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 # Stackable filesystems
  22 config FS_STACK
  23         bool
  24
  25 config BUFFER_HEAD
  26         bool
  27
  28 # old blockdev_direct_IO implementation.  Use iomap for new code instead
  29 config LEGACY_DIRECT_IO
  30         depends on BUFFER_HEAD
  31         bool
  32
  33 if BLOCK
  34
  35 source "fs/ext2/Kconfig"
  36 source "fs/ext4/Kconfig"
  37 source "fs/jbd2/Kconfig"
  38
  39 config FS_MBCACHE
  40 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
  41         tristate
  42         default y if EXT2_FS=y && EXT2_FS_XATTR
  43         default y if EXT4_FS=y
  44         default m if EXT2_FS_XATTR || EXT4_FS
  45
  46 source "fs/reiserfs/Kconfig"
  47 source "fs/jfs/Kconfig"
  48
  49 source "fs/xfs/Kconfig"
  50 source "fs/gfs2/Kconfig"
  51 source "fs/ocfs2/Kconfig"
  52 source "fs/btrfs/Kconfig"
  53 source "fs/nilfs2/Kconfig"
  54 source "fs/f2fs/Kconfig"
  55 source "fs/bcachefs/Kconfig"
  56 source "fs/zonefs/Kconfig"
  57
  58 endif # BLOCK
  59
  60 config FS_DAX
  61         bool "File system based Direct Access (DAX) support"
  62         depends on MMU
  63         depends on !(ARM || MIPS || SPARC)
  64         depends on ZONE_DEVICE || FS_DAX_LIMITED
  65         select FS_IOMAP
  66         select DAX
  67         help
  68           Direct Access (DAX) can be used on memory-backed block devices.
  69           If the block device supports DAX and the filesystem supports DAX,
  70           then you can avoid using the pagecache to buffer I/Os.  Turning
  71           on this option will compile in support for DAX.
  72
  73           For a DAX device to support file system access it needs to have
  74           struct pages.  For the nfit based NVDIMMs this can be enabled
  75           using the ndctl utility:
  76
  77                 # ndctl create-namespace --force --reconfig=namespace0.0 \
  78                         --mode=fsdax --map=mem
  79
  80           See the 'create-namespace' man page for details on the overhead of
  81           --map=mem:
  82           https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
  83
  84           For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
  85           file systems DAX support needs to be manually enabled globally or
  86           per-inode using a mount option as well.  See the file documentation in
  87           Documentation/filesystems/dax.rst for details.
  88
  89           If you do not have a block device that is capable of using this,
  90           or if unsure, say N.  Saying Y will increase the size of the kernel
  91           by about 5kB.
  92
  93 config FS_DAX_PMD
  94         bool
  95         default FS_DAX
  96         depends on FS_DAX
  97         depends on ZONE_DEVICE
  98         depends on TRANSPARENT_HUGEPAGE
  99
 100 # Selected by DAX drivers that do not expect filesystem DAX to support
 101 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
 102 # for fork() of processes with MAP_SHARED mappings or support for
 103 # direct-I/O to a DAX mapping.
 104 config FS_DAX_LIMITED
 105         bool
 106
 107 # Posix ACL utility routines
 108 #
 109 # Note: Posix ACLs can be implemented without these helpers.  Never use
 110 # this symbol for ifdefs in core code.
 111 #
 112 config FS_POSIX_ACL
 113         def_bool n
 114
 115 config EXPORTFS
 116         tristate
 117
 118 config EXPORTFS_BLOCK_OPS
 119         bool "Enable filesystem export operations for block IO"
 120         help
 121           This option enables the export operations for a filesystem to support
 122           external block IO.
 123
 124 config FILE_LOCKING
 125         bool "Enable POSIX file locking API" if EXPERT
 126         default y
 127         help
 128           This option enables standard file locking support, required
 129           for filesystems like NFS and for the flock() system
 130           call. Disabling this option saves about 11k.
