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"
46 bool "File system based Direct Access (DAX) support"
48 depends on !(ARM || MIPS || SPARC)
49 select DEV_PAGEMAP_OPS if (ZONE_DEVICE && !FS_DAX_LIMITED)
53 Direct Access (DAX) can be used on memory-backed block devices.
54 If the block device supports DAX and the filesystem supports DAX,
55 then you can avoid using the pagecache to buffer I/Os. Turning
56 on this option will compile in support for DAX.
58 For a DAX device to support file system access it needs to have
59 struct pages. For the nfit based NVDIMMs this can be enabled
60 using the ndctl utility:
62 # ndctl create-namespace --force --reconfig=namespace0.0 \
63 --mode=fsdax --map=mem
65 See the 'create-namespace' man page for details on the overhead of
67 https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
69 For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
70 file systems DAX support needs to be manually enabled globally or
71 per-inode using a mount option as well. See the file documentation in
72 Documentation/filesystems/dax.rst for details.
74 If you do not have a block device that is capable of using this,
75 or if unsure, say N. Saying Y will increase the size of the kernel
82 depends on ZONE_DEVICE
83 depends on TRANSPARENT_HUGEPAGE
85 # Selected by DAX drivers that do not expect filesystem DAX to support
86 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
87 # for fork() of processes with MAP_SHARED mappings or support for
88 # 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"
132 tristate "UID/GID shifting overlay filesystem for containers"
134 This filesystem can overlay any mounted filesystem and shift
135 the uid/gid the files appear at. The idea is that
136 unprivileged containers can use this to mount root volumes
137 using this technique.
139 config SHIFT_FS_POSIX_ACL
140 bool "shiftfs POSIX Access Control Lists"
144 POSIX Access Control Lists (ACLs) support permissions for users and
145 groups beyond the owner/group/world scheme.
147 If you don't know what Access Control Lists are, say N.
151 source "fs/netfs/Kconfig"
152 source "fs/fscache/Kconfig"
153 source "fs/cachefiles/Kconfig"
158 menu "CD-ROM/DVD Filesystems"
160 source "fs/isofs/Kconfig"
161 source "fs/udf/Kconfig"
167 menu "DOS/FAT/EXFAT/NT Filesystems"
169 source "fs/fat/Kconfig"
170 source "fs/exfat/Kconfig"
171 source "fs/ntfs/Kconfig"
172 source "fs/ntfs3/Kconfig"
177 menu "Pseudo filesystems"
179 source "fs/proc/Kconfig"
180 source "fs/kernfs/Kconfig"
181 source "fs/sysfs/Kconfig"
184 bool "Tmpfs virtual memory file system support (former shm fs)"
187 Tmpfs is a file system which keeps all files in virtual memory.
189 Everything in tmpfs is temporary in the sense that no files will be
190 created on your hard drive. The files live in memory and swap
191 space. If you unmount a tmpfs instance, everything stored therein is
194 See <file:Documentation/filesystems/tmpfs.rst> for details.
196 config TMPFS_POSIX_ACL
197 bool "Tmpfs POSIX Access Control Lists"
202 POSIX Access Control Lists (ACLs) support additional access rights
203 for users and groups beyond the standard owner/group/world scheme,
204 and this option selects support for ACLs specifically for tmpfs
207 If you've selected TMPFS, it's possible that you'll also need
208 this option as there are a number of Linux distros that require
209 POSIX ACL support under /dev for certain features to work properly.
210 For example, some distros need this feature for ALSA-related /dev
211 files for sound to work properly. In short, if you're not sure,
215 bool "Tmpfs extended attributes"
219 Extended attributes are name:value pairs associated with inodes by
220 the kernel or by users (see the attr(5) manual page for details).
222 Currently this enables support for the trusted.* and
223 security.* namespaces.
225 You need this for POSIX ACL support on tmpfs.
230 bool "Use 64-bit ino_t by default in tmpfs"
231 depends on TMPFS && 64BIT
234 tmpfs has historically used only inode numbers as wide as an unsigned
235 int. In some cases this can cause wraparound, potentially resulting
236 in multiple files with the same inode number on a single device. This
237 option makes tmpfs use the full width of ino_t by default, without
238 needing to specify the inode64 option when mounting.
