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/*
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* Block driver for the VMDK format
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*
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* Copyright (c) 2004 Fabrice Bellard
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* Copyright (c) 2005 Filip Navara
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
27 |
#include "block_int.h" |
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#include "module.h" |
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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; |
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 |
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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; |
75 |
|
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unsigned int l2_size; |
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uint32_t *l2_cache; |
78 |
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; |
83 |
|
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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; |
92 |
|
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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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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")) { |
139 |
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; |
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} |
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} |
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if (end - p >= strlen("version=X\r\n")) { |
145 |
if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || |
146 |
strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { |
147 |
return 100; |
148 |
} |
149 |
} |
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return 0; |
151 |
} |
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return 0; |
153 |
} |
154 |
} |
155 |
|
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#define CHECK_CID 1 |
157 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
160 |
#define HEADER_SIZE 512 // first sector of 512 bytes |
161 |
|
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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; |
166 |
|
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for (i = 0; i < s->num_extents; i++) { |
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qemu_free(s->extents[i].l1_table); |
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qemu_free(s->extents[i].l2_cache); |
170 |
qemu_free(s->extents[i].l1_backup_table); |
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} |
172 |
qemu_free(s->extents); |
173 |
} |
174 |
|
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
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{ |
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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; |
180 |
size_t cid_str_size; |
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BDRVVmdkState *s = bs->opaque; |
182 |
|
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return 0; |
185 |
} |
186 |
|
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if (parent) {
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cid_str = "parentCID";
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cid_str_size = sizeof("parentCID"); |
190 |
} else {
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cid_str = "CID";
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cid_str_size = sizeof("CID"); |
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} |
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|
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if ((p_name = strstr(desc,cid_str)) != NULL) { |
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p_name += cid_str_size; |
197 |
sscanf(p_name,"%x",&cid);
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} |
199 |
|
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return cid;
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} |
202 |
|
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
204 |
{ |
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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; |
208 |
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memset(desc, 0, sizeof(desc)); |
210 |
if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return -EIO;
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} |
213 |
|
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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) { |
217 |
p_name += sizeof("CID"); |
218 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
219 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
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} |
221 |
|
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if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) { |
223 |
return -EIO;
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} |
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return 0; |
226 |
} |
227 |
|
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static int vmdk_is_cid_valid(BlockDriverState *bs) |
