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 21config BUFFER_HEAD 22 bool 23 24# old blockdev_direct_IO implementation. Use iomap for new code instead 25config LEGACY_DIRECT_IO 26 depends on BUFFER_HEAD 27 bool 28 29if BLOCK 30 31source "fs/ext2/Kconfig" 32source "fs/ext4/Kconfig" 33source "fs/hmdfs/Kconfig" 34source "fs/sharefs/Kconfig" 35source "fs/jbd2/Kconfig" 36 37config FS_MBCACHE 38# Meta block cache for Extended Attributes (ext2/ext3/ext4) 39 tristate 40 default y if EXT2_FS=y && EXT2_FS_XATTR 41 default y if EXT4_FS=y 42 default m if EXT2_FS_XATTR || EXT4_FS 43 44source "fs/reiserfs/Kconfig" 45source "fs/jfs/Kconfig" 46 47source "fs/xfs/Kconfig" 48source "fs/gfs2/Kconfig" 49source "fs/ocfs2/Kconfig" 50source "fs/btrfs/Kconfig" 51source "fs/nilfs2/Kconfig" 52source "fs/f2fs/Kconfig" 53source "fs/zonefs/Kconfig" 54 55endif # BLOCK 56 57config FS_DAX 58 bool "File system based Direct Access (DAX) support" 59 depends on MMU 60 depends on !(ARM || MIPS || SPARC) 61 depends on ZONE_DEVICE || FS_DAX_LIMITED 62 select FS_IOMAP 63 select DAX 64 help 65 Direct Access (DAX) can be used on memory-backed block devices. 66 If the block device supports DAX and the filesystem supports DAX, 67 then you can avoid using the pagecache to buffer I/Os. Turning 68 on this option will compile in support for DAX. 69 70 For a DAX device to support file system access it needs to have 71 struct pages. For the nfit based NVDIMMs this can be enabled 72 using the ndctl utility: 73 74 # ndctl create-namespace --force --reconfig=namespace0.0 \ 75 --mode=fsdax --map=mem 76 77 See the 'create-namespace' man page for details on the overhead of 78 --map=mem: 79 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace 80 81 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most 82 file systems DAX support needs to be manually enabled globally or 83 per-inode using a mount option as well. See the file documentation in 84 Documentation/filesystems/dax.rst for details. 85 86 If you do not have a block device that is capable of using this, 87 or if unsure, say N. Saying Y will increase the size of the kernel 88 by about 5kB. 89 90config FS_DAX_PMD 91 bool 92 default FS_DAX 93 depends on FS_DAX 94 depends on ZONE_DEVICE 95 depends on TRANSPARENT_HUGEPAGE 96 97# Selected by DAX drivers that do not expect filesystem DAX to support 98# get_user_pages() of DAX mappings. I.e. "limited" indicates no support 99# for fork() of processes with MAP_SHARED mappings or support for 100# direct-I/O to a DAX mapping. 101config FS_DAX_LIMITED 102 bool 103 104# Posix ACL utility routines 105# 106# Note: Posix ACLs can be implemented without these helpers. Never use 107# this symbol for ifdefs in core code. 108# 109config FS_POSIX_ACL 110 def_bool n 111 112config EXPORTFS 113 tristate 114 115config EXPORTFS_BLOCK_OPS 116 bool "Enable filesystem export operations for block IO" 117 help 118 This option enables the export operations for a filesystem to support 119 external block IO. 120 121config FILE_LOCKING 122 bool "Enable POSIX file locking API" if EXPERT 123 default y 124 help 125 This option enables standard file locking support, required 126 for filesystems like NFS and for the flock() system 127 call. Disabling this option saves about 11k. 128 129source "fs/crypto/Kconfig" 130 131source "fs/verity/Kconfig" 132 133source "fs/notify/Kconfig" 134 135source "fs/quota/Kconfig" 136 137source "fs/autofs/Kconfig" 138source "fs/fuse/Kconfig" 139source "fs/overlayfs/Kconfig" 140 141menu "Caches" 142 143source "fs/netfs/Kconfig" 144source "fs/fscache/Kconfig" 145source "fs/cachefiles/Kconfig" 146 147endmenu 148 149if BLOCK 150menu "CD-ROM/DVD Filesystems" 151 152source "fs/isofs/Kconfig" 153source "fs/udf/Kconfig" 154 155endmenu 156endif # BLOCK 157 158if BLOCK 159menu "DOS/FAT/EXFAT/NT Filesystems" 160 161source "fs/fat/Kconfig" 162source "fs/exfat/Kconfig" 163source "fs/ntfs/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 258config HUGETLBFS 259 bool "HugeTLB file system support" 260 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 261 depends on (SYSFS || SYSCTL) 262 select MEMFD_CREATE 263 help 264 hugetlbfs is a filesystem backing for HugeTLB pages, based on 265 ramfs. For architectures that support it, say Y here and read 266 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 267 268 If unsure, say N. 269 270config HUGETLB_PAGE 271 def_bool HUGETLBFS 272 273config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 274 def_bool HUGETLB_PAGE 275 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 276 depends on SPARSEMEM_VMEMMAP 277 278config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 279 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 280 default n 281 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 282 help 283 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to 284 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 285 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 286 287config ARCH_HAS_GIGANTIC_PAGE 288 bool 289 290source "fs/configfs/Kconfig" 291source "fs/efivarfs/Kconfig" 292 293endmenu 294 295menuconfig MISC_FILESYSTEMS 296 bool "Miscellaneous filesystems" 297 default y 298 help 299 Say Y here to get to see options for various miscellaneous 300 filesystems, such as filesystems that came from other 301 operating systems. 302 303 This option alone does not add any kernel code. 304 305 If you say N, all options in this submenu will be skipped and 306 disabled; if unsure, say Y here. 307 308if MISC_FILESYSTEMS 309 310source "fs/orangefs/Kconfig" 311source "fs/adfs/Kconfig" 312source "fs/affs/Kconfig" 313source "fs/ecryptfs/Kconfig" 314source "fs/hfs/Kconfig" 315source "fs/hfsplus/Kconfig" 316source "fs/befs/Kconfig" 317source "fs/bfs/Kconfig" 318source "fs/efs/Kconfig" 319source "fs/jffs2/Kconfig" 320# UBIFS File system configuration 321source "fs/ubifs/Kconfig" 322source "fs/cramfs/Kconfig" 323source "fs/squashfs/Kconfig" 324source "fs/freevxfs/Kconfig" 325source "fs/minix/Kconfig" 326source "fs/omfs/Kconfig" 327source "fs/hpfs/Kconfig" 328source "fs/qnx4/Kconfig" 329source "fs/qnx6/Kconfig" 330source "fs/romfs/Kconfig" 331source "fs/pstore/Kconfig" 332source "fs/sysv/Kconfig" 333source "fs/ufs/Kconfig" 334source "fs/erofs/Kconfig" 335source "fs/vboxsf/Kconfig" 336 337endif # MISC_FILESYSTEMS 338 339menuconfig NETWORK_FILESYSTEMS 340 bool "Network File Systems" 341 default y 342 depends on NET 343 help 344 Say Y here to get to see options for network filesystems and 345 filesystem-related networking code, such as NFS daemon and 346 RPCSEC security modules. 347 348 This option alone does not add any kernel code. 349 350 If you say N, all options in this submenu will be skipped and 351 disabled; if unsure, say Y here. 352 353if NETWORK_FILESYSTEMS 354 355source "fs/nfs/Kconfig" 356source "fs/nfsd/Kconfig" 357 358config GRACE_PERIOD 359 tristate 360 361config LOCKD 362 tristate 363 depends on FILE_LOCKING 364 select GRACE_PERIOD 365 366config LOCKD_V4 367 bool 368 depends on NFSD || NFS_V3 369 depends on FILE_LOCKING 370 default y 371 372config NFS_ACL_SUPPORT 373 tristate 374 select FS_POSIX_ACL 375 376config NFS_COMMON 377 bool 378 depends on NFSD || NFS_FS || LOCKD 379 default y 380 381config NFS_V4_2_SSC_HELPER 382 bool 383 default y if NFS_V4_2 384 385source "net/sunrpc/Kconfig" 386source "fs/ceph/Kconfig" 387 388source "fs/smb/Kconfig" 389source "fs/coda/Kconfig" 390source "fs/afs/Kconfig" 391source "fs/9p/Kconfig" 392 393endif # NETWORK_FILESYSTEMS 394 395source "fs/nls/Kconfig" 396source "fs/dlm/Kconfig" 397source "fs/unicode/Kconfig" 398source "fs/epfs/Kconfig" 399 400config IO_WQ 401 bool 402 403endmenu 404