root / block / vmdk.c @ 34b5d2c6
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/*
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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/block_int.h" |
| 28 |
#include "qemu/module.h" |
| 29 |
#include "migration/migration.h" |
| 30 |
#include <zlib.h> |
| 31 |
|
| 32 |
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') |
| 33 |
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') |
| 34 |
#define VMDK4_COMPRESSION_DEFLATE 1 |
| 35 |
#define VMDK4_FLAG_NL_DETECT (1 << 0) |
| 36 |
#define VMDK4_FLAG_RGD (1 << 1) |
| 37 |
/* Zeroed-grain enable bit */
|
| 38 |
#define VMDK4_FLAG_ZERO_GRAIN (1 << 2) |
| 39 |
#define VMDK4_FLAG_COMPRESS (1 << 16) |
| 40 |
#define VMDK4_FLAG_MARKER (1 << 17) |
| 41 |
#define VMDK4_GD_AT_END 0xffffffffffffffffULL |
| 42 |
|
| 43 |
#define VMDK_GTE_ZEROED 0x1 |
| 44 |
|
| 45 |
/* VMDK internal error codes */
|
| 46 |
#define VMDK_OK 0 |
| 47 |
#define VMDK_ERROR (-1) |
| 48 |
/* Cluster not allocated */
|
| 49 |
#define VMDK_UNALLOC (-2) |
| 50 |
#define VMDK_ZEROED (-3) |
| 51 |
|
| 52 |
#define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain" |
| 53 |
|
| 54 |
typedef struct { |
| 55 |
uint32_t version; |
| 56 |
uint32_t flags; |
| 57 |
uint32_t disk_sectors; |
| 58 |
uint32_t granularity; |
| 59 |
uint32_t l1dir_offset; |
| 60 |
uint32_t l1dir_size; |
| 61 |
uint32_t file_sectors; |
| 62 |
uint32_t cylinders; |
| 63 |
uint32_t heads; |
| 64 |
uint32_t sectors_per_track; |
| 65 |
} QEMU_PACKED VMDK3Header; |
| 66 |
|
| 67 |
typedef struct { |
| 68 |
uint32_t version; |
| 69 |
uint32_t flags; |
| 70 |
uint64_t capacity; |
| 71 |
uint64_t granularity; |
| 72 |
uint64_t desc_offset; |
| 73 |
uint64_t desc_size; |
| 74 |
/* Number of GrainTableEntries per GrainTable */
|
| 75 |
uint32_t num_gtes_per_gt; |
| 76 |
uint64_t rgd_offset; |
| 77 |
uint64_t gd_offset; |
| 78 |
uint64_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; |
| 83 |
|
| 84 |
#define L2_CACHE_SIZE 16 |
| 85 |
|
| 86 |
typedef struct VmdkExtent { |
| 87 |
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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bool has_zero_grain;
|
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int version;
|
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int64_t sectors; |
| 94 |
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; |
| 101 |
uint32_t l1_entry_sectors; |
| 102 |
|
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unsigned int l2_size; |
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uint32_t *l2_cache; |
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uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
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uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
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|
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unsigned int cluster_sectors; |
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} VmdkExtent; |
| 110 |
|
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typedef struct BDRVVmdkState { |
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CoMutex lock; |
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uint64_t 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; |
| 120 |
} BDRVVmdkState; |
| 121 |
|
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typedef struct VmdkMetaData { |
| 123 |
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; |
| 127 |
int valid;
|
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uint32_t *l2_cache_entry; |
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} VmdkMetaData; |
| 130 |
|
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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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} QEMU_PACKED VmdkGrainMarker; |
| 136 |
|
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enum {
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MARKER_END_OF_STREAM = 0,
|
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MARKER_GRAIN_TABLE = 1,
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MARKER_GRAIN_DIRECTORY = 2,
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MARKER_FOOTER = 3,
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}; |
| 143 |
|
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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; |
| 158 |
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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} |
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p++; |
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continue;
|
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} |
| 167 |
if (*p == ' ') { |
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while (p < end && *p == ' ') { |
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p++; |
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} |
