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/*
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* Block driver for the VMDK format
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*
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* Copyright (c) 2004 Fabrice Bellard
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* Copyright (c) 2005 Filip Navara
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
27 |
#include "block/block_int.h" |
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#include "module.h" |
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#include "migration.h" |
30 |
#include <zlib.h> |
31 |
|
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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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#define VMDK4_COMPRESSION_DEFLATE 1 |
35 |
#define VMDK4_FLAG_RGD (1 << 1) |
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#define VMDK4_FLAG_COMPRESS (1 << 16) |
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#define VMDK4_FLAG_MARKER (1 << 17) |
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#define VMDK4_GD_AT_END 0xffffffffffffffffULL |
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|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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uint32_t disk_sectors; |
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uint32_t granularity; |
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uint32_t l1dir_offset; |
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uint32_t l1dir_size; |
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uint32_t file_sectors; |
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uint32_t cylinders; |
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uint32_t heads; |
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uint32_t sectors_per_track; |
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} VMDK3Header; |
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|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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int64_t capacity; |
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int64_t granularity; |
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int64_t desc_offset; |
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int64_t desc_size; |
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int32_t num_gtes_per_gte; |
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int64_t rgd_offset; |
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int64_t gd_offset; |
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int64_t grain_offset; |
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char filler[1]; |
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char check_bytes[4]; |
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uint16_t compressAlgorithm; |
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} QEMU_PACKED VMDK4Header; |
68 |
|
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#define L2_CACHE_SIZE 16 |
70 |
|
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typedef struct VmdkExtent { |
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BlockDriverState *file; |
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bool flat;
|
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bool compressed;
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bool has_marker;
|
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int64_t sectors; |
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int64_t end_sector; |
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int64_t flat_start_offset; |
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int64_t l1_table_offset; |
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int64_t l1_backup_table_offset; |
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uint32_t *l1_table; |
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uint32_t *l1_backup_table; |
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unsigned int l1_size; |
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uint32_t l1_entry_sectors; |
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|
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unsigned int l2_size; |
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uint32_t *l2_cache; |
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uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
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uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
90 |
|
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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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CoMutex lock; |
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int desc_offset;
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bool cid_updated;
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uint32_t parent_cid; |
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int num_extents;
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/* Extent array with num_extents entries, ascend ordered by address */
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VmdkExtent *extents; |
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Error *migration_blocker; |
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} BDRVVmdkState; |
104 |
|
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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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typedef struct VmdkGrainMarker { |
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uint64_t lba; |
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uint32_t size; |
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uint8_t data[0];
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} VmdkGrainMarker; |
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|
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enum {
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MARKER_END_OF_STREAM = 0,
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MARKER_GRAIN_TABLE = 1,
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MARKER_GRAIN_DIRECTORY = 2,
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MARKER_FOOTER = 3,
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}; |
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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; |
129 |
|
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if (buf_size < 4) { |
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return 0; |
132 |
} |
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magic = be32_to_cpu(*(uint32_t *)buf); |
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if (magic == VMDK3_MAGIC ||
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magic == VMDK4_MAGIC) { |
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return 100; |
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} else {
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const char *p = (const char *)buf; |
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const char *end = p + buf_size; |
140 |
while (p < end) {
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if (*p == '#') { |
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/* skip comment line */
|
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while (p < end && *p != '\n') { |
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p++; |
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} |
146 |
p++; |
147 |
continue;
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} |
149 |
if (*p == ' ') { |
150 |
while (p < end && *p == ' ') { |
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p++; |
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} |
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/* skip '\r' if windows line endings used. */
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if (p < end && *p == '\r') { |
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p++; |
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} |
157 |
/* only accept blank lines before 'version=' line */
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if (p == end || *p != '\n') { |
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return 0; |
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} |
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p++; |
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continue;
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} |
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if (end - p >= strlen("version=X\n")) { |
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if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || |
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strncmp("version=2\n", p, strlen("version=2\n")) == 0) { |
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return 100; |
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} |
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} |
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if (end - p >= strlen("version=X\r\n")) { |
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if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || |
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strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { |
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return 100; |
174 |
} |
175 |
} |
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return 0; |
177 |
} |
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return 0; |
179 |
} |
180 |
} |
181 |
|
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#define CHECK_CID 1 |
183 |
|
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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 BUF_SIZE 4096 |
187 |
#define HEADER_SIZE 512 /* first sector of 512 bytes */ |
188 |
|
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static void vmdk_free_extents(BlockDriverState *bs) |
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{ |
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int i;
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BDRVVmdkState *s = bs->opaque; |
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VmdkExtent *e; |
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|
