drivers/block/zram/backend_lzo.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/kernel.h>
   4 #include <linux/slab.h>
   5 #include <linux/lzo.h>
   6
   7 #include "backend_lzo.h"
   8
   9 static void lzo_release_params(struct zcomp_params *params)
  10 {
  11 }
  12
  13 static int lzo_setup_params(struct zcomp_params *params)
  14 {
  15         return 0;
  16 }
  17
  18 static int lzo_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
  19 {
  20         ctx->context = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
  21         if (!ctx->context)
  22                 return -ENOMEM;
  23         return 0;
  24 }
  25
  26 static void lzo_destroy(struct zcomp_ctx *ctx)
  27 {
  28         kfree(ctx->context);
  29 }
  30
  31 static int lzo_compress(struct zcomp_params *params, struct zcomp_ctx *ctx,
  32                         struct zcomp_req *req)
  33 {
  34         int ret;
  35
  36         ret = lzo1x_1_compress(req->src, req->src_len, req->dst,
  37                                &req->dst_len, ctx->context);
  38         return ret == LZO_E_OK ? 0 : ret;
  39 }
  40
  41 static int lzo_decompress(struct zcomp_params *params, struct zcomp_ctx *ctx,
  42                           struct zcomp_req *req)
  43 {
  44         int ret;
  45
  46         ret = lzo1x_decompress_safe(req->src, req->src_len,
  47                                     req->dst, &req->dst_len);
  48         return ret == LZO_E_OK ? 0 : ret;
  49 }
  50
  51 const struct zcomp_ops backend_lzo = {
  52         .compress       = lzo_compress,
  53         .decompress     = lzo_decompress,
  54         .create_ctx     = lzo_create,
  55         .destroy_ctx    = lzo_destroy,
  56         .setup_params   = lzo_setup_params,
  57         .release_params = lzo_release_params,
  58         .name           = "lzo",
  59 };