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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; |
39 |
uint32_t l1dir_size; |
40 |
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; |
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; |
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|
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#define L2_CACHE_SIZE 16 |
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|
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typedef struct BDRVVmdkState { |
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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; |
70 |
|
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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]; |
75 |
|
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unsigned int cluster_sectors; |
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uint32_t parent_cid; |
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} BDRVVmdkState; |
79 |
|
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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; |
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|
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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; |
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|
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if (buf_size < 4) |
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return 0; |
94 |
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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return 0; |
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} |
101 |
|
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#define CHECK_CID 1 |
103 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
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#define HEADER_SIZE 512 // first sector of 512 bytes |
107 |
|
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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; |
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size_t cid_str_size; |
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|
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/* the descriptor offset = 0x200 */
|
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if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
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return 0; |
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|
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if (parent) {
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cid_str = "parentCID";
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cid_str_size = sizeof("parentCID"); |
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} 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; |
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sscanf(p_name,"%x",&cid);
|
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} |
131 |
|
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return cid;
|
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} |
134 |
|
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
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{ |
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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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|
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/* the descriptor offset = 0x200 */
|
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if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
142 |
return -1; |
143 |
|
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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) { |
147 |
p_name += sizeof("CID"); |
148 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
149 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
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} |
151 |
|
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if (bdrv_pwrite_sync(bs->file, 0x200, desc, DESC_SIZE) < 0) |
153 |
return -1; |
154 |
return 0; |
155 |
} |
156 |
|
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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; |
163 |
|
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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; |
169 |
} |
170 |
#endif
|
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// CID valid
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return 1; |
173 |
} |
174 |
|
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static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
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{ |
177 |
int snp_fd, p_fd;
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int ret;
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uint32_t p_cid; |
180 |
char *p_name, *gd_buf, *rgd_buf;
|
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const char *real_filename, *temp_str; |
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VMDK4Header header; |
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uint32_t gde_entries, gd_size; |
184 |
int64_t gd_offset, rgd_offset, capacity, gt_size; |
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char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
|
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static const char desc_template[] = |
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"# Disk DescriptorFile\n"
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"version=1\n"
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"CID=%x\n"
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"parentCID=%x\n"
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"createType=\"monolithicSparse\"\n"
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"parentFileNameHint=\"%s\"\n"
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"\n"
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"# Extent description\n"
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"RW %u SPARSE \"%s\"\n"