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for (i = 0; i < s->num_extents; i++) { |
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e = &s->extents[i]; |
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g_free(e->l1_table); |
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g_free(e->l2_cache); |
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g_free(e->l1_backup_table); |
200 |
if (e->file != bs->file) {
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bdrv_delete(e->file); |
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} |
203 |
} |
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g_free(s->extents); |
205 |
} |
206 |
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static void vmdk_free_last_extent(BlockDriverState *bs) |
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{ |
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BDRVVmdkState *s = bs->opaque; |
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if (s->num_extents == 0) { |
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return;
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} |
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s->num_extents--; |
215 |
s->extents = g_realloc(s->extents, s->num_extents * sizeof(VmdkExtent));
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} |
217 |
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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 = 0xffffffff;
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const char *p_name, *cid_str; |
223 |
size_t cid_str_size; |
224 |
BDRVVmdkState *s = bs->opaque; |
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int ret;
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ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
228 |
if (ret < 0) { |
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return 0; |
230 |
} |
231 |
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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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desc[DESC_SIZE - 1] = '\0'; |
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p_name = strstr(desc, cid_str); |
242 |
if (p_name != NULL) { |
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p_name += cid_str_size; |
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sscanf(p_name, "%x", &cid);
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} |
246 |
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return cid;
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} |
249 |
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
251 |
{ |
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char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
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char *p_name, *tmp_str;
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BDRVVmdkState *s = bs->opaque; |
255 |
int ret;
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256 |
|
257 |
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
258 |
if (ret < 0) { |
259 |
return ret;
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260 |
} |
261 |
|
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desc[DESC_SIZE - 1] = '\0'; |
263 |
tmp_str = strstr(desc, "parentCID");
|
264 |
if (tmp_str == NULL) { |
265 |
return -EINVAL;
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} |
267 |
|
268 |
pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
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p_name = strstr(desc, "CID");
|
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if (p_name != NULL) { |
271 |
p_name += sizeof("CID"); |
272 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
273 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
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} |
275 |
|
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ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); |
277 |
if (ret < 0) { |
278 |
return ret;
|
279 |
} |
280 |
|
281 |
return 0; |
282 |
} |
283 |
|
284 |
static int vmdk_is_cid_valid(BlockDriverState *bs) |
285 |
{ |
286 |
#ifdef CHECK_CID
|
287 |
BDRVVmdkState *s = bs->opaque; |
288 |
BlockDriverState *p_bs = bs->backing_hd; |
289 |
uint32_t cur_pcid; |
290 |
|
291 |
if (p_bs) {
|
292 |
cur_pcid = vmdk_read_cid(p_bs, 0);
|
293 |
if (s->parent_cid != cur_pcid) {
|
294 |
/* CID not valid */
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295 |
return 0; |
296 |
} |
297 |
} |
298 |
#endif
|
299 |
/* CID valid */
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300 |
return 1; |
301 |
} |
302 |
|
303 |
/* Queue extents, if any, for reopen() */
|
304 |
static int vmdk_reopen_prepare(BDRVReopenState *state, |
305 |
BlockReopenQueue *queue, Error **errp) |
306 |
{ |
307 |
BDRVVmdkState *s; |
308 |
int ret = -1; |
309 |
int i;
|
310 |
VmdkExtent *e; |
311 |
|
312 |
assert(state != NULL);
|
313 |
assert(state->bs != NULL);
|
314 |
|
315 |
if (queue == NULL) { |
316 |
error_set(errp, ERROR_CLASS_GENERIC_ERROR, |
317 |
"No reopen queue for VMDK extents");
|
318 |
goto exit;
|
319 |
} |
320 |
|
321 |
s = state->bs->opaque; |
322 |
|
323 |
assert(s != NULL);
|
324 |
|
325 |
for (i = 0; i < s->num_extents; i++) { |
326 |
e = &s->extents[i]; |
327 |
if (e->file != state->bs->file) {
|
328 |
bdrv_reopen_queue(queue, e->file, state->flags); |
329 |
} |
330 |
} |
331 |
ret = 0;
|
332 |
|
333 |
exit:
|
334 |
return ret;
|
335 |
} |
336 |
|
337 |
static int vmdk_parent_open(BlockDriverState *bs) |
338 |
{ |
339 |
char *p_name;
|
340 |
char desc[DESC_SIZE + 1]; |
341 |
BDRVVmdkState *s = bs->opaque; |
342 |
int ret;
|
343 |
|
344 |
desc[DESC_SIZE] = '\0';
|
345 |
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
346 |
if (ret < 0) { |
347 |
return ret;
|
348 |
} |
349 |
|
350 |
p_name = strstr(desc, "parentFileNameHint");
|
351 |
if (p_name != NULL) { |
352 |
char *end_name;
|
353 |
|
354 |
p_name += sizeof("parentFileNameHint") + 1; |
355 |
end_name = strchr(p_name, '\"');
|
356 |
if (end_name == NULL) { |
357 |
return -EINVAL;
|
358 |
} |
359 |
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { |
360 |
return -EINVAL;
|
361 |
} |
362 |
|
363 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
364 |
} |
365 |
|
366 |
return 0; |
367 |
} |
368 |
|
369 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
370 |
* address. return NULL if allocation failed. */
|
371 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
372 |
BlockDriverState *file, bool flat, int64_t sectors,
|
373 |
int64_t l1_offset, int64_t l1_backup_offset, |
374 |
uint32_t l1_size, |
375 |
int l2_size, unsigned int cluster_sectors) |
376 |
{ |
377 |
VmdkExtent *extent; |
378 |
BDRVVmdkState *s = bs->opaque; |
379 |
|
380 |
s->extents = g_realloc(s->extents, |
381 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
382 |
extent = &s->extents[s->num_extents]; |
383 |
s->num_extents++; |
384 |
|
385 |
memset(extent, 0, sizeof(VmdkExtent)); |
386 |
extent->file = file; |
387 |
extent->flat = flat; |
388 |
extent->sectors = sectors; |
389 |
extent->l1_table_offset = l1_offset; |
390 |
extent->l1_backup_table_offset = l1_backup_offset; |
391 |
extent->l1_size = l1_size; |
392 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
393 |
extent->l2_size = l2_size; |
394 |
extent->cluster_sectors = cluster_sectors; |
395 |
|
396 |
if (s->num_extents > 1) { |
397 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
398 |
} else {
|
399 |
extent->end_sector = extent->sectors; |
400 |
} |
401 |
bs->total_sectors = extent->end_sector; |
402 |
return extent;
|
403 |
} |
404 |
|
405 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
406 |
{ |
407 |
int ret;
|
408 |
int l1_size, i;
|
409 |
|
410 |
/* read the L1 table */
|
411 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
412 |
extent->l1_table = g_malloc(l1_size); |
413 |
ret = bdrv_pread(extent->file, |
414 |
extent->l1_table_offset, |
415 |
extent->l1_table, |
416 |
l1_size); |
417 |
if (ret < 0) { |
418 |
goto fail_l1;
|
419 |
} |
420 |
for (i = 0; i < extent->l1_size; i++) { |
421 |
le32_to_cpus(&extent->l1_table[i]); |
422 |
} |
423 |
|
424 |
if (extent->l1_backup_table_offset) {
|
425 |
extent->l1_backup_table = g_malloc(l1_size); |
426 |
ret = bdrv_pread(extent->file, |
427 |
extent->l1_backup_table_offset, |
428 |
extent->l1_backup_table, |
429 |
l1_size); |
430 |
if (ret < 0) { |
431 |
goto fail_l1b;
|
432 |
} |
433 |
for (i = 0; i < extent->l1_size; i++) { |
434 |
le32_to_cpus(&extent->l1_backup_table[i]); |
435 |
} |
436 |
} |
437 |
|
438 |
extent->l2_cache = |
439 |
g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
440 |
return 0; |
441 |
fail_l1b:
|
442 |
g_free(extent->l1_backup_table); |
443 |
fail_l1:
|
444 |
g_free(extent->l1_table); |
445 |
return ret;
|
446 |
} |
447 |
|
448 |
static int vmdk_open_vmdk3(BlockDriverState *bs, |
449 |
BlockDriverState *file, |
450 |
int flags)
|
451 |
{ |
452 |
int ret;
|
453 |
uint32_t magic; |
454 |
VMDK3Header header; |
455 |
VmdkExtent *extent; |
456 |
|
457 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
458 |
if (ret < 0) { |
459 |
return ret;
|
460 |
} |
461 |
extent = vmdk_add_extent(bs, |
462 |
bs->file, false,
|
463 |
le32_to_cpu(header.disk_sectors), |
464 |
le32_to_cpu(header.l1dir_offset) << 9,
|
465 |
0, 1 << 6, 1 << 9, |
466 |
le32_to_cpu(header.granularity)); |
467 |
ret = vmdk_init_tables(bs, extent); |
468 |
if (ret) {
|
469 |
/* free extent allocated by vmdk_add_extent */
|
470 |
vmdk_free_last_extent(bs); |
471 |
} |
472 |
return ret;
|
473 |
} |
474 |
|
475 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
476 |
int64_t desc_offset); |
477 |
|
478 |
static int vmdk_open_vmdk4(BlockDriverState *bs, |
479 |
BlockDriverState *file, |
480 |
int flags)
|
481 |
{ |
482 |
int ret;
|
483 |
uint32_t magic; |
484 |
uint32_t l1_size, l1_entry_sectors; |
485 |
VMDK4Header header; |
486 |
VmdkExtent *extent; |
487 |
int64_t l1_backup_offset = 0;
|
488 |
|
489 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
490 |
if (ret < 0) { |
491 |
return ret;
|
492 |
} |
493 |
if (header.capacity == 0 && header.desc_offset) { |
494 |
return vmdk_open_desc_file(bs, flags, header.desc_offset << 9); |
495 |
} |
496 |
|
497 |
if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
|
498 |
/*
|
499 |
* The footer takes precedence over the header, so read it in. The
|
500 |
* footer starts at offset -1024 from the end: One sector for the
|
501 |
* footer, and another one for the end-of-stream marker.
