846b730e99
Further generalise the decompressors by adding a page handler abstraction. This adds helpers to allow the decompressors to access and process the output buffers in an implementation independant manner. This allows different types of output buffer to be passed to the decompressors, with the implementation specific aspects handled at decompression time, but without the knowledge being held in the decompressor wrapper code. This will allow the decompressors to handle Squashfs cache buffers, and page cache pages. This patch adds the abstraction and an implementation for the caches. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
130 lines
3 KiB
C
130 lines
3 KiB
C
/*
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* Squashfs - a compressed read only filesystem for Linux
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*
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* Copyright (c) 2010 LG Electronics
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* Chan Jeong <chan.jeong@lge.com>
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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 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* lzo_wrapper.c
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*/
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#include <linux/mutex.h>
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#include <linux/buffer_head.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/lzo.h>
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#include "squashfs_fs.h"
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#include "squashfs_fs_sb.h"
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#include "squashfs.h"
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#include "decompressor.h"
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#include "page_actor.h"
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struct squashfs_lzo {
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void *input;
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void *output;
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};
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static void *lzo_init(struct squashfs_sb_info *msblk, void *buff)
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{
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int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
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struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
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if (stream == NULL)
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goto failed;
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stream->input = vmalloc(block_size);
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if (stream->input == NULL)
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goto failed;
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stream->output = vmalloc(block_size);
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if (stream->output == NULL)
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goto failed2;
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return stream;
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failed2:
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vfree(stream->input);
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failed:
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ERROR("Failed to allocate lzo workspace\n");
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kfree(stream);
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return ERR_PTR(-ENOMEM);
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}
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static void lzo_free(void *strm)
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{
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struct squashfs_lzo *stream = strm;
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if (stream) {
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vfree(stream->input);
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vfree(stream->output);
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}
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kfree(stream);
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}
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static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
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struct buffer_head **bh, int b, int offset, int length,
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struct squashfs_page_actor *output)
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{
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struct squashfs_lzo *stream = strm;
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void *buff = stream->input, *data;
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int avail, i, bytes = length, res;
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size_t out_len = output->length;
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for (i = 0; i < b; i++) {
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avail = min(bytes, msblk->devblksize - offset);
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memcpy(buff, bh[i]->b_data + offset, avail);
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buff += avail;
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bytes -= avail;
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offset = 0;
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put_bh(bh[i]);
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}
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res = lzo1x_decompress_safe(stream->input, (size_t)length,
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stream->output, &out_len);
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if (res != LZO_E_OK)
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goto failed;
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res = bytes = (int)out_len;
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data = squashfs_first_page(output);
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buff = stream->output;
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while (data) {
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if (bytes <= PAGE_CACHE_SIZE) {
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memcpy(data, buff, bytes);
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break;
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} else {
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memcpy(data, buff, PAGE_CACHE_SIZE);
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buff += PAGE_CACHE_SIZE;
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bytes -= PAGE_CACHE_SIZE;
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data = squashfs_next_page(output);
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}
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}
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squashfs_finish_page(output);
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return res;
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failed:
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return -EIO;
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}
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const struct squashfs_decompressor squashfs_lzo_comp_ops = {
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.init = lzo_init,
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.free = lzo_free,
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.decompress = lzo_uncompress,
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.id = LZO_COMPRESSION,
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.name = "lzo",
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.supported = 1
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};
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