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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>
102 lines
3.3 KiB
Plaintext
102 lines
3.3 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config UBIFS_FS
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tristate "UBIFS file system support"
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select CRC16
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select CRC32
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select CRYPTO if UBIFS_FS_ADVANCED_COMPR
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select CRYPTO if UBIFS_FS_LZO
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select CRYPTO if UBIFS_FS_ZLIB
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select CRYPTO if UBIFS_FS_ZSTD
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select CRYPTO_LZO if UBIFS_FS_LZO
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select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
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select CRYPTO_ZSTD if UBIFS_FS_ZSTD
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select CRYPTO_HASH_INFO
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select UBIFS_FS_XATTR if FS_ENCRYPTION
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select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
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depends on MTD_UBI
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help
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UBIFS is a file system for flash devices which works on top of UBI.
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if UBIFS_FS
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config UBIFS_FS_ADVANCED_COMPR
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bool "Advanced compression options"
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help
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This option allows to explicitly choose which compressions, if any,
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are enabled in UBIFS. Removing compressors means inability to read
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existing file systems.
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If unsure, say 'N'.
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config UBIFS_FS_LZO
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bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
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default y
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help
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LZO compressor is generally faster than zlib but compresses worse.
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Say 'Y' if unsure.
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config UBIFS_FS_ZLIB
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bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
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default y
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help
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Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
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config UBIFS_FS_ZSTD
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bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
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depends on UBIFS_FS
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default y
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help
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ZSTD compresses is a big win in speed over Zlib and
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in compression ratio over LZO. Say 'Y' if unsure.
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config UBIFS_ATIME_SUPPORT
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bool "Access time support"
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default n
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help
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Originally UBIFS did not support atime, because it looked like a bad idea due
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increased flash wear. This option adds atime support and it is disabled by default
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to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
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which means that file-system read operations will cause writes (inode atime
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updates). This may affect file-system performance and increase flash device wear,
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so be careful. How often atime is updated depends on the selected strategy:
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strictatime is the "heavy", relatime is "lighter", etc.
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If unsure, say 'N'
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config UBIFS_FS_XATTR
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bool "UBIFS XATTR support"
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default y
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help
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Saying Y here includes support for extended attributes (xattrs).
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Xattrs are name:value pairs associated with inodes by
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the kernel or by users (see the attr(5) manual page).
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If unsure, say Y.
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config UBIFS_FS_SECURITY
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bool "UBIFS Security Labels"
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depends on UBIFS_FS_XATTR
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default y
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help
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Security labels provide an access control facility to support Linux
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Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
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Linux. This option enables an extended attribute handler for file
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security labels in the ubifs filesystem, so that it requires enabling
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the extended attribute support in advance.
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If you are not using a security module, say N.
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config UBIFS_FS_AUTHENTICATION
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bool "UBIFS authentication support"
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select KEYS
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select CRYPTO_HMAC
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select SYSTEM_DATA_VERIFICATION
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help
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Enable authentication support for UBIFS. This feature offers protection
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against offline changes for both data and metadata of the filesystem.
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If you say yes here you should also select a hashing algorithm such as
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sha256, these are not selected automatically since there are many
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different options.
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endif # UBIFS_FS
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