|
502 |
*/
|
503 |
struct {
|
504 |
struct {
|
505 |
uint64_t val; |
506 |
uint32_t size; |
507 |
uint32_t type; |
508 |
uint8_t pad[512 - 16]; |
509 |
} QEMU_PACKED footer_marker; |
510 |
|
511 |
uint32_t magic; |
512 |
VMDK4Header header; |
513 |
uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; |
514 |
|
515 |
struct {
|
516 |
uint64_t val; |
517 |
uint32_t size; |
518 |
uint32_t type; |
519 |
uint8_t pad[512 - 16]; |
520 |
} QEMU_PACKED eos_marker; |
521 |
} QEMU_PACKED footer; |
522 |
|
523 |
ret = bdrv_pread(file, |
524 |
bs->file->total_sectors * 512 - 1536, |
525 |
&footer, sizeof(footer));
|
526 |
if (ret < 0) { |
527 |
return ret;
|
528 |
} |
529 |
|
530 |
/* Some sanity checks for the footer */
|
531 |
if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
|
532 |
le32_to_cpu(footer.footer_marker.size) != 0 ||
|
533 |
le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || |
534 |
le64_to_cpu(footer.eos_marker.val) != 0 ||
|
535 |
le32_to_cpu(footer.eos_marker.size) != 0 ||
|
536 |
le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) |
537 |
{ |
538 |
return -EINVAL;
|
539 |
} |
540 |
|
541 |
header = footer.header; |
542 |
} |
543 |
|
544 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
545 |
* le64_to_cpu(header.granularity); |
546 |
if (l1_entry_sectors == 0) { |
547 |
return -EINVAL;
|
548 |
} |
549 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
550 |
/ l1_entry_sectors; |
551 |
if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
|
552 |
l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
|
553 |
} |
554 |
extent = vmdk_add_extent(bs, file, false,
|
555 |
le64_to_cpu(header.capacity), |
556 |
le64_to_cpu(header.gd_offset) << 9,
|
557 |
l1_backup_offset, |
558 |
l1_size, |
559 |
le32_to_cpu(header.num_gtes_per_gte), |
560 |
le64_to_cpu(header.granularity)); |
561 |
extent->compressed = |
562 |
le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; |
563 |
extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; |
564 |
ret = vmdk_init_tables(bs, extent); |
565 |
if (ret) {
|
566 |
/* free extent allocated by vmdk_add_extent */
|
567 |
vmdk_free_last_extent(bs); |
568 |
} |
569 |
return ret;
|
570 |
} |
571 |
|
572 |
/* find an option value out of descriptor file */
|
573 |
static int vmdk_parse_description(const char *desc, const char *opt_name, |
574 |
char *buf, int buf_size) |
575 |
{ |
576 |
char *opt_pos, *opt_end;
|
577 |
const char *end = desc + strlen(desc); |
578 |
|
579 |
opt_pos = strstr(desc, opt_name); |
580 |
if (!opt_pos) {
|
581 |
return -1; |
582 |
} |
583 |
/* Skip "=\"" following opt_name */
|
584 |
opt_pos += strlen(opt_name) + 2;
|
585 |
if (opt_pos >= end) {
|
586 |
return -1; |
587 |
} |
588 |
opt_end = opt_pos; |
589 |
while (opt_end < end && *opt_end != '"') { |
590 |
opt_end++; |
591 |
} |
592 |
if (opt_end == end || buf_size < opt_end - opt_pos + 1) { |
593 |
return -1; |
594 |
} |
595 |
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
596 |
return 0; |
597 |
} |
598 |
|
599 |
/* Open an extent file and append to bs array */
|
600 |
static int vmdk_open_sparse(BlockDriverState *bs, |
601 |
BlockDriverState *file, |
602 |
int flags)
|
603 |
{ |
604 |
uint32_t magic; |
605 |
|
606 |
if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
607 |
return -EIO;
|
608 |
} |
609 |
|
610 |
magic = be32_to_cpu(magic); |
611 |
switch (magic) {
|
612 |
case VMDK3_MAGIC:
|
613 |
return vmdk_open_vmdk3(bs, file, flags);
|
614 |
break;
|
615 |
case VMDK4_MAGIC:
|
616 |
return vmdk_open_vmdk4(bs, file, flags);
|
617 |
break;
|
618 |
default:
|
619 |
return -EINVAL;
|
620 |
break;
|
621 |
} |
622 |
} |
623 |
|
624 |
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, |
625 |
const char *desc_file_path) |
626 |
{ |
627 |
int ret;
|
628 |
char access[11]; |
629 |
char type[11]; |
630 |
char fname[512]; |
631 |
const char *p = desc; |
632 |
int64_t sectors = 0;
|
633 |
int64_t flat_offset; |
634 |
char extent_path[PATH_MAX];
|
635 |
BlockDriverState *extent_file; |
636 |
|
637 |
while (*p) {
|
638 |
/* parse extent line:
|
639 |
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
640 |
* or
|
641 |
* RW [size in sectors] SPARSE "file-name.vmdk"
|
642 |
*/
|
643 |
flat_offset = -1;
|
644 |
ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, |
645 |
access, §ors, type, fname, &flat_offset); |
646 |
if (ret < 4 || strcmp(access, "RW")) { |
647 |
goto next_line;
|
648 |
} else if (!strcmp(type, "FLAT")) { |
649 |
if (ret != 5 || flat_offset < 0) { |
650 |
return -EINVAL;
|
651 |
} |
652 |
} else if (ret != 4) { |
653 |
return -EINVAL;
|
654 |
} |
655 |
|
656 |
/* trim the quotation marks around */
|
657 |
if (fname[0] == '"') { |
658 |
memmove(fname, fname + 1, strlen(fname));
|
659 |
if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { |
660 |
return -EINVAL;
|
661 |
} |
662 |
fname[strlen(fname) - 1] = '\0'; |
663 |
} |
664 |
if (sectors <= 0 || |
665 |
(strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || |
666 |
(strcmp(access, "RW"))) {
|
667 |
goto next_line;
|
668 |
} |
669 |
|
670 |
path_combine(extent_path, sizeof(extent_path),
|
671 |
desc_file_path, fname); |
672 |
ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); |
673 |
if (ret) {
|
674 |
return ret;
|
675 |
} |
676 |
|
677 |
/* save to extents array */
|
678 |
if (!strcmp(type, "FLAT")) { |
679 |
/* FLAT extent */
|
680 |
VmdkExtent *extent; |
681 |
|
682 |
extent = vmdk_add_extent(bs, extent_file, true, sectors,
|
683 |
0, 0, 0, 0, sectors); |
684 |
extent->flat_start_offset = flat_offset << 9;
|
685 |
} else if (!strcmp(type, "SPARSE")) { |
686 |
/* SPARSE extent */
|
687 |
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags); |
688 |
if (ret) {
|
689 |
bdrv_delete(extent_file); |
690 |
return ret;
|
691 |
} |
692 |
} else {
|
693 |
fprintf(stderr, |
694 |
"VMDK: Not supported extent type \"%s\""".\n", type); |
695 |
return -ENOTSUP;
|
696 |
} |
697 |
next_line:
|
698 |
/* move to next line */
|
699 |
while (*p && *p != '\n') { |
700 |
p++; |
701 |
} |
702 |
p++; |
703 |
} |
704 |
return 0; |
705 |
} |
706 |
|
707 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
708 |
int64_t desc_offset) |
709 |
{ |
710 |
int ret;
|
711 |
char buf[2048]; |
712 |
char ct[128]; |
713 |
BDRVVmdkState *s = bs->opaque; |
714 |
|
715 |
ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf));
|
716 |
if (ret < 0) { |
717 |
return ret;
|
718 |
} |
719 |
buf[2047] = '\0'; |
720 |
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { |
721 |
return -EINVAL;
|
722 |
} |
723 |
if (strcmp(ct, "monolithicFlat") && |
724 |
strcmp(ct, "twoGbMaxExtentSparse") &&
|
725 |
strcmp(ct, "twoGbMaxExtentFlat")) {
|
726 |
fprintf(stderr, |
727 |
"VMDK: Not supported image type \"%s\""".\n", ct); |
728 |
return -ENOTSUP;
|
729 |
} |
730 |
s->desc_offset = 0;
|
731 |
return vmdk_parse_extents(buf, bs, bs->file->filename);
|
732 |
} |
733 |
|
734 |
static int vmdk_open(BlockDriverState *bs, int flags) |
735 |
{ |
736 |
int ret;
|
737 |
BDRVVmdkState *s = bs->opaque; |
738 |
|
739 |
if (vmdk_open_sparse(bs, bs->file, flags) == 0) { |
740 |
s->desc_offset = 0x200;
|
741 |
} else {
|
742 |
ret = vmdk_open_desc_file(bs, flags, 0);
|
743 |
if (ret) {
|
744 |
goto fail;
|
745 |
} |
746 |
} |
747 |
/* try to open parent images, if exist */
|
748 |
ret = vmdk_parent_open(bs); |
749 |
if (ret) {
|
750 |
goto fail;
|
751 |
} |
752 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
753 |
qemu_co_mutex_init(&s->lock); |
754 |
|
755 |
/* Disable migration when VMDK images are used */
|
756 |
error_set(&s->migration_blocker, |
757 |
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
758 |
"vmdk", bs->device_name, "live migration"); |
759 |
migrate_add_blocker(s->migration_blocker); |
760 |
|
761 |
return 0; |
762 |
|
763 |
fail:
|
764 |
vmdk_free_extents(bs); |
765 |
return ret;
|
766 |
} |
767 |
|
768 |
static int get_whole_cluster(BlockDriverState *bs, |
769 |
VmdkExtent *extent, |
770 |
uint64_t cluster_offset, |
771 |
uint64_t offset, |
772 |
bool allocate)
|
773 |
{ |
774 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
775 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
776 |
|
777 |
/* we will be here if it's first write on non-exist grain(cluster).
