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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" |
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#include "block_int.h" |
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#include "module.h" |
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|
30 |
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') |
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#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') |
32 |
|
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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; |
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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 VmdkExtent { |
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BlockDriverState *file; |
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bool flat;
|
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int64_t sectors; |
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int64_t end_sector; |
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int64_t l1_table_offset; |
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int64_t l1_backup_table_offset; |
70 |
uint32_t *l1_table; |
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uint32_t *l1_backup_table; |
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unsigned int l1_size; |
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uint32_t l1_entry_sectors; |
74 |
|
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unsigned int l2_size; |
76 |
uint32_t *l2_cache; |
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uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
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uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
79 |
|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
82 |
|
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typedef struct BDRVVmdkState { |
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int desc_offset;
|
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bool cid_updated;
|
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uint32_t parent_cid; |
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int num_extents;
|
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/* Extent array with num_extents entries, ascend ordered by address */
|
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VmdkExtent *extents; |
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} BDRVVmdkState; |
91 |
|
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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; |
99 |
|
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static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) |
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{ |
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uint32_t magic; |
103 |
|
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if (buf_size < 4) |
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return 0; |
106 |
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; |
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} else {
|
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const char *p = (const char *)buf; |
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const char *end = p + buf_size; |
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while (p < end) {
|
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if (*p == '#') { |
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/* skip comment line */
|
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while (p < end && *p != '\n') { |
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p++; |
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} |
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p++; |
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continue;
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} |
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if (*p == ' ') { |
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while (p < end && *p == ' ') { |
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p++; |
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} |
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/* skip '\r' if windows line endings used. */
|
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if (p < end && *p == '\r') { |
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p++; |
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} |
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/* only accept blank lines before 'version=' line */
|
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if (p == end || *p != '\n') { |
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return 0; |
133 |
} |
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p++; |
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continue;
|
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} |
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if (end - p >= strlen("version=X\n")) { |