229 |
{ |
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#ifdef CHECK_CID
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BDRVVmdkState *s = bs->opaque; |
232 |
BlockDriverState *p_bs = bs->backing_hd; |
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uint32_t cur_pcid; |
234 |
|
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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; |
240 |
} |
241 |
#endif
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// CID valid
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return 1; |
244 |
} |
245 |
|
246 |
static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
247 |
{ |
248 |
int snp_fd, p_fd;
|
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int ret;
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uint32_t p_cid; |
251 |
char *p_name, *gd_buf, *rgd_buf;
|
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const char *real_filename, *temp_str; |
253 |
VMDK4Header header; |
254 |
uint32_t gde_entries, gd_size; |
255 |
int64_t gd_offset, rgd_offset, capacity, gt_size; |
256 |
char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
|
257 |
static const char desc_template[] = |
258 |
"# 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";
|
271 |
|
272 |
snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
|
273 |
if (snp_fd < 0) |
274 |
return -errno;
|
275 |
p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
276 |
if (p_fd < 0) { |
277 |
close(snp_fd); |
278 |
return -errno;
|
279 |
} |
280 |
|
281 |
/* read the header */
|
282 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
283 |
ret = -errno; |
284 |
goto fail;
|
285 |
} |
286 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
|
287 |
ret = -errno; |
288 |
goto fail;
|
289 |
} |
290 |
|
291 |
/* write the header */
|
292 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
293 |
ret = -errno; |
294 |
goto fail;
|
295 |
} |
296 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) { |
297 |
ret = -errno; |
298 |
goto fail;
|
299 |
} |
300 |
|
301 |
memset(&header, 0, sizeof(header)); |
302 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
303 |
|
304 |
if (ftruncate(snp_fd, header.grain_offset << 9)) { |
305 |
ret = -errno; |
306 |
goto fail;
|
307 |
} |
308 |
/* the descriptor offset = 0x200 */
|
309 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
310 |
ret = -errno; |
311 |
goto fail;
|
312 |
} |
313 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
314 |
ret = -errno; |
315 |
goto fail;
|
316 |
} |
317 |
|
318 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
319 |
p_name += sizeof("CID"); |
320 |
sscanf(p_name,"%x",&p_cid);
|
321 |
} |
322 |
|
323 |
real_filename = filename; |
324 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
325 |
real_filename = temp_str + 1;
|
326 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
327 |
real_filename = temp_str + 1;
|
328 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
329 |
real_filename = temp_str + 1;
|
330 |
|
331 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
|
332 |
(uint32_t)header.capacity, real_filename); |
333 |
|
334 |
/* write the descriptor */
|
335 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
336 |
ret = -errno; |
337 |
goto fail;
|
338 |
} |
339 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { |
340 |
ret = -errno; |
341 |
goto fail;
|
342 |
} |
343 |
|
344 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
345 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
346 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
347 |
/*
|
348 |
* Each GDE span 32M disk, means:
|
349 |
* 512 GTE per GT, each GTE points to grain
|
350 |
*/
|
351 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
352 |
if (!gt_size) {
|
353 |
ret = -EINVAL; |
354 |
goto fail;
|
355 |
} |
356 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
357 |
gd_size = gde_entries * sizeof(uint32_t);
|
358 |
|
359 |
/* write RGD */
|
360 |
rgd_buf = qemu_malloc(gd_size); |
361 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
362 |
ret = -errno; |
363 |
goto fail_rgd;
|
364 |
} |
365 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
366 |
ret = -errno; |
367 |
goto fail_rgd;
|
368 |
} |
369 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { |
370 |
ret = -errno; |
371 |
goto fail_rgd;
|
372 |
} |
373 |
if (write(snp_fd, rgd_buf, gd_size) == -1) { |
374 |
ret = -errno; |
375 |
goto fail_rgd;
|
376 |
} |
377 |
|
378 |
/* write GD */
|
379 |
gd_buf = qemu_malloc(gd_size); |
380 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
381 |
ret = -errno; |
382 |
goto fail_gd;
|
383 |
} |
384 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
385 |
ret = -errno; |
386 |
goto fail_gd;
|
387 |
} |
388 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { |
389 |
ret = -errno; |
390 |
goto fail_gd;
|
391 |
} |
392 |
if (write(snp_fd, gd_buf, gd_size) == -1) { |
393 |
ret = -errno; |
394 |
goto fail_gd;
|
395 |
} |
396 |
ret = 0;
|
397 |
|
398 |
fail_gd:
|
399 |
qemu_free(gd_buf); |
400 |
fail_rgd:
|
401 |
qemu_free(rgd_buf); |
402 |
fail:
|
403 |
close(p_fd); |
404 |
close(snp_fd); |
405 |
return ret;
|
406 |
} |
407 |
|
408 |
