blob: 1a5bd350b3c53f54ebc4654efd5b754db62a5577 [file] [log] [blame]
ths6ada7452007-07-31 23:28:53 +00001/*
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 */
pbrookfaf07962007-11-11 02:51:17 +000026#include "qemu-common.h"
Paolo Bonzini737e1502012-12-17 18:19:44 +010027#include "block/block_int.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010028#include "qemu/module.h"
ths6ada7452007-07-31 23:28:53 +000029
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];
Stefan Weil541dc0d2011-08-31 12:38:01 +020046} QEMU_PACKED;
ths6ada7452007-07-31 23:28:53 +000047
48typedef struct BDRVParallelsState {
Paolo Bonzini848c66e2011-10-20 13:16:21 +020049 CoMutex lock;
ths6ada7452007-07-31 23:28:53 +000050
51 uint32_t *catalog_bitmap;
Kevin Wolfafbcc402014-03-26 13:06:08 +010052 unsigned int catalog_size;
ths6ada7452007-07-31 23:28:53 +000053
Kevin Wolf9302e862014-03-26 13:06:09 +010054 unsigned int tracks;
ths6ada7452007-07-31 23:28:53 +000055} 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
Max Reitz015a1032013-09-05 14:22:29 +020071static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
72 Error **errp)
ths6ada7452007-07-31 23:28:53 +000073{
74 BDRVParallelsState *s = bs->opaque;
Christoph Hellwig1dec5a72010-05-06 22:04:50 +020075 int i;
ths6ada7452007-07-31 23:28:53 +000076 struct parallels_header ph;
Kevin Wolf46536232013-01-25 17:07:32 +010077 int ret;
ths6ada7452007-07-31 23:28:53 +000078
ths6ada7452007-07-31 23:28:53 +000079 bs->read_only = 1; // no write support yet
80
Kevin Wolf46536232013-01-25 17:07:32 +010081 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
82 if (ret < 0) {
ths6ada7452007-07-31 23:28:53 +000083 goto fail;
Kevin Wolf46536232013-01-25 17:07:32 +010084 }
ths6ada7452007-07-31 23:28:53 +000085
86 if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
Kevin Wolf46536232013-01-25 17:07:32 +010087 (le32_to_cpu(ph.version) != HEADER_VERSION)) {
Paolo Bonzini76abe402014-02-17 14:44:06 +010088 error_setg(errp, "Image not in Parallels format");
89 ret = -EINVAL;
ths6ada7452007-07-31 23:28:53 +000090 goto fail;
91 }
92
93 bs->total_sectors = le32_to_cpu(ph.nb_sectors);
94
ths6ada7452007-07-31 23:28:53 +000095 s->tracks = le32_to_cpu(ph.tracks);
Kevin Wolf9302e862014-03-26 13:06:09 +010096 if (s->tracks == 0) {
97 error_setg(errp, "Invalid image: Zero sectors per track");
98 ret = -EINVAL;
99 goto fail;
100 }
ths6ada7452007-07-31 23:28:53 +0000101
102 s->catalog_size = le32_to_cpu(ph.catalog_entries);
Kevin Wolfafbcc402014-03-26 13:06:08 +0100103 if (s->catalog_size > INT_MAX / 4) {
104 error_setg(errp, "Catalog too large");
105 ret = -EFBIG;
106 goto fail;
107 }
Anthony Liguori7267c092011-08-20 22:09:37 -0500108 s->catalog_bitmap = g_malloc(s->catalog_size * 4);
Kevin Wolf46536232013-01-25 17:07:32 +0100109
110 ret = bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4);
111 if (ret < 0) {
112 goto fail;
113 }
114
ths6ada7452007-07-31 23:28:53 +0000115 for (i = 0; i < s->catalog_size; i++)
116 le32_to_cpus(&s->catalog_bitmap[i]);
117
Paolo Bonzini848c66e2011-10-20 13:16:21 +0200118 qemu_co_mutex_init(&s->lock);
ths6ada7452007-07-31 23:28:53 +0000119 return 0;
Kevin Wolf46536232013-01-25 17:07:32 +0100120
ths6ada7452007-07-31 23:28:53 +0000121fail:
Kevin Wolf46536232013-01-25 17:07:32 +0100122 g_free(s->catalog_bitmap);
123 return ret;
ths6ada7452007-07-31 23:28:53 +0000124}
125
Christoph Hellwig9d8b88f2010-05-06 22:04:34 +0200126static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
ths6ada7452007-07-31 23:28:53 +0000127{
128 BDRVParallelsState *s = bs->opaque;
David Woodhousec34d2452009-11-07 14:10:01 +0000129 uint32_t index, offset;
ths6ada7452007-07-31 23:28:53 +0000130
131 index = sector_num / s->tracks;
132 offset = sector_num % s->tracks;
133
Christoph Hellwig9d8b88f2010-05-06 22:04:34 +0200134 /* not allocated */
ths6ada7452007-07-31 23:28:53 +0000135 if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
136 return -1;
Christoph Hellwig9d8b88f2010-05-06 22:04:34 +0200137 return (uint64_t)(s->catalog_bitmap[index] + offset) * 512;
ths6ada7452007-07-31 23:28:53 +0000138}
139
140static int parallels_read(BlockDriverState *bs, int64_t sector_num,
141 uint8_t *buf, int nb_sectors)
142{
ths6ada7452007-07-31 23:28:53 +0000143 while (nb_sectors > 0) {
Christoph Hellwig9d8b88f2010-05-06 22:04:34 +0200144 int64_t position = seek_to_sector(bs, sector_num);
145 if (position >= 0) {
Christoph Hellwig1dec5a72010-05-06 22:04:50 +0200146 if (bdrv_pread(bs->file, position, buf, 512) != 512)
Christoph Hellwig9d8b88f2010-05-06 22:04:34 +0200147 return -1;
148 } else {
ths6ada7452007-07-31 23:28:53 +0000149 memset(buf, 0, 512);
Christoph Hellwig9d8b88f2010-05-06 22:04:34 +0200150 }
ths6ada7452007-07-31 23:28:53 +0000151 nb_sectors--;
152 sector_num++;
153 buf += 512;
154 }
155 return 0;
156}
157
Paolo Bonzini2914caa2011-10-20 13:16:22 +0200158static 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
ths6ada7452007-07-31 23:28:53 +0000169static void parallels_close(BlockDriverState *bs)
170{
171 BDRVParallelsState *s = bs->opaque;
Anthony Liguori7267c092011-08-20 22:09:37 -0500172 g_free(s->catalog_bitmap);
ths6ada7452007-07-31 23:28:53 +0000173}
174
Anthony Liguori5efa9d52009-05-09 17:03:42 -0500175static BlockDriver bdrv_parallels = {
aurel32e60f4692009-03-07 22:00:29 +0000176 .format_name = "parallels",
177 .instance_size = sizeof(BDRVParallelsState),
178 .bdrv_probe = parallels_probe,
Christoph Hellwig1dec5a72010-05-06 22:04:50 +0200179 .bdrv_open = parallels_open,
Paolo Bonzini2914caa2011-10-20 13:16:22 +0200180 .bdrv_read = parallels_co_read,
aurel32e60f4692009-03-07 22:00:29 +0000181 .bdrv_close = parallels_close,
ths6ada7452007-07-31 23:28:53 +0000182};
Anthony Liguori5efa9d52009-05-09 17:03:42 -0500183
184static void bdrv_parallels_init(void)
185{
186 bdrv_register(&bdrv_parallels);
187}
188
189block_init(bdrv_parallels_init);