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/*
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* Block driver for the VMDK format
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*
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* Copyright (c) 2004 Fabrice Bellard
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* Copyright (c) 2005 Filip Navara
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
27 |
#include "block_int.h" |
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#include "module.h" |
29 |
|
30 |
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') |
31 |
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') |
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|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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uint32_t disk_sectors; |
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uint32_t granularity; |
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uint32_t l1dir_offset; |
39 |
uint32_t l1dir_size; |
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uint32_t file_sectors; |
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uint32_t cylinders; |
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uint32_t heads; |
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uint32_t sectors_per_track; |
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} VMDK3Header; |
45 |
|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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int64_t capacity; |
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int64_t granularity; |
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int64_t desc_offset; |
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int64_t desc_size; |
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int32_t num_gtes_per_gte; |
54 |
int64_t rgd_offset; |
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int64_t gd_offset; |
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int64_t grain_offset; |
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char filler[1]; |
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char check_bytes[4]; |
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} __attribute__((packed)) VMDK4Header; |
60 |
|
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#define L2_CACHE_SIZE 16 |
62 |
|
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typedef struct BDRVVmdkState { |
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BlockDriverState *hd; |
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int64_t l1_table_offset; |
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int64_t l1_backup_table_offset; |
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uint32_t *l1_table; |
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uint32_t *l1_backup_table; |
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unsigned int l1_size; |
70 |
uint32_t l1_entry_sectors; |
71 |
|
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unsigned int l2_size; |
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uint32_t *l2_cache; |
74 |
uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
75 |
uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
76 |
|
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unsigned int cluster_sectors; |
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uint32_t parent_cid; |
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int is_parent;
|
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} BDRVVmdkState; |
81 |
|
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typedef struct VmdkMetaData { |
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uint32_t offset; |
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unsigned int l1_index; |
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unsigned int l2_index; |
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unsigned int l2_offset; |
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int valid;
|
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} VmdkMetaData; |
89 |
|
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typedef struct ActiveBDRVState{ |
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BlockDriverState *hd; // active image handler
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uint64_t cluster_offset; // current write offset
|
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}ActiveBDRVState; |
94 |
|
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static ActiveBDRVState activeBDRV;
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|
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|
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static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) |
99 |
{ |
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uint32_t magic; |
101 |
|
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if (buf_size < 4) |
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return 0; |
104 |
magic = be32_to_cpu(*(uint32_t *)buf); |
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if (magic == VMDK3_MAGIC ||
