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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 "migration.h" |
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#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 |
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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; |
45 |
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; |
67 |
|
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#define L2_CACHE_SIZE 16 |
69 |
|
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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; |
84 |
|
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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]; |
89 |
|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
92 |
|
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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; |
103 |
|
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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; |
132 |
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++; |
137 |
} |
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p++; |
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continue;
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} |
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if (*p == ' ') { |
142 |
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++; |
148 |
} |
149 |
/* 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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} |
156 |
if (end - p >= strlen("version=X\n")) { |
157 |
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; |
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} |
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} |
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return 0; |
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} |
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return 0; |
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} |
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} |
173 |
|
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#define CHECK_CID 1 |
175 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ |
178 |
#define BUF_SIZE 4096 |
179 |
#define HEADER_SIZE 512 /* first sector of 512 bytes */ |
180 |
|
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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); |
190 |
g_free(e->l2_cache); |
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g_free(e->l1_backup_table); |
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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); |
197 |
} |
198 |
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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--; |
207 |
s->extents = g_realloc(s->extents, s->num_extents * sizeof(VmdkExtent));
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} |
209 |
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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; |
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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); |
220 |
if (ret < 0) { |
221 |
return 0; |
222 |
} |
223 |
|
224 |
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"); |
230 |
} |
231 |
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desc[DESC_SIZE - 1] = '\0'; |
233 |
p_name = strstr(desc, cid_str); |
234 |
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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} |
238 |
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return cid;
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} |
241 |
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
243 |
{ |
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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; |
247 |
int ret;
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248 |
|
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ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
250 |
if (ret < 0) { |
251 |
return ret;
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} |
253 |
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desc[DESC_SIZE - 1] = '\0'; |
255 |
tmp_str = strstr(desc, "parentCID");
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if (tmp_str == NULL) { |
257 |
return -EINVAL;
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} |
259 |
|
260 |
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) { |
263 |
p_name += sizeof("CID"); |
264 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
265 |
pstrcat(desc, sizeof(desc), tmp_desc);
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} |
267 |
|
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ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); |
269 |
if (ret < 0) { |
270 |
return ret;
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} |
272 |
|
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return 0; |
274 |
} |
275 |
|
276 |
static int vmdk_is_cid_valid(BlockDriverState *bs) |
277 |
{ |
278 |
#ifdef CHECK_CID
|
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BDRVVmdkState *s = bs->opaque; |
280 |
BlockDriverState *p_bs = bs->backing_hd; |
281 |
uint32_t cur_pcid; |
282 |
|
283 |
if (p_bs) {
|
284 |
cur_pcid = vmdk_read_cid(p_bs, 0);
|
285 |
if (s->parent_cid != cur_pcid) {
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286 |
/* CID not valid */
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287 |
return 0; |
288 |
} |
289 |
} |
290 |
#endif
|
291 |
/* CID valid */
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292 |
return 1; |
293 |
} |
294 |
|
295 |
static int vmdk_parent_open(BlockDriverState *bs) |