 131
 132 source "fs/crypto/Kconfig"
 133
 134 source "fs/verity/Kconfig"
 135
 136 source "fs/notify/Kconfig"
 137
 138 source "fs/quota/Kconfig"
 139
 140 source "fs/autofs/Kconfig"
 141 source "fs/fuse/Kconfig"
 142 source "fs/overlayfs/Kconfig"
 143
 144 menu "Caches"
 145
 146 source "fs/netfs/Kconfig"
 147 source "fs/cachefiles/Kconfig"
 148
 149 endmenu
 150
 151 if BLOCK
 152 menu "CD-ROM/DVD Filesystems"
 153
 154 source "fs/isofs/Kconfig"
 155 source "fs/udf/Kconfig"
 156
 157 endmenu
 158 endif # BLOCK
 159
 160 if BLOCK
 161 menu "DOS/FAT/EXFAT/NT Filesystems"
 162
 163 source "fs/fat/Kconfig"
 164 source "fs/exfat/Kconfig"
 165 source "fs/ntfs/Kconfig"
 166 source "fs/ntfs3/Kconfig"
 167
 168 endmenu
 169 endif # BLOCK
 170
 171 menu "Pseudo filesystems"
 172
 173 source "fs/proc/Kconfig"
 174 source "fs/kernfs/Kconfig"
 175 source "fs/sysfs/Kconfig"
 176
 177 config TMPFS
 178         bool "Tmpfs virtual memory file system support (former shm fs)"
 179         depends on SHMEM
 180         select MEMFD_CREATE
 181         help
 182           Tmpfs is a file system which keeps all files in virtual memory.
 183
 184           Everything in tmpfs is temporary in the sense that no files will be
 185           created on your hard drive. The files live in memory and swap
 186           space. If you unmount a tmpfs instance, everything stored therein is
 187           lost.
 188
 189           See <file:Documentation/filesystems/tmpfs.rst> for details.
 190
 191 config TMPFS_POSIX_ACL
 192         bool "Tmpfs POSIX Access Control Lists"
 193         depends on TMPFS
 194         select TMPFS_XATTR
 195         select FS_POSIX_ACL
 196         help
 197           POSIX Access Control Lists (ACLs) support additional access rights
 198           for users and groups beyond the standard owner/group/world scheme,
 199           and this option selects support for ACLs specifically for tmpfs
 200           filesystems.
 201
 202           If you've selected TMPFS, it's possible that you'll also need
 203           this option as there are a number of Linux distros that require
 204           POSIX ACL support under /dev for certain features to work properly.
 205           For example, some distros need this feature for ALSA-related /dev
 206           files for sound to work properly.  In short, if you're not sure,
 207           say Y.
 208
 209 config TMPFS_XATTR
 210         bool "Tmpfs extended attributes"
 211         depends on TMPFS
 212         default n
 213         help
 214           Extended attributes are name:value pairs associated with inodes by
 215           the kernel or by users (see the attr(5) manual page for details).
 216
 217           This enables support for the trusted.*, security.* and user.*
 218           namespaces.
 219
 220           You need this for POSIX ACL support on tmpfs.
 221
 222           If unsure, say N.
 223
 224 config TMPFS_INODE64
 225         bool "Use 64-bit ino_t by default in tmpfs"
 226         depends on TMPFS && 64BIT
 227         default n
 228         help
 229           tmpfs has historically used only inode numbers as wide as an unsigned
 230           int. In some cases this can cause wraparound, potentially resulting
 231           in multiple files with the same inode number on a single device. This
 232           option makes tmpfs use the full width of ino_t by default, without
 233           needing to specify the inode64 option when mounting.
 234
 235           But if a long-lived tmpfs is to be accessed by 32-bit applications so
 236           ancient that opening a file larger than 2GiB fails with EINVAL, then
 237           the INODE64 config option and inode64 mount option risk operations
 238           failing with EOVERFLOW once 33-bit inode numbers are reached.
 239
 240           To override this configured default, use the inode32 or inode64
 241           option when mounting.
 242
 243           If unsure, say N.
 244
 245 config TMPFS_QUOTA
 246         bool "Tmpfs quota support"
 247         depends on TMPFS
 248         select QUOTA
 249         help
 250           Quota support allows to set per user and group limits for tmpfs
 251           usage.  Say Y to enable quota support. Once enabled you can control
 252           user and group quota enforcement with quota, usrquota and grpquota
 253           mount options.
 254
 255           If unsure, say N.
 256
 257 config ARCH_SUPPORTS_HUGETLBFS
 258         def_bool n
 259
 260 menuconfig HUGETLBFS
 261         bool "HugeTLB file system support"
 262         depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
 263         depends on (SYSFS || SYSCTL)
 264         select MEMFD_CREATE
 265         help
 266           hugetlbfs is a filesystem backing for HugeTLB pages, based on
 267           ramfs. For architectures that support it, say Y here and read
 268           <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
 269
 270           If unsure, say N.
 271
 272 if HUGETLBFS
 273 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
 274         bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
 275         default n
 276         depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
 277         help
 278           The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
 279           enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
 280           (boot command line) or hugetlb_optimize_vmemmap (sysctl).
