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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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|
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#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') |
| 31 |
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') |
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|
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typedef struct { |
| 34 |
uint32_t version; |
| 35 |
uint32_t flags; |
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uint32_t disk_sectors; |
| 37 |
uint32_t granularity; |
| 38 |
uint32_t l1dir_offset; |
| 39 |
uint32_t l1dir_size; |
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uint32_t file_sectors; |
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uint32_t cylinders; |
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uint32_t heads; |
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uint32_t sectors_per_track; |
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} VMDK3Header; |
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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; |
| 50 |
int64_t granularity; |
| 51 |
int64_t desc_offset; |
| 52 |
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; |
| 57 |
char filler[1]; |
| 58 |
char check_bytes[4]; |
| 59 |
} __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 VmdkExtent { |
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BlockDriverState *file; |
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bool flat;
|
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int64_t sectors; |
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int64_t end_sector; |
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int64_t l1_table_offset; |
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int64_t l1_backup_table_offset; |
| 70 |
uint32_t *l1_table; |
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uint32_t *l1_backup_table; |
| 72 |
unsigned int l1_size; |
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uint32_t l1_entry_sectors; |
| 74 |
|
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unsigned int l2_size; |
| 76 |
uint32_t *l2_cache; |
| 77 |
uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
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uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
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|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
| 82 |
|
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typedef struct BDRVVmdkState { |
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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; |
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|
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static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 99 |
{
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uint32_t magic; |
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|
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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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return 0; |
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} |
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|
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#define CHECK_CID 1 |
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|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
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#define HEADER_SIZE 512 // first sector of 512 bytes |
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|
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static void vmdk_free_extents(BlockDriverState *bs) |
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{
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int i;
|
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BDRVVmdkState *s = bs->opaque; |
| 122 |
|
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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); |
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qemu_free(s->extents[i].l1_backup_table); |
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} |
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qemu_free(s->extents); |
| 129 |
} |
| 130 |
|
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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; |
| 136 |
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; |
| 141 |
|
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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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} |
| 149 |
|
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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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} |
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|
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return cid;
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} |
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|
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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) |
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return -1; |
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|
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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) { |
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p_name += sizeof("CID"); |
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snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
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pstrcat(desc, sizeof(desc), tmp_desc);
|
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} |
| 174 |
|
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if (bdrv_pwrite_sync(bs->file, 0x200, desc, DESC_SIZE) < 0) |
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return -1; |
| 177 |
return 0; |
| 178 |
} |
| 179 |
|
