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.
5 tristate "The Extended 3 (ext3) filesystem"
6 # These must match EXT4_FS selects...
13 This config option is here only for backward compatibility. ext3
14 filesystem is now handled by the ext4 driver.
16 config EXT3_FS_POSIX_ACL
17 bool "Ext3 POSIX Access Control Lists"
19 select EXT4_FS_POSIX_ACL
22 This config option is here only for backward compatibility. ext3
23 filesystem is now handled by the ext4 driver.
25 config EXT3_FS_SECURITY
26 bool "Ext3 Security Labels"
28 select EXT4_FS_SECURITY
30 This config option is here only for backward compatibility. ext3
31 filesystem is now handled by the ext4 driver.
34 tristate "The Extended 4 (ext4) filesystem"
35 # Please update EXT3_FS selects when changing these
41 This is the next generation of the ext3 filesystem.
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.
52 The ext4 filesystem supports mounting an ext3 filesystem; while there
53 are some performance gains from the delayed allocation and inode
54 table readahead, the best performance gains require enabling ext4
55 features in the filesystem using tune2fs, or formatting a new
56 filesystem as an ext4 filesystem initially. Without explicit enabling
57 of ext4 features, the on disk filesystem format stays fully backward
60 To compile this file system support as a module, choose M here. The
61 module will be called ext4.
65 config EXT4_USE_FOR_EXT2
66 bool "Use ext4 for ext2/ext3 file systems"
71 Allow the ext4 file system driver code to be used for ext2
72 file system mounts. This allows users to reduce their
73 compiled kernel size by using one file system driver for
74 ext2, ext3, and ext4 file systems.
76 config EXT4_FS_POSIX_ACL
77 bool "Ext4 POSIX Access Control Lists"
81 POSIX Access Control Lists (ACLs) support permissions for users and
82 groups beyond the owner/group/world scheme.
84 To learn more about Access Control Lists, visit the POSIX ACLs for
85 Linux website <http://acl.bestbits.at/>.
87 If you don't know what Access Control Lists are, say N
89 config EXT4_FS_SECURITY
90 bool "Ext4 Security Labels"
93 Security labels support alternative access control models
94 implemented by security modules like SELinux. This option
95 enables an extended attribute handler for file security
96 labels in the ext4 filesystem.
98 If you are not using a security module that requires using
99 extended attributes for file security labels, say N.
101 config EXT4_ENCRYPTION
102 tristate "Ext4 Encryption"
112 select ENCRYPTED_KEYS
114 Enable encryption of ext4 files and directories. This
115 feature is similar to ecryptfs, but it is more memory
116 efficient since it avoids caching the encrypted and
117 decrypted pages in the page cache.
119 config EXT4_FS_ENCRYPTION
122 depends on EXT4_ENCRYPTION
125 bool "EXT4 debugging support"
128 Enables run-time debugging support for the ext4 filesystem.
130 If you select Y here, then you will be able to turn on debugging
131 with a command such as:
132 echo 1 > /sys/module/ext4/parameters/mballoc_debug