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 !(ARM || MIPS || SPARC)
64 depends on ZONE_DEVICE || FS_DAX_LIMITED
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.
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:
77 # ndctl create-namespace --force --reconfig=namespace0.0 \
78 --mode=fsdax --map=mem
80 See the 'create-namespace' man page for details on the overhead of
82 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
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.
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
97 depends on ZONE_DEVICE
98 depends on TRANSPARENT_HUGEPAGE
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
107 # Posix ACL utility routines
109 # Note: Posix ACLs can be implemented without these helpers. Never use
110 # this symbol for ifdefs in core code.
118 config EXPORTFS_BLOCK_OPS
119 bool "Enable filesystem export operations for block IO"
121 This option enables the export operations for a filesystem to support
125 bool "Enable POSIX file locking API" if EXPERT
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.
132 source "fs/crypto/Kconfig"
134 source "fs/verity/Kconfig"
136 source "fs/notify/Kconfig"
138 source "fs/quota/Kconfig"
140 source "fs/autofs/Kconfig"
141 source "fs/fuse/Kconfig"
142 source "fs/overlayfs/Kconfig"
146 source "fs/netfs/Kconfig"
147 source "fs/fscache/Kconfig"
148 source "fs/cachefiles/Kconfig"
153 menu "CD-ROM/DVD Filesystems"
155 source "fs/isofs/Kconfig"
156 source "fs/udf/Kconfig"
162 menu "DOS/FAT/EXFAT/NT Filesystems"
164 source "fs/fat/Kconfig"
165 source "fs/exfat/Kconfig"
166 source "fs/ntfs/Kconfig"
167 source "fs/ntfs3/Kconfig"
172 menu "Pseudo filesystems"
174 source "fs/proc/Kconfig"
175 source "fs/kernfs/Kconfig"
176 source "fs/sysfs/Kconfig"
179 bool "Tmpfs virtual memory file system support (former shm fs)"
183 Tmpfs is a file system which keeps all files in virtual memory.
185 Everything in tmpfs is temporary in the sense that no files will be
186 created on your hard drive. The files live in memory and swap
187 space. If you unmount a tmpfs instance, everything stored therein is
190 See <file:Documentation/filesystems/tmpfs.rst> for details.
192 config TMPFS_POSIX_ACL
193 bool "Tmpfs POSIX Access Control Lists"
198 POSIX Access Control Lists (ACLs) support additional access rights
199 for users and groups beyond the standard owner/group/world scheme,
200 and this option selects support for ACLs specifically for tmpfs
203 If you've selected TMPFS, it's possible that you'll also need
204 this option as there are a number of Linux distros that require
205 POSIX ACL support under /dev for certain features to work properly.
206 For example, some distros need this feature for ALSA-related /dev
207 files for sound to work properly. In short, if you're not sure,
211 bool "Tmpfs extended attributes"
215 Extended attributes are name:value pairs associated with inodes by
216 the kernel or by users (see the attr(5) manual page for details).
218 This enables support for the trusted.*, security.* and user.*
221 You need this for POSIX ACL support on tmpfs.
226 bool "Use 64-bit ino_t by default in tmpfs"
227 depends on TMPFS && 64BIT
230 tmpfs has historically used only inode numbers as wide as an unsigned
231 int. In some cases this can cause wraparound, potentially resulting
232 in multiple files with the same inode number on a single device. This
233 option makes tmpfs use the full width of ino_t by default, without
234 needing to specify the inode64 option when mounting.
236 But if a long-lived tmpfs is to be accessed by 32-bit applications so
237 ancient that opening a file larger than 2GiB fails with EINVAL, then
238 the INODE64 config option and inode64 mount option risk operations
239 failing with EOVERFLOW once 33-bit inode numbers are reached.
241 To override this configured default, use the inode32 or inode64
242 option when mounting.
247 bool "Tmpfs quota support"
251 Quota support allows to set per user and group limits for tmpfs
252 usage. Say Y to enable quota support. Once enabled you can control
253 user and group quota enforcement with quota, usrquota and grpquota
258 config ARCH_SUPPORTS_HUGETLBFS
262 bool "HugeTLB file system support"
263 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
264 depends on (SYSFS || SYSCTL)
267 hugetlbfs is a filesystem backing for HugeTLB pages, based on
268 ramfs. For architectures that support it, say Y here and read
269 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
274 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
275 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
277 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
279 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
280 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
281 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
288 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
289 def_bool HUGETLB_PAGE
290 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
291 depends on SPARSEMEM_VMEMMAP
293 config ARCH_HAS_GIGANTIC_PAGE
296 source "fs/configfs/Kconfig"
297 source "fs/efivarfs/Kconfig"
301 menuconfig MISC_FILESYSTEMS
302 bool "Miscellaneous filesystems"
305 Say Y here to get to see options for various miscellaneous
306 filesystems, such as filesystems that came from other
309 This option alone does not add any kernel code.
311 If you say N, all options in this submenu will be skipped and
312 disabled; if unsure, say Y here.
316 source "fs/orangefs/Kconfig"
317 source "fs/adfs/Kconfig"
318 source "fs/affs/Kconfig"
319 source "fs/ecryptfs/Kconfig"
320 source "fs/hfs/Kconfig"
321 source "fs/hfsplus/Kconfig"
322 source "fs/befs/Kconfig"
323 source "fs/bfs/Kconfig"
324 source "fs/efs/Kconfig"
325 source "fs/jffs2/Kconfig"
326 # UBIFS File system configuration
327 source "fs/ubifs/Kconfig"
328 source "fs/cramfs/Kconfig"
329 source "fs/squashfs/Kconfig"
330 source "fs/freevxfs/Kconfig"
331 source "fs/minix/Kconfig"
332 source "fs/omfs/Kconfig"
333 source "fs/hpfs/Kconfig"
334 source "fs/qnx4/Kconfig"
335 source "fs/qnx6/Kconfig"
336 source "fs/romfs/Kconfig"
337 source "fs/pstore/Kconfig"
338 source "fs/sysv/Kconfig"
339 source "fs/ufs/Kconfig"
340 source "fs/erofs/Kconfig"
341 source "fs/vboxsf/Kconfig"
343 endif # MISC_FILESYSTEMS
345 menuconfig NETWORK_FILESYSTEMS
346 bool "Network File Systems"
350 Say Y here to get to see options for network filesystems and
351 filesystem-related networking code, such as NFS daemon and
352 RPCSEC security modules.
354 This option alone does not add any kernel code.
356 If you say N, all options in this submenu will be skipped and
357 disabled; if unsure, say Y here.
359 if NETWORK_FILESYSTEMS
361 source "fs/nfs/Kconfig"
362 source "fs/nfsd/Kconfig"
369 depends on FILE_LOCKING
374 depends on NFSD || NFS_V3
375 depends on FILE_LOCKING
378 config NFS_ACL_SUPPORT
384 depends on NFSD || NFS_FS || LOCKD
387 config NFS_V4_2_SSC_HELPER
389 default y if NFS_V4_2
391 source "net/sunrpc/Kconfig"
392 source "fs/ceph/Kconfig"
394 source "fs/smb/Kconfig"
395 source "fs/coda/Kconfig"
396 source "fs/afs/Kconfig"
397 source "fs/9p/Kconfig"
399 endif # NETWORK_FILESYSTEMS
401 source "fs/nls/Kconfig"
402 source "fs/dlm/Kconfig"
403 source "fs/unicode/Kconfig"