2 tristate "The Extended 4 (ext4) filesystem"
6 This is the next generation of the ext3 filesystem.
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.
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
21 filesystem, or formatting a new filesystem as an ext4
24 To compile this file system support as a module, choose M here. The
25 module will be called ext4.
29 config EXT4_USE_FOR_EXT23
30 bool "Use ext4 for ext2/ext3 file systems"
32 depends on EXT3_FS=n || EXT2_FS=n
35 Allow the ext4 file system driver code to be used for ext2 or
36 ext3 file system mounts. This allows users to reduce their
37 compiled kernel size by using one file system driver for
38 ext2, ext3, and ext4 file systems.
41 bool "Ext4 extended attributes"
45 Extended attributes are name:value pairs associated with inodes by
46 the kernel or by users (see the attr(5) manual page, or visit
47 <http://acl.bestbits.at/> for details).
51 You need this for POSIX ACL support on ext4.
53 config EXT4_FS_POSIX_ACL
54 bool "Ext4 POSIX Access Control Lists"
55 depends on EXT4_FS_XATTR
58 POSIX Access Control Lists (ACLs) support permissions for users and
59 groups beyond the owner/group/world scheme.
61 To learn more about Access Control Lists, visit the POSIX ACLs for
62 Linux website <http://acl.bestbits.at/>.
64 If you don't know what Access Control Lists are, say N
66 config EXT4_FS_SECURITY
67 bool "Ext4 Security Labels"
68 depends on EXT4_FS_XATTR
70 Security labels support alternative access control models
71 implemented by security modules like SELinux. This option
72 enables an extended attribute handler for file security
73 labels in the ext4 filesystem.
75 If you are not using a security module that requires using
76 extended attributes for file security labels, say N.
79 bool "EXT4 debugging support"
82 Enables run-time debugging support for the ext4 filesystem.
84 If you select Y here, then you will be able to turn on debugging
85 with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"