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6ada7453
TS
1/*
2 * Block driver for Parallels disk image format
3 *
4 * Copyright (c) 2007 Alex Beregszaszi
5 *
6 * This code is based on comparing different disk images created by Parallels.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
faf07963 26#include "qemu-common.h"
737e150e 27#include "block/block_int.h"
1de7afc9 28#include "qemu/module.h"
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29
30/**************************************************************/
31
32#define HEADER_MAGIC "WithoutFreeSpace"
33#define HEADER_VERSION 2
34#define HEADER_SIZE 64
35
36// always little-endian
37struct parallels_header {
38 char magic[16]; // "WithoutFreeSpace"
39 uint32_t version;
40 uint32_t heads;
41 uint32_t cylinders;
42 uint32_t tracks;
43 uint32_t catalog_entries;
44 uint32_t nb_sectors;
45 char padding[24];
541dc0d4 46} QEMU_PACKED;
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47
48typedef struct BDRVParallelsState {
848c66e8 49 CoMutex lock;
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50
51 uint32_t *catalog_bitmap;
afbcc40b 52 unsigned int catalog_size;
6ada7453 53
9302e863 54 unsigned int tracks;
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55} BDRVParallelsState;
56
57static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
58{
59 const struct parallels_header *ph = (const void *)buf;
60
61 if (buf_size < HEADER_SIZE)
62 return 0;
63
64 if (!memcmp(ph->magic, HEADER_MAGIC, 16) &&
65 (le32_to_cpu(ph->version) == HEADER_VERSION))
66 return 100;
67
68 return 0;
69}
70
015a1036
HR
71static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
72 Error **errp)
6ada7453
TS
73{
74 BDRVParallelsState *s = bs->opaque;
1dec5a70 75 int i;
6ada7453 76 struct parallels_header ph;
46536235 77 int ret;
6ada7453 78
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79 bs->read_only = 1; // no write support yet
80
46536235
KW
81 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
82 if (ret < 0) {
6ada7453 83 goto fail;
46536235 84 }
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85
86 if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
46536235 87 (le32_to_cpu(ph.version) != HEADER_VERSION)) {
76abe407
PB
88 error_setg(errp, "Image not in Parallels format");
89 ret = -EINVAL;
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TS
90 goto fail;
91 }
92
93 bs->total_sectors = le32_to_cpu(ph.nb_sectors);
94
6ada7453 95 s->tracks = le32_to_cpu(ph.tracks);
9302e863
KW
96 if (s->tracks == 0) {
97 error_setg(errp, "Invalid image: Zero sectors per track");
98 ret = -EINVAL;
99 goto fail;
100 }
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101
102 s->catalog_size = le32_to_cpu(ph.catalog_entries);
afbcc40b
KW
103 if (s->catalog_size > INT_MAX / 4) {
104 error_setg(errp, "Catalog too large");
105 ret = -EFBIG;
106 goto fail;
107 }
7267c094 108 s->catalog_bitmap = g_malloc(s->catalog_size * 4);
46536235
KW
109
110 ret = bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4);
111 if (ret < 0) {
112 goto fail;
113 }
114
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115 for (i = 0; i < s->catalog_size; i++)
116 le32_to_cpus(&s->catalog_bitmap[i]);
117
848c66e8 118 qemu_co_mutex_init(&s->lock);
6ada7453 119 return 0;
46536235 120
6ada7453 121fail:
46536235
KW
122 g_free(s->catalog_bitmap);
123 return ret;
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124}
125
9d8b88f6 126static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
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127{
128 BDRVParallelsState *s = bs->opaque;
c34d2451 129 uint32_t index, offset;
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130
131 index = sector_num / s->tracks;
132 offset = sector_num % s->tracks;
133
9d8b88f6 134 /* not allocated */
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135 if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
136 return -1;
9d8b88f6 137 return (uint64_t)(s->catalog_bitmap[index] + offset) * 512;
6ada7453
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138}
139
140static int parallels_read(BlockDriverState *bs, int64_t sector_num,
141 uint8_t *buf, int nb_sectors)
142{
6ada7453 143 while (nb_sectors > 0) {
9d8b88f6
CH
144 int64_t position = seek_to_sector(bs, sector_num);
145 if (position >= 0) {
1dec5a70 146 if (bdrv_pread(bs->file, position, buf, 512) != 512)
9d8b88f6
CH
147 return -1;
148 } else {
6ada7453 149 memset(buf, 0, 512);
9d8b88f6 150 }
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151 nb_sectors--;
152 sector_num++;
153 buf += 512;
154 }
155 return 0;
156}
157
2914caa0
PB
158static coroutine_fn int parallels_co_read(BlockDriverState *bs, int64_t sector_num,
159 uint8_t *buf, int nb_sectors)
160{
161 int ret;
162 BDRVParallelsState *s = bs->opaque;
163 qemu_co_mutex_lock(&s->lock);
164 ret = parallels_read(bs, sector_num, buf, nb_sectors);
165 qemu_co_mutex_unlock(&s->lock);
166 return ret;
167}
168
6ada7453
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169static void parallels_close(BlockDriverState *bs)
170{
171 BDRVParallelsState *s = bs->opaque;
7267c094 172 g_free(s->catalog_bitmap);
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173}
174
5efa9d5a 175static BlockDriver bdrv_parallels = {
e60f469c
AJ
176 .format_name = "parallels",
177 .instance_size = sizeof(BDRVParallelsState),
178 .bdrv_probe = parallels_probe,
1dec5a70 179 .bdrv_open = parallels_open,
2914caa0 180 .bdrv_read = parallels_co_read,
e60f469c 181 .bdrv_close = parallels_close,
6ada7453 182};
5efa9d5a
AL
183
184static void bdrv_parallels_init(void)
185{
186 bdrv_register(&bdrv_parallels);
187}
188
189block_init(bdrv_parallels_init);