mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 08:07:10 +07:00
e02d238c98
Do not __GFP_ZERO allocated zcomp ->private pages. We keep allocated streams around and use them for read/write requests, so we supply a zeroed out ->private to compression algorithm as a scratch buffer only once -- the first time we use that stream. For the rest of IO requests served by this stream ->private usually contains some temporarily data from the previous requests. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2014 Sergey Senozhatsky.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/lzo.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include "zcomp_lzo.h"
|
|
|
|
static void *lzo_create(gfp_t flags)
|
|
{
|
|
void *ret;
|
|
|
|
ret = kmalloc(LZO1X_MEM_COMPRESS, flags);
|
|
if (!ret)
|
|
ret = __vmalloc(LZO1X_MEM_COMPRESS,
|
|
flags | __GFP_HIGHMEM,
|
|
PAGE_KERNEL);
|
|
return ret;
|
|
}
|
|
|
|
static void lzo_destroy(void *private)
|
|
{
|
|
kvfree(private);
|
|
}
|
|
|
|
static int lzo_compress(const unsigned char *src, unsigned char *dst,
|
|
size_t *dst_len, void *private)
|
|
{
|
|
int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private);
|
|
return ret == LZO_E_OK ? 0 : ret;
|
|
}
|
|
|
|
static int lzo_decompress(const unsigned char *src, size_t src_len,
|
|
unsigned char *dst)
|
|
{
|
|
size_t dst_len = PAGE_SIZE;
|
|
int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
|
|
return ret == LZO_E_OK ? 0 : ret;
|
|
}
|
|
|
|
struct zcomp_backend zcomp_lzo = {
|
|
.compress = lzo_compress,
|
|
.decompress = lzo_decompress,
|
|
.create = lzo_create,
|
|
.destroy = lzo_destroy,
|
|
.name = "lzo",
|
|
};
|