static int vmdk_parent_open(BlockDriverState *bs) |
409 |
{ |
410 |
char *p_name;
|
411 |
char desc[DESC_SIZE + 1]; |
412 |
BDRVVmdkState *s = bs->opaque; |
413 |
|
414 |
desc[DESC_SIZE] = '\0';
|
415 |
if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
|
416 |
return -1; |
417 |
} |
418 |
|
419 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
420 |
char *end_name;
|
421 |
|
422 |
p_name += sizeof("parentFileNameHint") + 1; |
423 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
424 |
return -1; |
425 |
if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
426 |
return -1; |
427 |
|
428 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
429 |
} |
430 |
|
431 |
return 0; |
432 |
} |
433 |
|
434 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
435 |
* address. return NULL if allocation failed. */
|
436 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
437 |
BlockDriverState *file, bool flat, int64_t sectors,
|
438 |
int64_t l1_offset, int64_t l1_backup_offset, |
439 |
uint32_t l1_size, |
440 |
int l2_size, unsigned int cluster_sectors) |
441 |
{ |
442 |
VmdkExtent *extent; |
443 |
BDRVVmdkState *s = bs->opaque; |
444 |
|
445 |
s->extents = qemu_realloc(s->extents, |
446 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
447 |
extent = &s->extents[s->num_extents]; |
448 |
s->num_extents++; |
449 |
|
450 |
memset(extent, 0, sizeof(VmdkExtent)); |
451 |
extent->file = file; |
452 |
extent->flat = flat; |
453 |
extent->sectors = sectors; |
454 |
extent->l1_table_offset = l1_offset; |
455 |
extent->l1_backup_table_offset = l1_backup_offset; |
456 |
extent->l1_size = l1_size; |
457 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
458 |
extent->l2_size = l2_size; |
459 |
extent->cluster_sectors = cluster_sectors; |
460 |
|
461 |
if (s->num_extents > 1) { |
462 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
463 |
} else {
|
464 |
extent->end_sector = extent->sectors; |
465 |
} |
466 |
bs->total_sectors = extent->end_sector; |
467 |
return extent;
|
468 |
} |
469 |
|
470 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
471 |
{ |
472 |
int ret;
|
473 |
int l1_size, i;
|
474 |
|
475 |
/* read the L1 table */
|
476 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
477 |
extent->l1_table = qemu_malloc(l1_size); |
478 |
ret = bdrv_pread(extent->file, |
479 |
extent->l1_table_offset, |
480 |
extent->l1_table, |
481 |
l1_size); |
482 |
if (ret < 0) { |
483 |
goto fail_l1;
|
484 |
} |
485 |
for (i = 0; i < extent->l1_size; i++) { |
486 |
le32_to_cpus(&extent->l1_table[i]); |
487 |
} |
488 |
|
489 |
if (extent->l1_backup_table_offset) {
|
490 |
extent->l1_backup_table = qemu_malloc(l1_size); |
491 |
ret = bdrv_pread(extent->file, |
492 |
extent->l1_backup_table_offset, |
493 |
extent->l1_backup_table, |
494 |
l1_size); |
495 |
if (ret < 0) { |
496 |
goto fail_l1b;
|
497 |
} |
498 |
for (i = 0; i < extent->l1_size; i++) { |
499 |
le32_to_cpus(&extent->l1_backup_table[i]); |
500 |
} |
501 |
} |
502 |
|
503 |
extent->l2_cache = |
504 |
qemu_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
505 |
return 0; |
506 |
fail_l1b:
|
507 |
qemu_free(extent->l1_backup_table); |
508 |
fail_l1:
|
509 |
qemu_free(extent->l1_table); |
510 |
return ret;
|
511 |
} |
512 |
|
513 |
static int vmdk_open_vmdk3(BlockDriverState *bs, int flags) |
514 |
{ |
515 |
int ret;
|
516 |
uint32_t magic; |
517 |
VMDK3Header header; |
518 |
BDRVVmdkState *s = bs->opaque; |
519 |
VmdkExtent *extent; |
520 |
|
521 |
s->desc_offset = 0x200;
|
522 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
523 |
if (ret < 0) { |
524 |
goto fail;
|
525 |
} |
526 |
extent = vmdk_add_extent(bs, |
527 |
bs->file, false,
|
528 |
le32_to_cpu(header.disk_sectors), |
529 |
le32_to_cpu(header.l1dir_offset) << 9,
|
530 |
0, 1 << 6, 1 << 9, |
531 |
le32_to_cpu(header.granularity)); |
532 |
ret = vmdk_init_tables(bs, extent); |
533 |
if (ret) {
|
534 |
/* vmdk_init_tables cleans up on fail, so only free allocation of
|
535 |
* vmdk_add_extent here. */
|
536 |
goto fail;
|
537 |
} |
538 |
return 0; |
539 |
fail:
|
540 |
vmdk_free_extents(bs); |
541 |
return ret;
|
542 |
} |
543 |
|
544 |
static int vmdk_open_vmdk4(BlockDriverState *bs, int flags) |
545 |
{ |
546 |
int ret;
|
547 |
uint32_t magic; |
548 |
uint32_t l1_size, l1_entry_sectors; |
549 |
VMDK4Header header; |
550 |
BDRVVmdkState *s = bs->opaque; |
551 |
VmdkExtent *extent; |
552 |
|
553 |
s->desc_offset = 0x200;
|
554 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
555 |
if (ret < 0) { |
556 |
goto fail;
|
557 |
} |
558 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
559 |
* le64_to_cpu(header.granularity); |
560 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
561 |
/ l1_entry_sectors; |
562 |
extent = vmdk_add_extent(bs, bs->file, false,
|
563 |
le64_to_cpu(header.capacity), |
564 |
le64_to_cpu(header.gd_offset) << 9,
|
565 |
le64_to_cpu(header.rgd_offset) << 9,
|
566 |
l1_size, |
567 |
le32_to_cpu(header.num_gtes_per_gte), |
568 |
le64_to_cpu(header.granularity)); |
569 |
if (extent->l1_entry_sectors <= 0) { |
570 |
ret = -EINVAL; |
571 |
goto fail;
|
572 |
} |
573 |
/* try to open parent images, if exist */
|
574 |
ret = vmdk_parent_open(bs); |
575 |