138 |
if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || |
139 |
strncmp("version=2\n", p, strlen("version=2\n")) == 0) { |
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return 100; |
141 |
} |
142 |
} |
143 |
if (end - p >= strlen("version=X\r\n")) { |
144 |
if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || |
145 |
strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { |
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return 100; |
147 |
} |
148 |
} |
149 |
return 0; |
150 |
} |
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return 0; |
152 |
} |
153 |
} |
154 |
|
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#define CHECK_CID 1 |
156 |
|
157 |
#define SECTOR_SIZE 512 |
158 |
#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
159 |
#define HEADER_SIZE 512 // first sector of 512 bytes |
160 |
|
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static void vmdk_free_extents(BlockDriverState *bs) |
162 |
{ |
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int i;
|
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BDRVVmdkState *s = bs->opaque; |
165 |
|
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for (i = 0; i < s->num_extents; i++) { |
167 |
qemu_free(s->extents[i].l1_table); |
168 |
qemu_free(s->extents[i].l2_cache); |
169 |
qemu_free(s->extents[i].l1_backup_table); |
170 |
} |
171 |
qemu_free(s->extents); |
172 |
} |
173 |
|
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
175 |
{ |
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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; |
179 |
size_t cid_str_size; |
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BDRVVmdkState *s = bs->opaque; |
181 |
|
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return 0; |
184 |
} |
185 |
|
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if (parent) {
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cid_str = "parentCID";
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cid_str_size = sizeof("parentCID"); |
189 |
} else {
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cid_str = "CID";
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cid_str_size = sizeof("CID"); |
192 |
} |
193 |
|
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if ((p_name = strstr(desc,cid_str)) != NULL) { |
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p_name += cid_str_size; |
196 |
sscanf(p_name,"%x",&cid);
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} |
198 |
|
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return cid;
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} |
201 |
|
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
203 |
{ |
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char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
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char *p_name, *tmp_str;
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BDRVVmdkState *s = bs->opaque; |
207 |
|
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memset(desc, 0, sizeof(desc)); |
209 |
if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return -EIO;
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} |
212 |
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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) { |
216 |
p_name += sizeof("CID"); |
217 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
218 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
219 |
} |
220 |
|
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if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) { |
222 |
return -EIO;
|
223 |
} |
224 |
return 0; |
225 |
} |
226 |
|
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static int vmdk_is_cid_valid(BlockDriverState *bs) |
228 |
{ |
229 |
#ifdef CHECK_CID
|
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BDRVVmdkState *s = bs->opaque; |
231 |
BlockDriverState *p_bs = bs->backing_hd; |
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uint32_t cur_pcid; |
233 |
|
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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; |
239 |
} |
240 |
#endif
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// CID valid
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return 1; |
243 |
} |
244 |
|
245 |
static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
246 |
{ |
247 |
int snp_fd, p_fd;
|
248 |
int ret;
|
249 |
uint32_t p_cid; |
250 |
char *p_name, *gd_buf, *rgd_buf;
|
251 |
const char *real_filename, *temp_str; |
252 |
VMDK4Header header; |
253 |
uint32_t gde_entries, gd_size; |
254 |
int64_t gd_offset, rgd_offset, capacity, gt_size; |
255 |
char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
|
256 |
static const char desc_template[] = |
257 |
"# 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";
|
270 |
|
271 |
snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
|
272 |
if (snp_fd < 0) |
273 |
return -errno;
|
274 |
p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
