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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 | |
21 | filesystem, or formating 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 | ||
29 | config 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 | ||
43 | config 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 | ||
56 | config 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 | ||
69 | config 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. |