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"\n"
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"# The Disk Data Base \n"
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"#DDB\n"
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"\n";
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|
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snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
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if (snp_fd < 0) |
203 |
return -errno;
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p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
205 |
if (p_fd < 0) { |
206 |
close(snp_fd); |
207 |
return -errno;
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208 |
} |
209 |
|
210 |
/* read the header */
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211 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
212 |
ret = -errno; |
213 |
goto fail;
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214 |
} |
215 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
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ret = -errno; |
217 |
goto fail;
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218 |
} |
219 |
|
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/* write the header */
|
221 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
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ret = -errno; |
223 |
goto fail;
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} |
225 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) { |
226 |
ret = -errno; |
227 |
goto fail;
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} |
229 |
|
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memset(&header, 0, sizeof(header)); |
231 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
232 |
|
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if (ftruncate(snp_fd, header.grain_offset << 9)) { |
234 |
ret = -errno; |
235 |
goto fail;
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236 |
} |
237 |
/* the descriptor offset = 0x200 */
|
238 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
239 |
ret = -errno; |
240 |
goto fail;
|
241 |
} |
242 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
243 |
ret = -errno; |
244 |
goto fail;
|
245 |
} |
246 |
|
247 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
248 |
p_name += sizeof("CID"); |
249 |
sscanf(p_name,"%x",&p_cid);
|
250 |
} |
251 |
|
252 |
real_filename = filename; |
253 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
254 |
real_filename = temp_str + 1;
|
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if ((temp_str = strrchr(real_filename, '/')) != NULL) |
256 |
real_filename = temp_str + 1;
|
257 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
258 |
real_filename = temp_str + 1;
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|
260 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
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(uint32_t)header.capacity, real_filename); |
262 |
|
263 |
/* write the descriptor */
|
264 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
265 |
ret = -errno; |
266 |
goto fail;
|
267 |
} |
268 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { |
269 |
ret = -errno; |
270 |
goto fail;
|
271 |
} |
272 |
|
273 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
274 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
275 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
276 |
/*
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277 |
* Each GDE span 32M disk, means:
|
278 |
* 512 GTE per GT, each GTE points to grain
|
279 |
*/
|
280 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
281 |
if (!gt_size) {
|
282 |
ret = -EINVAL; |
283 |
goto fail;
|
284 |
} |
285 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
286 |
gd_size = gde_entries * sizeof(uint32_t);
|
287 |
|
288 |
/* write RGD */
|
289 |
rgd_buf = qemu_malloc(gd_size); |
290 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
291 |
ret = -errno; |
292 |
goto fail_rgd;
|
293 |
} |
294 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
295 |
ret = -errno; |
296 |
goto fail_rgd;
|
297 |
} |
298 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { |
299 |
ret = -errno; |
300 |
goto fail_rgd;
|
301 |
} |
302 |
if (write(snp_fd, rgd_buf, gd_size) == -1) { |
303 |
ret = -errno; |
304 |
goto fail_rgd;
|
305 |
} |
306 |
|
307 |
/* write GD */
|
308 |
gd_buf = qemu_malloc(gd_size); |
309 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
310 |
ret = -errno; |
311 |
goto fail_gd;
|
312 |
} |
313 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
314 |
ret = -errno; |
315 |
goto fail_gd;
|
316 |
} |
317 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { |
318 |
ret = -errno; |
319 |
goto fail_gd;
|
320 |
} |
321 |
if (write(snp_fd, gd_buf, gd_size) == -1) { |
322 |
ret = -errno; |
323 |
goto fail_gd;
|
324 |
} |
325 |
ret = 0;
|
326 |
|
327 |
fail_gd:
|
328 |
qemu_free(gd_buf); |
329 |
fail_rgd:
|
330 |
qemu_free(rgd_buf); |
331 |
fail:
|
332 |
close(p_fd); |
333 |
close(snp_fd); |
334 |
return ret;
|
335 |
} |
336 |
|
337 |
static int vmdk_parent_open(BlockDriverState *bs) |
338 |
{ |
339 |
char *p_name;
|
340 |
char desc[DESC_SIZE];
|
341 |
|
342 |
/* the descriptor offset = 0x200 */
|
343 |
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
344 |
return -1; |
345 |
|
346 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
347 |
char *end_name;
|
348 |
|
349 |
p_name += sizeof("parentFileNameHint") + 1; |
350 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
351 |
return -1; |
352 |
if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
353 |
return -1; |
354 |
|
355 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
356 |
} |
357 |
|
358 |
return 0; |
359 |
} |
360 |
|
361 |
static int vmdk_open(BlockDriverState *bs, int flags) |
362 |
{ |
363 |
BDRVVmdkState *s = bs->opaque; |
364 |
uint32_t magic; |
365 |
int l1_size, i;
|
366 |
