1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Squashfs - a compressed read only filesystem for Linux
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2010 LG Electronics
6*4882a593Smuzhiyun * Chan Jeong <chan.jeong@lge.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * lzo_wrapper.c
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/mutex.h>
12*4882a593Smuzhiyun #include <linux/bio.h>
13*4882a593Smuzhiyun #include <linux/slab.h>
14*4882a593Smuzhiyun #include <linux/vmalloc.h>
15*4882a593Smuzhiyun #include <linux/lzo.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include "squashfs_fs.h"
18*4882a593Smuzhiyun #include "squashfs_fs_sb.h"
19*4882a593Smuzhiyun #include "squashfs.h"
20*4882a593Smuzhiyun #include "decompressor.h"
21*4882a593Smuzhiyun #include "page_actor.h"
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun struct squashfs_lzo {
24*4882a593Smuzhiyun void *input;
25*4882a593Smuzhiyun void *output;
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
lzo_init(struct squashfs_sb_info * msblk,void * buff)28*4882a593Smuzhiyun static void *lzo_init(struct squashfs_sb_info *msblk, void *buff)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
33*4882a593Smuzhiyun if (stream == NULL)
34*4882a593Smuzhiyun goto failed;
35*4882a593Smuzhiyun stream->input = vmalloc(block_size);
36*4882a593Smuzhiyun if (stream->input == NULL)
37*4882a593Smuzhiyun goto failed;
38*4882a593Smuzhiyun stream->output = vmalloc(block_size);
39*4882a593Smuzhiyun if (stream->output == NULL)
40*4882a593Smuzhiyun goto failed2;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return stream;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun failed2:
45*4882a593Smuzhiyun vfree(stream->input);
46*4882a593Smuzhiyun failed:
47*4882a593Smuzhiyun ERROR("Failed to allocate lzo workspace\n");
48*4882a593Smuzhiyun kfree(stream);
49*4882a593Smuzhiyun return ERR_PTR(-ENOMEM);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun
lzo_free(void * strm)53*4882a593Smuzhiyun static void lzo_free(void *strm)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun struct squashfs_lzo *stream = strm;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun if (stream) {
58*4882a593Smuzhiyun vfree(stream->input);
59*4882a593Smuzhiyun vfree(stream->output);
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun kfree(stream);
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun
lzo_uncompress(struct squashfs_sb_info * msblk,void * strm,struct bio * bio,int offset,int length,struct squashfs_page_actor * output)65*4882a593Smuzhiyun static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
66*4882a593Smuzhiyun struct bio *bio, int offset, int length,
67*4882a593Smuzhiyun struct squashfs_page_actor *output)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun struct bvec_iter_all iter_all = {};
70*4882a593Smuzhiyun struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
71*4882a593Smuzhiyun struct squashfs_lzo *stream = strm;
72*4882a593Smuzhiyun void *buff = stream->input, *data;
73*4882a593Smuzhiyun int bytes = length, res;
74*4882a593Smuzhiyun size_t out_len = output->length;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun while (bio_next_segment(bio, &iter_all)) {
77*4882a593Smuzhiyun int avail = min(bytes, ((int)bvec->bv_len) - offset);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun data = page_address(bvec->bv_page) + bvec->bv_offset;
80*4882a593Smuzhiyun memcpy(buff, data + offset, avail);
81*4882a593Smuzhiyun buff += avail;
82*4882a593Smuzhiyun bytes -= avail;
83*4882a593Smuzhiyun offset = 0;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun res = lzo1x_decompress_safe(stream->input, (size_t)length,
87*4882a593Smuzhiyun stream->output, &out_len);
88*4882a593Smuzhiyun if (res != LZO_E_OK)
89*4882a593Smuzhiyun goto failed;
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun res = bytes = (int)out_len;
92*4882a593Smuzhiyun data = squashfs_first_page(output);
93*4882a593Smuzhiyun buff = stream->output;
94*4882a593Smuzhiyun while (data) {
95*4882a593Smuzhiyun if (bytes <= PAGE_SIZE) {
96*4882a593Smuzhiyun memcpy(data, buff, bytes);
97*4882a593Smuzhiyun break;
98*4882a593Smuzhiyun } else {
99*4882a593Smuzhiyun memcpy(data, buff, PAGE_SIZE);
100*4882a593Smuzhiyun buff += PAGE_SIZE;
101*4882a593Smuzhiyun bytes -= PAGE_SIZE;
102*4882a593Smuzhiyun data = squashfs_next_page(output);
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun squashfs_finish_page(output);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun return res;
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun failed:
110*4882a593Smuzhiyun return -EIO;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun const struct squashfs_decompressor squashfs_lzo_comp_ops = {
114*4882a593Smuzhiyun .init = lzo_init,
115*4882a593Smuzhiyun .free = lzo_free,
116*4882a593Smuzhiyun .decompress = lzo_uncompress,
117*4882a593Smuzhiyun .id = LZO_COMPRESSION,
118*4882a593Smuzhiyun .name = "lzo",
119*4882a593Smuzhiyun .supported = 1
120*4882a593Smuzhiyun };
121