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TOMOYO Linux Cross Reference
Linux/fs/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0-only
  2 #
  3 # File system configuration
  4 #
  5 
  6 menu "File systems"
  7 
  8 # Use unaligned word dcache accesses
  9 config DCACHE_WORD_ACCESS
 10        bool
 11 
 12 config VALIDATE_FS_PARSER
 13         bool "Validate filesystem parameter description"
 14         help
 15           Enable this to perform validation of the parameter description for a
 16           filesystem when it is registered.
 17 
 18 config FS_IOMAP
 19         bool
 20 
 21 # Stackable filesystems
 22 config FS_STACK
 23         bool
 24 
 25 config BUFFER_HEAD
 26         bool
 27 
 28 # old blockdev_direct_IO implementation.  Use iomap for new code instead
 29 config LEGACY_DIRECT_IO
 30         depends on BUFFER_HEAD
 31         bool
 32 
 33 if BLOCK
 34 
 35 source "fs/ext2/Kconfig"
 36 source "fs/ext4/Kconfig"
 37 source "fs/jbd2/Kconfig"
 38 
 39 config FS_MBCACHE
 40 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
 41         tristate
 42         default y if EXT2_FS=y && EXT2_FS_XATTR
 43         default y if EXT4_FS=y
 44         default m if EXT2_FS_XATTR || EXT4_FS
 45 
 46 source "fs/reiserfs/Kconfig"
 47 source "fs/jfs/Kconfig"
 48 
 49 source "fs/xfs/Kconfig"
 50 source "fs/gfs2/Kconfig"
 51 source "fs/ocfs2/Kconfig"
 52 source "fs/btrfs/Kconfig"
 53 source "fs/nilfs2/Kconfig"
 54 source "fs/f2fs/Kconfig"
 55 source "fs/bcachefs/Kconfig"
 56 source "fs/zonefs/Kconfig"
 57 
 58 endif # BLOCK
 59 
 60 config FS_DAX
 61         bool "File system based Direct Access (DAX) support"
 62         depends on MMU
 63         depends on ZONE_DEVICE || FS_DAX_LIMITED
 64         select FS_IOMAP
 65         select DAX
 66         help
 67           Direct Access (DAX) can be used on memory-backed block devices.
 68           If the block device supports DAX and the filesystem supports DAX,
 69           then you can avoid using the pagecache to buffer I/Os.  Turning
 70           on this option will compile in support for DAX.
 71 
 72           For a DAX device to support file system access it needs to have
 73           struct pages.  For the nfit based NVDIMMs this can be enabled
 74           using the ndctl utility:
 75 
 76                 # ndctl create-namespace --force --reconfig=namespace0.0 \
 77                         --mode=fsdax --map=mem
 78 
 79           See the 'create-namespace' man page for details on the overhead of
 80           --map=mem:
 81           https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace
 82 
 83           For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
 84           file systems DAX support needs to be manually enabled globally or
 85           per-inode using a mount option as well.  See the file documentation in
 86           Documentation/filesystems/dax.rst for details.
 87 
 88           If you do not have a block device that is capable of using this,
 89           or if unsure, say N.  Saying Y will increase the size of the kernel
 90           by about 5kB.
 91 
 92 config FS_DAX_PMD
 93         bool
 94         default FS_DAX
 95         depends on FS_DAX
 96         depends on ZONE_DEVICE
 97         depends on TRANSPARENT_HUGEPAGE
 98 
 99 # Selected by DAX drivers that do not expect filesystem DAX to support
100 # get_user_pages() of DAX mappings. I.e. "limited" indicates no support
101 # for fork() of processes with MAP_SHARED mappings or support for
102 # direct-I/O to a DAX mapping.
103 config FS_DAX_LIMITED
104         bool
105 
106 # Posix ACL utility routines
107 #
108 # Note: Posix ACLs can be implemented without these helpers.  Never use
109 # this symbol for ifdefs in core code.
110 #
111 config FS_POSIX_ACL
112         def_bool n
113 
114 config EXPORTFS
115         tristate
116 
117 config EXPORTFS_BLOCK_OPS
118         bool "Enable filesystem export operations for block IO"
119         help
120           This option enables the export operations for a filesystem to support
121           external block IO.
122 
123 config FILE_LOCKING
124         bool "Enable POSIX file locking API" if EXPERT
125         default y
126         help
127           This option enables standard file locking support, required
128           for filesystems like NFS and for the flock() system
129           call. Disabling this option saves about 11k.
