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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') |
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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; |
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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; |
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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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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; |
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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 |
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|
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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 flat_start_offset; |
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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; |
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uint32_t l1_entry_sectors; |
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|
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unsigned int l2_size; |
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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]; |
80 |
|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
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|
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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; |
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|
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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; |
100 |
|
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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; |
104 |
|
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if (buf_size < 4) { |
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return 0; |
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} |
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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; |
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} |
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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")) { |
140 |
if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || |
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strncmp("version=2\n", p, strlen("version=2\n")) == 0) { |
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return 100; |
143 |
} |
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} |
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if (end - p >= strlen("version=X\r\n")) { |
146 |
if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || |
147 |
strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { |
148 |
return 100; |
149 |
} |
150 |
} |
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return 0; |
152 |
} |
153 |
return 0; |
154 |
} |
155 |
} |
156 |
|
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#define CHECK_CID 1 |
158 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ |
161 |
#define BUF_SIZE 4096 |
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#define HEADER_SIZE 512 /* first sector of 512 bytes */ |
163 |
|
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static void vmdk_free_extents(BlockDriverState *bs) |
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{ |
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int i;
|
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BDRVVmdkState *s = bs->opaque; |
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|
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for (i = 0; i < s->num_extents; i++) { |
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qemu_free(s->extents[i].l1_table); |
171 |
qemu_free(s->extents[i].l2_cache); |
172 |
qemu_free(s->extents[i].l1_backup_table); |
173 |
} |
174 |
qemu_free(s->extents); |
175 |
} |
176 |
|
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
178 |
{ |
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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; |
182 |
size_t cid_str_size; |
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BDRVVmdkState *s = bs->opaque; |
184 |
|
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return 0; |
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} |
188 |
|
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if (parent) {
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cid_str = "parentCID";
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cid_str_size = sizeof("parentCID"); |
192 |
} else {
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cid_str = "CID";
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cid_str_size = sizeof("CID"); |
195 |
} |
196 |
|
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p_name = strstr(desc, cid_str); |
198 |
if (p_name != NULL) { |
199 |
p_name += cid_str_size; |
200 |
sscanf(p_name, "%x", &cid);
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} |
202 |
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return cid;
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} |
205 |
|
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
207 |
{ |
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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; |
211 |
|
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memset(desc, 0, sizeof(desc)); |
213 |
if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return -EIO;
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} |
216 |
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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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p_name = strstr(desc, "CID");
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if (p_name != NULL) { |
221 |
p_name += sizeof("CID"); |
222 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
223 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
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} |