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static int vmdk_is_cid_valid(BlockDriverState *bs) |
| 181 |
{
|
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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; |
| 186 |
|
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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; |
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} |
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#endif
|
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// CID valid
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return 1; |
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} |
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|
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static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
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{
|
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int snp_fd, p_fd;
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int ret;
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uint32_t p_cid; |
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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; |
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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) |
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return -errno;
|
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p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
| 228 |
if (p_fd < 0) { |
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close(snp_fd); |
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return -errno;
|
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} |
| 232 |
|
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/* read the header */
|
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if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
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ret = -errno; |
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goto fail;
|
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} |
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if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
|
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ret = -errno; |
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goto fail;
|
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} |
| 242 |
|
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/* write the header */
|
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if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
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ret = -errno; |
| 246 |
goto fail;
|
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} |
| 248 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) { |
| 249 |
ret = -errno; |
| 250 |
goto fail;
|
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} |
| 252 |
|
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memset(&header, 0, sizeof(header)); |
| 254 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
| 255 |
|
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if (ftruncate(snp_fd, header.grain_offset << 9)) { |
| 257 |
ret = -errno; |
| 258 |
goto fail;
|
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} |
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/* the descriptor offset = 0x200 */
|
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if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
| 262 |
ret = -errno; |
| 263 |
goto fail;
|
| 264 |
} |
| 265 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
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ret = -errno; |
| 267 |
goto fail;
|
| 268 |
} |
| 269 |
|
| 270 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
| 271 |
p_name += sizeof("CID"); |
| 272 |
sscanf(p_name,"%x",&p_cid);
|
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} |
| 274 |
|
| 275 |
real_filename = filename; |
| 276 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
| 277 |
real_filename = temp_str + 1;
|
| 278 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
| 279 |
real_filename = temp_str + 1;
|
| 280 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
| 281 |
real_filename = temp_str + 1;
|
| 282 |
|
| 283 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
|
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(uint32_t)header.capacity, real_filename); |
| 285 |
|
| 286 |
/* write the descriptor */
|
| 287 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
| 288 |
ret = -errno; |
| 289 |
goto fail;
|
| 290 |
} |
| 291 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { |
| 292 |
ret = -errno; |
| 293 |
goto fail;
|
| 294 |
} |
| 295 |
|
| 296 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
| 297 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
| 298 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
| 299 |
/*
|
| 300 |
* Each GDE span 32M disk, means:
|
| 301 |
* 512 GTE per GT, each GTE points to grain
|
| 302 |
*/
|
| 303 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
| 304 |
if (!gt_size) {
|
| 305 |
ret = -EINVAL; |
| 306 |
goto fail;
|
| 307 |
} |
| 308 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
| 309 |
gd_size = gde_entries * sizeof(uint32_t);
|
| 310 |
|
| 311 |
/* write RGD */
|
| 312 |
rgd_buf = qemu_malloc(gd_size); |
| 313 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
| 314 |
ret = -errno; |
| 315 |
goto fail_rgd;
|
| 316 |
} |
| 317 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
| 318 |
ret = -errno; |
| 319 |
goto fail_rgd;
|
| 320 |
} |
| 321 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { |
| 322 |
ret = -errno; |
| 323 |
goto fail_rgd;
|
| 324 |
} |
| 325 |
if (write(snp_fd, rgd_buf, gd_size) == -1) { |
| 326 |
ret = -errno; |
| 327 |
goto fail_rgd;
|
| 328 |
} |
| 329 |
|
| 330 |
/* write GD */
|
| 331 |
gd_buf = qemu_malloc(gd_size); |
| 332 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
| 333 |
ret = -errno; |
| 334 |
goto fail_gd;
|
| 335 |
} |
