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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 | ||
6da0b38f AD |
29 | config EXT4_FS_XATTR |
30 | bool "Ext4 extended attributes" | |
31 | depends on EXT4_FS | |
32 | default y | |
33 | help | |
34 | Extended attributes are name:value pairs associated with inodes by | |
35 | the kernel or by users (see the attr(5) manual page, or visit | |
36 | <http://acl.bestbits.at/> for details). | |
37 | ||
38 | If unsure, say N. | |
39 | ||
40 | You need this for POSIX ACL support on ext4. | |
41 | ||
42 | config EXT4_FS_POSIX_ACL | |
43 | bool "Ext4 POSIX Access Control Lists" | |
44 | depends on EXT4_FS_XATTR | |
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" | |
57 | depends on EXT4_FS_XATTR | |
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 TT |
66 | |
67 | config EXT4_DEBUG | |
68 | bool "EXT4 debugging support" | |
69 | depends on EXT4_FS | |
70 | help | |
71 | Enables run-time debugging support for the ext4 filesystem. | |
72 | ||
73 | If you select Y here, then you will be able to turn on debugging | |
74 | with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug" |