|
778 |
* try to read from parent image, if exist */
|
779 |
if (bs->backing_hd) {
|
780 |
int ret;
|
781 |
|
782 |
if (!vmdk_is_cid_valid(bs)) {
|
783 |
return -1; |
784 |
} |
785 |
|
786 |
/* floor offset to cluster */
|
787 |
offset -= offset % (extent->cluster_sectors * 512);
|
788 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
789 |
extent->cluster_sectors); |
790 |
if (ret < 0) { |
791 |
return -1; |
792 |
} |
793 |
|
794 |
/* Write grain only into the active image */
|
795 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
796 |
extent->cluster_sectors); |
797 |
if (ret < 0) { |
798 |
return -1; |
799 |
} |
800 |
} |
801 |
return 0; |
802 |
} |
803 |
|
804 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
805 |
{ |
806 |
/* update L2 table */
|
807 |
if (bdrv_pwrite_sync(
|
808 |
extent->file, |
809 |
((int64_t)m_data->l2_offset * 512)
|
810 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
811 |
&(m_data->offset), |
812 |
sizeof(m_data->offset)
|
813 |
) < 0) {
|
814 |
return -1; |
815 |
} |
816 |
/* update backup L2 table */
|
817 |
if (extent->l1_backup_table_offset != 0) { |
818 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
819 |
if (bdrv_pwrite_sync(
|
820 |
extent->file, |
821 |
((int64_t)m_data->l2_offset * 512)
|
822 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
823 |
&(m_data->offset), sizeof(m_data->offset)
|
824 |
) < 0) {
|
825 |
return -1; |
826 |
} |
827 |
} |
828 |
|
829 |
return 0; |
830 |
} |
831 |
|
832 |
static int get_cluster_offset(BlockDriverState *bs, |
833 |
VmdkExtent *extent, |
834 |
VmdkMetaData *m_data, |
835 |
uint64_t offset, |
836 |
int allocate,
|
837 |
uint64_t *cluster_offset) |
838 |
{ |
839 |
unsigned int l1_index, l2_offset, l2_index; |
840 |
int min_index, i, j;
|
841 |
uint32_t min_count, *l2_table, tmp = 0;
|
842 |
|
843 |
if (m_data) {
|
844 |
m_data->valid = 0;
|
845 |
} |
846 |
if (extent->flat) {
|
847 |
*cluster_offset = extent->flat_start_offset; |
848 |
return 0; |
849 |
} |
850 |
|
851 |
offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; |
852 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
853 |
if (l1_index >= extent->l1_size) {
|
854 |
return -1; |
855 |
} |
856 |
l2_offset = extent->l1_table[l1_index]; |
857 |
if (!l2_offset) {
|
858 |
return -1; |
859 |
} |
860 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
861 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
862 |
/* increment the hit count */
|
863 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
864 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
865 |
extent->l2_cache_counts[j] >>= 1;
|
866 |
} |
867 |
} |
868 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
869 |
goto found;
|
870 |
} |
871 |
} |
872 |
/* not found: load a new entry in the least used one */
|
873 |
min_index = 0;
|
874 |
min_count = 0xffffffff;
|
875 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
876 |
if (extent->l2_cache_counts[i] < min_count) {
|
877 |
min_count = extent->l2_cache_counts[i]; |
878 |
min_index = i; |
879 |
} |
880 |
} |
881 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
882 |
if (bdrv_pread(
|
883 |
extent->file, |
884 |
(int64_t)l2_offset * 512,
|
885 |
l2_table, |
886 |
extent->l2_size * sizeof(uint32_t)
|
887 |
) != extent->l2_size * sizeof(uint32_t)) {
|
888 |
return -1; |
889 |
} |
890 |
|
891 |
extent->l2_cache_offsets[min_index] = l2_offset; |
892 |
extent->l2_cache_counts[min_index] = 1;
|
893 |
found:
|
894 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
895 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
896 |
|
897 |
if (!*cluster_offset) {
|
898 |
if (!allocate) {
|
899 |
return -1; |
900 |
} |
901 |
|
902 |
/* Avoid the L2 tables update for the images that have snapshots. */
|
903 |
*cluster_offset = bdrv_getlength(extent->file); |
904 |
if (!extent->compressed) {
|
905 |
bdrv_truncate( |
906 |
extent->file, |
907 |
*cluster_offset + (extent->cluster_sectors << 9)
|
908 |
); |
909 |
} |
910 |
|
911 |
*cluster_offset >>= 9;
|
912 |
tmp = cpu_to_le32(*cluster_offset); |
913 |
l2_table[l2_index] = tmp; |
914 |
|
915 |
/* First of all we write grain itself, to avoid race condition
|
916 |
* that may to corrupt the image.
|
917 |
* This problem may occur because of insufficient space on host disk
|
918 |
* or inappropriate VM shutdown.
