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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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#include <zlib.h> |
30 |
|
31 |
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') |
32 |
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') |
33 |
#define VMDK4_COMPRESSION_DEFLATE 1 |
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#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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|
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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 gd_offset; |
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int64_t rgd_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; |
66 |
|
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#define L2_CACHE_SIZE 16 |
68 |
|
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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; |
83 |
|
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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]; |
88 |
|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
91 |
|
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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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} BDRVVmdkState; |
101 |
|
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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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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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} |
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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; |
130 |
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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} |
136 |
p++; |
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continue;
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} |
139 |
if (*p == ' ') { |
140 |
while (p < end && *p == ' ') { |
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p++; |
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} |
143 |
/* skip '\r' if windows line endings used. */
|
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if (p < end && *p == '\r') { |
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p++; |
146 |
} |
147 |
/* only accept blank lines before 'version=' line */
|
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if (p == end || *p != '\n') { |
149 |
return 0; |
150 |
} |
151 |
p++; |
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continue;
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} |
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if (end - p >= strlen("version=X\n")) { |
155 |
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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} |
159 |
} |
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if (end - p >= strlen("version=X\r\n")) { |
161 |
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; |
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} |
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} |
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return 0; |
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} |
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return 0; |
169 |
} |
170 |
} |
171 |
|
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#define CHECK_CID 1 |
173 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ |
176 |
#define BUF_SIZE 4096 |
177 |
#define HEADER_SIZE 512 /* first sector of 512 bytes */ |
178 |
|
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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; |
184 |
|
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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); |
188 |
g_free(e->l2_cache); |
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g_free(e->l1_backup_table); |
190 |
if (e->file != bs->file) {
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bdrv_delete(e->file); |
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} |
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} |
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g_free(s->extents); |
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} |
196 |
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static void vmdk_free_last_extent(BlockDriverState *bs) |
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{ |
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BDRVVmdkState *s = bs->opaque; |
200 |
|
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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--; |
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s->extents = g_realloc(s->extents, s->num_extents * sizeof(VmdkExtent));
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} |
207 |
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
209 |
{ |
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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; |
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size_t cid_str_size; |
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BDRVVmdkState *s = bs->opaque; |
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int ret;
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|
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ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
218 |
if (ret < 0) { |
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return 0; |
220 |
} |
221 |
|
222 |
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"); |
228 |
} |
229 |
|
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desc[DESC_SIZE - 1] = '\0'; |
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p_name = strstr(desc, cid_str); |
232 |
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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} |
236 |
|
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return cid;
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} |
239 |
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
241 |
{ |
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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; |
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int ret;
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|
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ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
248 |
if (ret < 0) { |
249 |
return ret;
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} |