275 |
if (p_fd < 0) { |
276 |
close(snp_fd); |
277 |
return -errno;
|
278 |
} |
279 |
|
280 |
/* read the header */
|
281 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
282 |
ret = -errno; |
283 |
goto fail;
|
284 |
} |
285 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
|
286 |
ret = -errno; |
287 |
goto fail;
|
288 |
} |
289 |
|
290 |
/* write the header */
|
291 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
292 |
ret = -errno; |
293 |
goto fail;
|
294 |
} |
295 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) { |
296 |
ret = -errno; |
297 |
goto fail;
|
298 |
} |
299 |
|
300 |
memset(&header, 0, sizeof(header)); |
301 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
302 |
|
303 |
if (ftruncate(snp_fd, header.grain_offset << 9)) { |
304 |
ret = -errno; |
305 |
goto fail;
|
306 |
} |
307 |
/* the descriptor offset = 0x200 */
|
308 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
309 |
ret = -errno; |
310 |
goto fail;
|
311 |
} |
312 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
313 |
ret = -errno; |
314 |
goto fail;
|
315 |
} |
316 |
|
317 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
318 |
p_name += sizeof("CID"); |
319 |
sscanf(p_name,"%x",&p_cid);
|
320 |
} |
321 |
|
322 |
real_filename = filename; |
323 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
324 |
real_filename = temp_str + 1;
|
325 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
326 |
real_filename = temp_str + 1;
|
327 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
328 |
real_filename = temp_str + 1;
|
329 |
|
330 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
|
331 |
(uint32_t)header.capacity, real_filename); |
332 |
|
333 |
/* write the descriptor */
|
334 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
335 |
ret = -errno; |
336 |
goto fail;
|
337 |
} |
338 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { |
339 |
ret = -errno; |
340 |
goto fail;
|
341 |
} |
342 |
|
343 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
344 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
345 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
346 |
/*
|
347 |
* Each GDE span 32M disk, means:
|
348 |
* 512 GTE per GT, each GTE points to grain
|
349 |
*/
|
350 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
351 |
if (!gt_size) {
|
352 |
ret = -EINVAL; |
353 |
goto fail;
|
354 |
} |
355 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
356 |
gd_size = gde_entries * sizeof(uint32_t);
|
357 |
|
358 |
/* write RGD */
|
359 |
rgd_buf = qemu_malloc(gd_size); |
360 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
361 |
ret = -errno; |
362 |
goto fail_rgd;
|
363 |
} |
364 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
365 |
ret = -errno; |
366 |
goto fail_rgd;
|
367 |
} |
368 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { |
369 |
ret = -errno; |
370 |
goto fail_rgd;
|
371 |
} |
372 |
if (write(snp_fd, rgd_buf, gd_size) == -1) { |
373 |
ret = -errno; |
374 |
goto fail_rgd;
|
375 |
} |
376 |
|
377 |
/* write GD */
|
378 |
gd_buf = qemu_malloc(gd_size); |
379 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
380 |
ret = -errno; |
381 |
goto fail_gd;
|
382 |
} |
383 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
384 |
ret = -errno; |
385 |
goto fail_gd;
|
386 |
} |
387 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { |
388 |
ret = -errno; |
389 |
goto fail_gd;
|
390 |
} |
391 |
if (write(snp_fd, gd_buf, gd_size) == -1) { |
392 |
ret = -errno; |
393 |
goto fail_gd;
|
394 |
} |
395 |
ret = 0;
|
396 |
|
397 |
fail_gd:
|
398 |
qemu_free(gd_buf); |
399 |
fail_rgd:
|
400 |
qemu_free(rgd_buf); |
401 |
fail:
|
402 |
close(p_fd); |
403 |
close(snp_fd); |
404 |
return ret;
|
405 |
} |
406 |
|
407 |
static int vmdk_parent_open(BlockDriverState *bs) |
408 |
{ |
409 |
char *p_name;
|
410 |
char desc[DESC_SIZE];
|
411 |
BDRVVmdkState *s = bs->opaque; |
412 |
|
413 |
if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
|
414 |
return -1; |
415 |
} |
416 |
|
417 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
418 |
char *end_name;
|
419 |
|
420 |
p_name += sizeof("parentFileNameHint") + 1; |
421 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
422 |
return -1; |
423 |
if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
424 |
return -1; |
425 |
|
426 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
427 |
} |
428 |
|
429 |
return 0; |
430 |
} |
431 |
|
432 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
433 |
* address. return NULL if allocation failed. */
|
434 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
435 |
BlockDriverState *file, bool flat, int64_t sectors,
|
436 |
int64_t l1_offset, int64_t l1_backup_offset, |
437 |
uint32_t l1_size, |
438 |
int l2_size, unsigned int cluster_sectors) |
439 |
{ |
440 |
VmdkExtent *extent; |
441 |
BDRVVmdkState *s = bs->opaque; |
442 |
|
443 |
s->extents = qemu_realloc(s->extents, |
444 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
445 |
extent = &s->extents[s->num_extents]; |
446 |