296 |
{ |
297 |
char *p_name;
|
298 |
char desc[DESC_SIZE + 1]; |
299 |
BDRVVmdkState *s = bs->opaque; |
300 |
int ret;
|
301 |
|
302 |
desc[DESC_SIZE] = '\0';
|
303 |
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
304 |
if (ret < 0) { |
305 |
return ret;
|
306 |
} |
307 |
|
308 |
p_name = strstr(desc, "parentFileNameHint");
|
309 |
if (p_name != NULL) { |
310 |
char *end_name;
|
311 |
|
312 |
p_name += sizeof("parentFileNameHint") + 1; |
313 |
end_name = strchr(p_name, '\"');
|
314 |
if (end_name == NULL) { |
315 |
return -EINVAL;
|
316 |
} |
317 |
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { |
318 |
return -EINVAL;
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319 |
} |
320 |
|
321 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
322 |
} |
323 |
|
324 |
return 0; |
325 |
} |
326 |
|
327 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
328 |
* address. return NULL if allocation failed. */
|
329 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
330 |
BlockDriverState *file, bool flat, int64_t sectors,
|
331 |
int64_t l1_offset, int64_t l1_backup_offset, |
332 |
uint32_t l1_size, |
333 |
int l2_size, unsigned int cluster_sectors) |
334 |
{ |
335 |
VmdkExtent *extent; |
336 |
BDRVVmdkState *s = bs->opaque; |
337 |
|
338 |
s->extents = g_realloc(s->extents, |
339 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
340 |
extent = &s->extents[s->num_extents]; |
341 |
s->num_extents++; |
342 |
|
343 |
memset(extent, 0, sizeof(VmdkExtent)); |
344 |
extent->file = file; |
345 |
extent->flat = flat; |
346 |
extent->sectors = sectors; |
347 |
extent->l1_table_offset = l1_offset; |
348 |
extent->l1_backup_table_offset = l1_backup_offset; |
349 |
extent->l1_size = l1_size; |
350 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
351 |
extent->l2_size = l2_size; |
352 |
extent->cluster_sectors = cluster_sectors; |
353 |
|
354 |
if (s->num_extents > 1) { |
355 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
356 |
} else {
|
357 |
extent->end_sector = extent->sectors; |
358 |
} |
359 |
bs->total_sectors = extent->end_sector; |
360 |
return extent;
|
361 |
} |
362 |
|
363 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
364 |
{ |
365 |
int ret;
|
366 |
int l1_size, i;
|
367 |
|
368 |
/* read the L1 table */
|
369 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
370 |
extent->l1_table = g_malloc(l1_size); |
371 |
ret = bdrv_pread(extent->file, |
372 |
extent->l1_table_offset, |
373 |
extent->l1_table, |
374 |
l1_size); |
375 |
if (ret < 0) { |
376 |
goto fail_l1;
|
377 |
} |
378 |
for (i = 0; i < extent->l1_size; i++) { |
379 |
le32_to_cpus(&extent->l1_table[i]); |
380 |
} |
381 |
|
382 |
if (extent->l1_backup_table_offset) {
|
383 |
extent->l1_backup_table = g_malloc(l1_size); |
384 |
ret = bdrv_pread(extent->file, |
385 |
extent->l1_backup_table_offset, |
386 |
extent->l1_backup_table, |
387 |
l1_size); |
388 |
if (ret < 0) { |
389 |
goto fail_l1b;
|
390 |
} |
391 |
for (i = 0; i < extent->l1_size; i++) { |
392 |
le32_to_cpus(&extent->l1_backup_table[i]); |
393 |
} |
394 |
} |
395 |
|
396 |
extent->l2_cache = |
397 |
g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
398 |
return 0; |
399 |
fail_l1b:
|
400 |
g_free(extent->l1_backup_table); |
401 |
fail_l1:
|
402 |
g_free(extent->l1_table); |
403 |
return ret;
|
404 |
} |
405 |
|
406 |
static int vmdk_open_vmdk3(BlockDriverState *bs, |
407 |
BlockDriverState *file, |
408 |
int flags)
|
409 |
{ |
410 |
int ret;
|
411 |
uint32_t magic; |
412 |
VMDK3Header header; |
413 |
VmdkExtent *extent; |
414 |
|
415 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
416 |
if (ret < 0) { |
417 |
return ret;
|
418 |
} |
419 |
extent = vmdk_add_extent(bs, |
420 |
bs->file, false,
|
421 |
le32_to_cpu(header.disk_sectors), |
422 |
le32_to_cpu(header.l1dir_offset) << 9,
|
423 |
0, 1 << 6, 1 << 9, |
424 |
le32_to_cpu(header.granularity)); |
425 |
ret = vmdk_init_tables(bs, extent); |
426 |
if (ret) {
|
427 |
/* free extent allocated by vmdk_add_extent */
|
428 |
vmdk_free_last_extent(bs); |
429 |
} |
430 |
return ret;
|
431 |
} |
432 |
|
433 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
434 |
int64_t desc_offset); |
435 |
|
436 |
static int vmdk_open_vmdk4(BlockDriverState *bs, |
437 |
BlockDriverState *file, |
438 |
int flags)
|
439 |
{ |
440 |
int ret;
|
441 |
uint32_t magic; |
442 |
uint32_t l1_size, l1_entry_sectors; |
443 |
VMDK4Header header; |
444 |
VmdkExtent *extent; |
445 |
int64_t l1_backup_offset = 0;
|
446 |
|
447 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
448 |
if (ret < 0) { |
449 |
return ret;
|
450 |
} |
451 |
if (header.capacity == 0 && header.desc_offset) { |
452 |
return vmdk_open_desc_file(bs, flags, header.desc_offset << 9); |
453 |
} |
454 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
455 |
* le64_to_cpu(header.granularity); |
456 |
if (l1_entry_sectors <= 0) { |
457 |
return -EINVAL;
|
458 |
} |
459 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
460 |
/ l1_entry_sectors; |
461 |
if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
|
462 |
l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
|
463 |
} |
464 |
extent = vmdk_add_extent(bs, file, false,
|
465 |
le64_to_cpu(header.capacity), |
466 |
le64_to_cpu(header.gd_offset) << 9,
|
467 |
l1_backup_offset, |
468 |
l1_size, |
469 |
le32_to_cpu(header.num_gtes_per_gte), |
470 |
le64_to_cpu(header.granularity)); |
471 |
extent->compressed = |
472 |
le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; |
473 |
extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; |
474 |
ret = vmdk_init_tables(bs, extent); |
475 |
if (ret) {
|
476 |