251 |
|
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desc[DESC_SIZE - 1] = '\0'; |
253 |
tmp_str = strstr(desc, "parentCID");
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if (tmp_str == NULL) { |
255 |
return -EINVAL;
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} |
257 |
|
258 |
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) { |
261 |
p_name += sizeof("CID"); |
262 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
263 |
pstrcat(desc, sizeof(desc), tmp_desc);
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} |
265 |
|
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ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); |
267 |
if (ret < 0) { |
268 |
return ret;
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} |
270 |
|
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return 0; |
272 |
} |
273 |
|
274 |
static int vmdk_is_cid_valid(BlockDriverState *bs) |
275 |
{ |
276 |
#ifdef CHECK_CID
|
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BDRVVmdkState *s = bs->opaque; |
278 |
BlockDriverState *p_bs = bs->backing_hd; |
279 |
uint32_t cur_pcid; |
280 |
|
281 |
if (p_bs) {
|
282 |
cur_pcid = vmdk_read_cid(p_bs, 0);
|
283 |
if (s->parent_cid != cur_pcid) {
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284 |
/* CID not valid */
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285 |
return 0; |
286 |
} |
287 |
} |
288 |
#endif
|
289 |
/* CID valid */
|
290 |
return 1; |
291 |
} |
292 |
|
293 |
static int vmdk_parent_open(BlockDriverState *bs) |
294 |
{ |
295 |
char *p_name;
|
296 |
char desc[DESC_SIZE + 1]; |
297 |
BDRVVmdkState *s = bs->opaque; |
298 |
int ret;
|
299 |
|
300 |
desc[DESC_SIZE] = '\0';
|
301 |
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
302 |
if (ret < 0) { |
303 |
return ret;
|
304 |
} |
305 |
|
306 |
p_name = strstr(desc, "parentFileNameHint");
|
307 |
if (p_name != NULL) { |
308 |
char *end_name;
|
309 |
|
310 |
p_name += sizeof("parentFileNameHint") + 1; |
311 |
end_name = strchr(p_name, '\"');
|
312 |
if (end_name == NULL) { |
313 |
return -EINVAL;
|
314 |
} |
315 |
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { |
316 |
return -EINVAL;
|
317 |
} |
318 |
|
319 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
320 |
} |
321 |
|
322 |
return 0; |
323 |
} |
324 |
|
325 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
326 |
* address. return NULL if allocation failed. */
|
327 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
328 |
BlockDriverState *file, bool flat, int64_t sectors,
|
329 |
int64_t l1_offset, int64_t l1_backup_offset, |
330 |
uint32_t l1_size, |
331 |
int l2_size, unsigned int cluster_sectors) |
332 |
{ |
333 |
VmdkExtent *extent; |
334 |
BDRVVmdkState *s = bs->opaque; |
335 |
|
336 |
s->extents = g_realloc(s->extents, |
337 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
338 |
extent = &s->extents[s->num_extents]; |
339 |
s->num_extents++; |
340 |
|
341 |
memset(extent, 0, sizeof(VmdkExtent)); |
342 |
extent->file = file; |
343 |
extent->flat = flat; |
344 |
extent->sectors = sectors; |
345 |
extent->l1_table_offset = l1_offset; |
346 |
extent->l1_backup_table_offset = l1_backup_offset; |
347 |
extent->l1_size = l1_size; |
348 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
349 |
extent->l2_size = l2_size; |
350 |
extent->cluster_sectors = cluster_sectors; |
351 |
|
352 |
if (s->num_extents > 1) { |
353 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
354 |
} else {
|
355 |
extent->end_sector = extent->sectors; |
356 |
} |
357 |
bs->total_sectors = extent->end_sector; |
358 |
return extent;
|
359 |
} |
360 |
|
361 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
362 |
{ |
363 |
int ret;
|
364 |
int l1_size, i;
|
365 |
|
366 |
/* read the L1 table */
|
367 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
368 |
extent->l1_table = g_malloc(l1_size); |
369 |
ret = bdrv_pread(extent->file, |
370 |
extent->l1_table_offset, |
371 |
extent->l1_table, |
372 |
l1_size); |
373 |
if (ret < 0) { |
374 |
goto fail_l1;
|
375 |
} |
376 |
for (i = 0; i < extent->l1_size; i++) { |
377 |
le32_to_cpus(&extent->l1_table[i]); |
378 |
} |
379 |
|
380 |
if (extent->l1_backup_table_offset) {
|
381 |
extent->l1_backup_table = g_malloc(l1_size); |
382 |
ret = bdrv_pread(extent->file, |
383 |
extent->l1_backup_table_offset, |
384 |
extent->l1_backup_table, |
385 |
l1_size); |
386 |
if (ret < 0) { |
387 |
goto fail_l1b;
|
388 |
} |
389 |
for (i = 0; i < extent->l1_size; i++) { |
390 |
le32_to_cpus(&extent->l1_backup_table[i]); |
391 |
} |
392 |
} |
393 |
|
394 |
extent->l2_cache = |
395 |
g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
396 |
return 0; |
397 |
fail_l1b:
|
398 |
g_free(extent->l1_backup_table); |
399 |
fail_l1:
|
400 |
g_free(extent->l1_table); |
401 |
return ret;
|
402 |
} |
403 |
|
404 |
static int vmdk_open_vmdk3(BlockDriverState *bs, |
405 |
BlockDriverState *file, |
406 |
int flags)
|
407 |
{ |
408 |
int ret;
|
409 |
uint32_t magic; |
410 |
VMDK3Header header; |
411 |
VmdkExtent *extent; |
412 |
|
413 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
414 |
if (ret < 0) { |
415 |
return ret;
|
416 |
} |
417 |
extent = vmdk_add_extent(bs, |
418 |
bs->file, false,
|
419 |
le32_to_cpu(header.disk_sectors), |
420 |
le32_to_cpu(header.l1dir_offset) << 9,
|
421 |
0, 1 << 6, 1 << 9, |
422 |
le32_to_cpu(header.granularity)); |
423 |
ret = vmdk_init_tables(bs, extent); |
424 |
if (ret) {
|
425 |
/* free extent allocated by vmdk_add_extent */
|
426 |
vmdk_free_last_extent(bs); |
427 |
} |
428 |
return ret;
|
429 |
} |
430 |
|
431 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
432 |
int64_t desc_offset); |
433 |
|
434 |
static int vmdk_open_vmdk4(BlockDriverState *bs, |
435 |
BlockDriverState *file, |
436 |
int flags)
|
437 |
{ |
438 |
int ret;
|
439 |
uint32_t magic; |
440 |
uint32_t l1_size, l1_entry_sectors; |
441 |
VMDK4Header header; |
442 |
VmdkExtent *extent; |
443 |
int64_t l1_backup_offset = 0;
|
444 |
|
445 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
446 |
if (ret < 0) { |
447 |
return ret;
|
448 |
} |
449 |
if (header.capacity == 0 && header.desc_offset) { |
450 |
return vmdk_open_desc_file(bs, flags, header.desc_offset << 9); |
451 |
} |
452 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
453 |
* le64_to_cpu(header.granularity); |
454 |
if (l1_entry_sectors <= 0) { |
455 |
return -EINVAL;
|
456 |
} |
457 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
458 |
/ l1_entry_sectors; |