225 |
|
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if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) { |
227 |
return -EIO;
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} |
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return 0; |
230 |
} |
231 |
|
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static int vmdk_is_cid_valid(BlockDriverState *bs) |
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{ |
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#ifdef CHECK_CID
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BDRVVmdkState *s = bs->opaque; |
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BlockDriverState *p_bs = bs->backing_hd; |
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uint32_t cur_pcid; |
238 |
|
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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; |
244 |
} |
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} |
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#endif
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/* CID valid */
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return 1; |
249 |
} |
250 |
|
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static int vmdk_parent_open(BlockDriverState *bs) |
252 |
{ |
253 |
char *p_name;
|
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char desc[DESC_SIZE + 1]; |
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BDRVVmdkState *s = bs->opaque; |
256 |
|
257 |
desc[DESC_SIZE] = '\0';
|
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
|
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return -1; |
260 |
} |
261 |
|
262 |
p_name = strstr(desc, "parentFileNameHint");
|
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if (p_name != NULL) { |
264 |
char *end_name;
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265 |
|
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p_name += sizeof("parentFileNameHint") + 1; |
267 |
end_name = strchr(p_name, '\"');
|
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if (end_name == NULL) { |
269 |
return -1; |
270 |
} |
271 |
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { |
272 |
return -1; |
273 |
} |
274 |
|
275 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
276 |
} |
277 |
|
278 |
return 0; |
279 |
} |
280 |
|
281 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
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* address. return NULL if allocation failed. */
|
283 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
284 |
BlockDriverState *file, bool flat, int64_t sectors,
|
285 |
int64_t l1_offset, int64_t l1_backup_offset, |
286 |
uint32_t l1_size, |
287 |
int l2_size, unsigned int cluster_sectors) |
288 |
{ |
289 |
VmdkExtent *extent; |
290 |
BDRVVmdkState *s = bs->opaque; |
291 |
|
292 |
s->extents = qemu_realloc(s->extents, |
293 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
294 |
extent = &s->extents[s->num_extents]; |
295 |
s->num_extents++; |
296 |
|
297 |
memset(extent, 0, sizeof(VmdkExtent)); |
298 |
extent->file = file; |
299 |
extent->flat = flat; |
300 |
extent->sectors = sectors; |
301 |
extent->l1_table_offset = l1_offset; |
302 |
extent->l1_backup_table_offset = l1_backup_offset; |
303 |
extent->l1_size = l1_size; |
304 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
305 |
extent->l2_size = l2_size; |
306 |
extent->cluster_sectors = cluster_sectors; |
307 |
|
308 |
if (s->num_extents > 1) { |
309 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
310 |
} else {
|
311 |
extent->end_sector = extent->sectors; |
312 |
} |
313 |
bs->total_sectors = extent->end_sector; |
314 |
return extent;
|
315 |
} |
316 |
|
317 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
318 |
{ |
319 |
int ret;
|
320 |
int l1_size, i;
|
321 |
|
322 |
/* read the L1 table */
|
323 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
324 |
extent->l1_table = qemu_malloc(l1_size); |
325 |
ret = bdrv_pread(extent->file, |
326 |
extent->l1_table_offset, |
327 |
extent->l1_table, |
328 |
l1_size); |
329 |
if (ret < 0) { |
330 |
goto fail_l1;
|
331 |
} |
332 |
for (i = 0; i < extent->l1_size; i++) { |
333 |
le32_to_cpus(&extent->l1_table[i]); |
334 |
} |
335 |
|
336 |
if (extent->l1_backup_table_offset) {
|
337 |
extent->l1_backup_table = qemu_malloc(l1_size); |
338 |
ret = bdrv_pread(extent->file, |
339 |
extent->l1_backup_table_offset, |
340 |
extent->l1_backup_table, |
341 |
l1_size); |
342 |
if (ret < 0) { |
343 |
goto fail_l1b;
|
344 |
} |
345 |
for (i = 0; i < extent->l1_size; i++) { |
346 |
le32_to_cpus(&extent->l1_backup_table[i]); |
347 |
} |
348 |
} |
349 |
|
350 |
extent->l2_cache = |
351 |
qemu_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
352 |
return 0; |
353 |
fail_l1b:
|
354 |
qemu_free(extent->l1_backup_table); |
355 |
fail_l1:
|
356 |
qemu_free(extent->l1_table); |
357 |
return ret;
|
358 |
} |
359 |
|
360 |
static int vmdk_open_vmdk3(BlockDriverState *bs, int flags) |
361 |
{ |
362 |
int ret;
|
363 |
uint32_t magic; |
364 |
VMDK3Header header; |
365 |
BDRVVmdkState *s = bs->opaque; |
366 |
VmdkExtent *extent; |
367 |
|
368 |
s->desc_offset = 0x200;
|
369 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
370 |
if (ret < 0) { |
371 |
goto fail;
|
372 |
} |
373 |
extent = vmdk_add_extent(bs, |
374 |
bs->file, false,
|
375 |
le32_to_cpu(header.disk_sectors), |
376 |
le32_to_cpu(header.l1dir_offset) << 9,
|
377 |
0, 1 << 6, 1 << 9, |
378 |
le32_to_cpu(header.granularity)); |
379 |
ret = vmdk_init_tables(bs, extent); |
380 |
if (ret) {
|
381 |
/* vmdk_init_tables cleans up on fail, so only free allocation of
|
382 |
* vmdk_add_extent here. */
|
383 |
goto fail;
|
384 |
} |
385 |
return 0; |
386 |
fail:
|
387 |
vmdk_free_extents(bs); |
388 |
return ret;
|
389 |
} |
390 |
|
391 |
static int vmdk_open_vmdk4(BlockDriverState *bs, int flags) |
392 |
{ |
393 |
int ret;
|
394 |
uint32_t magic; |
395 |
uint32_t l1_size, l1_entry_sectors; |
396 |
VMDK4Header header; |
397 |
BDRVVmdkState *s = bs->opaque; |