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/* skip '\r' if windows line endings used. */
|
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if (p < end && *p == '\r') { |
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p++; |
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} |
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/* 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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} |
| 182 |
if (end - p >= strlen("version=X\n")) { |
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if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || |
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strncmp("version=2\n", p, strlen("version=2\n")) == 0) { |
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return 100; |
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} |
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} |
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if (end - p >= strlen("version=X\r\n")) { |
| 189 |
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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} |
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|
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#define CHECK_CID 1 |
| 201 |
|
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#define SECTOR_SIZE 512 |
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#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ |
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#define BUF_SIZE 4096 |
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#define HEADER_SIZE 512 /* first sector of 512 bytes */ |
| 206 |
|
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static void vmdk_free_extents(BlockDriverState *bs) |
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{
|
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int i;
|
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BDRVVmdkState *s = bs->opaque; |
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VmdkExtent *e; |
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|
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for (i = 0; i < s->num_extents; i++) { |
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e = &s->extents[i]; |
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g_free(e->l1_table); |
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g_free(e->l2_cache); |
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g_free(e->l1_backup_table); |
| 218 |
if (e->file != bs->file) {
|
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bdrv_unref(e->file); |
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} |
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} |
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g_free(s->extents); |
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} |
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|
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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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|
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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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} |
| 235 |
|
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
| 237 |
{
|
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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; |
| 243 |
int ret;
|
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|
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ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
| 246 |
if (ret < 0) { |
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return 0; |
| 248 |
} |
| 249 |
|
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if (parent) {
|
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cid_str = "parentCID";
|
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cid_str_size = sizeof("parentCID"); |
| 253 |
} else {
|
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cid_str = "CID";
|
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cid_str_size = sizeof("CID"); |
| 256 |
} |
| 257 |
|
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desc[DESC_SIZE - 1] = '\0'; |
| 259 |
p_name = strstr(desc, cid_str); |
| 260 |
if (p_name != NULL) { |
| 261 |
p_name += cid_str_size; |
| 262 |
sscanf(p_name, "%x", &cid);
|
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} |
| 264 |
|
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return cid;
|
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} |
| 267 |
|
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
| 269 |
{
|
| 270 |
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; |
| 273 |
int ret;
|
| 274 |
|
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ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
| 276 |
if (ret < 0) { |
| 277 |
return ret;
|
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} |
| 279 |
|
