1config 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 31config EXT3_DEFAULTS_TO_ORDERED 32 bool "Default to 'data=ordered' in ext3" 33 depends on EXT3_FS 34 help 35 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: 43 44 http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs 45 46 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'. 51 52config 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. 89