459 |
if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
|
460 |
l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
|
461 |
} |
462 |
extent = vmdk_add_extent(bs, file, false,
|
463 |
le64_to_cpu(header.capacity), |
464 |
le64_to_cpu(header.gd_offset) << 9,
|
465 |
l1_backup_offset, |
466 |
l1_size, |
467 |
le32_to_cpu(header.num_gtes_per_gte), |
468 |
le64_to_cpu(header.granularity)); |
469 |
extent->compressed = |
470 |
le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; |
471 |
extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; |
472 |
ret = vmdk_init_tables(bs, extent); |
473 |
if (ret) {
|
474 |
/* free extent allocated by vmdk_add_extent */
|
475 |
vmdk_free_last_extent(bs); |
476 |
} |
477 |
return ret;
|
478 |
} |
479 |
|
480 |
/* find an option value out of descriptor file */
|
481 |
static int vmdk_parse_description(const char *desc, const char *opt_name, |
482 |
char *buf, int buf_size) |
483 |
{ |
484 |
char *opt_pos, *opt_end;
|
485 |
const char *end = desc + strlen(desc); |
486 |
|
487 |
opt_pos = strstr(desc, opt_name); |
488 |
if (!opt_pos) {
|
489 |
return -1; |
490 |
} |
491 |
/* Skip "=\"" following opt_name */
|
492 |
opt_pos += strlen(opt_name) + 2;
|
493 |
if (opt_pos >= end) {
|
494 |
return -1; |
495 |
} |
496 |
opt_end = opt_pos; |
497 |
while (opt_end < end && *opt_end != '"') { |
498 |
opt_end++; |
499 |
} |
500 |
if (opt_end == end || buf_size < opt_end - opt_pos + 1) { |
501 |
return -1; |
502 |
} |
503 |
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
504 |
return 0; |
505 |
} |
506 |
|
507 |
/* Open an extent file and append to bs array */
|
508 |
static int vmdk_open_sparse(BlockDriverState *bs, |
509 |
BlockDriverState *file, |
510 |
int flags)
|
511 |
{ |
512 |
uint32_t magic; |
513 |
|
514 |
if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
515 |
return -EIO;
|
516 |
} |
517 |
|
518 |
magic = be32_to_cpu(magic); |
519 |
switch (magic) {
|
520 |
case VMDK3_MAGIC:
|
521 |
return vmdk_open_vmdk3(bs, file, flags);
|
522 |
break;
|
523 |
case VMDK4_MAGIC:
|
524 |
return vmdk_open_vmdk4(bs, file, flags);
|
525 |
break;
|
526 |
default:
|
527 |
return -EINVAL;
|
528 |
break;
|
529 |
} |
530 |
} |
531 |
|
532 |
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, |
533 |
const char *desc_file_path) |
534 |
{ |
535 |
int ret;
|
536 |
char access[11]; |
537 |
char type[11]; |
538 |
char fname[512]; |
539 |
const char *p = desc; |
540 |
int64_t sectors = 0;
|
541 |
int64_t flat_offset; |
542 |
char extent_path[PATH_MAX];
|
543 |
BlockDriverState *extent_file; |
544 |
|
545 |
while (*p) {
|
546 |
/* parse extent line:
|
547 |
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
548 |
* or
|
549 |
* RW [size in sectors] SPARSE "file-name.vmdk"
|
550 |
*/
|
551 |
flat_offset = -1;
|
552 |
ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, |
553 |
access, §ors, type, fname, &flat_offset); |
554 |
if (ret < 4 || strcmp(access, "RW")) { |
555 |
goto next_line;
|
556 |
} else if (!strcmp(type, "FLAT")) { |
557 |
if (ret != 5 || flat_offset < 0) { |
558 |
return -EINVAL;
|
559 |
} |
560 |
} else if (ret != 4) { |
561 |
return -EINVAL;
|
562 |
} |
563 |
|
564 |
/* trim the quotation marks around */
|
565 |
if (fname[0] == '"') { |
566 |
memmove(fname, fname + 1, strlen(fname));
|
567 |
if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { |
568 |
return -EINVAL;
|
569 |
} |
570 |
fname[strlen(fname) - 1] = '\0'; |
571 |
} |
572 |
if (sectors <= 0 || |
573 |
(strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || |
574 |
(strcmp(access, "RW"))) {
|
575 |
goto next_line;
|
576 |
} |
577 |
|
578 |
path_combine(extent_path, sizeof(extent_path),
|
579 |
desc_file_path, fname); |
580 |
ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); |
581 |
if (ret) {
|
582 |
return ret;
|
583 |
} |
584 |
|
585 |
/* save to extents array */
|
586 |
if (!strcmp(type, "FLAT")) { |
587 |
/* FLAT extent */
|
588 |
VmdkExtent *extent; |
589 |
|
590 |
extent = vmdk_add_extent(bs, extent_file, true, sectors,
|
591 |
0, 0, 0, 0, sectors); |
592 |
extent->flat_start_offset = flat_offset << 9;
|
593 |
} else if (!strcmp(type, "SPARSE")) { |
594 |
/* SPARSE extent */
|
595 |
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags); |
596 |
if (ret) {
|
597 |
bdrv_delete(extent_file); |
598 |
return ret;
|
599 |
} |
600 |
} else {
|
601 |
fprintf(stderr, |
602 |
"VMDK: Not supported extent type \"%s\""".\n", type); |
603 |
return -ENOTSUP;
|
604 |
} |
605 |
next_line:
|
606 |
/* move to next line */
|
607 |
while (*p && *p != '\n') { |
608 |
p++; |
609 |
} |
610 |
p++; |
611 |
} |
612 |
return 0; |
613 |
} |
614 |
|
615 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
616 |
int64_t desc_offset) |
617 |
{ |
618 |
int ret;
|
619 |
char buf[2048]; |
620 |
char ct[128]; |
621 |
BDRVVmdkState *s = bs->opaque; |
622 |
|
623 |
ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf));
|
624 |
if (ret < 0) { |
625 |
return ret;
|
626 |
} |
627 |
buf[2047] = '\0'; |
628 |
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { |
629 |
return -EINVAL;
|
630 |
} |
631 |
if (strcmp(ct, "monolithicFlat") && |
632 |
strcmp(ct, "twoGbMaxExtentSparse") &&
|
633 |
strcmp(ct, "twoGbMaxExtentFlat")) {
|
634 |
fprintf(stderr, |
635 |
"VMDK: Not supported image type \"%s\""".\n", ct); |
636 |
return -ENOTSUP;
|
637 |
} |
638 |
s->desc_offset = 0;
|
639 |
return vmdk_parse_extents(buf, bs, bs->file->filename);
|
640 |
} |
641 |
|
642 |
static int vmdk_open(BlockDriverState *bs, int flags) |
643 |
{ |
644 |
int ret;
|
645 |
BDRVVmdkState *s = bs->opaque; |
646 |
|
647 |
if (vmdk_open_sparse(bs, bs->file, flags) == 0) { |
648 |
s->desc_offset = 0x200;
|
649 |
} else {
|
650 |
ret = vmdk_open_desc_file(bs, flags, 0);
|
651 |
if (ret) {
|
652 |
goto fail;
|
653 |
} |
654 |
} |
655 |
/* try to open parent images, if exist */
|
656 |
ret = vmdk_parent_open(bs); |
657 |
if (ret) {
|
658 |
goto fail;
|
659 |
} |
660 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
661 |
qemu_co_mutex_init(&s->lock); |
662 |
return ret;
|
663 |
|
664 |
fail:
|
665 |
vmdk_free_extents(bs); |
666 |
return ret;
|
667 |
} |
668 |
|
669 |
static int get_whole_cluster(BlockDriverState *bs, |
670 |
VmdkExtent *extent, |
671 |
uint64_t cluster_offset, |
672 |
uint64_t offset, |
673 |
bool allocate)
|
674 |
{ |
675 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
676 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
677 |
|
678 |
/* we will be here if it's first write on non-exist grain(cluster).