|
367 |
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) |
368 |
goto fail;
|
369 |
|
370 |
magic = be32_to_cpu(magic); |
371 |
if (magic == VMDK3_MAGIC) {
|
372 |
VMDK3Header header; |
373 |
|
374 |
if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) != sizeof(header)) |
375 |
goto fail;
|
376 |
s->cluster_sectors = le32_to_cpu(header.granularity); |
377 |
s->l2_size = 1 << 9; |
378 |
s->l1_size = 1 << 6; |
379 |
bs->total_sectors = le32_to_cpu(header.disk_sectors); |
380 |
s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
|
381 |
s->l1_backup_table_offset = 0;
|
382 |
s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
383 |
} else if (magic == VMDK4_MAGIC) { |
384 |
VMDK4Header header; |
385 |
|
386 |
if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) != sizeof(header)) |
387 |
goto fail;
|
388 |
bs->total_sectors = le64_to_cpu(header.capacity); |
389 |
s->cluster_sectors = le64_to_cpu(header.granularity); |
390 |
s->l2_size = le32_to_cpu(header.num_gtes_per_gte); |
391 |
s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
392 |
if (s->l1_entry_sectors <= 0) |
393 |
goto fail;
|
394 |
s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
|
395 |
/ s->l1_entry_sectors; |
396 |
s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
|
397 |
s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
|
398 |
|
399 |
// try to open parent images, if exist
|
400 |
if (vmdk_parent_open(bs) != 0) |
401 |
goto fail;
|
402 |
// write the CID once after the image creation
|
403 |
s->parent_cid = vmdk_read_cid(bs,1);
|
404 |
} else {
|
405 |
goto fail;
|
406 |
} |
407 |
|
408 |
/* read the L1 table */
|
409 |
l1_size = s->l1_size * sizeof(uint32_t);
|
410 |
s->l1_table = qemu_malloc(l1_size); |
411 |
if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
|
412 |
goto fail;
|
413 |
for(i = 0; i < s->l1_size; i++) { |
414 |
le32_to_cpus(&s->l1_table[i]); |
415 |
} |
416 |
|
417 |
if (s->l1_backup_table_offset) {
|
418 |
s->l1_backup_table = qemu_malloc(l1_size); |
419 |
if (bdrv_pread(bs->file, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
|
420 |
goto fail;
|
421 |
for(i = 0; i < s->l1_size; i++) { |
422 |
le32_to_cpus(&s->l1_backup_table[i]); |
423 |
} |
424 |
} |
425 |
|
426 |
s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
427 |
return 0; |
428 |
fail:
|
429 |
qemu_free(s->l1_backup_table); |
430 |
qemu_free(s->l1_table); |
431 |
qemu_free(s->l2_cache); |
432 |
return -1; |
433 |
} |
434 |
|
435 |
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
436 |
uint64_t offset, int allocate);
|
437 |
|
438 |
static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, |
439 |
uint64_t offset, int allocate)
|
440 |
{ |
441 |
BDRVVmdkState *s = bs->opaque; |
442 |
uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB |
443 |
|
444 |
// we will be here if it's first write on non-exist grain(cluster).
|
445 |
// try to read from parent image, if exist
|
446 |
if (bs->backing_hd) {
|
447 |
int ret;
|
448 |
|
449 |
if (!vmdk_is_cid_valid(bs))
|
450 |
return -1; |
451 |
|
452 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
453 |
s->cluster_sectors); |
454 |
if (ret < 0) { |
455 |
return -1; |
456 |
} |
457 |
|
458 |
//Write grain only into the active image
|
459 |
ret = bdrv_write(bs->file, cluster_offset, whole_grain, |
460 |
s->cluster_sectors); |
461 |
if (ret < 0) { |
462 |
return -1; |
463 |
} |
464 |
} |
465 |
return 0; |
466 |
} |
467 |
|
468 |
static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) |
469 |
{ |
470 |
BDRVVmdkState *s = bs->opaque; |
471 |
|
472 |
/* update L2 table */
|
473 |
if (bdrv_pwrite_sync(bs->file, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), |
474 |
&(m_data->offset), sizeof(m_data->offset)) < 0) |
475 |
return -1; |
476 |
/* update backup L2 table */
|
477 |
if (s->l1_backup_table_offset != 0) { |
478 |
m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; |
479 |
if (bdrv_pwrite_sync(bs->file, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), |
480 |
&(m_data->offset), sizeof(m_data->offset)) < 0) |
481 |
return -1; |
482 |
} |
483 |
|
484 |
return 0; |
485 |
} |
486 |
|
487 |
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
488 |
uint64_t offset, int allocate)
|
489 |
{ |
490 |
BDRVVmdkState *s = bs->opaque; |
491 |
unsigned int l1_index, l2_offset, l2_index; |
492 |
int min_index, i, j;
|
493 |
uint32_t min_count, *l2_table, tmp = 0;
|
494 |
uint64_t cluster_offset; |
495 |
|
496 |
if (m_data)
|
497 |
m_data->valid = 0;
|
498 |
|
499 |
l1_index = (offset >> 9) / s->l1_entry_sectors;
|
500 |
if (l1_index >= s->l1_size)
|
501 |
return 0; |
502 |
l2_offset = s->l1_table[l1_index]; |
503 |
if (!l2_offset)
|
504 |
return 0; |
505 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
506 |
if (l2_offset == s->l2_cache_offsets[i]) {
|
507 |
/* increment the hit count */
|
508 |
if (++s->l2_cache_counts[i] == 0xffffffff) { |
509 |
for(j = 0; j < L2_CACHE_SIZE; j++) { |
510 |
s->l2_cache_counts[j] >>= 1;
|
511 |
} |
512 |
} |
513 |
l2_table = s->l2_cache + (i * s->l2_size); |
514 |
goto found;
|
515 |
} |
516 |
} |
517 |
/* not found: load a new entry in the least used one */
|
518 |
min_index = 0;
|
519 |
min_count = 0xffffffff;
|
520 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
521 |
if (s->l2_cache_counts[i] < min_count) {
|
522 |
min_count = s->l2_cache_counts[i]; |
523 |
min_index = i; |
524 |
} |
525 |
} |
526 |
l2_table = s->l2_cache + (min_index * s->l2_size); |
527 |
if (bdrv_pread(bs->file, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != |
528 |
s->l2_size * sizeof(uint32_t))
|
529 |
return 0; |
530 |
|
531 |
s->l2_cache_offsets[min_index] = l2_offset; |
532 |
s->l2_cache_counts[min_index] = 1;
|
533 |
found:
|
534 |
l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
|
535 |
cluster_offset = le32_to_cpu(l2_table[l2_index]); |
536 |
|
537 |
if (!cluster_offset) {
|
538 |
if (!allocate)
|
539 |
return 0; |
540 |
|
541 |
// Avoid the L2 tables update for the images that have snapshots.