| 336 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
| 337 |
ret = -errno; |
| 338 |
goto fail_gd;
|
| 339 |
} |
| 340 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { |
| 341 |
ret = -errno; |
| 342 |
goto fail_gd;
|
| 343 |
} |
| 344 |
if (write(snp_fd, gd_buf, gd_size) == -1) { |
| 345 |
ret = -errno; |
| 346 |
goto fail_gd;
|
| 347 |
} |
| 348 |
ret = 0;
|
| 349 |
|
| 350 |
fail_gd:
|
| 351 |
qemu_free(gd_buf); |
| 352 |
fail_rgd:
|
| 353 |
qemu_free(rgd_buf); |
| 354 |
fail:
|
| 355 |
close(p_fd); |
| 356 |
close(snp_fd); |
| 357 |
return ret;
|
| 358 |
} |
| 359 |
|
| 360 |
static int vmdk_parent_open(BlockDriverState *bs) |
| 361 |
{
|
| 362 |
char *p_name;
|
| 363 |
char desc[DESC_SIZE];
|
| 364 |
|
| 365 |
/* the descriptor offset = 0x200 */
|
| 366 |
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
| 367 |
return -1; |
| 368 |
|
| 369 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
| 370 |
char *end_name;
|
| 371 |
|
| 372 |
p_name += sizeof("parentFileNameHint") + 1; |
| 373 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
| 374 |
return -1; |
| 375 |
if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
| 376 |
return -1; |
| 377 |
|
| 378 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
| 379 |
} |
| 380 |
|
| 381 |
return 0; |
| 382 |
} |
| 383 |
|
| 384 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
| 385 |
* address. return NULL if allocation failed. */
|
| 386 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
| 387 |
BlockDriverState *file, bool flat, int64_t sectors,
|
| 388 |
int64_t l1_offset, int64_t l1_backup_offset, |
| 389 |
uint32_t l1_size, |
| 390 |
int l2_size, unsigned int cluster_sectors) |
| 391 |
{
|
| 392 |
VmdkExtent *extent; |
| 393 |
BDRVVmdkState *s = bs->opaque; |
| 394 |
|
| 395 |
s->extents = qemu_realloc(s->extents, |
| 396 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
| 397 |
extent = &s->extents[s->num_extents]; |
| 398 |
s->num_extents++; |
| 399 |
|
| 400 |
memset(extent, 0, sizeof(VmdkExtent)); |
| 401 |
extent->file = file; |
| 402 |
extent->flat = flat; |
| 403 |
extent->sectors = sectors; |
| 404 |
extent->l1_table_offset = l1_offset; |
| 405 |
extent->l1_backup_table_offset = l1_backup_offset; |
| 406 |
extent->l1_size = l1_size; |
| 407 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
| 408 |
extent->l2_size = l2_size; |
| 409 |
extent->cluster_sectors = cluster_sectors; |
| 410 |
|
| 411 |
if (s->num_extents > 1) { |
| 412 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
| 413 |
} else {
|
| 414 |
extent->end_sector = extent->sectors; |
| 415 |
} |
| 416 |
bs->total_sectors = extent->end_sector; |
| 417 |
return extent;
|
| 418 |
} |
| 419 |
|
| 420 |
|
| 421 |
static int vmdk_open(BlockDriverState *bs, int flags) |
| 422 |
{
|
| 423 |
BDRVVmdkState *s = bs->opaque; |
| 424 |
uint32_t magic; |
| 425 |
int i;
|
| 426 |
uint32_t l1_size, l1_entry_sectors; |
| 427 |
VmdkExtent *extent = NULL;
|
| 428 |
|
| 429 |
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) |
| 430 |
goto fail;
|
| 431 |
|
| 432 |
magic = be32_to_cpu(magic); |
| 433 |
if (magic == VMDK3_MAGIC) {
|
| 434 |
VMDK3Header header; |
| 435 |
if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) |
| 436 |
!= sizeof(header)) {
|
| 437 |
goto fail;
|
| 438 |
} |
| 439 |
extent = vmdk_add_extent(bs, bs->file, false,
|
| 440 |
le32_to_cpu(header.disk_sectors), |
| 441 |
le32_to_cpu(header.l1dir_offset) << 9, 0, |
| 442 |
1 << 6, 1 << 9, le32_to_cpu(header.granularity)); |
| 443 |
} else if (magic == VMDK4_MAGIC) { |
| 444 |
VMDK4Header header; |
| 445 |
if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) |
| 446 |
!= sizeof(header)) {
|
| 447 |
goto fail;
|
| 448 |
} |
| 449 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
| 450 |
* le64_to_cpu(header.granularity); |
| 451 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
| 452 |
/ l1_entry_sectors; |
| 453 |
extent = vmdk_add_extent(bs, bs->file, false,
|
| 454 |
le64_to_cpu(header.capacity), |
| 455 |
le64_to_cpu(header.gd_offset) << 9,
|
| 456 |
le64_to_cpu(header.rgd_offset) << 9,
|
| 457 |
l1_size, |
| 458 |
le32_to_cpu(header.num_gtes_per_gte), |
| 459 |
le64_to_cpu(header.granularity)); |
| 460 |
if (extent->l1_entry_sectors <= 0) { |
| 461 |
goto fail;
|
| 462 |
} |
| 463 |
// try to open parent images, if exist
|
| 464 |
if (vmdk_parent_open(bs) != 0) |
| 465 |
goto fail;
|
| 466 |
// write the CID once after the image creation
|
| 467 |
s->parent_cid = vmdk_read_cid(bs,1);
|
| 468 |
} else {
|
| 469 |
goto fail;
|
| 470 |
} |
| 471 |
|
| 472 |
/* read the L1 table */
|
| 473 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
| 474 |
extent->l1_table = qemu_malloc(l1_size); |
| 475 |
if (bdrv_pread(bs->file,
|
| 476 |
extent->l1_table_offset, |
| 477 |
extent->l1_table, |
| 478 |
l1_size) |
| 479 |
!= l1_size) {
|
| 480 |
goto fail;
|
| 481 |
} |
| 482 |
for (i = 0; i < extent->l1_size; i++) { |
| 483 |
le32_to_cpus(&extent->l1_table[i]); |
| 484 |
} |
| 485 |
|
| 486 |
if (extent->l1_backup_table_offset) {
|
| 487 |
extent->l1_backup_table = qemu_malloc(l1_size); |
| 488 |
if (bdrv_pread(bs->file,
|
| 489 |
extent->l1_backup_table_offset, |
| 490 |
extent->l1_backup_table, |
| 491 |
l1_size) |
| 492 |
!= l1_size) {
|
| 493 |
goto fail;
|
| 494 |
} |
| 495 |
for (i = 0; i < extent->l1_size; i++) { |
| 496 |
le32_to_cpus(&extent->l1_backup_table[i]); |
| 497 |
} |
| 498 |
} |
| 499 |
|
| 500 |
extent->l2_cache = |
| 501 |
qemu_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
| 502 |
return 0; |
| 503 |
fail:
|
| 504 |
vmdk_free_extents(bs); |
| 505 |
return -1; |
| 506 |
} |
| 507 |
|
| 508 |
static int get_whole_cluster(BlockDriverState *bs, |
| 509 |
VmdkExtent *extent, |
| 510 |
uint64_t cluster_offset, |
| 511 |
uint64_t offset, |
| 512 |
bool allocate)
|
| 513 |
{
|
| 514 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
| 515 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
| 516 |
|
| 517 |
/* we will be here if it's first write on non-exist grain(cluster).