398 |
VmdkExtent *extent; |
399 |
|
400 |
s->desc_offset = 0x200;
|
401 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
402 |
if (ret < 0) { |
403 |
goto fail;
|
404 |
} |
405 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
406 |
* le64_to_cpu(header.granularity); |
407 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
408 |
/ l1_entry_sectors; |
409 |
extent = vmdk_add_extent(bs, bs->file, false,
|
410 |
le64_to_cpu(header.capacity), |
411 |
le64_to_cpu(header.gd_offset) << 9,
|
412 |
le64_to_cpu(header.rgd_offset) << 9,
|
413 |
l1_size, |
414 |
le32_to_cpu(header.num_gtes_per_gte), |
415 |
le64_to_cpu(header.granularity)); |
416 |
if (extent->l1_entry_sectors <= 0) { |
417 |
ret = -EINVAL; |
418 |
goto fail;
|
419 |
} |
420 |
/* try to open parent images, if exist */
|
421 |
ret = vmdk_parent_open(bs); |
422 |
if (ret) {
|
423 |
goto fail;
|
424 |
} |
425 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
426 |
ret = vmdk_init_tables(bs, extent); |
427 |
if (ret) {
|
428 |
goto fail;
|
429 |
} |
430 |
return 0; |
431 |
fail:
|
432 |
vmdk_free_extents(bs); |
433 |
return ret;
|
434 |
} |
435 |
|
436 |
/* find an option value out of descriptor file */
|
437 |
static int vmdk_parse_description(const char *desc, const char *opt_name, |
438 |
char *buf, int buf_size) |
439 |
{ |
440 |
char *opt_pos, *opt_end;
|
441 |
const char *end = desc + strlen(desc); |
442 |
|
443 |
opt_pos = strstr(desc, opt_name); |
444 |
if (!opt_pos) {
|
445 |
return -1; |
446 |
} |
447 |
/* Skip "=\"" following opt_name */
|
448 |
opt_pos += strlen(opt_name) + 2;
|
449 |
if (opt_pos >= end) {
|
450 |
return -1; |
451 |
} |
452 |
opt_end = opt_pos; |
453 |
while (opt_end < end && *opt_end != '"') { |
454 |
opt_end++; |
455 |
} |
456 |
if (opt_end == end || buf_size < opt_end - opt_pos + 1) { |
457 |
return -1; |
458 |
} |
459 |
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
460 |
return 0; |
461 |
} |
462 |
|
463 |
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, |
464 |
const char *desc_file_path) |
465 |
{ |
466 |
int ret;
|
467 |
char access[11]; |
468 |
char type[11]; |
469 |
char fname[512]; |
470 |
const char *p = desc; |
471 |
int64_t sectors = 0;
|
472 |
int64_t flat_offset; |
473 |
|
474 |
while (*p) {
|
475 |
/* parse extent line:
|
476 |
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
477 |
* or
|
478 |
* RW [size in sectors] SPARSE "file-name.vmdk"
|
479 |
*/
|
480 |
flat_offset = -1;
|
481 |
ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, |
482 |
access, §ors, type, fname, &flat_offset); |
483 |
if (ret < 4 || strcmp(access, "RW")) { |
484 |
goto next_line;
|
485 |
} else if (!strcmp(type, "FLAT")) { |
486 |
if (ret != 5 || flat_offset < 0) { |
487 |
return -EINVAL;
|
488 |
} |
489 |
} else if (ret != 4) { |
490 |
return -EINVAL;
|
491 |
} |
492 |
|
493 |
/* trim the quotation marks around */
|
494 |
if (fname[0] == '"') { |
495 |
memmove(fname, fname + 1, strlen(fname));
|
496 |
if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { |
497 |
return -EINVAL;
|
498 |
} |
499 |
fname[strlen(fname) - 1] = '\0'; |
500 |
} |
501 |
if (sectors <= 0 || |
502 |
(strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || |
503 |
(strcmp(access, "RW"))) {
|
504 |
goto next_line;
|
505 |
} |
506 |
|
507 |
/* save to extents array */
|
508 |
if (!strcmp(type, "FLAT")) { |
509 |
/* FLAT extent */
|
510 |
char extent_path[PATH_MAX];
|
511 |
BlockDriverState *extent_file; |
512 |
VmdkExtent *extent; |
513 |
|
514 |
path_combine(extent_path, sizeof(extent_path),
|
515 |
desc_file_path, fname); |
516 |
ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); |
517 |
if (ret) {
|
518 |
return ret;
|
519 |
} |
520 |
extent = vmdk_add_extent(bs, extent_file, true, sectors,
|
521 |
0, 0, 0, 0, sectors); |
522 |
extent->flat_start_offset = flat_offset; |
523 |
} else {
|
524 |
/* SPARSE extent, not supported for now */
|
525 |
fprintf(stderr, |
526 |
"VMDK: Not supported extent type \"%s\""".\n", type); |
527 |
return -ENOTSUP;
|
528 |
} |
529 |
next_line:
|
530 |
/* move to next line */
|
531 |
while (*p && *p != '\n') { |
532 |
p++; |
533 |
} |
534 |
p++; |
535 |
} |
536 |
return 0; |
537 |
} |
538 |
|
539 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags) |
540 |
{ |
541 |
int ret;
|
542 |
char buf[2048]; |
543 |
char ct[128]; |
544 |
BDRVVmdkState *s = bs->opaque; |
545 |
|
546 |
ret = bdrv_pread(bs->file, 0, buf, sizeof(buf)); |
547 |
if (ret < 0) { |
548 |
return ret;
|
549 |
} |
550 |
buf[2047] = '\0'; |
551 |
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { |
552 |
return -EINVAL;
|
553 |
} |
554 |
if (strcmp(ct, "monolithicFlat")) { |
555 |
fprintf(stderr, |
556 |
"VMDK: Not supported image type \"%s\""".\n", ct); |
557 |
return -ENOTSUP;
|
558 |
} |
559 |
s->desc_offset = 0;
|
560 |
ret = vmdk_parse_extents(buf, bs, bs->file->filename); |
561 |
if (ret) {
|
562 |
return ret;
|
563 |
} |
564 |
|
565 |
/* try to open parent images, if exist */
|
566 |
if (vmdk_parent_open(bs)) {
|
567 |
qemu_free(s->extents); |
568 |
return -EINVAL;
|
569 |
} |
570 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
571 |
return 0; |
572 |
} |
573 |
|
574 |
static int vmdk_open(BlockDriverState *bs, int flags) |
575 |
{ |
576 |
uint32_t magic; |
577 |
|
578 |
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
579 |
return -EIO;
|
580 |
} |
581 |
|
582 |
magic = be32_to_cpu(magic); |
583 |
if (magic == VMDK3_MAGIC) {
|
584 |
return vmdk_open_vmdk3(bs, flags);
|
585 |
} else if (magic == VMDK4_MAGIC) { |
586 |
return vmdk_open_vmdk4(bs, flags);
|
587 |
} else {
|
588 |
return vmdk_open_desc_file(bs, flags);
|
589 |
} |
590 |
} |
591 |
|
592 |
static int get_whole_cluster(BlockDriverState *bs, |
593 |
VmdkExtent *extent, |
594 |
uint64_t cluster_offset, |
595 |
uint64_t offset, |
596 |
bool allocate)
|
597 |
{ |
598 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
599 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
600 |
|
601 |
/* we will be here if it's first write on non-exist grain(cluster).
