[people/ms/linux.git] / fs / ext4 / Kconfig

# SPDX-License-Identifier: GPL-2.0-only
# Ext3 configs are here for backward compatibility with old configs which may
# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
# kernels after the removal of ext3 driver.
config EXT3_FS
	tristate "The Extended 3 (ext3) filesystem"
	select EXT4_FS
	help
	  This config option is here only for backward compatibility. ext3
	  filesystem is now handled by the ext4 driver.

config EXT3_FS_POSIX_ACL
	bool "Ext3 POSIX Access Control Lists"
	depends on EXT3_FS
	select EXT4_FS_POSIX_ACL
	select FS_POSIX_ACL
	help
	  This config option is here only for backward compatibility. ext3
	  filesystem is now handled by the ext4 driver.

config EXT3_FS_SECURITY
	bool "Ext3 Security Labels"
	depends on EXT3_FS
	select EXT4_FS_SECURITY
	help
	  This config option is here only for backward compatibility. ext3
	  filesystem is now handled by the ext4 driver.

config EXT4_FS
	tristate "The Extended 4 (ext4) filesystem"
	select JBD2
	select CRC16
	select CRYPTO
	select CRYPTO_CRC32C
	select FS_IOMAP
	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
	help
	  This is the next generation of the ext3 filesystem.

	  Unlike the change from ext2 filesystem to ext3 filesystem,
	  the on-disk format of ext4 is not forwards compatible with
	  ext3; it is based on extent maps and it supports 48-bit
	  physical block numbers.  The ext4 filesystem also supports delayed
	  allocation, persistent preallocation, high resolution time stamps,
	  and a number of other features to improve performance and speed
	  up fsck time.  For more information, please see the web pages at
	  http://ext4.wiki.kernel.org.

	  The ext4 filesystem supports mounting an ext3 filesystem; while there
	  are some performance gains from the delayed allocation and inode
	  table readahead, the best performance gains require enabling ext4
	  features in the filesystem using tune2fs, or formatting a new
	  filesystem as an ext4 filesystem initially. Without explicit enabling
	  of ext4 features, the on disk filesystem format stays fully backward
	  compatible.

	  To compile this file system support as a module, choose M here. The
	  module will be called ext4.

	  If unsure, say N.

config EXT4_USE_FOR_EXT2
	bool "Use ext4 for ext2 file systems"
	depends on EXT4_FS
	depends on EXT2_FS=n
	default y
	help
	  Allow the ext4 file system driver code to be used for ext2
	  file system mounts.  This allows users to reduce their
	  compiled kernel size by using one file system driver for
	  ext2, ext3, and ext4 file systems.

config EXT4_FS_POSIX_ACL
	bool "Ext4 POSIX Access Control Lists"
	depends on EXT4_FS
	select FS_POSIX_ACL
	help
	  POSIX Access Control Lists (ACLs) support permissions for users and
	  groups beyond the owner/group/world scheme.

	  If you don't know what Access Control Lists are, say N

config EXT4_FS_SECURITY
	bool "Ext4 Security Labels"
	depends on EXT4_FS
	help
	  Security labels support alternative access control models
	  implemented by security modules like SELinux.  This option
	  enables an extended attribute handler for file security
	  labels in the ext4 filesystem.

	  If you are not using a security module that requires using
	  extended attributes for file security labels, say N.

config EXT4_DEBUG
	bool "Ext4 debugging support"
	depends on EXT4_FS
	help
	  Enables run-time debugging support for the ext4 filesystem.

	  If you select Y here, then you will be able to turn on debugging
	  using dynamic debug control for mb_debug() / ext_debug() msgs.

config EXT4_KUNIT_TESTS
	tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS
	depends on EXT4_FS && KUNIT
	default KUNIT_ALL_TESTS
	help
	  This builds the ext4 KUnit tests.

	  KUnit tests run during boot and output the results to the debug log
	  in TAP format (https://testanything.org/). Only useful for kernel devs
	  running KUnit test harness and are not for inclusion into a production
	  build.

	  For more information on KUnit and unit tests in general please refer
	  to the KUnit documentation in Documentation/dev-tools/kunit/.

