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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
2.5 KiB
C
128 lines
2.5 KiB
C
#include <linux/kernel.h>
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#include <linux/lz4.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "backend_lz4.h"
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struct lz4_ctx {
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void *mem;
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LZ4_streamDecode_t *dstrm;
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LZ4_stream_t *cstrm;
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};
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static void lz4_release_params(struct zcomp_params *params)
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{
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}
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static int lz4_setup_params(struct zcomp_params *params)
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{
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if (params->level == ZCOMP_PARAM_NOT_SET)
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params->level = LZ4_ACCELERATION_DEFAULT;
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return 0;
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}
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static void lz4_destroy(struct zcomp_ctx *ctx)
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{
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struct lz4_ctx *zctx = ctx->context;
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if (!zctx)
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return;
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vfree(zctx->mem);
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kfree(zctx->dstrm);
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kfree(zctx->cstrm);
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kfree(zctx);
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}
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static int lz4_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
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{
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struct lz4_ctx *zctx;
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zctx = kzalloc_obj(*zctx);
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if (!zctx)
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return -ENOMEM;
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ctx->context = zctx;
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if (params->dict_sz == 0) {
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zctx->mem = vmalloc(LZ4_MEM_COMPRESS);
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if (!zctx->mem)
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goto error;
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} else {
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zctx->dstrm = kzalloc_obj(*zctx->dstrm);
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if (!zctx->dstrm)
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goto error;
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zctx->cstrm = kzalloc_obj(*zctx->cstrm);
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if (!zctx->cstrm)
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goto error;
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}
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return 0;
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error:
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lz4_destroy(ctx);
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return -ENOMEM;
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}
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static int lz4_compress(struct zcomp_params *params, struct zcomp_ctx *ctx,
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struct zcomp_req *req)
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{
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struct lz4_ctx *zctx = ctx->context;
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int ret;
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if (!zctx->cstrm) {
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ret = LZ4_compress_fast(req->src, req->dst, req->src_len,
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req->dst_len, params->level,
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zctx->mem);
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} else {
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/* Cstrm needs to be reset */
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ret = LZ4_loadDict(zctx->cstrm, params->dict, params->dict_sz);
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if (ret != params->dict_sz)
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return -EINVAL;
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ret = LZ4_compress_fast_continue(zctx->cstrm, req->src,
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req->dst, req->src_len,
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req->dst_len, params->level);
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}
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if (!ret)
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return -EINVAL;
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req->dst_len = ret;
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return 0;
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}
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static int lz4_decompress(struct zcomp_params *params, struct zcomp_ctx *ctx,
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struct zcomp_req *req)
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{
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struct lz4_ctx *zctx = ctx->context;
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int ret;
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if (!zctx->dstrm) {
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ret = LZ4_decompress_safe(req->src, req->dst, req->src_len,
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req->dst_len);
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} else {
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/* Dstrm needs to be reset */
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ret = LZ4_setStreamDecode(zctx->dstrm, params->dict,
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params->dict_sz);
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if (!ret)
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return -EINVAL;
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ret = LZ4_decompress_safe_continue(zctx->dstrm, req->src,
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req->dst, req->src_len,
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req->dst_len);
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}
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if (ret < 0)
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return -EINVAL;
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return 0;
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}
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const struct zcomp_ops backend_lz4 = {
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.compress = lz4_compress,
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.decompress = lz4_decompress,
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.create_ctx = lz4_create,
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.destroy_ctx = lz4_destroy,
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.setup_params = lz4_setup_params,
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.release_params = lz4_release_params,
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.name = "lz4",
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};
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