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Date: Mon, 28 Aug 2017 21:56:40 +0800
From: Geliang Tang <geliangtang@...il.com>
To: Kees Cook <keescook@...omium.org>,
Anton Vorontsov <anton@...msg.org>,
Colin Cross <ccross@...roid.com>,
Tony Luck <tony.luck@...el.com>
Cc: Geliang Tang <geliangtang@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] pstore: add lz4hc and 842 compression support
Currently, pstore has supported three compression algorithms: zlib,
lzo and lz4. This patch added two more compression algorithms: lz4hc
and 842.
Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
fs/pstore/Kconfig | 14 ++++++
fs/pstore/platform.c | 128 +++++++++++++++++++++++++++++++++++++++++++++------
2 files changed, 127 insertions(+), 15 deletions(-)
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index b42e5bd..e288596 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -39,6 +39,20 @@ config PSTORE_LZ4_COMPRESS
select LZ4_DECOMPRESS
help
This option enables LZ4 compression algorithm support.
+
+config PSTORE_LZ4HC_COMPRESS
+ bool "LZ4HC"
+ select LZ4HC_COMPRESS
+ select LZ4_DECOMPRESS
+ help
+ This option enables LZ4 high compression mode algorithm.
+
+config PSTORE_842_COMPRESS
+ bool "842"
+ select 842_COMPRESS
+ select 842_DECOMPRESS
+ help
+ This option enables 842 compression algorithm support.
endchoice
config PSTORE_CONSOLE
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 2b21d18..252c320 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -34,9 +34,12 @@
#ifdef CONFIG_PSTORE_LZO_COMPRESS
#include <linux/lzo.h>
#endif
-#ifdef CONFIG_PSTORE_LZ4_COMPRESS
+#if defined(CONFIG_PSTORE_LZ4_COMPRESS) || defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
#include <linux/lz4.h>
#endif
+#ifdef CONFIG_PSTORE_842_COMPRESS
+#include <linux/sw842.h>
+#endif
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
@@ -337,20 +340,7 @@ static const struct pstore_zbackend backend_lzo = {
};
#endif
-#ifdef CONFIG_PSTORE_LZ4_COMPRESS
-static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
-{
- int ret;
-
- ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
- if (!ret) {
- pr_err("LZ4_compress_default error; compression failed!\n");
- return -EIO;
- }
-
- return ret;
-}
-
+#if defined(CONFIG_PSTORE_LZ4_COMPRESS) || defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
@@ -392,6 +382,21 @@ static void free_lz4(void)
big_oops_buf = NULL;
big_oops_buf_sz = 0;
}
+#endif
+
+#ifdef CONFIG_PSTORE_LZ4_COMPRESS
+static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
+{
+ int ret;
+
+ ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
+ if (!ret) {
+ pr_err("LZ4_compress_default error; compression failed!\n");
+ return -EIO;
+ }
+
+ return ret;
+}
static const struct pstore_zbackend backend_lz4 = {
.compress = compress_lz4,
@@ -402,6 +407,95 @@ static const struct pstore_zbackend backend_lz4 = {
};
#endif
+#ifdef CONFIG_PSTORE_LZ4HC_COMPRESS
+static int compress_lz4hc(const void *in, void *out,
+ size_t inlen, size_t outlen)
+{
+ int ret;
+
+ ret = LZ4_compress_HC(in, out, inlen, outlen,
+ LZ4HC_DEFAULT_CLEVEL, workspace);
+ if (!ret) {
+ pr_err("LZ4_compress_HC error; compression failed!\n");
+ return -EIO;
+ }
+
+ return ret;
+}
+
+static const struct pstore_zbackend backend_lz4hc = {
+ .compress = compress_lz4hc,
+ .decompress = decompress_lz4,
+ .allocate = allocate_lz4,
+ .free = free_lz4,
+ .name = "lz4hc",
+};
+#endif
+
+#ifdef CONFIG_PSTORE_842_COMPRESS
+static int compress_842(const void *in, void *out, size_t inlen, size_t outlen)
+{
+ int ret;
+ unsigned int len;
+
+ ret = sw842_compress(in, inlen, out, &len, workspace);
+ if (!ret) {
+ pr_err("sw842_compress error; compression failed!\n");
+ return -EIO;
+ }
+ outlen = len;
+
+ return ret;
+}
+
+static int decompress_842(void *in, void *out, size_t inlen, size_t outlen)
+{
+ int ret;
+ unsigned int len;
+
+ ret = sw842_decompress(in, inlen, out, &len);
+ if (ret < 0) {
+ pr_err("sw842_decompress error, ret = %d!\n", ret);
+ return -EIO;
+ }
+ outlen = len;
+
+ return ret;
+}
+
+static void allocate_842(void)
+{
+ big_oops_buf_sz = psinfo->bufsize * 2;
+ big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
+ if (big_oops_buf) {
+ workspace = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
+ if (!workspace) {
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ }
+ } else {
+ pr_err("No memory for uncompressed data; skipping compression\n");
+ workspace = NULL;
+ }
+}
+
+static void free_842(void)
+{
+ kfree(workspace);
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ big_oops_buf_sz = 0;
+}
+
+static const struct pstore_zbackend backend_842 = {
+ .compress = compress_842,
+ .decompress = decompress_842,
+ .allocate = allocate_842,
+ .free = free_842,
+ .name = "842",
+};
+#endif
+
static const struct pstore_zbackend *zbackend =
#if defined(CONFIG_PSTORE_ZLIB_COMPRESS)
&backend_zlib;
@@ -409,6 +503,10 @@ static const struct pstore_zbackend *zbackend =
&backend_lzo;
#elif defined(CONFIG_PSTORE_LZ4_COMPRESS)
&backend_lz4;
+#elif defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
+ &backend_lz4hc;
+#elif defined(CONFIG_PSTORE_842_COMPRESS)
+ &backend_842;
#else
NULL;
#endif
--
2.9.3
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