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/jbd2/Kconfig" 34 35config FS_MBCACHE 36# Meta block cache for Extended Attributes (ext2/ext3/ext4) 37 tristate 38 default y if EXT2_FS=y && EXT2_FS_XATTR 39 default y if EXT4_FS=y 40 default m if EXT2_FS_XATTR || EXT4_FS 41 42source "fs/reiserfs/Kconfig" 43source "fs/jfs/Kconfig" 44 45source "fs/xfs/Kconfig" 46source "fs/gfs2/Kconfig" 47source "fs/ocfs2/Kconfig" 48source "fs/btrfs/Kconfig" 49source "fs/nilfs2/Kconfig" 50source "fs/f2fs/Kconfig" 51source "fs/bcachefs/Kconfig" 52source "fs/zonefs/Kconfig" 53 54endif # BLOCK 55 56config FS_DAX 57 bool "File system based Direct Access (DAX) support" 58 depends on MMU 59 depends on !(ARM || MIPS || SPARC) 60 depends on ZONE_DEVICE || FS_DAX_LIMITED 61 select FS_IOMAP 62 select DAX 63 help 64 Direct Access (DAX) can be used on memory-backed block devices. 65 If the block device supports DAX and the filesystem supports DAX, 66 then you can avoid using the pagecache to buffer I/Os. Turning 67 on this option will compile in support for DAX. 68 69 For a DAX device to support file system access it needs to have 70 struct pages. For the nfit based NVDIMMs this can be enabled 71 using the ndctl utility: 72 73 # ndctl create-namespace --force --reconfig=namespace0.0 \ 74 --mode=fsdax --map=mem 75 76 See the 'create-namespace' man page for details on the overhead of 77 --map=mem: 78 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace 79 80 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most 81 file systems DAX support needs to be manually enabled globally or 82 per-inode using a mount option as well. See the file documentation in 83 Documentation/filesystems/dax.rst for details. 84 85 If you do not have a block device that is capable of using this, 86 or if unsure, say N. Saying Y will increase the size of the kernel 87 by about 5kB. 88 89config FS_DAX_PMD 90 bool 91 default FS_DAX 92 depends on FS_DAX 93 depends on ZONE_DEVICE 94 depends on TRANSPARENT_HUGEPAGE 95 96# Selected by DAX drivers that do not expect filesystem DAX to support 97# get_user_pages() of DAX mappings. I.e. "limited" indicates no support 98# for fork() of processes with MAP_SHARED mappings or support for 99# direct-I/O to a DAX mapping. 100config FS_DAX_LIMITED 101 bool 102 103# Posix ACL utility routines 104# 105# Note: Posix ACLs can be implemented without these helpers. Never use 106# this symbol for ifdefs in core code. 107# 108config FS_POSIX_ACL 109 def_bool n 110 111config EXPORTFS 112 tristate 113 114config EXPORTFS_BLOCK_OPS 115 bool "Enable filesystem export operations for block IO" 116 help 117 This option enables the export operations for a filesystem to support 118 external block IO. 119 120config FILE_LOCKING 121 bool "Enable POSIX file locking API" if EXPERT 122 default y 123 help 124 This option enables standard file locking support, required 125 for filesystems like NFS and for the flock() system 126 call. Disabling this option saves about 11k. 127 128source "fs/crypto/Kconfig" 129 130source "fs/verity/Kconfig" 131 132source "fs/notify/Kconfig" 133 134source "fs/quota/Kconfig" 135 136source "fs/autofs/Kconfig" 137source "fs/fuse/Kconfig" 138source "fs/overlayfs/Kconfig" 139 140menu "Caches" 141 142source "fs/netfs/Kconfig" 143source "fs/fscache/Kconfig" 144source "fs/cachefiles/Kconfig" 145 146endmenu 147 148if BLOCK 149menu "CD-ROM/DVD Filesystems" 150 151source "fs/isofs/Kconfig" 152source "fs/udf/Kconfig" 153 154endmenu 155endif # BLOCK 