|
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magic == VMDK4_MAGIC) |
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return 100; |
108 |
else
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return 0; |
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} |
111 |
|
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#define CHECK_CID 1 |
113 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
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#define HEADER_SIZE 512 // first sector of 512 bytes |
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|
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
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{ |
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BDRVVmdkState *s = bs->opaque; |
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char desc[DESC_SIZE];
|
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uint32_t cid; |
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const char *p_name, *cid_str; |
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size_t cid_str_size; |
125 |
|
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/* the descriptor offset = 0x200 */
|
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if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
128 |
return 0; |
129 |
|
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if (parent) {
|
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cid_str = "parentCID";
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cid_str_size = sizeof("parentCID"); |
133 |
} else {
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cid_str = "CID";
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cid_str_size = sizeof("CID"); |
136 |
} |
137 |
|
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if ((p_name = strstr(desc,cid_str)) != NULL) { |
139 |
p_name += cid_str_size; |
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sscanf(p_name,"%x",&cid);
|
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} |
142 |
|
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return cid;
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} |
145 |
|
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
147 |
{ |
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BDRVVmdkState *s = bs->opaque; |
149 |
char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
|
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char *p_name, *tmp_str;
|
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|
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/* the descriptor offset = 0x200 */
|
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if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
154 |
return -1; |
155 |
|
156 |
tmp_str = strstr(desc,"parentCID");
|
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pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
|
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if ((p_name = strstr(desc,"CID")) != NULL) { |
159 |
p_name += sizeof("CID"); |
160 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
161 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
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} |
163 |
|
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if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
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return -1; |
166 |
return 0; |
167 |
} |
168 |
|
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static int vmdk_is_cid_valid(BlockDriverState *bs) |
170 |
{ |
171 |
#ifdef CHECK_CID
|
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BDRVVmdkState *s = bs->opaque; |
173 |
BlockDriverState *p_bs = bs->backing_hd; |
174 |
uint32_t cur_pcid; |
175 |
|
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if (p_bs) {
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cur_pcid = vmdk_read_cid(p_bs,0);
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if (s->parent_cid != cur_pcid)
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// CID not valid
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return 0; |
181 |
} |
182 |
#endif
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// CID valid
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return 1; |
185 |
} |
186 |
|
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static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
188 |
{ |
189 |
int snp_fd, p_fd;
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int ret;
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uint32_t p_cid; |
192 |
char *p_name, *gd_buf, *rgd_buf;
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const char *real_filename, *temp_str; |
194 |
VMDK4Header header; |
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uint32_t gde_entries, gd_size; |
196 |
int64_t gd_offset, rgd_offset, capacity, gt_size; |
197 |
char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
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static const char desc_template[] = |
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"# Disk DescriptorFile\n"
