endmenu 306 307menuconfig MISC_FILESYSTEMS 308 bool "Miscellaneous filesystems" 309 default y 310 help 311 Say Y here to get to see options for various miscellaneous 312 filesystems, such as filesystems that came from other 313 operating systems. 314 315 This option alone does not add any kernel code. 316 317 If you say N, all options in this submenu will be skipped and 318 disabled; if unsure, say Y here. 319 320if MISC_FILESYSTEMS 321 322source "fs/orangefs/Kconfig" 323source "fs/adfs/Kconfig" 324source "fs/affs/Kconfig" 325source "fs/ecryptfs/Kconfig" 326source "fs/hfs/Kconfig" 327source "fs/hfsplus/Kconfig" 328source "fs/befs/Kconfig" 329source "fs/bfs/Kconfig" 330source "fs/efs/Kconfig" 331source "fs/jffs2/Kconfig" 332# UBIFS File system configuration 333source "fs/ubifs/Kconfig" 334source "fs/cramfs/Kconfig" 335source "fs/squashfs/Kconfig" 336source "fs/freevxfs/Kconfig" 337source "fs/minix/Kconfig" 338source "fs/omfs/Kconfig" 339source "fs/hpfs/Kconfig" 340source "fs/qnx4/Kconfig" 341source "fs/qnx6/Kconfig" 342source "fs/romfs/Kconfig" 343source "fs/pstore/Kconfig" 344source "fs/sysv/Kconfig" 345source "fs/ufs/Kconfig" 346source "fs/erofs/Kconfig" 347source "fs/vboxsf/Kconfig" 348 349endif # MISC_FILESYSTEMS 350 351menuconfig NETWORK_FILESYSTEMS 352 bool "Network File Systems" 353 default y 354 depends on NET 355 help 356 Say Y here to get to see options for network filesystems and 357 filesystem-related networking code, such as NFS daemon and 358 RPCSEC security modules. 359 360 This option alone does not add any kernel code. 361 362 If you say N, all options in this submenu will be skipped and 363 disabled; if unsure, say Y here. 364 365if NETWORK_FILESYSTEMS 366 367source "fs/nfs/Kconfig" 368source "fs/nfsd/Kconfig" 369 370config GRACE_PERIOD 371 tristate 372 373config LOCKD 374 tristate 375 depends on FILE_LOCKING 376 select GRACE_PERIOD 377 378config LOCKD_V4 379 bool 380 depends on NFSD || NFS_V3 381 depends on FILE_LOCKING 382 default y 383 384config NFS_ACL_SUPPORT 385 tristate 386 select FS_POSIX_ACL 387 388config NFS_COMMON 389 bool 390 depends on NFSD || NFS_FS || LOCKD 391 default y 392 393config NFS_V4_2_SSC_HELPER 394 bool 395 default y if NFS_V4_2 396 397source "net/sunrpc/Kconfig" 398source "fs/ceph/Kconfig" 399 400source "fs/smb/Kconfig" 401source "fs/coda/Kconfig" 402source "fs/afs/Kconfig" 403source "fs/9p/Kconfig" 404 405endif # NETWORK_FILESYSTEMS 406 407source "fs/nls/Kconfig" 408source "fs/dlm/Kconfig" 409source "fs/unicode/Kconfig" 410 411config IO_WQ 412 bool 413 414endmenu 415