|
| 518 |
* try to read from parent image, if exist */
|
| 519 |
if (bs->backing_hd) {
|
| 520 |
int ret;
|
| 521 |
|
| 522 |
if (!vmdk_is_cid_valid(bs))
|
| 523 |
return -1; |
| 524 |
|
| 525 |
/* floor offset to cluster */
|
| 526 |
offset -= offset % (extent->cluster_sectors * 512);
|
| 527 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
| 528 |
extent->cluster_sectors); |
| 529 |
if (ret < 0) { |
| 530 |
return -1; |
| 531 |
} |
| 532 |
|
| 533 |
/* Write grain only into the active image */
|
| 534 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
| 535 |
extent->cluster_sectors); |
| 536 |
if (ret < 0) { |
| 537 |
return -1; |
| 538 |
} |
| 539 |
} |
| 540 |
return 0; |
| 541 |
} |
| 542 |
|
| 543 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
| 544 |
{
|
| 545 |
/* update L2 table */
|
| 546 |
if (bdrv_pwrite_sync(
|
| 547 |
extent->file, |
| 548 |
((int64_t)m_data->l2_offset * 512)
|
| 549 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
| 550 |
&(m_data->offset), |
| 551 |
sizeof(m_data->offset)
|
| 552 |
) < 0) {
|
| 553 |
return -1; |
| 554 |
} |
| 555 |
/* update backup L2 table */
|
| 556 |
if (extent->l1_backup_table_offset != 0) { |
| 557 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
| 558 |
if (bdrv_pwrite_sync(
|
| 559 |
extent->file, |
| 560 |
((int64_t)m_data->l2_offset * 512)
|
| 561 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
| 562 |
&(m_data->offset), sizeof(m_data->offset)
|
| 563 |
) < 0) {
|
| 564 |
return -1; |
| 565 |
} |
| 566 |
} |
| 567 |
|
| 568 |
return 0; |
| 569 |
} |
| 570 |
|
| 571 |
static uint64_t get_cluster_offset(BlockDriverState *bs,
|
| 572 |
VmdkExtent *extent, |
| 573 |
VmdkMetaData *m_data, |
| 574 |
uint64_t offset, int allocate)
|
| 575 |
{
|
| 576 |
unsigned int l1_index, l2_offset, l2_index; |
| 577 |
int min_index, i, j;
|
| 578 |
uint32_t min_count, *l2_table, tmp = 0;
|
| 579 |
uint64_t cluster_offset; |
| 580 |
|
| 581 |
if (m_data)
|
| 582 |
m_data->valid = 0;
|
| 583 |
|
| 584 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
| 585 |
if (l1_index >= extent->l1_size) {
|
| 586 |
return 0; |
| 587 |
} |
| 588 |
l2_offset = extent->l1_table[l1_index]; |
| 589 |
if (!l2_offset) {
|
| 590 |
return 0; |
| 591 |
} |
| 592 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
| 593 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
| 594 |
/* increment the hit count */
|
| 595 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
| 596 |
for(j = 0; j < L2_CACHE_SIZE; j++) { |
| 597 |
extent->l2_cache_counts[j] >>= 1;
|
| 598 |
} |
| 599 |
} |
| 600 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
| 601 |
goto found;
|
| 602 |
} |
| 603 |
} |
| 604 |
/* not found: load a new entry in the least used one */
|
| 605 |
min_index = 0;
|
| 606 |
min_count = 0xffffffff;
|
| 607 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
| 608 |
if (extent->l2_cache_counts[i] < min_count) {
|
| 609 |
min_count = extent->l2_cache_counts[i]; |
| 610 |
min_index = i; |
| 611 |
} |
| 612 |
} |
| 613 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
| 614 |
if (bdrv_pread(
|
| 615 |
extent->file, |
| 616 |
(int64_t)l2_offset * 512,
|
| 617 |
l2_table, |
| 618 |
extent->l2_size * sizeof(uint32_t)
|
| 619 |
) != extent->l2_size * sizeof(uint32_t)) {