|
679 |
* try to read from parent image, if exist */
|
680 |
if (bs->backing_hd) {
|
681 |
int ret;
|
682 |
|
683 |
if (!vmdk_is_cid_valid(bs)) {
|
684 |
return -1; |
685 |
} |
686 |
|
687 |
/* floor offset to cluster */
|
688 |
offset -= offset % (extent->cluster_sectors * 512);
|
689 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
690 |
extent->cluster_sectors); |
691 |
if (ret < 0) { |
692 |
return -1; |
693 |
} |
694 |
|
695 |
/* Write grain only into the active image */
|
696 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
697 |
extent->cluster_sectors); |
698 |
if (ret < 0) { |
699 |
return -1; |
700 |
} |
701 |
} |
702 |
return 0; |
703 |
} |
704 |
|
705 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
706 |
{ |
707 |
/* update L2 table */
|
708 |
if (bdrv_pwrite_sync(
|
709 |
extent->file, |
710 |
((int64_t)m_data->l2_offset * 512)
|
711 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
712 |
&(m_data->offset), |
713 |
sizeof(m_data->offset)
|
714 |
) < 0) {
|
715 |
return -1; |
716 |
} |
717 |
/* update backup L2 table */
|
718 |
if (extent->l1_backup_table_offset != 0) { |
719 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
720 |
if (bdrv_pwrite_sync(
|
721 |
extent->file, |
722 |
((int64_t)m_data->l2_offset * 512)
|
723 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
724 |
&(m_data->offset), sizeof(m_data->offset)
|
725 |
) < 0) {
|
726 |
return -1; |
727 |
} |
728 |
} |
729 |
|
730 |
return 0; |
731 |
} |
732 |
|
733 |
static int get_cluster_offset(BlockDriverState *bs, |
734 |
VmdkExtent *extent, |
735 |
VmdkMetaData *m_data, |
736 |
uint64_t offset, |
737 |
int allocate,
|
738 |
uint64_t *cluster_offset) |
739 |
{ |
740 |
unsigned int l1_index, l2_offset, l2_index; |
741 |
int min_index, i, j;
|
742 |
uint32_t min_count, *l2_table, tmp = 0;
|
743 |
|
744 |
if (m_data) {
|
745 |
m_data->valid = 0;
|
746 |
} |
747 |
if (extent->flat) {
|
748 |
*cluster_offset = extent->flat_start_offset; |
749 |
return 0; |
750 |
} |
751 |
|
752 |
offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; |
753 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
754 |
if (l1_index >= extent->l1_size) {
|
755 |
return -1; |
756 |
} |
757 |
l2_offset = extent->l1_table[l1_index]; |
758 |
if (!l2_offset) {
|
759 |
return -1; |
760 |
} |
761 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
762 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
763 |
/* increment the hit count */
|
764 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
765 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
766 |
extent->l2_cache_counts[j] >>= 1;
|
767 |
} |
768 |
} |
769 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
770 |
goto found;
|
771 |
} |
772 |
} |
773 |
/* not found: load a new entry in the least used one */
|
774 |
min_index = 0;
|
775 |
min_count = 0xffffffff;
|
776 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
777 |
if (extent->l2_cache_counts[i] < min_count) {
|
778 |
min_count = extent->l2_cache_counts[i]; |
779 |
min_index = i; |
780 |
} |
781 |
} |
782 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
783 |
if (bdrv_pread(
|
784 |
extent->file, |
785 |
(int64_t)l2_offset * 512,
|
786 |
l2_table, |
787 |
extent->l2_size * sizeof(uint32_t)
|
788 |
) != extent->l2_size * sizeof(uint32_t)) {
|
789 |
return -1; |
790 |
} |
791 |
|
792 |
extent->l2_cache_offsets[min_index] = l2_offset; |
793 |
extent->l2_cache_counts[min_index] = 1;
|
794 |
found:
|
795 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
796 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
797 |
|
798 |
if (!*cluster_offset) {
|
799 |
if (!allocate) {
|
800 |
return -1; |
801 |
} |
802 |
|
803 |
/* Avoid the L2 tables update for the images that have snapshots. */
|
804 |
*cluster_offset = bdrv_getlength(extent->file); |
805 |
if (!extent->compressed) {
|
806 |
bdrv_truncate( |
807 |
extent->file, |
808 |
*cluster_offset + (extent->cluster_sectors << 9)
|
809 |
); |
810 |
} |
811 |
|
812 |
*cluster_offset >>= 9;
|
813 |
tmp = cpu_to_le32(*cluster_offset); |
814 |
l2_table[l2_index] = tmp; |
815 |
|
816 |
/* First of all we write grain itself, to avoid race condition
|
817 |
* that may to corrupt the image.
|
818 |
* This problem may occur because of insufficient space on host disk
|
819 |
* or inappropriate VM shutdown.
|
820 |
*/
|
821 |
if (get_whole_cluster(
|
822 |
bs, extent, *cluster_offset, offset, allocate) == -1) {
|
823 |
return -1; |
824 |
} |
825 |
|
826 |
if (m_data) {
|
827 |
m_data->offset = tmp; |
828 |
m_data->l1_index = l1_index; |
829 |
m_data->l2_index = l2_index; |
830 |
m_data->l2_offset = l2_offset; |
831 |
m_data->valid = 1;
|
832 |
} |
833 |
} |
834 |
*cluster_offset <<= 9;
|
835 |
return 0; |
836 |
} |
837 |
|
838 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
839 |
int64_t sector_num, VmdkExtent *start_hint) |
840 |
{ |
841 |
VmdkExtent *extent = start_hint; |
842 |
|
843 |
if (!extent) {
|
844 |
extent = &s->extents[0];
|
845 |
} |
846 |
while (extent < &s->extents[s->num_extents]) {
|
847 |
if (sector_num < extent->end_sector) {
|
848 |
return extent;
|
849 |
} |
850 |
extent++; |
851 |
} |
852 |
return NULL; |
853 |
} |
854 |
|
855 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
856 |
int nb_sectors, int *pnum) |
857 |
{ |
858 |
BDRVVmdkState *s = bs->opaque; |
859 |
int64_t index_in_cluster, n, ret; |
860 |
uint64_t offset; |
861 |
VmdkExtent *extent; |
862 |
|
863 |
extent = find_extent(s, sector_num, NULL);
|
864 |
if (!extent) {
|
865 |
return 0; |
866 |
} |
867 |