/* free extent allocated by vmdk_add_extent */
|
477 |
vmdk_free_last_extent(bs); |
478 |
} |
479 |
return ret;
|
480 |
} |
481 |
|
482 |
/* find an option value out of descriptor file */
|
483 |
static int vmdk_parse_description(const char *desc, const char *opt_name, |
484 |
char *buf, int buf_size) |
485 |
{ |
486 |
char *opt_pos, *opt_end;
|
487 |
const char *end = desc + strlen(desc); |
488 |
|
489 |
opt_pos = strstr(desc, opt_name); |
490 |
if (!opt_pos) {
|
491 |
return -1; |
492 |
} |
493 |
/* Skip "=\"" following opt_name */
|
494 |
opt_pos += strlen(opt_name) + 2;
|
495 |
if (opt_pos >= end) {
|
496 |
return -1; |
497 |
} |
498 |
opt_end = opt_pos; |
499 |
while (opt_end < end && *opt_end != '"') { |
500 |
opt_end++; |
501 |
} |
502 |
if (opt_end == end || buf_size < opt_end - opt_pos + 1) { |
503 |
return -1; |
504 |
} |
505 |
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
506 |
return 0; |
507 |
} |
508 |
|
509 |
/* Open an extent file and append to bs array */
|
510 |
static int vmdk_open_sparse(BlockDriverState *bs, |
511 |
BlockDriverState *file, |
512 |
int flags)
|
513 |
{ |
514 |
uint32_t magic; |
515 |
|
516 |
if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
517 |
return -EIO;
|
518 |
} |
519 |
|
520 |
magic = be32_to_cpu(magic); |
521 |
switch (magic) {
|
522 |
case VMDK3_MAGIC:
|
523 |
return vmdk_open_vmdk3(bs, file, flags);
|
524 |
break;
|
525 |
case VMDK4_MAGIC:
|
526 |
return vmdk_open_vmdk4(bs, file, flags);
|
527 |
break;
|
528 |
default:
|
529 |
return -EINVAL;
|
530 |
break;
|
531 |
} |
532 |
} |
533 |
|
534 |
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, |
535 |
const char *desc_file_path) |
536 |
{ |
537 |
int ret;
|
538 |
char access[11]; |
539 |
char type[11]; |
540 |
char fname[512]; |
541 |
const char *p = desc; |
542 |
int64_t sectors = 0;
|
543 |
int64_t flat_offset; |
544 |
char extent_path[PATH_MAX];
|
545 |
BlockDriverState *extent_file; |
546 |
|
547 |
while (*p) {
|
548 |
/* parse extent line:
|
549 |
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
550 |
* or
|
551 |
* RW [size in sectors] SPARSE "file-name.vmdk"
|
552 |
*/
|
553 |
flat_offset = -1;
|
554 |
ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, |
555 |
access, §ors, type, fname, &flat_offset); |
556 |
if (ret < 4 || strcmp(access, "RW")) { |
557 |
goto next_line;
|
558 |
} else if (!strcmp(type, "FLAT")) { |
559 |
if (ret != 5 || flat_offset < 0) { |
560 |
return -EINVAL;
|
561 |
} |
562 |
} else if (ret != 4) { |
563 |
return -EINVAL;
|
564 |
} |
565 |
|
566 |
/* trim the quotation marks around */
|
567 |
if (fname[0] == '"') { |
568 |
memmove(fname, fname + 1, strlen(fname));
|
569 |
if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { |
570 |
return -EINVAL;
|
571 |
} |
572 |
fname[strlen(fname) - 1] = '\0'; |
573 |
} |
574 |
if (sectors <= 0 || |
575 |
(strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || |
576 |
(strcmp(access, "RW"))) {
|
577 |
goto next_line;
|
578 |
} |
579 |
|
580 |
path_combine(extent_path, sizeof(extent_path),
|
581 |
desc_file_path, fname); |
582 |
ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); |
583 |
if (ret) {
|
584 |
return ret;
|
585 |
} |
586 |
|
587 |
/* save to extents array */
|
588 |
if (!strcmp(type, "FLAT")) { |
589 |
/* FLAT extent */
|
590 |
VmdkExtent *extent; |
591 |
|
592 |
extent = vmdk_add_extent(bs, extent_file, true, sectors,
|
593 |
0, 0, 0, 0, sectors); |
594 |
extent->flat_start_offset = flat_offset << 9;
|
595 |
} else if (!strcmp(type, "SPARSE")) { |
596 |
/* SPARSE extent */
|
597 |
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags); |
598 |
if (ret) {
|
599 |
bdrv_delete(extent_file); |
600 |
return ret;
|
601 |
} |
602 |
} else {
|
603 |
fprintf(stderr, |
604 |
"VMDK: Not supported extent type \"%s\""".\n", type); |
605 |
return -ENOTSUP;
|
606 |
} |
607 |
next_line:
|
608 |
/* move to next line */
|
609 |
while (*p && *p != '\n') { |
610 |
p++; |
611 |
} |
612 |
p++; |
613 |
} |
614 |
return 0; |
615 |
} |
616 |
|
617 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
618 |
int64_t desc_offset) |
619 |
{ |
620 |
int ret;
|
621 |
char buf[2048]; |
622 |
char ct[128]; |
623 |
BDRVVmdkState *s = bs->opaque; |
624 |
|
625 |
ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf));
|
626 |
if (ret < 0) { |
627 |
return ret;
|
628 |
} |
629 |
buf[2047] = '\0'; |
630 |
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { |
631 |
return -EINVAL;
|
632 |
} |
633 |
if (strcmp(ct, "monolithicFlat") && |
634 |
strcmp(ct, "twoGbMaxExtentSparse") &&
|
635 |
strcmp(ct, "twoGbMaxExtentFlat")) {
|
636 |
fprintf(stderr, |
637 |
"VMDK: Not supported image type \"%s\""".\n", ct); |
638 |
return -ENOTSUP;
|
639 |
} |
640 |
s->desc_offset = 0;
|
641 |
return vmdk_parse_extents(buf, bs, bs->file->filename);
|
642 |
} |
643 |
|
644 |
static int vmdk_open(BlockDriverState *bs, int flags) |
645 |
{ |
646 |
int ret;
|
647 |
BDRVVmdkState *s = bs->opaque; |
648 |
|
649 |
if (vmdk_open_sparse(bs, bs->file, flags) == 0) { |
650 |
s->desc_offset = 0x200;
|
651 |
} else {
|
652 |
ret = vmdk_open_desc_file(bs, flags, 0);
|
653 |
if (ret) {
|
654 |
goto fail;
|
655 |
} |
656 |
} |
657 |
/* try to open parent images, if exist */
|
658 |
ret = vmdk_parent_open(bs); |
659 |
if (ret) {
|
660 |
goto fail;
|
661 |
} |
662 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
663 |
qemu_co_mutex_init(&s->lock); |
664 |
|
665 |
/* Disable migration when VMDK images are used */
|
666 |
error_set(&s->migration_blocker, |
667 |
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
668 |
"vmdk", bs->device_name, "live migration"); |
669 |
migrate_add_blocker(s->migration_blocker); |
670 |
|
671 |
return 0; |