|
602 |
* try to read from parent image, if exist */
|
603 |
if (bs->backing_hd) {
|
604 |
int ret;
|
605 |
|
606 |
if (!vmdk_is_cid_valid(bs)) {
|
607 |
return -1; |
608 |
} |
609 |
|
610 |
/* floor offset to cluster */
|
611 |
offset -= offset % (extent->cluster_sectors * 512);
|
612 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
613 |
extent->cluster_sectors); |
614 |
if (ret < 0) { |
615 |
return -1; |
616 |
} |
617 |
|
618 |
/* Write grain only into the active image */
|
619 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
620 |
extent->cluster_sectors); |
621 |
if (ret < 0) { |
622 |
return -1; |
623 |
} |
624 |
} |
625 |
return 0; |
626 |
} |
627 |
|
628 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
629 |
{ |
630 |
/* update L2 table */
|
631 |
if (bdrv_pwrite_sync(
|
632 |
extent->file, |
633 |
((int64_t)m_data->l2_offset * 512)
|
634 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
635 |
&(m_data->offset), |
636 |
sizeof(m_data->offset)
|
637 |
) < 0) {
|
638 |
return -1; |
639 |
} |
640 |
/* update backup L2 table */
|
641 |
if (extent->l1_backup_table_offset != 0) { |
642 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
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), sizeof(m_data->offset)
|
648 |
) < 0) {
|
649 |
return -1; |
650 |
} |
651 |
} |
652 |
|
653 |
return 0; |
654 |
} |
655 |
|
656 |
static int get_cluster_offset(BlockDriverState *bs, |
657 |
VmdkExtent *extent, |
658 |
VmdkMetaData *m_data, |
659 |
uint64_t offset, |
660 |
int allocate,
|
661 |
uint64_t *cluster_offset) |
662 |
{ |
663 |
unsigned int l1_index, l2_offset, l2_index; |
664 |
int min_index, i, j;
|
665 |
uint32_t min_count, *l2_table, tmp = 0;
|
666 |
|
667 |
if (m_data) {
|
668 |
m_data->valid = 0;
|
669 |
} |
670 |
if (extent->flat) {
|
671 |
*cluster_offset = extent->flat_start_offset; |
672 |
return 0; |
673 |
} |
674 |
|
675 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
676 |
if (l1_index >= extent->l1_size) {
|
677 |
return -1; |
678 |
} |
679 |
l2_offset = extent->l1_table[l1_index]; |
680 |
if (!l2_offset) {
|
681 |
return -1; |
682 |
} |
683 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
684 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
685 |
/* increment the hit count */
|
686 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
687 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
688 |
extent->l2_cache_counts[j] >>= 1;
|
689 |
} |
690 |
} |
691 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
692 |
goto found;
|
693 |
} |
694 |
} |
695 |
/* not found: load a new entry in the least used one */
|
696 |
min_index = 0;
|
697 |
min_count = 0xffffffff;
|
698 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
699 |
if (extent->l2_cache_counts[i] < min_count) {
|
700 |
min_count = extent->l2_cache_counts[i]; |
701 |
min_index = i; |
702 |
} |
703 |
} |
704 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
705 |
if (bdrv_pread(
|
706 |
extent->file, |
707 |
(int64_t)l2_offset * 512,
|
708 |
l2_table, |
709 |
extent->l2_size * sizeof(uint32_t)
|
710 |
) != extent->l2_size * sizeof(uint32_t)) {
|
711 |
return -1; |
712 |
} |
713 |
|
714 |
extent->l2_cache_offsets[min_index] = l2_offset; |
715 |
extent->l2_cache_counts[min_index] = 1;
|
716 |
found:
|
717 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
718 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
719 |
|
720 |
if (!*cluster_offset) {
|
721 |
if (!allocate) {
|
722 |
return -1; |
723 |
} |
724 |
|
725 |
/* Avoid the L2 tables update for the images that have snapshots. */
|
726 |
*cluster_offset = bdrv_getlength(extent->file); |
727 |
bdrv_truncate( |
728 |
extent->file, |
729 |
*cluster_offset + (extent->cluster_sectors << 9)
|
730 |
); |
731 |
|
732 |
*cluster_offset >>= 9;
|
733 |
tmp = cpu_to_le32(*cluster_offset); |
734 |
l2_table[l2_index] = tmp; |
735 |
|
736 |
/* First of all we write grain itself, to avoid race condition
|
737 |
* that may to corrupt the image.
|
738 |
* This problem may occur because of insufficient space on host disk
|
739 |
* or inappropriate VM shutdown.