ret = get_cluster_offset(bs, extent, NULL,
|
868 |
sector_num * 512, 0, &offset); |
869 |
/* get_cluster_offset returning 0 means success */
|
870 |
ret = !ret; |
871 |
|
872 |
index_in_cluster = sector_num % extent->cluster_sectors; |
873 |
n = extent->cluster_sectors - index_in_cluster; |
874 |
if (n > nb_sectors) {
|
875 |
n = nb_sectors; |
876 |
} |
877 |
*pnum = n; |
878 |
return ret;
|
879 |
} |
880 |
|
881 |
static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, |
882 |
int64_t offset_in_cluster, const uint8_t *buf,
|
883 |
int nb_sectors, int64_t sector_num)
|
884 |
{ |
885 |
int ret;
|
886 |
VmdkGrainMarker *data = NULL;
|
887 |
uLongf buf_len; |
888 |
const uint8_t *write_buf = buf;
|
889 |
int write_len = nb_sectors * 512; |
890 |
|
891 |
if (extent->compressed) {
|
892 |
if (!extent->has_marker) {
|
893 |
ret = -EINVAL; |
894 |
goto out;
|
895 |
} |
896 |
buf_len = (extent->cluster_sectors << 9) * 2; |
897 |
data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
|
898 |
if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || |
899 |
buf_len == 0) {
|
900 |
ret = -EINVAL; |
901 |
goto out;
|
902 |
} |
903 |
data->lba = sector_num; |
904 |
data->size = buf_len; |
905 |
write_buf = (uint8_t *)data; |
906 |
write_len = buf_len + sizeof(VmdkGrainMarker);
|
907 |
} |
908 |
ret = bdrv_pwrite(extent->file, |
909 |
cluster_offset + offset_in_cluster, |
910 |
write_buf, |
911 |
write_len); |
912 |
if (ret != write_len) {
|
913 |
ret = ret < 0 ? ret : -EIO;
|
914 |
goto out;
|
915 |
} |
916 |
ret = 0;
|
917 |
out:
|
918 |
g_free(data); |
919 |
return ret;
|
920 |
} |
921 |
|
922 |
static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, |
923 |
int64_t offset_in_cluster, uint8_t *buf, |
924 |
int nb_sectors)
|
925 |
{ |
926 |
int ret;
|
927 |
int cluster_bytes, buf_bytes;
|
928 |
uint8_t *cluster_buf, *compressed_data; |
929 |
uint8_t *uncomp_buf; |
930 |
uint32_t data_len; |
931 |
VmdkGrainMarker *marker; |
932 |
uLongf buf_len; |
933 |
|
934 |
|
935 |
if (!extent->compressed) {
|
936 |
ret = bdrv_pread(extent->file, |
937 |
cluster_offset + offset_in_cluster, |
938 |
buf, nb_sectors * 512);
|
939 |
if (ret == nb_sectors * 512) { |
940 |
return 0; |
941 |
} else {
|
942 |
return -EIO;
|
943 |
} |
944 |
} |
945 |
cluster_bytes = extent->cluster_sectors * 512;
|
946 |
/* Read two clusters in case GrainMarker + compressed data > one cluster */
|
947 |
buf_bytes = cluster_bytes * 2;
|
948 |
cluster_buf = g_malloc(buf_bytes); |
949 |
uncomp_buf = g_malloc(cluster_bytes); |
950 |
ret = bdrv_pread(extent->file, |
951 |
cluster_offset, |
952 |
cluster_buf, buf_bytes); |
953 |
if (ret < 0) { |
954 |
goto out;
|
955 |
} |
956 |
compressed_data = cluster_buf; |
957 |
buf_len = cluster_bytes; |
958 |
data_len = cluster_bytes; |
959 |
if (extent->has_marker) {
|
960 |
marker = (VmdkGrainMarker *)cluster_buf; |
961 |
compressed_data = marker->data; |
962 |
data_len = le32_to_cpu(marker->size); |
963 |
} |
964 |
if (!data_len || data_len > buf_bytes) {
|
965 |
ret = -EINVAL; |
966 |
goto out;
|
967 |
} |
968 |
ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); |
969 |
if (ret != Z_OK) {
|
970 |
ret = -EINVAL; |
971 |
goto out;
|
972 |
|
973 |
} |
974 |
if (offset_in_cluster < 0 || |
975 |
offset_in_cluster + nb_sectors * 512 > buf_len) {
|
976 |
ret = -EINVAL; |
977 |
goto out;
|
978 |
} |
979 |
memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512);
|
980 |
ret = 0;
|
981 |
|
982 |
out:
|
983 |
g_free(uncomp_buf); |
984 |
g_free(cluster_buf); |
985 |
return ret;
|
986 |
} |
987 |
|
988 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
989 |
uint8_t *buf, int nb_sectors)
|
990 |
{ |
991 |
BDRVVmdkState *s = bs->opaque; |
992 |
int ret;
|
993 |
uint64_t n, index_in_cluster; |
994 |
VmdkExtent *extent = NULL;
|
995 |
uint64_t cluster_offset; |
996 |
|
997 |
while (nb_sectors > 0) { |
998 |
extent = find_extent(s, sector_num, extent); |
999 |
if (!extent) {
|
1000 |
return -EIO;
|
1001 |
} |
1002 |
ret = get_cluster_offset( |
1003 |
bs, extent, NULL,
|
1004 |
sector_num << 9, 0, &cluster_offset); |
1005 |
index_in_cluster = sector_num % extent->cluster_sectors; |
1006 |
n = extent->cluster_sectors - index_in_cluster; |
1007 |
if (n > nb_sectors) {
|
1008 |
n = nb_sectors; |
1009 |
} |
1010 |
if (ret) {
|
1011 |
/* if not allocated, try to read from parent image, if exist */
|
1012 |
if (bs->backing_hd) {
|
1013 |
if (!vmdk_is_cid_valid(bs)) {
|
1014 |
return -EINVAL;
|
1015 |
} |
1016 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
1017 |
if (ret < 0) { |
1018 |
return ret;
|
1019 |
} |
1020 |
} else {
|
1021 |
memset(buf, 0, 512 * n); |
1022 |
} |
1023 |
} else {
|
1024 |
ret = vmdk_read_extent(extent, |
1025 |
cluster_offset, index_in_cluster * 512,
|
1026 |
buf, n); |
1027 |
if (ret) {
|
1028 |
return ret;
|
1029 |
} |
1030 |
} |
1031 |
nb_sectors -= n; |
1032 |
sector_num += n; |
1033 |
buf += n * 512;
|
1034 |
} |
1035 |
return 0; |
1036 |
} |
1037 |
|
1038 |
static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, |
1039 |
uint8_t *buf, int nb_sectors)
|
1040 |
{ |
1041 |
int ret;
|
1042 |
BDRVVmdkState *s = bs->opaque; |
1043 |
qemu_co_mutex_lock(&s->lock); |
1044 |
ret = vmdk_read(bs, sector_num, buf, nb_sectors); |
1045 |
qemu_co_mutex_unlock(&s->lock); |
1046 |
return ret;
|
1047 |
} |
1048 |
|
1049 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
1050 |
const uint8_t *buf, int nb_sectors) |
1051 |
{ |
1052 |
BDRVVmdkState *s = bs->opaque; |
1053 |
VmdkExtent *extent = NULL;
|
1054 |
int n, ret;
|
1055 |
int64_t index_in_cluster; |
