From: Joonsoo Kim Subject: [PATCH v4 4/8] crypto/deflate: support contextless compression API Date: Wed, 14 Oct 2015 16:38:20 +0900 Message-ID: <1444808304-29320-5-git-send-email-iamjoonsoo.kim@lge.com> References: <1444808304-29320-1-git-send-email-iamjoonsoo.kim@lge.com> Cc: Minchan Kim , Nitin Gupta , Sergey Senozhatsky , Herbert Xu , "David S. Miller" , Stephan Mueller , linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, Joonsoo Kim To: Andrew Morton Return-path: In-Reply-To: <1444808304-29320-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org 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 --- crypto/deflate.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 86 insertions(+), 10 deletions(-) diff --git a/crypto/deflate.c b/crypto/deflate.c index 95d8d37..7070438 100644 --- a/crypto/deflate.c +++ b/crypto/deflate.c @@ -32,6 +32,7 @@ #include #include #include +#include #define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION #define DEFLATE_DEF_WINBITS 11 @@ -101,9 +102,8 @@ static void deflate_decomp_exit(struct deflate_ctx *ctx) vfree(ctx->decomp_stream.workspace); } -static int deflate_init(struct crypto_tfm *tfm) +static int __deflate_init(void *ctx) { - struct deflate_ctx *ctx = crypto_tfm_ctx(tfm); int ret; ret = deflate_comp_init(ctx); @@ -116,19 +116,54 @@ out: return ret; } -static void deflate_exit(struct crypto_tfm *tfm) +static void *deflate_alloc_context(struct crypto_ccomp *tfm) +{ + void *ctx; + int ret; + + ctx = kzalloc(sizeof(struct deflate_ctx), GFP_KERNEL); + if (!ctx) + return ERR_PTR(-ENOMEM); + + ret = __deflate_init(ctx); + if (ret) { + kfree(ctx); + return ERR_PTR(ret); + } + + return ctx; +} + +static int deflate_init(struct crypto_tfm *tfm) { struct deflate_ctx *ctx = crypto_tfm_ctx(tfm); + return __deflate_init(ctx); +} + +static void __deflate_exit(void *ctx) +{ deflate_comp_exit(ctx); deflate_decomp_exit(ctx); } -static int deflate_compress(struct crypto_tfm *tfm, const u8 *src, - unsigned int slen, u8 *dst, unsigned int *dlen) +static void deflate_free_context(struct crypto_ccomp *tfm, void *ctx) +{ + __deflate_exit(ctx); +} + +static void deflate_exit(struct crypto_tfm *tfm) +{ + struct deflate_ctx *ctx = crypto_tfm_ctx(tfm); + + __deflate_exit(ctx); +} + +static int __deflate_compress(const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen, void *ctx) { int ret = 0; - struct deflate_ctx *dctx = crypto_tfm_ctx(tfm); + struct deflate_ctx *dctx = ctx; struct z_stream_s *stream = &dctx->comp_stream; ret = zlib_deflateReset(stream); @@ -153,12 +188,20 @@ out: return ret; } -static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src, - unsigned int slen, u8 *dst, unsigned int *dlen) +static int deflate_compress(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + struct deflate_ctx *dctx = crypto_tfm_ctx(tfm); + + return __deflate_compress(src, slen, dst, dlen, dctx); +} + +static int __deflate_decompress(const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen, void *ctx) { int ret = 0; - struct deflate_ctx *dctx = crypto_tfm_ctx(tfm); + struct deflate_ctx *dctx = ctx; struct z_stream_s *stream = &dctx->decomp_stream; ret = zlib_inflateReset(stream); @@ -194,6 +237,14 @@ out: return ret; } +static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + struct deflate_ctx *dctx = crypto_tfm_ctx(tfm); + + return __deflate_compress(src, slen, dst, dlen, dctx); +} + static struct crypto_alg alg = { .cra_name = "deflate", .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, @@ -206,14 +257,39 @@ static struct crypto_alg alg = { .coa_decompress = deflate_decompress } } }; +static struct ccomp_alg ccomp = { + .alloc_context = deflate_alloc_context, + .free_context = deflate_free_context, + .compress = __deflate_compress, + .decompress = __deflate_decompress, + .base = { + .cra_name = "deflate", + .cra_flags = CRYPTO_ALG_TYPE_CCOMPRESS, + .cra_module = THIS_MODULE, + } +}; + static int __init deflate_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 deflate_mod_fini(void) { crypto_unregister_alg(&alg); + crypto_unregister_ccomp(&ccomp); } module_init(deflate_mod_init); -- 1.9.1