|
919 |
*/
|
920 |
if (get_whole_cluster(
|
921 |
bs, extent, *cluster_offset, offset, allocate) == -1) {
|
922 |
return -1; |
923 |
} |
924 |
|
925 |
if (m_data) {
|
926 |
m_data->offset = tmp; |
927 |
m_data->l1_index = l1_index; |
928 |
m_data->l2_index = l2_index; |
929 |
m_data->l2_offset = l2_offset; |
930 |
m_data->valid = 1;
|
931 |
} |
932 |
} |
933 |
*cluster_offset <<= 9;
|
934 |
return 0; |
935 |
} |
936 |
|
937 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
938 |
int64_t sector_num, VmdkExtent *start_hint) |
939 |
{ |
940 |
VmdkExtent *extent = start_hint; |
941 |
|
942 |
if (!extent) {
|
943 |
extent = &s->extents[0];
|
944 |
} |
945 |
while (extent < &s->extents[s->num_extents]) {
|
946 |
if (sector_num < extent->end_sector) {
|
947 |
return extent;
|
948 |
} |
949 |
extent++; |
950 |
} |
951 |
return NULL; |
952 |
} |
953 |
|
954 |
static int coroutine_fn vmdk_co_is_allocated(BlockDriverState *bs, |
955 |
int64_t sector_num, int nb_sectors, int *pnum) |
956 |
{ |
957 |
BDRVVmdkState *s = bs->opaque; |
958 |
int64_t index_in_cluster, n, ret; |
959 |
uint64_t offset; |
960 |
VmdkExtent *extent; |
961 |
|
962 |
extent = find_extent(s, sector_num, NULL);
|
963 |
if (!extent) {
|
964 |
return 0; |
965 |
} |
966 |
qemu_co_mutex_lock(&s->lock); |
967 |
ret = get_cluster_offset(bs, extent, NULL,
|
968 |
sector_num * 512, 0, &offset); |
969 |
qemu_co_mutex_unlock(&s->lock); |
970 |
/* get_cluster_offset returning 0 means success */
|
971 |
ret = !ret; |
972 |
|
973 |
index_in_cluster = sector_num % extent->cluster_sectors; |
974 |
n = extent->cluster_sectors - index_in_cluster; |
975 |
if (n > nb_sectors) {
|
976 |
n = nb_sectors; |
977 |
} |
978 |
*pnum = n; |
979 |
return ret;
|
980 |
} |
981 |
|
982 |
static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, |
983 |
int64_t offset_in_cluster, const uint8_t *buf,
|
984 |
int nb_sectors, int64_t sector_num)
|
985 |
{ |
986 |
int ret;
|
987 |
VmdkGrainMarker *data = NULL;
|
988 |
uLongf buf_len; |
989 |
const uint8_t *write_buf = buf;
|
990 |
int write_len = nb_sectors * 512; |
991 |
|
992 |
if (extent->compressed) {
|
993 |
if (!extent->has_marker) {
|
994 |
ret = -EINVAL; |
995 |
goto out;
|
996 |
} |
997 |
buf_len = (extent->cluster_sectors << 9) * 2; |
998 |
data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
|
999 |
if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || |
1000 |
buf_len == 0) {
|
1001 |
ret = -EINVAL; |
1002 |
goto out;
|
1003 |
} |
1004 |
data->lba = sector_num; |
1005 |
data->size = buf_len; |
1006 |
write_buf = (uint8_t *)data; |
1007 |
write_len = buf_len + sizeof(VmdkGrainMarker);
|
1008 |
} |
1009 |
ret = bdrv_pwrite(extent->file, |
1010 |
cluster_offset + offset_in_cluster, |
1011 |
write_buf, |
1012 |
write_len); |
1013 |
if (ret != write_len) {
|
1014 |
ret = ret < 0 ? ret : -EIO;
|
1015 |
goto out;
|
1016 |
} |
1017 |
ret = 0;
|
1018 |
out:
|
1019 |
g_free(data); |
1020 |
return ret;
|
1021 |
} |
1022 |
|
1023 |
static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, |
1024 |
int64_t offset_in_cluster, uint8_t *buf, |
1025 |
int nb_sectors)
|
1026 |
{ |
1027 |
int ret;
|
1028 |
int cluster_bytes, buf_bytes;
|
1029 |
uint8_t *cluster_buf, *compressed_data; |
1030 |
uint8_t *uncomp_buf; |
1031 |
uint32_t data_len; |
1032 |
VmdkGrainMarker *marker; |
1033 |
uLongf buf_len; |
1034 |
|
1035 |
|
1036 |
if (!extent->compressed) {
|
1037 |
ret = bdrv_pread(extent->file, |
1038 |
cluster_offset + offset_in_cluster, |
1039 |
buf, nb_sectors * 512);
|
1040 |
if (ret == nb_sectors * 512) { |
1041 |
return 0; |
1042 |
} else {
|
1043 |
return -EIO;
|
1044 |
} |
1045 |
} |
1046 |
cluster_bytes = extent->cluster_sectors * 512;
|
1047 |
/* Read two clusters in case GrainMarker + compressed data > one cluster */
|
1048 |
buf_bytes = cluster_bytes * 2;
|
1049 |
cluster_buf = g_malloc(buf_bytes); |
1050 |
uncomp_buf = g_malloc(cluster_bytes); |
1051 |
ret = bdrv_pread(extent->file, |
1052 |
cluster_offset, |
1053 |
cluster_buf, buf_bytes); |
1054 |
if (ret < 0) { |
1055 |
goto out;
|
1056 |
} |
1057 |
compressed_data = cluster_buf; |
1058 |
buf_len = cluster_bytes; |
1059 |
data_len = cluster_bytes; |
1060 |
if (extent->has_marker) {
|
1061 |
marker = (VmdkGrainMarker *)cluster_buf; |
1062 |
compressed_data = marker->data; |
1063 |
data_len = le32_to_cpu(marker->size); |
1064 |
} |
1065 |
if (!data_len || data_len > buf_bytes) {
|
1066 |
ret = -EINVAL; |
1067 |
goto out;
|
1068 |
} |
1069 |
ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); |
1070 |
if (ret != Z_OK) {
|
1071 |
ret = -EINVAL; |
1072 |
goto out;
|
1073 |
|
1074 |
} |
1075 |
if (offset_in_cluster < 0 || |
1076 |
offset_in_cluster + nb_sectors * 512 > buf_len) {
|
1077 |
ret = -EINVAL; |
1078 |
goto out;
|
1079 |
} |
1080 |
memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512);
|
1081 |
ret = 0;
|
1082 |
|
1083 |
out:
|
1084 |
g_free(uncomp_buf); |
1085 |
g_free(cluster_buf); |
1086 |
return ret;
|
1087 |
} |
1088 |
|
1089 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
1090 |
uint8_t *buf, int nb_sectors)
|
1091 |
{ |
1092 |
BDRVVmdkState *s = bs->opaque; |
1093 |
int ret;
|
1094 |
uint64_t n, index_in_cluster; |
1095 |
uint64_t extent_begin_sector, extent_relative_sector_num; |
1096 |
VmdkExtent *extent = NULL;
|
1097 |
uint64_t cluster_offset; |
1098 |
|
1099 |
while (nb_sectors > 0) { |
1100 |
extent = find_extent(s, sector_num, extent); |
1101 |
if (!extent) {
|
1102 |
return -EIO;
|
1103 |
} |
1104 |
ret = get_cluster_offset( |
1105 |
bs, extent, NULL,
|
1106 |
sector_num << 9, 0, &cluster_offset); |
1107 |
extent_begin_sector = extent->end_sector - extent->sectors; |
1108 |
extent_relative_sector_num = sector_num - extent_begin_sector; |
1109 |
index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; |
1110 |
n = extent->cluster_sectors - index_in_cluster; |
1111 |
if (n > nb_sectors) {
|
1112 |
n = nb_sectors; |
1113 |
} |
1114 |
if (ret) {
|
1115 |
/* if not allocated, try to read from parent image, if exist */
|
1116 |
if (bs->backing_hd) {
|
1117 |
