1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * Squashfs - a compressed read only filesyste 3 * Squashfs - a compressed read only filesystem for Linux
4 * 4 *
5 * Copyright (c) 2010 LG Electronics 5 * Copyright (c) 2010 LG Electronics
6 * Chan Jeong <chan.jeong@lge.com> 6 * Chan Jeong <chan.jeong@lge.com>
7 * 7 *
8 * lzo_wrapper.c 8 * lzo_wrapper.c
9 */ 9 */
10 10
11 #include <linux/mutex.h> 11 #include <linux/mutex.h>
12 #include <linux/bio.h> 12 #include <linux/bio.h>
13 #include <linux/slab.h> 13 #include <linux/slab.h>
14 #include <linux/vmalloc.h> 14 #include <linux/vmalloc.h>
15 #include <linux/lzo.h> 15 #include <linux/lzo.h>
16 16
17 #include "squashfs_fs.h" 17 #include "squashfs_fs.h"
18 #include "squashfs_fs_sb.h" 18 #include "squashfs_fs_sb.h"
19 #include "squashfs.h" 19 #include "squashfs.h"
20 #include "decompressor.h" 20 #include "decompressor.h"
21 #include "page_actor.h" 21 #include "page_actor.h"
22 22
23 struct squashfs_lzo { 23 struct squashfs_lzo {
24 void *input; 24 void *input;
25 void *output; 25 void *output;
26 }; 26 };
27 27
28 static void *lzo_init(struct squashfs_sb_info 28 static void *lzo_init(struct squashfs_sb_info *msblk, void *buff)
29 { 29 {
30 int block_size = max_t(int, msblk->blo 30 int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
31 31
32 struct squashfs_lzo *stream = kzalloc( 32 struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
33 if (stream == NULL) 33 if (stream == NULL)
34 goto failed; 34 goto failed;
35 stream->input = vmalloc(block_size); 35 stream->input = vmalloc(block_size);
36 if (stream->input == NULL) 36 if (stream->input == NULL)
37 goto failed; 37 goto failed;
38 stream->output = vmalloc(block_size); 38 stream->output = vmalloc(block_size);
39 if (stream->output == NULL) 39 if (stream->output == NULL)
40 goto failed2; 40 goto failed2;
41 41
42 return stream; 42 return stream;
43 43
44 failed2: 44 failed2:
45 vfree(stream->input); 45 vfree(stream->input);
46 failed: 46 failed:
47 ERROR("Failed to allocate lzo workspac 47 ERROR("Failed to allocate lzo workspace\n");
48 kfree(stream); 48 kfree(stream);
49 return ERR_PTR(-ENOMEM); 49 return ERR_PTR(-ENOMEM);
50 } 50 }
51 51
52 52
53 static void lzo_free(void *strm) 53 static void lzo_free(void *strm)
54 { 54 {
55 struct squashfs_lzo *stream = strm; 55 struct squashfs_lzo *stream = strm;
56 56
57 if (stream) { 57 if (stream) {
58 vfree(stream->input); 58 vfree(stream->input);
59 vfree(stream->output); 59 vfree(stream->output);
60 } 60 }
61 kfree(stream); 61 kfree(stream);
62 } 62 }
63 63
64 64
65 static int lzo_uncompress(struct squashfs_sb_i 65 static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
66 struct bio *bio, int offset, int lengt 66 struct bio *bio, int offset, int length,
67 struct squashfs_page_actor *output) 67 struct squashfs_page_actor *output)
68 { 68 {
69 struct bvec_iter_all iter_all = {}; 69 struct bvec_iter_all iter_all = {};
70 struct bio_vec *bvec = bvec_init_iter_ 70 struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
71 struct squashfs_lzo *stream = strm; 71 struct squashfs_lzo *stream = strm;
72 void *buff = stream->input, *data; 72 void *buff = stream->input, *data;
73 int bytes = length, res; 73 int bytes = length, res;
74 size_t out_len = output->length; 74 size_t out_len = output->length;
75 75
76 while (bio_next_segment(bio, &iter_all 76 while (bio_next_segment(bio, &iter_all)) {
77 int avail = min(bytes, ((int)b 77 int avail = min(bytes, ((int)bvec->bv_len) - offset);
78 78
79 data = bvec_virt(bvec); 79 data = bvec_virt(bvec);
80 memcpy(buff, data + offset, av 80 memcpy(buff, data + offset, avail);
81 buff += avail; 81 buff += avail;
82 bytes -= avail; 82 bytes -= avail;
83 offset = 0; 83 offset = 0;
84 } 84 }
85 85
86 res = lzo1x_decompress_safe(stream->in 86 res = lzo1x_decompress_safe(stream->input, (size_t)length,
87 stream 87 stream->output, &out_len);
88 if (res != LZO_E_OK) 88 if (res != LZO_E_OK)
89 goto failed; 89 goto failed;
90 90
91 res = bytes = (int)out_len; 91 res = bytes = (int)out_len;
92 data = squashfs_first_page(output); 92 data = squashfs_first_page(output);
93 buff = stream->output; 93 buff = stream->output;
94 while (data) { 94 while (data) {
95 if (bytes <= PAGE_SIZE) { 95 if (bytes <= PAGE_SIZE) {
96 if (!IS_ERR(data)) 96 if (!IS_ERR(data))
97 memcpy(data, b 97 memcpy(data, buff, bytes);
98 break; 98 break;
99 } else { 99 } else {
100 if (!IS_ERR(data)) 100 if (!IS_ERR(data))
101 memcpy(data, b 101 memcpy(data, buff, PAGE_SIZE);
102 buff += PAGE_SIZE; 102 buff += PAGE_SIZE;
103 bytes -= PAGE_SIZE; 103 bytes -= PAGE_SIZE;
104 data = squashfs_next_p 104 data = squashfs_next_page(output);
105 } 105 }
106 } 106 }
107 squashfs_finish_page(output); 107 squashfs_finish_page(output);
108 108
109 return res; 109 return res;
110 110
111 failed: 111 failed:
112 return -EIO; 112 return -EIO;
113 } 113 }
114 114
115 const struct squashfs_decompressor squashfs_lz 115 const struct squashfs_decompressor squashfs_lzo_comp_ops = {
116 .init = lzo_init, 116 .init = lzo_init,
117 .free = lzo_free, 117 .free = lzo_free,
118 .decompress = lzo_uncompress, 118 .decompress = lzo_uncompress,
119 .id = LZO_COMPRESSION, 119 .id = LZO_COMPRESSION,
120 .name = "lzo", 120 .name = "lzo",
121 .alloc_buffer = 0, 121 .alloc_buffer = 0,
122 .supported = 1 122 .supported = 1
123 }; 123 };
124 124
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