if (ret) {
|
576 |
goto fail;
|
577 |
} |
578 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
579 |
ret = vmdk_init_tables(bs, extent); |
580 |
if (ret) {
|
581 |
goto fail;
|
582 |
} |
583 |
return 0; |
584 |
fail:
|
585 |
vmdk_free_extents(bs); |
586 |
return ret;
|
587 |
} |
588 |
|
589 |
/* find an option value out of descriptor file */
|
590 |
static int vmdk_parse_description(const char *desc, const char *opt_name, |
591 |
char *buf, int buf_size) |
592 |
{ |
593 |
char *opt_pos, *opt_end;
|
594 |
const char *end = desc + strlen(desc); |
595 |
|
596 |
opt_pos = strstr(desc, opt_name); |
597 |
if (!opt_pos) {
|
598 |
return -1; |
599 |
} |
600 |
/* Skip "=\"" following opt_name */
|
601 |
opt_pos += strlen(opt_name) + 2;
|
602 |
if (opt_pos >= end) {
|
603 |
return -1; |
604 |
} |
605 |
opt_end = opt_pos; |
606 |
while (opt_end < end && *opt_end != '"') { |
607 |
opt_end++; |
608 |
} |
609 |
if (opt_end == end || buf_size < opt_end - opt_pos + 1) { |
610 |
return -1; |
611 |
} |
612 |
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
613 |
return 0; |
614 |
} |
615 |
|
616 |
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, |
617 |
const char *desc_file_path) |
618 |
{ |
619 |
int ret;
|
620 |
char access[11]; |
621 |
char type[11]; |
622 |
char fname[512]; |
623 |
const char *p = desc; |
624 |
int64_t sectors = 0;
|
625 |
int64_t flat_offset; |
626 |
|
627 |
while (*p) {
|
628 |
/* parse extent line:
|
629 |
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
630 |
* or
|
631 |
* RW [size in sectors] SPARSE "file-name.vmdk"
|
632 |
*/
|
633 |
flat_offset = -1;
|
634 |
ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, |
635 |
access, §ors, type, fname, &flat_offset); |
636 |
if (ret < 4 || strcmp(access, "RW")) { |
637 |
goto next_line;
|
638 |
} else if (!strcmp(type, "FLAT")) { |
639 |
if (ret != 5 || flat_offset < 0) { |
640 |
return -EINVAL;
|
641 |
} |
642 |
} else if (ret != 4) { |
643 |
return -EINVAL;
|
644 |
} |
645 |
|
646 |
/* trim the quotation marks around */
|
647 |
if (fname[0] == '"') { |
648 |
memmove(fname, fname + 1, strlen(fname));
|
649 |
if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { |
650 |
return -EINVAL;
|
651 |
} |
652 |
fname[strlen(fname) - 1] = '\0'; |
653 |
} |
654 |
if (sectors <= 0 || |
655 |
(strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || |
656 |
(strcmp(access, "RW"))) {
|
657 |
goto next_line;
|
658 |
} |
659 |
|
660 |
/* save to extents array */
|
661 |
if (!strcmp(type, "FLAT")) { |
662 |
/* FLAT extent */
|
663 |
char extent_path[PATH_MAX];
|
664 |
BlockDriverState *extent_file; |
665 |
VmdkExtent *extent; |
666 |
|
667 |
path_combine(extent_path, sizeof(extent_path),
|
668 |
desc_file_path, fname); |
669 |
ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); |
670 |
if (ret) {
|
671 |
return ret;
|
672 |
} |
673 |
extent = vmdk_add_extent(bs, extent_file, true, sectors,
|
674 |
0, 0, 0, 0, sectors); |
675 |
extent->flat_start_offset = flat_offset; |
676 |
} else {
|
677 |
/* SPARSE extent, not supported for now */
|
678 |
fprintf(stderr, |
679 |
"VMDK: Not supported extent type \"%s\""".\n", type); |
680 |
return -ENOTSUP;
|
681 |
} |
682 |
next_line:
|
683 |
/* move to next line */
|
684 |
while (*p && *p != '\n') { |
685 |
p++; |
686 |
} |
687 |
p++; |
688 |
} |
689 |
return 0; |
690 |
} |
691 |
|
692 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags) |
693 |
{ |
694 |
int ret;
|
695 |
char buf[2048]; |
696 |
char ct[128]; |
697 |
BDRVVmdkState *s = bs->opaque; |
698 |
|
699 |
ret = bdrv_pread(bs->file, 0, buf, sizeof(buf)); |
700 |
if (ret < 0) { |
701 |
return ret;
|
702 |
} |
703 |
buf[2047] = '\0'; |
704 |
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { |
705 |
return -EINVAL;
|
706 |
} |
707 |
if (strcmp(ct, "monolithicFlat")) { |
708 |
fprintf(stderr, |
709 |
"VMDK: Not supported image type \"%s\""".\n", ct); |
710 |
return -ENOTSUP;
|
711 |
} |
712 |
s->desc_offset = 0;
|
713 |
ret = vmdk_parse_extents(buf, bs, bs->file->filename); |
714 |
if (ret) {
|
715 |
return ret;
|
716 |
} |
717 |
|
718 |
/* try to open parent images, if exist */
|
719 |
if (vmdk_parent_open(bs)) {
|
720 |
qemu_free(s->extents); |
721 |
return -EINVAL;
|
722 |
} |
723 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
724 |
return 0; |
725 |
} |
726 |
|
727 |
static int vmdk_open(BlockDriverState *bs, int flags) |
728 |
{ |
729 |
uint32_t magic; |
730 |
|
731 |
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
732 |
return -EIO;
|
733 |
} |
734 |
|
735 |
magic = be32_to_cpu(magic); |
736 |
if (magic == VMDK3_MAGIC) {
|
737 |
return vmdk_open_vmdk3(bs, flags);
|
738 |
} else if (magic == VMDK4_MAGIC) { |
739 |
return vmdk_open_vmdk4(bs, flags);
|
740 |
} else {
|
741 |
return vmdk_open_desc_file(bs, flags);
|
742 |
} |
743 |
} |
744 |
|
745 |
static int get_whole_cluster(BlockDriverState *bs, |
746 |
VmdkExtent *extent, |
747 |
uint64_t cluster_offset, |
748 |
uint64_t offset, |
749 |
bool allocate)
|
750 |
{ |
751 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
752 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
753 |
|
754 |
/* we will be here if it's first write on non-exist grain(cluster).
