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 if BLOCK
  19
  20 config FS_IOMAP
  21         bool
  22
  23 source "fs/ext2/Kconfig"
  24 source "fs/ext4/Kconfig"
  25 source "fs/jbd2/Kconfig"
  26
  27 config FS_MBCACHE
  28 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
  29         tristate
  30         default y if EXT2_FS=y && EXT2_FS_XATTR
  31         default y if EXT4_FS=y
  32         default m if EXT2_FS_XATTR || EXT4_FS
  33
  34 source "fs/reiserfs/Kconfig"
  35 source "fs/jfs/Kconfig"
  36
  37 source "fs/xfs/Kconfig"
  38 source "fs/gfs2/Kconfig"
  39 source "fs/ocfs2/Kconfig"
  40 source "fs/btrfs/Kconfig"
  41 source "fs/nilfs2/Kconfig"
  42 source "fs/f2fs/Kconfig"
  43 source "fs/zonefs/Kconfig"
  44
  45 config FS_DAX
  46         bool "File system based Direct Access (DAX) support"
  47         depends on MMU
  48         depends on !(ARM || MIPS || SPARC)
  49         select DEV_PAGEMAP_OPS if (ZONE_DEVICE && !FS_DAX_LIMITED)
  50         select FS_IOMAP
  51         select DAX
  52         help
  53           Direct Access (DAX) can be used on memory-backed block devices.
  54           If the block device supports DAX and the filesystem supports DAX,
  55           then you can avoid using the pagecache to buffer I/Os.  Turning
  56           on this option will compile in support for DAX.
  57
  58           For a DAX device to support file system access it needs to have
  59           struct pages.  For the nfit based NVDIMMs this can be enabled
  60           using the ndctl utility:
  61
  62                 # ndctl create-namespace --force --reconfig=namespace0.0 \
  63                         --mode=fsdax --map=mem
  64
  65           See the 'create-namespace' man page for details on the overhead of
  66           --map=mem:
  67           https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
  68
  69           For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
  70           file systems DAX support needs to be manually enabled globally or
  71           per-inode using a mount option as well.  See the file documentation in
  72           Documentation/filesystems/dax.rst for details.
  73
  74           If you do not have a block device that is capable of using this,
  75           or if unsure, say N.  Saying Y will increase the size of the kernel
  76           by about 5kB.
  77
  78 config FS_DAX_PMD
  79         bool
  80         default FS_DAX
  81         depends on FS_DAX
  82         depends on ZONE_DEVICE
  83         depends on TRANSPARENT_HUGEPAGE
  84
  85 # Selected by DAX drivers that do not expect filesystem DAX to support
  86 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
  87 # for fork() of processes with MAP_SHARED mappings or support for
  88 # direct-I/O to a DAX mapping.
  89 config FS_DAX_LIMITED
  90         bool
  91
  92 endif # BLOCK
  93
  94 # Posix ACL utility routines
  95 #
  96 # Note: Posix ACLs can be implemented without these helpers.  Never use
  97 # this symbol for ifdefs in core code.
  98 #
  99 config FS_POSIX_ACL
 100         def_bool n
 101
 102 config EXPORTFS
 103         tristate
 104
 105 config EXPORTFS_BLOCK_OPS
 106         bool "Enable filesystem export operations for block IO"
 107         help
 108           This option enables the export operations for a filesystem to support
 109           external block IO.
 110
 111 config FILE_LOCKING
 112         bool "Enable POSIX file locking API" if EXPERT
 113         default y
 114         help
 115           This option enables standard file locking support, required
 116           for filesystems like NFS and for the flock() system
 117           call. Disabling this option saves about 11k.
 118
 119 source "fs/crypto/Kconfig"
 120
 121 source "fs/verity/Kconfig"
 122
 123 source "fs/notify/Kconfig"
 124
 125 source "fs/quota/Kconfig"
 126
 127 source "fs/autofs/Kconfig"
 128 source "fs/fuse/Kconfig"
 129 source "fs/overlayfs/Kconfig"
 130
 131 config SHIFT_FS
 132         tristate "UID/GID shifting overlay filesystem for containers"
 133         help
 134           This filesystem can overlay any mounted filesystem and shift
 135           the uid/gid the files appear at.  The idea is that
 136           unprivileged containers can use this to mount root volumes
 137           using this technique.
 138
 139 config SHIFT_FS_POSIX_ACL
 140         bool "shiftfs POSIX Access Control Lists"
 141         depends on SHIFT_FS
 142         select FS_POSIX_ACL
 143         help
 144           POSIX Access Control Lists (ACLs) support permissions for users and
 145           groups beyond the owner/group/world scheme.