|
542 |
cluster_offset = bdrv_getlength(bs->file); |
543 |
bdrv_truncate(bs->file, cluster_offset + (s->cluster_sectors << 9));
|
544 |
|
545 |
cluster_offset >>= 9;
|
546 |
tmp = cpu_to_le32(cluster_offset); |
547 |
l2_table[l2_index] = tmp; |
548 |
|
549 |
/* First of all we write grain itself, to avoid race condition
|
550 |
* that may to corrupt the image.
|
551 |
* This problem may occur because of insufficient space on host disk
|
552 |
* or inappropriate VM shutdown.
|
553 |
*/
|
554 |
if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) |
555 |
return 0; |
556 |
|
557 |
if (m_data) {
|
558 |
m_data->offset = tmp; |
559 |
m_data->l1_index = l1_index; |
560 |
m_data->l2_index = l2_index; |
561 |
m_data->l2_offset = l2_offset; |
562 |
m_data->valid = 1;
|
563 |
} |
564 |
} |
565 |
cluster_offset <<= 9;
|
566 |
return cluster_offset;
|
567 |
} |
568 |
|
569 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
570 |
int nb_sectors, int *pnum) |
571 |
{ |
572 |
BDRVVmdkState *s = bs->opaque; |
573 |
int index_in_cluster, n;
|
574 |
uint64_t cluster_offset; |
575 |
|
576 |
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
577 |
index_in_cluster = sector_num % s->cluster_sectors; |
578 |
n = s->cluster_sectors - index_in_cluster; |
579 |
if (n > nb_sectors)
|
580 |
n = nb_sectors; |
581 |
*pnum = n; |
582 |
return (cluster_offset != 0); |
583 |
} |
584 |
|
585 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
586 |
uint8_t *buf, int nb_sectors)
|
587 |
{ |
588 |
BDRVVmdkState *s = bs->opaque; |
589 |
int index_in_cluster, n, ret;
|
590 |
uint64_t cluster_offset; |
591 |
|
592 |
while (nb_sectors > 0) { |
593 |
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
594 |
index_in_cluster = sector_num % s->cluster_sectors; |
595 |
n = s->cluster_sectors - index_in_cluster; |
596 |
if (n > nb_sectors)
|
597 |
n = nb_sectors; |
598 |
if (!cluster_offset) {
|
599 |
// try to read from parent image, if exist
|
600 |
if (bs->backing_hd) {
|
601 |
if (!vmdk_is_cid_valid(bs))
|
602 |
return -1; |
603 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
604 |
if (ret < 0) |
605 |
return -1; |
606 |
} else {
|
607 |
memset(buf, 0, 512 * n); |
608 |
} |
609 |
} else {
|
610 |
if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
611 |
return -1; |
612 |
} |
613 |
nb_sectors -= n; |
614 |
sector_num += n; |
615 |
buf += n * 512;
|
616 |
} |
617 |
return 0; |
618 |
} |
619 |
|
620 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
621 |
const uint8_t *buf, int nb_sectors) |
622 |
{ |
623 |
BDRVVmdkState *s = bs->opaque; |
624 |
VmdkMetaData m_data; |
625 |
int index_in_cluster, n;
|
626 |
uint64_t cluster_offset; |
627 |
static int cid_update = 0; |
628 |
|
629 |
if (sector_num > bs->total_sectors) {
|
630 |
fprintf(stderr, |
631 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
632 |
" total_sectors=0x%" PRIx64 "\n", |
633 |
sector_num, bs->total_sectors); |
634 |
return -1; |
635 |
} |
636 |
|
637 |
while (nb_sectors > 0) { |
638 |
index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
639 |
n = s->cluster_sectors - index_in_cluster; |
640 |
if (n > nb_sectors)
|
641 |
n = nb_sectors; |
642 |
cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); |
643 |
if (!cluster_offset)
|
644 |
return -1; |
645 |
|
646 |
if (bdrv_pwrite(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
647 |
return -1; |
648 |
if (m_data.valid) {
|
649 |
/* update L2 tables */
|
650 |
if (vmdk_L2update(bs, &m_data) == -1) |
651 |
return -1; |
652 |
} |
653 |
nb_sectors -= n; |
654 |
