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/cachefiles/Kconfig"
152 menu "CD-ROM/DVD Filesystems"
154 source "fs/isofs/Kconfig"
155 source "fs/udf/Kconfig"
161 menu "DOS/FAT/EXFAT/NT Filesystems"
163 source "fs/fat/Kconfig"
164 source "fs/exfat/Kconfig"
165 source "fs/ntfs3/Kconfig"
170 menu "Pseudo filesystems"
172 source "fs/proc/Kconfig"
173 source "fs/kernfs/Kconfig"
174 source "fs/sysfs/Kconfig"
177 bool "Pseudo filesystem for process file descriptors"
181 Pidfs implements advanced features for process file descriptors.
184 bool "Tmpfs virtual memory file system support (former shm fs)"
188 Tmpfs is a file system which keeps all files in virtual memory.
190 Everything in tmpfs is temporary in the sense that no files will be
191 created on your hard drive. The files live in memory and swap
192 space. If you unmount a tmpfs instance, everything stored therein is
195 See <file:Documentation/filesystems/tmpfs.rst> for details.
197 config TMPFS_POSIX_ACL
198 bool "Tmpfs POSIX Access Control Lists"
203 POSIX Access Control Lists (ACLs) support additional access rights
204 for users and groups beyond the standard owner/group/world scheme,
205 and this option selects support for ACLs specifically for tmpfs
208 If you've selected TMPFS, it's possible that you'll also need
209 this option as there are a number of Linux distros that require
210 POSIX ACL support under /dev for certain features to work properly.
211 For example, some distros need this feature for ALSA-related /dev
212 files for sound to work properly. In short, if you're not sure,
216 bool "Tmpfs extended attributes"
220 Extended attributes are name:value pairs associated with inodes by
221 the kernel or by users (see the attr(5) manual page for details).
223 This enables support for the trusted.*, security.* and user.*
226 You need this for POSIX ACL support on tmpfs.
231 bool "Use 64-bit ino_t by default in tmpfs"
232 depends on TMPFS && 64BIT
235 tmpfs has historically used only inode numbers as wide as an unsigned
236 int. In some cases this can cause wraparound, potentially resulting
237 in multiple files with the same inode number on a single device. This
238 option makes tmpfs use the full width of ino_t by default, without
239 needing to specify the inode64 option when mounting.
241 But if a long-lived tmpfs is to be accessed by 32-bit applications so
242 ancient that opening a file larger than 2GiB fails with EINVAL, then
243 the INODE64 config option and inode64 mount option risk operations
244 failing with EOVERFLOW once 33-bit inode numbers are reached.
246 To override this configured default, use the inode32 or inode64
247 option when mounting.
252 bool "Tmpfs quota support"
256 Quota support allows to set per user and group limits for tmpfs
257 usage. Say Y to enable quota support. Once enabled you can control
258 user and group quota enforcement with quota, usrquota and grpquota
263 config ARCH_SUPPORTS_HUGETLBFS
267 bool "HugeTLB file system support"
268 depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
269 depends on (SYSFS || SYSCTL)
272 hugetlbfs is a filesystem backing for HugeTLB pages, based on
273 ramfs. For architectures that support it, say Y here and read
274 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
279 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
280 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
282 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
284 The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
285 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
286 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
293 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
294 def_bool HUGETLB_PAGE
295 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
296 depends on SPARSEMEM_VMEMMAP
298 config ARCH_HAS_GIGANTIC_PAGE
301 source "fs/configfs/Kconfig"
302 source "fs/efivarfs/Kconfig"
306 menuconfig MISC_FILESYSTEMS
307 bool "Miscellaneous filesystems"
310 Say Y here to get to see options for various miscellaneous
311 filesystems, such as filesystems that came from other
314 This option alone does not add any kernel code.
316 If you say N, all options in this submenu will be skipped and
317 disabled; if unsure, say Y here.
321 source "fs/orangefs/Kconfig"
322 source "fs/adfs/Kconfig"
323 source "fs/affs/Kconfig"
324 source "fs/ecryptfs/Kconfig"
325 source "fs/hfs/Kconfig"
326 source "fs/hfsplus/Kconfig"
327 source "fs/befs/Kconfig"
328 source "fs/bfs/Kconfig"
329 source "fs/efs/Kconfig"
330 source "fs/jffs2/Kconfig"
331 # UBIFS File system configuration
332 source "fs/ubifs/Kconfig"
333 source "fs/cramfs/Kconfig"
334 source "fs/squashfs/Kconfig"
335 source "fs/freevxfs/Kconfig"
336 source "fs/minix/Kconfig"
337 source "fs/omfs/Kconfig"
338 source "fs/hpfs/Kconfig"
339 source "fs/qnx4/Kconfig"
340 source "fs/qnx6/Kconfig"
341 source "fs/romfs/Kconfig"
342 source "fs/pstore/Kconfig"
343 source "fs/sysv/Kconfig"
344 source "fs/ufs/Kconfig"
345 source "fs/erofs/Kconfig"
346 source "fs/vboxsf/Kconfig"
348 endif # MISC_FILESYSTEMS
350 menuconfig NETWORK_FILESYSTEMS
351 bool "Network File Systems"
355 Say Y here to get to see options for network filesystems and
356 filesystem-related networking code, such as NFS daemon and
357 RPCSEC security modules.
359 This option alone does not add any kernel code.
361 If you say N, all options in this submenu will be skipped and
362 disabled; if unsure, say Y here.
364 if NETWORK_FILESYSTEMS
366 source "fs/nfs/Kconfig"
367 source "fs/nfsd/Kconfig"
374 depends on FILE_LOCKING
379 depends on NFSD || NFS_V3
380 depends on FILE_LOCKING
383 config NFS_ACL_SUPPORT
389 depends on NFSD || NFS_FS || LOCKD
392 config NFS_V4_2_SSC_HELPER
394 default y if NFS_V4_2
396 source "net/sunrpc/Kconfig"
397 source "fs/ceph/Kconfig"
399 source "fs/smb/Kconfig"
400 source "fs/coda/Kconfig"
401 source "fs/afs/Kconfig"
402 source "fs/9p/Kconfig"
404 endif # NETWORK_FILESYSTEMS
406 source "fs/nls/Kconfig"
407 source "fs/dlm/Kconfig"
408 source "fs/unicode/Kconfig"