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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') |
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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; |
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uint32_t file_sectors; |
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uint32_t cylinders; |
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uint32_t heads; |
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uint32_t sectors_per_track; |
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} VMDK3Header; |
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|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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int64_t capacity; |
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int64_t granularity; |
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int64_t desc_offset; |
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int64_t desc_size; |
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int32_t num_gtes_per_gte; |
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int64_t rgd_offset; |
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int64_t gd_offset; |
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int64_t grain_offset; |
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char filler[1]; |
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char check_bytes[4]; |
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} __attribute__((packed)) VMDK4Header; |
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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; |
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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; |
74 |
|
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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]; |
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|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
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|
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typedef struct BDRVVmdkState { |
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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; |
89 |
|
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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; |
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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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} |
111 |
|
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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); |
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} |
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|
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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; |
137 |
|
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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"); |
145 |
} else {
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cid_str = "CID";
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cid_str_size = sizeof("CID"); |
148 |
} |
149 |
|
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if ((p_name = strstr(desc,cid_str)) != NULL) { |
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p_name += cid_str_size; |
152 |
sscanf(p_name,"%x",&cid);
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} |
154 |
|
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return cid;
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} |
157 |
|
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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; |
166 |
|
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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"); |
171 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
172 |
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; |
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return 0; |
178 |
} |
179 |
|
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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; |
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|
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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; |
196 |
} |
197 |
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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) { |
235 |
ret = -errno; |
236 |
goto fail;
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} |
238 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
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ret = -errno; |
240 |
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) { |
245 |
ret = -errno; |
246 |
goto fail;
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247 |
} |
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 |
/*
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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 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
526 |
extent->cluster_sectors); |
527 |
if (ret < 0) { |
528 |
return -1; |
529 |
} |
530 |
|
531 |
//Write grain only into the active image
|
532 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
533 |
extent->cluster_sectors); |
534 |
if (ret < 0) { |
535 |
return -1; |
536 |
} |
537 |
} |
538 |
return 0; |
539 |
} |
540 |
|
541 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
542 |
{ |
543 |
/* update L2 table */
|
544 |
if (bdrv_pwrite_sync(
|
545 |
extent->file, |
546 |
((int64_t)m_data->l2_offset * 512)
|
547 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
548 |
&(m_data->offset), |
549 |
sizeof(m_data->offset)
|
550 |
) < 0) {
|
551 |
return -1; |
552 |
} |
553 |
/* update backup L2 table */
|
554 |
if (extent->l1_backup_table_offset != 0) { |
555 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
556 |
if (bdrv_pwrite_sync(
|
557 |
extent->file, |
558 |
((int64_t)m_data->l2_offset * 512)
|
559 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
560 |
&(m_data->offset), sizeof(m_data->offset)
|
561 |
) < 0) {
|
562 |
return -1; |
563 |
} |
564 |
} |
565 |
|
566 |
return 0; |
567 |
} |
568 |
|
569 |
static uint64_t get_cluster_offset(BlockDriverState *bs,
|
570 |
VmdkExtent *extent, |
571 |
VmdkMetaData *m_data, |
572 |
uint64_t offset, int allocate)
|
573 |
{ |
574 |
unsigned int l1_index, l2_offset, l2_index; |
575 |
int min_index, i, j;
|
576 |
uint32_t min_count, *l2_table, tmp = 0;
|
577 |
uint64_t cluster_offset; |
578 |
|
579 |
if (m_data)
|
580 |
m_data->valid = 0;
|
581 |
|
582 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
583 |
if (l1_index >= extent->l1_size) {
|
584 |
return 0; |
585 |
} |
586 |
l2_offset = extent->l1_table[l1_index]; |
587 |
if (!l2_offset) {
|
588 |
return 0; |
589 |
} |
590 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
591 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
592 |
/* increment the hit count */
|
593 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
594 |
for(j = 0; j < L2_CACHE_SIZE; j++) { |
595 |
extent->l2_cache_counts[j] >>= 1;
|
596 |
} |
597 |
} |
598 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
599 |
goto found;
|
600 |
} |
601 |
} |
602 |
/* not found: load a new entry in the least used one */
|
603 |
min_index = 0;
|
604 |
min_count = 0xffffffff;
|
605 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
606 |
if (extent->l2_cache_counts[i] < min_count) {
|
607 |
min_count = extent->l2_cache_counts[i]; |
608 |
min_index = i; |
609 |
} |
610 |
} |
611 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
612 |
if (bdrv_pread(
|
613 |
extent->file, |
614 |
(int64_t)l2_offset * 512,
|
615 |
l2_table, |
616 |
extent->l2_size * sizeof(uint32_t)
|
617 |
) != extent->l2_size * sizeof(uint32_t)) {
|
618 |
return 0; |
619 |
} |
620 |
|
621 |
extent->l2_cache_offsets[min_index] = l2_offset; |
622 |
extent->l2_cache_counts[min_index] = 1;
|
623 |
found:
|
624 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
625 |
cluster_offset = le32_to_cpu(l2_table[l2_index]); |
626 |
|
627 |
if (!cluster_offset) {
|
628 |
if (!allocate)
|
629 |
return 0; |
630 |
|
631 |
// Avoid the L2 tables update for the images that have snapshots.