672 |
|
673 |
fail:
|
674 |
vmdk_free_extents(bs); |
675 |
return ret;
|
676 |
} |
677 |
|
678 |
static int get_whole_cluster(BlockDriverState *bs, |
679 |
VmdkExtent *extent, |
680 |
uint64_t cluster_offset, |
681 |
uint64_t offset, |
682 |
bool allocate)
|
683 |
{ |
684 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
685 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
686 |
|
687 |
/* we will be here if it's first write on non-exist grain(cluster).
|
688 |
* try to read from parent image, if exist */
|
689 |
if (bs->backing_hd) {
|
690 |
int ret;
|
691 |
|
692 |
if (!vmdk_is_cid_valid(bs)) {
|
693 |
return -1; |
694 |
} |
695 |
|
696 |
/* floor offset to cluster */
|
697 |
offset -= offset % (extent->cluster_sectors * 512);
|
698 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
699 |
extent->cluster_sectors); |
700 |
if (ret < 0) { |
701 |
return -1; |
702 |
} |
703 |
|
704 |
/* Write grain only into the active image */
|
705 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
706 |
extent->cluster_sectors); |
707 |
if (ret < 0) { |
708 |
return -1; |
709 |
} |
710 |
} |
711 |
return 0; |
712 |
} |
713 |
|
714 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
715 |
{ |
716 |
/* update L2 table */
|
717 |
if (bdrv_pwrite_sync(
|
718 |
extent->file, |
719 |
((int64_t)m_data->l2_offset * 512)
|
720 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
721 |
&(m_data->offset), |
722 |
sizeof(m_data->offset)
|
723 |
) < 0) {
|
724 |
return -1; |
725 |
} |
726 |
/* update backup L2 table */
|
727 |
if (extent->l1_backup_table_offset != 0) { |
728 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
729 |
if (bdrv_pwrite_sync(
|
730 |
extent->file, |
731 |
((int64_t)m_data->l2_offset * 512)
|
732 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
733 |
&(m_data->offset), sizeof(m_data->offset)
|
734 |
) < 0) {
|
735 |
return -1; |
736 |
} |
737 |
} |
738 |
|
739 |
return 0; |
740 |
} |
741 |
|
742 |
static int get_cluster_offset(BlockDriverState *bs, |
743 |
VmdkExtent *extent, |
744 |
VmdkMetaData *m_data, |
745 |
uint64_t offset, |
746 |
int allocate,
|
747 |
uint64_t *cluster_offset) |
748 |
{ |
749 |
unsigned int l1_index, l2_offset, l2_index; |
750 |
int min_index, i, j;
|
751 |
uint32_t min_count, *l2_table, tmp = 0;
|
752 |
|
753 |
if (m_data) {
|
754 |
m_data->valid = 0;
|
755 |
} |
756 |
if (extent->flat) {
|
757 |
*cluster_offset = extent->flat_start_offset; |
758 |
return 0; |
759 |
} |
760 |
|
761 |
offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; |
762 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
763 |
if (l1_index >= extent->l1_size) {
|
764 |
return -1; |
765 |
} |
766 |
l2_offset = extent->l1_table[l1_index]; |
767 |
if (!l2_offset) {
|
768 |
return -1; |
769 |
} |
770 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
771 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
772 |
/* increment the hit count */
|
773 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
774 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
775 |
extent->l2_cache_counts[j] >>= 1;
|
776 |
} |
777 |
} |
778 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
779 |
goto found;
|
780 |
} |
781 |
} |
782 |
/* not found: load a new entry in the least used one */
|
783 |
min_index = 0;
|
784 |
min_count = 0xffffffff;
|
785 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
786 |
if (extent->l2_cache_counts[i] < min_count) {
|
787 |
min_count = extent->l2_cache_counts[i]; |
788 |
min_index = i; |
789 |
} |
790 |
} |
791 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
792 |
if (bdrv_pread(
|
793 |
extent->file, |
794 |
(int64_t)l2_offset * 512,
|
795 |
l2_table, |
796 |
extent->l2_size * sizeof(uint32_t)
|
797 |
) != extent->l2_size * sizeof(uint32_t)) {
|
798 |
return -1; |
799 |
} |
800 |
|
801 |
extent->l2_cache_offsets[min_index] = l2_offset; |
802 |
extent->l2_cache_counts[min_index] = 1;
|
803 |
found:
|
804 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
805 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
806 |
|
807 |
if (!*cluster_offset) {
|
808 |
if (!allocate) {
|
809 |
return -1; |
810 |
} |
811 |
|
812 |
/* Avoid the L2 tables update for the images that have snapshots. */
|
813 |
*cluster_offset = bdrv_getlength(extent->file); |
814 |
if (!extent->compressed) {
|
815 |
bdrv_truncate( |
816 |
extent->file, |
817 |
*cluster_offset + (extent->cluster_sectors << 9)
|
818 |
); |
819 |
} |
820 |
|
821 |
*cluster_offset >>= 9;
|
822 |
tmp = cpu_to_le32(*cluster_offset); |
823 |
l2_table[l2_index] = tmp; |
824 |
|
825 |
/* First of all we write grain itself, to avoid race condition
|
826 |
* that may to corrupt the image.
|
827 |
* This problem may occur because of insufficient space on host disk
|
828 |
* or inappropriate VM shutdown.
|
829 |
*/
|
830 |
if (get_whole_cluster(
|
831 |
bs, extent, *cluster_offset, offset, allocate) == -1) {
|
832 |
return -1; |
833 |
} |
834 |
|
835 |
if (m_data) {
|
836 |
m_data->offset = tmp; |
837 |
m_data->l1_index = l1_index; |
838 |
m_data->l2_index = l2_index; |
839 |
m_data->l2_offset = l2_offset; |
840 |
m_data->valid = 1;
|
841 |
} |
842 |
} |
843 |
*cluster_offset <<= 9;
|
844 |
return 0; |
845 |
} |
846 |
|
847 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
848 |
int64_t sector_num, VmdkExtent *start_hint) |
849 |
{ |
850 |
VmdkExtent *extent = start_hint; |
851 |
|
852 |
if (!extent) {
|
853 |
extent = &s->extents[0];
|
854 |
} |
855 |
while (extent < &s->extents[s->num_extents]) {
|
856 |
if (sector_num < extent->end_sector) {
|
857 |
return extent;
|
858 |
} |
859 |
extent++; |
860 |
} |
861 |
return NULL; |
862 |
} |
863 |
|
864 |
