From 1021bcf44d0e876b10f8739594ad7e6e9c746026 Mon Sep 17 00:00:00 2001
From: Geliang Tang <geliangtang@gmail.com>
Date: Wed, 1 Aug 2018 19:23:37 +0800
Subject: pstore: add zstd compression support

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

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 fs/pstore/platform.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'fs/pstore/platform.c')

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c238ab8ba31d..15e99d5a681d 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -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
 	{ }
 };
-- 
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