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Date: Thu, 15 Oct 2015 09:38:41 +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>,
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: Re: [PATCH v4 7/8] zram: use crypto contextless compression API to
(de)compress
Hi,
On (10/14/15 16:38), Joonsoo Kim wrote:
[..]
> Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
> @@ -18,9 +17,8 @@ config ZRAM
> config ZRAM_LZ4_COMPRESS
> bool "Enable LZ4 algorithm support"
> depends on ZRAM
> - select LZ4_COMPRESS
> - select LZ4_DECOMPRESS
> + select CRYPTO_LZ4
> default n
> help
> This option enables LZ4 compression algorithm support. Compression
> - algorithm can be changed using `comp_algorithm' device attribute.
> \ No newline at end of file
> + algorithm can be changed using `comp_algorithm' device attribute.
> diff --git a/drivers/block/zram/Makefile b/drivers/block/zram/Makefile
> index be0763f..9e2b79e 100644
> --- a/drivers/block/zram/Makefile
> +++ b/drivers/block/zram/Makefile
> @@ -1,5 +1,3 @@
> -zram-y := zcomp_lzo.o zcomp.o zram_drv.o
> -
> -zram-$(CONFIG_ZRAM_LZ4_COMPRESS) += zcomp_lz4.o
> +zram-y := zcomp.o zram_drv.o
+ git rm zcomp_lzo.* zcomp_lz4.* :)
> obj-$(CONFIG_ZRAM) += zram.o
> diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
> index e3016da..9be83db 100644
> --- a/drivers/block/zram/zcomp.c
> +++ b/drivers/block/zram/zcomp.c
> @@ -15,10 +15,6 @@
> #include <linux/sched.h>
>
> #include "zcomp.h"
> -#include "zcomp_lzo.h"
> -#ifdef CONFIG_ZRAM_LZ4_COMPRESS
> -#include "zcomp_lz4.h"
> -#endif
>
> /*
> * single zcomp_strm backend
> @@ -43,19 +39,20 @@ struct zcomp_strm_multi {
> wait_queue_head_t strm_wait;
> };
>
> -static struct zcomp_backend *backends[] = {
> - &zcomp_lzo,
> +static const char * const backends[] = {
> + "lzo",
> #ifdef CONFIG_ZRAM_LZ4_COMPRESS
a nitpick -- this CONFIG option does not exist at this point.
> - &zcomp_lz4,
> + "lz4",
> #endif
> NULL
> };
>
> -static struct zcomp_backend *find_backend(const char *compress)
> +static const char *find_backend(const char *compress)
> {
> int i = 0;
> while (backends[i]) {
> - if (sysfs_streq(compress, backends[i]->name))
> + if (sysfs_streq(compress, backends[i]) &&
> + crypto_has_comp(backends[i], 0, 0))
again (the same as in my previous email). I'd rather prefer to have
FOO backends in ` const char * const backends[]' array only when the
corresponding CONFIG_CRYPTO_FOO option has been selected. otherwise you
have to find an intersection of two independent sets. sort of unreasonable
to me.
> break;
> i++;
> }
> @@ -65,7 +62,7 @@ static struct zcomp_backend *find_backend(const char *compress)
> static void zcomp_strm_free(struct zcomp *comp, struct zcomp_strm *zstrm)
> {
> if (zstrm->private)
> - comp->backend->destroy(zstrm->private);
> + crypto_ccomp_free_context(comp->tfm, zstrm->private);
> free_pages((unsigned long)zstrm->buffer, 1);
> kfree(zstrm);
> }
> @@ -80,7 +77,13 @@ static struct zcomp_strm *zcomp_strm_alloc(struct zcomp *comp)
> if (!zstrm)
> return NULL;
>
> - zstrm->private = comp->backend->create();
> + zstrm->private = crypto_ccomp_alloc_context(comp->tfm);
> + if (IS_ERR(zstrm->private)) {
> + zstrm->private = NULL;
> + zcomp_strm_free(comp, zstrm);
> + return NULL;
> + }
> +
> /*
> * allocate 2 pages. 1 for compressed data, plus 1 extra for the
> * case when compressed size is larger than the original one
> @@ -274,12 +277,12 @@ ssize_t zcomp_available_show(const char *comp, char *buf)
> int i = 0;
>
> while (backends[i]) {
> - if (!strcmp(comp, backends[i]->name))
> + if (!strcmp(comp, backends[i]))
> sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,
> - "[%s] ", backends[i]->name);
> + "[%s] ", backends[i]);
> else
> sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,
> - "%s ", backends[i]->name);
> + "%s ", backends[i]);
> i++;
> }
> sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n");
> @@ -320,7 +323,10 @@ void zcomp_compress_end(struct zcomp *comp, struct zcomp_strm *zstrm)
> /* May return NULL, may sleep */
> struct zcomp_strm *zcomp_decompress_begin(struct zcomp *comp)
> {
> - return NULL;
> + if (crypto_ccomp_decomp_noctx(comp->tfm))
> + return NULL;
> +
> + return zcomp_strm_find(comp);
> }
>
> void zcomp_decompress_end(struct zcomp *comp, struct zcomp_strm *zstrm)
> @@ -330,22 +336,29 @@ void zcomp_decompress_end(struct zcomp *comp, struct zcomp_strm *zstrm)
> }
>
> int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
