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.
23 source "fs/ext2/Kconfig"
24 source "fs/ext4/Kconfig"
25 source "fs/jbd2/Kconfig"
28 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
30 default y if EXT2_FS=y && EXT2_FS_XATTR
31 default y if EXT4_FS=y
32 default m if EXT2_FS_XATTR || EXT4_FS
34 source "fs/reiserfs/Kconfig"
35 source "fs/jfs/Kconfig"
37 source "fs/xfs/Kconfig"
38 source "fs/gfs2/Kconfig"
39 source "fs/ocfs2/Kconfig"
40 source "fs/btrfs/Kconfig"
41 source "fs/nilfs2/Kconfig"
42 source "fs/f2fs/Kconfig"
43 source "fs/zonefs/Kconfig"
48 bool "File system based Direct Access (DAX) support"
50 depends on !(ARM || MIPS || SPARC)
51 depends on ZONE_DEVICE || FS_DAX_LIMITED
55 Direct Access (DAX) can be used on memory-backed block devices.
56 If the block device supports DAX and the filesystem supports DAX,
57 then you can avoid using the pagecache to buffer I/Os. Turning
58 on this option will compile in support for DAX.
60 For a DAX device to support file system access it needs to have
61 struct pages. For the nfit based NVDIMMs this can be enabled
62 using the ndctl utility:
64 # ndctl create-namespace --force --reconfig=namespace0.0 \
65 --mode=fsdax --map=mem
67 See the 'create-namespace' man page for details on the overhead of
69 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
71 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
72 file systems DAX support needs to be manually enabled globally or
73 per-inode using a mount option as well. See the file documentation in
74 Documentation/filesystems/dax.rst for details.
76 If you do not have a block device that is capable of using this,
77 or if unsure, say N. Saying Y will increase the size of the kernel
84 depends on ZONE_DEVICE
85 depends on TRANSPARENT_HUGEPAGE
87 # Selected by DAX drivers that do not expect filesystem DAX to support
88 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
89 # for fork() of processes with MAP_SHARED mappings or support for
90 # direct-I/O to a DAX mapping.
94 # Posix ACL utility routines
96 # Note: Posix ACLs can be implemented without these helpers. Never use
97 # this symbol for ifdefs in core code.
105 config EXPORTFS_BLOCK_OPS
106 bool "Enable filesystem export operations for block IO"
108 This option enables the export operations for a filesystem to support
112 bool "Enable POSIX file locking API" if EXPERT
115 This option enables standard file locking support, required
116 for filesystems like NFS and for the flock() system
117 call. Disabling this option saves about 11k.
119 source "fs/crypto/Kconfig"
121 source "fs/verity/Kconfig"
123 source "fs/notify/Kconfig"
125 source "fs/quota/Kconfig"
127 source "fs/autofs/Kconfig"
128 source "fs/fuse/Kconfig"
129 source "fs/overlayfs/Kconfig"
133 source "fs/netfs/Kconfig"
134 source "fs/fscache/Kconfig"
135 source "fs/cachefiles/Kconfig"
140 menu "CD-ROM/DVD Filesystems"
142 source "fs/isofs/Kconfig"
143 source "fs/udf/Kconfig"
149 menu "DOS/FAT/EXFAT/NT Filesystems"
151 source "fs/fat/Kconfig"
152 source "fs/exfat/Kconfig"
153 source "fs/ntfs/Kconfig"
154 source "fs/ntfs3/Kconfig"
159 menu "Pseudo filesystems"
161 source "fs/proc/Kconfig"
162 source "fs/kernfs/Kconfig"
163 source "fs/sysfs/Kconfig"
166 bool "Tmpfs virtual memory file system support (former shm fs)"
169 Tmpfs is a file system which keeps all files in virtual memory.
171 Everything in tmpfs is temporary in the sense that no files will be
172 created on your hard drive. The files live in memory and swap
173 space. If you unmount a tmpfs instance, everything stored therein is
176 See <file:Documentation/filesystems/tmpfs.rst> for details.
178 config TMPFS_POSIX_ACL
179 bool "Tmpfs POSIX Access Control Lists"
184 POSIX Access Control Lists (ACLs) support additional access rights
185 for users and groups beyond the standard owner/group/world scheme,
186 and this option selects support for ACLs specifically for tmpfs
189 If you've selected TMPFS, it's possible that you'll also need
190 this option as there are a number of Linux distros that require
191 POSIX ACL support under /dev for certain features to work properly.
192 For example, some distros need this feature for ALSA-related /dev
193 files for sound to work properly. In short, if you're not sure,
197 bool "Tmpfs extended attributes"
201 Extended attributes are name:value pairs associated with inodes by
202 the kernel or by users (see the attr(5) manual page for details).
204 Currently this enables support for the trusted.* and
205 security.* namespaces.