sector_num += n; |
655 |
buf += n * 512;
|
656 |
|
657 |
// update CID on the first write every time the virtual disk is opened
|
658 |
if (!cid_update) {
|
659 |
vmdk_write_cid(bs, time(NULL));
|
660 |
cid_update++; |
661 |
} |
662 |
} |
663 |
return 0; |
664 |
} |
665 |
|
666 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
667 |
{ |
668 |
int fd, i;
|
669 |
VMDK4Header header; |
670 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
671 |
static const char desc_template[] = |
672 |
"# Disk DescriptorFile\n"
|
673 |
"version=1\n"
|
674 |
"CID=%x\n"
|
675 |
"parentCID=ffffffff\n"
|
676 |
"createType=\"monolithicSparse\"\n"
|
677 |
"\n"
|
678 |
"# Extent description\n"
|
679 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
680 |
"\n"
|
681 |
"# The Disk Data Base \n"
|
682 |
"#DDB\n"
|
683 |
"\n"
|
684 |
"ddb.virtualHWVersion = \"%d\"\n"
|
685 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
686 |
"ddb.geometry.heads = \"16\"\n"
|
687 |
"ddb.geometry.sectors = \"63\"\n"
|
688 |
"ddb.adapterType = \"ide\"\n";
|
689 |
char desc[1024]; |
690 |
const char *real_filename, *temp_str; |
691 |
int64_t total_size = 0;
|
692 |
const char *backing_file = NULL; |
693 |
int flags = 0; |
694 |
int ret;
|
695 |
|
696 |
// Read out options
|
697 |
while (options && options->name) {
|
698 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
699 |
total_size = options->value.n / 512;
|
700 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
701 |
backing_file = options->value.s; |
702 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
703 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
704 |
} |
705 |
options++; |
706 |
} |
707 |
|
708 |
/* XXX: add support for backing file */
|
709 |
if (backing_file) {
|
710 |
return vmdk_snapshot_create(filename, backing_file);
|
711 |
} |
712 |
|
713 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
714 |
0644);
|
715 |
if (fd < 0) |
716 |
return -errno;
|
717 |
magic = cpu_to_be32(VMDK4_MAGIC); |
718 |
memset(&header, 0, sizeof(header)); |
719 |
header.version = 1;
|
720 |
header.flags = 3; /* ?? */ |
721 |
header.capacity = total_size; |
722 |
header.granularity = 128;
|
723 |
header.num_gtes_per_gte = 512;
|
724 |
|
725 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
726 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
727 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
728 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
729 |
|
730 |
header.desc_offset = 1;
|
731 |
header.desc_size = 20;
|
732 |
header.rgd_offset = header.desc_offset + header.desc_size; |
733 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
734 |
header.grain_offset = |
735 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
736 |
header.granularity - 1) / header.granularity) *
|
737 |
header.granularity; |
738 |
|
739 |
/* swap endianness for all header fields */
|
740 |
header.version = cpu_to_le32(header.version); |
741 |
header.flags = cpu_to_le32(header.flags); |
742 |
header.capacity = cpu_to_le64(header.capacity); |
743 |
header.granularity = cpu_to_le64(header.granularity); |
744 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
745 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
746 |
header.desc_size = cpu_to_le64(header.desc_size); |
747 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
748 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
749 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
750 |
|
751 |
header.check_bytes[0] = 0xa; |
752 |
header.check_bytes[1] = 0x20; |
753 |
header.check_bytes[2] = 0xd; |