 146
 147           If you don't know what Access Control Lists are, say N.
 148
 149 menu "Caches"
 150
 151 source "fs/netfs/Kconfig"
 152 source "fs/fscache/Kconfig"
 153 source "fs/cachefiles/Kconfig"
 154
 155 endmenu
 156
 157 if BLOCK
 158 menu "CD-ROM/DVD Filesystems"
 159
 160 source "fs/isofs/Kconfig"
 161 source "fs/udf/Kconfig"
 162
 163 endmenu
 164 endif # BLOCK
 165
 166 if BLOCK
 167 menu "DOS/FAT/EXFAT/NT Filesystems"
 168
 169 source "fs/fat/Kconfig"
 170 source "fs/exfat/Kconfig"
 171 source "fs/ntfs/Kconfig"
 172 source "fs/ntfs3/Kconfig"
 173
 174 endmenu
 175 endif # BLOCK
 176
 177 menu "Pseudo filesystems"
 178
 179 source "fs/proc/Kconfig"
 180 source "fs/kernfs/Kconfig"
 181 source "fs/sysfs/Kconfig"
 182
 183 config TMPFS
 184         bool "Tmpfs virtual memory file system support (former shm fs)"
 185         depends on SHMEM
 186         help
 187           Tmpfs is a file system which keeps all files in virtual memory.
 188
 189           Everything in tmpfs is temporary in the sense that no files will be
 190           created on your hard drive. The files live in memory and swap
 191           space. If you unmount a tmpfs instance, everything stored therein is
 192           lost.
 193
 194           See <file:Documentation/filesystems/tmpfs.rst> for details.
 195
 196 config TMPFS_POSIX_ACL
 197         bool "Tmpfs POSIX Access Control Lists"
 198         depends on TMPFS
 199         select TMPFS_XATTR
 200         select FS_POSIX_ACL
 201         help
 202           POSIX Access Control Lists (ACLs) support additional access rights
 203           for users and groups beyond the standard owner/group/world scheme,
 204           and this option selects support for ACLs specifically for tmpfs
 205           filesystems.
 206
 207           If you've selected TMPFS, it's possible that you'll also need
 208           this option as there are a number of Linux distros that require
 209           POSIX ACL support under /dev for certain features to work properly.
 210           For example, some distros need this feature for ALSA-related /dev
 211           files for sound to work properly.  In short, if you're not sure,
 212           say Y.
 213
 214 config TMPFS_XATTR
 215         bool "Tmpfs extended attributes"
 216         depends on TMPFS
 217         default n
 218         help
 219           Extended attributes are name:value pairs associated with inodes by
 220           the kernel or by users (see the attr(5) manual page for details).
 221
 222           Currently this enables support for the trusted.* and
 223           security.* namespaces.
 224
 225           You need this for POSIX ACL support on tmpfs.
 226
 227           If unsure, say N.
 228
 229 config TMPFS_INODE64
 230         bool "Use 64-bit ino_t by default in tmpfs"
 231         depends on TMPFS && 64BIT
 232         default n
 233         help
 234           tmpfs has historically used only inode numbers as wide as an unsigned
 235           int. In some cases this can cause wraparound, potentially resulting
 236           in multiple files with the same inode number on a single device. This
 237           option makes tmpfs use the full width of ino_t by default, without
 238           needing to specify the inode64 option when mounting.
 239
 240           But if a long-lived tmpfs is to be accessed by 32-bit applications so
 241           ancient that opening a file larger than 2GiB fails with EINVAL, then
 242           the INODE64 config option and inode64 mount option risk operations
 243           failing with EOVERFLOW once 33-bit inode numbers are reached.
 244
 245           To override this configured default, use the inode32 or inode64
 246           option when mounting.
 247
 248           If unsure, say N.
 249
 250 config ARCH_SUPPORTS_HUGETLBFS
 251         def_bool n
 252
 253 config HUGETLBFS
 254         bool "HugeTLB file system support"
 255         depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
 256         help
 257           hugetlbfs is a filesystem backing for HugeTLB pages, based on
 258           ramfs. For architectures that support it, say Y here and read
 259           <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
 260
 261           If unsure, say N.
 262
 263 config HUGETLB_PAGE
 264         def_bool HUGETLBFS
 265
 266 config HUGETLB_PAGE_FREE_VMEMMAP
 267         def_bool HUGETLB_PAGE
 268         depends on X86_64
 269         depends on SPARSEMEM_VMEMMAP
 270
 271 config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
 272         bool "Default freeing vmemmap pages of HugeTLB to on"
 273         default n
 274         depends on HUGETLB_PAGE_FREE_VMEMMAP
 275         help
 276           When using HUGETLB_PAGE_FREE_VMEMMAP, the freeing unused vmemmap
 277           pages associated with each HugeTLB page is default off. Say Y here
 278           to enable freeing vmemmap pages of HugeTLB by default. It can then
 279           be disabled on the command line via hugetlb_free_vmemmap=off.
