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Subject[PATCH v4] pstore: add lz4hc and 842 compression support
Date
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@gmail.com>
---
Changes in v4:
-842 compress is not work in patch v3 since big_oops_buf_sz is too big.
change big_oops_buf_sz from psinfo->bufsize * 2 to psinfo->bufsize.
Changes in v3:
-fix outlen in 842
Changes in v2:
-fix checkpatch.pl WARNING:
please write a paragraph that describes the config symbol fully
---
fs/pstore/Kconfig | 25 +++++++++
fs/pstore/platform.c | 147 ++++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 154 insertions(+), 18 deletions(-)

diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index b42e5bd6d8ff..cf97a3ecdce0 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -39,6 +39,31 @@ 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.
+
+ Currently, pstore has supported five compression algorithms:
+ zlib, lzo, lz4, lz4hc and 842.
+
+ The default compression algorithm is zlib.
+
+config PSTORE_842_COMPRESS
+ bool "842"
+ select 842_COMPRESS
+ select 842_DECOMPRESS
+ help
+ This option enables 842 compression algorithm support.
+
+ Currently, pstore has supported five compression algorithms:
+ zlib, lzo, lz4, lz4hc and 842.
+
+ The default compression algorithm is zlib.
+
endchoice

config PSTORE_CONSOLE
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c3129b131e4d..19aaefeb052f 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>
@@ -336,6 +339,33 @@ static const struct pstore_zbackend backend_lzo = {
};
#endif

+#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;
+
+ ret = LZ4_decompress_safe(in, out, inlen, outlen);
+ if (ret < 0) {
+ /*
+ * LZ4_decompress_safe will return an error code
+ * (< 0) if decompression failed
+ */
+ pr_err("LZ4_decompress_safe error, ret = %d!\n", ret);
+ return -EIO;
+ }
+
+ return ret;
+}
+
+static void free_lz4(void)
+{
+ kfree(workspace);
+ kfree(big_oops_buf);
+ 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)
{
@@ -350,29 +380,54 @@ static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
return ret;
}

-static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
+static void allocate_lz4(void)
+{
+ big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
+ big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
+ if (big_oops_buf) {
+ workspace = kmalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
+ if (!workspace) {
+ pr_err("No memory for compression workspace; skipping compression\n");
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ }
+ } else {
+ pr_err("No memory for uncompressed data; skipping compression\n");
+ workspace = NULL;
+ }
+}
+
+static const struct pstore_zbackend backend_lz4 = {
+ .compress = compress_lz4,
+ .decompress = decompress_lz4,
+ .allocate = allocate_lz4,
+ .free = free_lz4,
+ .name = "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_decompress_safe(in, out, inlen, outlen);
- if (ret < 0) {
- /*
- * LZ4_decompress_safe will return an error code
- * (< 0) if decompression failed
- */
- pr_err("LZ4_decompress_safe error, ret = %d!\n", 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 void allocate_lz4(void)
+static void allocate_lz4hc(void)
{
big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
- workspace = kmalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
+ workspace = kmalloc(LZ4HC_MEM_COMPRESS, GFP_KERNEL);
if (!workspace) {
pr_err("No memory for compression workspace; skipping compression\n");
kfree(big_oops_buf);
@@ -384,7 +439,59 @@ static void allocate_lz4(void)
}
}

-static void free_lz4(void)
+static const struct pstore_zbackend backend_lz4hc = {
+ .compress = compress_lz4hc,
+ .decompress = decompress_lz4,
+ .allocate = allocate_lz4hc,
+ .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;
+
+ ret = sw842_compress(in, inlen, out, (unsigned int *)&outlen, workspace);
+ if (ret) {
+ pr_err("sw842_compress error; compression failed!\n");
+ return ret;
+ }
+
+ return outlen;
+}
+
+static int decompress_842(void *in, void *out, size_t inlen, size_t outlen)
+{
+ int ret;
+
+ ret = sw842_decompress(in, inlen, out, (unsigned int *)&outlen);
+ if (ret) {
+ pr_err("sw842_decompress error, ret = %d!\n", ret);
+ return ret;
+ }
+
+ return outlen;
+}
+
+static void allocate_842(void)
+{
+ big_oops_buf_sz = psinfo->bufsize;
+ 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);
@@ -392,12 +499,12 @@ static void free_lz4(void)
big_oops_buf_sz = 0;
}

-static const struct pstore_zbackend backend_lz4 = {
- .compress = compress_lz4,
- .decompress = decompress_lz4,
- .allocate = allocate_lz4,
- .free = free_lz4,
- .name = "lz4",
+static const struct pstore_zbackend backend_842 = {
+ .compress = compress_842,
+ .decompress = decompress_842,
+ .allocate = allocate_842,
+ .free = free_842,
+ .name = "842",
};
#endif

@@ -408,6 +515,10 @@ 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
--
2.14.1
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