s->num_extents++; |
447 |
|
448 |
memset(extent, 0, sizeof(VmdkExtent)); |
449 |
extent->file = file; |
450 |
extent->flat = flat; |
451 |
extent->sectors = sectors; |
452 |
extent->l1_table_offset = l1_offset; |
453 |
extent->l1_backup_table_offset = l1_backup_offset; |
454 |
extent->l1_size = l1_size; |
455 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
456 |
extent->l2_size = l2_size; |
457 |
extent->cluster_sectors = cluster_sectors; |
458 |
|
459 |
if (s->num_extents > 1) { |
460 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
461 |
} else {
|
462 |
extent->end_sector = extent->sectors; |
463 |
} |
464 |
bs->total_sectors = extent->end_sector; |
465 |
return extent;
|
466 |
} |
467 |
|
468 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
469 |
{ |
470 |
int ret;
|
471 |
int l1_size, i;
|
472 |
|
473 |
/* read the L1 table */
|
474 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
475 |
extent->l1_table = qemu_malloc(l1_size); |
476 |
ret = bdrv_pread(extent->file, |
477 |
extent->l1_table_offset, |
478 |
extent->l1_table, |
479 |
l1_size); |
480 |
if (ret < 0) { |
481 |
goto fail_l1;
|
482 |
} |
483 |
for (i = 0; i < extent->l1_size; i++) { |
484 |
le32_to_cpus(&extent->l1_table[i]); |
485 |
} |
486 |
|
487 |
if (extent->l1_backup_table_offset) {
|
488 |
extent->l1_backup_table = qemu_malloc(l1_size); |
489 |
ret = bdrv_pread(extent->file, |
490 |
extent->l1_backup_table_offset, |
491 |
extent->l1_backup_table, |
492 |
l1_size); |
493 |
if (ret < 0) { |
494 |
goto fail_l1b;
|
495 |
} |
496 |
for (i = 0; i < extent->l1_size; i++) { |
497 |
le32_to_cpus(&extent->l1_backup_table[i]); |
498 |
} |
499 |
} |
500 |
|
501 |
extent->l2_cache = |
502 |
qemu_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
503 |
return 0; |
504 |
fail_l1b:
|
505 |
qemu_free(extent->l1_backup_table); |
506 |
fail_l1:
|
507 |
qemu_free(extent->l1_table); |
508 |
return ret;
|
509 |
} |
510 |
|
511 |
static int vmdk_open_vmdk3(BlockDriverState *bs, int flags) |
512 |
{ |
513 |
int ret;
|
514 |
uint32_t magic; |
515 |
VMDK3Header header; |
516 |
BDRVVmdkState *s = bs->opaque; |
517 |
VmdkExtent *extent; |
518 |
|
519 |
s->desc_offset = 0x200;
|
520 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
521 |
if (ret < 0) { |
522 |
goto fail;
|
523 |
} |
524 |
extent = vmdk_add_extent(bs, |
525 |
bs->file, false,
|
526 |
le32_to_cpu(header.disk_sectors), |
527 |
le32_to_cpu(header.l1dir_offset) << 9,
|
528 |
0, 1 << 6, 1 << 9, |
529 |
le32_to_cpu(header.granularity)); |
530 |
ret = vmdk_init_tables(bs, extent); |
531 |
if (ret) {
|
532 |
/* vmdk_init_tables cleans up on fail, so only free allocation of
|
533 |
* vmdk_add_extent here. */
|
534 |
goto fail;
|
535 |
} |
536 |
return 0; |
537 |
fail:
|
538 |
vmdk_free_extents(bs); |
539 |
return ret;
|
540 |
} |
541 |
|
542 |
static int vmdk_open_vmdk4(BlockDriverState *bs, int flags) |
543 |
{ |
544 |
int ret;
|
545 |
uint32_t magic; |
546 |
uint32_t l1_size, l1_entry_sectors; |
547 |
VMDK4Header header; |
548 |
BDRVVmdkState *s = bs->opaque; |
549 |
VmdkExtent *extent; |
550 |
|
551 |
s->desc_offset = 0x200;
|
552 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
553 |
if (ret < 0) { |
554 |
goto fail;
|
555 |
} |
556 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
557 |
* le64_to_cpu(header.granularity); |
558 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
559 |
/ l1_entry_sectors; |
560 |
extent = vmdk_add_extent(bs, bs->file, false,
|
561 |
le64_to_cpu(header.capacity), |
562 |
le64_to_cpu(header.gd_offset) << 9,
|
563 |
le64_to_cpu(header.rgd_offset) << 9,
|
564 |
l1_size, |
565 |
le32_to_cpu(header.num_gtes_per_gte), |
566 |
le64_to_cpu(header.granularity)); |
567 |
if (extent->l1_entry_sectors <= 0) { |
568 |
ret = -EINVAL; |
569 |
goto fail;
|
570 |
} |
571 |
/* try to open parent images, if exist */
|
572 |
ret = vmdk_parent_open(bs); |
573 |
if (ret) {
|
574 |
goto fail;
|
575 |
} |
576 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
577 |
ret = vmdk_init_tables(bs, extent); |
578 |
if (ret) {
|
579 |
goto fail;
|
580 |
} |
581 |
return 0; |
582 |
fail:
|
583 |
vmdk_free_extents(bs); |
584 |
return ret;
|
585 |
} |
586 |
|
587 |
static int vmdk_open(BlockDriverState *bs, int flags) |
588 |
{ |
589 |
uint32_t magic; |
590 |
|
591 |
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
592 |
return -EIO;
|
593 |
} |
594 |
|
595 |
magic = be32_to_cpu(magic); |
596 |
if (magic == VMDK3_MAGIC) {
|
597 |
return vmdk_open_vmdk3(bs, flags);
|
598 |
} else if (magic == VMDK4_MAGIC) { |
599 |
return vmdk_open_vmdk4(bs, flags);
|
600 |
} else {
|
601 |
return -EINVAL;
|
602 |
} |
603 |
} |
604 |
|
605 |
static int get_whole_cluster(BlockDriverState *bs, |
606 |
VmdkExtent *extent, |
607 |
uint64_t cluster_offset, |
608 |
uint64_t offset, |
609 |
bool allocate)
|
610 |
{ |
611 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
612 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
613 |
|
614 |
/* we will be here if it's first write on non-exist grain(cluster).
