1# Ext3 configs are here for backward compatibility with old configs which may 2# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable 3# kernels after the removal of ext3 driver. 4config EXT3_FS 5 tristate "The Extended 3 (ext3) filesystem" 6 # These must match EXT4_FS selects... 7 select EXT4_FS 8 select JBD2 9 select CRC16 10 select CRYPTO 11 select CRYPTO_CRC32C 12 help 13 This config option is here only for backward compatibility. ext3 14 filesystem is now handled by the ext4 driver. 15 16config EXT3_FS_POSIX_ACL 17 bool "Ext3 POSIX Access Control Lists" 18 depends on EXT3_FS 19 select EXT4_FS_POSIX_ACL 20 select FS_POSIX_ACL 21 help 22 This config option is here only for backward compatibility. ext3 23 filesystem is now handled by the ext4 driver. 24 25config EXT3_FS_SECURITY 26 bool "Ext3 Security Labels" 27 depends on EXT3_FS 28 select EXT4_FS_SECURITY 29 help 30 This config option is here only for backward compatibility. ext3 31 filesystem is now handled by the ext4 driver. 32 33config EXT4_FS 34 tristate "The Extended 4 (ext4) filesystem" 35 # Please update EXT3_FS selects when changing these 36 select JBD2 37 select CRC16 38 select CRYPTO 39 select CRYPTO_CRC32C 40 help 41 This is the next generation of the ext3 filesystem. 42 43 Unlike the change from ext2 filesystem to ext3 filesystem, 44 the on-disk format of ext4 is not forwards compatible with 45 ext3; it is based on extent maps and it supports 48-bit 46 physical block numbers. The ext4 filesystem also supports delayed 47 allocation, persistent preallocation, high resolution time stamps, 48 and a number of other features to improve performance and speed 49 up fsck time. For more information, please see the web pages at 50 http://ext4.wiki.kernel.org. 51 52 The ext4 filesystem will support mounting an ext3 53 filesystem; while there will be some performance gains from 54 the delayed allocation and inode table readahead, the best 55 performance gains will require enabling ext4 features in the 56 filesystem, or formatting a new filesystem as an ext4 57 filesystem initially. 58 59 To compile this file system support as a module, choose M here. The 60 module will be called ext4. 61 62 If unsure, say N. 63 64config EXT4_USE_FOR_EXT2 65 bool "Use ext4 for ext2/ext3 file systems" 66 depends on EXT4_FS 67 depends on EXT2_FS=n 68 default y 69 help 70 Allow the ext4 file system driver code to be used for ext2 71 file system mounts. This allows users to reduce their 72 compiled kernel size by using one file system driver for 73 ext2, ext3, and ext4 file systems. 74 75config EXT4_FS_POSIX_ACL 76 bool "Ext4 POSIX Access Control Lists" 77 depends on EXT4_FS 78 select FS_POSIX_ACL 79 help 80 POSIX Access Control Lists (ACLs) support permissions for users and 81 groups beyond the owner/group/world scheme. 82 83 To learn more about Access Control Lists, visit the POSIX ACLs for 84 Linux website <http://acl.bestbits.at/>. 85 86 If you don't know what Access Control Lists are, say N 87 88config EXT4_FS_SECURITY 89 bool "Ext4 Security Labels" 90 depends on EXT4_FS 91 help 92 Security labels support alternative access control models 93 implemented by security modules like SELinux. This option 94 enables an extended attribute handler for file security 95 labels in the ext4 filesystem. 96 97 If you are not using a security module that requires using 98 extended attributes for file security labels, say N. 99 100config EXT4_ENCRYPTION 101 tristate "Ext4 Encryption" 102 depends on EXT4_FS 103 select CRYPTO_AES 104 select CRYPTO_CBC 105 select CRYPTO_ECB 106 select CRYPTO_XTS 107 select CRYPTO_CTS 108 select CRYPTO_CTR 109 select CRYPTO_SHA256 110 select KEYS 111 select ENCRYPTED_KEYS 112 help 113 Enable encryption of ext4 files and directories. This 114 feature is similar to ecryptfs, but it is more memory 115 efficient since it avoids caching the encrypted and 116 decrypted pages in the page cache. 117 118config EXT4_FS_ENCRYPTION 119 bool 120 default y 121 depends on EXT4_ENCRYPTION 122 123config EXT4_DEBUG 124 bool "EXT4 debugging support" 125 depends on EXT4_FS 126 help 127 Enables run-time debugging support for the ext4 filesystem. 128 129 If you select Y here, then you will be able to turn on debugging 130 with a command such as: 131 echo 1 > /sys/module/ext4/parameters/mballoc_debug 132