1config EXT4_FS
 2	tristate "The Extended 4 (ext4) filesystem"
 3	select JBD2
 4	select CRC16
 5	select CRYPTO
 6	select CRYPTO_CRC32C
 
 
 7	help
 8	  This is the next generation of the ext3 filesystem.
 9
10	  Unlike the change from ext2 filesystem to ext3 filesystem,
11	  the on-disk format of ext4 is not forwards compatible with
12	  ext3; it is based on extent maps and it supports 48-bit
13	  physical block numbers.  The ext4 filesystem also supports delayed
14	  allocation, persistent preallocation, high resolution time stamps,
15	  and a number of other features to improve performance and speed
16	  up fsck time.  For more information, please see the web pages at
17	  http://ext4.wiki.kernel.org.
18
19	  The ext4 filesystem will support mounting an ext3
20	  filesystem; while there will be some performance gains from
21	  the delayed allocation and inode table readahead, the best
22	  performance gains will require enabling ext4 features in the
23	  filesystem, or formatting a new filesystem as an ext4
24	  filesystem initially.
 
25
26	  To compile this file system support as a module, choose M here. The
27	  module will be called ext4.
28
29	  If unsure, say N.
30
31config EXT4_USE_FOR_EXT23
32	bool "Use ext4 for ext2/ext3 file systems"
33	depends on EXT4_FS
34	depends on EXT3_FS=n || EXT2_FS=n
35	default y
36	help
37	  Allow the ext4 file system driver code to be used for ext2 or
38	  ext3 file system mounts.  This allows users to reduce their
39	  compiled kernel size by using one file system driver for
40	  ext2, ext3, and ext4 file systems.
41
42config EXT4_FS_XATTR
43	bool "Ext4 extended attributes"
44	depends on EXT4_FS
45	default y
46	help
47	  Extended attributes are name:value pairs associated with inodes by
48	  the kernel or by users (see the attr(5) manual page, or visit
49	  <http://acl.bestbits.at/> for details).
50
51	  If unsure, say N.
52
53	  You need this for POSIX ACL support on ext4.
54
55config EXT4_FS_POSIX_ACL
56	bool "Ext4 POSIX Access Control Lists"
57	depends on EXT4_FS_XATTR
58	select FS_POSIX_ACL
59	help
60	  POSIX Access Control Lists (ACLs) support permissions for users and
61	  groups beyond the owner/group/world scheme.
62
63	  To learn more about Access Control Lists, visit the POSIX ACLs for
64	  Linux website <http://acl.bestbits.at/>.
65
66	  If you don't know what Access Control Lists are, say N
67
68config EXT4_FS_SECURITY
69	bool "Ext4 Security Labels"
70	depends on EXT4_FS_XATTR
71	help
72	  Security labels support alternative access control models
73	  implemented by security modules like SELinux.  This option
74	  enables an extended attribute handler for file security
75	  labels in the ext4 filesystem.
76
77	  If you are not using a security module that requires using
78	  extended attributes for file security labels, say N.
79
80config EXT4_DEBUG
81	bool "EXT4 debugging support"
82	depends on EXT4_FS
83	help
84	  Enables run-time debugging support for the ext4 filesystem.
85
86	  If you select Y here, then you will be able to turn on debugging
87	  with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