|
615 |
* try to read from parent image, if exist */
|
616 |
if (bs->backing_hd) {
|
617 |
int ret;
|
618 |
|
619 |
if (!vmdk_is_cid_valid(bs))
|
620 |
return -1; |
621 |
|
622 |
/* floor offset to cluster */
|
623 |
offset -= offset % (extent->cluster_sectors * 512);
|
624 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
625 |
extent->cluster_sectors); |
626 |
if (ret < 0) { |
627 |
return -1; |
628 |
} |
629 |
|
630 |
/* Write grain only into the active image */
|
631 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
632 |
extent->cluster_sectors); |
633 |
if (ret < 0) { |
634 |
return -1; |
635 |
} |
636 |
} |
637 |
return 0; |
638 |
} |
639 |
|
640 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
641 |
{ |
642 |
/* update L2 table */
|
643 |
if (bdrv_pwrite_sync(
|
644 |
extent->file, |
645 |
((int64_t)m_data->l2_offset * 512)
|
646 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
647 |
&(m_data->offset), |
648 |
sizeof(m_data->offset)
|
649 |
) < 0) {
|
650 |
return -1; |
651 |
} |
652 |
/* update backup L2 table */
|
653 |
if (extent->l1_backup_table_offset != 0) { |
654 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
655 |
if (bdrv_pwrite_sync(
|
656 |
extent->file, |
657 |
((int64_t)m_data->l2_offset * 512)
|
658 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
659 |
&(m_data->offset), sizeof(m_data->offset)
|
660 |
) < 0) {
|
661 |
return -1; |
662 |
} |
663 |
} |
664 |
|
665 |
return 0; |
666 |
} |
667 |
|
668 |
static int get_cluster_offset(BlockDriverState *bs, |
669 |
VmdkExtent *extent, |
670 |
VmdkMetaData *m_data, |
671 |
uint64_t offset, |
672 |
int allocate,
|
673 |
uint64_t *cluster_offset) |
674 |
{ |
675 |
unsigned int l1_index, l2_offset, l2_index; |
676 |
int min_index, i, j;
|
677 |
uint32_t min_count, *l2_table, tmp = 0;
|
678 |
|
679 |
if (m_data)
|
680 |
m_data->valid = 0;
|
681 |
if (extent->flat) {
|
682 |
*cluster_offset = 0;
|
683 |
return 0; |
684 |
} |
685 |
|
686 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
687 |
if (l1_index >= extent->l1_size) {
|
688 |
return -1; |
689 |
} |
690 |
l2_offset = extent->l1_table[l1_index]; |
691 |
if (!l2_offset) {
|
692 |
return -1; |
693 |
} |
694 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
695 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
696 |
/* increment the hit count */
|
697 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
698 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
699 |
extent->l2_cache_counts[j] >>= 1;
|
700 |
} |
701 |
} |
702 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
703 |
goto found;
|
704 |
} |
705 |
} |
706 |
/* not found: load a new entry in the least used one */
|
707 |
min_index = 0;
|
708 |
min_count = 0xffffffff;
|
709 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
710 |
if (extent->l2_cache_counts[i] < min_count) {
|
711 |
min_count = extent->l2_cache_counts[i]; |
712 |
min_index = i; |
713 |
} |
714 |
} |
715 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
716 |
if (bdrv_pread(
|
717 |
extent->file, |
718 |
(int64_t)l2_offset * 512,
|
719 |
l2_table, |
720 |
extent->l2_size * sizeof(uint32_t)
|
721 |
) != extent->l2_size * sizeof(uint32_t)) {
|
722 |
return -1; |
723 |
} |
724 |
|
725 |
extent->l2_cache_offsets[min_index] = l2_offset; |
726 |
extent->l2_cache_counts[min_index] = 1;
|
727 |
found:
|
728 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
729 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
730 |
|
731 |
if (!*cluster_offset) {
|
732 |
if (!allocate) {
|
733 |
return -1; |
734 |
} |
735 |
|
736 |
// Avoid the L2 tables update for the images that have snapshots.
|
737 |
*cluster_offset = bdrv_getlength(extent->file); |
738 |
bdrv_truncate( |
739 |
extent->file, |
740 |
*cluster_offset + (extent->cluster_sectors << 9)
|
741 |
); |
742 |
|
743 |
*cluster_offset >>= 9;
|
744 |
tmp = cpu_to_le32(*cluster_offset); |
745 |
l2_table[l2_index] = tmp; |
746 |
|
747 |
/* First of all we write grain itself, to avoid race condition
|
748 |
* that may to corrupt the image.
|
749 |
* This problem may occur because of insufficient space on host disk
|
750 |
* or inappropriate VM shutdown.
