| Alexey Dobriyan | 6da0b38 | 2008-10-20 22:28:45 +0400 | [diff] [blame] | 1 | config 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 Torvalds | bbae8bc | 2009-04-06 17:16:47 -0700 | [diff] [blame] | 31 | config EXT3_DEFAULTS_TO_ORDERED |
| 32 | bool "Default to 'data=ordered' in ext3 (legacy option)" |
| 33 | depends on EXT3_FS |
| 34 | help |
| 35 | If a filesystem does not explicitly specify a data ordering |
| 36 | mode, and the journal capability allowed it, ext3 used to |
| 37 | historically default to 'data=ordered'. |
| 38 | |
| 39 | That was a rather unfortunate choice, because it leads to all |
| 40 | kinds of latency problems, and the 'data=writeback' mode is more |
| 41 | appropriate these days. |
| 42 | |
| 43 | You should probably always answer 'n' here, and if you really |
| 44 | want to use 'data=ordered' mode, set it in the filesystem itself |
| 45 | with 'tune2fs -o journal_data_ordered'. |
| 46 | |
| 47 | But if you really want to enable the legacy default, you can do |
| 48 | so by answering 'y' to this question. |
| 49 | |
| Alexey Dobriyan | 6da0b38 | 2008-10-20 22:28:45 +0400 | [diff] [blame] | 50 | config EXT3_FS_XATTR |
| 51 | bool "Ext3 extended attributes" |
| 52 | depends on EXT3_FS |
| 53 | default y |
| 54 | help |
| 55 | Extended attributes are name:value pairs associated with inodes by |
| 56 | the kernel or by users (see the attr(5) manual page, or visit |
| 57 | <http://acl.bestbits.at/> for details). |
| 58 | |
| 59 | If unsure, say N. |
| 60 | |
| 61 | You need this for POSIX ACL support on ext3. |
| 62 | |
| 63 | config EXT3_FS_POSIX_ACL |
| 64 | bool "Ext3 POSIX Access Control Lists" |
| 65 | depends on EXT3_FS_XATTR |
| 66 | select FS_POSIX_ACL |
| 67 | help |
| 68 | Posix Access Control Lists (ACLs) support permissions for users and |
| 69 | groups beyond the owner/group/world scheme. |
| 70 | |
| 71 | To learn more about Access Control Lists, visit the Posix ACLs for |
| 72 | Linux website <http://acl.bestbits.at/>. |
| 73 | |
| 74 | If you don't know what Access Control Lists are, say N |
| 75 | |
| 76 | config EXT3_FS_SECURITY |
| 77 | bool "Ext3 Security Labels" |
| 78 | depends on EXT3_FS_XATTR |
| 79 | help |
| 80 | Security labels support alternative access control models |
| 81 | implemented by security modules like SELinux. This option |
| 82 | enables an extended attribute handler for file security |
| 83 | labels in the ext3 filesystem. |
| 84 | |
| 85 | If you are not using a security module that requires using |
| 86 | extended attributes for file security labels, say N. |