[linux-2.6-block.git] / fs / ext4 / Kconfig

config EXT4_FS
	tristate "The Extended 4 (ext4) filesystem"
	select JBD2
	select CRC16
	select CRYPTO
	select CRYPTO_CRC32C
	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 will support mounting an ext3
	  filesystem; while there will be some performance gains from
	  the delayed allocation and inode table readahead, the best
	  performance gains will require enabling ext4 features in the
	  filesystem, or formatting a new filesystem as an ext4
	  filesystem initially.

	  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_EXT23
	bool "Use ext4 for ext2/ext3 file systems"
	depends on EXT4_FS
	depends on EXT3_FS=n || EXT2_FS=n
	default y
	help
	  Allow the ext4 file system driver code to be used for ext2 or
	  ext3 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.

	  To learn more about Access Control Lists, visit the POSIX ACLs for
	  Linux website <http://acl.bestbits.at/>.

	  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_ENCRYPTION
	tristate "Ext4 Encryption"
	depends on EXT4_FS
	select CRYPTO_AES
	select CRYPTO_CBC
	select CRYPTO_ECB
	select CRYPTO_XTS
	select CRYPTO_CTS
	select CRYPTO_SHA256
	select KEYS
	select ENCRYPTED_KEYS
	help
	  Enable encryption of ext4 files and directories.  This
	  feature is similar to ecryptfs, but it is more memory
	  efficient since it avoids caching the encrypted and
	  decrypted pages in the page cache.

config EXT4_FS_ENCRYPTION
	bool
	default y
	depends on EXT4_ENCRYPTION

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
	  with a command such as:
		echo 1 > /sys/module/ext4/parameters/mballoc_debug
Commit	Line	Data
6da0b38f AD	1	config EXT4_FS
	2	tristate "The Extended 4 (ext4) filesystem"
	3	select JBD2
	4	select CRC16
0441984a DW	5	select CRYPTO
0441984a DW	6	select CRYPTO_CRC32C
6da0b38f AD	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
692105b8	23	filesystem, or formatting a new filesystem as an ext4
6da0b38f AD	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
24b58424 TT	31	config EXT4_USE_FOR_EXT23
24b58424 TT	32	bool "Use ext4 for ext2/ext3 file systems"
84c66473	33	depends on EXT4_FS
a214238d	34	depends on EXT3_FS=n \|\| EXT2_FS=n
24b58424 TT	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
6da0b38f AD	42	config EXT4_FS_POSIX_ACL
6da0b38f AD	43	bool "Ext4 POSIX Access Control Lists"
96465efe	44	depends on EXT4_FS
6da0b38f AD	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"
96465efe	57	depends on EXT4_FS
6da0b38f AD	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.
6ba495e9	66
fb63e548 HX	67	config EXT4_ENCRYPTION
fb63e548 HX	68	tristate "Ext4 Encryption"
b17655fb TT	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
fb63e548 HX	84	config EXT4_FS_ENCRYPTION
	85	bool
	86	default y
	87	depends on EXT4_ENCRYPTION
	88
6ba495e9 TT	89	config EXT4_DEBUG
	90	bool "EXT4 debugging support"
	91	depends on EXT4_FS
	92	help
	93	Enables run-time debugging support for the ext4 filesystem.
	94
	95	If you select Y here, then you will be able to turn on debugging
7f3e3c7c TT	96	with a command such as:
7f3e3c7c TT	97	echo 1 > /sys/module/ext4/parameters/mballoc_debug