|
751 |
*/
|
752 |
if (get_whole_cluster(
|
753 |
bs, extent, *cluster_offset, offset, allocate) == -1)
|
754 |
return -1; |
755 |
|
756 |
if (m_data) {
|
757 |
m_data->offset = tmp; |
758 |
m_data->l1_index = l1_index; |
759 |
m_data->l2_index = l2_index; |
760 |
m_data->l2_offset = l2_offset; |
761 |
m_data->valid = 1;
|
762 |
} |
763 |
} |
764 |
*cluster_offset <<= 9;
|
765 |
return 0; |
766 |
} |
767 |
|
768 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
769 |
int64_t sector_num, VmdkExtent *start_hint) |
770 |
{ |
771 |
VmdkExtent *extent = start_hint; |
772 |
|
773 |
if (!extent) {
|
774 |
extent = &s->extents[0];
|
775 |
} |
776 |
while (extent < &s->extents[s->num_extents]) {
|
777 |
if (sector_num < extent->end_sector) {
|
778 |
return extent;
|
779 |
} |
780 |
extent++; |
781 |
} |
782 |
return NULL; |
783 |
} |
784 |
|
785 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
786 |
int nb_sectors, int *pnum) |
787 |
{ |
788 |
BDRVVmdkState *s = bs->opaque; |
789 |
int64_t index_in_cluster, n, ret; |
790 |
uint64_t offset; |
791 |
VmdkExtent *extent; |
792 |
|
793 |
extent = find_extent(s, sector_num, NULL);
|
794 |
if (!extent) {
|
795 |
return 0; |
796 |
} |
797 |
ret = get_cluster_offset(bs, extent, NULL,
|
798 |
sector_num * 512, 0, &offset); |
799 |
/* get_cluster_offset returning 0 means success */
|
800 |
ret = !ret; |
801 |
|
802 |
index_in_cluster = sector_num % extent->cluster_sectors; |
803 |
n = extent->cluster_sectors - index_in_cluster; |
804 |
if (n > nb_sectors)
|
805 |
n = nb_sectors; |
806 |
*pnum = n; |
807 |
return ret;
|
808 |
} |
809 |
|
810 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
811 |
uint8_t *buf, int nb_sectors)
|
812 |
{ |
813 |
BDRVVmdkState *s = bs->opaque; |
814 |
int ret;
|
815 |
uint64_t n, index_in_cluster; |
816 |
VmdkExtent *extent = NULL;
|
817 |
uint64_t cluster_offset; |
818 |
|
819 |
while (nb_sectors > 0) { |
820 |
extent = find_extent(s, sector_num, extent); |
821 |
if (!extent) {
|
822 |
return -EIO;
|
823 |
} |
824 |
ret = get_cluster_offset( |
825 |
bs, extent, NULL,
|
826 |
sector_num << 9, 0, &cluster_offset); |
827 |
index_in_cluster = sector_num % extent->cluster_sectors; |
828 |
n = extent->cluster_sectors - index_in_cluster; |
829 |
if (n > nb_sectors)
|
830 |
n = nb_sectors; |
831 |
if (ret) {
|
832 |
/* if not allocated, try to read from parent image, if exist */
|
833 |
if (bs->backing_hd) {
|
834 |
if (!vmdk_is_cid_valid(bs))
|
835 |
return -1; |
836 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
837 |
if (ret < 0) |
838 |
return -1; |
839 |
} else {
|
840 |
memset(buf, 0, 512 * n); |
841 |
} |
842 |
} else {
|
843 |
if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
844 |
return -1; |
845 |
} |
846 |
nb_sectors -= n; |
847 |
sector_num += n; |
848 |
buf += n * 512;
|
849 |
} |
850 |
return 0; |
851 |
} |
852 |
|
853 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
854 |
const uint8_t *buf, int nb_sectors) |
855 |
{ |
856 |
BDRVVmdkState *s = bs->opaque; |
857 |
VmdkExtent *extent = NULL;
|
858 |
int n, ret;
|
859 |
int64_t index_in_cluster; |
860 |
uint64_t cluster_offset; |
861 |
VmdkMetaData m_data; |
862 |
|
863 |
if (sector_num > bs->total_sectors) {
|
864 |
fprintf(stderr, |
865 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
866 |
" total_sectors=0x%" PRIx64 "\n", |
867 |
sector_num, bs->total_sectors); |
868 |
return -1; |
869 |
} |
870 |
|
871 |
while (nb_sectors > 0) { |
872 |
extent = find_extent(s, sector_num, extent); |
873 |
if (!extent) {
|
874 |
return -EIO;
|
875 |
} |
876 |
ret = get_cluster_offset( |
877 |
bs, |
878 |
extent, |
879 |
&m_data, |
880 |
sector_num << 9, 1, |
881 |
&cluster_offset); |
882 |
if (ret) {
|
883 |
return -EINVAL;
|
884 |
} |
885 |
index_in_cluster = sector_num % extent->cluster_sectors; |
886 |
n = extent->cluster_sectors - index_in_cluster; |
887 |
if (n > nb_sectors) {