1056 |
uint64_t cluster_offset; |
1057 |
VmdkMetaData m_data; |
1058 |
|
1059 |
if (sector_num > bs->total_sectors) {
|
1060 |
fprintf(stderr, |
1061 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
1062 |
" total_sectors=0x%" PRIx64 "\n", |
1063 |
sector_num, bs->total_sectors); |
1064 |
return -EIO;
|
1065 |
} |
1066 |
|
1067 |
while (nb_sectors > 0) { |
1068 |
extent = find_extent(s, sector_num, extent); |
1069 |
if (!extent) {
|
1070 |
return -EIO;
|
1071 |
} |
1072 |
ret = get_cluster_offset( |
1073 |
bs, |
1074 |
extent, |
1075 |
&m_data, |
1076 |
sector_num << 9, !extent->compressed,
|
1077 |
&cluster_offset); |
1078 |
if (extent->compressed) {
|
1079 |
if (ret == 0) { |
1080 |
/* Refuse write to allocated cluster for streamOptimized */
|
1081 |
fprintf(stderr, |
1082 |
"VMDK: can't write to allocated cluster"
|
1083 |
" for streamOptimized\n");
|
1084 |
return -EIO;
|
1085 |
} else {
|
1086 |
/* allocate */
|
1087 |
ret = get_cluster_offset( |
1088 |
bs, |
1089 |
extent, |
1090 |
&m_data, |
1091 |
sector_num << 9, 1, |
1092 |
&cluster_offset); |
1093 |
} |
1094 |
} |
1095 |
if (ret) {
|
1096 |
return -EINVAL;
|
1097 |
} |
1098 |
index_in_cluster = sector_num % extent->cluster_sectors; |
1099 |
n = extent->cluster_sectors - index_in_cluster; |
1100 |
if (n > nb_sectors) {
|
1101 |
n = nb_sectors; |
1102 |
} |
1103 |
|
1104 |
ret = vmdk_write_extent(extent, |
1105 |
cluster_offset, index_in_cluster * 512,
|
1106 |
buf, n, sector_num); |
1107 |
if (ret) {
|
1108 |
return ret;
|
1109 |
} |
1110 |
if (m_data.valid) {
|
1111 |
/* update L2 tables */
|
1112 |
if (vmdk_L2update(extent, &m_data) == -1) { |
1113 |
return -EIO;
|
1114 |
} |
1115 |
} |
1116 |
nb_sectors -= n; |
1117 |
sector_num += n; |
1118 |
buf += n * 512;
|
1119 |
|
1120 |
/* update CID on the first write every time the virtual disk is
|
1121 |
* opened */
|
1122 |
if (!s->cid_updated) {
|
1123 |
ret = vmdk_write_cid(bs, time(NULL));
|
1124 |
if (ret < 0) { |
1125 |
return ret;
|
1126 |
} |
1127 |
s->cid_updated = true;
|
1128 |
} |
1129 |
} |
1130 |
return 0; |
1131 |
} |
1132 |
|
1133 |
static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, |
1134 |
const uint8_t *buf, int nb_sectors) |
1135 |
{ |
1136 |
int ret;
|
1137 |
BDRVVmdkState *s = bs->opaque; |
1138 |
qemu_co_mutex_lock(&s->lock); |
1139 |
ret = vmdk_write(bs, sector_num, buf, nb_sectors); |
1140 |
qemu_co_mutex_unlock(&s->lock); |
1141 |
return ret;
|
1142 |
} |
1143 |
|
1144 |
|
1145 |
static int vmdk_create_extent(const char *filename, int64_t filesize, |
1146 |
bool flat, bool compress) |
1147 |
{ |
1148 |
int ret, i;
|
1149 |
int fd = 0; |
1150 |
VMDK4Header header; |
1151 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
1152 |
|
1153 |
fd = open( |
1154 |
filename, |
1155 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1156 |
0644);
|
1157 |
if (fd < 0) { |
1158 |
return -errno;
|
1159 |
} |
1160 |
if (flat) {
|
1161 |
ret = ftruncate(fd, filesize); |
1162 |
if (ret < 0) { |
1163 |
ret = -errno; |
1164 |
} |
1165 |
goto exit;
|
1166 |
} |
1167 |
magic = cpu_to_be32(VMDK4_MAGIC); |
1168 |
memset(&header, 0, sizeof(header)); |
1169 |
header.version = 1;
|
1170 |
header.flags = |
1171 |
3 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0); |
1172 |
header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
|
1173 |
header.capacity = filesize / 512;
|
1174 |
header.granularity = 128;
|
1175 |
header.num_gtes_per_gte = 512;
|
1176 |
|
1177 |
grains = (filesize / 512 + header.granularity - 1) / header.granularity; |
1178 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
1179 |
gt_count = |
1180 |
(grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
1181 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
1182 |
|
1183 |
header.desc_offset = 1;
|
1184 |
header.desc_size = 20;
|
1185 |
header.rgd_offset = header.desc_offset + header.desc_size; |
1186 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
1187 |
header.grain_offset = |
1188 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
1189 |
header.granularity - 1) / header.granularity) *
|
1190 |
header.granularity; |
1191 |
/* swap endianness for all header fields */
|
1192 |
header.version = cpu_to_le32(header.version); |
1193 |
header.flags = cpu_to_le32(header.flags); |
1194 |
header.capacity = cpu_to_le64(header.capacity); |
1195 |
header.granularity = cpu_to_le64(header.granularity); |
1196 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
1197 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
1198 |
header.desc_size = cpu_to_le64(header.desc_size); |
1199 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
1200 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
1201 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
1202 |
header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); |
1203 |
|
1204 |
header.check_bytes[0] = 0xa; |
1205 |
header.check_bytes[1] = 0x20; |
1206 |
header.check_bytes[2] = 0xd; |
1207 |
header.check_bytes[3] = 0xa; |
1208 |
|
1209 |
/* write all the data */
|
1210 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
1211 |
if (ret != sizeof(magic)) { |
1212 |
ret = -errno; |
1213 |
goto exit;
|
1214 |
} |
1215 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
1216 |
if (ret != sizeof(header)) { |
1217 |
ret = -errno; |
1218 |
goto exit;
|
1219 |
} |
1220 |
|
1221 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
1222 |
if (ret < 0) { |
1223 |
ret = -errno; |
1224 |
goto exit;
|
1225 |
} |
1226 |
|
1227 |
/* write grain directory */
|
1228 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