> - const unsigned char *src, size_t *dst_len)
> + const unsigned char *src, unsigned int *dst_len)
> {
> - return comp->backend->compress(src, zstrm->buffer, dst_len,
> - zstrm->private);
> + *dst_len = PAGE_SIZE << 1;
> +
> + return crypto_ccomp_compress(comp->tfm, src, PAGE_SIZE,
> + zstrm->buffer, dst_len, zstrm->private);
> }
>
> int zcomp_decompress(struct zcomp *comp, struct zcomp_strm *zstrm,
> const unsigned char *src,
> - size_t src_len, unsigned char *dst)
> + unsigned int src_len, unsigned char *dst)
> {
> - return comp->backend->decompress(src, src_len, dst);
> + unsigned int size = PAGE_SIZE;
> + void *private = zstrm ? zstrm->private : NULL;
> +
> + return crypto_ccomp_decompress(comp->tfm, src, src_len,
> + dst, &size, private);
> }
>
> void zcomp_destroy(struct zcomp *comp)
> {
> comp->destroy(comp);
> + crypto_free_ccomp(comp->tfm);
> kfree(comp);
> }
>
> @@ -360,7 +373,7 @@ void zcomp_destroy(struct zcomp *comp)
> struct zcomp *zcomp_create(const char *compress, int max_strm)
> {
> struct zcomp *comp;
> - struct zcomp_backend *backend;
> + const char *backend;
> int error;
>
> backend = find_backend(compress);
> @@ -371,12 +384,18 @@ struct zcomp *zcomp_create(const char *compress, int max_strm)
> if (!comp)
> return ERR_PTR(-ENOMEM);
>
> - comp->backend = backend;
> + comp->tfm = crypto_alloc_ccomp(backend, 0, 0);
> + if (IS_ERR(comp->tfm)) {
> + kfree(comp);
> + return ERR_CAST(comp->tfm);
> + }
> +
> if (max_strm > 1)
> error = zcomp_strm_multi_create(comp, max_strm);
> else
> error = zcomp_strm_single_create(comp);
> if (error) {
> + crypto_free_ccomp(comp->tfm);
> kfree(comp);
hm... zcomp_destroy(comp) ?
> return ERR_PTR(error);
> }
> diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
> index 4c09c01..df9268d 100644
> --- a/drivers/block/zram/zcomp.h
> +++ b/drivers/block/zram/zcomp.h
> @@ -11,6 +11,7 @@
> #define _ZCOMP_H_
>
> #include <linux/mutex.h>
> +#include <crypto/compress.h>
>
> struct zcomp_strm {
> /* compression/decompression buffer */
> @@ -25,24 +26,10 @@ struct zcomp_strm {
> struct list_head list;
> };
>
> -/* static compression backend */
> -struct zcomp_backend {
> - int (*compress)(const unsigned char *src, unsigned char *dst,
> - size_t *dst_len, void *private);
> -
> - int (*decompress)(const unsigned char *src, size_t src_len,
> - unsigned char *dst);
> -
> - void *(*create)(void);
> - void (*destroy)(void *private);
> -
> - const char *name;
> -};
> -
> /* dynamic per-device compression frontend */
> struct zcomp {
> void *stream;
> - struct zcomp_backend *backend;
> + struct crypto_ccomp *tfm;
>
> struct zcomp_strm *(*strm_find)(struct zcomp *comp);
> void (*strm_release)(struct zcomp *comp, struct zcomp_strm *zstrm);
> @@ -61,14 +48,14 @@ struct zcomp_strm *zcomp_compress_begin(struct zcomp *comp);
> void zcomp_compress_end(struct zcomp *comp, struct zcomp_strm *zstrm);
>
> int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
> - const unsigned char *src, size_t *dst_len);
> + const unsigned char *src, unsigned int *dst_len);
>
> 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, struct zcomp_strm *zstrm,
> const unsigned char *src,
> - size_t src_len, unsigned char *dst);
> + unsigned int src_len, unsigned char *dst);
>
> bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
> #endif /* _ZCOMP_H_ */
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 85d5301..6f04fb2 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -567,7 +567,7 @@ static int zram_decompress_page(struct zram *zram, struct zcomp_strm *zstrm,
> unsigned char *cmem;
> struct zram_meta *meta = zram->meta;
> unsigned long handle;
> - size_t size;
> + unsigned int size;
>
> bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
> handle = meta->table[index].handle;
> @@ -656,7 +656,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
> int offset)
> {
> int ret = 0;
> - size_t clen;
> + unsigned int clen;
> unsigned long handle;
> struct page *page;
> unsigned char *user_mem, *cmem, *src, *uncmem = NULL;
> @@ -731,7 +731,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
>
> handle = zs_malloc(meta->mem_pool, clen);
> if (!handle) {
> - pr_err("Error allocating memory for compressed page: %u, size=%zu\n",
> + pr_err("Error allocating memory for compressed page: %u, size=%u\n",
> index, clen);
> ret = -ENOMEM;
> goto out;
> --
> 1.9.1
>
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