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75d8947a36
Each zcomp backend uses own gfp flag but it's pointless because the context they could be called is driven by upper layer(ie, zcomp frontend). As well, zcomp frondend could call them in different context. One context(ie, zram init part) is it should be better to make sure successful allocation other context(ie, further stream allocation part for accelarating I/O speed) is just optional so let's pass gfp down from driver (ie, zcomp frontend) like normal MM convention. [sergey.senozhatsky@gmail.com: add missing __vmalloc zero and highmem gfps] Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> 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
/*
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* Copyright (C) 2014 Sergey Senozhatsky.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/lzo.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include "zcomp_lzo.h"
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static void *lzo_create(gfp_t flags)
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{
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void *ret;
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ret = kzalloc(LZO1X_MEM_COMPRESS, flags);
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if (!ret)
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ret = __vmalloc(LZO1X_MEM_COMPRESS,
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flags | __GFP_ZERO | __GFP_HIGHMEM,
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PAGE_KERNEL);
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return ret;
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}
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static void lzo_destroy(void *private)
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{
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kvfree(private);
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}
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static int lzo_compress(const unsigned char *src, unsigned char *dst,
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size_t *dst_len, void *private)
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{
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int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private);
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return ret == LZO_E_OK ? 0 : ret;
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}
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static int lzo_decompress(const unsigned char *src, size_t src_len,
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unsigned char *dst)
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{
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size_t dst_len = PAGE_SIZE;
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int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
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return ret == LZO_E_OK ? 0 : ret;
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}
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struct zcomp_backend zcomp_lzo = {
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.compress = lzo_compress,
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.decompress = lzo_decompress,
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.create = lzo_create,
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.destroy = lzo_destroy,
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.name = "lzo",
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};
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