|
740 |
*/
|
741 |
if (get_whole_cluster(
|
742 |
bs, extent, *cluster_offset, offset, allocate) == -1) {
|
743 |
return -1; |
744 |
} |
745 |
|
746 |
if (m_data) {
|
747 |
m_data->offset = tmp; |
748 |
m_data->l1_index = l1_index; |
749 |
m_data->l2_index = l2_index; |
750 |
m_data->l2_offset = l2_offset; |
751 |
m_data->valid = 1;
|
752 |
} |
753 |
} |
754 |
*cluster_offset <<= 9;
|
755 |
return 0; |
756 |
} |
757 |
|
758 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
759 |
int64_t sector_num, VmdkExtent *start_hint) |
760 |
{ |
761 |
VmdkExtent *extent = start_hint; |
762 |
|
763 |
if (!extent) {
|
764 |
extent = &s->extents[0];
|
765 |
} |
766 |
while (extent < &s->extents[s->num_extents]) {
|
767 |
if (sector_num < extent->end_sector) {
|
768 |
return extent;
|
769 |
} |
770 |
extent++; |
771 |
} |
772 |
return NULL; |
773 |
} |
774 |
|
775 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
776 |
int nb_sectors, int *pnum) |
777 |
{ |
778 |
BDRVVmdkState *s = bs->opaque; |
779 |
int64_t index_in_cluster, n, ret; |
780 |
uint64_t offset; |
781 |
VmdkExtent *extent; |
782 |
|
783 |
extent = find_extent(s, sector_num, NULL);
|
784 |
if (!extent) {
|
785 |
return 0; |
786 |
} |
787 |
ret = get_cluster_offset(bs, extent, NULL,
|
788 |
sector_num * 512, 0, &offset); |
789 |
/* get_cluster_offset returning 0 means success */
|
790 |
ret = !ret; |
791 |
|
792 |
index_in_cluster = sector_num % extent->cluster_sectors; |
793 |
n = extent->cluster_sectors - index_in_cluster; |
794 |
if (n > nb_sectors) {
|
795 |
n = nb_sectors; |
796 |
} |
797 |
*pnum = n; |
798 |
return ret;
|
799 |
} |
800 |
|
801 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
802 |
uint8_t *buf, int nb_sectors)
|
803 |
{ |
804 |
BDRVVmdkState *s = bs->opaque; |
805 |
int ret;
|
806 |
uint64_t n, index_in_cluster; |
807 |
VmdkExtent *extent = NULL;
|
808 |
uint64_t cluster_offset; |
809 |
|
810 |
while (nb_sectors > 0) { |
811 |
extent = find_extent(s, sector_num, extent); |
812 |
if (!extent) {
|
813 |
return -EIO;
|
814 |
} |
815 |
ret = get_cluster_offset( |
816 |
bs, extent, NULL,
|
817 |
sector_num << 9, 0, &cluster_offset); |
818 |
index_in_cluster = sector_num % extent->cluster_sectors; |
819 |
n = extent->cluster_sectors - index_in_cluster; |
820 |
if (n > nb_sectors) {
|
821 |
n = nb_sectors; |
822 |
} |
823 |
if (ret) {
|
824 |
/* if not allocated, try to read from parent image, if exist */
|
825 |
if (bs->backing_hd) {
|
826 |
if (!vmdk_is_cid_valid(bs)) {
|
827 |
return -EINVAL;
|
828 |
} |
829 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
830 |
if (ret < 0) { |
831 |
return ret;
|
832 |
} |
833 |
} else {
|
834 |
memset(buf, 0, 512 * n); |
835 |
} |
836 |
} else {
|
837 |
ret = bdrv_pread(extent->file, |
838 |
cluster_offset + index_in_cluster * 512,
|
839 |
buf, n * 512);
|
840 |
if (ret < 0) { |
841 |
return ret;
|
842 |
} |
843 |
} |
844 |
nb_sectors -= n; |
845 |
sector_num += n; |
846 |
buf += n * 512;
|
847 |
} |
848 |
return 0; |
849 |
} |
850 |
|
851 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
852 |
const uint8_t *buf, int nb_sectors) |
853 |
{ |
854 |
BDRVVmdkState *s = bs->opaque; |
855 |
VmdkExtent *extent = NULL;
|
856 |
int n, ret;
|
857 |
int64_t index_in_cluster; |
858 |
uint64_t cluster_offset; |
859 |
VmdkMetaData m_data; |
860 |
|
861 |
if (sector_num > bs->total_sectors) {
|
862 |
fprintf(stderr, |
863 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
864 |
" total_sectors=0x%" PRIx64 "\n", |
865 |
sector_num, bs->total_sectors); |
866 |
return -EIO;
|
867 |
} |
868 |
|
869 |
while (nb_sectors > 0) { |
870 |
extent = find_extent(s, sector_num, extent); |
871 |
if (!extent) {
|
872 |
return -EIO;
|
873 |
} |
874 |
ret = get_cluster_offset( |
875 |
bs, |
876 |
extent, |
877 |
&m_data, |
878 |
sector_num << 9, 1, |
879 |
&cluster_offset); |
880 |
if (ret) {
|
881 |
return -EINVAL;
|
882 |
} |
883 |
index_in_cluster = sector_num % extent->cluster_sectors; |
884 |
n = extent->cluster_sectors - index_in_cluster; |
885 |
if (n > nb_sectors) {
|
886 |
n = nb_sectors; |
887 |
} |
888 |
|
889 |
ret = bdrv_pwrite(extent->file, |
890 |
cluster_offset + index_in_cluster * 512,
|
891 |
buf, |
892 |
n * 512);
|
893 |
if (ret < 0) { |
894 |
return ret;
|
895 |
} |
896 |
if (m_data.valid) {
|
897 |
/* update L2 tables */
|
898 |
if (vmdk_L2update(extent, &m_data) == -1) { |
899 |
return -EIO;
|
900 |
} |
901 |
} |
902 |
nb_sectors -= n; |
