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 # old blockdev_direct_IO implementation. Use iomap for new code instead
22 config LEGACY_DIRECT_IO
27 source "fs/ext2/Kconfig"
28 source "fs/ext4/Kconfig"
29 source "fs/jbd2/Kconfig"
32 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
34 default y if EXT2_FS=y && EXT2_FS_XATTR
35 default y if EXT4_FS=y
36 default m if EXT2_FS_XATTR || EXT4_FS
38 source "fs/reiserfs/Kconfig"
39 source "fs/jfs/Kconfig"
41 source "fs/xfs/Kconfig"
42 source "fs/gfs2/Kconfig"
43 source "fs/ocfs2/Kconfig"
44 source "fs/btrfs/Kconfig"
45 source "fs/nilfs2/Kconfig"
46 source "fs/f2fs/Kconfig"
47 source "fs/zonefs/Kconfig"
52 bool "File system based Direct Access (DAX) support"
54 depends on !(ARM || MIPS || SPARC)
55 depends on ZONE_DEVICE || FS_DAX_LIMITED
59 Direct Access (DAX) can be used on memory-backed block devices.
60 If the block device supports DAX and the filesystem supports DAX,
61 then you can avoid using the pagecache to buffer I/Os. Turning
62 on this option will compile in support for DAX.
64 For a DAX device to support file system access it needs to have
65 struct pages. For the nfit based NVDIMMs this can be enabled
66 using the ndctl utility:
68 # ndctl create-namespace --force --reconfig=namespace0.0 \
69 --mode=fsdax --map=mem
71 See the 'create-namespace' man page for details on the overhead of
73 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
75 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
76 file systems DAX support needs to be manually enabled globally or
77 per-inode using a mount option as well. See the file documentation in
78 Documentation/filesystems/dax.rst for details.
80 If you do not have a block device that is capable of using this,
81 or if unsure, say N. Saying Y will increase the size of the kernel
88 depends on ZONE_DEVICE
89 depends on TRANSPARENT_HUGEPAGE
91 # Selected by DAX drivers that do not expect filesystem DAX to support
92 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
93 # for fork() of processes with MAP_SHARED mappings or support for
94 # direct-I/O to a DAX mapping.
98 # Posix ACL utility routines
100 # Note: Posix ACLs can be implemented without these helpers. Never use
101 # this symbol for ifdefs in core code.
109 config EXPORTFS_BLOCK_OPS
110 bool "Enable filesystem export operations for block IO"
112 This option enables the export operations for a filesystem to support
116 bool "Enable POSIX file locking API" if EXPERT
119 This option enables standard file locking support, required
120 for filesystems like NFS and for the flock() system
121 call. Disabling this option saves about 11k.
123 source "fs/crypto/Kconfig"
125 source "fs/verity/Kconfig"
127 source "fs/notify/Kconfig"
129 source "fs/quota/Kconfig"
131 source "fs/autofs/Kconfig"
132 source "fs/fuse/Kconfig"
133 source "fs/overlayfs/Kconfig"
137 source "fs/netfs/Kconfig"
138 source "fs/fscache/Kconfig"
139 source "fs/cachefiles/Kconfig"
144 menu "CD-ROM/DVD Filesystems"
146 source "fs/isofs/Kconfig"
147 source "fs/udf/Kconfig"
153 menu "DOS/FAT/EXFAT/NT Filesystems"
155 source "fs/fat/Kconfig"
156 source "fs/exfat/Kconfig"
157 source "fs/ntfs/Kconfig"
158 source "fs/ntfs3/Kconfig"
163 menu "Pseudo filesystems"
165 source "fs/proc/Kconfig"
166 source "fs/kernfs/Kconfig"
167 source "fs/sysfs/Kconfig"
170 bool "Tmpfs virtual memory file system support (former shm fs)"
173 Tmpfs is a file system which keeps all files in virtual memory.
175 Everything in tmpfs is temporary in the sense that no files will be
176 created on your hard drive. The files live in memory and swap
177 space. If you unmount a tmpfs instance, everything stored therein is
180 See <file:Documentation/filesystems/tmpfs.rst> for details.
182 config TMPFS_POSIX_ACL
183 bool "Tmpfs POSIX Access Control Lists"
188 POSIX Access Control Lists (ACLs) support additional access rights
189 for users and groups beyond the standard owner/group/world scheme,
190 and this option selects support for ACLs specifically for tmpfs
193 If you've selected TMPFS, it's possible that you'll also need
194 this option as there are a number of Linux distros that require
195 POSIX ACL support under /dev for certain features to work properly.
196 For example, some distros need this feature for ALSA-related /dev
197 files for sound to work properly. In short, if you're not sure,
201 bool "Tmpfs extended attributes"
205 Extended attributes are name:value pairs associated with inodes by
206 the kernel or by users (see the attr(5) manual page for details).
