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/cachefiles/Kconfig" 144 145endmenu 146 147if BLOCK 148menu "CD-ROM/DVD Filesystems" 149 150source "fs/isofs/Kconfig" 151source "fs/udf/Kconfig" 152 153endmenu 154endif # BLOCK 155 156if BLOCK 157menu "DOS/FAT/EXFAT/NT Filesystems" 158 159source "fs/fat/Kconfig" 160source "fs/exfat/Kconfig" 161source "fs/ntfs/Kconfig" 162source "fs/ntfs3/Kconfig" 163 164endmenu 165endif # BLOCK 166 167menu "Pseudo filesystems" 168 169source "fs/proc/Kconfig" 170source "fs/kernfs/Kconfig" 171source "fs/sysfs/Kconfig" 172 173config TMPFS 174 bool "Tmpfs virtual memory file system support (former shm fs)" 175 depends on SHMEM 176 select MEMFD_CREATE 177 help 178 Tmpfs is a file system which keeps all files in virtual memory. 179 180 Everything in tmpfs is temporary in the sense that no files will be 181 created on your hard drive. The files live in memory and swap 182 space. If you unmount a tmpfs instance, everything stored therein is 183 lost. 184 185 See <file:Documentation/filesystems/tmpfs.rst> for details. 186 187config TMPFS_POSIX_ACL 188 bool "Tmpfs POSIX Access Control Lists" 189 depends on TMPFS 190 select TMPFS_XATTR 191 select FS_POSIX_ACL 192 help 193 POSIX Access Control Lists (ACLs) support additional access rights 194 for users and groups beyond the standard owner/group/world scheme, 195 and this option selects support for ACLs specifically for tmpfs 196 filesystems. 197 198 If you've selected TMPFS, it's possible that you'll also need 199 this option as there are a number of Linux distros that require 200 POSIX ACL support under /dev for certain features to work properly. 201 For example, some distros need this feature for ALSA-related /dev 202 files for sound to work properly. In short, if you're not sure, 203 say Y. 204 205config TMPFS_XATTR 206 bool "Tmpfs extended attributes" 207 depends on TMPFS 208 default n 209 help 210 Extended attributes are name:value pairs associated with inodes by 211 the kernel or by users (see the attr(5) manual page for details). 212 213 This enables support for the trusted.*, security.* and user.* 214 namespaces. 215 216 You need this for POSIX ACL support on tmpfs. 217 218 If unsure, say N. 219 220config TMPFS_INODE64 221 bool "Use 64-bit ino_t by default in tmpfs" 222 depends on TMPFS && 64BIT 223 default n 224 help 225 tmpfs has historically used only inode numbers as wide as an unsigned 226 int. In some cases this can cause wraparound, potentially resulting 227 in multiple files with the same inode number on a single device. This 228 option makes tmpfs use the full width of ino_t by default, without 229 needing to specify the inode64 option when mounting. 230 231 But if a long-lived tmpfs is to be accessed by 32-bit applications so 232 ancient that opening a file larger than 2GiB fails with EINVAL, then 233 the INODE64 config option and inode64 mount option risk operations 234 failing with EOVERFLOW once 33-bit inode numbers are reached. 235 236 To override this configured default, use the inode32 or inode64 237 option when mounting. 238 239 If unsure, say N. 240 241config TMPFS_QUOTA 242 bool "Tmpfs quota support" 243 depends on TMPFS 244 select QUOTA 245 help 246 Quota support allows to set per user and group limits for tmpfs 247 usage. Say Y to enable quota support. Once enabled you can control 248 user and group quota enforcement with quota, usrquota and grpquota 249 mount options. 250 251 If unsure, say N. 252 253config ARCH_SUPPORTS_HUGETLBFS 254 def_bool n 255 256config HUGETLBFS 257 bool "HugeTLB file system support" 258 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 259 depends on (SYSFS || SYSCTL) 260 select MEMFD_CREATE 261 help 262 hugetlbfs is a filesystem backing for HugeTLB pages, based on 263 ramfs. For architectures that support it, say Y here and read 264 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 265 266 If unsure, say N. 267 268config HUGETLB_PAGE 269 def_bool HUGETLBFS 270 select XARRAY_MULTI 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