  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	select EXT4_FS
  8	help
  9	  This config option is here only for backward compatibility. ext3
 10	  filesystem is now handled by the ext4 driver.
 11
 12config EXT3_FS_POSIX_ACL
 13	bool "Ext3 POSIX Access Control Lists"
 14	depends on EXT3_FS
 15	select EXT4_FS_POSIX_ACL
 16	select FS_POSIX_ACL
 17	help
 18	  This config option is here only for backward compatibility. ext3
 19	  filesystem is now handled by the ext4 driver.
 20
 21config EXT3_FS_SECURITY
 22	bool "Ext3 Security Labels"
 23	depends on EXT3_FS
 24	select EXT4_FS_SECURITY
 25	help
 26	  This config option is here only for backward compatibility. ext3
 27	  filesystem is now handled by the ext4 driver.
 28
 29config EXT4_FS
 30	tristate "The Extended 4 (ext4) filesystem"
 31	select JBD2
 32	select CRC16
 33	select CRYPTO
 34	select CRYPTO_CRC32C
 35	select FS_IOMAP
 36	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
 37	help
 38	  This is the next generation of the ext3 filesystem.
 39
 40	  Unlike the change from ext2 filesystem to ext3 filesystem,
 41	  the on-disk format of ext4 is not forwards compatible with
 42	  ext3; it is based on extent maps and it supports 48-bit
 43	  physical block numbers.  The ext4 filesystem also supports delayed
 44	  allocation, persistent preallocation, high resolution time stamps,
 45	  and a number of other features to improve performance and speed
 46	  up fsck time.  For more information, please see the web pages at
 47	  http://ext4.wiki.kernel.org.
 48
 49	  The ext4 filesystem supports mounting an ext3 filesystem; while there
 50	  are some performance gains from the delayed allocation and inode
 51	  table readahead, the best performance gains require enabling ext4
 52	  features in the filesystem using tune2fs, or formatting a new
 53	  filesystem as an ext4 filesystem initially. Without explicit enabling
 54	  of ext4 features, the on disk filesystem format stays fully backward
 55	  compatible.
 56
 57	  To compile this file system support as a module, choose M here. The
 58	  module will be called ext4.
 59
 60	  If unsure, say N.
 61
 62config EXT4_USE_FOR_EXT2
 63	bool "Use ext4 for ext2 file systems"
 64	depends on EXT4_FS
 65	depends on EXT2_FS=n
 66	default y
 67	help
 68	  Allow the ext4 file system driver code to be used for ext2
 69	  file system mounts.  This allows users to reduce their
 70	  compiled kernel size by using one file system driver for
 71	  ext2, ext3, and ext4 file systems.
 72
 
 
 
 
 
 
 
 
 
 
 
 
 
 73config EXT4_FS_POSIX_ACL
 74	bool "Ext4 POSIX Access Control Lists"
 75	depends on EXT4_FS
 76	select FS_POSIX_ACL
 77	help
 78	  POSIX Access Control Lists (ACLs) support permissions for users and
 79	  groups beyond the owner/group/world scheme.
 80
 
 
 
 81	  If you don't know what Access Control Lists are, say N
 82
 83config EXT4_FS_SECURITY
 84	bool "Ext4 Security Labels"
 85	depends on EXT4_FS
 86	help
 87	  Security labels support alternative access control models
 88	  implemented by security modules like SELinux.  This option
 89	  enables an extended attribute handler for file security
 90	  labels in the ext4 filesystem.
 91
 92	  If you are not using a security module that requires using
 93	  extended attributes for file security labels, say N.
 94
 95config EXT4_DEBUG
 96	bool "Ext4 debugging support"
 97	depends on EXT4_FS
 98	help
 99	  Enables run-time debugging support for the ext4 filesystem.
100
101	  If you select Y here, then you will be able to turn on debugging
102	  using dynamic debug control for mb_debug() / ext_debug() msgs.
103
104config EXT4_KUNIT_TESTS
105	tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS
106	select EXT4_FS
107	depends on KUNIT
108	default KUNIT_ALL_TESTS
109	help
110	  This builds the ext4 KUnit tests.
111
112	  KUnit tests run during boot and output the results to the debug log
113	  in TAP format (https://testanything.org/). Only useful for kernel devs
114	  running KUnit test harness and are not for inclusion into a production
115	  build.
116
117	  For more information on KUnit and unit tests in general please refer
118	  to the KUnit documentation in Documentation/dev-tools/kunit/.
119
120	  If unsure, say N.