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Date: Wed, 14 Oct 2015 16:38:18 +0900
From: Joonsoo Kim <js1304@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Stephan Mueller <smueller@...onox.de>,
linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v4 2/8] crypto/lzo: support contextless compression API
Now, contextless compression API is introduced and it can reduce
memory overhead in some cases. All compression algorithm will
support it.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
crypto/Kconfig | 1 +
crypto/lzo.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++----------
2 files changed, 69 insertions(+), 13 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index cfc42e6..d25746f 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1494,6 +1494,7 @@ config CRYPTO_DEFLATE
config CRYPTO_LZO
tristate "LZO compression algorithm"
select CRYPTO_ALGAPI
+ select CRYPTO_CCOMPRESS
select LZO_COMPRESS
select LZO_DECOMPRESS
help
diff --git a/crypto/lzo.c b/crypto/lzo.c
index 4b3e925..a6ae752 100644
--- a/crypto/lzo.c
+++ b/crypto/lzo.c
@@ -22,40 +22,56 @@
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/lzo.h>
+#include <crypto/compress.h>
struct lzo_ctx {
void *lzo_comp_mem;
};
+static void *lzo_alloc_context(struct crypto_ccomp *tfm)
+{
+ void *ctx;
+
+ ctx = kmalloc(LZO1X_MEM_COMPRESS,
+ GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
+ if (!ctx)
+ ctx = vmalloc(LZO1X_MEM_COMPRESS);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ return ctx;
+}
+
static int lzo_init(struct crypto_tfm *tfm)
{
struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
- ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS,
- GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
- if (!ctx->lzo_comp_mem)
- ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
- if (!ctx->lzo_comp_mem)
+ ctx->lzo_comp_mem = lzo_alloc_context(NULL);
+ if (IS_ERR(ctx->lzo_comp_mem))
return -ENOMEM;
return 0;
}
+static void lzo_free_context(struct crypto_ccomp *tfm, void *ctx)
+{
+ kvfree(ctx);
+}
+
static void lzo_exit(struct crypto_tfm *tfm)
{
struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
- kvfree(ctx->lzo_comp_mem);
+ lzo_free_context(NULL, ctx->lzo_comp_mem);
}
-static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+static int __lzo_compress(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
{
- struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
int err;
- err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
+ err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
if (err != LZO_E_OK)
return -EINVAL;
@@ -64,8 +80,16 @@ static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
return 0;
}
-static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+ struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
+}
+
+static int __lzo_decompress(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
{
int err;
size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
@@ -77,7 +101,12 @@ static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
*dlen = tmp_len;
return 0;
+}
+static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+ return __lzo_decompress(src, slen, dst, dlen, NULL);
}
static struct crypto_alg alg = {
@@ -92,14 +121,40 @@ static struct crypto_alg alg = {
.coa_decompress = lzo_decompress } }
};
+static struct ccomp_alg ccomp = {
+ .alloc_context = lzo_alloc_context,
+ .free_context = lzo_free_context,
+ .compress = __lzo_compress,
+ .decompress = __lzo_decompress,
+ .flags = CCOMP_TYPE_DECOMP_NOCTX,
+ .base = {
+ .cra_name = "lzo",
+ .cra_flags = CRYPTO_ALG_TYPE_CCOMPRESS,
+ .cra_module = THIS_MODULE,
+ }
+};
+
static int __init lzo_mod_init(void)
{
- return crypto_register_alg(&alg);
+ int ret;
+
+ ret = crypto_register_alg(&alg);
+ if (ret)
+ return ret;
+
+ ret = crypto_register_ccomp(&ccomp);
+ if (ret) {
+ crypto_unregister_alg(&alg);
+ return ret;
+ }
+
+ return ret;
}
static void __exit lzo_mod_fini(void)
{
crypto_unregister_alg(&alg);
+ crypto_unregister_ccomp(&ccomp);
}
module_init(lzo_mod_init);
--
1.9.1
--
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