static int coroutine_fn vmdk_co_is_allocated(BlockDriverState *bs, |
865 |
int64_t sector_num, int nb_sectors, int *pnum) |
866 |
{ |
867 |
BDRVVmdkState *s = bs->opaque; |
868 |
int64_t index_in_cluster, n, ret; |
869 |
uint64_t offset; |
870 |
VmdkExtent *extent; |
871 |
|
872 |
extent = find_extent(s, sector_num, NULL);
|
873 |
if (!extent) {
|
874 |
return 0; |
875 |
} |
876 |
qemu_co_mutex_lock(&s->lock); |
877 |
ret = get_cluster_offset(bs, extent, NULL,
|
878 |
sector_num * 512, 0, &offset); |
879 |
qemu_co_mutex_unlock(&s->lock); |
880 |
/* get_cluster_offset returning 0 means success */
|
881 |
ret = !ret; |
882 |
|
883 |
index_in_cluster = sector_num % extent->cluster_sectors; |
884 |
n = extent->cluster_sectors - index_in_cluster; |
885 |
if (n > nb_sectors) {
|
886 |
n = nb_sectors; |
887 |
} |
888 |
*pnum = n; |
889 |
return ret;
|
890 |
} |
891 |
|
892 |
static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, |
893 |
int64_t offset_in_cluster, const uint8_t *buf,
|
894 |
int nb_sectors, int64_t sector_num)
|
895 |
{ |
896 |
int ret;
|
897 |
VmdkGrainMarker *data = NULL;
|
898 |
uLongf buf_len; |
899 |
const uint8_t *write_buf = buf;
|
900 |
int write_len = nb_sectors * 512; |
901 |
|
902 |
if (extent->compressed) {
|
903 |
if (!extent->has_marker) {
|
904 |
ret = -EINVAL; |
905 |
goto out;
|
906 |
} |
907 |
buf_len = (extent->cluster_sectors << 9) * 2; |
908 |
data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
|
909 |
if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || |
910 |
buf_len == 0) {
|
911 |
ret = -EINVAL; |
912 |
goto out;
|
913 |
} |
914 |
data->lba = sector_num; |
915 |
data->size = buf_len; |
916 |
write_buf = (uint8_t *)data; |
917 |
write_len = buf_len + sizeof(VmdkGrainMarker);
|
918 |
} |
919 |
ret = bdrv_pwrite(extent->file, |
920 |
cluster_offset + offset_in_cluster, |
921 |
write_buf, |
922 |
write_len); |
923 |
if (ret != write_len) {
|
924 |
ret = ret < 0 ? ret : -EIO;
|
925 |
goto out;
|
926 |
} |
927 |
ret = 0;
|
928 |
out:
|
929 |
g_free(data); |
930 |
return ret;
|
931 |
} |
932 |
|
933 |
static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, |
934 |
int64_t offset_in_cluster, uint8_t *buf, |
935 |
int nb_sectors)
|
936 |
{ |
937 |
int ret;
|
938 |
int cluster_bytes, buf_bytes;
|
939 |
uint8_t *cluster_buf, *compressed_data; |
940 |
uint8_t *uncomp_buf; |
941 |
uint32_t data_len; |
942 |
VmdkGrainMarker *marker; |
943 |
uLongf buf_len; |
944 |
|
945 |
|
946 |
if (!extent->compressed) {
|
947 |
ret = bdrv_pread(extent->file, |
948 |
cluster_offset + offset_in_cluster, |
949 |
buf, nb_sectors * 512);
|
950 |
if (ret == nb_sectors * 512) { |
951 |
return 0; |
952 |
} else {
|
953 |
return -EIO;
|
954 |
} |
955 |
} |
956 |
cluster_bytes = extent->cluster_sectors * 512;
|
957 |
/* Read two clusters in case GrainMarker + compressed data > one cluster */
|
958 |
buf_bytes = cluster_bytes * 2;
|
959 |
cluster_buf = g_malloc(buf_bytes); |
960 |
uncomp_buf = g_malloc(cluster_bytes); |
961 |
ret = bdrv_pread(extent->file, |
962 |
cluster_offset, |
963 |
cluster_buf, buf_bytes); |
964 |
if (ret < 0) { |
965 |
goto out;
|
966 |
} |
967 |
compressed_data = cluster_buf; |
968 |
buf_len = cluster_bytes; |
969 |
data_len = cluster_bytes; |
970 |
if (extent->has_marker) {
|
971 |
marker = (VmdkGrainMarker *)cluster_buf; |
972 |
compressed_data = marker->data; |
973 |
data_len = le32_to_cpu(marker->size); |
974 |
} |
975 |
if (!data_len || data_len > buf_bytes) {
|
976 |
ret = -EINVAL; |
977 |
goto out;
|
978 |
} |
979 |
ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); |
980 |
if (ret != Z_OK) {
|
981 |
ret = -EINVAL; |
982 |
goto out;
|
983 |
|
984 |
} |
985 |
if (offset_in_cluster < 0 || |
986 |
offset_in_cluster + nb_sectors * 512 > buf_len) {
|
987 |
ret = -EINVAL; |
988 |
goto out;
|
989 |
} |
990 |
memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512);
|
991 |
ret = 0;
|
992 |
|
993 |
out:
|
994 |
g_free(uncomp_buf); |
995 |
g_free(cluster_buf); |
996 |
return ret;
|
997 |
} |
998 |
|
999 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
1000 |
uint8_t *buf, int nb_sectors)
|
1001 |
{ |
1002 |
BDRVVmdkState *s = bs->opaque; |
1003 |
int ret;
|
1004 |
uint64_t n, index_in_cluster; |
1005 |
VmdkExtent *extent = NULL;
|
1006 |
uint64_t cluster_offset; |
1007 |
|
1008 |
while (nb_sectors > 0) { |
1009 |
extent = find_extent(s, sector_num, extent); |
1010 |
if (!extent) {
|
1011 |
return -EIO;
|
1012 |
} |
1013 |
ret = get_cluster_offset( |
1014 |
bs, extent, NULL,
|
1015 |
sector_num << 9, 0, &cluster_offset); |
1016 |
index_in_cluster = sector_num % extent->cluster_sectors; |
1017 |
n = extent->cluster_sectors - index_in_cluster; |
1018 |
if (n > nb_sectors) {
|
1019 |
n = nb_sectors; |
1020 |
} |
1021 |
if (ret) {
|
1022 |
/* if not allocated, try to read from parent image, if exist */
|
1023 |
if (bs->backing_hd) {
|
1024 |
if (!vmdk_is_cid_valid(bs)) {
|
1025 |
return -EINVAL;
|
1026 |
} |
1027 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
1028 |
if (ret < 0) { |
1029 |
return ret;
|
1030 |
} |
1031 |
} else {
|
1032 |
memset(buf, 0, 512 * n); |
1033 |
} |
1034 |
} else {
|
1035 |
ret = vmdk_read_extent(extent, |
1036 |
cluster_offset, index_in_cluster * 512,
|
1037 |
buf, n); |
1038 |
if (ret) {
|
1039 |
return ret;
|
1040 |
} |
1041 |
} |
1042 |
nb_sectors -= n; |
1043 |
sector_num += n; |
1044 |
buf += n * 512;
|
1045 |
} |
1046 |
return 0; |
1047 |
} |
1048 |
|
1049 |
static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, |
1050 |
uint8_t *buf, int nb_sectors)
|
1051 |
{ |
1052 |
int ret;
|
1053 |
BDRVVmdkState *s = bs->opaque; |
1054 |
qemu_co_mutex_lock(&s->lock); |
1055 |