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"version=1\n"
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"CID=%x\n"
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"parentCID=%x\n"
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"createType=\"monolithicSparse\"\n"
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"parentFileNameHint=\"%s\"\n"
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"\n"
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"# Extent description\n"
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"RW %u SPARSE \"%s\"\n"
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"\n"
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"# The Disk Data Base \n"
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"#DDB\n"
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"\n";
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212 |
|
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snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
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if (snp_fd < 0) |
215 |
return -errno;
|
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p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
217 |
if (p_fd < 0) { |
218 |
close(snp_fd); |
219 |
return -errno;
|
220 |
} |
221 |
|
222 |
/* read the header */
|
223 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
224 |
ret = -errno; |
225 |
goto fail;
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226 |
} |
227 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
|
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ret = -errno; |
229 |
goto fail;
|
230 |
} |
231 |
|
232 |
/* write the header */
|
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if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
234 |
ret = -errno; |
235 |
goto fail;
|
236 |
} |
237 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) { |
238 |
ret = -errno; |
239 |
goto fail;
|
240 |
} |
241 |
|
242 |
memset(&header, 0, sizeof(header)); |
243 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
244 |
|
245 |
if (ftruncate(snp_fd, header.grain_offset << 9)) { |
246 |
ret = -errno; |
247 |
goto fail;
|
248 |
} |
249 |
/* the descriptor offset = 0x200 */
|
250 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
251 |
ret = -errno; |
252 |
goto fail;
|
253 |
} |
254 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
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ret = -errno; |
256 |
goto fail;
|
257 |
} |
258 |
|
259 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
260 |
p_name += sizeof("CID"); |
261 |
sscanf(p_name,"%x",&p_cid);
|
262 |
} |
263 |
|
264 |
real_filename = filename; |
265 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
266 |
real_filename = temp_str + 1;
|
267 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
268 |
real_filename = temp_str + 1;
|
269 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
270 |
real_filename = temp_str + 1;
|
271 |
|
272 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
|
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(uint32_t)header.capacity, real_filename); |
274 |
|
275 |
/* write the descriptor */
|
276 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
277 |
ret = -errno; |
278 |
goto fail;
|
279 |
} |
280 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { |
281 |
ret = -errno; |
282 |
goto fail;
|
283 |
} |
284 |
|
285 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
286 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
287 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
288 |
/*
|
289 |
* Each GDE span 32M disk, means:
|
290 |
* 512 GTE per GT, each GTE points to grain
|
291 |
*/
|
292 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
293 |
if (!gt_size) {
|
294 |
ret = -EINVAL; |
295 |
goto fail;
|
296 |
} |
297 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
298 |
gd_size = gde_entries * sizeof(uint32_t);
|
299 |
|
300 |
/* write RGD */
|
301 |
rgd_buf = qemu_malloc(gd_size); |
302 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
303 |
ret = -errno; |
304 |
goto fail_rgd;
|
305 |
} |
306 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
307 |
ret = -errno; |
308 |
goto fail_rgd;
|
309 |
} |
310 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { |
311 |
ret = -errno; |
312 |
goto fail_rgd;
|
313 |
} |
314 |
if (write(snp_fd, rgd_buf, gd_size) == -1) { |
315 |
ret = -errno; |
316 |
goto fail_rgd;
|
317 |
} |
318 |
|
319 |
/* write GD */
|
320 |
gd_buf = qemu_malloc(gd_size); |
321 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
322 |
ret = -errno; |
323 |
goto fail_gd;
|
324 |
} |
325 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
326 |
ret = -errno; |
327 |
goto fail_gd;
|
328 |
} |
329 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { |
330 |
ret = -errno; |
331 |
goto fail_gd;
|
332 |
} |
333 |
if (write(snp_fd, gd_buf, gd_size) == -1) { |
334 |
ret = -errno; |
335 |
goto fail_gd;
|
336 |
} |
337 |
qemu_free(gd_buf); |
338 |
qemu_free(rgd_buf); |
339 |
|
340 |
close(p_fd); |
341 |
close(snp_fd); |
342 |
return 0; |
343 |
|