if (!vmdk_is_cid_valid(bs)) {
|
1118 |
return -EINVAL;
|
1119 |
} |
1120 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
1121 |
if (ret < 0) { |
1122 |
return ret;
|
1123 |
} |
1124 |
} else {
|
1125 |
memset(buf, 0, 512 * n); |
1126 |
} |
1127 |
} else {
|
1128 |
ret = vmdk_read_extent(extent, |
1129 |
cluster_offset, index_in_cluster * 512,
|
1130 |
buf, n); |
1131 |
if (ret) {
|
1132 |
return ret;
|
1133 |
} |
1134 |
} |
1135 |
nb_sectors -= n; |
1136 |
sector_num += n; |
1137 |
buf += n * 512;
|
1138 |
} |
1139 |
return 0; |
1140 |
} |
1141 |
|
1142 |
static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, |
1143 |
uint8_t *buf, int nb_sectors)
|
1144 |
{ |
1145 |
int ret;
|
1146 |
BDRVVmdkState *s = bs->opaque; |
1147 |
qemu_co_mutex_lock(&s->lock); |
1148 |
ret = vmdk_read(bs, sector_num, buf, nb_sectors); |
1149 |
qemu_co_mutex_unlock(&s->lock); |
1150 |
return ret;
|
1151 |
} |
1152 |
|
1153 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
1154 |
const uint8_t *buf, int nb_sectors) |
1155 |
{ |
1156 |
BDRVVmdkState *s = bs->opaque; |
1157 |
VmdkExtent *extent = NULL;
|
1158 |
int n, ret;
|
1159 |
int64_t index_in_cluster; |
1160 |
uint64_t extent_begin_sector, extent_relative_sector_num; |
1161 |
uint64_t cluster_offset; |
1162 |
VmdkMetaData m_data; |
1163 |
|
1164 |
if (sector_num > bs->total_sectors) {
|
1165 |
fprintf(stderr, |
1166 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
1167 |
" total_sectors=0x%" PRIx64 "\n", |
1168 |
sector_num, bs->total_sectors); |
1169 |
return -EIO;
|
1170 |
} |
1171 |
|
1172 |
while (nb_sectors > 0) { |
1173 |
extent = find_extent(s, sector_num, extent); |
1174 |
if (!extent) {
|
1175 |
return -EIO;
|
1176 |
} |
1177 |
ret = get_cluster_offset( |
1178 |
bs, |
1179 |
extent, |
1180 |
&m_data, |
1181 |
sector_num << 9, !extent->compressed,
|
1182 |
&cluster_offset); |
1183 |
if (extent->compressed) {
|
1184 |
if (ret == 0) { |
1185 |
/* Refuse write to allocated cluster for streamOptimized */
|
1186 |
fprintf(stderr, |
1187 |
"VMDK: can't write to allocated cluster"
|
1188 |
" for streamOptimized\n");
|
1189 |
return -EIO;
|
1190 |
} else {
|
1191 |
/* allocate */
|
1192 |
ret = get_cluster_offset( |
1193 |
bs, |
1194 |
extent, |
1195 |
&m_data, |
1196 |
sector_num << 9, 1, |
1197 |
&cluster_offset); |
1198 |
} |
1199 |
} |
1200 |
if (ret) {
|
1201 |
return -EINVAL;
|
1202 |
} |
1203 |
extent_begin_sector = extent->end_sector - extent->sectors; |
1204 |
extent_relative_sector_num = sector_num - extent_begin_sector; |
1205 |
index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; |
1206 |
n = extent->cluster_sectors - index_in_cluster; |
1207 |
if (n > nb_sectors) {
|
1208 |
n = nb_sectors; |
1209 |
} |
1210 |
|
1211 |
ret = vmdk_write_extent(extent, |
1212 |
cluster_offset, index_in_cluster * 512,
|
1213 |
buf, n, sector_num); |
1214 |
if (ret) {
|
1215 |
return ret;
|
1216 |
} |
1217 |
if (m_data.valid) {
|
1218 |
/* update L2 tables */
|
1219 |
if (vmdk_L2update(extent, &m_data) == -1) { |
1220 |
return -EIO;
|
1221 |
} |
1222 |
} |
1223 |
nb_sectors -= n; |
1224 |
sector_num += n; |
1225 |
buf += n * 512;
|
1226 |
|
1227 |
/* update CID on the first write every time the virtual disk is
|
1228 |
* opened */
|
1229 |
if (!s->cid_updated) {
|
1230 |
ret = vmdk_write_cid(bs, time(NULL));
|
1231 |
if (ret < 0) { |
1232 |
return ret;
|
1233 |
} |
1234 |
s->cid_updated = true;
|
1235 |
} |
1236 |
} |
1237 |
return 0; |
1238 |
} |
1239 |
|
1240 |
static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, |
1241 |
const uint8_t *buf, int nb_sectors) |
1242 |
{ |
1243 |
int ret;
|
1244 |
BDRVVmdkState *s = bs->opaque; |
1245 |
qemu_co_mutex_lock(&s->lock); |
1246 |
ret = vmdk_write(bs, sector_num, buf, nb_sectors); |
1247 |
qemu_co_mutex_unlock(&s->lock); |
1248 |
return ret;
|
1249 |
} |
1250 |
|
1251 |
|
1252 |
static int vmdk_create_extent(const char *filename, int64_t filesize, |
1253 |
bool flat, bool compress) |
1254 |
{ |
1255 |
int ret, i;
|
1256 |
int fd = 0; |
1257 |
VMDK4Header header; |
1258 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
1259 |
|
1260 |
fd = qemu_open(filename, |
1261 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1262 |
0644);
|
1263 |
if (fd < 0) { |
1264 |
return -errno;
|
1265 |
} |
1266 |
if (flat) {
|
1267 |
ret = ftruncate(fd, filesize); |
1268 |
if (ret < 0) { |
1269 |
ret = -errno; |
1270 |
} |
1271 |
goto exit;
|
1272 |
} |
1273 |
magic = cpu_to_be32(VMDK4_MAGIC); |
1274 |
memset(&header, 0, sizeof(header)); |
1275 |
header.version = 1;
|
1276 |
header.flags = |
1277 |
3 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0); |
1278 |
header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
|
1279 |
header.capacity = filesize / 512;
|
1280 |
header.granularity = 128;
|
1281 |
header.num_gtes_per_gte = 512;
|
1282 |
|
1283 |
grains = (filesize / 512 + header.granularity - 1) / header.granularity; |
1284 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
1285 |
gt_count = |
1286 |
(grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
1287 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
1288 |
|
1289 |
header.desc_offset = 1;
|
1290 |
header.desc_size = 20;
|
1291 |
header.rgd_offset = header.desc_offset + header.desc_size; |
1292 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
1293 |
header.grain_offset = |
1294 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
1295 |
header.granularity - 1) / header.granularity) *
|
1296 |
header.granularity; |
1297 |
/* swap endianness for all header fields */
|
1298 |
header.version = cpu_to_le32(header.version); |
1299 |
header.flags = cpu_to_le32(header.flags); |
1300 |
header.capacity = cpu_to_le64(header.capacity); |
1301 |
header.granularity = cpu_to_le64(header.granularity); |
1302 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
1303 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
1304 |
header.desc_size = cpu_to_le64(header.desc_size); |
1305 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
1306 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