|
632 |
cluster_offset = bdrv_getlength(extent->file); |
633 |
bdrv_truncate( |
634 |
extent->file, |
635 |
cluster_offset + (extent->cluster_sectors << 9)
|
636 |
); |
637 |
|
638 |
cluster_offset >>= 9;
|
639 |
tmp = cpu_to_le32(cluster_offset); |
640 |
l2_table[l2_index] = tmp; |
641 |
|
642 |
/* First of all we write grain itself, to avoid race condition
|
643 |
* that may to corrupt the image.
|
644 |
* This problem may occur because of insufficient space on host disk
|
645 |
* or inappropriate VM shutdown.
|
646 |
*/
|
647 |
if (get_whole_cluster(
|
648 |
bs, extent, cluster_offset, offset, allocate) == -1)
|
649 |
return 0; |
650 |
|
651 |
if (m_data) {
|
652 |
m_data->offset = tmp; |
653 |
m_data->l1_index = l1_index; |
654 |
m_data->l2_index = l2_index; |
655 |
m_data->l2_offset = l2_offset; |
656 |
m_data->valid = 1;
|
657 |
} |
658 |
} |
659 |
cluster_offset <<= 9;
|
660 |
return cluster_offset;
|
661 |
} |
662 |
|
663 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
664 |
int64_t sector_num, VmdkExtent *start_hint) |
665 |
{ |
666 |
VmdkExtent *extent = start_hint; |
667 |
|
668 |
if (!extent) {
|
669 |
extent = &s->extents[0];
|
670 |
} |
671 |
while (extent < &s->extents[s->num_extents]) {
|
672 |
if (sector_num < extent->end_sector) {
|
673 |
return extent;
|
674 |
} |
675 |
extent++; |
676 |
} |
677 |
return NULL; |
678 |
} |
679 |
|
680 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
681 |
int nb_sectors, int *pnum) |
682 |
{ |
683 |
BDRVVmdkState *s = bs->opaque; |
684 |
|
685 |
int64_t index_in_cluster, n, ret; |
686 |
uint64_t offset; |
687 |
VmdkExtent *extent; |
688 |
|
689 |
extent = find_extent(s, sector_num, NULL);
|
690 |
if (!extent) {
|
691 |
return 0; |
692 |
} |
693 |
if (extent->flat) {
|
694 |
n = extent->end_sector - sector_num; |
695 |
ret = 1;
|
696 |
} else {
|
697 |
offset = get_cluster_offset(bs, extent, NULL, sector_num * 512, 0); |
698 |
index_in_cluster = sector_num % extent->cluster_sectors; |
699 |
n = extent->cluster_sectors - index_in_cluster; |
700 |
ret = offset ? 1 : 0; |
701 |
} |
702 |
if (n > nb_sectors)
|
703 |
n = nb_sectors; |
704 |
*pnum = n; |
705 |
return ret;
|
706 |
} |
707 |
|
708 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
709 |
uint8_t *buf, int nb_sectors)
|
710 |
{ |
711 |
BDRVVmdkState *s = bs->opaque; |
712 |
int ret;
|
713 |
uint64_t n, index_in_cluster; |
714 |
VmdkExtent *extent = NULL;
|
715 |
uint64_t cluster_offset; |
716 |
|
717 |
while (nb_sectors > 0) { |
718 |
extent = find_extent(s, sector_num, extent); |
719 |
if (!extent) {
|
720 |
return -EIO;
|
721 |
} |
722 |
cluster_offset = get_cluster_offset( |
723 |
bs, extent, NULL, sector_num << 9, 0); |
724 |
index_in_cluster = sector_num % extent->cluster_sectors; |
725 |
n = extent->cluster_sectors - index_in_cluster; |
726 |
if (n > nb_sectors)
|
727 |
n = nb_sectors; |
728 |
if (!cluster_offset) {
|
729 |
// try to read from parent image, if exist
|
730 |
if (bs->backing_hd) {
|
731 |
if (!vmdk_is_cid_valid(bs))
|
732 |
return -1; |
733 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
734 |
if (ret < 0) |
735 |
return -1; |
736 |
} else {
|
737 |
memset(buf, 0, 512 * n); |
738 |
} |
739 |
} else {
|
740 |
if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
741 |
return -1; |
742 |
} |
743 |
nb_sectors -= n; |
744 |
sector_num += n; |
745 |
buf += n * 512;
|
746 |
} |
747 |
return 0; |
748 |
} |
749 |
|
750 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
751 |
const uint8_t *buf, int nb_sectors) |
752 |
{ |
753 |
BDRVVmdkState *s = bs->opaque; |
754 |
VmdkExtent *extent = NULL;
|
755 |
int n;
|
756 |
int64_t index_in_cluster; |
757 |
uint64_t cluster_offset; |
758 |
static int cid_update = 0; |
759 |
VmdkMetaData m_data; |
760 |
|
761 |
if (sector_num > bs->total_sectors) {
|
762 |
fprintf(stderr, |
763 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
764 |
" total_sectors=0x%" PRIx64 "\n", |