1229 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
1230 |
i < gt_count; i++, tmp += gt_size) { |
1231 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1232 |
if (ret != sizeof(tmp)) { |
1233 |
ret = -errno; |
1234 |
goto exit;
|
1235 |
} |
1236 |
} |
1237 |
|
1238 |
/* write backup grain directory */
|
1239 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1240 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1241 |
i < gt_count; i++, tmp += gt_size) { |
1242 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1243 |
if (ret != sizeof(tmp)) { |
1244 |
ret = -errno; |
1245 |
goto exit;
|
1246 |
} |
1247 |
} |
1248 |
|
1249 |
ret = 0;
|
1250 |
exit:
|
1251 |
close(fd); |
1252 |
return ret;
|
1253 |
} |
1254 |
|
1255 |
static int filename_decompose(const char *filename, char *path, char *prefix, |
1256 |
char *postfix, size_t buf_len)
|
1257 |
{ |
1258 |
const char *p, *q; |
1259 |
|
1260 |
if (filename == NULL || !strlen(filename)) { |
1261 |
fprintf(stderr, "Vmdk: no filename provided.\n");
|
1262 |
return -1; |
1263 |
} |
1264 |
p = strrchr(filename, '/');
|
1265 |
if (p == NULL) { |
1266 |
p = strrchr(filename, '\\');
|
1267 |
} |
1268 |
if (p == NULL) { |
1269 |
p = strrchr(filename, ':');
|
1270 |
} |
1271 |
if (p != NULL) { |
1272 |
p++; |
1273 |
if (p - filename >= buf_len) {
|
1274 |
return -1; |
1275 |
} |
1276 |
pstrcpy(path, p - filename + 1, filename);
|
1277 |
} else {
|
1278 |
p = filename; |
1279 |
path[0] = '\0'; |
1280 |
} |
1281 |
q = strrchr(p, '.');
|
1282 |
if (q == NULL) { |
1283 |
pstrcpy(prefix, buf_len, p); |
1284 |
postfix[0] = '\0'; |
1285 |
} else {
|
1286 |
if (q - p >= buf_len) {
|
1287 |
return -1; |
1288 |
} |
1289 |
pstrcpy(prefix, q - p + 1, p);
|
1290 |
pstrcpy(postfix, buf_len, q); |
1291 |
} |
1292 |
return 0; |
1293 |
} |
1294 |
|
1295 |
static int relative_path(char *dest, int dest_size, |
1296 |
const char *base, const char *target) |
1297 |
{ |
1298 |
int i = 0; |
1299 |
int n = 0; |
1300 |
const char *p, *q; |
1301 |
#ifdef _WIN32
|
1302 |
const char *sep = "\\"; |
1303 |
#else
|
1304 |
const char *sep = "/"; |
1305 |
#endif
|
1306 |
|
1307 |
if (!(dest && base && target)) {
|
1308 |
return -1; |
1309 |
} |
1310 |
if (path_is_absolute(target)) {
|
1311 |
dest[dest_size - 1] = '\0'; |
1312 |
strncpy(dest, target, dest_size - 1);
|
1313 |
return 0; |
1314 |
} |
1315 |
while (base[i] == target[i]) {
|
1316 |
i++; |
1317 |
} |
1318 |
p = &base[i]; |
1319 |
q = &target[i]; |
1320 |
while (*p) {
|
1321 |
if (*p == *sep) {
|
1322 |
n++; |
1323 |
} |
1324 |
p++; |
1325 |
} |
1326 |
dest[0] = '\0'; |
1327 |
for (; n; n--) {
|
1328 |
pstrcat(dest, dest_size, "..");
|
1329 |
pstrcat(dest, dest_size, sep); |
1330 |
} |
1331 |
pstrcat(dest, dest_size, q); |
1332 |
return 0; |
1333 |
} |
1334 |
|
1335 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
1336 |
{ |
1337 |
int fd, idx = 0; |
1338 |
char desc[BUF_SIZE];
|
1339 |
int64_t total_size = 0, filesize;
|
1340 |
const char *backing_file = NULL; |
1341 |
const char *fmt = NULL; |
1342 |
int flags = 0; |
1343 |
int ret = 0; |
1344 |
bool flat, split, compress;
|
1345 |
char ext_desc_lines[BUF_SIZE] = ""; |
1346 |
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
|
1347 |
const int64_t split_size = 0x80000000; /* VMDK has constant split size */ |
1348 |
const char *desc_extent_line; |
1349 |
char parent_desc_line[BUF_SIZE] = ""; |
1350 |
uint32_t parent_cid = 0xffffffff;
|
1351 |
const char desc_template[] = |
1352 |
"# Disk DescriptorFile\n"
|
1353 |
"version=1\n"
|
1354 |
"CID=%x\n"
|
1355 |
"parentCID=%x\n"
|
1356 |
"createType=\"%s\"\n"
|
1357 |
"%s"
|
1358 |
"\n"
|
1359 |
"# Extent description\n"
|
1360 |
"%s"
|
1361 |
"\n"
|
1362 |
"# The Disk Data Base\n"
|
1363 |
"#DDB\n"
|
1364 |
"\n"
|
1365 |
"ddb.virtualHWVersion = \"%d\"\n"
|
1366 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
1367 |
"ddb.geometry.heads = \"16\"\n"
|
1368 |
"ddb.geometry.sectors = \"63\"\n"
|
1369 |
"ddb.adapterType = \"ide\"\n";
|
1370 |
|
1371 |
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
|
1372 |
return -EINVAL;
|
1373 |
} |
1374 |
/* Read out options */
|
1375 |
while (options && options->name) {
|
1376 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1377 |
total_size = options->value.n; |
1378 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1379 |
backing_file = options->value.s; |
1380 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
1381 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
|
1382 |
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { |
1383 |
fmt = options->value.s; |
1384 |
} |
1385 |
options++; |
1386 |
} |
1387 |
if (!fmt) {
|
1388 |
/* Default format to monolithicSparse */
|
1389 |
fmt = "monolithicSparse";
|
1390 |
} else if (strcmp(fmt, "monolithicFlat") && |
1391 |
strcmp(fmt, "monolithicSparse") &&
|
1392 |
strcmp(fmt, "twoGbMaxExtentSparse") &&
|
1393 |
strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1394 |
strcmp(fmt, "streamOptimized")) {
|
1395 |
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
|
1396 |
return -EINVAL;
|
1397 |
} |
1398 |
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1399 |
strcmp(fmt, "twoGbMaxExtentSparse"));
|
1400 |
flat = !(strcmp(fmt, "monolithicFlat") &&
|
1401 |
strcmp(fmt, "twoGbMaxExtentFlat"));
|
1402 |
compress = !strcmp(fmt, "streamOptimized");
|
1403 |
if (flat) {
|
1404 |
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
1405 |
} else {
|
1406 |
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
1407 |
} |
1408 |
