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 config MANDATORY_FILE_LOCKING
120 bool "Enable Mandatory file locking"
121 depends on FILE_LOCKING
124 This option enables files appropriately marked files on appropriely
125 mounted filesystems to support mandatory locking.
127 To the best of my knowledge this is dead code that no one cares about.
129 source "fs/crypto/Kconfig"
131 source "fs/verity/Kconfig"
133 source "fs/notify/Kconfig"
135 source "fs/quota/Kconfig"
137 source "fs/autofs/Kconfig"
138 source "fs/fuse/Kconfig"
139 source "fs/overlayfs/Kconfig"
143 source "fs/netfs/Kconfig"
144 source "fs/fscache/Kconfig"
145 source "fs/cachefiles/Kconfig"
150 menu "CD-ROM/DVD Filesystems"
152 source "fs/isofs/Kconfig"
153 source "fs/udf/Kconfig"
159 menu "DOS/FAT/EXFAT/NT Filesystems"
161 source "fs/fat/Kconfig"
162 source "fs/exfat/Kconfig"
163 source "fs/ntfs/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)"
178 Tmpfs is a file system which keeps all files in virtual memory.
180 Everything in tmpfs is temporary in the sense that no files will be
181 created on your hard drive. The files live in memory and swap
182 space. If you unmount a tmpfs instance, everything stored therein is
185 See <file:Documentation/filesystems/tmpfs.rst> for details.
187 config TMPFS_POSIX_ACL
188 bool "Tmpfs POSIX Access Control Lists"
193 POSIX Access Control Lists (ACLs) support additional access rights
194 for users and groups beyond the standard owner/group/world scheme,
195 and this option selects support for ACLs specifically for tmpfs
198 If you've selected TMPFS, it's possible that you'll also need
199 this option as there are a number of Linux distros that require
200 POSIX ACL support under /dev for certain features to work properly.
201 For example, some distros need this feature for ALSA-related /dev
202 files for sound to work properly. In short, if you're not sure,
206 bool "Tmpfs extended attributes"
210 Extended attributes are name:value pairs associated with inodes by
211 the kernel or by users (see the attr(5) manual page for details).
213 Currently this enables support for the trusted.* and
214 security.* namespaces.
216 You need this for POSIX ACL support on tmpfs.
221 bool "Use 64-bit ino_t by default in tmpfs"
222 depends on TMPFS && 64BIT
225 tmpfs has historically used only inode numbers as wide as an unsigned
226 int. In some cases this can cause wraparound, potentially resulting
227 in multiple files with the same inode number on a single device. This
228 option makes tmpfs use the full width of ino_t by default, without
229 needing to specify the inode64 option when mounting.
231 But if a long-lived tmpfs is to be accessed by 32-bit applications so
232 ancient that opening a file larger than 2GiB fails with EINVAL, then
233 the INODE64 config option and inode64 mount option risk operations
234 failing with EOVERFLOW once 33-bit inode numbers are reached.
236 To override this configured default, use the inode32 or inode64
237 option when mounting.
241 config ARCH_SUPPORTS_HUGETLBFS
245 bool "HugeTLB file system support"
246 depends on X86 || IA64 || SPARC64 || (S390 && 64BIT) || \
247 ARCH_SUPPORTS_HUGETLBFS || BROKEN
249 hugetlbfs is a filesystem backing for HugeTLB pages, based on
250 ramfs. For architectures that support it, say Y here and read
251 <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
258 config HUGETLB_PAGE_FREE_VMEMMAP
259 def_bool HUGETLB_PAGE
261 depends on SPARSEMEM_VMEMMAP
263 config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
264 bool "Default freeing vmemmap pages of HugeTLB to on"
266 depends on HUGETLB_PAGE_FREE_VMEMMAP
268 When using HUGETLB_PAGE_FREE_VMEMMAP, the freeing unused vmemmap
269 pages associated with each HugeTLB page is default off. Say Y here
270 to enable freeing vmemmap pages of HugeTLB by default. It can then
271 be disabled on the command line via hugetlb_free_vmemmap=off.
274 def_bool TMPFS || HUGETLBFS
276 config ARCH_HAS_GIGANTIC_PAGE
279 source "fs/configfs/Kconfig"
280 source "fs/efivarfs/Kconfig"
284 menuconfig MISC_FILESYSTEMS
285 bool "Miscellaneous filesystems"
288 Say Y here to get to see options for various miscellaneous
289 filesystems, such as filesystems that came from other
292 This option alone does not add any kernel code.
294 If you say N, all options in this submenu will be skipped and
295 disabled; if unsure, say Y here.
299 source "fs/orangefs/Kconfig"
300 source "fs/adfs/Kconfig"
301 source "fs/affs/Kconfig"
302 source "fs/ecryptfs/Kconfig"
303 source "fs/hfs/Kconfig"
304 source "fs/hfsplus/Kconfig"
305 source "fs/befs/Kconfig"
306 source "fs/bfs/Kconfig"
307 source "fs/efs/Kconfig"
308 source "fs/jffs2/Kconfig"
309 # UBIFS File system configuration
310 source "fs/ubifs/Kconfig"
311 source "fs/cramfs/Kconfig"
312 source "fs/squashfs/Kconfig"
313 source "fs/freevxfs/Kconfig"
314 source "fs/minix/Kconfig"
315 source "fs/omfs/Kconfig"
316 source "fs/hpfs/Kconfig"
317 source "fs/qnx4/Kconfig"
318 source "fs/qnx6/Kconfig"
319 source "fs/romfs/Kconfig"
320 source "fs/pstore/Kconfig"
321 source "fs/sysv/Kconfig"
322 source "fs/ufs/Kconfig"
323 source "fs/erofs/Kconfig"
324 source "fs/vboxsf/Kconfig"
326 endif # MISC_FILESYSTEMS
328 menuconfig NETWORK_FILESYSTEMS
329 bool "Network File Systems"
333 Say Y here to get to see options for network filesystems and
334 filesystem-related networking code, such as NFS daemon and
335 RPCSEC security modules.
337 This option alone does not add any kernel code.
339 If you say N, all options in this submenu will be skipped and
340 disabled; if unsure, say Y here.
342 if NETWORK_FILESYSTEMS
344 source "fs/nfs/Kconfig"
345 source "fs/nfsd/Kconfig"
352 depends on FILE_LOCKING
357 depends on NFSD_V3 || NFS_V3
358 depends on FILE_LOCKING
361 config NFS_ACL_SUPPORT
367 depends on NFSD || NFS_FS || LOCKD
370 config NFS_V4_2_SSC_HELPER
372 default y if NFS_V4_2
374 source "net/sunrpc/Kconfig"
375 source "fs/ceph/Kconfig"
376 source "fs/cifs/Kconfig"
377 source "fs/coda/Kconfig"
378 source "fs/afs/Kconfig"
379 source "fs/9p/Kconfig"
381 endif # NETWORK_FILESYSTEMS
383 source "fs/nls/Kconfig"
384 source "fs/dlm/Kconfig"
385 source "fs/unicode/Kconfig"