208 Currently this enables support for the trusted.* and
209 security.* namespaces.
211 You need this for POSIX ACL support on tmpfs.
216 bool "Use 64-bit ino_t by default in tmpfs"
217 depends on TMPFS && 64BIT
220 tmpfs has historically used only inode numbers as wide as an unsigned
221 int. In some cases this can cause wraparound, potentially resulting
222 in multiple files with the same inode number on a single device. This
223 option makes tmpfs use the full width of ino_t by default, without
224 needing to specify the inode64 option when mounting.
226 But if a long-lived tmpfs is to be accessed by 32-bit applications so
227 ancient that opening a file larger than 2GiB fails with EINVAL, then
228 the INODE64 config option and inode64 mount option risk operations
229 failing with EOVERFLOW once 33-bit inode numbers are reached.
231 To override this configured default, use the inode32 or inode64
232 option when mounting.
236 config ARCH_SUPPORTS_HUGETLBFS
240 bool "HugeTLB file system support"
241 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
242 depends on (SYSFS || SYSCTL)
244 hugetlbfs is a filesystem backing for HugeTLB pages, based on
245 ramfs. For architectures that support it, say Y here and read
246 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
253 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
254 def_bool HUGETLB_PAGE
255 depends on ARCH_WANT_OPTIMIZE_VMEMMAP
256 depends on SPARSEMEM_VMEMMAP
258 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
259 bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
261 depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
263 The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to
264 enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
265 (boot command line) or hugetlb_optimize_vmemmap (sysctl).
268 def_bool TMPFS || HUGETLBFS
270 config ARCH_HAS_GIGANTIC_PAGE
273 source "fs/configfs/Kconfig"
274 source "fs/efivarfs/Kconfig"
278 menuconfig MISC_FILESYSTEMS
279 bool "Miscellaneous filesystems"
282 Say Y here to get to see options for various miscellaneous
283 filesystems, such as filesystems that came from other
286 This option alone does not add any kernel code.
288 If you say N, all options in this submenu will be skipped and
289 disabled; if unsure, say Y here.
293 source "fs/orangefs/Kconfig"
294 source "fs/adfs/Kconfig"
295 source "fs/affs/Kconfig"
296 source "fs/ecryptfs/Kconfig"
297 source "fs/hfs/Kconfig"
298 source "fs/hfsplus/Kconfig"
299 source "fs/befs/Kconfig"
300 source "fs/bfs/Kconfig"
301 source "fs/efs/Kconfig"
302 source "fs/jffs2/Kconfig"
303 # UBIFS File system configuration
304 source "fs/ubifs/Kconfig"
305 source "fs/cramfs/Kconfig"
306 source "fs/squashfs/Kconfig"
307 source "fs/freevxfs/Kconfig"
308 source "fs/minix/Kconfig"
309 source "fs/omfs/Kconfig"
310 source "fs/hpfs/Kconfig"
311 source "fs/qnx4/Kconfig"
312 source "fs/qnx6/Kconfig"
313 source "fs/romfs/Kconfig"
314 source "fs/pstore/Kconfig"
315 source "fs/sysv/Kconfig"
316 source "fs/ufs/Kconfig"
317 source "fs/erofs/Kconfig"
318 source "fs/vboxsf/Kconfig"
320 endif # MISC_FILESYSTEMS
322 menuconfig NETWORK_FILESYSTEMS
323 bool "Network File Systems"
327 Say Y here to get to see options for network filesystems and
328 filesystem-related networking code, such as NFS daemon and
329 RPCSEC security modules.
331 This option alone does not add any kernel code.
333 If you say N, all options in this submenu will be skipped and
334 disabled; if unsure, say Y here.
336 if NETWORK_FILESYSTEMS
338 source "fs/nfs/Kconfig"
339 source "fs/nfsd/Kconfig"
346 depends on FILE_LOCKING
351 depends on NFSD || NFS_V3
352 depends on FILE_LOCKING
355 config NFS_ACL_SUPPORT
361 depends on NFSD || NFS_FS || LOCKD
364 config NFS_V4_2_SSC_HELPER
366 default y if NFS_V4_2
368 source "net/sunrpc/Kconfig"
369 source "fs/ceph/Kconfig"
371 source "fs/cifs/Kconfig"
372 source "fs/ksmbd/Kconfig"
376 default y if CIFS=y || SMB_SERVER=y
377 default m if CIFS=m || SMB_SERVER=m
379 source "fs/coda/Kconfig"
380 source "fs/afs/Kconfig"
381 source "fs/9p/Kconfig"
383 endif # NETWORK_FILESYSTEMS
385 source "fs/nls/Kconfig"
386 source "fs/dlm/Kconfig"
387 source "fs/unicode/Kconfig"