344 |
fail_gd:
|
345 |
qemu_free(gd_buf); |
346 |
fail_rgd:
|
347 |
qemu_free(rgd_buf); |
348 |
fail:
|
349 |
close(p_fd); |
350 |
close(snp_fd); |
351 |
return ret;
|
352 |
} |
353 |
|
354 |
static void vmdk_parent_close(BlockDriverState *bs) |
355 |
{ |
356 |
if (bs->backing_hd)
|
357 |
bdrv_close(bs->backing_hd); |
358 |
} |
359 |
|
360 |
static int parent_open = 0; |
361 |
static int vmdk_parent_open(BlockDriverState *bs, const char * filename) |
362 |
{ |
363 |
BDRVVmdkState *s = bs->opaque; |
364 |
char *p_name;
|
365 |
char desc[DESC_SIZE];
|
366 |
char parent_img_name[1024]; |
367 |
|
368 |
/* the descriptor offset = 0x200 */
|
369 |
if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
370 |
return -1; |
371 |
|
372 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
373 |
char *end_name;
|
374 |
struct stat file_buf;
|
375 |
|
376 |
p_name += sizeof("parentFileNameHint") + 1; |
377 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
378 |
return -1; |
379 |
if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
380 |
return -1; |
381 |
|
382 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
383 |
if (stat(bs->backing_file, &file_buf) != 0) { |
384 |
path_combine(parent_img_name, sizeof(parent_img_name),
|
385 |
filename, bs->backing_file); |
386 |
} else {
|
387 |
pstrcpy(parent_img_name, sizeof(parent_img_name),
|
388 |
bs->backing_file); |
389 |
} |
390 |
|
391 |
bs->backing_hd = bdrv_new("");
|
392 |
if (!bs->backing_hd) {
|
393 |
failure:
|
394 |
bdrv_close(s->hd); |
395 |
return -1; |
396 |
} |
397 |
parent_open = 1;
|
398 |
if (bdrv_open(bs->backing_hd, parent_img_name, 0) < 0) |
399 |
goto failure;
|
400 |
parent_open = 0;
|
401 |
} |
402 |
|
403 |
return 0; |
404 |
} |
405 |
|
406 |
static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) |
407 |
{ |
408 |
BDRVVmdkState *s = bs->opaque; |
409 |
uint32_t magic; |
410 |
int l1_size, i, ret;
|
411 |
|
412 |
if (parent_open) {
|
413 |
/* Parent must be opened as RO, no RDWR. */
|
414 |
flags = 0;
|
415 |
} |
416 |
|
417 |
ret = bdrv_file_open(&s->hd, filename, flags); |
418 |
if (ret < 0) |
419 |
return ret;
|
420 |
if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) |
421 |
goto fail;
|
422 |
|
423 |
magic = be32_to_cpu(magic); |
424 |
if (magic == VMDK3_MAGIC) {
|
425 |
VMDK3Header header; |
426 |
|
427 |
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) |
428 |
goto fail;
|
429 |
s->cluster_sectors = le32_to_cpu(header.granularity); |
430 |
s->l2_size = 1 << 9; |
431 |
s->l1_size = 1 << 6; |
432 |
bs->total_sectors = le32_to_cpu(header.disk_sectors); |
433 |
s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
|
434 |
s->l1_backup_table_offset = 0;
|
435 |
s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
436 |
} else if (magic == VMDK4_MAGIC) { |
437 |
VMDK4Header header; |
438 |
|
439 |
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) |
440 |
goto fail;
|
441 |
bs->total_sectors = le64_to_cpu(header.capacity); |
442 |
s->cluster_sectors = le64_to_cpu(header.granularity); |
443 |
s->l2_size = le32_to_cpu(header.num_gtes_per_gte); |
444 |
s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
445 |
if (s->l1_entry_sectors <= 0) |
446 |
goto fail;
|
447 |
s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
|
448 |
/ s->l1_entry_sectors; |
449 |
s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
|
450 |
s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
|
451 |
|
452 |
if (parent_open)
|
453 |
s->is_parent = 1;
|
454 |
else
|
455 |
s->is_parent = 0;
|
456 |
|
457 |
// try to open parent images, if exist
|
458 |
if (vmdk_parent_open(bs, filename) != 0) |
459 |
goto fail;
|
460 |
// write the CID once after the image creation
|
461 |
s->parent_cid = vmdk_read_cid(bs,1);
|
462 |
} else {
|
463 |
goto fail;
|
464 |
} |
465 |
|
466 |
/* read the L1 table */
|
467 |
l1_size = s->l1_size * sizeof(uint32_t);
|
468 |
s->l1_table = qemu_malloc(l1_size); |
469 |
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
|
470 |
goto fail;
|
471 |
for(i = 0; i < s->l1_size; i++) { |
472 |
le32_to_cpus(&s->l1_table[i]); |
473 |
} |
474 |
|
475 |
if (s->l1_backup_table_offset) {
|
476 |
s->l1_backup_table = qemu_malloc(l1_size); |
477 |
if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
|
478 |
goto fail;
|
479 |
for(i = 0; i < s->l1_size; i++) { |
480 |
le32_to_cpus(&s->l1_backup_table[i]); |
481 |
} |
482 |
} |
483 |
|
484 |
s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
485 |
return 0; |
486 |
fail:
|
487 |
qemu_free(s->l1_backup_table); |
488 |
qemu_free(s->l1_table); |
489 |
qemu_free(s->l2_cache); |
490 |
bdrv_delete(s->hd); |
491 |
return -1; |
492 |
} |
493 |
|
494 |
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
495 |
uint64_t offset, int allocate);
|
496 |
|
497 |
static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, |
498 |
uint64_t offset, int allocate)
|
499 |
{ |
500 |
uint64_t parent_cluster_offset; |
501 |
BDRVVmdkState *s = bs->opaque; |
502 |
uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB |
503 |
|
504 |
// we will be here if it's first write on non-exist grain(cluster).