ret = vmdk_read(bs, sector_num, buf, nb_sectors); |
1056 |
qemu_co_mutex_unlock(&s->lock); |
1057 |
return ret;
|
1058 |
} |
1059 |
|
1060 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
1061 |
const uint8_t *buf, int nb_sectors) |
1062 |
{ |
1063 |
BDRVVmdkState *s = bs->opaque; |
1064 |
VmdkExtent *extent = NULL;
|
1065 |
int n, ret;
|
1066 |
int64_t index_in_cluster; |
1067 |
uint64_t cluster_offset; |
1068 |
VmdkMetaData m_data; |
1069 |
|
1070 |
if (sector_num > bs->total_sectors) {
|
1071 |
fprintf(stderr, |
1072 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
1073 |
" total_sectors=0x%" PRIx64 "\n", |
1074 |
sector_num, bs->total_sectors); |
1075 |
return -EIO;
|
1076 |
} |
1077 |
|
1078 |
while (nb_sectors > 0) { |
1079 |
extent = find_extent(s, sector_num, extent); |
1080 |
if (!extent) {
|
1081 |
return -EIO;
|
1082 |
} |
1083 |
ret = get_cluster_offset( |
1084 |
bs, |
1085 |
extent, |
1086 |
&m_data, |
1087 |
sector_num << 9, !extent->compressed,
|
1088 |
&cluster_offset); |
1089 |
if (extent->compressed) {
|
1090 |
if (ret == 0) { |
1091 |
/* Refuse write to allocated cluster for streamOptimized */
|
1092 |
fprintf(stderr, |
1093 |
"VMDK: can't write to allocated cluster"
|
1094 |
" for streamOptimized\n");
|
1095 |
return -EIO;
|
1096 |
} else {
|
1097 |
/* allocate */
|
1098 |
ret = get_cluster_offset( |
1099 |
bs, |
1100 |
extent, |
1101 |
&m_data, |
1102 |
sector_num << 9, 1, |
1103 |
&cluster_offset); |
1104 |
} |
1105 |
} |
1106 |
if (ret) {
|
1107 |
return -EINVAL;
|
1108 |
} |
1109 |
index_in_cluster = sector_num % extent->cluster_sectors; |
1110 |
n = extent->cluster_sectors - index_in_cluster; |
1111 |
if (n > nb_sectors) {
|
1112 |
n = nb_sectors; |
1113 |
} |
1114 |
|
1115 |
ret = vmdk_write_extent(extent, |
1116 |
cluster_offset, index_in_cluster * 512,
|
1117 |
buf, n, sector_num); |
1118 |
if (ret) {
|
1119 |
return ret;
|
1120 |
} |
1121 |
if (m_data.valid) {
|
1122 |
/* update L2 tables */
|
1123 |
if (vmdk_L2update(extent, &m_data) == -1) { |
1124 |
return -EIO;
|
1125 |
} |
1126 |
} |
1127 |
nb_sectors -= n; |
1128 |
sector_num += n; |
1129 |
buf += n * 512;
|
1130 |
|
1131 |
/* update CID on the first write every time the virtual disk is
|
1132 |
* opened */
|
1133 |
if (!s->cid_updated) {
|
1134 |
ret = vmdk_write_cid(bs, time(NULL));
|
1135 |
if (ret < 0) { |
1136 |
return ret;
|
1137 |
} |
1138 |
s->cid_updated = true;
|
1139 |
} |
1140 |
} |
1141 |
return 0; |
1142 |
} |
1143 |
|
1144 |
static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, |
1145 |
const uint8_t *buf, int nb_sectors) |
1146 |
{ |
1147 |
int ret;
|
1148 |
BDRVVmdkState *s = bs->opaque; |
1149 |
qemu_co_mutex_lock(&s->lock); |
1150 |
ret = vmdk_write(bs, sector_num, buf, nb_sectors); |
1151 |
qemu_co_mutex_unlock(&s->lock); |
1152 |
return ret;
|
1153 |
} |
1154 |
|
1155 |
|
1156 |
static int vmdk_create_extent(const char *filename, int64_t filesize, |
1157 |
bool flat, bool compress) |
1158 |
{ |
1159 |
int ret, i;
|
1160 |
int fd = 0; |
1161 |
VMDK4Header header; |
1162 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
1163 |
|
1164 |
fd = open( |
1165 |
filename, |
1166 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1167 |
0644);
|
1168 |
if (fd < 0) { |
1169 |
return -errno;
|
1170 |
} |
1171 |
if (flat) {
|
1172 |
ret = ftruncate(fd, filesize); |
1173 |
if (ret < 0) { |
1174 |
ret = -errno; |
1175 |
} |
1176 |
goto exit;
|
1177 |
} |
1178 |
magic = cpu_to_be32(VMDK4_MAGIC); |
1179 |
memset(&header, 0, sizeof(header)); |
1180 |
header.version = 1;
|
1181 |
header.flags = |
1182 |
3 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0); |
1183 |
header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
|
1184 |
header.capacity = filesize / 512;
|
1185 |
header.granularity = 128;
|
1186 |
header.num_gtes_per_gte = 512;
|
1187 |
|
1188 |
grains = (filesize / 512 + header.granularity - 1) / header.granularity; |
1189 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
1190 |
gt_count = |
1191 |
(grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
1192 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
1193 |
|
1194 |
header.desc_offset = 1;
|
1195 |
header.desc_size = 20;
|
1196 |
header.rgd_offset = header.desc_offset + header.desc_size; |
1197 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
1198 |
header.grain_offset = |
1199 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
1200 |
header.granularity - 1) / header.granularity) *
|
1201 |
header.granularity; |
1202 |
/* swap endianness for all header fields */
|
1203 |
header.version = cpu_to_le32(header.version); |
1204 |
header.flags = cpu_to_le32(header.flags); |
1205 |
header.capacity = cpu_to_le64(header.capacity); |
1206 |
header.granularity = cpu_to_le64(header.granularity); |
1207 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
1208 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
1209 |
header.desc_size = cpu_to_le64(header.desc_size); |
1210 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
1211 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
1212 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
1213 |
header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); |
1214 |
|
1215 |
header.check_bytes[0] = 0xa; |
1216 |
header.check_bytes[1] = 0x20; |
1217 |
header.check_bytes[2] = 0xd; |
1218 |
header.check_bytes[3] = 0xa; |
1219 |
|
1220 |
/* write all the data */
|
1221 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
1222 |
if (ret != sizeof(magic)) { |
1223 |
ret = -errno; |
1224 |
goto exit;
|
1225 |
} |
1226 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
1227 |
if (ret != sizeof(header)) { |
1228 |
ret = -errno; |
1229 |
goto exit;
|