240 But if a long-lived tmpfs is to be accessed by 32-bit applications so
241 ancient that opening a file larger than 2GiB fails with EINVAL, then
242 the INODE64 config option and inode64 mount option risk operations
243 failing with EOVERFLOW once 33-bit inode numbers are reached.
245 To override this configured default, use the inode32 or inode64
246 option when mounting.
250 config ARCH_SUPPORTS_HUGETLBFS
254 bool "HugeTLB file system support"
255 depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
257 hugetlbfs is a filesystem backing for HugeTLB pages, based on
258 ramfs. For architectures that support it, say Y here and read
259 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
266 config HUGETLB_PAGE_FREE_VMEMMAP
267 def_bool HUGETLB_PAGE
269 depends on SPARSEMEM_VMEMMAP
271 config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
272 bool "Default freeing vmemmap pages of HugeTLB to on"
274 depends on HUGETLB_PAGE_FREE_VMEMMAP
276 When using HUGETLB_PAGE_FREE_VMEMMAP, the freeing unused vmemmap
277 pages associated with each HugeTLB page is default off. Say Y here
278 to enable freeing vmemmap pages of HugeTLB by default. It can then
279 be disabled on the command line via hugetlb_free_vmemmap=off.
282 def_bool TMPFS || HUGETLBFS
284 config ARCH_HAS_GIGANTIC_PAGE
287 source "fs/configfs/Kconfig"
288 source "fs/efivarfs/Kconfig"
292 menuconfig MISC_FILESYSTEMS
293 bool "Miscellaneous filesystems"
296 Say Y here to get to see options for various miscellaneous
297 filesystems, such as filesystems that came from other
300 This option alone does not add any kernel code.
302 If you say N, all options in this submenu will be skipped and
303 disabled; if unsure, say Y here.
307 source "fs/orangefs/Kconfig"
308 source "fs/adfs/Kconfig"
309 source "fs/affs/Kconfig"
310 source "fs/ecryptfs/Kconfig"
311 source "fs/hfs/Kconfig"
312 source "fs/hfsplus/Kconfig"
313 source "fs/befs/Kconfig"
314 source "fs/bfs/Kconfig"
315 source "fs/efs/Kconfig"
316 source "fs/jffs2/Kconfig"
317 # UBIFS File system configuration
318 source "fs/ubifs/Kconfig"
319 source "fs/cramfs/Kconfig"
320 source "fs/squashfs/Kconfig"
321 source "fs/freevxfs/Kconfig"
322 source "fs/minix/Kconfig"
323 source "fs/omfs/Kconfig"
324 source "fs/hpfs/Kconfig"
325 source "fs/qnx4/Kconfig"
326 source "fs/qnx6/Kconfig"
327 source "fs/romfs/Kconfig"
328 source "fs/pstore/Kconfig"
329 source "fs/sysv/Kconfig"
330 source "fs/ufs/Kconfig"
331 source "fs/erofs/Kconfig"
332 source "fs/vboxsf/Kconfig"
334 endif # MISC_FILESYSTEMS
336 menuconfig NETWORK_FILESYSTEMS
337 bool "Network File Systems"
341 Say Y here to get to see options for network filesystems and
342 filesystem-related networking code, such as NFS daemon and
343 RPCSEC security modules.
345 This option alone does not add any kernel code.
347 If you say N, all options in this submenu will be skipped and
348 disabled; if unsure, say Y here.
350 if NETWORK_FILESYSTEMS
352 source "fs/nfs/Kconfig"
353 source "fs/nfsd/Kconfig"
360 depends on FILE_LOCKING
365 depends on NFSD_V3 || NFS_V3
366 depends on FILE_LOCKING
369 config NFS_ACL_SUPPORT
375 depends on NFSD || NFS_FS || LOCKD
378 config NFS_V4_2_SSC_HELPER
380 default y if NFS_V4_2
382 source "net/sunrpc/Kconfig"
383 source "fs/ceph/Kconfig"
385 source "fs/cifs/Kconfig"
386 source "fs/ksmbd/Kconfig"
393 source "fs/coda/Kconfig"
394 source "fs/afs/Kconfig"
395 source "fs/9p/Kconfig"
397 endif # NETWORK_FILESYSTEMS
399 source "fs/nls/Kconfig"
400 source "fs/dlm/Kconfig"
401 source "fs/unicode/Kconfig"