|
755 |
* try to read from parent image, if exist */
|
756 |
if (bs->backing_hd) {
|
757 |
int ret;
|
758 |
|
759 |
if (!vmdk_is_cid_valid(bs))
|
760 |
return -1; |
761 |
|
762 |
/* floor offset to cluster */
|
763 |
offset -= offset % (extent->cluster_sectors * 512);
|
764 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
765 |
extent->cluster_sectors); |
766 |
if (ret < 0) { |
767 |
return -1; |
768 |
} |
769 |
|
770 |
/* Write grain only into the active image */
|
771 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
772 |
extent->cluster_sectors); |
773 |
if (ret < 0) { |
774 |
return -1; |
775 |
} |
776 |
} |
777 |
return 0; |
778 |
} |
779 |
|
780 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
781 |
{ |
782 |
/* update L2 table */
|
783 |
if (bdrv_pwrite_sync(
|
784 |
extent->file, |
785 |
((int64_t)m_data->l2_offset * 512)
|
786 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
787 |
&(m_data->offset), |
788 |
sizeof(m_data->offset)
|
789 |
) < 0) {
|
790 |
return -1; |
791 |
} |
792 |
/* update backup L2 table */
|
793 |
if (extent->l1_backup_table_offset != 0) { |
794 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
795 |
if (bdrv_pwrite_sync(
|
796 |
extent->file, |
797 |
((int64_t)m_data->l2_offset * 512)
|
798 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
799 |
&(m_data->offset), sizeof(m_data->offset)
|
800 |
) < 0) {
|
801 |
return -1; |
802 |
} |
803 |
} |
804 |
|
805 |
return 0; |
806 |
} |
807 |
|
808 |
static int get_cluster_offset(BlockDriverState *bs, |
809 |
VmdkExtent *extent, |
810 |
VmdkMetaData *m_data, |
811 |
uint64_t offset, |
812 |
int allocate,
|
813 |
uint64_t *cluster_offset) |
814 |
{ |
815 |
unsigned int l1_index, l2_offset, l2_index; |
816 |
int min_index, i, j;
|
817 |
uint32_t min_count, *l2_table, tmp = 0;
|
818 |
|
819 |
if (m_data)
|
820 |
m_data->valid = 0;
|
821 |
if (extent->flat) {
|
822 |
*cluster_offset = extent->flat_start_offset; |
823 |
return 0; |
824 |
} |
825 |
|
826 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
827 |
if (l1_index >= extent->l1_size) {
|
828 |
return -1; |
829 |
} |
830 |
l2_offset = extent->l1_table[l1_index]; |
831 |
if (!l2_offset) {
|
832 |
return -1; |
833 |
} |
834 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
835 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
836 |
/* increment the hit count */
|
837 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
838 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
839 |
extent->l2_cache_counts[j] >>= 1;
|
840 |
} |
841 |
} |
842 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
843 |
goto found;
|
844 |
} |
845 |
} |
846 |
/* not found: load a new entry in the least used one */
|
847 |
min_index = 0;
|
848 |
min_count = 0xffffffff;
|
849 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
850 |
if (extent->l2_cache_counts[i] < min_count) {
|
851 |
min_count = extent->l2_cache_counts[i]; |
852 |
min_index = i; |
853 |
} |
854 |
} |
855 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
856 |
if (bdrv_pread(
|
857 |
extent->file, |
858 |
(int64_t)l2_offset * 512,
|
859 |
l2_table, |
860 |
extent->l2_size * sizeof(uint32_t)
|
861 |
) != extent->l2_size * sizeof(uint32_t)) {
|
862 |
return -1; |
863 |
} |
864 |
|
865 |
extent->l2_cache_offsets[min_index] = l2_offset; |
866 |
extent->l2_cache_counts[min_index] = 1;
|
867 |
found:
|
868 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
869 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
870 |
|
871 |
if (!*cluster_offset) {
|
872 |
if (!allocate) {
|
873 |
return -1; |
874 |
} |
875 |
|
876 |
// Avoid the L2 tables update for the images that have snapshots.
|
877 |
*cluster_offset = bdrv_getlength(extent->file); |
878 |
bdrv_truncate( |
879 |
extent->file, |
880 |
*cluster_offset + (extent->cluster_sectors << 9)
|
881 |
); |
882 |
|
883 |
*cluster_offset >>= 9;
|
884 |
tmp = cpu_to_le32(*cluster_offset); |
885 |
l2_table[l2_index] = tmp; |
886 |
|
887 |
/* First of all we write grain itself, to avoid race condition
|
888 |
* that may to corrupt the image.
