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The commit 643fa9612b ("fscrypt: remove filesystem specific
build config option") removed modular support for fs/crypto. This
causes the Crypto API to be built-in whenever fscrypt is enabled.
This makes it very difficult for me to test modular builds of
the Crypto API without disabling fscrypt which is a pain.
As fscrypt is still evolving and it's developing new ties with the
fs layer, it's hard to build it as a module for now.
However, the actual algorithms are not required until a filesystem
is mounted. Therefore we can allow them to be built as modules.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/20191227024700.7vrzuux32uyfdgum@gondor.apana.org.au
Signed-off-by: Eric Biggers <ebiggers@google.com>
127 lines
4.1 KiB
Plaintext
127 lines
4.1 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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# Ext3 configs are here for backward compatibility with old configs which may
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# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
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# kernels after the removal of ext3 driver.
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config EXT3_FS
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tristate "The Extended 3 (ext3) filesystem"
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# These must match EXT4_FS selects...
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select EXT4_FS
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select JBD2
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select CRC16
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select CRYPTO
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select CRYPTO_CRC32C
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help
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This config option is here only for backward compatibility. ext3
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filesystem is now handled by the ext4 driver.
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config EXT3_FS_POSIX_ACL
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bool "Ext3 POSIX Access Control Lists"
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depends on EXT3_FS
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select EXT4_FS_POSIX_ACL
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select FS_POSIX_ACL
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help
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This config option is here only for backward compatibility. ext3
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filesystem is now handled by the ext4 driver.
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config EXT3_FS_SECURITY
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bool "Ext3 Security Labels"
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depends on EXT3_FS
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select EXT4_FS_SECURITY
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help
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This config option is here only for backward compatibility. ext3
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filesystem is now handled by the ext4 driver.
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config EXT4_FS
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tristate "The Extended 4 (ext4) filesystem"
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# Please update EXT3_FS selects when changing these
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select JBD2
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select CRC16
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select CRYPTO
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select CRYPTO_CRC32C
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select FS_IOMAP
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select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
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help
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This is the next generation of the ext3 filesystem.
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Unlike the change from ext2 filesystem to ext3 filesystem,
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the on-disk format of ext4 is not forwards compatible with
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ext3; it is based on extent maps and it supports 48-bit
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physical block numbers. The ext4 filesystem also supports delayed
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allocation, persistent preallocation, high resolution time stamps,
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and a number of other features to improve performance and speed
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up fsck time. For more information, please see the web pages at
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http://ext4.wiki.kernel.org.
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The ext4 filesystem supports mounting an ext3 filesystem; while there
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are some performance gains from the delayed allocation and inode
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table readahead, the best performance gains require enabling ext4
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features in the filesystem using tune2fs, or formatting a new
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filesystem as an ext4 filesystem initially. Without explicit enabling
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of ext4 features, the on disk filesystem format stays fully backward
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compatible.
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To compile this file system support as a module, choose M here. The
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module will be called ext4.
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If unsure, say N.
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config EXT4_USE_FOR_EXT2
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bool "Use ext4 for ext2 file systems"
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depends on EXT4_FS
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depends on EXT2_FS=n
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default y
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help
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Allow the ext4 file system driver code to be used for ext2
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file system mounts. This allows users to reduce their
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compiled kernel size by using one file system driver for
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ext2, ext3, and ext4 file systems.
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config EXT4_FS_POSIX_ACL
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bool "Ext4 POSIX Access Control Lists"
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depends on EXT4_FS
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select FS_POSIX_ACL
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help
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POSIX Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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If you don't know what Access Control Lists are, say N
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config EXT4_FS_SECURITY
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bool "Ext4 Security Labels"
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depends on EXT4_FS
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help
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Security labels support alternative access control models
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implemented by security modules like SELinux. This option
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enables an extended attribute handler for file security
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labels in the ext4 filesystem.
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If you are not using a security module that requires using
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extended attributes for file security labels, say N.
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config EXT4_DEBUG
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bool "Ext4 debugging support"
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depends on EXT4_FS
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help
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Enables run-time debugging support for the ext4 filesystem.
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If you select Y here, then you will be able to turn on debugging
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with a command such as:
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echo 1 > /sys/module/ext4/parameters/mballoc_debug
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config EXT4_KUNIT_TESTS
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bool "KUnit tests for ext4"
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select EXT4_FS
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depends on KUNIT
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help
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This builds the ext4 KUnit tests.
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KUnit tests run during boot and output the results to the debug log
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in TAP format (http://testanything.org/). Only useful for kernel devs
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running KUnit test harness and are not for inclusion into a production
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build.
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For more information on KUnit and unit tests in general please refer
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to the KUnit documentation in Documentation/dev-tools/kunit/.
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If unsure, say N.
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