ia64/xen-unstable

view tools/ioemu/block-bochs.c @ 15841:c5f735271e22

[IA64] Foreign p2m: Fix vti domain builder.

It should set arch_domain::convmem_end.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Alex Williamson <alex.williamson@hp.com>
date Thu Sep 06 13:48:43 2007 -0600 (2007-09-06)
parents 00618037d37d
children
line source
1 /*
2 * Block driver for the various disk image formats used by Bochs
3 * Currently only for "growing" type in read-only mode
4 *
5 * Copyright (c) 2005 Alex Beregszaszi
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25 #include "vl.h"
26 #include "block_int.h"
28 /**************************************************************/
30 #define HEADER_MAGIC "Bochs Virtual HD Image"
31 #define HEADER_VERSION 0x00020000
32 #define HEADER_V1 0x00010000
33 #define HEADER_SIZE 512
35 #define REDOLOG_TYPE "Redolog"
36 #define GROWING_TYPE "Growing"
38 // not allocated: 0xffffffff
40 // always little-endian
41 struct bochs_header_v1 {
42 char magic[32]; // "Bochs Virtual HD Image"
43 char type[16]; // "Redolog"
44 char subtype[16]; // "Undoable" / "Volatile" / "Growing"
45 uint32_t version;
46 uint32_t header; // size of header
48 union {
49 struct {
50 uint32_t catalog; // num of entries
51 uint32_t bitmap; // bitmap size
52 uint32_t extent; // extent size
53 uint64_t disk; // disk size
54 char padding[HEADER_SIZE - 64 - 8 - 20];
55 } redolog;
56 char padding[HEADER_SIZE - 64 - 8];
57 } extra;
58 };
60 // always little-endian
61 struct bochs_header {
62 char magic[32]; // "Bochs Virtual HD Image"
63 char type[16]; // "Redolog"
64 char subtype[16]; // "Undoable" / "Volatile" / "Growing"
65 uint32_t version;
66 uint32_t header; // size of header
68 union {
69 struct {
70 uint32_t catalog; // num of entries
71 uint32_t bitmap; // bitmap size
72 uint32_t extent; // extent size
73 uint32_t reserved; // for ???
74 uint64_t disk; // disk size
75 char padding[HEADER_SIZE - 64 - 8 - 24];
76 } redolog;
77 char padding[HEADER_SIZE - 64 - 8];
78 } extra;
79 };
81 typedef struct BDRVBochsState {
82 int fd;
84 uint32_t *catalog_bitmap;
85 int catalog_size;
87 int data_offset;
89 int bitmap_blocks;
90 int extent_blocks;
91 int extent_size;
92 } BDRVBochsState;
94 static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
95 {
96 const struct bochs_header *bochs = (const void *)buf;
98 if (buf_size < HEADER_SIZE)
99 return 0;
101 if (!strcmp(bochs->magic, HEADER_MAGIC) &&
102 !strcmp(bochs->type, REDOLOG_TYPE) &&
103 !strcmp(bochs->subtype, GROWING_TYPE) &&
104 ((le32_to_cpu(bochs->version) == HEADER_VERSION) ||
105 (le32_to_cpu(bochs->version) == HEADER_V1)))
106 return 100;
108 return 0;
109 }
111 static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
112 {
113 BDRVBochsState *s = bs->opaque;
114 int fd, i;
115 struct bochs_header bochs;
116 struct bochs_header_v1 header_v1;
118 fd = open(filename, O_RDWR | O_BINARY);
119 if (fd < 0) {
120 fd = open(filename, O_RDONLY | O_BINARY);
121 if (fd < 0)
122 return -1;
123 }
125 bs->read_only = 1; // no write support yet
127 s->fd = fd;
129 if (read(fd, &bochs, sizeof(bochs)) != sizeof(bochs)) {
130 goto fail;
131 }
133 if (strcmp(bochs.magic, HEADER_MAGIC) ||
134 strcmp(bochs.type, REDOLOG_TYPE) ||
135 strcmp(bochs.subtype, GROWING_TYPE) ||
