linux-yocto/fs/Kconfig

SPDX-License-Identifier: GPL-2.0-only

File system configuration

menu "File systems"

Use unaligned word dcache accesses

config DCACHE_WORD_ACCESS bool

config VALIDATE_FS_PARSER bool "Validate filesystem parameter description" help Enable this to perform validation of the parameter description for a filesystem when it is registered.

config FS_IOMAP bool

if BLOCK

source "fs/ext2/Kconfig" source "fs/ext4/Kconfig" source "fs/jbd2/Kconfig"

config FS_MBCACHE

Meta block cache for Extended Attributes (ext2/ext3/ext4)

tristate
default y if EXT2_FS=y && EXT2_FS_XATTR
default y if EXT4_FS=y
default m if EXT2_FS_XATTR || EXT4_FS

source "fs/reiserfs/Kconfig" source "fs/jfs/Kconfig"

source "fs/xfs/Kconfig" source "fs/gfs2/Kconfig" source "fs/ocfs2/Kconfig" source "fs/btrfs/Kconfig" source "fs/nilfs2/Kconfig" source "fs/f2fs/Kconfig" source "fs/zonefs/Kconfig"

endif # BLOCK

config FS_DAX bool "File system based Direct Access (DAX) support" depends on MMU depends on !(ARM || MIPS || SPARC) depends on ZONE_DEVICE || FS_DAX_LIMITED select FS_IOMAP select DAX help Direct Access (DAX) can be used on memory-backed block devices. If the block device supports DAX and the filesystem supports DAX, then you can avoid using the pagecache to buffer I/Os. Turning on this option will compile in support for DAX.

  For a DAX device to support file system access it needs to have
  struct pages.  For the nfit based NVDIMMs this can be enabled
  using the ndctl utility:

	# ndctl create-namespace --force --reconfig=namespace0.0 \
		--mode=fsdax --map=mem

  See the 'create-namespace' man page for details on the overhead of
  --map=mem:
  https://docs.pmem.io/ndctl-user-guide/ndctl-man-pages/ndctl-create-namespace

      For ndctl to work CONFIG_DEV_DAX needs to be enabled as well. For most
  file systems DAX support needs to be manually enabled globally or
  per-inode using a mount option as well.  See the file documentation in
  Documentation/filesystems/dax.rst for details.

  If you do not have a block device that is capable of using this,
  or if unsure, say N.  Saying Y will increase the size of the kernel
  by about 5kB.

config FS_DAX_PMD bool default FS_DAX depends on FS_DAX depends on ZONE_DEVICE depends on TRANSPARENT_HUGEPAGE

Selected by DAX drivers that do not expect filesystem DAX to support

get_user_pages() of DAX mappings. I.e. "limited" indicates no support

for fork() of processes with MAP_SHARED mappings or support for

direct-I/O to a DAX mapping.

config FS_DAX_LIMITED bool

Posix ACL utility routines

Note: Posix ACLs can be implemented without these helpers. Never use

this symbol for ifdefs in core code.

config FS_POSIX_ACL def_bool n

config EXPORTFS tristate

config EXPORTFS_BLOCK_OPS bool "Enable filesystem export operations for block IO" help This option enables the export operations for a filesystem to support external block IO.

config FILE_LOCKING bool "Enable POSIX file locking API" if EXPERT default y help This option enables standard file locking support, required for filesystems like NFS and for the flock() system call. Disabling this option saves about 11k.

source "fs/crypto/Kconfig"

source "fs/verity/Kconfig"

source "fs/notify/Kconfig"

source "fs/quota/Kconfig"

source "fs/autofs/Kconfig" source "fs/fuse/Kconfig" source "fs/overlayfs/Kconfig"

menu "Caches"

source "fs/netfs/Kconfig" source "fs/fscache/Kconfig" source "fs/cachefiles/Kconfig"

endmenu

if BLOCK menu "CD-ROM/DVD Filesystems"

source "fs/isofs/Kconfig" source "fs/udf/Kconfig"

endmenu endif # BLOCK

if BLOCK menu "DOS/FAT/EXFAT/NT Filesystems"

source "fs/fat/Kconfig" source "fs/exfat/Kconfig" source "fs/ntfs/Kconfig" source "fs/ntfs3/Kconfig"

endmenu endif # BLOCK

menu "Pseudo filesystems"

source "fs/proc/Kconfig" source "fs/kernfs/Kconfig" source "fs/sysfs/Kconfig"

config TMPFS bool "Tmpfs virtual memory file system support (former shm fs)" depends on SHMEM help Tmpfs is a file system which keeps all files in virtual memory.

  Everything in tmpfs is temporary in the sense that no files will be
  created on your hard drive. The files live in memory and swap
  space. If you unmount a tmpfs instance, everything stored therein is
  lost.

  See <file:Documentation/filesystems/tmpfs.rst> for details.

config TMPFS_POSIX_ACL bool "Tmpfs POSIX Access Control Lists" depends on TMPFS select TMPFS_XATTR select FS_POSIX_ACL help POSIX Access Control Lists (ACLs) support additional access rights for users and groups beyond the standard owner/group/world scheme, and this option selects support for ACLs specifically for tmpfs filesystems.