|
889 |
* This problem may occur because of insufficient space on host disk
|
890 |
* or inappropriate VM shutdown.
|
891 |
*/
|
892 |
if (get_whole_cluster(
|
893 |
bs, extent, *cluster_offset, offset, allocate) == -1)
|
894 |
return -1; |
895 |
|
896 |
if (m_data) {
|
897 |
m_data->offset = tmp; |
898 |
m_data->l1_index = l1_index; |
899 |
m_data->l2_index = l2_index; |
900 |
m_data->l2_offset = l2_offset; |
901 |
m_data->valid = 1;
|
902 |
} |
903 |
} |
904 |
*cluster_offset <<= 9;
|
905 |
return 0; |
906 |
} |
907 |
|
908 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
909 |
int64_t sector_num, VmdkExtent *start_hint) |
910 |
{ |
911 |
VmdkExtent *extent = start_hint; |
912 |
|
913 |
if (!extent) {
|
914 |
extent = &s->extents[0];
|
915 |
} |
916 |
while (extent < &s->extents[s->num_extents]) {
|
917 |
if (sector_num < extent->end_sector) {
|
918 |
return extent;
|
919 |
} |
920 |
extent++; |
921 |
} |
922 |
return NULL; |
923 |
} |
924 |
|
925 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
926 |
int nb_sectors, int *pnum) |
927 |
{ |
928 |
BDRVVmdkState *s = bs->opaque; |
929 |
int64_t index_in_cluster, n, ret; |
930 |
uint64_t offset; |
931 |
VmdkExtent *extent; |
932 |
|
933 |
extent = find_extent(s, sector_num, NULL);
|
934 |
if (!extent) {
|
935 |
return 0; |
936 |
} |
937 |
ret = get_cluster_offset(bs, extent, NULL,
|
938 |
sector_num * 512, 0, &offset); |
939 |
/* get_cluster_offset returning 0 means success */
|
940 |
ret = !ret; |
941 |
|
942 |
index_in_cluster = sector_num % extent->cluster_sectors; |
943 |
n = extent->cluster_sectors - index_in_cluster; |
944 |
if (n > nb_sectors)
|
945 |
n = nb_sectors; |
946 |
*pnum = n; |
947 |
return ret;
|
948 |
} |
949 |
|
950 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
951 |
uint8_t *buf, int nb_sectors)
|
952 |
{ |
953 |
BDRVVmdkState *s = bs->opaque; |
954 |
int ret;
|
955 |
uint64_t n, index_in_cluster; |
956 |
VmdkExtent *extent = NULL;
|
957 |
uint64_t cluster_offset; |
958 |
|
959 |
while (nb_sectors > 0) { |
960 |
extent = find_extent(s, sector_num, extent); |
961 |
if (!extent) {
|
962 |
return -EIO;
|
963 |
} |
964 |
ret = get_cluster_offset( |
965 |
bs, extent, NULL,
|
966 |
sector_num << 9, 0, &cluster_offset); |
967 |
index_in_cluster = sector_num % extent->cluster_sectors; |
968 |
n = extent->cluster_sectors - index_in_cluster; |
969 |
if (n > nb_sectors)
|
970 |
n = nb_sectors; |
971 |
if (ret) {
|
972 |
/* if not allocated, try to read from parent image, if exist */
|
973 |
if (bs->backing_hd) {
|
974 |
if (!vmdk_is_cid_valid(bs))
|
975 |
return -EINVAL;
|
976 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
977 |
if (ret < 0) |
978 |
return ret;
|
979 |
} else {
|
980 |
memset(buf, 0, 512 * n); |
981 |
} |
982 |
} else {
|
983 |
ret = bdrv_pread(extent->file, |
984 |
cluster_offset + index_in_cluster * 512,
|
985 |
buf, n * 512);
|
986 |
if (ret < 0) { |
987 |
return ret;
|
988 |
} |
989 |
} |
990 |
nb_sectors -= n; |
991 |
sector_num += n; |
992 |
buf += n * 512;
|
993 |
} |
994 |
return 0; |
995 |
} |
996 |
|
997 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
998 |
const uint8_t *buf, int nb_sectors) |
999 |
{ |
1000 |
BDRVVmdkState *s = bs->opaque; |
1001 |
VmdkExtent *extent = NULL;
|
1002 |
int n, ret;
|
1003 |
int64_t index_in_cluster; |
1004 |
uint64_t cluster_offset; |
1005 |
VmdkMetaData m_data; |
1006 |
|
1007 |
if (sector_num > bs->total_sectors) {
|
1008 |
fprintf(stderr, |
1009 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
1010 |
" total_sectors=0x%" PRIx64 "\n", |
1011 |
sector_num, bs->total_sectors); |
1012 |
return -EIO;
|
1013 |
} |
1014 |
|
1015 |
while (nb_sectors > 0) { |
1016 |
extent = find_extent(s, sector_num, extent); |
1017 |
if (!extent) {
|
1018 |
return -EIO;
|
1019 |
} |
1020 |
ret = get_cluster_offset( |
1021 |
bs, |
1022 |
extent, |
1023 |
&m_data, |
1024 |
sector_num << 9, 1, |
1025 |
&cluster_offset); |
1026 |
if (ret) {
|
1027 |
return -EINVAL;
|
1028 |
} |
1029 |