765 |
sector_num, bs->total_sectors); |
766 |
return -1; |
767 |
} |
768 |
|
769 |
while (nb_sectors > 0) { |
770 |
extent = find_extent(s, sector_num, extent); |
771 |
if (!extent) {
|
772 |
return -EIO;
|
773 |
} |
774 |
cluster_offset = get_cluster_offset( |
775 |
bs, |
776 |
extent, |
777 |
&m_data, |
778 |
sector_num << 9, 1); |
779 |
if (!cluster_offset) {
|
780 |
return -1; |
781 |
} |
782 |
index_in_cluster = sector_num % extent->cluster_sectors; |
783 |
n = extent->cluster_sectors - index_in_cluster; |
784 |
if (n > nb_sectors) {
|
785 |
n = nb_sectors; |
786 |
} |
787 |
|
788 |
if (bdrv_pwrite(bs->file,
|
789 |
cluster_offset + index_in_cluster * 512,
|
790 |
buf, n * 512)
|
791 |
!= n * 512) {
|
792 |
return -1; |
793 |
} |
794 |
if (m_data.valid) {
|
795 |
/* update L2 tables */
|
796 |
if (vmdk_L2update(extent, &m_data) == -1) { |
797 |
return -1; |
798 |
} |
799 |
} |
800 |
nb_sectors -= n; |
801 |
sector_num += n; |
802 |
buf += n * 512;
|
803 |
|
804 |
// update CID on the first write every time the virtual disk is opened
|
805 |
if (!cid_update) {
|
806 |
vmdk_write_cid(bs, time(NULL));
|
807 |
cid_update++; |
808 |
} |
809 |
} |
810 |
return 0; |
811 |
} |
812 |
|
813 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
814 |
{ |
815 |
int fd, i;
|
816 |
VMDK4Header header; |
817 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
818 |
static const char desc_template[] = |
819 |
"# Disk DescriptorFile\n"
|
820 |
"version=1\n"
|
821 |
"CID=%x\n"
|
822 |
"parentCID=ffffffff\n"
|
823 |
"createType=\"monolithicSparse\"\n"
|
824 |
"\n"
|
825 |
"# Extent description\n"
|
826 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
827 |
"\n"
|
828 |
"# The Disk Data Base \n"
|
829 |
"#DDB\n"
|
830 |
"\n"
|
831 |
"ddb.virtualHWVersion = \"%d\"\n"
|
832 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
833 |
"ddb.geometry.heads = \"16\"\n"
|
834 |
"ddb.geometry.sectors = \"63\"\n"
|
835 |
"ddb.adapterType = \"ide\"\n";
|
836 |
char desc[1024]; |
837 |
const char *real_filename, *temp_str; |
838 |
int64_t total_size = 0;
|
839 |
const char *backing_file = NULL; |
840 |
int flags = 0; |
841 |
int ret;
|
842 |
|
843 |
// Read out options
|
844 |
while (options && options->name) {
|
845 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
846 |
total_size = options->value.n / 512;
|
847 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
848 |
backing_file = options->value.s; |
849 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
850 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
851 |
} |
852 |
options++; |
853 |
} |
854 |
|
855 |
/* XXX: add support for backing file */
|
856 |
if (backing_file) {
|
857 |
return vmdk_snapshot_create(filename, backing_file);
|
858 |
} |
859 |
|
860 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
861 |
0644);
|
862 |
if (fd < 0) |
863 |
return -errno;
|
864 |
magic = cpu_to_be32(VMDK4_MAGIC); |
865 |
memset(&header, 0, sizeof(header)); |
866 |
header.version = 1;
|
867 |
header.flags = 3; /* ?? */ |
868 |
header.capacity = total_size; |
869 |
header.granularity = 128;
|
870 |
header.num_gtes_per_gte = 512;
|
871 |
|
872 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
873 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
874 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
875 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
876 |
|
877 |
header.desc_offset = 1;
|
878 |
header.desc_size = 20;
|
879 |
header.rgd_offset = header.desc_offset + header.desc_size; |
880 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
881 |
header.grain_offset = |
882 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
883 |
header.granularity - 1) / header.granularity) *
|
884 |
header.granularity; |
885 |
|
886 |
/* swap endianness for all header fields */
|
887 |
header.version = cpu_to_le32(header.version); |
888 |
header.flags = cpu_to_le32(header.flags); |