  If you've selected TMPFS, it's possible that you'll also need
  this option as there are a number of Linux distros that require
  POSIX ACL support under /dev for certain features to work properly.
  For example, some distros need this feature for ALSA-related /dev
  files for sound to work properly.  In short, if you're not sure,
  say Y.

config TMPFS_XATTR bool "Tmpfs extended attributes" depends on TMPFS default n help Extended attributes are name:value pairs associated with inodes by the kernel or by users (see the attr(5) manual page for details).

  Currently this enables support for the trusted.* and
  security.* namespaces.

  You need this for POSIX ACL support on tmpfs.

  If unsure, say N.

config TMPFS_INODE64 bool "Use 64-bit ino_t by default in tmpfs" depends on TMPFS && 64BIT default n help tmpfs has historically used only inode numbers as wide as an unsigned int. In some cases this can cause wraparound, potentially resulting in multiple files with the same inode number on a single device. This option makes tmpfs use the full width of ino_t by default, without needing to specify the inode64 option when mounting.

  But if a long-lived tmpfs is to be accessed by 32-bit applications so
  ancient that opening a file larger than 2GiB fails with EINVAL, then
  the INODE64 config option and inode64 mount option risk operations
  failing with EOVERFLOW once 33-bit inode numbers are reached.

  To override this configured default, use the inode32 or inode64
  option when mounting.

  If unsure, say N.

config ARCH_SUPPORTS_HUGETLBFS def_bool n

config HUGETLBFS bool "HugeTLB file system support" depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN depends on (SYSFS || SYSCTL) help hugetlbfs is a filesystem backing for HugeTLB pages, based on ramfs. For architectures that support it, say Y here and read file:Documentation/admin-guide/mm/hugetlbpage.rst for details.

  If unsure, say N.

config HUGETLB_PAGE def_bool HUGETLBFS

Select this config option from the architecture Kconfig, if it is preferred

to enable the feature of HugeTLB Vmemmap Optimization (HVO).

config ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP bool

config HUGETLB_PAGE_OPTIMIZE_VMEMMAP def_bool HUGETLB_PAGE depends on ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP depends on SPARSEMEM_VMEMMAP

config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON bool "HugeTLB Vmemmap Optimization (HVO) defaults to on" default n depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP help The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off (boot command line) or hugetlb_optimize_vmemmap (sysctl).

config MEMFD_CREATE def_bool TMPFS || HUGETLBFS

config ARCH_HAS_GIGANTIC_PAGE bool

source "fs/configfs/Kconfig" source "fs/efivarfs/Kconfig"

endmenu

menuconfig MISC_FILESYSTEMS bool "Miscellaneous filesystems" default y help Say Y here to get to see options for various miscellaneous filesystems, such as filesystems that came from other operating systems.

  This option alone does not add any kernel code.

  If you say N, all options in this submenu will be skipped and
  disabled; if unsure, say Y here.

if MISC_FILESYSTEMS

source "fs/orangefs/Kconfig" source "fs/adfs/Kconfig" source "fs/affs/Kconfig" source "fs/ecryptfs/Kconfig" source "fs/hfs/Kconfig" source "fs/hfsplus/Kconfig" source "fs/befs/Kconfig" source "fs/bfs/Kconfig" source "fs/efs/Kconfig" source "fs/jffs2/Kconfig"

UBIFS File system configuration

source "fs/ubifs/Kconfig" source "fs/cramfs/Kconfig" source "fs/squashfs/Kconfig" source "fs/freevxfs/Kconfig" source "fs/minix/Kconfig" source "fs/omfs/Kconfig" source "fs/hpfs/Kconfig" source "fs/qnx4/Kconfig" source "fs/qnx6/Kconfig" source "fs/romfs/Kconfig" source "fs/pstore/Kconfig" source "fs/sysv/Kconfig" source "fs/ufs/Kconfig" source "fs/erofs/Kconfig" source "fs/vboxsf/Kconfig"

endif # MISC_FILESYSTEMS

menuconfig NETWORK_FILESYSTEMS bool "Network File Systems" default y depends on NET help Say Y here to get to see options for network filesystems and filesystem-related networking code, such as NFS daemon and RPCSEC security modules.

  This option alone does not add any kernel code.

  If you say N, all options in this submenu will be skipped and
  disabled; if unsure, say Y here.

if NETWORK_FILESYSTEMS

source "fs/nfs/Kconfig" source "fs/nfsd/Kconfig"

config GRACE_PERIOD tristate

config LOCKD tristate depends on FILE_LOCKING select CRC32 select GRACE_PERIOD

config LOCKD_V4 bool depends on NFSD || NFS_V3 depends on FILE_LOCKING default y

config NFS_ACL_SUPPORT tristate select FS_POSIX_ACL

config NFS_COMMON bool depends on NFSD || NFS_FS || LOCKD default y

config NFS_V4_2_SSC_HELPER bool default y if NFS_V4_2

source "net/sunrpc/Kconfig" source "fs/ceph/Kconfig"

source "fs/smb/Kconfig" source "fs/coda/Kconfig" source "fs/afs/Kconfig" source "fs/9p/Kconfig"

endif # NETWORK_FILESYSTEMS

source "fs/nls/Kconfig" source "fs/dlm/Kconfig" source "fs/unicode/Kconfig"

config IO_WQ bool

endmenu