blob: 522b15498f459da163b2318348108569f1f34a92 [file] [log] [blame]
Alexey Dobriyan6da0b382008-10-20 22:28:45 +04001config EXT3_FS
2 tristate "Ext3 journalling file system support"
3 select JBD
4 help
5 This is the journalling version of the Second extended file system
6 (often called ext3), the de facto standard Linux file system
7 (method to organize files on a storage device) for hard disks.
8
9 The journalling code included in this driver means you do not have
10 to run e2fsck (file system checker) on your file systems after a
11 crash. The journal keeps track of any changes that were being made
12 at the time the system crashed, and can ensure that your file system
13 is consistent without the need for a lengthy check.
14
15 Other than adding the journal to the file system, the on-disk format
16 of ext3 is identical to ext2. It is possible to freely switch
17 between using the ext3 driver and the ext2 driver, as long as the
18 file system has been cleanly unmounted, or e2fsck is run on the file
19 system.
20
21 To add a journal on an existing ext2 file system or change the
22 behavior of ext3 file systems, you can use the tune2fs utility ("man
23 tune2fs"). To modify attributes of files and directories on ext3
24 file systems, use chattr ("man chattr"). You need to be using
25 e2fsprogs version 1.20 or later in order to create ext3 journals
26 (available at <http://sourceforge.net/projects/e2fsprogs/>).
27
28 To compile this file system support as a module, choose M here: the
29 module will be called ext3.
30
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070031config EXT3_DEFAULTS_TO_ORDERED
Theodore Ts'o6d418072009-08-10 16:03:43 -040032 bool "Default to 'data=ordered' in ext3"
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070033 depends on EXT3_FS
34 help
Theodore Ts'o6d418072009-08-10 16:03:43 -040035 The journal mode options for ext3 have different tradeoffs
36 between when data is guaranteed to be on disk and
37 performance. The use of "data=writeback" can cause
38 unwritten data to appear in files after an system crash or
39 power failure, which can be a security issue. However,
40 "data=ordered" mode can also result in major performance
41 problems, including seconds-long delays before an fsync()
42 call returns. For details, see:
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070043
Theodore Ts'o6d418072009-08-10 16:03:43 -040044 http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070045
Theodore Ts'o6d418072009-08-10 16:03:43 -040046 If you have been historically happy with ext3's performance,
47 data=ordered mode will be a safe choice and you should
48 answer 'y' here. If you understand the reliability and data
49 privacy issues of data=writeback and are willing to make
50 that trade off, answer 'n'.
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070051
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040052config EXT3_FS_XATTR
53 bool "Ext3 extended attributes"
54 depends on EXT3_FS
55 default y
56 help
57 Extended attributes are name:value pairs associated with inodes by
58 the kernel or by users (see the attr(5) manual page, or visit
59 <http://acl.bestbits.at/> for details).
60
61 If unsure, say N.
62
63 You need this for POSIX ACL support on ext3.
64
65config EXT3_FS_POSIX_ACL
66 bool "Ext3 POSIX Access Control Lists"
67 depends on EXT3_FS_XATTR
68 select FS_POSIX_ACL
69 help
70 Posix Access Control Lists (ACLs) support permissions for users and
71 groups beyond the owner/group/world scheme.
72
73 To learn more about Access Control Lists, visit the Posix ACLs for
74 Linux website <http://acl.bestbits.at/>.
75
76 If you don't know what Access Control Lists are, say N
77
78config EXT3_FS_SECURITY
79 bool "Ext3 Security Labels"
80 depends on EXT3_FS_XATTR
81 help
82 Security labels support alternative access control models
83 implemented by security modules like SELinux. This option
84 enables an extended attribute handler for file security
85 labels in the ext3 filesystem.
86
87 If you are not using a security module that requires using
88 extended attributes for file security labels, say N.