130 
131 source "fs/crypto/Kconfig"
132 
133 source "fs/verity/Kconfig"
134 
135 source "fs/notify/Kconfig"
136 
137 source "fs/quota/Kconfig"
138 
139 source "fs/autofs/Kconfig"
140 source "fs/fuse/Kconfig"
141 source "fs/overlayfs/Kconfig"
142 
143 menu "Caches"
144 
145 source "fs/netfs/Kconfig"
146 source "fs/cachefiles/Kconfig"
147 
148 endmenu
149 
150 if BLOCK
151 menu "CD-ROM/DVD Filesystems"
152 
153 source "fs/isofs/Kconfig"
154 source "fs/udf/Kconfig"
155 
156 endmenu
157 endif # BLOCK
158 
159 if BLOCK
160 menu "DOS/FAT/EXFAT/NT Filesystems"
161 
162 source "fs/fat/Kconfig"
163 source "fs/exfat/Kconfig"
164 source "fs/ntfs3/Kconfig"
165 
166 endmenu
167 endif # BLOCK
168 
169 menu "Pseudo filesystems"
170 
171 source "fs/proc/Kconfig"
172 source "fs/kernfs/Kconfig"
173 source "fs/sysfs/Kconfig"
174 
175 config TMPFS
176         bool "Tmpfs virtual memory file system support (former shm fs)"
177         depends on SHMEM
178         select MEMFD_CREATE
179         help
180           Tmpfs is a file system which keeps all files in virtual memory.
181 
182           Everything in tmpfs is temporary in the sense that no files will be
183           created on your hard drive. The files live in memory and swap
184           space. If you unmount a tmpfs instance, everything stored therein is
185           lost.
186 
187           See <file:Documentation/filesystems/tmpfs.rst> for details.
188 
189 config TMPFS_POSIX_ACL
190         bool "Tmpfs POSIX Access Control Lists"
191         depends on TMPFS
192         select TMPFS_XATTR
193         select FS_POSIX_ACL
194         help
195           POSIX Access Control Lists (ACLs) support additional access rights
196           for users and groups beyond the standard owner/group/world scheme,
197           and this option selects support for ACLs specifically for tmpfs
198           filesystems.
199 
200           If you've selected TMPFS, it's possible that you'll also need
201           this option as there are a number of Linux distros that require
202           POSIX ACL support under /dev for certain features to work properly.
203           For example, some distros need this feature for ALSA-related /dev
204           files for sound to work properly.  In short, if you're not sure,
205           say Y.
206 
207 config TMPFS_XATTR
208         bool "Tmpfs extended attributes"
209         depends on TMPFS
210         default n
211         help
212           Extended attributes are name:value pairs associated with inodes by
213           the kernel or by users (see the attr(5) manual page for details).
214 
215           This enables support for the trusted.*, security.* and user.*
216           namespaces.
217 
218           You need this for POSIX ACL support on tmpfs.
219 
220           If unsure, say N.
221 
222 config TMPFS_INODE64
223         bool "Use 64-bit ino_t by default in tmpfs"
224         depends on TMPFS && 64BIT
225         default n
226         help
227           tmpfs has historically used only inode numbers as wide as an unsigned
228           int. In some cases this can cause wraparound, potentially resulting
229           in multiple files with the same inode number on a single device. This
230           option makes tmpfs use the full width of ino_t by default, without
231           needing to specify the inode64 option when mounting.
232 
233           But if a long-lived tmpfs is to be accessed by 32-bit applications so
234           ancient that opening a file larger than 2GiB fails with EINVAL, then
235           the INODE64 config option and inode64 mount option risk operations
236           failing with EOVERFLOW once 33-bit inode numbers are reached.
237 
238           To override this configured default, use the inode32 or inode64
239           option when mounting.
240 
241           If unsure, say N.
242 
243 config TMPFS_QUOTA
244         bool "Tmpfs quota support"
245         depends on TMPFS
246         select QUOTA
247         help
248           Quota support allows to set per user and group limits for tmpfs
249           usage.  Say Y to enable quota support. Once enabled you can control
250           user and group quota enforcement with quota, usrquota and grpquota
251           mount options.
252 
253           If unsure, say N.
254 
255 config ARCH_SUPPORTS_HUGETLBFS
256         def_bool n
257 
258 menuconfig HUGETLBFS
259         bool "HugeTLB file system support"
260         depends on X86 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
261         depends on (SYSFS || SYSCTL)
262         select MEMFD_CREATE
263         select PADATA if SMP
264         help
265           hugetlbfs is a filesystem backing for HugeTLB pages, based on
266           ramfs. For architectures that support it, say Y here and read
267           <file:Documentation/admin-guide/mm/hugetlbpage.rst> for details.