 280
 281 config MEMFD_CREATE
 282         def_bool TMPFS || HUGETLBFS
 283
 284 config ARCH_HAS_GIGANTIC_PAGE
 285         bool
 286
 287 source "fs/configfs/Kconfig"
 288 source "fs/efivarfs/Kconfig"
 289
 290 endmenu
 291
 292 menuconfig MISC_FILESYSTEMS
 293         bool "Miscellaneous filesystems"
 294         default y
 295         help
 296           Say Y here to get to see options for various miscellaneous
 297           filesystems, such as filesystems that came from other
 298           operating systems.
 299
 300           This option alone does not add any kernel code.
 301
 302           If you say N, all options in this submenu will be skipped and
 303           disabled; if unsure, say Y here.
 304
 305 if MISC_FILESYSTEMS
 306
 307 source "fs/orangefs/Kconfig"
 308 source "fs/adfs/Kconfig"
 309 source "fs/affs/Kconfig"
 310 source "fs/ecryptfs/Kconfig"
 311 source "fs/hfs/Kconfig"
 312 source "fs/hfsplus/Kconfig"
 313 source "fs/befs/Kconfig"
 314 source "fs/bfs/Kconfig"
 315 source "fs/efs/Kconfig"
 316 source "fs/jffs2/Kconfig"
 317 # UBIFS File system configuration
 318 source "fs/ubifs/Kconfig"
 319 source "fs/cramfs/Kconfig"
 320 source "fs/squashfs/Kconfig"
 321 source "fs/freevxfs/Kconfig"
 322 source "fs/minix/Kconfig"
 323 source "fs/omfs/Kconfig"
 324 source "fs/hpfs/Kconfig"
 325 source "fs/qnx4/Kconfig"
 326 source "fs/qnx6/Kconfig"
 327 source "fs/romfs/Kconfig"
 328 source "fs/pstore/Kconfig"
 329 source "fs/sysv/Kconfig"
 330 source "fs/ufs/Kconfig"
 331 source "fs/erofs/Kconfig"
 332 source "fs/vboxsf/Kconfig"
 333
 334 endif # MISC_FILESYSTEMS
 335
 336 menuconfig NETWORK_FILESYSTEMS
 337         bool "Network File Systems"
 338         default y
 339         depends on NET
 340         help
 341           Say Y here to get to see options for network filesystems and
 342           filesystem-related networking code, such as NFS daemon and
 343           RPCSEC security modules.
 344
 345           This option alone does not add any kernel code.
 346
 347           If you say N, all options in this submenu will be skipped and
 348           disabled; if unsure, say Y here.
 349
 350 if NETWORK_FILESYSTEMS
 351
 352 source "fs/nfs/Kconfig"
 353 source "fs/nfsd/Kconfig"
 354
 355 config GRACE_PERIOD
 356         tristate
 357
 358 config LOCKD
 359         tristate
 360         depends on FILE_LOCKING
 361         select GRACE_PERIOD
 362
 363 config LOCKD_V4
 364         bool
 365         depends on NFSD_V3 || NFS_V3
 366         depends on FILE_LOCKING
 367         default y
 368
 369 config NFS_ACL_SUPPORT
 370         tristate
 371         select FS_POSIX_ACL
 372
 373 config NFS_COMMON
 374         bool
 375         depends on NFSD || NFS_FS || LOCKD
 376         default y
 377
 378 config NFS_V4_2_SSC_HELPER
 379         bool
 380         default y if NFS_V4_2
 381
 382 source "net/sunrpc/Kconfig"
 383 source "fs/ceph/Kconfig"
 384
 385 source "fs/cifs/Kconfig"
 386 source "fs/ksmbd/Kconfig"
 387
 388 config SMBFS_COMMON
 389         tristate
 390         default y if CIFS=y
 391         default m if CIFS=m
 392
 393 source "fs/coda/Kconfig"
 394 source "fs/afs/Kconfig"
 395 source "fs/9p/Kconfig"
 396
 397 endif # NETWORK_FILESYSTEMS
 398
 399 source "fs/nls/Kconfig"
 400 source "fs/dlm/Kconfig"
 401 source "fs/unicode/Kconfig"
 402
 403 config IO_WQ
 404         bool
 405
 406 endmenu