The patch titled
Subject: zram: add lzo and lzorle compression backends support
has been added to the -mm mm-unstable branch. Its filename is
zram-add-lzo-and-lzorle-compression-backends-support.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-add-lzo-and-lzorle-compression-backends-support.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: zram: add lzo and lzorle compression backends support
Date: Wed, 15 May 2024 16:12:39 +0900
Add s/w lzo/lzorle compression support.
Link: https://lkml.kernel.org/r/20240515071645.1788128-3-senozhatsky@xxxxxxxxxxxx
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nick Terrell <terrelln@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/Kconfig | 23 +++++++++++++
drivers/block/zram/Makefile | 3 +
drivers/block/zram/backend_lzo.c | 44 ++++++++++++++++++++++++++
drivers/block/zram/backend_lzo.h | 10 +++++
drivers/block/zram/backend_lzorle.c | 44 ++++++++++++++++++++++++++
drivers/block/zram/backend_lzorle.h | 10 +++++
drivers/block/zram/zcomp.c | 7 ++++
7 files changed, 141 insertions(+)
--- /dev/null
+++ a/drivers/block/zram/backend_lzo.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/lzo.h>
+
+#include "backend_lzo.h"
+
+static void *lzo_create(void)
+{
+ return kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
+}
+
+static void lzo_destroy(void *ctx)
+{
+ kfree(ctx);
+}
+
+static int lzo_compress(void *ctx, const unsigned char *src,
+ unsigned char *dst, size_t *dst_len)
+{
+ int ret;
+
+ ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, ctx);
+ return ret == LZO_E_OK ? 0 : ret;
+}
+
+static int lzo_decompress(void *ctx, const unsigned char *src, size_t src_len,
+ unsigned char *dst)
+{
+ size_t dst_len = PAGE_SIZE;
+ int ret;
+
+ ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
+ return ret == LZO_E_OK ? 0 : ret;
+}
+
+struct zcomp_backend backend_lzo = {
+ .compress = lzo_compress,
+ .decompress = lzo_decompress,
+ .create_ctx = lzo_create,
+ .destroy_ctx = lzo_destroy,
+ .name = "lzo",
+};
--- /dev/null
+++ a/drivers/block/zram/backend_lzo.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef __BACKEND_LZO_H__
+#define __BACKEND_LZO_H__
+
+#include "zcomp.h"
+
+extern struct zcomp_backend backend_lzo;
+
+#endif /* __BACKEND_LZO_H__ */
--- /dev/null
+++ a/drivers/block/zram/backend_lzorle.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/lzo.h>
+
+#include "backend_lzorle.h"
+
+static void *lzorle_create(void)
+{
+ return kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
+}
+
+static void lzorle_destroy(void *ctx)
+{
+ kfree(ctx);
+}
+
+static int lzorle_compress(void *ctx, const unsigned char *src,
+ unsigned char *dst, size_t *dst_len)
+{
+ int ret;
+
+ ret = lzorle1x_1_compress(src, PAGE_SIZE, dst, dst_len, ctx);
+ return ret == LZO_E_OK ? 0 : ret;
+}
+
+static int lzorle_decompress(void *ctx, const unsigned char *src,
+ size_t src_len, unsigned char *dst)
+{
+ size_t dst_len = PAGE_SIZE;
+ int ret;
+
+ ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
+ return ret == LZO_E_OK ? 0 : ret;
+}
+
+struct zcomp_backend backend_lzorle = {
+ .compress = lzorle_compress,
+ .decompress = lzorle_decompress,
+ .create_ctx = lzorle_create,
+ .destroy_ctx = lzorle_destroy,
+ .name = "lzo-rle",
+};
--- /dev/null
+++ a/drivers/block/zram/backend_lzorle.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef __BACKEND_LZORLE_H__
+#define __BACKEND_LZORLE_H__
+
+#include "zcomp.h"
+
+extern struct zcomp_backend backend_lzorle;
+
+#endif /* __BACKEND_LZORLE_H__ */
--- a/drivers/block/zram/Kconfig~zram-add-lzo-and-lzorle-compression-backends-support
+++ a/drivers/block/zram/Kconfig
@@ -14,8 +14,31 @@ config ZRAM
See Documentation/admin-guide/blockdev/zram.rst for more information.
+config ZRAM_BACKEND_LZO
+ bool "lzo and lzo-rle compression support"
+ depends on ZRAM
+ select LZO_COMPRESS
+ select LZO_DECOMPRESS
+
+choice
+ prompt "Default zram compressor"
+ default ZRAM_DEF_COMP_LZORLE
+ depends on ZRAM
+
+config ZRAM_DEF_COMP_LZORLE
+ bool "lzo-rle"
+ depends on ZRAM_BACKEND_LZO
+
+config ZRAM_DEF_COMP_LZO
+ bool "lzo"
+ depends on ZRAM_BACKEND_LZO
+
+endchoice
+
config ZRAM_DEF_COMP
string
+ default "lzo-rle" if ZRAM_DEF_COMP_LZORLE
+ default "lzo" if ZRAM_DEF_COMP_LZO
default "unset-value"
config ZRAM_WRITEBACK
--- a/drivers/block/zram/Makefile~zram-add-lzo-and-lzorle-compression-backends-support
+++ a/drivers/block/zram/Makefile
@@ -1,4 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
+
zram-y := zcomp.o zram_drv.o
+zram-$(CONFIG_ZRAM_BACKEND_LZO) += backend_lzorle.o backend_lzo.o
+
obj-$(CONFIG_ZRAM) += zram.o
--- a/drivers/block/zram/zcomp.c~zram-add-lzo-and-lzorle-compression-backends-support
+++ a/drivers/block/zram/zcomp.c
@@ -15,7 +15,14 @@
#include "zcomp.h"
+#include "backend_lzo.h"
+#include "backend_lzorle.h"
+
static struct zcomp_backend *backends[] = {
+#if IS_ENABLED(CONFIG_ZRAM_BACKEND_LZO)
+ &backend_lzorle,
+ &backend_lzo,
+#endif
NULL
};
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
zram-move-from-crypto-api-to-custom-comp-backends-api.patch
zram-add-lzo-and-lzorle-compression-backends-support.patch
zram-add-lz4-compression-backend-support.patch
zram-add-lz4hc-compression-backend-support.patch
zram-add-zstd-compression-backend-support.patch
zram-pass-estimated-src-size-hint-to-zstd.patch
zram-add-zlib-compression-backend-support.patch
zram-add-842-compression-backend-support.patch
zram-check-that-backends-array-has-at-least-one-backend.patch
zram-introduce-zcomp_config-structure.patch
zram-extend-comp_algorithm-attr-write-handling.patch
zram-support-compression-level-comp-config.patch
zram-add-support-for-dict-comp-config.patch
lib-zstd-export-api-needed-for-dictionary-support.patch
zram-add-dictionary-support-to-zstd-backend.patch
zram-add-config-init-release-backend-callbacks.patch
zram-share-dictionaries-between-per-cpu-contexts.patch
zram-add-dictionary-support-to-lz4.patch
lib-lz4hc-export-lz4_resetstreamhc-symbol.patch
zram-add-dictionary-support-to-lz4hc.patch
documentation-zram-add-documentation-for-algorithm-parameters.patch
