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/zonefs/Kconfig" 52 53endif # BLOCK 54 55config FS_DAX 56 bool "File system based Direct Access (DAX) support" 57 depends on MMU 58 depends on !(ARM || MIPS || SPARC) 59 depends on ZONE_DEVICE || FS_DAX_LIMITED 60 select FS_IOMAP 61 select DAX 62 help 63 Direct Access (DAX) can be used on memory-backed block devices. 64 If the block device supports DAX and the filesystem supports DAX, 65 then you can avoid using the pagecache to buffer I/Os. Turning 66 on this option will compile in support for DAX. 67 68 For a DAX device to support file system access it needs to have 69 struct pages. For the nfit based NVDIMMs this can be enabled 70 using the ndctl utility: 71 72 # ndctl create-namespace --force --reconfig=namespace0.0 \ 73 --mode=fsdax --map=mem 74 75 See the 'create-namespace' man page for details on the overhead of 76 --map=mem: 77 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace 78 79 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most 80 file systems DAX support needs to be manually enabled globally or 81 per-inode using a mount option as well. See the file documentation in 82 Documentation/filesystems/dax.rst for details. 83 84 If you do not have a block device that is capable of using this, 85 or if unsure, say N. Saying Y will increase the size of the kernel 86 by about 5kB. 87 88config FS_DAX_PMD 89 bool 90 default FS_DAX 91 depends on FS_DAX 92 depends on ZONE_DEVICE 93 depends on TRANSPARENT_HUGEPAGE 94 95# Selected by DAX drivers that do not expect filesystem DAX to support 96# get_user_pages() of DAX mappings. I.e. "limited" indicates no support 97# for fork() of processes with MAP_SHARED mappings or support for 98# direct-I/O to a DAX mapping. 99config FS_DAX_LIMITED 100 bool 101 102# Posix ACL utility routines 103# 104# Note: Posix ACLs can be implemented without these helpers. Never use 105# this symbol for ifdefs in core code. 106# 107config FS_POSIX_ACL 108 def_bool n 109 110config EXPORTFS 111 tristate 112 113config EXPORTFS_BLOCK_OPS 114 bool "Enable filesystem export operations for block IO" 115 help 116 This option enables the export operations for a filesystem to support 117 external block IO. 118 119config FILE_LOCKING 120 bool "Enable POSIX file locking API" if EXPERT 121 default y 122 help 123 This option enables standard file locking support, required 124 for filesystems like NFS and for the flock() system 125 call. Disabling this option saves about 11k. 126 127source "fs/crypto/Kconfig" 128 129source "fs/verity/Kconfig" 130 131source "fs/notify/Kconfig" 132 133source "fs/quota/Kconfig" 134 135source "fs/autofs/Kconfig" 136source "fs/fuse/Kconfig" 137source "fs/overlayfs/Kconfig" 138 139menu "Caches" 140 141source "fs/netfs/Kconfig" 142source "fs/fscache/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 help 177 Tmpfs is a file system which keeps all files in virtual memory. 178 179 Everything in tmpfs is temporary in the sense that no files will be 180 created on your hard drive. The files live in memory and swap 181 space. If you unmount a tmpfs instance, everything stored therein is 182 lost. 183 184 See <file:Documentation/filesystems/tmpfs.rst> for details. 185 186config TMPFS_POSIX_ACL 187 bool "Tmpfs POSIX Access Control Lists" 188 depends on TMPFS 189 select TMPFS_XATTR 190 select FS_POSIX_ACL 191 help 192 POSIX Access Control Lists (ACLs) support additional access rights 193 for users and groups beyond the standard owner/group/world scheme, 194 and this option selects support for ACLs specifically for tmpfs 195 filesystems. 196 197 If you've selected TMPFS, it's possible that you'll also need 198 this option as there are a number of Linux distros that require 199 POSIX ACL support under /dev for certain features to work properly. 200 For example, some distros need this feature for ALSA-related /dev 201 files for sound to work properly. In short, if you're not sure, 202 say Y. 203 204config TMPFS_XATTR 205 bool "Tmpfs extended attributes" 206 depends on TMPFS 207 default n 208 help 209 Extended attributes are name:value pairs associated with inodes by 210 the kernel or by users (see the attr(5) manual page for details). 211 212 Currently this enables support for the trusted.* and 213 security.* namespaces. 214 215 You need this for POSIX ACL support on tmpfs. 