156 157if BLOCK 158menu "DOS/FAT/EXFAT/NT Filesystems" 159 160source "fs/fat/Kconfig" 161source "fs/exfat/Kconfig" 162source "fs/ntfs/Kconfig" 163source "fs/ntfs3/Kconfig" 164 165endmenu 166endif # BLOCK 167 168menu "Pseudo filesystems" 169 170source "fs/proc/Kconfig" 171source "fs/kernfs/Kconfig" 172source "fs/sysfs/Kconfig" 173 174config TMPFS 175 bool "Tmpfs virtual memory file system support (former shm fs)" 176 depends on SHMEM 177 select MEMFD_CREATE 178 help 179 Tmpfs is a file system which keeps all files in virtual memory. 180 181 Everything in tmpfs is temporary in the sense that no files will be 182 created on your hard drive. The files live in memory and swap 183 space. If you unmount a tmpfs instance, everything stored therein is 184 lost. 185 186 See <file:Documentation/filesystems/tmpfs.rst> for details. 187 188config TMPFS_POSIX_ACL 189 bool "Tmpfs POSIX Access Control Lists" 190 depends on TMPFS 191 select TMPFS_XATTR 192 select FS_POSIX_ACL 193 help 194 POSIX Access Control Lists (ACLs) support additional access rights 195 for users and groups beyond the standard owner/group/world scheme, 196 and this option selects support for ACLs specifically for tmpfs 197 filesystems. 198 199 If you've selected TMPFS, it's possible that you'll also need 200 this option as there are a number of Linux distros that require 201 POSIX ACL support under /dev for certain features to work properly. 202 For example, some distros need this feature for ALSA-related /dev 203 files for sound to work properly. In short, if you're not sure, 204 say Y. 205 206config TMPFS_XATTR 207 bool "Tmpfs extended attributes" 208 depends on TMPFS 209 default n 210 help 211 Extended attributes are name:value pairs associated with inodes by 212 the kernel or by users (see the attr(5) manual page for details). 213 214 This enables support for the trusted.*, security.* and user.* 215 namespaces. 216 217 You need this for POSIX ACL support on tmpfs. 218 219 If unsure, say N. 220 221config TMPFS_INODE64 222 bool "Use 64-bit ino_t by default in tmpfs" 223 depends on TMPFS && 64BIT 224 default n 225 help 226 tmpfs has historically used only inode numbers as wide as an unsigned 227 int. In some cases this can cause wraparound, potentially resulting 228 in multiple files with the same inode number on a single device. This 229 option makes tmpfs use the full width of ino_t by default, without 230 needing to specify the inode64 option when mounting. 231 232 But if a long-lived tmpfs is to be accessed by 32-bit applications so 233 ancient that opening a file larger than 2GiB fails with EINVAL, then 234 the INODE64 config option and inode64 mount option risk operations 235 failing with EOVERFLOW once 33-bit inode numbers are reached. 236 237 To override this configured default, use the inode32 or inode64 238 option when mounting. 239 240 If unsure, say N. 241 242config TMPFS_QUOTA 243 bool "Tmpfs quota support" 244 depends on TMPFS 245 select QUOTA 246 help 247 Quota support allows to set per user and group limits for tmpfs 248 usage. Say Y to enable quota support. Once enabled you can control 249 user and group quota enforcement with quota, usrquota and grpquota 250 mount options. 