1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Squashfs - a compressed read only filesyste 2 * Squashfs - a compressed read only filesystem for Linux
4 * 3 *
5 * Copyright (c) 2010 LG Electronics 4 * Copyright (c) 2010 LG Electronics
6 * Chan Jeong <chan.jeong@lge.com> 5 * Chan Jeong <chan.jeong@lge.com>
7 * 6 *
>> 7 * This program is free software; you can redistribute it and/or
>> 8 * modify it under the terms of the GNU General Public License
>> 9 * as published by the Free Software Foundation; either version 2,
>> 10 * or (at your option) any later version.
>> 11 *
>> 12 * This program is distributed in the hope that it will be useful,
>> 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> 15 * GNU General Public License for more details.
>> 16 *
>> 17 * You should have received a copy of the GNU General Public License
>> 18 * along with this program; if not, write to the Free Software
>> 19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
>> 20 *
8 * lzo_wrapper.c 21 * lzo_wrapper.c
9 */ 22 */
10 23
11 #include <linux/mutex.h> 24 #include <linux/mutex.h>
12 #include <linux/bio.h> !! 25 #include <linux/buffer_head.h>
13 #include <linux/slab.h> 26 #include <linux/slab.h>
14 #include <linux/vmalloc.h> 27 #include <linux/vmalloc.h>
15 #include <linux/lzo.h> 28 #include <linux/lzo.h>
16 29
17 #include "squashfs_fs.h" 30 #include "squashfs_fs.h"
18 #include "squashfs_fs_sb.h" 31 #include "squashfs_fs_sb.h"
19 #include "squashfs.h" 32 #include "squashfs.h"
20 #include "decompressor.h" 33 #include "decompressor.h"
21 #include "page_actor.h" 34 #include "page_actor.h"
22 35
23 struct squashfs_lzo { 36 struct squashfs_lzo {
24 void *input; 37 void *input;
25 void *output; 38 void *output;
26 }; 39 };
27 40
28 static void *lzo_init(struct squashfs_sb_info 41 static void *lzo_init(struct squashfs_sb_info *msblk, void *buff)
29 { 42 {
30 int block_size = max_t(int, msblk->blo 43 int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
31 44
32 struct squashfs_lzo *stream = kzalloc( 45 struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
33 if (stream == NULL) 46 if (stream == NULL)
34 goto failed; 47 goto failed;
35 stream->input = vmalloc(block_size); 48 stream->input = vmalloc(block_size);
36 if (stream->input == NULL) 49 if (stream->input == NULL)
37 goto failed; 50 goto failed;
38 stream->output = vmalloc(block_size); 51 stream->output = vmalloc(block_size);
39 if (stream->output == NULL) 52 if (stream->output == NULL)
40 goto failed2; 53 goto failed2;
41 54
42 return stream; 55 return stream;
43 56
44 failed2: 57 failed2:
45 vfree(stream->input); 58 vfree(stream->input);
46 failed: 59 failed:
47 ERROR("Failed to allocate lzo workspac 60 ERROR("Failed to allocate lzo workspace\n");
48 kfree(stream); 61 kfree(stream);
49 return ERR_PTR(-ENOMEM); 62 return ERR_PTR(-ENOMEM);
50 } 63 }
51 64
52 65
53 static void lzo_free(void *strm) 66 static void lzo_free(void *strm)
54 { 67 {
55 struct squashfs_lzo *stream = strm; 68 struct squashfs_lzo *stream = strm;
56 69
57 if (stream) { 70 if (stream) {
58 vfree(stream->input); 71 vfree(stream->input);
59 vfree(stream->output); 72 vfree(stream->output);
60 } 73 }
61 kfree(stream); 74 kfree(stream);
62 } 75 }
63 76
64 77
65 static int lzo_uncompress(struct squashfs_sb_i 78 static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
66 struct bio *bio, int offset, int lengt !! 79 struct buffer_head **bh, int b, int offset, int length,
67 struct squashfs_page_actor *output) 80 struct squashfs_page_actor *output)
68 { 81 {
69 struct bvec_iter_all iter_all = {}; <<
70 struct bio_vec *bvec = bvec_init_iter_ <<
71 struct squashfs_lzo *stream = strm; 82 struct squashfs_lzo *stream = strm;
72 void *buff = stream->input, *data; 83 void *buff = stream->input, *data;
73 int bytes = length, res; !! 84 int avail, i, bytes = length, res;
74 size_t out_len = output->length; 85 size_t out_len = output->length;
75 86
76 while (bio_next_segment(bio, &iter_all !! 87 for (i = 0; i < b; i++) {
77 int avail = min(bytes, ((int)b !! 88 avail = min(bytes, msblk->devblksize - offset);
78 !! 89 memcpy(buff, bh[i]->b_data + offset, avail);
79 data = bvec_virt(bvec); <<
80 memcpy(buff, data + offset, av <<
81 buff += avail; 90 buff += avail;
82 bytes -= avail; 91 bytes -= avail;
83 offset = 0; 92 offset = 0;
>> 93 put_bh(bh[i]);
84 } 94 }
85 95
86 res = lzo1x_decompress_safe(stream->in 96 res = lzo1x_decompress_safe(stream->input, (size_t)length,
87 stream 97 stream->output, &out_len);
88 if (res != LZO_E_OK) 98 if (res != LZO_E_OK)
89 goto failed; 99 goto failed;
90 100
91 res = bytes = (int)out_len; 101 res = bytes = (int)out_len;
92 data = squashfs_first_page(output); 102 data = squashfs_first_page(output);
93 buff = stream->output; 103 buff = stream->output;
94 while (data) { 104 while (data) {
95 if (bytes <= PAGE_SIZE) { !! 105 if (bytes <= PAGE_CACHE_SIZE) {
96 if (!IS_ERR(data)) !! 106 memcpy(data, buff, bytes);
97 memcpy(data, b <<
98 break; 107 break;
99 } else { 108 } else {
100 if (!IS_ERR(data)) !! 109 memcpy(data, buff, PAGE_CACHE_SIZE);
101 memcpy(data, b !! 110 buff += PAGE_CACHE_SIZE;
102 buff += PAGE_SIZE; !! 111 bytes -= PAGE_CACHE_SIZE;
103 bytes -= PAGE_SIZE; <<
104 data = squashfs_next_p 112 data = squashfs_next_page(output);
105 } 113 }
106 } 114 }
107 squashfs_finish_page(output); 115 squashfs_finish_page(output);
108 116
109 return res; 117 return res;
110 118
111 failed: 119 failed:
112 return -EIO; 120 return -EIO;
113 } 121 }
114 122
115 const struct squashfs_decompressor squashfs_lz 123 const struct squashfs_decompressor squashfs_lzo_comp_ops = {
116 .init = lzo_init, 124 .init = lzo_init,
117 .free = lzo_free, 125 .free = lzo_free,
118 .decompress = lzo_uncompress, 126 .decompress = lzo_uncompress,
119 .id = LZO_COMPRESSION, 127 .id = LZO_COMPRESSION,
120 .name = "lzo", 128 .name = "lzo",
121 .alloc_buffer = 0, <<
122 .supported = 1 129 .supported = 1
123 }; 130 };
124 131
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