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....@lge.com>
---
crypto/lz4.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 67 insertions(+), 10 deletions(-)
diff --git a/crypto/lz4.c b/crypto/lz4.c
index aefbcea..9720409 100644
--- a/crypto/lz4.c
+++ b/crypto/lz4.c
@@ -23,36 +23,53 @@
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/lz4.h>
+#include <crypto/compress.h>
struct lz4_ctx {
void *lz4_comp_mem;
};
+static void *lz4_alloc_context(struct crypto_ccomp *tfm)
+{
+ void *ctx;
+
+ ctx = vmalloc(LZ4_MEM_COMPRESS);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ return ctx;
+}
+
static int lz4_init(struct crypto_tfm *tfm)
{
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
- ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS);
- if (!ctx->lz4_comp_mem)
+ ctx->lz4_comp_mem = lz4_alloc_context(NULL);
+ if (IS_ERR(ctx->lz4_comp_mem))
return -ENOMEM;
return 0;
}
+static void lz4_free_context(struct crypto_ccomp *tfm, void *ctx)
+{
+ vfree(ctx);
+}
+
static void lz4_exit(struct crypto_tfm *tfm)
{
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
- vfree(ctx->lz4_comp_mem);
+
+ lz4_free_context(NULL, ctx->lz4_comp_mem);
}
-static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
{
- struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
size_t tmp_len = *dlen;
int err;
- err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem);
+ err = lz4_compress(src, slen, dst, &tmp_len, ctx);
if (err < 0)
return -EINVAL;
@@ -61,8 +78,16 @@ static int lz4_compress_crypto(struct crypto_tfm *tfm, const
u8 *src,
return 0;
}
-static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+ struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
+}
+
+static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
{
int err;
size_t tmp_len = *dlen;
@@ -76,6 +101,12 @@ static int lz4_decompress_crypto(struct crypto_tfm *tfm,
const u8 *src,
return err;
}
+static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+ return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
+}
+
static struct crypto_alg alg_lz4 = {
.cra_name = "lz4",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@@ -89,14 +120,40 @@ static struct crypto_alg alg_lz4 = {
.coa_decompress = lz4_decompress_crypto } }
};
+static struct ccomp_alg ccomp = {
+ .alloc_context = lz4_alloc_context,
+ .free_context = lz4_free_context,
+ .compress = __lz4_compress_crypto,
+ .decompress = __lz4_decompress_crypto,
+ .flags = CCOMP_TYPE_DECOMP_NOCTX,
+ .base = {
+ .cra_name = "lz4",
+ .cra_flags = CRYPTO_ALG_TYPE_CCOMPRESS,
+ .cra_module = THIS_MODULE,
+ }
+};
+
static int __init lz4_mod_init(void)
{
- return crypto_register_alg(&alg_lz4);
+ int ret;
+
+ ret = crypto_register_alg(&alg_lz4);
+ if (ret)
+ return ret;
+
+ ret = crypto_register_ccomp(&ccomp);
+ if (ret) {
+ crypto_unregister_alg(&alg_lz4);
+ return ret;
+ }
+
+ return ret;
}
static void __exit lz4_mod_fini(void)
{
crypto_unregister_alg(&alg_lz4);
+ crypto_unregister_ccomp(&ccomp);
}
module_init(lz4_mod_init);
--
1.9.1
--
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