|
888 |
n = nb_sectors; |
889 |
} |
890 |
|
891 |
if (bdrv_pwrite(bs->file,
|
892 |
cluster_offset + index_in_cluster * 512,
|
893 |
buf, n * 512)
|
894 |
!= n * 512) {
|
895 |
return -1; |
896 |
} |
897 |
if (m_data.valid) {
|
898 |
/* update L2 tables */
|
899 |
if (vmdk_L2update(extent, &m_data) == -1) { |
900 |
return -1; |
901 |
} |
902 |
} |
903 |
nb_sectors -= n; |
904 |
sector_num += n; |
905 |
buf += n * 512;
|
906 |
|
907 |
// update CID on the first write every time the virtual disk is opened
|
908 |
if (!s->cid_updated) {
|
909 |
vmdk_write_cid(bs, time(NULL));
|
910 |
s->cid_updated = true;
|
911 |
} |
912 |
} |
913 |
return 0; |
914 |
} |
915 |
|
916 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
917 |
{ |
918 |
int fd, i;
|
919 |
VMDK4Header header; |
920 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
921 |
static const char desc_template[] = |
922 |
"# Disk DescriptorFile\n"
|
923 |
"version=1\n"
|
924 |
"CID=%x\n"
|
925 |
"parentCID=ffffffff\n"
|
926 |
"createType=\"monolithicSparse\"\n"
|
927 |
"\n"
|
928 |
"# Extent description\n"
|
929 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
930 |
"\n"
|
931 |
"# The Disk Data Base \n"
|
932 |
"#DDB\n"
|
933 |
"\n"
|
934 |
"ddb.virtualHWVersion = \"%d\"\n"
|
935 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
936 |
"ddb.geometry.heads = \"16\"\n"
|
937 |
"ddb.geometry.sectors = \"63\"\n"
|
938 |
"ddb.adapterType = \"ide\"\n";
|
939 |
char desc[1024]; |
940 |
const char *real_filename, *temp_str; |
941 |
int64_t total_size = 0;
|
942 |
const char *backing_file = NULL; |
943 |
int flags = 0; |
944 |
int ret;
|
945 |
|
946 |
// Read out options
|
947 |
while (options && options->name) {
|
948 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
949 |
total_size = options->value.n / 512;
|
950 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
951 |
backing_file = options->value.s; |
952 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
953 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
954 |
} |
955 |
options++; |
956 |
} |
957 |
|
958 |
/* XXX: add support for backing file */
|
959 |
if (backing_file) {
|
960 |
return vmdk_snapshot_create(filename, backing_file);
|
961 |
} |
962 |
|
963 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
964 |
0644);
|
965 |
if (fd < 0) |
966 |
return -errno;
|
967 |
magic = cpu_to_be32(VMDK4_MAGIC); |
968 |
memset(&header, 0, sizeof(header)); |
969 |
header.version = 1;
|
970 |
header.flags = 3; /* ?? */ |
971 |
header.capacity = total_size; |
972 |
header.granularity = 128;
|
973 |
header.num_gtes_per_gte = 512;
|
974 |
|
975 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
976 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
977 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
978 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
979 |
|
980 |
header.desc_offset = 1;
|
981 |
header.desc_size = 20;
|
982 |
header.rgd_offset = header.desc_offset + header.desc_size; |
983 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
984 |
header.grain_offset = |
985 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
986 |
header.granularity - 1) / header.granularity) *
|
987 |
header.granularity; |
988 |
|
989 |
/* swap endianness for all header fields */
|
990 |
header.version = cpu_to_le32(header.version); |
991 |
header.flags = cpu_to_le32(header.flags); |
992 |
header.capacity = cpu_to_le64(header.capacity); |
993 |
header.granularity = cpu_to_le64(header.granularity); |
994 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
995 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
996 |
header.desc_size = cpu_to_le64(header.desc_size); |
997 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
998 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
999 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
1000 |
|
1001 |
header.check_bytes[0] = 0xa; |
1002 |