if (flat && backing_file) {
|
1409 |
/* not supporting backing file for flat image */
|
1410 |
return -ENOTSUP;
|
1411 |
} |
1412 |
if (backing_file) {
|
1413 |
char parent_filename[PATH_MAX];
|
1414 |
BlockDriverState *bs = bdrv_new("");
|
1415 |
ret = bdrv_open(bs, backing_file, 0, NULL); |
1416 |
if (ret != 0) { |
1417 |
bdrv_delete(bs); |
1418 |
return ret;
|
1419 |
} |
1420 |
if (strcmp(bs->drv->format_name, "vmdk")) { |
1421 |
bdrv_delete(bs); |
1422 |
return -EINVAL;
|
1423 |
} |
1424 |
parent_cid = vmdk_read_cid(bs, 0);
|
1425 |
bdrv_delete(bs); |
1426 |
relative_path(parent_filename, sizeof(parent_filename),
|
1427 |
filename, backing_file); |
1428 |
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
1429 |
"parentFileNameHint=\"%s\"", parent_filename);
|
1430 |
} |
1431 |
|
1432 |
/* Create extents */
|
1433 |
filesize = total_size; |
1434 |
while (filesize > 0) { |
1435 |
char desc_line[BUF_SIZE];
|
1436 |
char ext_filename[PATH_MAX];
|
1437 |
char desc_filename[PATH_MAX];
|
1438 |
int64_t size = filesize; |
1439 |
|
1440 |
if (split && size > split_size) {
|
1441 |
size = split_size; |
1442 |
} |
1443 |
if (split) {
|
1444 |
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", |
1445 |
prefix, flat ? 'f' : 's', ++idx, postfix); |
1446 |
} else if (flat) { |
1447 |
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", |
1448 |
prefix, postfix); |
1449 |
} else {
|
1450 |
snprintf(desc_filename, sizeof(desc_filename), "%s%s", |
1451 |
prefix, postfix); |
1452 |
} |
1453 |
snprintf(ext_filename, sizeof(ext_filename), "%s%s", |
1454 |
path, desc_filename); |
1455 |
|
1456 |
if (vmdk_create_extent(ext_filename, size, flat, compress)) {
|
1457 |
return -EINVAL;
|
1458 |
} |
1459 |
filesize -= size; |
1460 |
|
1461 |
/* Format description line */
|
1462 |
snprintf(desc_line, sizeof(desc_line),
|
1463 |
desc_extent_line, size / 512, desc_filename);
|
1464 |
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
1465 |
} |
1466 |
/* generate descriptor file */
|
1467 |
snprintf(desc, sizeof(desc), desc_template,
|
1468 |
(unsigned int)time(NULL), |
1469 |
parent_cid, |
1470 |
fmt, |
1471 |
parent_desc_line, |
1472 |
ext_desc_lines, |
1473 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1474 |
total_size / (int64_t)(63 * 16 * 512)); |
1475 |
if (split || flat) {
|
1476 |
fd = open( |
1477 |
filename, |
1478 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1479 |
0644);
|
1480 |
} else {
|
1481 |
fd = open( |
1482 |
filename, |
1483 |
O_WRONLY | O_BINARY | O_LARGEFILE, |
1484 |
0644);
|
1485 |
} |
1486 |
if (fd < 0) { |
1487 |
return -errno;
|
1488 |
} |
1489 |
/* the descriptor offset = 0x200 */
|
1490 |
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { |
1491 |
ret = -errno; |
1492 |
goto exit;
|
1493 |
} |
1494 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1495 |
if (ret != strlen(desc)) {
|
1496 |
ret = -errno; |
1497 |
goto exit;
|
1498 |
} |
1499 |
ret = 0;
|
1500 |
exit:
|
1501 |
close(fd); |
1502 |
return ret;
|
1503 |
} |
1504 |
|
1505 |
static void vmdk_close(BlockDriverState *bs) |
1506 |
{ |
1507 |
vmdk_free_extents(bs); |
1508 |
} |
1509 |
|
1510 |
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) |
1511 |
{ |
1512 |
int i, ret, err;
|
1513 |
BDRVVmdkState *s = bs->opaque; |
1514 |
|
1515 |
ret = bdrv_co_flush(bs->file); |
1516 |
for (i = 0; i < s->num_extents; i++) { |
1517 |
err = bdrv_co_flush(s->extents[i].file); |
1518 |
if (err < 0) { |
1519 |
ret = err; |
1520 |
} |
1521 |
} |
1522 |
return ret;
|
1523 |
} |
1524 |
|
1525 |
static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
|
1526 |
{ |
1527 |
int i;
|
1528 |
int64_t ret = 0;
|
1529 |
int64_t r; |
1530 |
BDRVVmdkState *s = bs->opaque; |
1531 |
|
1532 |
ret = bdrv_get_allocated_file_size(bs->file); |
1533 |
if (ret < 0) { |
1534 |
return ret;
|
1535 |
} |
1536 |
for (i = 0; i < s->num_extents; i++) { |
1537 |
if (s->extents[i].file == bs->file) {
|
1538 |
continue;
|
1539 |
} |
1540 |
r = bdrv_get_allocated_file_size(s->extents[i].file); |
1541 |
if (r < 0) { |
1542 |
return r;
|
1543 |
} |
1544 |
ret += r; |
1545 |
} |
1546 |
return ret;
|
1547 |
} |
1548 |
|
1549 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1550 |
{ |
1551 |
.name = BLOCK_OPT_SIZE, |
1552 |
.type = OPT_SIZE, |
1553 |
.help = "Virtual disk size"
|
1554 |
}, |
1555 |
{ |
1556 |
.name = BLOCK_OPT_BACKING_FILE, |
1557 |
.type = OPT_STRING, |
1558 |
.help = "File name of a base image"
|
1559 |
}, |
1560 |
{ |
1561 |
.name = BLOCK_OPT_COMPAT6, |
1562 |
.type = OPT_FLAG, |
1563 |
.help = "VMDK version 6 image"
|
1564 |
}, |
1565 |
{ |
1566 |
.name = BLOCK_OPT_SUBFMT, |
1567 |
.type = OPT_STRING, |
1568 |
.help = |
1569 |
"VMDK flat extent format, can be one of "
|
1570 |
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
|
1571 |
}, |
1572 |
{ NULL }
|
1573 |
}; |
1574 |
|
1575 |
static BlockDriver bdrv_vmdk = {
|
1576 |
.format_name = "vmdk",
|
1577 |
.instance_size = sizeof(BDRVVmdkState),
|
1578 |
.bdrv_probe = vmdk_probe, |
1579 |
.bdrv_open = vmdk_open, |
1580 |
.bdrv_read = vmdk_co_read, |
1581 |
.bdrv_write = vmdk_co_write, |
1582 |
.bdrv_close = vmdk_close, |
1583 |
.bdrv_create = vmdk_create, |
1584 |
.bdrv_co_flush_to_disk = vmdk_co_flush, |
1585 |
.bdrv_is_allocated = vmdk_is_allocated, |
1586 |
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, |
1587 |
|
1588 |
.create_options = vmdk_create_options, |
1589 |
}; |
1590 |
|
1591 |
static void bdrv_vmdk_init(void) |
1592 |
{ |
1593 |
bdrv_register(&bdrv_vmdk); |
1594 |
} |
1595 |
|
1596 |
block_init(bdrv_vmdk_init); |