903 |
sector_num += n; |
904 |
buf += n * 512;
|
905 |
|
906 |
/* update CID on the first write every time the virtual disk is
|
907 |
* 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 |
|
917 |
static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat) |
918 |
{ |
919 |
int ret, i;
|
920 |
int fd = 0; |
921 |
VMDK4Header header; |
922 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
923 |
|
924 |
fd = open( |
925 |
filename, |
926 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
927 |
0644);
|
928 |
if (fd < 0) { |
929 |
return -errno;
|
930 |
} |
931 |
if (flat) {
|
932 |
ret = ftruncate(fd, filesize); |
933 |
if (ret < 0) { |
934 |
ret = -errno; |
935 |
} |
936 |
goto exit;
|
937 |
} |
938 |
magic = cpu_to_be32(VMDK4_MAGIC); |
939 |
memset(&header, 0, sizeof(header)); |
940 |
header.version = 1;
|
941 |
header.flags = 3; /* ?? */ |
942 |
header.capacity = filesize / 512;
|
943 |
header.granularity = 128;
|
944 |
header.num_gtes_per_gte = 512;
|
945 |
|
946 |
grains = (filesize / 512 + header.granularity - 1) / header.granularity; |
947 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
948 |
gt_count = |
949 |
(grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
950 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
951 |
|
952 |
header.desc_offset = 1;
|
953 |
header.desc_size = 20;
|
954 |
header.rgd_offset = header.desc_offset + header.desc_size; |
955 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
956 |
header.grain_offset = |
957 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
958 |
header.granularity - 1) / header.granularity) *
|
959 |
header.granularity; |
960 |
/* swap endianness for all header fields */
|
961 |
header.version = cpu_to_le32(header.version); |
962 |
header.flags = cpu_to_le32(header.flags); |
963 |
header.capacity = cpu_to_le64(header.capacity); |
964 |
header.granularity = cpu_to_le64(header.granularity); |
965 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
966 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
967 |
header.desc_size = cpu_to_le64(header.desc_size); |
968 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
969 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
970 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
971 |
|
972 |
header.check_bytes[0] = 0xa; |
973 |
header.check_bytes[1] = 0x20; |
974 |
header.check_bytes[2] = 0xd; |
975 |
header.check_bytes[3] = 0xa; |
976 |
|
977 |
/* write all the data */
|
978 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
979 |
if (ret != sizeof(magic)) { |
980 |
ret = -errno; |
981 |
goto exit;
|
982 |
} |
983 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
984 |
if (ret != sizeof(header)) { |
985 |
ret = -errno; |
986 |
goto exit;
|
987 |
} |
988 |
|
989 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
990 |
if (ret < 0) { |
991 |
ret = -errno; |
992 |
goto exit;
|
993 |
} |
994 |
|
995 |
/* write grain directory */
|
996 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
997 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
998 |
i < gt_count; i++, tmp += gt_size) { |
999 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1000 |
if (ret != sizeof(tmp)) { |
1001 |
ret = -errno; |
1002 |
goto exit;
|
1003 |
} |
1004 |
} |
1005 |
|
1006 |
/* write backup grain directory */
|
1007 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1008 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1009 |
i < gt_count; i++, tmp += gt_size) { |
1010 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1011 |
if (ret != sizeof(tmp)) { |
1012 |
ret = -errno; |
1013 |
goto exit;
|
1014 |
} |
1015 |
} |
1016 |
|
1017 |
ret = 0;
|
1018 |
exit:
|
1019 |
close(fd); |
1020 |
return ret;
|
1021 |
} |
1022 |
|
1023 |
static int filename_decompose(const char *filename, char *path, char *prefix, |
1024 |
char *postfix, size_t buf_len)
|
1025 |
{ |
1026 |
const char *p, *q; |
1027 |
|
1028 |
if (filename == NULL || !strlen(filename)) { |
1029 |
fprintf(stderr, "Vmdk: no filename provided.\n");
|
1030 |
return -1; |
1031 |
} |
1032 |
p = strrchr(filename, '/');
|
1033 |
if (p == NULL) { |
1034 |
p = strrchr(filename, '\\');
|
1035 |
} |
1036 |
if (p == NULL) { |
1037 |
p = strrchr(filename, ':');
|
1038 |
} |
1039 |
if (p != NULL) { |
1040 |
p++; |
1041 |
if (p - filename >= buf_len) {
|
1042 |
return -1; |
1043 |
} |
1044 |
pstrcpy(path, p - filename + 1, filename);
|
1045 |
} else {
|
1046 |