207 You need this for POSIX ACL support on tmpfs.
212 bool "Use 64-bit ino_t by default in tmpfs"
213 depends on TMPFS && 64BIT
216 tmpfs has historically used only inode numbers as wide as an unsigned
217 int. In some cases this can cause wraparound, potentially resulting
218 in multiple files with the same inode number on a single device. This
219 option makes tmpfs use the full width of ino_t by default, without
220 needing to specify the inode64 option when mounting.
222 But if a long-lived tmpfs is to be accessed by 32-bit applications so
223 ancient that opening a file larger than 2GiB fails with EINVAL, then
224 the INODE64 config option and inode64 mount option risk operations
225 failing with EOVERFLOW once 33-bit inode numbers are reached.
227 To override this configured default, use the inode32 or inode64
228 option when mounting.
232 config ARCH_SUPPORTS_HUGETLBFS
236 bool "HugeTLB file system support"
237 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
239 hugetlbfs is a filesystem backing for HugeTLB pages, based on
240 ramfs. For architectures that support it, say Y here and read
241 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
248 config HUGETLB_PAGE_FREE_VMEMMAP
249 def_bool HUGETLB_PAGE
251 depends on SPARSEMEM_VMEMMAP
253 config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
254 bool "Default freeing vmemmap pages of HugeTLB to on"
256 depends on HUGETLB_PAGE_FREE_VMEMMAP
258 When using HUGETLB_PAGE_FREE_VMEMMAP, the freeing unused vmemmap
259 pages associated with each HugeTLB page is default off. Say Y here
260 to enable freeing vmemmap pages of HugeTLB by default. It can then
261 be disabled on the command line via hugetlb_free_vmemmap=off.
264 def_bool TMPFS || HUGETLBFS
266 config ARCH_HAS_GIGANTIC_PAGE
269 source "fs/configfs/Kconfig"
270 source "fs/efivarfs/Kconfig"
274 menuconfig MISC_FILESYSTEMS
275 bool "Miscellaneous filesystems"
278 Say Y here to get to see options for various miscellaneous
279 filesystems, such as filesystems that came from other
282 This option alone does not add any kernel code.
284 If you say N, all options in this submenu will be skipped and
285 disabled; if unsure, say Y here.
289 source "fs/orangefs/Kconfig"
290 source "fs/adfs/Kconfig"
291 source "fs/affs/Kconfig"
292 source "fs/ecryptfs/Kconfig"
293 source "fs/hfs/Kconfig"
294 source "fs/hfsplus/Kconfig"
295 source "fs/befs/Kconfig"
296 source "fs/bfs/Kconfig"
297 source "fs/efs/Kconfig"
298 source "fs/jffs2/Kconfig"
299 # UBIFS File system configuration
300 source "fs/ubifs/Kconfig"
301 source "fs/cramfs/Kconfig"
302 source "fs/squashfs/Kconfig"
303 source "fs/freevxfs/Kconfig"
304 source "fs/minix/Kconfig"
305 source "fs/omfs/Kconfig"
306 source "fs/hpfs/Kconfig"
307 source "fs/qnx4/Kconfig"
308 source "fs/qnx6/Kconfig"
309 source "fs/romfs/Kconfig"
310 source "fs/pstore/Kconfig"
311 source "fs/sysv/Kconfig"
312 source "fs/ufs/Kconfig"
313 source "fs/erofs/Kconfig"
314 source "fs/vboxsf/Kconfig"
316 endif # MISC_FILESYSTEMS
318 menuconfig NETWORK_FILESYSTEMS
319 bool "Network File Systems"
323 Say Y here to get to see options for network filesystems and
324 filesystem-related networking code, such as NFS daemon and
325 RPCSEC security modules.
327 This option alone does not add any kernel code.
329 If you say N, all options in this submenu will be skipped and
330 disabled; if unsure, say Y here.
332 if NETWORK_FILESYSTEMS
334 source "fs/nfs/Kconfig"
335 source "fs/nfsd/Kconfig"
342 depends on FILE_LOCKING
347 depends on NFSD_V3 || NFS_V3
348 depends on FILE_LOCKING
351 config NFS_ACL_SUPPORT
357 depends on NFSD || NFS_FS || LOCKD
360 config NFS_V4_2_SSC_HELPER
362 default y if NFS_V4_2
364 source "net/sunrpc/Kconfig"
365 source "fs/ceph/Kconfig"
367 source "fs/cifs/Kconfig"
368 source "fs/ksmbd/Kconfig"
372 default y if CIFS=y || SMB_SERVER=y
373 default m if CIFS=m || SMB_SERVER=m
375 source "fs/coda/Kconfig"
376 source "fs/afs/Kconfig"
377 source "fs/9p/Kconfig"
379 endif # NETWORK_FILESYSTEMS
381 source "fs/nls/Kconfig"
382 source "fs/dlm/Kconfig"
383 source "fs/unicode/Kconfig"