1 # SPDX-License-Identifier: GPL-2.0-only
3 # File system configuration
8 # Use unaligned word dcache accesses
9 config DCACHE_WORD_ACCESS
12 config VALIDATE_FS_PARSER
13 bool "Validate filesystem parameter description"
15 Enable this to perform validation of the parameter description for a
16 filesystem when it is registered.
21 # Stackable filesystems
28 # old blockdev_direct_IO implementation. Use iomap for new code instead
29 config LEGACY_DIRECT_IO
30 depends on BUFFER_HEAD
35 source "fs/ext2/Kconfig"
36 source "fs/ext4/Kconfig"
37 source "fs/jbd2/Kconfig"
40 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
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
46 source "fs/jfs/Kconfig"
48 source "fs/xfs/Kconfig"
49 source "fs/gfs2/Kconfig"
50 source "fs/ocfs2/Kconfig"
51 source "fs/btrfs/Kconfig"
52 source "fs/nilfs2/Kconfig"
53 source "fs/f2fs/Kconfig"
54 source "fs/bcachefs/Kconfig"
55 source "fs/zonefs/Kconfig"
60 bool "File system based Direct Access (DAX) support"
62 depends on ZONE_DEVICE || FS_DAX_LIMITED
66 Direct Access (DAX) can be used on memory-backed block devices.
67 If the block device supports DAX and the filesystem supports DAX,
68 then you can avoid using the pagecache to buffer I/Os. Turning
69 on this option will compile in support for DAX.
71 For a DAX device to support file system access it needs to have
72 struct pages. For the nfit based NVDIMMs this can be enabled
73 using the ndctl utility:
75 # ndctl create-namespace --force --reconfig=namespace0.0 \
76 --mode=fsdax --map=mem
78 See the 'create-namespace' man page for details on the overhead of
80 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
82 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
83 file systems DAX support needs to be manually enabled globally or
84 per-inode using a mount option as well. See the file documentation in
85 Documentation/filesystems/dax.rst for details.
87 If you do not have a block device that is capable of using this,
88 or if unsure, say N. Saying Y will increase the size of the kernel
95 depends on ZONE_DEVICE
96 depends on TRANSPARENT_HUGEPAGE
98 # Selected by DAX drivers that do not expect filesystem DAX to support
99 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
100 # for fork() of processes with MAP_SHARED mappings or support for
101 # direct-I/O to a DAX mapping.
102 config FS_DAX_LIMITED
105 # Posix ACL utility routines
107 # Note: Posix ACLs can be implemented without these helpers. Never use
108 # this symbol for ifdefs in core code.
116 config EXPORTFS_BLOCK_OPS
117 bool "Enable filesystem export operations for block IO"
119 This option enables the export operations for a filesystem to support
123 bool "Enable POSIX file locking API" if EXPERT
126 This option enables standard file locking support, required
127 for filesystems like NFS and for the flock() system
128 call. Disabling this option saves about 11k.
130 source "fs/crypto/Kconfig"
132 source "fs/verity/Kconfig"
134 source "fs/notify/Kconfig"
136 source "fs/quota/Kconfig"
138 source "fs/autofs/Kconfig"
139 source "fs/fuse/Kconfig"
140 source "fs/overlayfs/Kconfig"
144 source "fs/netfs/Kconfig"
145 source "fs/cachefiles/Kconfig"
150 menu "CD-ROM/DVD Filesystems"
152 source "fs/isofs/Kconfig"
153 source "fs/udf/Kconfig"
159 menu "DOS/FAT/EXFAT/NT Filesystems"
161 source "fs/fat/Kconfig"
162 source "fs/exfat/Kconfig"
163 source "fs/ntfs3/Kconfig"
168 menu "Pseudo filesystems"
170 source "fs/proc/Kconfig"
171 source "fs/kernfs/Kconfig"
172 source "fs/sysfs/Kconfig"
175 bool "Tmpfs virtual memory file system support (former shm fs)"
179 Tmpfs is a file system which keeps all files in virtual memory.
181 Everything in tmpfs is temporary in the sense that no files will be
182 created on your hard drive. The files live in memory and swap
183 space. If you unmount a tmpfs instance, everything stored therein is
186 See <file:Documentation/filesystems/tmpfs.rst> for details.
188 config TMPFS_POSIX_ACL
189 bool "Tmpfs POSIX Access Control Lists"
194 POSIX Access Control Lists (ACLs) support additional access rights
195 for users and groups beyond the standard owner/group/world scheme,
196 and this option selects support for ACLs specifically for tmpfs
199 If you've selected TMPFS, it's possible that you'll also need
200 this option as there are a number of Linux distros that require
201 POSIX ACL support under /dev for certain features to work properly.
202 For example, some distros need this feature for ALSA-related /dev
203 files for sound to work properly. In short, if you're not sure,
207 bool "Tmpfs extended attributes"
211 Extended attributes are name:value pairs associated with inodes by
212 the kernel or by users (see the attr(5) manual page for details).
214 This enables support for the trusted.*, security.* and user.*
217 You need this for POSIX ACL support on tmpfs.
222 bool "Use 64-bit ino_t by default in tmpfs"
223 depends on TMPFS && 64BIT
226 tmpfs has historically used only inode numbers as wide as an unsigned
227 int. In some cases this can cause wraparound, potentially resulting
228 in multiple files with the same inode number on a single device. This
229 option makes tmpfs use the full width of ino_t by default, without
230 needing to specify the inode64 option when mounting.