1230 |
} |
1231 |
|
1232 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
1233 |
if (ret < 0) { |
1234 |
ret = -errno; |
1235 |
goto exit;
|
1236 |
} |
1237 |
|
1238 |
/* write grain directory */
|
1239 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
1240 |
for (i = 0, tmp = le64_to_cpu(header.rgd_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 |
/* write backup grain directory */
|
1250 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1251 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1252 |
i < gt_count; i++, tmp += gt_size) { |
1253 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1254 |
if (ret != sizeof(tmp)) { |
1255 |
ret = -errno; |
1256 |
goto exit;
|
1257 |
} |
1258 |
} |
1259 |
|
1260 |
ret = 0;
|
1261 |
exit:
|
1262 |
close(fd); |
1263 |
return ret;
|
1264 |
} |
1265 |
|
1266 |
static int filename_decompose(const char *filename, char *path, char *prefix, |
1267 |
char *postfix, size_t buf_len)
|
1268 |
{ |
1269 |
const char *p, *q; |
1270 |
|
1271 |
if (filename == NULL || !strlen(filename)) { |
1272 |
fprintf(stderr, "Vmdk: no filename provided.\n");
|
1273 |
return -1; |
1274 |
} |
1275 |
p = strrchr(filename, '/');
|
1276 |
if (p == NULL) { |
1277 |
p = strrchr(filename, '\\');
|
1278 |
} |
1279 |
if (p == NULL) { |
1280 |
p = strrchr(filename, ':');
|
1281 |
} |
1282 |
if (p != NULL) { |
1283 |
p++; |
1284 |
if (p - filename >= buf_len) {
|
1285 |
return -1; |
1286 |
} |
1287 |
pstrcpy(path, p - filename + 1, filename);
|
1288 |
} else {
|
1289 |
p = filename; |
1290 |
path[0] = '\0'; |
1291 |
} |
1292 |
q = strrchr(p, '.');
|
1293 |
if (q == NULL) { |
1294 |
pstrcpy(prefix, buf_len, p); |
1295 |
postfix[0] = '\0'; |
1296 |
} else {
|
1297 |
if (q - p >= buf_len) {
|
1298 |
return -1; |
1299 |
} |
1300 |
pstrcpy(prefix, q - p + 1, p);
|
1301 |
pstrcpy(postfix, buf_len, q); |
1302 |
} |
1303 |
return 0; |
1304 |
} |
1305 |
|
1306 |
static int relative_path(char *dest, int dest_size, |
1307 |
const char *base, const char *target) |
1308 |
{ |
1309 |
int i = 0; |
1310 |
int n = 0; |
1311 |
const char *p, *q; |
1312 |
#ifdef _WIN32
|
1313 |
const char *sep = "\\"; |
1314 |
#else
|
1315 |
const char *sep = "/"; |
1316 |
#endif
|
1317 |
|
1318 |
if (!(dest && base && target)) {
|
1319 |
return -1; |
1320 |
} |
1321 |
if (path_is_absolute(target)) {
|
1322 |
dest[dest_size - 1] = '\0'; |
1323 |
strncpy(dest, target, dest_size - 1);
|
1324 |
return 0; |
1325 |
} |
1326 |
while (base[i] == target[i]) {
|
1327 |
i++; |
1328 |
} |
1329 |
p = &base[i]; |
1330 |
q = &target[i]; |
1331 |
while (*p) {
|
1332 |
if (*p == *sep) {
|
1333 |
n++; |
1334 |
} |
1335 |
p++; |
1336 |
} |
1337 |
dest[0] = '\0'; |
1338 |
for (; n; n--) {
|
1339 |
pstrcat(dest, dest_size, "..");
|
1340 |
pstrcat(dest, dest_size, sep); |
1341 |
} |
1342 |
pstrcat(dest, dest_size, q); |
1343 |
return 0; |
1344 |
} |
1345 |
|
1346 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
1347 |
{ |
1348 |
int fd, idx = 0; |
1349 |
char desc[BUF_SIZE];
|
1350 |
int64_t total_size = 0, filesize;
|
1351 |
const char *backing_file = NULL; |
1352 |
const char *fmt = NULL; |
1353 |
int flags = 0; |
1354 |
int ret = 0; |
1355 |
bool flat, split, compress;
|
1356 |
char ext_desc_lines[BUF_SIZE] = ""; |
1357 |
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
|
1358 |
const int64_t split_size = 0x80000000; /* VMDK has constant split size */ |
1359 |
const char *desc_extent_line; |
1360 |
char parent_desc_line[BUF_SIZE] = ""; |
1361 |
uint32_t parent_cid = 0xffffffff;
|
1362 |
const char desc_template[] = |
1363 |
"# Disk DescriptorFile\n"
|
1364 |
"version=1\n"
|
1365 |
"CID=%x\n"
|
1366 |
"parentCID=%x\n"
|
1367 |
"createType=\"%s\"\n"
|
1368 |
"%s"
|
1369 |
"\n"
|
1370 |
"# Extent description\n"
|
1371 |
"%s"
|
1372 |
"\n"
|
1373 |
"# The Disk Data Base\n"
|
1374 |
"#DDB\n"
|
1375 |
"\n"
|
1376 |
"ddb.virtualHWVersion = \"%d\"\n"
|
1377 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
1378 |
"ddb.geometry.heads = \"16\"\n"
|
1379 |
"ddb.geometry.sectors = \"63\"\n"
|
1380 |
"ddb.adapterType = \"ide\"\n";
|
1381 |
|
1382 |
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
|
1383 |
return -EINVAL;
|
1384 |
} |
1385 |
/* Read out options */
|
1386 |
while (options && options->name) {
|
1387 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1388 |
total_size = options->value.n; |
1389 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1390 |
backing_file = options->value.s; |
1391 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
1392 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
|
1393 |
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { |
1394 |
fmt = options->value.s; |
1395 |
} |
1396 |
options++; |
1397 |
} |
1398 |
if (!fmt) {
|
1399 |
/* Default format to monolithicSparse */
|
1400 |
fmt = "monolithicSparse";
|
1401 |
} else if (strcmp(fmt, "monolithicFlat") && |
1402 |
strcmp(fmt, "monolithicSparse") &&
|
1403 |
strcmp(fmt, "twoGbMaxExtentSparse") &&
|
1404 |
strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1405 |
strcmp(fmt, "streamOptimized")) {
|
1406 |
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
|
1407 |
return -EINVAL;
|
1408 |
} |
1409 |
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
|
1410 |
strcmp(fmt, "twoGbMaxExtentSparse"));
|
1411 |
flat = !(strcmp(fmt, "monolithicFlat") &&
|
1412 |
strcmp(fmt, "twoGbMaxExtentFlat"));
|
1413 |
compress = !strcmp(fmt, "streamOptimized");
|
1414 |
if (flat) {
|
1415 |
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
1416 |
} else {
|
1417 |
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
1418 |
} |
1419 |
if (flat && backing_file) {
|
1420 |
