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

config EXT4_FS
	tristate "The Extended 4 (ext4) filesystem"
	select JBD2
	select CRC16
	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 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_XATTR
	bool "Ext4 extended attributes"
	depends on EXT4_FS
	default y
	help
	  Extended attributes are name:value pairs associated with inodes by
	  the kernel or by users (see the attr(5) manual page, or visit
	  <http://acl.bestbits.at/> for details).

	  If unsure, say N.

	  You need this for POSIX ACL support on ext4.

config EXT4_FS_POSIX_ACL
	bool "Ext4 POSIX Access Control Lists"
	depends on EXT4_FS_XATTR
	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_XATTR
	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
	  with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"
Commit	Line	Data
6da0b38f AD	1	config EXT4_FS
	2	tristate "The Extended 4 (ext4) filesystem"
	3	select JBD2
	4	select CRC16
	5	help
	6	This is the next generation of the ext3 filesystem.
	7
	8	Unlike the change from ext2 filesystem to ext3 filesystem,
	9	the on-disk format of ext4 is not forwards compatible with
	10	ext3; it is based on extent maps and it supports 48-bit
	11	physical block numbers. The ext4 filesystem also supports delayed
	12	allocation, persistent preallocation, high resolution time stamps,
	13	and a number of other features to improve performance and speed
	14	up fsck time. For more information, please see the web pages at
	15	http://ext4.wiki.kernel.org.
	16
	17	The ext4 filesystem will support mounting an ext3
	18	filesystem; while there will be some performance gains from
	19	the delayed allocation and inode table readahead, the best
	20	performance gains will require enabling ext4 features in the
692105b8	21	filesystem, or formatting a new filesystem as an ext4
6da0b38f AD	22	filesystem initially.
	23
	24	To compile this file system support as a module, choose M here. The
	25	module will be called ext4.
	26
	27	If unsure, say N.
	28
24b58424 TT	29	config EXT4_USE_FOR_EXT23
24b58424 TT	30	bool "Use ext4 for ext2/ext3 file systems"
a214238d	31	depends on EXT3_FS=n \|\| EXT2_FS=n
24b58424 TT	32	default y
	33	help
	34	Allow the ext4 file system driver code to be used for ext2 or
	35	ext3 file system mounts. This allows users to reduce their
	36	compiled kernel size by using one file system driver for
	37	ext2, ext3, and ext4 file systems.
	38
6da0b38f AD	39	config EXT4_FS_XATTR
	40	bool "Ext4 extended attributes"
	41	depends on EXT4_FS
	42	default y
	43	help
	44	Extended attributes are name:value pairs associated with inodes by
	45	the kernel or by users (see the attr(5) manual page, or visit
	46	<http://acl.bestbits.at/> for details).
	47
	48	If unsure, say N.
	49
	50	You need this for POSIX ACL support on ext4.
	51
	52	config EXT4_FS_POSIX_ACL
	53	bool "Ext4 POSIX Access Control Lists"
	54	depends on EXT4_FS_XATTR
	55	select FS_POSIX_ACL
	56	help
	57	POSIX Access Control Lists (ACLs) support permissions for users and
	58	groups beyond the owner/group/world scheme.
	59
	60	To learn more about Access Control Lists, visit the POSIX ACLs for
	61	Linux website <http://acl.bestbits.at/>.
	62
	63	If you don't know what Access Control Lists are, say N
	64
	65	config EXT4_FS_SECURITY
	66	bool "Ext4 Security Labels"
	67	depends on EXT4_FS_XATTR
	68	help
	69	Security labels support alternative access control models
	70	implemented by security modules like SELinux. This option
	71	enables an extended attribute handler for file security
	72	labels in the ext4 filesystem.
	73
	74	If you are not using a security module that requires using
	75	extended attributes for file security labels, say N.
6ba495e9 TT	76
	77	config EXT4_DEBUG
	78	bool "EXT4 debugging support"
	79	depends on EXT4_FS
	80	help
	81	Enables run-time debugging support for the ext4 filesystem.
	82
	83	If you select Y here, then you will be able to turn on debugging
	84	with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"