Revision b71d1c2e
| b/block-vpc.c | ||
|---|---|---|
| 105 | 105 |
}; |
| 106 | 106 |
|
| 107 | 107 |
typedef struct BDRVVPCState {
|
| 108 |
int fd;
|
|
| 108 |
BlockDriverState *hd;
|
|
| 109 | 109 |
|
| 110 | 110 |
int max_table_entries; |
| 111 | 111 |
uint32_t *pagetable; |
| ... | ... | |
| 130 | 130 |
static int vpc_open(BlockDriverState *bs, const char *filename, int flags) |
| 131 | 131 |
{
|
| 132 | 132 |
BDRVVPCState *s = bs->opaque; |
| 133 |
int fd, i;
|
|
| 133 |
int ret, i;
|
|
| 134 | 134 |
struct vhd_footer* footer; |
| 135 | 135 |
struct vhd_dyndisk_header* dyndisk_header; |
| 136 | 136 |
uint8_t buf[HEADER_SIZE]; |
| 137 | 137 |
|
| 138 |
fd = open(filename, O_RDONLY | O_BINARY); |
|
| 139 |
if (fd < 0) |
|
| 140 |
return -1; |
|
| 141 |
|
|
| 142 | 138 |
bs->read_only = 1; // no write support yet |
| 143 | 139 |
|
| 144 |
s->fd = fd; |
|
| 140 |
ret = bdrv_file_open(&s->hd, filename, flags); |
|
| 141 |
if (ret < 0) |
|
| 142 |
return ret; |
|
| 145 | 143 |
|
| 146 |
if (read(fd, buf, HEADER_SIZE) != HEADER_SIZE)
|
|
| 144 |
if (bdrv_pread(s->hd, 0, buf, HEADER_SIZE) != HEADER_SIZE)
|
|
| 147 | 145 |
goto fail; |
| 148 | 146 |
|
| 149 | 147 |
footer = (struct vhd_footer*) buf; |
| ... | ... | |
| 156 | 154 |
bs->total_sectors = (int64_t) |
| 157 | 155 |
be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; |
| 158 | 156 |
|
| 159 |
lseek(s->fd, be64_to_cpu(footer->data_offset), SEEK_SET);
|
|
| 160 |
if (read(fd, buf, HEADER_SIZE) != HEADER_SIZE)
|
|
| 157 |
if (bdrv_pread(s->hd, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
|
|
| 158 |
!= HEADER_SIZE)
|
|
| 161 | 159 |
goto fail; |
| 162 | 160 |
|
| 163 | 161 |
footer = NULL; |
| ... | ... | |
| 166 | 164 |
if (strncmp(dyndisk_header->magic, "cxsparse", 8)) |
| 167 | 165 |
goto fail; |
| 168 | 166 |
|
| 169 |
lseek(s->fd, be64_to_cpu(dyndisk_header->table_offset), SEEK_SET); |
|
| 170 | 167 |
|
| 171 | 168 |
s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
| 172 | 169 |
s->pagetable = qemu_malloc(s->max_table_entries * 4); |
| 173 | 170 |
if (!s->pagetable) |
| 174 |
goto fail; |
|
| 175 |
if (read(s->fd, s->pagetable, s->max_table_entries * 4) != |
|
| 176 |
s->max_table_entries * 4) |
|
| 177 |
goto fail; |
|
| 171 |
goto fail; |
|
| 172 |
|
|
| 173 |
if (bdrv_pread(s->hd, be64_to_cpu(dyndisk_header->table_offset), |
|
| 174 |
s->pagetable, s->max_table_entries * 4) != s->max_table_entries * 4) |
|
| 175 |
goto fail; |
|
| 176 |
|
|
| 178 | 177 |
for (i = 0; i < s->max_table_entries; i++) |
| 179 | 178 |
be32_to_cpus(&s->pagetable[i]); |
| 180 | 179 |
|
| ... | ... | |
| 190 | 189 |
|
| 191 | 190 |
return 0; |
| 192 | 191 |
fail: |
| 193 |
close(fd);
|
|
| 192 |
bdrv_delete(s->hd);
|
|
| 194 | 193 |
return -1; |
| 195 | 194 |
} |
| 196 | 195 |
|
| 197 |
static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) |
|
| 196 |
/* |
|
| 197 |
* Returns the absolute byte offset of the given sector in the image file. |
|
| 198 |
* If the sector is not allocated, -1 is returned instead. |
|
| 199 |
*/ |
|
| 200 |
static inline int64_t get_sector_offset(BlockDriverState *bs, int64_t sector_num) |
|
| 198 | 201 |
{
|
| 199 | 202 |
BDRVVPCState *s = bs->opaque; |
| 200 | 203 |
uint64_t offset = sector_num * 512; |
| ... | ... | |
| 241 | 244 |
return -1; // not allocated |
| 242 | 245 |
#endif |
| 243 | 246 |
#endif |
| 244 |
lseek(s->fd, block_offset, SEEK_SET); |
|
| 245 | 247 |
|
| 246 |
return 0;
|
|
| 248 |
return block_offset;
|
|
| 247 | 249 |
} |
| 248 | 250 |
|
| 249 | 251 |
static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
| ... | ... | |
| 251 | 253 |
{
|
| 252 | 254 |
BDRVVPCState *s = bs->opaque; |
| 253 | 255 |
int ret; |
| 256 |
int64_t offset; |
|
| 254 | 257 |
|
| 255 | 258 |
while (nb_sectors > 0) {
|
| 256 |
if (!seek_to_sector(bs, sector_num)) |
|
| 257 |
{
|
|
| 258 |
ret = read(s->fd, buf, 512); |
|
| 259 |
if (ret != 512) |
|
| 260 |
return -1; |
|
| 261 |
} |
|
| 262 |
else |
|
| 259 |
offset = get_sector_offset(bs, sector_num); |
|
| 260 |
|
|
| 261 |
if (offset == -1) {
|
|
| 263 | 262 |
memset(buf, 0, 512); |
| 263 |
} else {
|
|
| 264 |
ret = bdrv_pread(s->hd, offset, buf, 512); |
|
| 265 |
if (ret != 512) |
|
| 266 |
return -1; |
|
| 267 |
} |
|
| 268 |
|
|
| 264 | 269 |
nb_sectors--; |
| 265 | 270 |
sector_num++; |
| 266 | 271 |
buf += 512; |
| ... | ... | |
| 275 | 280 |
#ifdef CACHE |
| 276 | 281 |
qemu_free(s->pageentry_u8); |
| 277 | 282 |
#endif |
| 278 |
close(s->fd);
|
|
| 283 |
bdrv_delete(s->hd);
|
|
| 279 | 284 |
} |
| 280 | 285 |
|
| 281 | 286 |
BlockDriver bdrv_vpc = {
|
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