Add pci_find_bus
[qemu-kvm/fedora.git] / block-parallels.c
blob4654b07b159facffbca85f5ccd7031353f6d4e35
1 /*
2 * Block driver for Parallels disk image format
4 * Copyright (c) 2007 Alex Beregszaszi
6 * This code is based on comparing different disk images created by Parallels.
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:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
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.
26 #include "qemu-common.h"
27 #include "block_int.h"
29 /**************************************************************/
31 #define HEADER_MAGIC "WithoutFreeSpace"
32 #define HEADER_VERSION 2
33 #define HEADER_SIZE 64
35 // always little-endian
36 struct parallels_header {
37 char magic[16]; // "WithoutFreeSpace"
38 uint32_t version;
39 uint32_t heads;
40 uint32_t cylinders;
41 uint32_t tracks;
42 uint32_t catalog_entries;
43 uint32_t nb_sectors;
44 char padding[24];
45 } __attribute__((packed));
47 typedef struct BDRVParallelsState {
48 int fd;
50 uint32_t *catalog_bitmap;
51 int catalog_size;
53 int tracks;
54 } BDRVParallelsState;
56 static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
58 const struct parallels_header *ph = (const void *)buf;
60 if (buf_size < HEADER_SIZE)
61 return 0;
63 if (!memcmp(ph->magic, HEADER_MAGIC, 16) &&
64 (le32_to_cpu(ph->version) == HEADER_VERSION))
65 return 100;
67 return 0;
70 static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
72 BDRVParallelsState *s = bs->opaque;
73 int fd, i;
74 struct parallels_header ph;
76 fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
77 if (fd < 0) {
78 fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
79 if (fd < 0)
80 return -1;
83 bs->read_only = 1; // no write support yet
85 s->fd = fd;
87 if (read(fd, &ph, sizeof(ph)) != sizeof(ph))
88 goto fail;
90 if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
91 (le32_to_cpu(ph.version) != HEADER_VERSION)) {
92 goto fail;
95 bs->total_sectors = le32_to_cpu(ph.nb_sectors);
97 if (lseek(s->fd, 64, SEEK_SET) != 64)
98 goto fail;
100 s->tracks = le32_to_cpu(ph.tracks);
102 s->catalog_size = le32_to_cpu(ph.catalog_entries);
103 s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
104 if (!s->catalog_bitmap)
105 goto fail;
106 if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
107 s->catalog_size * 4)
108 goto fail;
109 for (i = 0; i < s->catalog_size; i++)
110 le32_to_cpus(&s->catalog_bitmap[i]);
112 return 0;
113 fail:
114 if (s->catalog_bitmap)
115 qemu_free(s->catalog_bitmap);
116 close(fd);
117 return -1;
120 static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
122 BDRVParallelsState *s = bs->opaque;
123 uint32_t index, offset, position;
125 index = sector_num / s->tracks;
126 offset = sector_num % s->tracks;
128 // not allocated
129 if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
130 return -1;
132 position = (s->catalog_bitmap[index] + offset) * 512;
134 // fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n",
135 // sector_num, index, offset, s->catalog_bitmap[index], position);
137 if (lseek(s->fd, position, SEEK_SET) != position)
138 return -1;
140 return 0;
143 static int parallels_read(BlockDriverState *bs, int64_t sector_num,
144 uint8_t *buf, int nb_sectors)
146 BDRVParallelsState *s = bs->opaque;
148 while (nb_sectors > 0) {
149 if (!seek_to_sector(bs, sector_num)) {
150 if (read(s->fd, buf, 512) != 512)
151 return -1;
152 } else
153 memset(buf, 0, 512);
154 nb_sectors--;
155 sector_num++;
156 buf += 512;
158 return 0;
161 static void parallels_close(BlockDriverState *bs)
163 BDRVParallelsState *s = bs->opaque;
164 qemu_free(s->catalog_bitmap);
165 close(s->fd);
168 BlockDriver bdrv_parallels = {
169 "parallels",
170 sizeof(BDRVParallelsState),
171 parallels_probe,
172 parallels_open,
173 parallels_read,
174 NULL,
175 parallels_close,