|
505 |
// try to read from parent image, if exist
|
506 |
if (bs->backing_hd) {
|
507 |
BDRVVmdkState *ps = bs->backing_hd->opaque; |
508 |
|
509 |
if (!vmdk_is_cid_valid(bs))
|
510 |
return -1; |
511 |
|
512 |
parent_cluster_offset = get_cluster_offset(bs->backing_hd, NULL,
|
513 |
offset, allocate); |
514 |
|
515 |
if (parent_cluster_offset) {
|
516 |
BDRVVmdkState *act_s = activeBDRV.hd->opaque; |
517 |
|
518 |
if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) |
519 |
return -1; |
520 |
|
521 |
//Write grain only into the active image
|
522 |
if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) |
523 |
return -1; |
524 |
} |
525 |
} |
526 |
return 0; |
527 |
} |
528 |
|
529 |
static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) |
530 |
{ |
531 |
BDRVVmdkState *s = bs->opaque; |
532 |
|
533 |
/* update L2 table */
|
534 |
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), |
535 |
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) |
536 |
return -1; |
537 |
/* update backup L2 table */
|
538 |
if (s->l1_backup_table_offset != 0) { |
539 |
m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; |
540 |
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), |
541 |
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) |
542 |
return -1; |
543 |
} |
544 |
|
545 |
return 0; |
546 |
} |
547 |
|
548 |
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
549 |
uint64_t offset, int allocate)
|
550 |
{ |
551 |
BDRVVmdkState *s = bs->opaque; |
552 |
unsigned int l1_index, l2_offset, l2_index; |
553 |
int min_index, i, j;
|
554 |
uint32_t min_count, *l2_table, tmp = 0;
|
555 |
uint64_t cluster_offset; |
556 |
|
557 |
if (m_data)
|
558 |
m_data->valid = 0;
|
559 |
|
560 |
l1_index = (offset >> 9) / s->l1_entry_sectors;
|
561 |
if (l1_index >= s->l1_size)
|
562 |
return 0; |
563 |
l2_offset = s->l1_table[l1_index]; |
564 |
if (!l2_offset)
|
565 |
return 0; |
566 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
567 |
if (l2_offset == s->l2_cache_offsets[i]) {
|
568 |
/* increment the hit count */
|
569 |
if (++s->l2_cache_counts[i] == 0xffffffff) { |
570 |
for(j = 0; j < L2_CACHE_SIZE; j++) { |
571 |
s->l2_cache_counts[j] >>= 1;
|
572 |
} |
573 |
} |
574 |
l2_table = s->l2_cache + (i * s->l2_size); |
575 |
goto found;
|
576 |
} |
577 |
} |
578 |
/* not found: load a new entry in the least used one */
|
579 |
min_index = 0;
|
580 |
min_count = 0xffffffff;
|
581 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
582 |
if (s->l2_cache_counts[i] < min_count) {
|
583 |
min_count = s->l2_cache_counts[i]; |
584 |
min_index = i; |
585 |
} |
586 |
} |
587 |
l2_table = s->l2_cache + (min_index * s->l2_size); |
588 |
if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != |
589 |
s->l2_size * sizeof(uint32_t))
|
590 |
return 0; |
591 |
|
592 |
s->l2_cache_offsets[min_index] = l2_offset; |
593 |
s->l2_cache_counts[min_index] = 1;
|
594 |
found:
|
595 |
l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
|
596 |
cluster_offset = le32_to_cpu(l2_table[l2_index]); |
597 |
|
598 |
if (!cluster_offset) {
|
599 |
if (!allocate)
|
600 |
return 0; |
601 |
// Avoid the L2 tables update for the images that have snapshots.
|
602 |
if (!s->is_parent) {
|
603 |
cluster_offset = bdrv_getlength(s->hd); |
604 |
bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9));
|
605 |
|
606 |
cluster_offset >>= 9;
|
607 |
tmp = cpu_to_le32(cluster_offset); |
608 |
l2_table[l2_index] = tmp; |
609 |
// Save the active image state
|
610 |
activeBDRV.cluster_offset = cluster_offset; |
611 |
activeBDRV.hd = bs; |
612 |
} |
613 |
/* First of all we write grain itself, to avoid race condition
|
614 |
* that may to corrupt the image.