	  If unsure, say N.
Commit	Line	Data
ec8f24b7	1	# SPDX-License-Identifier: GPL-2.0-only
c290ea01 JK	2	# Ext3 configs are here for backward compatibility with old configs which may
	3	# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
	4	# kernels after the removal of ext3 driver.
	5	config EXT3_FS
	6	tristate "The Extended 3 (ext3) filesystem"
c290ea01	7	select EXT4_FS
c290ea01 JK	8	help
	9	This config option is here only for backward compatibility. ext3
	10	filesystem is now handled by the ext4 driver.
	11
	12	config EXT3_FS_POSIX_ACL
	13	bool "Ext3 POSIX Access Control Lists"
	14	depends on EXT3_FS
	15	select EXT4_FS_POSIX_ACL
	16	select FS_POSIX_ACL
	17	help
	18	This config option is here only for backward compatibility. ext3
	19	filesystem is now handled by the ext4 driver.
	20
	21	config EXT3_FS_SECURITY
	22	bool "Ext3 Security Labels"
	23	depends on EXT3_FS
	24	select EXT4_FS_SECURITY
	25	help
	26	This config option is here only for backward compatibility. ext3
	27	filesystem is now handled by the ext4 driver.
	28
6da0b38f AD	29	config EXT4_FS
	30	tristate "The Extended 4 (ext4) filesystem"
	31	select JBD2
	32	select CRC16
0441984a DW	33	select CRYPTO
0441984a DW	34	select CRYPTO_CRC32C
545052e9	35	select FS_IOMAP
ede7a09f	36	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
6da0b38f AD	37	help
	38	This is the next generation of the ext3 filesystem.
	39
	40	Unlike the change from ext2 filesystem to ext3 filesystem,
	41	the on-disk format of ext4 is not forwards compatible with
	42	ext3; it is based on extent maps and it supports 48-bit
	43	physical block numbers. The ext4 filesystem also supports delayed
	44	allocation, persistent preallocation, high resolution time stamps,
	45	and a number of other features to improve performance and speed
	46	up fsck time. For more information, please see the web pages at
	47	http://ext4.wiki.kernel.org.
	48
c8962f4b JK	49	The ext4 filesystem supports mounting an ext3 filesystem; while there
	50	are some performance gains from the delayed allocation and inode
	51	table readahead, the best performance gains require enabling ext4
	52	features in the filesystem using tune2fs, or formatting a new
	53	filesystem as an ext4 filesystem initially. Without explicit enabling
	54	of ext4 features, the on disk filesystem format stays fully backward
	55	compatible.
6da0b38f AD	56
	57	To compile this file system support as a module, choose M here. The
	58	module will be called ext4.
	59
	60	If unsure, say N.
	61
c290ea01	62	config EXT4_USE_FOR_EXT2
d4eb6dee	63	bool "Use ext4 for ext2 file systems"
84c66473	64	depends on EXT4_FS
c290ea01	65	depends on EXT2_FS=n
24b58424 TT	66	default y
24b58424 TT	67	help
c290ea01 JK	68	Allow the ext4 file system driver code to be used for ext2
c290ea01 JK	69	file system mounts. This allows users to reduce their
24b58424 TT	70	compiled kernel size by using one file system driver for
	71	ext2, ext3, and ext4 file systems.
	72
6da0b38f AD	73	config EXT4_FS_POSIX_ACL
6da0b38f AD	74	bool "Ext4 POSIX Access Control Lists"
96465efe	75	depends on EXT4_FS
6da0b38f AD	76	select FS_POSIX_ACL
	77	help
	78	POSIX Access Control Lists (ACLs) support permissions for users and
	79	groups beyond the owner/group/world scheme.
	80
6da0b38f AD	81	If you don't know what Access Control Lists are, say N
	82
	83	config EXT4_FS_SECURITY
	84	bool "Ext4 Security Labels"
96465efe	85	depends on EXT4_FS
6da0b38f AD	86	help
	87	Security labels support alternative access control models
	88	implemented by security modules like SELinux. This option
	89	enables an extended attribute handler for file security
	90	labels in the ext4 filesystem.
	91
	92	If you are not using a security module that requires using
	93	extended attributes for file security labels, say N.
6ba495e9 TT	94
6ba495e9 TT	95	config EXT4_DEBUG
231fe82b	96	bool "Ext4 debugging support"
6ba495e9 TT	97	depends on EXT4_FS
	98	help
	99	Enables run-time debugging support for the ext4 filesystem.
	100
	101	If you select Y here, then you will be able to turn on debugging
70aa1554	102	using dynamic debug control for mb_debug() / ext_debug() msgs.
1cbeab1b IZ	103
1cbeab1b IZ	104	config EXT4_KUNIT_TESTS
d194e12b	105	tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS
302fdade	106	depends on EXT4_FS && KUNIT
d194e12b	107	default KUNIT_ALL_TESTS
1cbeab1b IZ	108	help
	109	This builds the ext4 KUnit tests.
	110
	111	KUnit tests run during boot and output the results to the debug log
e65bf6e4	112	in TAP format (https://testanything.org/). Only useful for kernel devs
1cbeab1b IZ	113	running KUnit test harness and are not for inclusion into a production
	114	build.
	115
	116	For more information on KUnit and unit tests in general please refer
	117	to the KUnit documentation in Documentation/dev-tools/kunit/.
	118
	119	If unsure, say N.