1# SPDX-License-Identifier: GPL-2.0-only 2# Ext3 configs are here for backward compatibility with old configs which may 3# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable 4# kernels after the removal of ext3 driver. 5config EXT3_FS 6 tristate "The Extended 3 (ext3) filesystem" 7 # These must match EXT4_FS selects... 8 select EXT4_FS 9 select JBD2 10 select CRC16 11 select CRYPTO 12 select CRYPTO_CRC32C 13 help 14 This config option is here only for backward compatibility. ext3 15 filesystem is now handled by the ext4 driver. 16 17config EXT3_FS_POSIX_ACL 18 bool "Ext3 POSIX Access Control Lists" 19 depends on EXT3_FS 20 select EXT4_FS_POSIX_ACL 21 select FS_POSIX_ACL 22 help 23 This config option is here only for backward compatibility. ext3 24 filesystem is now handled by the ext4 driver. 25 26config EXT3_FS_SECURITY 27 bool "Ext3 Security Labels" 28 depends on EXT3_FS 29 select EXT4_FS_SECURITY 30 help 31 This config option is here only for backward compatibility. ext3 32 filesystem is now handled by the ext4 driver. 33 34config EXT4_FS 35 tristate "The Extended 4 (ext4) filesystem" 36 # Please update EXT3_FS selects when changing these 37 select JBD2 38 select CRC16 39 select CRYPTO 40 select CRYPTO_CRC32C 41 select FS_IOMAP 42 help 43 This is the next generation of the ext3 filesystem. 44 45 Unlike the change from ext2 filesystem to ext3 filesystem, 46 the on-disk format of ext4 is not forwards compatible with 47 ext3; it is based on extent maps and it supports 48-bit 48 physical block numbers. The ext4 filesystem also supports delayed 49 allocation, persistent preallocation, high resolution time stamps, 50 and a number of other features to improve performance and speed 51 up fsck time. For more information, please see the web pages at 52 http://ext4.wiki.kernel.org. 53 54 The ext4 filesystem supports mounting an ext3 filesystem; while there 55 are some performance gains from the delayed allocation and inode 56 table readahead, the best performance gains require enabling ext4 57 features in the filesystem using tune2fs, or formatting a new 58 filesystem as an ext4 filesystem initially. Without explicit enabling 59 of ext4 features, the on disk filesystem format stays fully backward 60 compatible. 61 62 To compile this file system support as a module, choose M here. The 63 module will be called ext4. 64 65 If unsure, say N. 66 67config EXT4_USE_FOR_EXT2 68 bool "Use ext4 for ext2 file systems" 69 depends on EXT4_FS 70 depends on EXT2_FS=n 71 default y 72 help 73 Allow the ext4 file system driver code to be used for ext2 74 file system mounts. This allows users to reduce their 75 compiled kernel size by using one file system driver for 76 ext2, ext3, and ext4 file systems. 77 78config EXT4_FS_POSIX_ACL 79 bool "Ext4 POSIX Access Control Lists" 80 depends on EXT4_FS 81 select FS_POSIX_ACL 82 help 83 POSIX Access Control Lists (ACLs) support permissions for users and 84 groups beyond the owner/group/world scheme. 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_DEBUG 101 bool "Ext4 debugging support" 102 depends on EXT4_FS 103 help 104 Enables run-time debugging support for the ext4 filesystem. 105 106 If you select Y here, then you will be able to turn on debugging 107 with a command such as: 108 echo 1 > /sys/module/ext4/parameters/mballoc_debug 109