|
615 |
* This problem may occur because of insufficient space on host disk
|
616 |
* or inappropriate VM shutdown.
|
617 |
*/
|
618 |
if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) |
619 |
return 0; |
620 |
|
621 |
if (m_data) {
|
622 |
m_data->offset = tmp; |
623 |
m_data->l1_index = l1_index; |
624 |
m_data->l2_index = l2_index; |
625 |
m_data->l2_offset = l2_offset; |
626 |
m_data->valid = 1;
|
627 |
} |
628 |
} |
629 |
cluster_offset <<= 9;
|
630 |
return cluster_offset;
|
631 |
} |
632 |
|
633 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
634 |
int nb_sectors, int *pnum) |
635 |
{ |
636 |
BDRVVmdkState *s = bs->opaque; |
637 |
int index_in_cluster, n;
|
638 |
uint64_t cluster_offset; |
639 |
|
640 |
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
641 |
index_in_cluster = sector_num % s->cluster_sectors; |
642 |
n = s->cluster_sectors - index_in_cluster; |
643 |
if (n > nb_sectors)
|
644 |
n = nb_sectors; |
645 |
*pnum = n; |
646 |
return (cluster_offset != 0); |
647 |
} |
648 |
|
649 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
650 |
uint8_t *buf, int nb_sectors)
|
651 |
{ |
652 |
BDRVVmdkState *s = bs->opaque; |
653 |
int index_in_cluster, n, ret;
|
654 |
uint64_t cluster_offset; |
655 |
|
656 |
while (nb_sectors > 0) { |
657 |
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
658 |
index_in_cluster = sector_num % s->cluster_sectors; |
659 |
n = s->cluster_sectors - index_in_cluster; |
660 |
if (n > nb_sectors)
|
661 |
n = nb_sectors; |
662 |
if (!cluster_offset) {
|
663 |
// try to read from parent image, if exist
|
664 |
if (bs->backing_hd) {
|
665 |
if (!vmdk_is_cid_valid(bs))
|
666 |
return -1; |
667 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
668 |
if (ret < 0) |
669 |
return -1; |
670 |
} else {
|
671 |
memset(buf, 0, 512 * n); |
672 |
} |
673 |
} else {
|
674 |
if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
675 |
return -1; |
676 |
} |
677 |
nb_sectors -= n; |
678 |
sector_num += n; |
679 |
buf += n * 512;
|
680 |
} |
681 |
return 0; |
682 |
} |
683 |
|
684 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
685 |
const uint8_t *buf, int nb_sectors) |
686 |
{ |
687 |
BDRVVmdkState *s = bs->opaque; |
688 |
VmdkMetaData m_data; |
689 |
int index_in_cluster, n;
|
690 |
uint64_t cluster_offset; |
691 |
static int cid_update = 0; |
692 |
|
693 |
if (sector_num > bs->total_sectors) {
|
694 |
fprintf(stderr, |
695 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
696 |
" total_sectors=0x%" PRIx64 "\n", |
697 |
sector_num, bs->total_sectors); |
698 |
return -1; |
699 |
} |
700 |
|
701 |
while (nb_sectors > 0) { |
702 |
index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
703 |
n = s->cluster_sectors - index_in_cluster; |
704 |
if (n > nb_sectors)
|
705 |
n = nb_sectors; |
706 |
cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); |
707 |
if (!cluster_offset)
|
708 |
return -1; |
709 |
|
710 |
if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
711 |
return -1; |
712 |
if (m_data.valid) {
|
713 |
/* update L2 tables */
|
714 |
if (vmdk_L2update(bs, &m_data) == -1) |
715 |
return -1; |
716 |
} |
717 |
nb_sectors -= n; |
718 |
sector_num += n; |
719 |
buf += n * 512;
|
720 |
|
721 |
// update CID on the first write every time the virtual disk is opened
|
722 |
if (!cid_update) {
|
723 |
vmdk_write_cid(bs, time(NULL));
|
724 |