136 ((le32_to_cpu(bochs.version) != HEADER_VERSION) &&
137 (le32_to_cpu(bochs.version) != HEADER_V1))) {
138 goto fail;
139 }
141 if (le32_to_cpu(bochs.version) == HEADER_V1) {
142 memcpy(&header_v1, &bochs, sizeof(bochs));
143 bs->total_sectors = le64_to_cpu(header_v1.extra.redolog.disk) / 512;
144 } else {
145 bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512;
146 }
148 lseek(s->fd, le32_to_cpu(bochs.header), SEEK_SET);
150 s->catalog_size = le32_to_cpu(bochs.extra.redolog.catalog);
151 s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
152 if (!s->catalog_bitmap)
153 goto fail;
154 if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
155 s->catalog_size * 4)
156 goto fail;
157 for (i = 0; i < s->catalog_size; i++)
158 le32_to_cpus(&s->catalog_bitmap[i]);
160 s->data_offset = le32_to_cpu(bochs.header) + (s->catalog_size * 4);
162 s->bitmap_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.bitmap) - 1) / 512;
163 s->extent_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.extent) - 1) / 512;
165 s->extent_size = le32_to_cpu(bochs.extra.redolog.extent);
167 return 0;
168 fail:
169 close(fd);
170 return -1;
171 }
173 static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
174 {
175 BDRVBochsState *s = bs->opaque;
176 int64_t offset = sector_num * 512;
177 int64_t extent_index, extent_offset, bitmap_offset, block_offset;
178 char bitmap_entry;
180 // seek to sector
181 extent_index = offset / s->extent_size;
182 extent_offset = (offset % s->extent_size) / 512;
184 if (s->catalog_bitmap[extent_index] == 0xffffffff)
185 {
186 // fprintf(stderr, "page not allocated [%x - %x:%x]\n",
187 // sector_num, extent_index, extent_offset);
188 return -1; // not allocated
189 }
191 bitmap_offset = s->data_offset + (512 * s->catalog_bitmap[extent_index] *
192 (s->extent_blocks + s->bitmap_blocks));
193 block_offset = bitmap_offset + (512 * (s->bitmap_blocks + extent_offset));
195 // fprintf(stderr, "sect: %x [ext i: %x o: %x] -> %x bitmap: %x block: %x\n",
196 // sector_num, extent_index, extent_offset,
197 // le32_to_cpu(s->catalog_bitmap[extent_index]),
198 // bitmap_offset, block_offset);
200 // read in bitmap for current extent
201 lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET);
203 read(s->fd, &bitmap_entry, 1);
205 if (!((bitmap_entry >> (extent_offset % 8)) & 1))
206 {
207 // fprintf(stderr, "sector (%x) in bitmap not allocated\n",
208 // sector_num);
209 return -1; // not allocated
210 }
212 lseek(s->fd, block_offset, SEEK_SET);
214 return 0;
215 }
217 static int bochs_read(BlockDriverState *bs, int64_t sector_num,
218 uint8_t *buf, int nb_sectors)
219 {
220 BDRVBochsState *s = bs->opaque;
221 int ret;
223 while (nb_sectors > 0) {
224 if (!seek_to_sector(bs, sector_num))
225 {
226 ret = read(s->fd, buf, 512);
227 if (ret != 512)
228 return -1;
229 }
230 else
231 memset(buf, 0, 512);
232 nb_sectors--;
233 sector_num++;
234 buf += 512;
235 }
236 return 0;
237 }
239 static void bochs_close(BlockDriverState *bs)
240 {
241 BDRVBochsState *s = bs->opaque;
242 qemu_free(s->catalog_bitmap);
243 close(s->fd);
244 }
246 BlockDriver bdrv_bochs = {
247 "bochs",
248 sizeof(BDRVBochsState),
249 bochs_probe,
250 bochs_open,
251 bochs_read,
252 NULL,
253 bochs_close,
254 };