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/reiserfs/Kconfig"
47 source "fs/jfs/Kconfig"
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"
61 bool "File system based Direct Access (DAX) support"
63 depends on ZONE_DEVICE || FS_DAX_LIMITED
67 Direct Access (DAX) can be used on memory-backed block devices.
68 If the block device supports DAX and the filesystem supports DAX,
69 then you can avoid using the pagecache to buffer I/Os. Turning
70 on this option will compile in support for DAX.
72 For a DAX device to support file system access it needs to have
73 struct pages. For the nfit based NVDIMMs this can be enabled
74 using the ndctl utility:
76 # ndctl create-namespace --force --reconfig=namespace0.0 \
77 --mode=fsdax --map=mem
79 See the 'create-namespace' man page for details on the overhead of
81 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
83 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
84 file systems DAX support needs to be manually enabled globally or
85 per-inode using a mount option as well. See the file documentation in
86 Documentation/filesystems/dax.rst for details.
88 If you do not have a block device that is capable of using this,
89 or if unsure, say N. Saying Y will increase the size of the kernel
96 depends on ZONE_DEVICE
97 depends on TRANSPARENT_HUGEPAGE
99 # Selected by DAX drivers that do not expect filesystem DAX to support
100 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
101 # for fork() of processes with MAP_SHARED mappings or support for
102 # direct-I/O to a DAX mapping.
103 config FS_DAX_LIMITED
106 # Posix ACL utility routines
108 # Note: Posix ACLs can be implemented without these helpers. Never use
109 # this symbol for ifdefs in core code.
117 config EXPORTFS_BLOCK_OPS
118 bool "Enable filesystem export operations for block IO"
120 This option enables the export operations for a filesystem to support
124 bool "Enable POSIX file locking API" if EXPERT
127 This option enables standard file locking support, required
128 for filesystems like NFS and for the flock() system
129 call. Disabling this option saves about 11k.
131 source "fs/crypto/Kconfig"
133 source "fs/verity/Kconfig"
135 source "fs/notify/Kconfig"
137 source "fs/quota/Kconfig"
139 source "fs/autofs/Kconfig"
140 source "fs/fuse/Kconfig"
141 source "fs/overlayfs/Kconfig"
145 source "fs/netfs/Kconfig"
146 source "fs/cachefiles/Kconfig"
151 menu "CD-ROM/DVD Filesystems"
153 source "fs/isofs/Kconfig"
154 source "fs/udf/Kconfig"
160 menu "DOS/FAT/EXFAT/NT Filesystems"
162 source "fs/fat/Kconfig"
163 source "fs/exfat/Kconfig"
164 source "fs/ntfs3/Kconfig"
169 menu "Pseudo filesystems"
171 source "fs/proc/Kconfig"
172 source "fs/kernfs/Kconfig"
173 source "fs/sysfs/Kconfig"
176 bool "Tmpfs virtual memory file system support (former shm fs)"
180 Tmpfs is a file system which keeps all files in virtual memory.
182 Everything in tmpfs is temporary in the sense that no files will be
183 created on your hard drive. The files live in memory and swap
184 space. If you unmount a tmpfs instance, everything stored therein is
187 See <file:Documentation/filesystems/tmpfs.rst> for details.
189 config TMPFS_POSIX_ACL
190 bool "Tmpfs POSIX Access Control Lists"
195 POSIX Access Control Lists (ACLs) support additional access rights
196 for users and groups beyond the standard owner/group/world scheme,
197 and this option selects support for ACLs specifically for tmpfs
200 If you've selected TMPFS, it's possible that you'll also need
201 this option as there are a number of Linux distros that require
202 POSIX ACL support under /dev for certain features to work properly.
203 For example, some distros need this feature for ALSA-related /dev
204 files for sound to work properly. In short, if you're not sure,
208 bool "Tmpfs extended attributes"
212 Extended attributes are name:value pairs associated with inodes by
213 the kernel or by users (see the attr(5) manual page for details).
215 This enables support for the trusted.*, security.* and user.*
218 You need this for POSIX ACL support on tmpfs.
223 bool "Use 64-bit ino_t by default in tmpfs"
224 depends on TMPFS && 64BIT
227 tmpfs has historically used only inode numbers as wide as an unsigned
228 int. In some cases this can cause wraparound, potentially resulting
229 in multiple files with the same inode number on a single device. This
230 option makes tmpfs use the full width of ino_t by default, without
231 needing to specify the inode64 option when mounting.
233 But if a long-lived tmpfs is to be accessed by 32-bit applications so
234 ancient that opening a file larger than 2GiB fails with EINVAL, then
235 the INODE64 config option and inode64 mount option risk operations
236 failing with EOVERFLOW once 33-bit inode numbers are reached.