cid_update++; |
725 |
} |
726 |
} |
727 |
return 0; |
728 |
} |
729 |
|
730 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
731 |
{ |
732 |
int fd, i;
|
733 |
VMDK4Header header; |
734 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
735 |
static const char desc_template[] = |
736 |
"# Disk DescriptorFile\n"
|
737 |
"version=1\n"
|
738 |
"CID=%x\n"
|
739 |
"parentCID=ffffffff\n"
|
740 |
"createType=\"monolithicSparse\"\n"
|
741 |
"\n"
|
742 |
"# Extent description\n"
|
743 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
744 |
"\n"
|
745 |
"# The Disk Data Base \n"
|
746 |
"#DDB\n"
|
747 |
"\n"
|
748 |
"ddb.virtualHWVersion = \"%d\"\n"
|
749 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
750 |
"ddb.geometry.heads = \"16\"\n"
|
751 |
"ddb.geometry.sectors = \"63\"\n"
|
752 |
"ddb.adapterType = \"ide\"\n";
|
753 |
char desc[1024]; |
754 |
const char *real_filename, *temp_str; |
755 |
int64_t total_size = 0;
|
756 |
const char *backing_file = NULL; |
757 |
int flags = 0; |
758 |
int ret;
|
759 |
|
760 |
// Read out options
|
761 |
while (options && options->name) {
|
762 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
763 |
total_size = options->value.n / 512;
|
764 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
765 |
backing_file = options->value.s; |
766 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
767 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
768 |
} |
769 |
options++; |
770 |
} |
771 |
|
772 |
/* XXX: add support for backing file */
|
773 |
if (backing_file) {
|
774 |
return vmdk_snapshot_create(filename, backing_file);
|
775 |
} |
776 |
|
777 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
778 |
0644);
|
779 |
if (fd < 0) |
780 |
return -errno;
|
781 |
magic = cpu_to_be32(VMDK4_MAGIC); |
782 |
memset(&header, 0, sizeof(header)); |
783 |
header.version = cpu_to_le32(1);
|
784 |
header.flags = cpu_to_le32(3); /* ?? */ |
785 |
header.capacity = cpu_to_le64(total_size); |
786 |
header.granularity = cpu_to_le64(128);
|
787 |
header.num_gtes_per_gte = cpu_to_le32(512);
|
788 |
|
789 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
790 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
791 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
792 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
793 |
|
794 |
header.desc_offset = 1;
|
795 |
header.desc_size = 20;
|
796 |
header.rgd_offset = header.desc_offset + header.desc_size; |
797 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
798 |
header.grain_offset = |
799 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
800 |
header.granularity - 1) / header.granularity) *
|
801 |
header.granularity; |
802 |
|
803 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
804 |
header.desc_size = cpu_to_le64(header.desc_size); |
805 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
806 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
807 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
808 |
|
809 |
header.check_bytes[0] = 0xa; |
810 |
header.check_bytes[1] = 0x20; |
811 |
header.check_bytes[2] = 0xd; |
812 |
header.check_bytes[3] = 0xa; |
813 |
|
814 |
/* write all the data */
|
815 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
816 |
if (ret != sizeof(magic)) { |
817 |
ret = -errno; |
818 |
goto exit;
|
819 |
} |
820 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
821 |
