On Fri, Sep 18, 2015 at 02:19:22PM +0900, Joonsoo Kim wrote:
> From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
>
> Introduce zcomp_decompress_begin()/zcomp_decompress_end() as a
> preparation for crypto API-powered zcomp.
>
> Change zcomp_decompress() signature to require zstrm parameter.
>
> Unlike zcomp_compress_begin(), zcomp_decompress_begin() may return
> zstrm if currently selected compression backend require zstrm for
> decompression or NULL if it does not.
>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
There is a trivial comment below.
> ---
> drivers/block/zram/zcomp.c | 3 ++-
> drivers/block/zram/zcomp.h | 3 ++-
> drivers/block/zram/zram_drv.c | 20 ++++++++++++++++----
> 3 files changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
> index fc13bf2..3456d5a 100644
> --- a/drivers/block/zram/zcomp.c
> +++ b/drivers/block/zram/zcomp.c
> @@ -336,7 +336,8 @@ int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
> zstrm->private);
> }
>
> -int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
> +int zcomp_decompress(struct zcomp *comp, struct zcomp_strm *zstrm,
> + const unsigned char *src,
> size_t src_len, unsigned char *dst)
> {
> return comp->backend->decompress(src, src_len, dst);
> diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
> index 616e013..4c09c01 100644
> --- a/drivers/block/zram/zcomp.h
> +++ b/drivers/block/zram/zcomp.h
> @@ -66,7 +66,8 @@ int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
> struct zcomp_strm *zcomp_decompress_begin(struct zcomp *comp);
> void zcomp_decompress_end(struct zcomp *comp, struct zcomp_strm *zstrm);
>
> -int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
> +int zcomp_decompress(struct zcomp *comp, struct zcomp_strm *zstrm,
> + const unsigned char *src,
> size_t src_len, unsigned char *dst);
>
> bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 20c41ed..55e09db1 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -560,7 +560,8 @@ static void zram_free_page(struct zram *zram, size_t index)
> zram_set_obj_size(meta, index, 0);
> }
>
> -static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
> +static int zram_decompress_page(struct zram *zram, struct zcomp_strm *zstrm,
> + char *mem, u32 index)
> {
> int ret = 0;
> unsigned char *cmem;
> @@ -582,7 +583,7 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
> if (size == PAGE_SIZE)
> copy_page(mem, cmem);
> else
> - ret = zcomp_decompress(zram->comp, cmem, size, mem);
> + ret = zcomp_decompress(zram->comp, zstrm, cmem, size, mem);
> zs_unmap_object(meta->mem_pool, handle);
> bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
>
> @@ -602,6 +603,7 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
> struct page *page;
> unsigned char *user_mem, *uncmem = NULL;
> struct zram_meta *meta = zram->meta;
> + struct zcomp_strm *zstrm = NULL;
No need to initialize with NULL.
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