889 |
header.capacity = cpu_to_le64(header.capacity); |
890 |
header.granularity = cpu_to_le64(header.granularity); |
891 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
892 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
893 |
header.desc_size = cpu_to_le64(header.desc_size); |
894 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
895 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
896 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
897 |
|
898 |
header.check_bytes[0] = 0xa; |
899 |
header.check_bytes[1] = 0x20; |
900 |
header.check_bytes[2] = 0xd; |
901 |
header.check_bytes[3] = 0xa; |
902 |
|
903 |
/* write all the data */
|
904 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
905 |
if (ret != sizeof(magic)) { |
906 |
ret = -errno; |
907 |
goto exit;
|
908 |
} |
909 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
910 |
if (ret != sizeof(header)) { |
911 |
ret = -errno; |
912 |
goto exit;
|
913 |
} |
914 |
|
915 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
916 |
if (ret < 0) { |
917 |
ret = -errno; |
918 |
goto exit;
|
919 |
} |
920 |
|
921 |
/* write grain directory */
|
922 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
923 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
924 |
i < gt_count; i++, tmp += gt_size) { |
925 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
926 |
if (ret != sizeof(tmp)) { |
927 |
ret = -errno; |
928 |
goto exit;
|
929 |
} |
930 |
} |
931 |
|
932 |
/* write backup grain directory */
|
933 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
934 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
935 |
i < gt_count; i++, tmp += gt_size) { |
936 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
937 |
if (ret != sizeof(tmp)) { |
938 |
ret = -errno; |
939 |
goto exit;
|
940 |
} |
941 |
} |
942 |
|
943 |
/* compose the descriptor */
|
944 |
real_filename = filename; |
945 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
946 |
real_filename = temp_str + 1;
|
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 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
952 |
total_size, real_filename, |
953 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
954 |
total_size / (int64_t)(63 * 16)); |
955 |
|
956 |
/* write the descriptor */
|
957 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
958 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
959 |
if (ret != strlen(desc)) {
|
960 |
ret = -errno; |
961 |
goto exit;
|
962 |
} |
963 |
|
964 |
ret = 0;
|
965 |
exit:
|
966 |
close(fd); |
967 |
return ret;
|
968 |
} |
969 |
|
970 |
static void vmdk_close(BlockDriverState *bs) |
971 |
{ |
972 |
vmdk_free_extents(bs); |
973 |
} |
974 |
|
975 |
static int vmdk_flush(BlockDriverState *bs) |
976 |
{ |
977 |
return bdrv_flush(bs->file);
|
978 |
} |
979 |
|
980 |
|
981 |
static QEMUOptionParameter vmdk_create_options[] = {
|
982 |
{ |
983 |
.name = BLOCK_OPT_SIZE, |
984 |
.type = OPT_SIZE, |
985 |
.help = "Virtual disk size"
|
986 |
}, |
987 |
{ |
988 |
.name = BLOCK_OPT_BACKING_FILE, |
989 |
.type = OPT_STRING, |
990 |
.help = "File name of a base image"
|
991 |
}, |
992 |
{ |
993 |
.name = BLOCK_OPT_COMPAT6, |
994 |
.type = OPT_FLAG, |
995 |
.help = "VMDK version 6 image"
|
996 |
}, |
997 |
{ NULL }
|
998 |
}; |
999 |
|
1000 |
static BlockDriver bdrv_vmdk = {
|
1001 |
.format_name = "vmdk",
|
1002 |
.instance_size = sizeof(BDRVVmdkState),
|
1003 |
.bdrv_probe = vmdk_probe, |
1004 |
.bdrv_open = vmdk_open, |
1005 |
.bdrv_read = vmdk_read, |
1006 |
.bdrv_write = vmdk_write, |
1007 |
.bdrv_close = vmdk_close, |
1008 |
.bdrv_create = vmdk_create, |
1009 |
.bdrv_flush = vmdk_flush, |
1010 |
.bdrv_is_allocated = vmdk_is_allocated, |
1011 |
|
1012 |
.create_options = vmdk_create_options, |
1013 |
}; |
1014 |
|
1015 |
static void bdrv_vmdk_init(void) |
1016 |
{ |
1017 |
bdrv_register(&bdrv_vmdk); |
1018 |
} |
1019 |
|
1020 |
block_init(bdrv_vmdk_init); |