 281 endif # HUGETLBFS
 282
 283 config HUGETLB_PAGE
 284         def_bool HUGETLBFS
 285         select XARRAY_MULTI
 286
 287 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
 288         def_bool HUGETLB_PAGE
 289         depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
 290         depends on SPARSEMEM_VMEMMAP
 291
 292 config ARCH_HAS_GIGANTIC_PAGE
 293         bool
 294
 295 source "fs/configfs/Kconfig"
 296 source "fs/efivarfs/Kconfig"
 297
 298 endmenu
 299
 300 menuconfig MISC_FILESYSTEMS
 301         bool "Miscellaneous filesystems"
 302         default y
 303         help
 304           Say Y here to get to see options for various miscellaneous
 305           filesystems, such as filesystems that came from other
 306           operating systems.
 307
 308           This option alone does not add any kernel code.
 309
 310           If you say N, all options in this submenu will be skipped and
 311           disabled; if unsure, say Y here.
 312
 313 if MISC_FILESYSTEMS
 314
 315 source "fs/orangefs/Kconfig"
 316 source "fs/adfs/Kconfig"
 317 source "fs/affs/Kconfig"
 318 source "fs/ecryptfs/Kconfig"
 319 source "fs/hfs/Kconfig"
 320 source "fs/hfsplus/Kconfig"
 321 source "fs/befs/Kconfig"
 322 source "fs/bfs/Kconfig"
 323 source "fs/efs/Kconfig"
 324 source "fs/jffs2/Kconfig"
 325 # UBIFS File system configuration
 326 source "fs/ubifs/Kconfig"
 327 source "fs/cramfs/Kconfig"
 328 source "fs/squashfs/Kconfig"
 329 source "fs/freevxfs/Kconfig"
 330 source "fs/minix/Kconfig"
 331 source "fs/omfs/Kconfig"
 332 source "fs/hpfs/Kconfig"
 333 source "fs/qnx4/Kconfig"
 334 source "fs/qnx6/Kconfig"
 335 source "fs/romfs/Kconfig"
 336 source "fs/pstore/Kconfig"
 337 source "fs/sysv/Kconfig"
 338 source "fs/ufs/Kconfig"
 339 source "fs/erofs/Kconfig"
 340 source "fs/vboxsf/Kconfig"
 341
 342 endif # MISC_FILESYSTEMS
 343
 344 menuconfig NETWORK_FILESYSTEMS
 345         bool "Network File Systems"
 346         default y
 347         depends on NET
 348         help
 349           Say Y here to get to see options for network filesystems and
 350           filesystem-related networking code, such as NFS daemon and
 351           RPCSEC security modules.
 352
 353           This option alone does not add any kernel code.
 354
 355           If you say N, all options in this submenu will be skipped and
 356           disabled; if unsure, say Y here.
 357
 358 if NETWORK_FILESYSTEMS
 359
 360 source "fs/nfs/Kconfig"
 361 source "fs/nfsd/Kconfig"
 362
 363 config GRACE_PERIOD
 364         tristate
 365
 366 config LOCKD
 367         tristate
 368         depends on FILE_LOCKING
 369         select GRACE_PERIOD
 370
 371 config LOCKD_V4
 372         bool
 373         depends on NFSD || NFS_V3
 374         depends on FILE_LOCKING
 375         default y
 376
 377 config NFS_ACL_SUPPORT
 378         tristate
 379         select FS_POSIX_ACL
 380
 381 config NFS_COMMON
 382         bool
 383         depends on NFSD || NFS_FS || LOCKD
 384         default y
 385
 386 config NFS_V4_2_SSC_HELPER
 387         bool
 388         default y if NFS_V4_2
 389
 390 source "net/sunrpc/Kconfig"
 391 source "fs/ceph/Kconfig"
 392
 393 source "fs/smb/Kconfig"
 394 source "fs/coda/Kconfig"
 395 source "fs/afs/Kconfig"
 396 source "fs/9p/Kconfig"
 397
 398 endif # NETWORK_FILESYSTEMS
 399
 400 source "fs/nls/Kconfig"
 401 source "fs/dlm/Kconfig"
 402 source "fs/unicode/Kconfig"
 403
 404 config IO_WQ
 405         bool
 406
 407 endmenu