Commit 1021bcf4 authored by Geliang Tang's avatar Geliang Tang Committed by Kees Cook
Browse files

pstore: add zstd compression support 



This patch added the 6th compression algorithm support for pstore: zstd.

Signed-off-by: default avatarGeliang Tang <geliangtang@gmail.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 7daf201d

fs/pstore/Kconfig

+14 −3
Original line number Diff line number Diff line
@@ -50,12 +50,19 @@ config PSTORE_842_COMPRESS 
	help

	  This option enables 842 compression algorithm support.



config PSTORE_ZSTD_COMPRESS

	bool "zstd compression"

	depends on PSTORE

	select CRYPTO_ZSTD

	help

	  This option enables zstd compression algorithm support.



config PSTORE_COMPRESS

	def_bool y

	depends on PSTORE

	depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS ||	\

		   PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS ||	\

		   PSTORE_842_COMPRESS

		   PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS



choice

	prompt "Default pstore compression algorithm"
@@ -65,8 +72,8 @@ choice 
	  This change be changed at boot with "pstore.compress=..." on

	  the kernel command line.



	  Currently, pstore has support for 5 compression algorithms:

	  deflate, lzo, lz4, lz4hc and 842.

	  Currently, pstore has support for 6 compression algorithms:

	  deflate, lzo, lz4, lz4hc, 842 and zstd.



	  The default compression algorithm is deflate.
@@ -85,6 +92,9 @@ choice 
	config PSTORE_842_COMPRESS_DEFAULT

		bool "842" if PSTORE_842_COMPRESS



	config PSTORE_ZSTD_COMPRESS_DEFAULT

		bool "zstd" if PSTORE_ZSTD_COMPRESS



endchoice



config PSTORE_COMPRESS_DEFAULT
@@ -95,6 +105,7 @@ config PSTORE_COMPRESS_DEFAULT 
	default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT

	default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT

	default "842" if PSTORE_842_COMPRESS_DEFAULT

	default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT



config PSTORE_CONSOLE

	bool "Log kernel console messages"

fs/pstore/platform.c

+16 −0
Original line number Diff line number Diff line
@@ -34,6 +34,9 @@ 
#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)

#include <linux/lz4.h>

#endif

#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)

#include <linux/zstd.h>

#endif

#include <linux/crypto.h>

#include <linux/string.h>

#include <linux/timer.h>
@@ -192,6 +195,13 @@ static int zbufsize_842(size_t size) 
}

#endif



#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)

static int zbufsize_zstd(size_t size)

{

	return ZSTD_compressBound(size);

}

#endif



static const struct pstore_zbackend *zbackend __ro_after_init;



static const struct pstore_zbackend zbackends[] = {
@@ -224,6 +234,12 @@ static const struct pstore_zbackend zbackends[] = { 
		.zbufsize	= zbufsize_842,

		.name		= "842",

	},

#endif

#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)

	{

		.zbufsize	= zbufsize_zstd,

		.name		= "zstd",

	},

#endif

	{ }

};