1307 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
1308 |
header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); |
1309 |
|
1310 |
header.check_bytes[0] = 0xa; |
1311 |
header.check_bytes[1] = 0x20; |
1312 |
header.check_bytes[2] = 0xd; |
1313 |
header.check_bytes[3] = 0xa; |
1314 |
|
1315 |
/* write all the data */
|
1316 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
1317 |
if (ret != sizeof(magic)) { |
1318 |
ret = -errno; |
1319 |
goto exit;
|
1320 |
} |
1321 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
1322 |
if (ret != sizeof(header)) { |
1323 |
ret = -errno; |
1324 |
goto exit;
|
1325 |
} |
1326 |
|
1327 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
1328 |
if (ret < 0) { |
1329 |
ret = -errno; |
1330 |
goto exit;
|
1331 |
} |
1332 |
|
1333 |
/* write grain directory */
|
1334 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
1335 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
1336 |
i < gt_count; i++, tmp += gt_size) { |
1337 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1338 |
if (ret != sizeof(tmp)) { |
1339 |
ret = -errno; |
1340 |
goto exit;
|
1341 |
} |
1342 |
} |
1343 |
|
1344 |
/* write backup grain directory */
|
1345 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1346 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1347 |
i < gt_count; i++, tmp += gt_size) { |
1348 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1349 |
if (ret != sizeof(tmp)) { |
1350 |
ret = -errno; |
1351 |
goto exit;
|
1352 |
} |
1353 |
} |
1354 |
|
1355 |
ret = 0;
|
1356 |
exit:
|
1357 |
qemu_close(fd); |
1358 |
return ret;
|
1359 |
} |
1360 |
|
1361 |
static int filename_decompose(const char *filename, char *path, char *prefix, |
1362 |
char *postfix, size_t buf_len)
|
1363 |
{ |
1364 |
const char *p, *q; |
1365 |
|
1366 |
if (filename == NULL || !strlen(filename)) { |
1367 |
fprintf(stderr, "Vmdk: no filename provided.\n");
|
1368 |
return -1; |
1369 |
} |
1370 |
p = strrchr(filename, '/');
|
1371 |
if (p == NULL) { |
1372 |
p = strrchr(filename, '\\');
|
1373 |
} |
1374 |
if (p == NULL) { |
1375 |
p = strrchr(filename, ':');
|
1376 |
} |
1377 |
if (p != NULL) { |
1378 |
p++; |
1379 |
if (p - filename >= buf_len) {
|
1380 |
return -1; |
1381 |
} |
1382 |
pstrcpy(path, p - filename + 1, filename);
|
1383 |
} else {
|
1384 |
p = filename; |
1385 |
path[0] = '\0'; |
1386 |
} |
1387 |
q = strrchr(p, '.');
|
1388 |
if (q == NULL) { |
1389 |
pstrcpy(prefix, buf_len, p); |
1390 |
postfix[0] = '\0'; |
1391 |
} else {
|
1392 |
if (q - p >= buf_len) {
|
1393 |
return -1; |
1394 |
} |
1395 |
pstrcpy(prefix, q - p + 1, p);
|
1396 |
pstrcpy(postfix, buf_len, q); |
1397 |
} |
1398 |
return 0; |
1399 |
} |
1400 |
|
1401 |
static int relative_path(char *dest, int dest_size, |
1402 |
const char *base, const char *target) |
1403 |
{ |
1404 |
int i = 0; |
1405 |
int n = 0; |
1406 |
const char *p, *q; |
1407 |
#ifdef _WIN32
|
1408 |
const char *sep = "\\"; |
1409 |
#else
|
1410 |
const char *sep = "/"; |
1411 |
#endif
|
1412 |
|
1413 |
if (!(dest && base && target)) {
|
1414 |
return -1; |
1415 |
} |
1416 |
if (path_is_absolute(target)) {
|
1417 |
pstrcpy(dest, dest_size, target); |
1418 |
return 0; |
1419 |
} |
1420 |
while (base[i] == target[i]) {
|
1421 |
i++; |
1422 |
} |
1423 |
p = &base[i]; |
1424 |
q = &target[i]; |
1425 |
while (*p) {
|
1426 |
if (*p == *sep) {
|
1427 |
n++; |
1428 |
} |
1429 |
p++; |
1430 |
} |
1431 |
dest[0] = '\0'; |
1432 |
for (; n; n--) {
|
1433 |
pstrcat(dest, dest_size, "..");
|
1434 |
pstrcat(dest, dest_size, sep); |
1435 |
} |
1436 |
pstrcat(dest, dest_size, q); |
1437 |
return 0; |
1438 |
} |
1439 |
|
1440 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
1441 |
{ |
1442 |
int fd, idx = 0; |
1443 |
char desc[BUF_SIZE];
|
1444 |
int64_t total_size = 0, filesize;
|
1445 |
const char *backing_file = NULL; |
1446 |
const char *fmt = NULL; |
1447 |
int flags = 0; |
1448 |
int ret = 0; |
1449 |
bool flat, split, compress;
|
1450 |
char ext_desc_lines[BUF_SIZE] = ""; |
1451 |
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
|
1452 |
const int64_t split_size = 0x80000000; /* VMDK has constant split size */ |
1453 |
const char *desc_extent_line; |
1454 |
char parent_desc_line[BUF_SIZE] = ""; |
1455 |
uint32_t parent_cid = 0xffffffff;
|
1456 |
const char desc_template[] = |
1457 |
"# Disk DescriptorFile\n"
|
1458 |
"version=1\n"
|
1459 |
"CID=%x\n"
|
1460 |
"parentCID=%x\n"
|
1461 |
"createType=\"%s\"\n"
|
1462 |
"%s"
|
1463 |
"\n"
|
1464 |
"# Extent description\n"
|
1465 |
"%s"
|
1466 |
"\n"
|
1467 |
"# The Disk Data Base\n"
|
1468 |
"#DDB\n"
|
1469 |
"\n"
|
1470 |
"ddb.virtualHWVersion = \"%d\"\n"
|
1471 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
1472 |
"ddb.geometry.heads = \"16\"\n"
|
1473 |
"ddb.geometry.sectors = \"63\"\n"
|
1474 |
"ddb.adapterType = \"ide\"\n";
|
1475 |
|
1476 |
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
|
1477 |
return -EINVAL;
|
1478 |
} |
1479 |
/* Read out options */
|
1480 |
while (options && options->name) {
|
1481 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1482 |
total_size = options->value.n; |
1483 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1484 |
backing_file = options->value.s; |
1485 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
1486 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
|
1487 |
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { |
1488 |
fmt = options->value.s; |
1489 |
} |
1490 |
options++; |
1491 |
} |
1492 |
if (!fmt) {
|
1493 |
/* Default format to monolithicSparse */
|
1494 |
fmt = "monolithicSparse";
|
1495 |
} else if (strcmp(fmt, "monolithicFlat") && |
1496 |
strcmp(fmt, "monolithicSparse") &&
|
1497 |
strcmp(fmt, "twoGbMaxExtentSparse") &&
|
1498 |
strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1499 |
strcmp(fmt, "streamOptimized")) {
|
1500 |
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
|
1501 |
return -EINVAL;
|
1502 |
} |
1503 |
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1504 |
strcmp(fmt, "twoGbMaxExtentSparse"));
|
1505 |