|
| 620 |
return 0; |
| 621 |
} |
| 622 |
|
| 623 |
extent->l2_cache_offsets[min_index] = l2_offset; |
| 624 |
extent->l2_cache_counts[min_index] = 1;
|
| 625 |
found:
|
| 626 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
| 627 |
cluster_offset = le32_to_cpu(l2_table[l2_index]); |
| 628 |
|
| 629 |
if (!cluster_offset) {
|
| 630 |
if (!allocate)
|
| 631 |
return 0; |
| 632 |
|
| 633 |
// Avoid the L2 tables update for the images that have snapshots.
|
| 634 |
cluster_offset = bdrv_getlength(extent->file); |
| 635 |
bdrv_truncate( |
| 636 |
extent->file, |
| 637 |
cluster_offset + (extent->cluster_sectors << 9)
|
| 638 |
); |
| 639 |
|
| 640 |
cluster_offset >>= 9;
|
| 641 |
tmp = cpu_to_le32(cluster_offset); |
| 642 |
l2_table[l2_index] = tmp; |
| 643 |
|
| 644 |
/* First of all we write grain itself, to avoid race condition
|
| 645 |
* that may to corrupt the image.
|
| 646 |
* This problem may occur because of insufficient space on host disk
|
| 647 |
* or inappropriate VM shutdown.
|
| 648 |
*/
|
| 649 |
if (get_whole_cluster(
|
| 650 |
bs, extent, cluster_offset, offset, allocate) == -1)
|
| 651 |
return 0; |
| 652 |
|
| 653 |
if (m_data) {
|
| 654 |
m_data->offset = tmp; |
| 655 |
m_data->l1_index = l1_index; |
| 656 |
m_data->l2_index = l2_index; |
| 657 |
m_data->l2_offset = l2_offset; |
| 658 |
m_data->valid = 1;
|
| 659 |
} |
| 660 |
} |
| 661 |
cluster_offset <<= 9;
|
| 662 |
return cluster_offset;
|
| 663 |
} |
| 664 |
|
| 665 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
| 666 |
int64_t sector_num, VmdkExtent *start_hint) |
| 667 |
{
|
| 668 |
VmdkExtent *extent = start_hint; |
| 669 |
|
| 670 |
if (!extent) {
|
| 671 |
extent = &s->extents[0];
|
| 672 |
} |
| 673 |
while (extent < &s->extents[s->num_extents]) {
|
| 674 |
if (sector_num < extent->end_sector) {
|
| 675 |
return extent;
|
| 676 |
} |
| 677 |
extent++; |
| 678 |
} |
| 679 |
return NULL; |
| 680 |
} |
| 681 |
|
| 682 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
| 683 |
int nb_sectors, int *pnum) |
| 684 |
{
|
| 685 |
BDRVVmdkState *s = bs->opaque; |
| 686 |
|
| 687 |
int64_t index_in_cluster, n, ret; |
| 688 |
uint64_t offset; |
| 689 |
VmdkExtent *extent; |
| 690 |
|
| 691 |
extent = find_extent(s, sector_num, NULL);
|
| 692 |
if (!extent) {
|
| 693 |
return 0; |
| 694 |
} |
| 695 |
if (extent->flat) {
|
| 696 |
n = extent->end_sector - sector_num; |
| 697 |
ret = 1;
|
| 698 |
} else {
|
| 699 |
offset = get_cluster_offset(bs, extent, NULL, sector_num * 512, 0); |
| 700 |
index_in_cluster = sector_num % extent->cluster_sectors; |
| 701 |
n = extent->cluster_sectors - index_in_cluster; |
| 702 |
ret = offset ? 1 : 0; |
| 703 |
} |
| 704 |
if (n > nb_sectors)
|
| 705 |
n = nb_sectors; |
| 706 |
*pnum = n; |
| 707 |
return ret;
|
| 708 |
} |
| 709 |
|
| 710 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
| 711 |
uint8_t *buf, int nb_sectors)
|
| 712 |
{
|
| 713 |
BDRVVmdkState *s = bs->opaque; |
| 714 |
int ret;
|
| 715 |
uint64_t n, index_in_cluster; |
| 716 |
VmdkExtent *extent = NULL;
|
| 717 |
uint64_t cluster_offset; |
| 718 |
|
| 719 |
while (nb_sectors > 0) { |
| 720 |
extent = find_extent(s, sector_num, extent); |
| 721 |
if (!extent) {
|
| 722 |
return -EIO;
|
| 723 |
} |
| 724 |
cluster_offset = get_cluster_offset( |