754 |
header.check_bytes[3] = 0xa; |
755 |
|
756 |
/* write all the data */
|
757 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
758 |
if (ret != sizeof(magic)) { |
759 |
ret = -errno; |
760 |
goto exit;
|
761 |
} |
762 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
763 |
if (ret != sizeof(header)) { |
764 |
ret = -errno; |
765 |
goto exit;
|
766 |
} |
767 |
|
768 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
769 |
if (ret < 0) { |
770 |
ret = -errno; |
771 |
goto exit;
|
772 |
} |
773 |
|
774 |
/* write grain directory */
|
775 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
776 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
777 |
i < gt_count; i++, tmp += gt_size) { |
778 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
779 |
if (ret != sizeof(tmp)) { |
780 |
ret = -errno; |
781 |
goto exit;
|
782 |
} |
783 |
} |
784 |
|
785 |
/* write backup grain directory */
|
786 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
787 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
788 |
i < gt_count; i++, tmp += gt_size) { |
789 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
790 |
if (ret != sizeof(tmp)) { |
791 |
ret = -errno; |
792 |
goto exit;
|
793 |
} |
794 |
} |
795 |
|
796 |
/* compose the descriptor */
|
797 |
real_filename = filename; |
798 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
799 |
real_filename = temp_str + 1;
|
800 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
801 |
real_filename = temp_str + 1;
|
802 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
803 |
real_filename = temp_str + 1;
|
804 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
805 |
total_size, real_filename, |
806 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
807 |
total_size / (int64_t)(63 * 16)); |
808 |
|
809 |
/* write the descriptor */
|
810 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
811 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
812 |
if (ret != strlen(desc)) {
|
813 |
ret = -errno; |
814 |
goto exit;
|
815 |
} |
816 |
|
817 |
ret = 0;
|
818 |
exit:
|
819 |
close(fd); |
820 |
return ret;
|
821 |
} |
822 |
|
823 |
static void vmdk_close(BlockDriverState *bs) |
824 |
{ |
825 |
BDRVVmdkState *s = bs->opaque; |
826 |
|
827 |
qemu_free(s->l1_table); |
828 |
qemu_free(s->l2_cache); |
829 |
} |
830 |
|
831 |
static int vmdk_flush(BlockDriverState *bs) |
832 |
{ |
833 |
return bdrv_flush(bs->file);
|
834 |
} |
835 |
|
836 |
|
837 |
static QEMUOptionParameter vmdk_create_options[] = {
|
838 |
{ |
839 |
.name = BLOCK_OPT_SIZE, |
840 |
.type = OPT_SIZE, |
841 |
.help = "Virtual disk size"
|
842 |
}, |
843 |
{ |
844 |
.name = BLOCK_OPT_BACKING_FILE, |
845 |
.type = OPT_STRING, |
846 |
.help = "File name of a base image"
|
847 |
}, |
848 |
{ |
849 |
.name = BLOCK_OPT_COMPAT6, |
850 |
.type = OPT_FLAG, |
851 |
.help = "VMDK version 6 image"
|
852 |
}, |
853 |
{ NULL }
|
854 |
}; |
855 |
|
856 |
static BlockDriver bdrv_vmdk = {
|
857 |
.format_name = "vmdk",
|
858 |
.instance_size = sizeof(BDRVVmdkState),
|
859 |
.bdrv_probe = vmdk_probe, |
860 |
.bdrv_open = vmdk_open, |
861 |
.bdrv_read = vmdk_read, |
862 |
.bdrv_write = vmdk_write, |
863 |
.bdrv_close = vmdk_close, |
864 |
.bdrv_create = vmdk_create, |
865 |
.bdrv_flush = vmdk_flush, |
866 |
.bdrv_is_allocated = vmdk_is_allocated, |
867 |
|
868 |
.create_options = vmdk_create_options, |
869 |
}; |
870 |
|
871 |
static void bdrv_vmdk_init(void) |
872 |
{ |
873 |
bdrv_register(&bdrv_vmdk); |
874 |
} |
875 |
|
876 |
block_init(bdrv_vmdk_init); |