168252eb5SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
279cb8cedSChan Jeong /*
379cb8cedSChan Jeong * Squashfs - a compressed read only filesystem for Linux
479cb8cedSChan Jeong *
579cb8cedSChan Jeong * Copyright (c) 2010 LG Electronics
679cb8cedSChan Jeong * Chan Jeong <chan.jeong@lge.com>
779cb8cedSChan Jeong *
879cb8cedSChan Jeong * lzo_wrapper.c
979cb8cedSChan Jeong */
1079cb8cedSChan Jeong
1179cb8cedSChan Jeong #include <linux/mutex.h>
1293e72b3cSPhilippe Liard #include <linux/bio.h>
1379cb8cedSChan Jeong #include <linux/slab.h>
1479cb8cedSChan Jeong #include <linux/vmalloc.h>
1579cb8cedSChan Jeong #include <linux/lzo.h>
1679cb8cedSChan Jeong
1779cb8cedSChan Jeong #include "squashfs_fs.h"
1879cb8cedSChan Jeong #include "squashfs_fs_sb.h"
1979cb8cedSChan Jeong #include "squashfs.h"
2079cb8cedSChan Jeong #include "decompressor.h"
21846b730eSPhillip Lougher #include "page_actor.h"
2279cb8cedSChan Jeong
2379cb8cedSChan Jeong struct squashfs_lzo {
2479cb8cedSChan Jeong void *input;
2579cb8cedSChan Jeong void *output;
2679cb8cedSChan Jeong };
2779cb8cedSChan Jeong
lzo_init(struct squashfs_sb_info * msblk,void * buff)289508c6b9SPhillip Lougher static void *lzo_init(struct squashfs_sb_info *msblk, void *buff)
2979cb8cedSChan Jeong {
30f3065f60SPhillip Lougher int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
31f3065f60SPhillip Lougher
3279cb8cedSChan Jeong struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
3379cb8cedSChan Jeong if (stream == NULL)
3479cb8cedSChan Jeong goto failed;
35f3065f60SPhillip Lougher stream->input = vmalloc(block_size);
3679cb8cedSChan Jeong if (stream->input == NULL)
3779cb8cedSChan Jeong goto failed;
38f3065f60SPhillip Lougher stream->output = vmalloc(block_size);
3979cb8cedSChan Jeong if (stream->output == NULL)
4079cb8cedSChan Jeong goto failed2;
4179cb8cedSChan Jeong
4279cb8cedSChan Jeong return stream;
4379cb8cedSChan Jeong
4479cb8cedSChan Jeong failed2:
4579cb8cedSChan Jeong vfree(stream->input);
4679cb8cedSChan Jeong failed:
4779cb8cedSChan Jeong ERROR("Failed to allocate lzo workspace\n");
4879cb8cedSChan Jeong kfree(stream);
49b7fc0ff0SPhillip Lougher return ERR_PTR(-ENOMEM);
5079cb8cedSChan Jeong }
5179cb8cedSChan Jeong
5279cb8cedSChan Jeong
lzo_free(void * strm)5379cb8cedSChan Jeong static void lzo_free(void *strm)
5479cb8cedSChan Jeong {
5579cb8cedSChan Jeong struct squashfs_lzo *stream = strm;
5679cb8cedSChan Jeong
5779cb8cedSChan Jeong if (stream) {
5879cb8cedSChan Jeong vfree(stream->input);
5979cb8cedSChan Jeong vfree(stream->output);
6079cb8cedSChan Jeong }
6179cb8cedSChan Jeong kfree(stream);
6279cb8cedSChan Jeong }
6379cb8cedSChan Jeong
6479cb8cedSChan Jeong
lzo_uncompress(struct squashfs_sb_info * msblk,void * strm,struct bio * bio,int offset,int length,struct squashfs_page_actor * output)659508c6b9SPhillip Lougher static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
6693e72b3cSPhilippe Liard struct bio *bio, int offset, int length,
67846b730eSPhillip Lougher struct squashfs_page_actor *output)
6879cb8cedSChan Jeong {
6993e72b3cSPhilippe Liard struct bvec_iter_all iter_all = {};
7093e72b3cSPhilippe Liard struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
719508c6b9SPhillip Lougher struct squashfs_lzo *stream = strm;
72846b730eSPhillip Lougher void *buff = stream->input, *data;
7393e72b3cSPhilippe Liard int bytes = length, res;
74846b730eSPhillip Lougher size_t out_len = output->length;
7579cb8cedSChan Jeong
7693e72b3cSPhilippe Liard while (bio_next_segment(bio, &iter_all)) {
7793e72b3cSPhilippe Liard int avail = min(bytes, ((int)bvec->bv_len) - offset);
7893e72b3cSPhilippe Liard
79fbc27241SChristoph Hellwig data = bvec_virt(bvec);
8093e72b3cSPhilippe Liard memcpy(buff, data + offset, avail);
8179cb8cedSChan Jeong buff += avail;
8279cb8cedSChan Jeong bytes -= avail;
8379cb8cedSChan Jeong offset = 0;
8479cb8cedSChan Jeong }
8579cb8cedSChan Jeong
8679cb8cedSChan Jeong res = lzo1x_decompress_safe(stream->input, (size_t)length,
8779cb8cedSChan Jeong stream->output, &out_len);
8879cb8cedSChan Jeong if (res != LZO_E_OK)
8979cb8cedSChan Jeong goto failed;
9079cb8cedSChan Jeong
9179cb8cedSChan Jeong res = bytes = (int)out_len;
92846b730eSPhillip Lougher data = squashfs_first_page(output);
93846b730eSPhillip Lougher buff = stream->output;
94846b730eSPhillip Lougher while (data) {
9509cbfeafSKirill A. Shutemov if (bytes <= PAGE_SIZE) {
96*f268eeddSPhillip Lougher if (!IS_ERR(data))
97846b730eSPhillip Lougher memcpy(data, buff, bytes);
98846b730eSPhillip Lougher break;
99846b730eSPhillip Lougher } else {
100*f268eeddSPhillip Lougher if (!IS_ERR(data))
10109cbfeafSKirill A. Shutemov memcpy(data, buff, PAGE_SIZE);
10209cbfeafSKirill A. Shutemov buff += PAGE_SIZE;
10309cbfeafSKirill A. Shutemov bytes -= PAGE_SIZE;
104846b730eSPhillip Lougher data = squashfs_next_page(output);
10579cb8cedSChan Jeong }
106846b730eSPhillip Lougher }
107846b730eSPhillip Lougher squashfs_finish_page(output);
10879cb8cedSChan Jeong
10979cb8cedSChan Jeong return res;
11079cb8cedSChan Jeong
11179cb8cedSChan Jeong failed:
11279cb8cedSChan Jeong return -EIO;
11379cb8cedSChan Jeong }
11479cb8cedSChan Jeong
11579cb8cedSChan Jeong const struct squashfs_decompressor squashfs_lzo_comp_ops = {
11679cb8cedSChan Jeong .init = lzo_init,
11779cb8cedSChan Jeong .free = lzo_free,
11879cb8cedSChan Jeong .decompress = lzo_uncompress,
11979cb8cedSChan Jeong .id = LZO_COMPRESSION,
12079cb8cedSChan Jeong .name = "lzo",
121*f268eeddSPhillip Lougher .alloc_buffer = 0,
12279cb8cedSChan Jeong .supported = 1
12379cb8cedSChan Jeong };
124