header.check_bytes[1] = 0x20; |
1003 |
header.check_bytes[2] = 0xd; |
1004 |
header.check_bytes[3] = 0xa; |
1005 |
|
1006 |
/* write all the data */
|
1007 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
1008 |
if (ret != sizeof(magic)) { |
1009 |
ret = -errno; |
1010 |
goto exit;
|
1011 |
} |
1012 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
1013 |
if (ret != sizeof(header)) { |
1014 |
ret = -errno; |
1015 |
goto exit;
|
1016 |
} |
1017 |
|
1018 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
1019 |
if (ret < 0) { |
1020 |
ret = -errno; |
1021 |
goto exit;
|
1022 |
} |
1023 |
|
1024 |
/* write grain directory */
|
1025 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
1026 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
1027 |
i < gt_count; i++, tmp += gt_size) { |
1028 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1029 |
if (ret != sizeof(tmp)) { |
1030 |
ret = -errno; |
1031 |
goto exit;
|
1032 |
} |
1033 |
} |
1034 |
|
1035 |
/* write backup grain directory */
|
1036 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1037 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1038 |
i < gt_count; i++, tmp += gt_size) { |
1039 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1040 |
if (ret != sizeof(tmp)) { |
1041 |
ret = -errno; |
1042 |
goto exit;
|
1043 |
} |
1044 |
} |
1045 |
|
1046 |
/* compose the descriptor */
|
1047 |
real_filename = filename; |
1048 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
1049 |
real_filename = temp_str + 1;
|
1050 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
1051 |
real_filename = temp_str + 1;
|
1052 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
1053 |
real_filename = temp_str + 1;
|
1054 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
1055 |
total_size, real_filename, |
1056 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1057 |
total_size / (int64_t)(63 * 16)); |
1058 |
|
1059 |
/* write the descriptor */
|
1060 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
1061 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1062 |
if (ret != strlen(desc)) {
|
1063 |
ret = -errno; |
1064 |
goto exit;
|
1065 |
} |
1066 |
|
1067 |
ret = 0;
|
1068 |
exit:
|
1069 |
close(fd); |
1070 |
return ret;
|
1071 |
} |
1072 |
|
1073 |
static void vmdk_close(BlockDriverState *bs) |
1074 |
{ |
1075 |
vmdk_free_extents(bs); |
1076 |
} |
1077 |
|
1078 |
static int vmdk_flush(BlockDriverState *bs) |
1079 |
{ |
1080 |
int i, ret, err;
|
1081 |
BDRVVmdkState *s = bs->opaque; |
1082 |
|
1083 |
ret = bdrv_flush(bs->file); |
1084 |
for (i = 0; i < s->num_extents; i++) { |
1085 |
err = bdrv_flush(s->extents[i].file); |
1086 |
if (err < 0) { |
1087 |
ret = err; |
1088 |
} |
1089 |
} |
1090 |
return ret;
|
1091 |
} |
1092 |
|
1093 |
|
1094 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1095 |
{ |
1096 |
.name = BLOCK_OPT_SIZE, |
1097 |
.type = OPT_SIZE, |
1098 |
.help = "Virtual disk size"
|
1099 |
}, |
1100 |
{ |
1101 |
.name = BLOCK_OPT_BACKING_FILE, |
1102 |
.type = OPT_STRING, |
1103 |
.help = "File name of a base image"
|
1104 |
}, |
1105 |
{ |
1106 |
.name = BLOCK_OPT_COMPAT6, |
1107 |
.type = OPT_FLAG, |
1108 |
.help = "VMDK version 6 image"
|
1109 |
}, |
1110 |
{ NULL }
|
1111 |
}; |
1112 |
|
1113 |
static BlockDriver bdrv_vmdk = {
|
1114 |
.format_name = "vmdk",
|
1115 |
.instance_size = sizeof(BDRVVmdkState),
|
1116 |
.bdrv_probe = vmdk_probe, |
1117 |
.bdrv_open = vmdk_open, |
1118 |
.bdrv_read = vmdk_read, |
1119 |
.bdrv_write = vmdk_write, |
1120 |
.bdrv_close = vmdk_close, |
1121 |
.bdrv_create = vmdk_create, |
1122 |
.bdrv_flush = vmdk_flush, |
1123 |
.bdrv_is_allocated = vmdk_is_allocated, |
1124 |
|
1125 |
.create_options = vmdk_create_options, |
1126 |
}; |
1127 |
|
1128 |
static void bdrv_vmdk_init(void) |
1129 |
{ |
1130 |
bdrv_register(&bdrv_vmdk); |
1131 |
} |
1132 |
|
1133 |
block_init(bdrv_vmdk_init); |