| 725 |
bs, extent, NULL, sector_num << 9, 0); |
| 726 |
index_in_cluster = sector_num % extent->cluster_sectors; |
| 727 |
n = extent->cluster_sectors - index_in_cluster; |
| 728 |
if (n > nb_sectors)
|
| 729 |
n = nb_sectors; |
| 730 |
if (!cluster_offset) {
|
| 731 |
// try to read from parent image, if exist
|
| 732 |
if (bs->backing_hd) {
|
| 733 |
if (!vmdk_is_cid_valid(bs))
|
| 734 |
return -1; |
| 735 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
| 736 |
if (ret < 0) |
| 737 |
return -1; |
| 738 |
} else {
|
| 739 |
memset(buf, 0, 512 * n); |
| 740 |
} |
| 741 |
} else {
|
| 742 |
if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
| 743 |
return -1; |
| 744 |
} |
| 745 |
nb_sectors -= n; |
| 746 |
sector_num += n; |
| 747 |
buf += n * 512;
|
| 748 |
} |
| 749 |
return 0; |
| 750 |
} |
| 751 |
|
| 752 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
| 753 |
const uint8_t *buf, int nb_sectors) |
| 754 |
{
|
| 755 |
BDRVVmdkState *s = bs->opaque; |
| 756 |
VmdkExtent *extent = NULL;
|
| 757 |
int n;
|
| 758 |
int64_t index_in_cluster; |
| 759 |
uint64_t cluster_offset; |
| 760 |
static int cid_update = 0; |
| 761 |
VmdkMetaData m_data; |
| 762 |
|
| 763 |
if (sector_num > bs->total_sectors) {
|
| 764 |
fprintf(stderr, |
| 765 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
| 766 |
" total_sectors=0x%" PRIx64 "\n", |
| 767 |
sector_num, bs->total_sectors); |
| 768 |
return -1; |
| 769 |
} |
| 770 |
|
| 771 |
while (nb_sectors > 0) { |
| 772 |
extent = find_extent(s, sector_num, extent); |
| 773 |
if (!extent) {
|
| 774 |
return -EIO;
|
| 775 |
} |
| 776 |
cluster_offset = get_cluster_offset( |
| 777 |
bs, |
| 778 |
extent, |
| 779 |
&m_data, |
| 780 |
sector_num << 9, 1); |
| 781 |
if (!cluster_offset) {
|
| 782 |
return -1; |
| 783 |
} |
| 784 |
index_in_cluster = sector_num % extent->cluster_sectors; |
| 785 |
n = extent->cluster_sectors - index_in_cluster; |
| 786 |
if (n > nb_sectors) {
|
| 787 |
n = nb_sectors; |
| 788 |
} |
| 789 |
|
| 790 |
if (bdrv_pwrite(bs->file,
|
| 791 |
cluster_offset + index_in_cluster * 512,
|
| 792 |
buf, n * 512)
|
| 793 |
!= n * 512) {
|
| 794 |
return -1; |
| 795 |
} |
| 796 |
if (m_data.valid) {
|
| 797 |
/* update L2 tables */
|
| 798 |
if (vmdk_L2update(extent, &m_data) == -1) { |
| 799 |
return -1; |
| 800 |
} |
| 801 |
} |
| 802 |
nb_sectors -= n; |
| 803 |
sector_num += n; |
| 804 |
buf += n * 512;
|
| 805 |
|
| 806 |
// update CID on the first write every time the virtual disk is opened
|
| 807 |
if (!cid_update) {
|
| 808 |
vmdk_write_cid(bs, time(NULL));
|
| 809 |
cid_update++; |
| 810 |
} |
| 811 |
} |
| 812 |
return 0; |
| 813 |
} |
| 814 |
|
| 815 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
| 816 |
{
|
| 817 |
int fd, i;
|
| 818 |
VMDK4Header header; |
| 819 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
| 820 |
static const char desc_template[] = |
| 821 |
"# Disk DescriptorFile\n"
|
| 822 |
"version=1\n"
|
| 823 |
"CID=%x\n"
|
| 824 |
"parentCID=ffffffff\n"
|
| 825 |
"createType=\"monolithicSparse\"\n"
|
| 826 |
"\n"
|
| 827 |
"# Extent description\n"
|
| 828 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
| 829 |
"\n"
|
| 830 |
"# The Disk Data Base \n"
|
| 831 |
"#DDB\n"
|
| 832 |
"\n"
|
| 833 |
"ddb.virtualHWVersion = \"%d\"\n"
