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Message-ID: <20150827015730.GC1545@swordfish>
Date: Thu, 27 Aug 2015 10:57:30 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To: Joonsoo Kim <js1304@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Minchan Kim <minchan@...nel.org>,
Nitin Gupta <ngupta@...are.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Stephan Mueller <smueller@...onox.de>,
Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 4/8] crypto/lz4hc: support decompress_noctx
On (08/20/15 15:35), Joonsoo Kim wrote:
>
> lz4hc's decompression doesn't requires any scratch buffer so
> it doesn't need tfm context. Hence, it can support
> crypto compression noctx API and this patch implements it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
> crypto/lz4hc.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c
> index bcf0baa..a529620 100644
> --- a/crypto/lz4hc.c
> +++ b/crypto/lz4hc.c
> @@ -76,6 +76,21 @@ static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
> return err;
> }
>
> +static int lz4hc_decompress_noctx(const u8 *src, unsigned int slen,
> + u8 *dst, unsigned int *dlen)
> +{
> + int err;
> + size_t tmp_len = *dlen;
> + size_t __slen = slen;
> +
> + err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
> + if (err < 0)
> + return -EINVAL;
> +
> + *dlen = tmp_len;
> + return err;
> +}
> +
same,
static int lz4hc_decompress_noctx(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen)
{
return lz4hc_decompress_crypto(NULL, ....);
}
?
-ss
> static struct crypto_alg alg_lz4hc = {
> .cra_name = "lz4hc",
> .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
> @@ -88,7 +103,7 @@ static struct crypto_alg alg_lz4hc = {
> .coa_compress = lz4hc_compress_crypto,
> .coa_decompress = lz4hc_decompress_crypto,
> .coa_compress_noctx = NULL,
> - .coa_decompress_noctx = NULL } }
> + .coa_decompress_noctx = lz4hc_decompress_noctx } }
> };
>
> static int __init lz4hc_mod_init(void)
> --
> 1.9.1
>
--
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