268 
269           If unsure, say N.
270 
271 if HUGETLBFS
272 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
273         bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
274         default n
275         depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
276         help
277           The HugeTLB Vmemmap Optimization (HVO) defaults to off. Say Y here to
278           enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
279           (boot command line) or hugetlb_optimize_vmemmap (sysctl).
280 endif # HUGETLBFS
281 
282 config HUGETLB_PAGE
283         def_bool HUGETLBFS
284         select XARRAY_MULTI
285 
286 config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
287         def_bool HUGETLB_PAGE
288         depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
289         depends on SPARSEMEM_VMEMMAP
290 
291 config ARCH_HAS_GIGANTIC_PAGE
292         bool
293 
294 source "fs/configfs/Kconfig"
295 source "fs/efivarfs/Kconfig"
296 
297 endmenu
298 
299 menuconfig MISC_FILESYSTEMS
300         bool "Miscellaneous filesystems"
301         default y
302         help
303           Say Y here to get to see options for various miscellaneous
304           filesystems, such as filesystems that came from other
305           operating systems.
306 
307           This option alone does not add any kernel code.
308 
309           If you say N, all options in this submenu will be skipped and
310           disabled; if unsure, say Y here.
311 
312 if MISC_FILESYSTEMS
313 
314 source "fs/orangefs/Kconfig"
315 source "fs/adfs/Kconfig"
316 source "fs/affs/Kconfig"
317 source "fs/ecryptfs/Kconfig"
318 source "fs/hfs/Kconfig"
319 source "fs/hfsplus/Kconfig"
320 source "fs/befs/Kconfig"
321 source "fs/bfs/Kconfig"
322 source "fs/efs/Kconfig"
323 source "fs/jffs2/Kconfig"
324 # UBIFS File system configuration
325 source "fs/ubifs/Kconfig"
326 source "fs/cramfs/Kconfig"
327 source "fs/squashfs/Kconfig"
328 source "fs/freevxfs/Kconfig"
329 source "fs/minix/Kconfig"
330 source "fs/omfs/Kconfig"
331 source "fs/hpfs/Kconfig"
332 source "fs/qnx4/Kconfig"
333 source "fs/qnx6/Kconfig"
334 source "fs/romfs/Kconfig"
335 source "fs/pstore/Kconfig"
336 source "fs/sysv/Kconfig"
337 source "fs/ufs/Kconfig"
338 source "fs/erofs/Kconfig"
339 source "fs/vboxsf/Kconfig"
340 
341 endif # MISC_FILESYSTEMS
342 
343 menuconfig NETWORK_FILESYSTEMS
344         bool "Network File Systems"
345         default y
346         depends on NET
347         help
348           Say Y here to get to see options for network filesystems and
349           filesystem-related networking code, such as NFS daemon and
350           RPCSEC security modules.
351 
352           This option alone does not add any kernel code.
353 
354           If you say N, all options in this submenu will be skipped and
355           disabled; if unsure, say Y here.
356 
357 if NETWORK_FILESYSTEMS
358 
359 source "fs/nfs/Kconfig"
360 source "fs/nfsd/Kconfig"
361 
362 config GRACE_PERIOD
363         tristate
364 
365 config LOCKD
366         tristate
367         depends on FILE_LOCKING
368         select GRACE_PERIOD
369 
370 config LOCKD_V4
371         bool
372         depends on NFSD || NFS_V3
373         depends on FILE_LOCKING
374         default y
375 
376 config NFS_ACL_SUPPORT
377         tristate
378         select FS_POSIX_ACL
379 
380 config NFS_COMMON
381         bool
382         depends on NFSD || NFS_FS || LOCKD
383         default y
384 
385 config NFS_V4_2_SSC_HELPER
386         bool
387         default y if NFS_V4_2
388 
389 source "net/sunrpc/Kconfig"
390 source "fs/ceph/Kconfig"
391 
392 source "fs/smb/Kconfig"
393 source "fs/coda/Kconfig"
394 source "fs/afs/Kconfig"
395 source "fs/9p/Kconfig"
396 
397 endif # NETWORK_FILESYSTEMS
398 
399 source "fs/nls/Kconfig"
400 source "fs/dlm/Kconfig"
401 source "fs/unicode/Kconfig"
402 
403 config IO_WQ
404         bool
405 
406 endmenu

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