|
| 834 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
| 835 |
"ddb.geometry.heads = \"16\"\n"
|
| 836 |
"ddb.geometry.sectors = \"63\"\n"
|
| 837 |
"ddb.adapterType = \"ide\"\n";
|
| 838 |
char desc[1024]; |
| 839 |
const char *real_filename, *temp_str; |
| 840 |
int64_t total_size = 0;
|
| 841 |
const char *backing_file = NULL; |
| 842 |
int flags = 0; |
| 843 |
int ret;
|
| 844 |
|
| 845 |
// Read out options
|
| 846 |
while (options && options->name) {
|
| 847 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
| 848 |
total_size = options->value.n / 512;
|
| 849 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
| 850 |
backing_file = options->value.s; |
| 851 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
| 852 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
| 853 |
} |
| 854 |
options++; |
| 855 |
} |
| 856 |
|
| 857 |
/* XXX: add support for backing file */
|
| 858 |
if (backing_file) {
|
| 859 |
return vmdk_snapshot_create(filename, backing_file);
|
| 860 |
} |
| 861 |
|
| 862 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
| 863 |
0644);
|
| 864 |
if (fd < 0) |
| 865 |
return -errno;
|
| 866 |
magic = cpu_to_be32(VMDK4_MAGIC); |
| 867 |
memset(&header, 0, sizeof(header)); |
| 868 |
header.version = 1;
|
| 869 |
header.flags = 3; /* ?? */ |
| 870 |
header.capacity = total_size; |
| 871 |
header.granularity = 128;
|
| 872 |
header.num_gtes_per_gte = 512;
|
| 873 |
|
| 874 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
| 875 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
| 876 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
| 877 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
| 878 |
|
| 879 |
header.desc_offset = 1;
|
| 880 |
header.desc_size = 20;
|
| 881 |
header.rgd_offset = header.desc_offset + header.desc_size; |
| 882 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
| 883 |
header.grain_offset = |
| 884 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
| 885 |
header.granularity - 1) / header.granularity) *
|
| 886 |
header.granularity; |
| 887 |
|
| 888 |
/* swap endianness for all header fields */
|
| 889 |
header.version = cpu_to_le32(header.version); |
| 890 |
header.flags = cpu_to_le32(header.flags); |
| 891 |
header.capacity = cpu_to_le64(header.capacity); |
| 892 |
header.granularity = cpu_to_le64(header.granularity); |
| 893 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
| 894 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
| 895 |
header.desc_size = cpu_to_le64(header.desc_size); |
| 896 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
| 897 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
| 898 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
| 899 |
|
| 900 |
header.check_bytes[0] = 0xa; |
| 901 |
header.check_bytes[1] = 0x20; |
| 902 |
header.check_bytes[2] = 0xd; |
| 903 |
header.check_bytes[3] = 0xa; |
| 904 |
|
| 905 |
/* write all the data */
|
| 906 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
| 907 |
if (ret != sizeof(magic)) { |
| 908 |
ret = -errno; |
| 909 |
goto exit;
|
| 910 |
} |
| 911 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
| 912 |
if (ret != sizeof(header)) { |
| 913 |
ret = -errno; |
| 914 |
goto exit;
|
| 915 |
} |
| 916 |
|