index_in_cluster = sector_num % extent->cluster_sectors; |
1030 |
n = extent->cluster_sectors - index_in_cluster; |
1031 |
if (n > nb_sectors) {
|
1032 |
n = nb_sectors; |
1033 |
} |
1034 |
|
1035 |
ret = bdrv_pwrite(extent->file, |
1036 |
cluster_offset + index_in_cluster * 512,
|
1037 |
buf, |
1038 |
n * 512);
|
1039 |
if (ret < 0) { |
1040 |
return ret;
|
1041 |
} |
1042 |
if (m_data.valid) {
|
1043 |
/* update L2 tables */
|
1044 |
if (vmdk_L2update(extent, &m_data) == -1) { |
1045 |
return -EIO;
|
1046 |
} |
1047 |
} |
1048 |
nb_sectors -= n; |
1049 |
sector_num += n; |
1050 |
buf += n * 512;
|
1051 |
|
1052 |
// update CID on the first write every time the virtual disk is opened
|
1053 |
if (!s->cid_updated) {
|
1054 |
vmdk_write_cid(bs, time(NULL));
|
1055 |
s->cid_updated = true;
|
1056 |
} |
1057 |
} |
1058 |
return 0; |
1059 |
} |
1060 |
|
1061 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
1062 |
{ |
1063 |
int fd, i;
|
1064 |
VMDK4Header header; |
1065 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
1066 |
static const char desc_template[] = |
1067 |
"# Disk DescriptorFile\n"
|
1068 |
"version=1\n"
|
1069 |
"CID=%x\n"
|
1070 |
"parentCID=ffffffff\n"
|
1071 |
"createType=\"monolithicSparse\"\n"
|
1072 |
"\n"
|
1073 |
"# Extent description\n"
|
1074 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
1075 |
"\n"
|
1076 |
"# The Disk Data Base \n"
|
1077 |
"#DDB\n"
|
1078 |
"\n"
|
1079 |
"ddb.virtualHWVersion = \"%d\"\n"
|
1080 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
1081 |
"ddb.geometry.heads = \"16\"\n"
|
1082 |
"ddb.geometry.sectors = \"63\"\n"
|
1083 |
"ddb.adapterType = \"ide\"\n";
|
1084 |
char desc[1024]; |
1085 |
const char *real_filename, *temp_str; |
1086 |
int64_t total_size = 0;
|
1087 |
const char *backing_file = NULL; |
1088 |
int flags = 0; |
1089 |
int ret;
|
1090 |
|
1091 |
// Read out options
|
1092 |
while (options && options->name) {
|
1093 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1094 |
total_size = options->value.n / 512;
|
1095 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1096 |
backing_file = options->value.s; |
1097 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
1098 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
1099 |
} |
1100 |
options++; |
1101 |
} |
1102 |
|
1103 |
/* XXX: add support for backing file */
|
1104 |
if (backing_file) {
|
1105 |
return vmdk_snapshot_create(filename, backing_file);
|
1106 |
} |
1107 |
|
1108 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1109 |
0644);
|
1110 |
if (fd < 0) |
1111 |
return -errno;
|
1112 |
magic = cpu_to_be32(VMDK4_MAGIC); |
1113 |
memset(&header, 0, sizeof(header)); |
1114 |
header.version = 1;
|
1115 |
header.flags = 3; /* ?? */ |
1116 |
header.capacity = total_size; |
1117 |
header.granularity = 128;
|
1118 |
header.num_gtes_per_gte = 512;
|
1119 |
|
1120 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
1121 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
1122 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
1123 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
1124 |
|
1125 |
header.desc_offset = 1;
|
1126 |
header.desc_size = 20;
|
1127 |
header.rgd_offset = header.desc_offset + header.desc_size; |
1128 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
1129 |
header.grain_offset = |
1130 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
1131 |
header.granularity - 1) / header.granularity) *
|
1132 |
header.granularity; |
1133 |
|
1134 |
/* swap endianness for all header fields */
|
1135 |
header.version = cpu_to_le32(header.version); |
1136 |
header.flags = cpu_to_le32(header.flags); |
1137 |
header.capacity = cpu_to_le64(header.capacity); |
1138 |
header.granularity = cpu_to_le64(header.granularity); |
1139 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
1140 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
1141 |
header.desc_size = cpu_to_le64(header.desc_size); |
1142 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
1143 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