flat = !(strcmp(fmt, "monolithicFlat") &&
|
1506 |
strcmp(fmt, "twoGbMaxExtentFlat"));
|
1507 |
compress = !strcmp(fmt, "streamOptimized");
|
1508 |
if (flat) {
|
1509 |
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
1510 |
} else {
|
1511 |
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
1512 |
} |
1513 |
if (flat && backing_file) {
|
1514 |
/* not supporting backing file for flat image */
|
1515 |
return -ENOTSUP;
|
1516 |
} |
1517 |
if (backing_file) {
|
1518 |
char parent_filename[PATH_MAX];
|
1519 |
BlockDriverState *bs = bdrv_new("");
|
1520 |
ret = bdrv_open(bs, backing_file, 0, NULL); |
1521 |
if (ret != 0) { |
1522 |
bdrv_delete(bs); |
1523 |
return ret;
|
1524 |
} |
1525 |
if (strcmp(bs->drv->format_name, "vmdk")) { |
1526 |
bdrv_delete(bs); |
1527 |
return -EINVAL;
|
1528 |
} |
1529 |
parent_cid = vmdk_read_cid(bs, 0);
|
1530 |
bdrv_delete(bs); |
1531 |
relative_path(parent_filename, sizeof(parent_filename),
|
1532 |
filename, backing_file); |
1533 |
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
1534 |
"parentFileNameHint=\"%s\"", parent_filename);
|
1535 |
} |
1536 |
|
1537 |
/* Create extents */
|
1538 |
filesize = total_size; |
1539 |
while (filesize > 0) { |
1540 |
char desc_line[BUF_SIZE];
|
1541 |
char ext_filename[PATH_MAX];
|
1542 |
char desc_filename[PATH_MAX];
|
1543 |
int64_t size = filesize; |
1544 |
|
1545 |
if (split && size > split_size) {
|
1546 |
size = split_size; |
1547 |
} |
1548 |
if (split) {
|
1549 |
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", |
1550 |
prefix, flat ? 'f' : 's', ++idx, postfix); |
1551 |
} else if (flat) { |
1552 |
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", |
1553 |
prefix, postfix); |
1554 |
} else {
|
1555 |
snprintf(desc_filename, sizeof(desc_filename), "%s%s", |
1556 |
prefix, postfix); |
1557 |
} |
1558 |
snprintf(ext_filename, sizeof(ext_filename), "%s%s", |
1559 |
path, desc_filename); |
1560 |
|
1561 |
if (vmdk_create_extent(ext_filename, size, flat, compress)) {
|
1562 |
return -EINVAL;
|
1563 |
} |
1564 |
filesize -= size; |
1565 |
|
1566 |
/* Format description line */
|
1567 |
snprintf(desc_line, sizeof(desc_line),
|
1568 |
desc_extent_line, size / 512, desc_filename);
|
1569 |
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
1570 |
} |
1571 |
/* generate descriptor file */
|
1572 |
snprintf(desc, sizeof(desc), desc_template,
|
1573 |
(unsigned int)time(NULL), |
1574 |
parent_cid, |
1575 |
fmt, |
1576 |
parent_desc_line, |
1577 |
ext_desc_lines, |
1578 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1579 |
total_size / (int64_t)(63 * 16 * 512)); |
1580 |
if (split || flat) {
|
1581 |
fd = qemu_open(filename, |
1582 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1583 |
0644);
|
1584 |
} else {
|
1585 |
fd = qemu_open(filename, |
1586 |
O_WRONLY | O_BINARY | O_LARGEFILE, |
1587 |
0644);
|
1588 |
} |
1589 |
if (fd < 0) { |
1590 |
return -errno;
|
1591 |
} |
1592 |
/* the descriptor offset = 0x200 */
|
1593 |
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { |
1594 |
ret = -errno; |
1595 |
goto exit;
|
1596 |
} |
1597 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1598 |
if (ret != strlen(desc)) {
|
1599 |
ret = -errno; |
1600 |
goto exit;
|
1601 |
} |
1602 |
ret = 0;
|
1603 |
exit:
|
1604 |
qemu_close(fd); |
1605 |
return ret;
|
1606 |
} |
1607 |
|
1608 |
static void vmdk_close(BlockDriverState *bs) |
1609 |
{ |
1610 |
BDRVVmdkState *s = bs->opaque; |
1611 |
|
1612 |
vmdk_free_extents(bs); |
1613 |
|
1614 |
migrate_del_blocker(s->migration_blocker); |
1615 |
error_free(s->migration_blocker); |
1616 |
} |
1617 |
|
1618 |
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) |
1619 |
{ |
1620 |
BDRVVmdkState *s = bs->opaque; |
1621 |
int i, err;
|
1622 |
int ret = 0; |
1623 |
|
1624 |
for (i = 0; i < s->num_extents; i++) { |
1625 |
err = bdrv_co_flush(s->extents[i].file); |
1626 |
if (err < 0) { |
1627 |
ret = err; |
1628 |
} |
1629 |
} |
1630 |
return ret;
|
1631 |
} |
1632 |
|
1633 |
static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
|
1634 |
{ |
1635 |
int i;
|
1636 |
int64_t ret = 0;
|
1637 |
int64_t r; |
1638 |
BDRVVmdkState *s = bs->opaque; |
1639 |
|
1640 |
ret = bdrv_get_allocated_file_size(bs->file); |
1641 |
if (ret < 0) { |
1642 |
return ret;
|
1643 |
} |
1644 |
for (i = 0; i < s->num_extents; i++) { |
1645 |
if (s->extents[i].file == bs->file) {
|
1646 |
continue;
|
1647 |
} |
1648 |
r = bdrv_get_allocated_file_size(s->extents[i].file); |
1649 |
if (r < 0) { |
1650 |
return r;
|
1651 |
} |
1652 |
ret += r; |
1653 |
} |
1654 |
return ret;
|
1655 |
} |
1656 |
|
1657 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1658 |
{ |
1659 |
.name = BLOCK_OPT_SIZE, |
1660 |
.type = OPT_SIZE, |
1661 |
.help = "Virtual disk size"
|
1662 |
}, |
1663 |
{ |
1664 |
.name = BLOCK_OPT_BACKING_FILE, |
1665 |
.type = OPT_STRING, |
1666 |
.help = "File name of a base image"
|
1667 |
}, |
1668 |
{ |
1669 |
.name = BLOCK_OPT_COMPAT6, |
1670 |
.type = OPT_FLAG, |
1671 |
.help = "VMDK version 6 image"
|
1672 |
}, |
1673 |
{ |
1674 |
.name = BLOCK_OPT_SUBFMT, |
1675 |
.type = OPT_STRING, |
1676 |
.help = |
1677 |
"VMDK flat extent format, can be one of "
|
1678 |
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
|
1679 |
}, |
1680 |
{ NULL }
|
1681 |
}; |
1682 |
|
1683 |
static BlockDriver bdrv_vmdk = {
|
1684 |
.format_name = "vmdk",
|
1685 |
.instance_size = sizeof(BDRVVmdkState),
|
1686 |
.bdrv_probe = vmdk_probe, |
1687 |
.bdrv_open = vmdk_open, |
1688 |
.bdrv_reopen_prepare = vmdk_reopen_prepare, |
1689 |
.bdrv_read = vmdk_co_read, |
1690 |
.bdrv_write = vmdk_co_write, |
1691 |
.bdrv_close = vmdk_close, |
1692 |
.bdrv_create = vmdk_create, |
1693 |
.bdrv_co_flush_to_disk = vmdk_co_flush, |
1694 |
.bdrv_co_is_allocated = vmdk_co_is_allocated, |
1695 |
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, |
1696 |
|
1697 |
.create_options = vmdk_create_options, |
1698 |
}; |
1699 |
|
1700 |
static void bdrv_vmdk_init(void) |
1701 |
{ |
1702 |
bdrv_register(&bdrv_vmdk); |
1703 |
} |
1704 |
|
1705 |
block_init(bdrv_vmdk_init); |