Root/fs/ext4/Kconfig

1config 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
21      filesystem, or formatting a new filesystem as an ext4
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
29config EXT4DEV_COMPAT
30    bool "Enable ext4dev compatibility"
31    depends on EXT4_FS
32    help
33      Starting with 2.6.28, the name of the ext4 filesystem was
34      renamed from ext4dev to ext4. Unfortunately there are some
35      legacy userspace programs (such as klibc's fstype) have
36      "ext4dev" hardcoded.
37
38      To enable backwards compatibility so that systems that are
39      still expecting to mount ext4 filesystems using ext4dev,
40      chose Y here. This feature will go away by 2.6.31, so
41      please arrange to get your userspace programs fixed!
42
43config EXT4_FS_XATTR
44    bool "Ext4 extended attributes"
45    depends on EXT4_FS
46    default y
47    help
48      Extended attributes are name:value pairs associated with inodes by
49      the kernel or by users (see the attr(5) manual page, or visit
50      <http://acl.bestbits.at/> for details).
51
52      If unsure, say N.
53
54      You need this for POSIX ACL support on ext4.
55
56config EXT4_FS_POSIX_ACL
57    bool "Ext4 POSIX Access Control Lists"
58    depends on EXT4_FS_XATTR
59    select FS_POSIX_ACL
60    help
61      POSIX Access Control Lists (ACLs) support permissions for users and
62      groups beyond the owner/group/world scheme.
63
64      To learn more about Access Control Lists, visit the POSIX ACLs for
65      Linux website <http://acl.bestbits.at/>.
66
67      If you don't know what Access Control Lists are, say N
68
69config EXT4_FS_SECURITY
70    bool "Ext4 Security Labels"
71    depends on EXT4_FS_XATTR
72    help
73      Security labels support alternative access control models
74      implemented by security modules like SELinux. This option
75      enables an extended attribute handler for file security
76      labels in the ext4 filesystem.
77
78      If you are not using a security module that requires using
79      extended attributes for file security labels, say N.
80

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