fs/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # File system configuration
   4 #
   5
   6 menu "File systems"
   7
   8 # Use unaligned word dcache accesses
   9 config DCACHE_WORD_ACCESS
  10        bool
  11
  12 config 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
  18 config FS_IOMAP
  19         bool
  20
  21 config BUFFER_HEAD
  22         bool
  23
  24 # old blockdev_direct_IO implementation.  Use iomap for new code instead
  25 config LEGACY_DIRECT_IO
  26         depends on BUFFER_HEAD
  27         bool
  28
  29 if BLOCK
  30
  31 source "fs/ext2/Kconfig"
  32 source "fs/ext4/Kconfig"
  33 source "fs/jbd2/Kconfig"
  34
  35 config 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
  42 source "fs/reiserfs/Kconfig"
  43 source "fs/jfs/Kconfig"
  44
  45 source "fs/xfs/Kconfig"
  46 source "fs/gfs2/Kconfig"
  47 source "fs/ocfs2/Kconfig"
  48 source "fs/btrfs/Kconfig"
  49 source "fs/nilfs2/Kconfig"
  50 source "fs/f2fs/Kconfig"
  51 source "fs/bcachefs/Kconfig"
  52 source "fs/zonefs/Kconfig"
  53
  54 endif # BLOCK
  55
  56 config 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
  89 config 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.
 100 config 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 #
 108 config FS_POSIX_ACL
 109         def_bool n
 110
 111 config EXPORTFS
 112         tristate
 113
 114 config 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
 120 config 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
 128 source "fs/crypto/Kconfig"
 129
 130 source "fs/verity/Kconfig"
 131
 132 source "fs/notify/Kconfig"
 133
 134 source "fs/quota/Kconfig"
 135
 136 source "fs/autofs/Kconfig"
 137 source "fs/fuse/Kconfig"
 138 source "fs/overlayfs/Kconfig"
 139
 140 menu "Caches"
 141
 142 source "fs/netfs/Kconfig"
 143 source "fs/cachefiles/Kconfig"
 144
 145 endmenu
 146
 147 if BLOCK
 148 menu "CD-ROM/DVD Filesystems"
 149
 150 source "fs/isofs/Kconfig"
 151 source "fs/udf/Kconfig"
 152
 153 endmenu
 154 endif # BLOCK
 155
 156 if BLOCK
 157 menu "DOS/FAT/EXFAT/NT Filesystems"
 158
 159 source "fs/fat/Kconfig"
 160 source "fs/exfat/Kconfig"
 161 source "fs/ntfs/Kconfig"
 162 source "fs/ntfs3/Kconfig"
 163
 164 endmenu
 165 endif # BLOCK
 166
 167 menu "Pseudo filesystems"
 168
 169 source "fs/proc/Kconfig"
 170 source "fs/kernfs/Kconfig"
 171 source "fs/sysfs/Kconfig"
 172
 173 config 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
 187 config 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
 205 config 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
 220 config 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
 241 config 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
 253 config ARCH_SUPPORTS_HUGETLBFS
 254         def_bool n
 255
 256 config 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
 268 config HUGETLB_PAGE
 269         def_bool HUGETLBFS
 270         select XARRAY_MULTI
 271
 272 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
 273         def_bool HUGETLB_PAGE
 274         depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
 275         depends on SPARSEMEM_VMEMMAP
 276
 277 config 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
 286 config ARCH_HAS_GIGANTIC_PAGE
 287         bool
 288
 289 source "fs/configfs/Kconfig"
 290 source "fs/efivarfs/Kconfig"
 291
 292 endmenu
 293
 294 menuconfig 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
 307 if MISC_FILESYSTEMS
 308
 309 source "fs/orangefs/Kconfig"
 310 source "fs/adfs/Kconfig"
 311 source "fs/affs/Kconfig"
 312 source "fs/ecryptfs/Kconfig"
 313 source "fs/hfs/Kconfig"
 314 source "fs/hfsplus/Kconfig"
 315 source "fs/befs/Kconfig"
 316 source "fs/bfs/Kconfig"
 317 source "fs/efs/Kconfig"
 318 source "fs/jffs2/Kconfig"
 319 # UBIFS File system configuration
 320 source "fs/ubifs/Kconfig"
 321 source "fs/cramfs/Kconfig"
 322 source "fs/squashfs/Kconfig"
 323 source "fs/freevxfs/Kconfig"
 324 source "fs/minix/Kconfig"
 325 source "fs/omfs/Kconfig"
 326 source "fs/hpfs/Kconfig"
 327 source "fs/qnx4/Kconfig"
 328 source "fs/qnx6/Kconfig"
 329 source "fs/romfs/Kconfig"
 330 source "fs/pstore/Kconfig"
 331 source "fs/sysv/Kconfig"
 332 source "fs/ufs/Kconfig"
 333 source "fs/erofs/Kconfig"
 334 source "fs/vboxsf/Kconfig"
 335
 336 endif # MISC_FILESYSTEMS
 337
 338 menuconfig 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
 352 if NETWORK_FILESYSTEMS
 353
 354 source "fs/nfs/Kconfig"
 355 source "fs/nfsd/Kconfig"
 356
 357 config GRACE_PERIOD
 358         tristate
 359
 360 config LOCKD
 361         tristate
 362         depends on FILE_LOCKING
 363         select GRACE_PERIOD
 364
 365 config LOCKD_V4
 366         bool
 367         depends on NFSD || NFS_V3
 368         depends on FILE_LOCKING
 369         default y
 370
 371 config NFS_ACL_SUPPORT
 372         tristate
 373         select FS_POSIX_ACL
 374
 375 config NFS_COMMON
 376         bool
 377         depends on NFSD || NFS_FS || LOCKD
 378         default y
 379
 380 config NFS_V4_2_SSC_HELPER
 381         bool
 382         default y if NFS_V4_2
 383
 384 source "net/sunrpc/Kconfig"
 385 source "fs/ceph/Kconfig"
 386
 387 source "fs/smb/Kconfig"
 388 source "fs/coda/Kconfig"
 389 source "fs/afs/Kconfig"
 390 source "fs/9p/Kconfig"
 391
 392 endif # NETWORK_FILESYSTEMS
 393
 394 source "fs/nls/Kconfig"
 395 source "fs/dlm/Kconfig"
 396 source "fs/unicode/Kconfig"
 397
 398 config IO_WQ
 399         bool
 400
 401 endmenu