Revision 83f64091 block-cow.c
| b/block-cow.c | ||
|---|---|---|
| 62 | 62 |
return 0; |
| 63 | 63 |
} |
| 64 | 64 |
|
| 65 |
static int cow_open(BlockDriverState *bs, const char *filename) |
|
| 65 |
static int cow_open(BlockDriverState *bs, const char *filename, int flags)
|
|
| 66 | 66 |
{
|
| 67 | 67 |
BDRVCowState *s = bs->opaque; |
| 68 | 68 |
int fd; |
| ... | ... | |
| 93 | 93 |
pstrcpy(bs->backing_file, sizeof(bs->backing_file), |
| 94 | 94 |
cow_header.backing_file); |
| 95 | 95 |
|
| 96 |
#if 0 |
|
| 97 |
if (cow_header.backing_file[0] != '\0') {
|
|
| 98 |
if (stat(cow_header.backing_file, &st) != 0) {
|
|
| 99 |
fprintf(stderr, "%s: could not find original disk image '%s'\n", filename, cow_header.backing_file); |
|
| 100 |
goto fail; |
|
| 101 |
} |
|
| 102 |
if (st.st_mtime != be32_to_cpu(cow_header.mtime)) {
|
|
| 103 |
fprintf(stderr, "%s: original raw disk image '%s' does not match saved timestamp\n", filename, cow_header.backing_file); |
|
| 104 |
goto fail; |
|
| 105 |
} |
|
| 106 |
fd = open(cow_header.backing_file, O_RDONLY | O_LARGEFILE); |
|
| 107 |
if (fd < 0) |
|
| 108 |
goto fail; |
|
| 109 |
bs->fd = fd; |
|
| 110 |
} |
|
| 111 |
#endif |
|
| 112 | 96 |
/* mmap the bitmap */ |
| 113 | 97 |
s->cow_bitmap_size = ((bs->total_sectors + 7) >> 3) + sizeof(cow_header); |
| 114 | 98 |
s->cow_bitmap_addr = mmap(get_mmap_addr(s->cow_bitmap_size), |
| ... | ... | |
| 179 | 163 |
if (ret != n * 512) |
| 180 | 164 |
return -1; |
| 181 | 165 |
} else {
|
| 166 |
if (bs->backing_hd) {
|
|
| 167 |
/* read from the base image */ |
|
| 168 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
|
| 169 |
if (ret < 0) |
|
| 170 |
return -1; |
|
| 171 |
} else {
|
|
| 182 | 172 |
memset(buf, 0, n * 512); |
| 183 | 173 |
} |
| 174 |
} |
|
| 184 | 175 |
nb_sectors -= n; |
| 185 | 176 |
sector_num += n; |
| 186 | 177 |
buf += n * 512; |
| ... | ... | |
| 220 | 211 |
if (flags) |
| 221 | 212 |
return -ENOTSUP; |
| 222 | 213 |
|
| 223 |
cow_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
| 214 |
cow_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, |
|
| 224 | 215 |
0644); |
| 225 | 216 |
if (cow_fd < 0) |
| 226 | 217 |
return -1; |
| ... | ... | |
| 228 | 219 |
cow_header.magic = cpu_to_be32(COW_MAGIC); |
| 229 | 220 |
cow_header.version = cpu_to_be32(COW_VERSION); |
| 230 | 221 |
if (image_filename) {
|
| 222 |
/* Note: if no file, we put a dummy mtime */ |
|
| 223 |
cow_header.mtime = cpu_to_be32(0); |
|
| 224 |
|
|
| 231 | 225 |
fd = open(image_filename, O_RDONLY | O_BINARY); |
| 232 | 226 |
if (fd < 0) {
|
| 233 | 227 |
close(cow_fd); |
| 234 |
return -1;
|
|
| 228 |
goto mtime_fail;
|
|
| 235 | 229 |
} |
| 236 | 230 |
if (fstat(fd, &st) != 0) {
|
| 237 | 231 |
close(fd); |
| 238 |
return -1;
|
|
| 232 |
goto mtime_fail;
|
|
| 239 | 233 |
} |
| 240 | 234 |
close(fd); |
| 241 | 235 |
cow_header.mtime = cpu_to_be32(st.st_mtime); |
| 242 |
realpath(image_filename, cow_header.backing_file); |
|
| 236 |
mtime_fail: |
|
| 237 |
pstrcpy(cow_header.backing_file, sizeof(cow_header.backing_file), |
|
| 238 |
image_filename); |
|
| 243 | 239 |
} |
| 244 | 240 |
cow_header.sectorsize = cpu_to_be32(512); |
| 245 | 241 |
cow_header.size = cpu_to_be64(image_sectors * 512); |
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