232 But if a long-lived tmpfs is to be accessed by 32-bit applications so
233 ancient that opening a file larger than 2GiB fails with EINVAL, then
234 the INODE64 config option and inode64 mount option risk operations
235 failing with EOVERFLOW once 33-bit inode numbers are reached.
237 To override this configured default, use the inode32 or inode64
238 option when mounting.
243 bool "Tmpfs quota support"
247 Quota support allows to set per user and group limits for tmpfs
248 usage. Say Y to enable quota support. Once enabled you can control
249 user and group quota enforcement with quota, usrquota and grpquota
254 config ARCH_SUPPORTS_HUGETLBFS
258 bool "HugeTLB file system support"
259 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
260 depends on (SYSFS || SYSCTL)
264 hugetlbfs is a filesystem backing for HugeTLB pages, based on
265 ramfs. For architectures that support it, say Y here and read
266 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
271 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
272 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
274 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
276 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
277 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
278 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
285 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
286 def_bool HUGETLB_PAGE
287 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
288 depends on SPARSEMEM_VMEMMAP
290 config HUGETLB_PMD_PAGE_TABLE_SHARING
291 def_bool HUGETLB_PAGE
292 depends on ARCH_WANT_HUGE_PMD_SHARE && SPLIT_PMD_PTLOCKS
294 config ARCH_HAS_GIGANTIC_PAGE
297 source "fs/configfs/Kconfig"
298 source "fs/efivarfs/Kconfig"
302 menuconfig MISC_FILESYSTEMS
303 bool "Miscellaneous filesystems"
306 Say Y here to get to see options for various miscellaneous
307 filesystems, such as filesystems that came from other
310 This option alone does not add any kernel code.
312 If you say N, all options in this submenu will be skipped and
313 disabled; if unsure, say Y here.
317 source "fs/orangefs/Kconfig"
318 source "fs/adfs/Kconfig"
319 source "fs/affs/Kconfig"
320 source "fs/ecryptfs/Kconfig"
321 source "fs/hfs/Kconfig"
322 source "fs/hfsplus/Kconfig"
323 source "fs/befs/Kconfig"
324 source "fs/bfs/Kconfig"
325 source "fs/efs/Kconfig"
326 source "fs/jffs2/Kconfig"
327 # UBIFS File system configuration
328 source "fs/ubifs/Kconfig"
329 source "fs/cramfs/Kconfig"
330 source "fs/squashfs/Kconfig"
331 source "fs/freevxfs/Kconfig"
332 source "fs/minix/Kconfig"
333 source "fs/omfs/Kconfig"
334 source "fs/hpfs/Kconfig"
335 source "fs/qnx4/Kconfig"
336 source "fs/qnx6/Kconfig"
337 source "fs/romfs/Kconfig"
338 source "fs/pstore/Kconfig"
339 source "fs/sysv/Kconfig"
340 source "fs/ufs/Kconfig"
341 source "fs/erofs/Kconfig"
342 source "fs/vboxsf/Kconfig"
344 endif # MISC_FILESYSTEMS
346 menuconfig NETWORK_FILESYSTEMS
347 bool "Network File Systems"
351 Say Y here to get to see options for network filesystems and
352 filesystem-related networking code, such as NFS daemon and
353 RPCSEC security modules.
355 This option alone does not add any kernel code.
357 If you say N, all options in this submenu will be skipped and
358 disabled; if unsure, say Y here.
360 if NETWORK_FILESYSTEMS
362 source "fs/nfs/Kconfig"
363 source "fs/nfsd/Kconfig"
370 depends on FILE_LOCKING
375 depends on NFSD || NFS_V3
376 depends on FILE_LOCKING
379 config NFS_ACL_SUPPORT
385 depends on NFSD || NFS_FS || LOCKD
388 config NFS_COMMON_LOCALIO_SUPPORT
390 depends on NFS_LOCALIO
391 default y if NFSD=y || NFS_FS=y
392 default m if NFSD=m && NFS_FS=m
396 bool "NFS client and server support for LOCALIO auxiliary protocol"
397 depends on NFSD && NFS_FS
398 select NFS_COMMON_LOCALIO_SUPPORT
401 Some NFS servers support an auxiliary NFS LOCALIO protocol
402 that is not an official part of the NFS protocol.
404 This option enables support for the LOCALIO protocol in the
405 kernel's NFS server and client. Enable this to permit local
406 NFS clients to bypass the network when issuing reads and
407 writes to the local NFS server.
411 config NFS_V4_2_SSC_HELPER
413 default y if NFS_V4_2
415 source "net/sunrpc/Kconfig"
416 source "fs/ceph/Kconfig"
418 source "fs/smb/Kconfig"
419 source "fs/coda/Kconfig"
420 source "fs/afs/Kconfig"
421 source "fs/9p/Kconfig"
423 endif # NETWORK_FILESYSTEMS
425 source "fs/nls/Kconfig"
426 source "fs/dlm/Kconfig"
427 source "fs/unicode/Kconfig"