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.
24 # old blockdev_direct_IO implementation. Use iomap for new code instead
25 config LEGACY_DIRECT_IO
26 depends on BUFFER_HEAD
31 source "fs/ext2/Kconfig"
32 source "fs/ext4/Kconfig"
33 source "fs/jbd2/Kconfig"
36 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
38 default y if EXT2_FS=y && EXT2_FS_XATTR
39 default y if EXT4_FS=y
40 default m if EXT2_FS_XATTR || EXT4_FS
42 source "fs/reiserfs/Kconfig"
43 source "fs/jfs/Kconfig"
45 source "fs/xfs/Kconfig"
46 source "fs/gfs2/Kconfig"
47 source "fs/ocfs2/Kconfig"
48 source "fs/btrfs/Kconfig"
49 source "fs/nilfs2/Kconfig"
50 source "fs/f2fs/Kconfig"
51 source "fs/bcachefs/Kconfig"
52 source "fs/zonefs/Kconfig"
57 bool "File system based Direct Access (DAX) support"
59 depends on !(ARM || MIPS || SPARC)
60 depends on ZONE_DEVICE || FS_DAX_LIMITED
64 Direct Access (DAX) can be used on memory-backed block devices.
65 If the block device supports DAX and the filesystem supports DAX,
66 then you can avoid using the pagecache to buffer I/Os. Turning
67 on this option will compile in support for DAX.
69 For a DAX device to support file system access it needs to have
70 struct pages. For the nfit based NVDIMMs this can be enabled
71 using the ndctl utility:
73 # ndctl create-namespace --force --reconfig=namespace0.0 \
74 --mode=fsdax --map=mem
76 See the 'create-namespace' man page for details on the overhead of
78 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
80 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
81 file systems DAX support needs to be manually enabled globally or
82 per-inode using a mount option as well. See the file documentation in
83 Documentation/filesystems/dax.rst for details.
85 If you do not have a block device that is capable of using this,
86 or if unsure, say N. Saying Y will increase the size of the kernel
93 depends on ZONE_DEVICE
94 depends on TRANSPARENT_HUGEPAGE
96 # Selected by DAX drivers that do not expect filesystem DAX to support
97 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
98 # for fork() of processes with MAP_SHARED mappings or support for
99 # direct-I/O to a DAX mapping.
100 config FS_DAX_LIMITED
103 # Posix ACL utility routines
105 # Note: Posix ACLs can be implemented without these helpers. Never use
106 # this symbol for ifdefs in core code.
114 config EXPORTFS_BLOCK_OPS
115 bool "Enable filesystem export operations for block IO"
117 This option enables the export operations for a filesystem to support
121 bool "Enable POSIX file locking API" if EXPERT
124 This option enables standard file locking support, required
125 for filesystems like NFS and for the flock() system
126 call. Disabling this option saves about 11k.
128 source "fs/crypto/Kconfig"
130 source "fs/verity/Kconfig"
132 source "fs/notify/Kconfig"
134 source "fs/quota/Kconfig"
136 source "fs/autofs/Kconfig"
137 source "fs/fuse/Kconfig"
138 source "fs/overlayfs/Kconfig"
142 source "fs/netfs/Kconfig"
143 source "fs/fscache/Kconfig"
144 source "fs/cachefiles/Kconfig"
149 menu "CD-ROM/DVD Filesystems"
151 source "fs/isofs/Kconfig"
152 source "fs/udf/Kconfig"
158 menu "DOS/FAT/EXFAT/NT Filesystems"
160 source "fs/fat/Kconfig"
161 source "fs/exfat/Kconfig"
162 source "fs/ntfs/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)
263 hugetlbfs is a filesystem backing for HugeTLB pages, based on
264 ramfs. For architectures that support it, say Y here and read
265 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
272 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
273 def_bool HUGETLB_PAGE
274 depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
275 depends on SPARSEMEM_VMEMMAP
277 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
278 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
280 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
282 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to
283 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
284 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
286 config ARCH_HAS_GIGANTIC_PAGE
289 source "fs/configfs/Kconfig"
290 source "fs/efivarfs/Kconfig"
294 menuconfig MISC_FILESYSTEMS
295 bool "Miscellaneous filesystems"
298 Say Y here to get to see options for various miscellaneous
299 filesystems, such as filesystems that came from other
302 This option alone does not add any kernel code.
304 If you say N, all options in this submenu will be skipped and
305 disabled; if unsure, say Y here.
309 source "fs/orangefs/Kconfig"
310 source "fs/adfs/Kconfig"
311 source "fs/affs/Kconfig"
312 source "fs/ecryptfs/Kconfig"
313 source "fs/hfs/Kconfig"
314 source "fs/hfsplus/Kconfig"
315 source "fs/befs/Kconfig"
316 source "fs/bfs/Kconfig"
317 source "fs/efs/Kconfig"
318 source "fs/jffs2/Kconfig"
319 # UBIFS File system configuration
320 source "fs/ubifs/Kconfig"
321 source "fs/cramfs/Kconfig"
322 source "fs/squashfs/Kconfig"
323 source "fs/freevxfs/Kconfig"
324 source "fs/minix/Kconfig"
325 source "fs/omfs/Kconfig"
326 source "fs/hpfs/Kconfig"
327 source "fs/qnx4/Kconfig"
328 source "fs/qnx6/Kconfig"
329 source "fs/romfs/Kconfig"
330 source "fs/pstore/Kconfig"
331 source "fs/sysv/Kconfig"
332 source "fs/ufs/Kconfig"
333 source "fs/erofs/Kconfig"
334 source "fs/vboxsf/Kconfig"
336 endif # MISC_FILESYSTEMS
338 menuconfig NETWORK_FILESYSTEMS
339 bool "Network File Systems"
343 Say Y here to get to see options for network filesystems and
344 filesystem-related networking code, such as NFS daemon and
345 RPCSEC security modules.
347 This option alone does not add any kernel code.
349 If you say N, all options in this submenu will be skipped and
350 disabled; if unsure, say Y here.
352 if NETWORK_FILESYSTEMS
354 source "fs/nfs/Kconfig"
355 source "fs/nfsd/Kconfig"
362 depends on FILE_LOCKING
367 depends on NFSD || NFS_V3
368 depends on FILE_LOCKING
371 config NFS_ACL_SUPPORT
377 depends on NFSD || NFS_FS || LOCKD
380 config NFS_V4_2_SSC_HELPER
382 default y if NFS_V4_2
384 source "net/sunrpc/Kconfig"
385 source "fs/ceph/Kconfig"
387 source "fs/smb/Kconfig"
388 source "fs/coda/Kconfig"
389 source "fs/afs/Kconfig"
390 source "fs/9p/Kconfig"
392 endif # NETWORK_FILESYSTEMS
394 source "fs/nls/Kconfig"
395 source "fs/dlm/Kconfig"
396 source "fs/unicode/Kconfig"