| 917 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
| 918 |
if (ret < 0) { |
| 919 |
ret = -errno; |
| 920 |
goto exit;
|
| 921 |
} |
| 922 |
|
| 923 |
/* write grain directory */
|
| 924 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
| 925 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
| 926 |
i < gt_count; i++, tmp += gt_size) {
|
| 927 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
| 928 |
if (ret != sizeof(tmp)) { |
| 929 |
ret = -errno; |
| 930 |
goto exit;
|
| 931 |
} |
| 932 |
} |
| 933 |
|
| 934 |
/* write backup grain directory */
|
| 935 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
| 936 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
| 937 |
i < gt_count; i++, tmp += gt_size) {
|
| 938 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
| 939 |
if (ret != sizeof(tmp)) { |
| 940 |
ret = -errno; |
| 941 |
goto exit;
|
| 942 |
} |
| 943 |
} |
| 944 |
|
| 945 |
/* compose the descriptor */
|
| 946 |
real_filename = filename; |
| 947 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
| 948 |
real_filename = temp_str + 1;
|
| 949 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
| 950 |
real_filename = temp_str + 1;
|
| 951 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
| 952 |
real_filename = temp_str + 1;
|
| 953 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
| 954 |
total_size, real_filename, |
| 955 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
| 956 |
total_size / (int64_t)(63 * 16)); |
| 957 |
|
| 958 |
/* write the descriptor */
|
| 959 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
| 960 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
| 961 |
if (ret != strlen(desc)) {
|
| 962 |
ret = -errno; |
| 963 |
goto exit;
|
| 964 |
} |
| 965 |
|
| 966 |
ret = 0;
|
| 967 |
exit:
|
| 968 |
close(fd); |
| 969 |
return ret;
|
| 970 |
} |
| 971 |
|
| 972 |
static void vmdk_close(BlockDriverState *bs) |
| 973 |
{
|
| 974 |
vmdk_free_extents(bs); |
| 975 |
} |
| 976 |
|
| 977 |
static int vmdk_flush(BlockDriverState *bs) |
| 978 |
{
|
| 979 |
return bdrv_flush(bs->file);
|
| 980 |
} |
| 981 |
|
| 982 |
|
| 983 |
static QEMUOptionParameter vmdk_create_options[] = {
|
| 984 |
{
|
| 985 |
.name = BLOCK_OPT_SIZE, |
| 986 |
.type = OPT_SIZE, |
| 987 |
.help = "Virtual disk size"
|
| 988 |
}, |
| 989 |
{
|
| 990 |
.name = BLOCK_OPT_BACKING_FILE, |
| 991 |
.type = OPT_STRING, |
| 992 |
.help = "File name of a base image"
|
| 993 |
}, |
| 994 |
{
|
| 995 |
.name = BLOCK_OPT_COMPAT6, |
| 996 |
.type = OPT_FLAG, |
| 997 |
.help = "VMDK version 6 image"
|
| 998 |
}, |
| 999 |
{ NULL }
|
| 1000 |
}; |
| 1001 |
|
| 1002 |
static BlockDriver bdrv_vmdk = {
|
| 1003 |
.format_name = "vmdk",
|
| 1004 |
.instance_size = sizeof(BDRVVmdkState),
|
| 1005 |
.bdrv_probe = vmdk_probe, |
| 1006 |
.bdrv_open = vmdk_open, |
| 1007 |
.bdrv_read = vmdk_read, |
| 1008 |
.bdrv_write = vmdk_write, |
| 1009 |
.bdrv_close = vmdk_close, |
| 1010 |
.bdrv_create = vmdk_create, |
| 1011 |
.bdrv_flush = vmdk_flush, |
| 1012 |
.bdrv_is_allocated = vmdk_is_allocated, |
| 1013 |
|
| 1014 |
.create_options = vmdk_create_options, |
| 1015 |
}; |
| 1016 |
|
| 1017 |
static void bdrv_vmdk_init(void) |
| 1018 |
{
|
| 1019 |
bdrv_register(&bdrv_vmdk); |
| 1020 |
} |
| 1021 |
|
| 1022 |
block_init(bdrv_vmdk_init); |