251 252 If unsure, say N. 253 254config ARCH_SUPPORTS_HUGETLBFS 255 def_bool n 256 257config HUGETLBFS 258 bool "HugeTLB file system support" 259 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 260 depends on (SYSFS || SYSCTL) 261 select MEMFD_CREATE 262 help 263 hugetlbfs is a filesystem backing for HugeTLB pages, based on 264 ramfs. For architectures that support it, say Y here and read 265 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 266 267 If unsure, say N. 268 269config HUGETLB_PAGE 270 def_bool HUGETLBFS 271 272config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 273 def_bool HUGETLB_PAGE 274 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 275 depends on SPARSEMEM_VMEMMAP 276 277config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 278 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 279 default n 280 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 281 help 282 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to 283 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 284 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 285 286config ARCH_HAS_GIGANTIC_PAGE 287 bool 288 289source "fs/configfs/Kconfig" 290source "fs/efivarfs/Kconfig" 291 292endmenu 293 294menuconfig MISC_FILESYSTEMS 295 bool "Miscellaneous filesystems" 296 default y 297 help 298 Say Y here to get to see options for various miscellaneous 299 filesystems, such as filesystems that came from other 300 operating systems. 301 302 This option alone does not add any kernel code. 303 304 If you say N, all options in this submenu will be skipped and 305 disabled; if unsure, say Y here. 306 307if MISC_FILESYSTEMS 308 309source "fs/orangefs/Kconfig" 310source "fs/adfs/Kconfig" 311source "fs/affs/Kconfig" 312source "fs/ecryptfs/Kconfig" 313source "fs/hfs/Kconfig" 314source "fs/hfsplus/Kconfig" 315source "fs/befs/Kconfig" 316source "fs/bfs/Kconfig" 317source "fs/efs/Kconfig" 318source "fs/jffs2/Kconfig" 319# UBIFS File system configuration 320source "fs/ubifs/Kconfig" 321source "fs/cramfs/Kconfig" 322source "fs/squashfs/Kconfig" 323source "fs/freevxfs/Kconfig" 324source "fs/minix/Kconfig" 325source "fs/omfs/Kconfig" 326source "fs/hpfs/Kconfig" 327source "fs/qnx4/Kconfig" 328source "fs/qnx6/Kconfig" 329source "fs/romfs/Kconfig" 330source "fs/pstore/Kconfig" 331source "fs/sysv/Kconfig" 332source "fs/ufs/Kconfig" 333source "fs/erofs/Kconfig" 334source "fs/vboxsf/Kconfig" 335 336endif # MISC_FILESYSTEMS 337 338menuconfig NETWORK_FILESYSTEMS 339 bool "Network File Systems" 340 default y 341 depends on NET 342 help 343 Say Y here to get to see options for network filesystems and 344 filesystem-related networking code, such as NFS daemon and 345 RPCSEC security modules. 346 347 This option alone does not add any kernel code. 348 349 If you say N, all options in this submenu will be skipped and 350 disabled; if unsure, say Y here. 351 352if NETWORK_FILESYSTEMS 353 354source "fs/nfs/Kconfig" 355source "fs/nfsd/Kconfig" 356 357config GRACE_PERIOD 358 tristate 359 360config LOCKD 361 tristate 362 depends on FILE_LOCKING 363 select GRACE_PERIOD 364 365config LOCKD_V4 366 bool 367 depends on NFSD || NFS_V3 368 depends on FILE_LOCKING 369 default y 370 371config NFS_ACL_SUPPORT 372 tristate 373 select FS_POSIX_ACL 374 375config NFS_COMMON 376 bool 377 depends on NFSD || NFS_FS || LOCKD 378 default y 379 380config NFS_V4_2_SSC_HELPER 381 bool 382 default y if NFS_V4_2 383 384source "net/sunrpc/Kconfig" 385source "fs/ceph/Kconfig" 386 387source "fs/smb/Kconfig" 388source "fs/coda/Kconfig" 389source "fs/afs/Kconfig" 390source "fs/9p/Kconfig" 391 392endif # NETWORK_FILESYSTEMS 393 394source "fs/nls/Kconfig" 395source "fs/dlm/Kconfig" 396source "fs/unicode/Kconfig" 397 398config IO_WQ 399 bool 400 401endmenu 402