216 217 If unsure, say N. 218 219config TMPFS_INODE64 220 bool "Use 64-bit ino_t by default in tmpfs" 221 depends on TMPFS && 64BIT 222 default n 223 help 224 tmpfs has historically used only inode numbers as wide as an unsigned 225 int. In some cases this can cause wraparound, potentially resulting 226 in multiple files with the same inode number on a single device. This 227 option makes tmpfs use the full width of ino_t by default, without 228 needing to specify the inode64 option when mounting. 229 230 But if a long-lived tmpfs is to be accessed by 32-bit applications so 231 ancient that opening a file larger than 2GiB fails with EINVAL, then 232 the INODE64 config option and inode64 mount option risk operations 233 failing with EOVERFLOW once 33-bit inode numbers are reached. 234 235 To override this configured default, use the inode32 or inode64 236 option when mounting. 237 238 If unsure, say N. 239 240config ARCH_SUPPORTS_HUGETLBFS 241 def_bool n 242 243config HUGETLBFS 244 bool "HugeTLB file system support" 245 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN 246 depends on (SYSFS || SYSCTL) 247 help 248 hugetlbfs is a filesystem backing for HugeTLB pages, based on 249 ramfs. For architectures that support it, say Y here and read 250 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details. 251 252 If unsure, say N. 253 254config HUGETLB_PAGE 255 def_bool HUGETLBFS 256 257config HUGETLB_PAGE_OPTIMIZE_VMEMMAP 258 def_bool HUGETLB_PAGE 259 depends on ARCH_WANT_OPTIMIZE_VMEMMAP 260 depends on SPARSEMEM_VMEMMAP 261 262config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON 263 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" 264 default n 265 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP 266 help 267 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to 268 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off 269 (boot command line) or hugetlb_optimize_vmemmap (sysctl). 270 271config MEMFD_CREATE 272 def_bool TMPFS || HUGETLBFS 273 274config ARCH_HAS_GIGANTIC_PAGE 275 bool 276 277source "fs/configfs/Kconfig" 278source "fs/efivarfs/Kconfig" 279 280endmenu 281 282menuconfig MISC_FILESYSTEMS 283 bool "Miscellaneous filesystems" 284 default y 285 help 286 Say Y here to get to see options for various miscellaneous 287 filesystems, such as filesystems that came from other 288 operating systems. 289 290 This option alone does not add any kernel code. 291 292 If you say N, all options in this submenu will be skipped and 293 disabled; if unsure, say Y here. 294 295if MISC_FILESYSTEMS 296 297source "fs/orangefs/Kconfig" 298source "fs/adfs/Kconfig" 299source "fs/affs/Kconfig" 300source "fs/ecryptfs/Kconfig" 301source "fs/hfs/Kconfig" 302source "fs/hfsplus/Kconfig" 303source "fs/befs/Kconfig" 304source "fs/bfs/Kconfig" 305source "fs/efs/Kconfig" 306source "fs/jffs2/Kconfig" 307# UBIFS File system configuration 308source "fs/ubifs/Kconfig" 309source "fs/cramfs/Kconfig" 310source "fs/squashfs/Kconfig" 311source "fs/freevxfs/Kconfig" 312source "fs/minix/Kconfig" 313source "fs/omfs/Kconfig" 314source "fs/hpfs/Kconfig" 315source "fs/qnx4/Kconfig" 316source "fs/qnx6/Kconfig" 317source "fs/romfs/Kconfig" 318source "fs/pstore/Kconfig" 319source "fs/sysv/Kconfig" 320source "fs/ufs/Kconfig" 321source "fs/erofs/Kconfig" 322source "fs/vboxsf/Kconfig" 323 324endif # MISC_FILESYSTEMS 325 326menuconfig NETWORK_FILESYSTEMS 327 bool "Network File Systems" 328 default y 329 depends on NET 330 help 331 Say Y here to get to see options for network filesystems and 332 filesystem-related networking code, such as NFS daemon and 333 RPCSEC security modules. 334 335 This option alone does not add any kernel code. 336 337 If you say N, all options in this submenu will be skipped and 338 disabled; if unsure, say Y here. 339 340if NETWORK_FILESYSTEMS 341 342source "fs/nfs/Kconfig" 343source "fs/nfsd/Kconfig" 344 345config GRACE_PERIOD 346 tristate 347 348config LOCKD 349 tristate 350 depends on FILE_LOCKING 351 select GRACE_PERIOD 352 353config LOCKD_V4 354 bool 355 depends on NFSD || NFS_V3 356 depends on FILE_LOCKING 357 default y 358 359config NFS_ACL_SUPPORT 360 tristate 361 select FS_POSIX_ACL 362 363config NFS_COMMON 364 bool 365 depends on NFSD || NFS_FS || LOCKD 366 default y 367 368config NFS_V4_2_SSC_HELPER 369 bool 370 default y if NFS_V4_2 371 372source "net/sunrpc/Kconfig" 373source "fs/ceph/Kconfig" 374 375source "fs/smb/Kconfig" 376source "fs/coda/Kconfig" 377source "fs/afs/Kconfig" 378source "fs/9p/Kconfig" 379 380endif # NETWORK_FILESYSTEMS 381 382source "fs/nls/Kconfig" 383source "fs/dlm/Kconfig" 384source "fs/unicode/Kconfig" 385 386config IO_WQ 387 bool 388 389endmenu 390