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/ntfs3/Kconfig" 165 166endmenu 167endif # BLOCK 168 169menu "Pseudo filesystems" 170 171source "fs/proc/Kconfig" 172source "fs/kernfs/Kconfig" 173source "fs/sysfs/Kconfig" 174 175config TMPFS 176 bool "Tmpfs virtual memory file system support (former shm fs)" 177 depends on SHMEM 178 select MEMFD_CREATE 179 help 180 Tmpfs is a file system which keeps all files in virtual memory. 181 182 Everything in tmpfs is temporary in the sense that no files will be 183 created on your hard drive. The files live in memory and swap 184 space. If you unmount a tmpfs instance, everything stored therein is 185 lost. 186 187 See <file:Documentation/filesystems/tmpfs.rst> for details. 188 189config TMPFS_POSIX_ACL 190 bool "Tmpfs POSIX Access Control Lists" 191 depends on TMPFS 192 select TMPFS_XATTR 193 select FS_POSIX_ACL 194 help 195 POSIX Access Control Lists (ACLs) support additional access rights 196 for users and groups beyond the standard owner/group/world scheme, 197 and this option selects support for ACLs specifically for tmpfs 198 filesystems. 199 200 If you've selected TMPFS, it's possible that you'll also need 201 this option as there are a number of Linux distros that require 202 POSIX ACL support under /dev for certain features to work properly. 203 For example, some distros need this feature for ALSA-related /dev 204 files for sound to work properly. In short, if you're not sure, 205 say Y. 206 207config TMPFS_XATTR 208 bool "Tmpfs extended attributes" 209 depends on TMPFS 210 default n 211 help 212 Extended attributes are name:value pairs associated with inodes by 213 the kernel or by users (see the attr(5) manual page for details). 214 215 This enables support for the trusted.*, security.* and user.* 216 namespaces. 217 218 You need this for POSIX ACL support on tmpfs. 219 220 If unsure, say N. 221 222config TMPFS_INODE64 223 bool "Use 64-bit ino_t by default in tmpfs" 224 depends on TMPFS && 64BIT 225 default n 226 help 227 tmpfs has historically used only inode numbers as wide as an unsigned 228 int. In some cases this can cause wraparound, potentially resulting 229 in multiple files with the same inode number on a single device. This 230 option makes tmpfs use the full width of ino_t by default, without 231 needing to specify the inode64 option when mounting. 232 233 But if a long-lived tmpfs is to be accessed by 32-bit applications so 234 ancient that opening a file larger than 2GiB fails with EINVAL, then 235 the INODE64 config option and inode64 mount option risk operations 236 failing with EOVERFLOW once 33-bit inode numbers are reached. 237 238 To override this configured default, use the inode32 or inode64 239 option when mounting. 240 241 If unsure, say N. 242 243config TMPFS_QUOTA 244 bool "Tmpfs quota support" 245 depends on TMPFS 246 select QUOTA 247 help 248 Quota support allows to set per user and group limits for tmpfs 249 usage. Say Y to enable quota support. Once enabled you can control 250 user and group quota enforcement with quota, usrquota and grpquota 251 mount options. 252 253 If unsure, say N. 254 255config ARCH_SUPPORTS_HUGETLBFS 256 def_bool n 257 258menuconfig HUGETLBFS 259 bool "HugeTLB file system support" 260 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 261 depends on (SYSFS || SYSCTL) 262 select MEMFD_CREATE 263 select PADATA if SMP 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