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f2fs: compress: Allow modular (de)compression algorithms

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If F2FS_FS is modular, enabling the compressions options
F2FS_FS_{LZ4,LZ4HZ,LZO,LZORLE,ZSTD} will make the (de)compression
algorithms {LZ4,LZ4HC,LZO,ZSTD}_{,DE}COMPRESS builtin instead of
modular, as the former depend on an intermediate boolean
F2FS_FS_COMPRESSION, which in-turn depends on tristate F2FS_FS.

Indeed, if a boolean symbol A depends directly on a tristate symbol B
and selects another tristate symbol C:

    tristate B

    tristate C

    bool A
      depends on B
      select C

and B is modular, then C will also be modular.

However, if there is an intermediate boolean D in the dependency chain
between A and B:

    tristate B

    tristate C

    bool D
      depends on B

    bool A
      depends on D
      select C

then the modular state won't propagate from B to C, and C will be
builtin instead of modular.

As modular dependency propagation through intermediate symbols is
obscure, fix this in a robust way by moving the selection of tristate
(de)compression algorithms from the boolean compression options to the
tristate main F2FS_FS option.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2021-02-26 16:51:42 +01:00 committed by Jaegeuk Kim
parent 43f8c47ea7
commit 72f8588124
1 changed files with 7 additions and 9 deletions
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16
fs/f2fs/Kconfig
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@ -7,6 +7,13 @@ config F2FS_FS
select CRYPTO_CRC32
select F2FS_FS_XATTR if FS_ENCRYPTION
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
select LZ4_COMPRESS if F2FS_FS_LZ4
select LZ4_DECOMPRESS if F2FS_FS_LZ4
select LZ4HC_COMPRESS if F2FS_FS_LZ4HC
select LZO_COMPRESS if F2FS_FS_LZO
select LZO_DECOMPRESS if F2FS_FS_LZO
select ZSTD_COMPRESS if F2FS_FS_ZSTD
select ZSTD_DECOMPRESS if F2FS_FS_ZSTD
help
F2FS is based on Log-structured File System (LFS), which supports
versatile "flash-friendly" features. The design has been focused on
@ -94,8 +101,6 @@ config F2FS_FS_COMPRESSION
config F2FS_FS_LZO
bool "LZO compression support"
depends on F2FS_FS_COMPRESSION
select LZO_COMPRESS
select LZO_DECOMPRESS
default y
help
Support LZO compress algorithm, if unsure, say Y.
@ -103,8 +108,6 @@ config F2FS_FS_LZO
config F2FS_FS_LZ4
bool "LZ4 compression support"
depends on F2FS_FS_COMPRESSION
select LZ4_COMPRESS
select LZ4_DECOMPRESS
default y
help
Support LZ4 compress algorithm, if unsure, say Y.
@ -113,7 +116,6 @@ config F2FS_FS_LZ4HC
bool "LZ4HC compression support"
depends on F2FS_FS_COMPRESSION
depends on F2FS_FS_LZ4
select LZ4HC_COMPRESS
default y
help
Support LZ4HC compress algorithm, LZ4HC has compatible on-disk
@ -122,8 +124,6 @@ config F2FS_FS_LZ4HC
config F2FS_FS_ZSTD
bool "ZSTD compression support"
depends on F2FS_FS_COMPRESSION
select ZSTD_COMPRESS
select ZSTD_DECOMPRESS
default y
help
Support ZSTD compress algorithm, if unsure, say Y.
@ -132,8 +132,6 @@ config F2FS_FS_LZORLE
bool "LZO-RLE compression support"
depends on F2FS_FS_COMPRESSION
depends on F2FS_FS_LZO
select LZO_COMPRESS
select LZO_DECOMPRESS
default y
help
Support LZO-RLE compress algorithm, if unsure, say Y.