Blame - fs/ext4/Kconfig - kernel/msm-4.9

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Alexey Dobriyan	6da0b38	2008-10-20 22:28:45 +0400	[diff] [blame]	1	config EXT4_FS
				2	tristate "The Extended 4 (ext4) filesystem"
				3	select JBD2
				4	select CRC16
Darrick J. Wong	0441984	2012-04-29 18:27:10 -0400	[diff] [blame]	5	select CRYPTO
				6	select CRYPTO_CRC32C
Alexey Dobriyan	6da0b38	2008-10-20 22:28:45 +0400	[diff] [blame]	7	help
				8	This is the next generation of the ext3 filesystem.
				9
				10	Unlike the change from ext2 filesystem to ext3 filesystem,
				11	the on-disk format of ext4 is not forwards compatible with
				12	ext3; it is based on extent maps and it supports 48-bit
				13	physical block numbers. The ext4 filesystem also supports delayed
				14	allocation, persistent preallocation, high resolution time stamps,
				15	and a number of other features to improve performance and speed
				16	up fsck time. For more information, please see the web pages at
				17	http://ext4.wiki.kernel.org.
				18
				19	The ext4 filesystem will support mounting an ext3
				20	filesystem; while there will be some performance gains from
				21	the delayed allocation and inode table readahead, the best
				22	performance gains will require enabling ext4 features in the
Matt LaPlante	692105b	2009-01-26 11:12:25 +0100	[diff] [blame]	23	filesystem, or formatting a new filesystem as an ext4
Alexey Dobriyan	6da0b38	2008-10-20 22:28:45 +0400	[diff] [blame]	24	filesystem initially.
				25
				26	To compile this file system support as a module, choose M here. The
				27	module will be called ext4.
				28
				29	If unsure, say N.
				30
Theodore Ts'o	24b5842	2009-12-07 14:08:51 -0500	[diff] [blame]	31	config EXT4_USE_FOR_EXT23
				32	bool "Use ext4 for ext2/ext3 file systems"
David Howells	84c6647	2009-12-21 10:54:09 -0500	[diff] [blame]	33	depends on EXT4_FS
Theodore Ts'o	a214238	2009-12-09 21:09:58 -0500	[diff] [blame]	34	depends on EXT3_FS=n \|\| EXT2_FS=n
Theodore Ts'o	24b5842	2009-12-07 14:08:51 -0500	[diff] [blame]	35	default y
				36	help
				37	Allow the ext4 file system driver code to be used for ext2 or
				38	ext3 file system mounts. This allows users to reduce their
				39	compiled kernel size by using one file system driver for
				40	ext2, ext3, and ext4 file systems.
				41
Alexey Dobriyan	6da0b38	2008-10-20 22:28:45 +0400	[diff] [blame]	42	config EXT4_FS_POSIX_ACL
				43	bool "Ext4 POSIX Access Control Lists"
Valerie Aurora	96465ef	2013-01-06 23:38:44 -0500	[diff] [blame]	44	depends on EXT4_FS
Alexey Dobriyan	6da0b38	2008-10-20 22:28:45 +0400	[diff] [blame]	45	select FS_POSIX_ACL
				46	help
				47	POSIX Access Control Lists (ACLs) support permissions for users and
				48	groups beyond the owner/group/world scheme.
				49
				50	To learn more about Access Control Lists, visit the POSIX ACLs for
				51	Linux website <http://acl.bestbits.at/>.
				52
				53	If you don't know what Access Control Lists are, say N
				54
				55	config EXT4_FS_SECURITY
				56	bool "Ext4 Security Labels"
Valerie Aurora	96465ef	2013-01-06 23:38:44 -0500	[diff] [blame]	57	depends on EXT4_FS
Alexey Dobriyan	6da0b38	2008-10-20 22:28:45 +0400	[diff] [blame]	58	help
				59	Security labels support alternative access control models
				60	implemented by security modules like SELinux. This option
				61	enables an extended attribute handler for file security
				62	labels in the ext4 filesystem.
				63
				64	If you are not using a security module that requires using
				65	extended attributes for file security labels, say N.
Theodore Ts'o	6ba495e	2009-09-18 13:38:55 -0400	[diff] [blame]	66
Theodore Ts'o	b17655f	2015-04-11 07:46:47 -0400	[diff] [blame^]	67	config EXT4_FS_ENCRYPTION
				68	bool "Ext4 Encryption"
				69	depends on EXT4_FS
				70	select CRYPTO_AES
				71	select CRYPTO_CBC
				72	select CRYPTO_ECB
				73	select CRYPTO_XTS
				74	select CRYPTO_CTS
				75	select CRYPTO_SHA256
				76	select KEYS
				77	select ENCRYPTED_KEYS
				78	help
				79	Enable encryption of ext4 files and directories. This
				80	feature is similar to ecryptfs, but it is more memory
				81	efficient since it avoids caching the encrypted and
				82	decrypted pages in the page cache.
				83
Theodore Ts'o	6ba495e	2009-09-18 13:38:55 -0400	[diff] [blame]	84	config EXT4_DEBUG
				85	bool "EXT4 debugging support"
				86	depends on EXT4_FS
				87	help
				88	Enables run-time debugging support for the ext4 filesystem.
				89
				90	If you select Y here, then you will be able to turn on debugging
Theodore Ts'o	7f3e3c7	2013-04-21 20:32:03 -0400	[diff] [blame]	91	with a command such as:
				92	echo 1 > /sys/module/ext4/parameters/mballoc_debug