p = filename; |
1047 |
path[0] = '\0'; |
1048 |
} |
1049 |
q = strrchr(p, '.');
|
1050 |
if (q == NULL) { |
1051 |
pstrcpy(prefix, buf_len, p); |
1052 |
postfix[0] = '\0'; |
1053 |
} else {
|
1054 |
if (q - p >= buf_len) {
|
1055 |
return -1; |
1056 |
} |
1057 |
pstrcpy(prefix, q - p + 1, p);
|
1058 |
pstrcpy(postfix, buf_len, q); |
1059 |
} |
1060 |
return 0; |
1061 |
} |
1062 |
|
1063 |
static int relative_path(char *dest, int dest_size, |
1064 |
const char *base, const char *target) |
1065 |
{ |
1066 |
int i = 0; |
1067 |
int n = 0; |
1068 |
const char *p, *q; |
1069 |
#ifdef _WIN32
|
1070 |
const char *sep = "\\"; |
1071 |
#else
|
1072 |
const char *sep = "/"; |
1073 |
#endif
|
1074 |
|
1075 |
if (!(dest && base && target)) {
|
1076 |
return -1; |
1077 |
} |
1078 |
if (path_is_absolute(target)) {
|
1079 |
dest[dest_size - 1] = '\0'; |
1080 |
strncpy(dest, target, dest_size - 1);
|
1081 |
return 0; |
1082 |
} |
1083 |
while (base[i] == target[i]) {
|
1084 |
i++; |
1085 |
} |
1086 |
p = &base[i]; |
1087 |
q = &target[i]; |
1088 |
while (*p) {
|
1089 |
if (*p == *sep) {
|
1090 |
n++; |
1091 |
} |
1092 |
p++; |
1093 |
} |
1094 |
dest[0] = '\0'; |
1095 |
for (; n; n--) {
|
1096 |
pstrcat(dest, dest_size, "..");
|
1097 |
pstrcat(dest, dest_size, sep); |
1098 |
} |
1099 |
pstrcat(dest, dest_size, q); |
1100 |
return 0; |
1101 |
} |
1102 |
|
1103 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
1104 |
{ |
1105 |
int fd, idx = 0; |
1106 |
char desc[BUF_SIZE];
|
1107 |
int64_t total_size = 0, filesize;
|
1108 |
const char *backing_file = NULL; |
1109 |
const char *fmt = NULL; |
1110 |
int flags = 0; |
1111 |
int ret = 0; |
1112 |
bool flat, split;
|
1113 |
char ext_desc_lines[BUF_SIZE] = ""; |
1114 |
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
|
1115 |
const int64_t split_size = 0x80000000; /* VMDK has constant split size */ |
1116 |
const char *desc_extent_line; |
1117 |
char parent_desc_line[BUF_SIZE] = ""; |
1118 |
uint32_t parent_cid = 0xffffffff;
|
1119 |
const char desc_template[] = |
1120 |
"# Disk DescriptorFile\n"
|
1121 |
"version=1\n"
|
1122 |
"CID=%x\n"
|
1123 |
"parentCID=%x\n"
|
1124 |
"createType=\"%s\"\n"
|
1125 |
"%s"
|
1126 |
"\n"
|
1127 |
"# Extent description\n"
|
1128 |
"%s"
|
1129 |
"\n"
|
1130 |
"# The Disk Data Base\n"
|
1131 |
"#DDB\n"
|
1132 |
"\n"
|
1133 |
"ddb.virtualHWVersion = \"%d\"\n"
|
1134 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
1135 |
"ddb.geometry.heads = \"16\"\n"
|
1136 |
"ddb.geometry.sectors = \"63\"\n"
|
1137 |
"ddb.adapterType = \"ide\"\n";
|
1138 |
|
1139 |
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
|
1140 |
return -EINVAL;
|
1141 |
} |
1142 |
/* Read out options */
|
1143 |
while (options && options->name) {
|
1144 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1145 |
total_size = options->value.n; |
1146 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1147 |
backing_file = options->value.s; |
1148 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
1149 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
|
1150 |
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { |
1151 |
fmt = options->value.s; |
1152 |
} |
1153 |
options++; |
1154 |
} |
1155 |
if (!fmt) {
|
1156 |
/* Default format to monolithicSparse */
|
1157 |
fmt = "monolithicSparse";
|
1158 |
} else if (strcmp(fmt, "monolithicFlat") && |
1159 |
strcmp(fmt, "monolithicSparse") &&
|
1160 |
strcmp(fmt, "twoGbMaxExtentSparse") &&
|
1161 |
strcmp(fmt, "twoGbMaxExtentFlat")) {
|
1162 |
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
|
1163 |
return -EINVAL;
|
1164 |
} |
1165 |
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1166 |
strcmp(fmt, "twoGbMaxExtentSparse"));
|
1167 |
flat = !(strcmp(fmt, "monolithicFlat") &&
|
1168 |
strcmp(fmt, "twoGbMaxExtentFlat"));
|
1169 |
if (flat) {
|
1170 |
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
1171 |
} else {
|
1172 |
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
1173 |
} |
1174 |
if (flat && backing_file) {
|
1175 |
/* not supporting backing file for flat image */
|
1176 |
return -ENOTSUP;
|
1177 |
} |
1178 |
if (backing_file) {
|
1179 |
char parent_filename[PATH_MAX];
|
1180 |
BlockDriverState *bs = bdrv_new("");
|
1181 |
ret = bdrv_open(bs, backing_file, 0, NULL); |
1182 |
if (ret != 0) { |
1183 |
bdrv_delete(bs); |
1184 |
return ret;
|
1185 |
} |
1186 |
if (strcmp(bs->drv->format_name, "vmdk")) { |
1187 |
bdrv_delete(bs); |
1188 |