/* not supporting backing file for flat image */
|
1421 |
return -ENOTSUP;
|
1422 |
} |
1423 |
if (backing_file) {
|
1424 |
char parent_filename[PATH_MAX];
|
1425 |
BlockDriverState *bs = bdrv_new("");
|
1426 |
ret = bdrv_open(bs, backing_file, 0, NULL); |
1427 |
if (ret != 0) { |
1428 |
bdrv_delete(bs); |
1429 |
return ret;
|
1430 |
} |
1431 |
if (strcmp(bs->drv->format_name, "vmdk")) { |
1432 |
bdrv_delete(bs); |
1433 |
return -EINVAL;
|
1434 |
} |
1435 |
parent_cid = vmdk_read_cid(bs, 0);
|
1436 |
bdrv_delete(bs); |
1437 |
relative_path(parent_filename, sizeof(parent_filename),
|
1438 |
filename, backing_file); |
1439 |
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
1440 |
"parentFileNameHint=\"%s\"", parent_filename);
|
1441 |
} |
1442 |
|
1443 |
/* Create extents */
|
1444 |
filesize = total_size; |
1445 |
while (filesize > 0) { |
1446 |
char desc_line[BUF_SIZE];
|
1447 |
char ext_filename[PATH_MAX];
|
1448 |
char desc_filename[PATH_MAX];
|
1449 |
int64_t size = filesize; |
1450 |
|
1451 |
if (split && size > split_size) {
|
1452 |
size = split_size; |
1453 |
} |
1454 |
if (split) {
|
1455 |
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", |
1456 |
prefix, flat ? 'f' : 's', ++idx, postfix); |
1457 |
} else if (flat) { |
1458 |
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", |
1459 |
prefix, postfix); |
1460 |
} else {
|
1461 |
snprintf(desc_filename, sizeof(desc_filename), "%s%s", |
1462 |
prefix, postfix); |
1463 |
} |
1464 |
snprintf(ext_filename, sizeof(ext_filename), "%s%s", |
1465 |
path, desc_filename); |
1466 |
|
1467 |
if (vmdk_create_extent(ext_filename, size, flat, compress)) {
|
1468 |
return -EINVAL;
|
1469 |
} |
1470 |
filesize -= size; |
1471 |
|
1472 |
/* Format description line */
|
1473 |
snprintf(desc_line, sizeof(desc_line),
|
1474 |
desc_extent_line, size / 512, desc_filename);
|
1475 |
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
1476 |
} |
1477 |
/* generate descriptor file */
|
1478 |
snprintf(desc, sizeof(desc), desc_template,
|
1479 |
(unsigned int)time(NULL), |
1480 |
parent_cid, |
1481 |
fmt, |
1482 |
parent_desc_line, |
1483 |
ext_desc_lines, |
1484 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1485 |
total_size / (int64_t)(63 * 16 * 512)); |
1486 |
if (split || flat) {
|
1487 |
fd = open( |
1488 |
filename, |
1489 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
1490 |
0644);
|
1491 |
} else {
|
1492 |
fd = open( |
1493 |
filename, |
1494 |
O_WRONLY | O_BINARY | O_LARGEFILE, |
1495 |
0644);
|
1496 |
} |
1497 |
if (fd < 0) { |
1498 |
return -errno;
|
1499 |
} |
1500 |
/* the descriptor offset = 0x200 */
|
1501 |
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { |
1502 |
ret = -errno; |
1503 |
goto exit;
|
1504 |
} |
1505 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1506 |
if (ret != strlen(desc)) {
|
1507 |
ret = -errno; |
1508 |
goto exit;
|
1509 |
} |
1510 |
ret = 0;
|
1511 |
exit:
|
1512 |
close(fd); |
1513 |
return ret;
|
1514 |
} |
1515 |
|
1516 |
static void vmdk_close(BlockDriverState *bs) |
1517 |
{ |
1518 |
BDRVVmdkState *s = bs->opaque; |
1519 |
|
1520 |
vmdk_free_extents(bs); |
1521 |
|
1522 |
migrate_del_blocker(s->migration_blocker); |
1523 |
error_free(s->migration_blocker); |
1524 |
} |
1525 |
|
1526 |
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) |
1527 |
{ |
1528 |
int i, ret, err;
|
1529 |
BDRVVmdkState *s = bs->opaque; |
1530 |
|
1531 |
ret = bdrv_co_flush(bs->file); |
1532 |
for (i = 0; i < s->num_extents; i++) { |
1533 |
err = bdrv_co_flush(s->extents[i].file); |
1534 |
if (err < 0) { |
1535 |
ret = err; |
1536 |
} |
1537 |
} |
1538 |
return ret;
|
1539 |
} |
1540 |
|
1541 |
static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
|
1542 |
{ |
1543 |
int i;
|
1544 |
int64_t ret = 0;
|
1545 |
int64_t r; |
1546 |
BDRVVmdkState *s = bs->opaque; |
1547 |
|
1548 |
ret = bdrv_get_allocated_file_size(bs->file); |
1549 |
if (ret < 0) { |
1550 |
return ret;
|
1551 |
} |
1552 |
for (i = 0; i < s->num_extents; i++) { |
1553 |
if (s->extents[i].file == bs->file) {
|
1554 |
continue;
|
1555 |
} |
1556 |
r = bdrv_get_allocated_file_size(s->extents[i].file); |
1557 |
if (r < 0) { |
1558 |
return r;
|
1559 |
} |
1560 |
ret += r; |
1561 |
} |
1562 |
return ret;
|
1563 |
} |
1564 |
|
1565 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1566 |
{ |
1567 |
.name = BLOCK_OPT_SIZE, |
1568 |
.type = OPT_SIZE, |
1569 |
.help = "Virtual disk size"
|
1570 |
}, |
1571 |
{ |
1572 |
.name = BLOCK_OPT_BACKING_FILE, |
1573 |
.type = OPT_STRING, |
1574 |
.help = "File name of a base image"
|
1575 |
}, |
1576 |
{ |
1577 |
.name = BLOCK_OPT_COMPAT6, |
1578 |
.type = OPT_FLAG, |
1579 |
.help = "VMDK version 6 image"
|
1580 |
}, |
1581 |
{ |
1582 |
.name = BLOCK_OPT_SUBFMT, |
1583 |
.type = OPT_STRING, |
1584 |
.help = |
1585 |
"VMDK flat extent format, can be one of "
|
1586 |
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
|
1587 |
}, |
1588 |
{ NULL }
|
1589 |
}; |
1590 |
|
1591 |
static BlockDriver bdrv_vmdk = {
|
1592 |
.format_name = "vmdk",
|
1593 |
.instance_size = sizeof(BDRVVmdkState),
|
1594 |
.bdrv_probe = vmdk_probe, |
1595 |
.bdrv_open = vmdk_open, |
1596 |
.bdrv_read = vmdk_co_read, |
1597 |
.bdrv_write = vmdk_co_write, |
1598 |
.bdrv_close = vmdk_close, |
1599 |
.bdrv_create = vmdk_create, |
1600 |
.bdrv_co_flush_to_disk = vmdk_co_flush, |
1601 |
.bdrv_co_is_allocated = vmdk_co_is_allocated, |
1602 |
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, |
1603 |
|
1604 |
.create_options = vmdk_create_options, |
1605 |
}; |
1606 |
|
1607 |
static void bdrv_vmdk_init(void) |
1608 |
{ |
1609 |
bdrv_register(&bdrv_vmdk); |
1610 |
} |
1611 |
|
1612 |
block_init(bdrv_vmdk_init); |