if (ret != sizeof(header)) { |
822 |
ret = -errno; |
823 |
goto exit;
|
824 |
} |
825 |
|
826 |
ret = ftruncate(fd, header.grain_offset << 9);
|
827 |
if (ret < 0) { |
828 |
ret = -errno; |
829 |
goto exit;
|
830 |
} |
831 |
|
832 |
/* write grain directory */
|
833 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
834 |
for (i = 0, tmp = header.rgd_offset + gd_size; |
835 |
i < gt_count; i++, tmp += gt_size) { |
836 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
837 |
if (ret != sizeof(tmp)) { |
838 |
ret = -errno; |
839 |
goto exit;
|
840 |
} |
841 |
} |
842 |
|
843 |
/* write backup grain directory */
|
844 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
845 |
for (i = 0, tmp = header.gd_offset + gd_size; |
846 |
i < gt_count; i++, tmp += gt_size) { |
847 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
848 |
if (ret != sizeof(tmp)) { |
849 |
ret = -errno; |
850 |
goto exit;
|
851 |
} |
852 |
} |
853 |
|
854 |
/* compose the descriptor */
|
855 |
real_filename = filename; |
856 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
857 |
real_filename = temp_str + 1;
|
858 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
859 |
real_filename = temp_str + 1;
|
860 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
861 |
real_filename = temp_str + 1;
|
862 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
863 |
total_size, real_filename, |
864 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
865 |
total_size / (int64_t)(63 * 16)); |
866 |
|
867 |
/* write the descriptor */
|
868 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
869 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
870 |
if (ret != strlen(desc)) {
|
871 |
ret = -errno; |
872 |
goto exit;
|
873 |
} |
874 |
|
875 |
ret = 0;
|
876 |
exit:
|
877 |
close(fd); |
878 |
return ret;
|
879 |
} |
880 |
|
881 |
static void vmdk_close(BlockDriverState *bs) |
882 |
{ |
883 |
BDRVVmdkState *s = bs->opaque; |
884 |
|
885 |
qemu_free(s->l1_table); |
886 |
qemu_free(s->l2_cache); |
887 |
// try to close parent image, if exist
|
888 |
vmdk_parent_close(s->hd); |
889 |
bdrv_delete(s->hd); |
890 |
} |
891 |
|
892 |
static void vmdk_flush(BlockDriverState *bs) |
893 |
{ |
894 |
BDRVVmdkState *s = bs->opaque; |
895 |
bdrv_flush(s->hd); |
896 |
} |
897 |
|
898 |
|
899 |
static QEMUOptionParameter vmdk_create_options[] = {
|
900 |
{ |
901 |
.name = BLOCK_OPT_SIZE, |
902 |
.type = OPT_SIZE, |
903 |
.help = "Virtual disk size"
|
904 |
}, |
905 |
{ |
906 |
.name = BLOCK_OPT_BACKING_FILE, |
907 |
.type = OPT_STRING, |
908 |
.help = "File name of a base image"
|
909 |
}, |
910 |
{ |
911 |
.name = BLOCK_OPT_COMPAT6, |
912 |
.type = OPT_FLAG, |
913 |
.help = "VMDK version 6 image"
|
914 |
}, |
915 |
{ NULL }
|
916 |
}; |
917 |
|
918 |
static BlockDriver bdrv_vmdk = {
|
919 |
.format_name = "vmdk",
|
920 |
.instance_size = sizeof(BDRVVmdkState),
|
921 |
.bdrv_probe = vmdk_probe, |
922 |
.bdrv_open = vmdk_open, |
923 |
.bdrv_read = vmdk_read, |
924 |
.bdrv_write = vmdk_write, |
925 |
.bdrv_close = vmdk_close, |
926 |
.bdrv_create = vmdk_create, |
927 |
.bdrv_flush = vmdk_flush, |
928 |
.bdrv_is_allocated = vmdk_is_allocated, |
929 |
|
930 |
.create_options = vmdk_create_options, |
931 |
}; |
932 |
|
933 |
static void bdrv_vmdk_init(void) |
934 |
{ |
935 |
bdrv_register(&bdrv_vmdk); |
936 |
} |
937 |
|
938 |
block_init(bdrv_vmdk_init); |