return -EINVAL;
|
1189 |
} |
1190 |
filesize = bdrv_getlength(bs); |
1191 |
parent_cid = vmdk_read_cid(bs, 0);
|
1192 |
bdrv_delete(bs); |
1193 |
relative_path(parent_filename, sizeof(parent_filename),
|
1194 |
filename, backing_file); |
1195 |
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
1196 |
"parentFileNameHint=\"%s\"", parent_filename);
|
1197 |
} |
1198 |
|
1199 |
/* Create extents */
|
1200 |
filesize = total_size; |
1201 |
while (filesize > 0) { |
1202 |
char desc_line[BUF_SIZE];
|
1203 |
char ext_filename[PATH_MAX];
|
1204 |
char desc_filename[PATH_MAX];
|
1205 |
int64_t size = filesize; |
1206 |
|
1207 |
if (split && size > split_size) {
|
1208 |
size = split_size; |
1209 |
} |
1210 |
if (split) {
|
1211 |
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", |
1212 |
prefix, flat ? 'f' : 's', ++idx, postfix); |
1213 |
} else if (flat) { |
1214 |
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", |
1215 |
prefix, postfix); |
1216 |
} else {
|
1217 |
snprintf(desc_filename, sizeof(desc_filename), "%s%s", |
1218 |
prefix, postfix); |
1219 |
} |
1220 |
snprintf(ext_filename, sizeof(ext_filename), "%s%s", |
1221 |
path, desc_filename); |
1222 |
|
1223 |
if (vmdk_create_extent(ext_filename, size, flat)) {
|
1224 |
return -EINVAL;
|
1225 |
} |
1226 |
filesize -= size; |
1227 |
|
1228 |
/* Format description line */
|
1229 |
snprintf(desc_line, sizeof(desc_line),
|
1230 |
desc_extent_line, size / 512, desc_filename);
|
1231 |
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
1232 |
} |
1233 |
/* generate descriptor file */
|
1234 |
snprintf(desc, sizeof(desc), desc_template,
|
1235 |
(unsigned int)time(NULL), |
1236 |
parent_cid, |
1237 |
fmt, |
1238 |
parent_desc_line, |
1239 |
ext_desc_lines, |
1240 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1241 |
total_size / (int64_t)(63 * 16 * 512)); |
1242 |
if (split || flat) {
|
1243 |
fd = open( |
1244 |
filename, |
1245 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1246 |
0644);
|
1247 |
} else {
|
1248 |
fd = open( |
1249 |
filename, |
1250 |
O_WRONLY | O_BINARY | O_LARGEFILE, |
1251 |
0644);
|
1252 |
} |
1253 |
if (fd < 0) { |
1254 |
return -errno;
|
1255 |
} |
1256 |
/* the descriptor offset = 0x200 */
|
1257 |
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { |
1258 |
ret = -errno; |
1259 |
goto exit;
|
1260 |
} |
1261 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1262 |
if (ret != strlen(desc)) {
|
1263 |
ret = -errno; |
1264 |
goto exit;
|
1265 |
} |
1266 |
ret = 0;
|
1267 |
exit:
|
1268 |
close(fd); |
1269 |
return ret;
|
1270 |
} |
1271 |
|
1272 |
static void vmdk_close(BlockDriverState *bs) |
1273 |
{ |
1274 |
vmdk_free_extents(bs); |
1275 |
} |
1276 |
|
1277 |
static int vmdk_flush(BlockDriverState *bs) |
1278 |
{ |
1279 |
int i, ret, err;
|
1280 |
BDRVVmdkState *s = bs->opaque; |
1281 |
|
1282 |
ret = bdrv_flush(bs->file); |
1283 |
for (i = 0; i < s->num_extents; i++) { |
1284 |
err = bdrv_flush(s->extents[i].file); |
1285 |
if (err < 0) { |
1286 |
ret = err; |
1287 |
} |
1288 |
} |
1289 |
return ret;
|
1290 |
} |
1291 |
|
1292 |
|
1293 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1294 |
{ |
1295 |
.name = BLOCK_OPT_SIZE, |
1296 |
.type = OPT_SIZE, |
1297 |
.help = "Virtual disk size"
|
1298 |
}, |
1299 |
{ |
1300 |
.name = BLOCK_OPT_BACKING_FILE, |
1301 |
.type = OPT_STRING, |
1302 |
.help = "File name of a base image"
|
1303 |
}, |
1304 |
{ |
1305 |
.name = BLOCK_OPT_COMPAT6, |
1306 |
.type = OPT_FLAG, |
1307 |
.help = "VMDK version 6 image"
|
1308 |
}, |
1309 |
{ |
1310 |
.name = BLOCK_OPT_SUBFMT, |
1311 |
.type = OPT_STRING, |
1312 |
.help = |
1313 |
"VMDK flat extent format, can be one of "
|
1314 |
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat} "
|
1315 |
}, |
1316 |
{ NULL }
|
1317 |
}; |
1318 |
|
1319 |
static BlockDriver bdrv_vmdk = {
|
1320 |
.format_name = "vmdk",
|
1321 |
.instance_size = sizeof(BDRVVmdkState),
|
1322 |
.bdrv_probe = vmdk_probe, |
1323 |
.bdrv_open = vmdk_open, |
1324 |
.bdrv_read = vmdk_read, |
1325 |
.bdrv_write = vmdk_write, |
1326 |
.bdrv_close = vmdk_close, |
1327 |
.bdrv_create = vmdk_create, |
1328 |
.bdrv_flush = vmdk_flush, |
1329 |
.bdrv_is_allocated = vmdk_is_allocated, |
1330 |
|
1331 |
.create_options = vmdk_create_options, |
1332 |
}; |
1333 |
|
1334 |
static void bdrv_vmdk_init(void) |
1335 |
{ |
1336 |
bdrv_register(&bdrv_vmdk); |
1337 |
} |
1338 |
|
1339 |
block_init(bdrv_vmdk_init); |