238 To override this configured default, use the inode32 or inode64
239 option when mounting.
244 bool "Tmpfs quota support"
248 Quota support allows to set per user and group limits for tmpfs
249 usage. Say Y to enable quota support. Once enabled you can control
250 user and group quota enforcement with quota, usrquota and grpquota
255 config ARCH_SUPPORTS_HUGETLBFS
259 bool "HugeTLB file system support"
260 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
261 depends on (SYSFS || SYSCTL)
265 hugetlbfs is a filesystem backing for HugeTLB pages, based on
266 ramfs. For architectures that support it, say Y here and read
267 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
272 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
273 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
275 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
277 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
278 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
279 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
286 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
287 def_bool HUGETLB_PAGE
288 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
289 depends on SPARSEMEM_VMEMMAP
291 config HUGETLB_PMD_PAGE_TABLE_SHARING
292 def_bool HUGETLB_PAGE
293 depends on ARCH_WANT_HUGE_PMD_SHARE && SPLIT_PMD_PTLOCKS
295 config ARCH_HAS_GIGANTIC_PAGE
298 source "fs/configfs/Kconfig"
299 source "fs/efivarfs/Kconfig"
303 menuconfig MISC_FILESYSTEMS
304 bool "Miscellaneous filesystems"
307 Say Y here to get to see options for various miscellaneous
308 filesystems, such as filesystems that came from other
311 This option alone does not add any kernel code.
313 If you say N, all options in this submenu will be skipped and
314 disabled; if unsure, say Y here.
318 source "fs/orangefs/Kconfig"
319 source "fs/adfs/Kconfig"
320 source "fs/affs/Kconfig"
321 source "fs/ecryptfs/Kconfig"
322 source "fs/hfs/Kconfig"
323 source "fs/hfsplus/Kconfig"
324 source "fs/befs/Kconfig"
325 source "fs/bfs/Kconfig"
326 source "fs/efs/Kconfig"
327 source "fs/jffs2/Kconfig"
328 # UBIFS File system configuration
329 source "fs/ubifs/Kconfig"
330 source "fs/cramfs/Kconfig"
331 source "fs/squashfs/Kconfig"
332 source "fs/freevxfs/Kconfig"
333 source "fs/minix/Kconfig"
334 source "fs/omfs/Kconfig"
335 source "fs/hpfs/Kconfig"
336 source "fs/qnx4/Kconfig"
337 source "fs/qnx6/Kconfig"
338 source "fs/romfs/Kconfig"
339 source "fs/pstore/Kconfig"
340 source "fs/sysv/Kconfig"
341 source "fs/ufs/Kconfig"
342 source "fs/erofs/Kconfig"
343 source "fs/vboxsf/Kconfig"
345 endif # MISC_FILESYSTEMS
347 menuconfig NETWORK_FILESYSTEMS
348 bool "Network File Systems"
352 Say Y here to get to see options for network filesystems and
353 filesystem-related networking code, such as NFS daemon and
354 RPCSEC security modules.
356 This option alone does not add any kernel code.
358 If you say N, all options in this submenu will be skipped and
359 disabled; if unsure, say Y here.
361 if NETWORK_FILESYSTEMS
363 source "fs/nfs/Kconfig"
364 source "fs/nfsd/Kconfig"
371 depends on FILE_LOCKING
376 depends on NFSD || NFS_V3
377 depends on FILE_LOCKING
380 config NFS_ACL_SUPPORT
386 depends on NFSD || NFS_FS || LOCKD
389 config NFS_COMMON_LOCALIO_SUPPORT
392 default y if NFSD=y || NFS_FS=y
393 default m if NFSD=m && NFS_FS=m
397 bool "NFS client and server support for LOCALIO auxiliary protocol"
398 depends on NFSD && NFS_FS
399 select NFS_COMMON_LOCALIO_SUPPORT
402 Some NFS servers support an auxiliary NFS LOCALIO protocol
403 that is not an official part of the NFS protocol.
405 This option enables support for the LOCALIO protocol in the
406 kernel's NFS server and client. Enable this to permit local
407 NFS clients to bypass the network when issuing reads and
408 writes to the local NFS server.
412 config NFS_V4_2_SSC_HELPER
414 default y if NFS_V4_2
416 source "net/sunrpc/Kconfig"
417 source "fs/ceph/Kconfig"
419 source "fs/smb/Kconfig"
420 source "fs/coda/Kconfig"
421 source "fs/afs/Kconfig"
422 source "fs/9p/Kconfig"
424 endif # NETWORK_FILESYSTEMS
426 source "fs/nls/Kconfig"
427 source "fs/dlm/Kconfig"
428 source "fs/unicode/Kconfig"