1144 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
1145 |
|
1146 |
header.check_bytes[0] = 0xa; |
1147 |
header.check_bytes[1] = 0x20; |
1148 |
header.check_bytes[2] = 0xd; |
1149 |
header.check_bytes[3] = 0xa; |
1150 |
|
1151 |
/* write all the data */
|
1152 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
1153 |
if (ret != sizeof(magic)) { |
1154 |
ret = -errno; |
1155 |
goto exit;
|
1156 |
} |
1157 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
1158 |
if (ret != sizeof(header)) { |
1159 |
ret = -errno; |
1160 |
goto exit;
|
1161 |
} |
1162 |
|
1163 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
1164 |
if (ret < 0) { |
1165 |
ret = -errno; |
1166 |
goto exit;
|
1167 |
} |
1168 |
|
1169 |
/* write grain directory */
|
1170 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
1171 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
1172 |
i < gt_count; i++, tmp += gt_size) { |
1173 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1174 |
if (ret != sizeof(tmp)) { |
1175 |
ret = -errno; |
1176 |
goto exit;
|
1177 |
} |
1178 |
} |
1179 |
|
1180 |
/* write backup grain directory */
|
1181 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1182 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1183 |
i < gt_count; i++, tmp += gt_size) { |
1184 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1185 |
if (ret != sizeof(tmp)) { |
1186 |
ret = -errno; |
1187 |
goto exit;
|
1188 |
} |
1189 |
} |
1190 |
|
1191 |
/* compose the descriptor */
|
1192 |
real_filename = filename; |
1193 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
1194 |
real_filename = temp_str + 1;
|
1195 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
1196 |
real_filename = temp_str + 1;
|
1197 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
1198 |
real_filename = temp_str + 1;
|
1199 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
1200 |
total_size, real_filename, |
1201 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1202 |
total_size / (int64_t)(63 * 16)); |
1203 |
|
1204 |
/* write the descriptor */
|
1205 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
1206 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1207 |
if (ret != strlen(desc)) {
|
1208 |
ret = -errno; |
1209 |
goto exit;
|
1210 |
} |
1211 |
|
1212 |
ret = 0;
|
1213 |
exit:
|
1214 |
close(fd); |
1215 |
return ret;
|
1216 |
} |
1217 |
|
1218 |
static void vmdk_close(BlockDriverState *bs) |
1219 |
{ |
1220 |
vmdk_free_extents(bs); |
1221 |
} |
1222 |
|
1223 |
static int vmdk_flush(BlockDriverState *bs) |
1224 |
{ |
1225 |
int i, ret, err;
|
1226 |
BDRVVmdkState *s = bs->opaque; |
1227 |
|
1228 |
ret = bdrv_flush(bs->file); |
1229 |
for (i = 0; i < s->num_extents; i++) { |
1230 |
err = bdrv_flush(s->extents[i].file); |
1231 |
if (err < 0) { |
1232 |
ret = err; |
1233 |
} |
1234 |
} |
1235 |
return ret;
|
1236 |
} |
1237 |
|
1238 |
|
1239 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1240 |
{ |
1241 |
.name = BLOCK_OPT_SIZE, |
1242 |
.type = OPT_SIZE, |
1243 |
.help = "Virtual disk size"
|
1244 |
}, |
1245 |
{ |
1246 |
.name = BLOCK_OPT_BACKING_FILE, |
1247 |
.type = OPT_STRING, |
1248 |
.help = "File name of a base image"
|
1249 |
}, |
1250 |
{ |
1251 |
.name = BLOCK_OPT_COMPAT6, |
1252 |
.type = OPT_FLAG, |
1253 |
.help = "VMDK version 6 image"
|
1254 |
}, |
1255 |
{ NULL }
|
1256 |
}; |
1257 |
|
1258 |
static BlockDriver bdrv_vmdk = {
|
1259 |
.format_name = "vmdk",
|
1260 |
.instance_size = sizeof(BDRVVmdkState),
|
1261 |
.bdrv_probe = vmdk_probe, |
1262 |
.bdrv_open = vmdk_open, |
1263 |
.bdrv_read = vmdk_read, |
1264 |
.bdrv_write = vmdk_write, |
1265 |
.bdrv_close = vmdk_close, |
1266 |
.bdrv_create = vmdk_create, |
1267 |
.bdrv_flush = vmdk_flush, |
1268 |
.bdrv_is_allocated = vmdk_is_allocated, |
1269 |
|
1270 |
.create_options = vmdk_create_options, |
1271 |
}; |
1272 |
|
1273 |
static void bdrv_vmdk_init(void) |
1274 |
{ |
1275 |
bdrv_register(&bdrv_vmdk); |
1276 |
} |
1277 |
|
1278 |
block_init(bdrv_vmdk_init); |