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desc[DESC_SIZE - 1] = '\0'; |
| 281 |
tmp_str = strstr(desc, "parentCID");
|
| 282 |
if (tmp_str == NULL) { |
| 283 |
return -EINVAL;
|
| 284 |
} |
| 285 |
|
| 286 |
pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
|
| 287 |
p_name = strstr(desc, "CID");
|
| 288 |
if (p_name != NULL) { |
| 289 |
p_name += sizeof("CID"); |
| 290 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
| 291 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
| 292 |
} |
| 293 |
|
| 294 |
ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); |
| 295 |
if (ret < 0) { |
| 296 |
return ret;
|
| 297 |
} |
| 298 |
|
| 299 |
return 0; |
| 300 |
} |
| 301 |
|
| 302 |
static int vmdk_is_cid_valid(BlockDriverState *bs) |
| 303 |
{
|
| 304 |
#ifdef CHECK_CID
|
| 305 |
BDRVVmdkState *s = bs->opaque; |
| 306 |
BlockDriverState *p_bs = bs->backing_hd; |
| 307 |
uint32_t cur_pcid; |
| 308 |
|
| 309 |
if (p_bs) {
|
| 310 |
cur_pcid = vmdk_read_cid(p_bs, 0);
|
| 311 |
if (s->parent_cid != cur_pcid) {
|
| 312 |
/* CID not valid */
|
| 313 |
return 0; |
| 314 |
} |
| 315 |
} |
| 316 |
#endif
|
| 317 |
/* CID valid */
|
| 318 |
return 1; |
| 319 |
} |
| 320 |
|
| 321 |
/* Queue extents, if any, for reopen() */
|
| 322 |
static int vmdk_reopen_prepare(BDRVReopenState *state, |
| 323 |
BlockReopenQueue *queue, Error **errp) |
| 324 |
{
|
| 325 |
BDRVVmdkState *s; |
| 326 |
int ret = -1; |
| 327 |
int i;
|
| 328 |
VmdkExtent *e; |
| 329 |
|
| 330 |
assert(state != NULL);
|
| 331 |
assert(state->bs != NULL);
|
| 332 |
|
| 333 |
if (queue == NULL) { |
| 334 |
error_set(errp, ERROR_CLASS_GENERIC_ERROR, |
| 335 |
"No reopen queue for VMDK extents");
|
| 336 |
goto exit;
|
| 337 |
} |
| 338 |
|
| 339 |
s = state->bs->opaque; |
| 340 |
|
| 341 |
assert(s != NULL);
|
| 342 |
|
| 343 |
for (i = 0; i < s->num_extents; i++) { |
| 344 |
e = &s->extents[i]; |
| 345 |
if (e->file != state->bs->file) {
|
| 346 |
bdrv_reopen_queue(queue, e->file, state->flags); |
| 347 |
} |
| 348 |
} |
| 349 |
ret = 0;
|
| 350 |
|
| 351 |
exit:
|
| 352 |
return ret;
|
| 353 |
} |
| 354 |
|
| 355 |
static int vmdk_parent_open(BlockDriverState *bs) |
| 356 |
{
|
| 357 |
char *p_name;
|
| 358 |
char desc[DESC_SIZE + 1]; |
| 359 |
BDRVVmdkState *s = bs->opaque; |
| 360 |
int ret;
|
| 361 |
|
| 362 |
desc[DESC_SIZE] = '\0';
|
| 363 |
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); |
| 364 |
if (ret < 0) { |
| 365 |
return ret;
|
| 366 |
} |
| 367 |
|
| 368 |
p_name = strstr(desc, "parentFileNameHint");
|
| 369 |
if (p_name != NULL) { |
| 370 |
char *end_name;
|
| 371 |
|
| 372 |
p_name += sizeof("parentFileNameHint") + 1; |
| 373 |
end_name = strchr(p_name, '\"');
|
| 374 |
if (end_name == NULL) { |
| 375 |
return -EINVAL;
|
| 376 |
} |
| 377 |
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { |
| 378 |
return -EINVAL;
|
| 379 |
} |
| 380 |
|
| 381 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
| 382 |
} |
| 383 |
|
| 384 |
return 0; |
| 385 |
} |
| 386 |
|
| 387 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
| 388 |
* address. return NULL if allocation failed. */
|
| 389 |
static int vmdk_add_extent(BlockDriverState *bs, |
| 390 |
BlockDriverState *file, bool flat, int64_t sectors,
|
| 391 |
int64_t l1_offset, int64_t l1_backup_offset, |
| 392 |
uint32_t l1_size, |
| 393 |
int l2_size, uint64_t cluster_sectors,
|
| 394 |
VmdkExtent **new_extent) |
| 395 |
{
|
| 396 |
VmdkExtent *extent; |
| 397 |
BDRVVmdkState *s = bs->opaque; |
| 398 |
|
| 399 |
if (cluster_sectors > 0x200000) { |
| 400 |
/* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
|
| 401 |
error_report("invalid granularity, image may be corrupt");
|
| 402 |
return -EINVAL;
|
| 403 |
} |
| 404 |
if (l1_size > 512 * 1024 * 1024) { |
| 405 |
/* Although with big capacity and small l1_entry_sectors, we can get a
|
| 406 |
* big l1_size, we don't want unbounded value to allocate the table.
|
| 407 |
* Limit it to 512M, which is 16PB for default cluster and L2 table
|
| 408 |
* size */
|
| 409 |
error_report("L1 size too big");
|
| 410 |
return -EFBIG;
|
| 411 |
} |
| 412 |
|
| 413 |
s->extents = g_realloc(s->extents, |
| 414 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
| 415 |
extent = &s->extents[s->num_extents]; |
| 416 |
s->num_extents++; |
| 417 |
|
| 418 |
memset(extent, 0, sizeof(VmdkExtent)); |
| 419 |
extent->file = file; |
| 420 |
extent->flat = flat; |
| 421 |
extent->sectors = sectors; |
| 422 |
extent->l1_table_offset = l1_offset; |
| 423 |
extent->l1_backup_table_offset = l1_backup_offset; |
| 424 |
extent->l1_size = l1_size; |
| 425 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
| 426 |
extent->l2_size = l2_size; |
| 427 |
extent->cluster_sectors = cluster_sectors; |
| 428 |
|
| 429 |
if (s->num_extents > 1) { |
| 430 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
| 431 |
} else {
|
| 432 |
extent->end_sector = extent->sectors; |
| 433 |
} |
| 434 |
bs->total_sectors = extent->end_sector; |
| 435 |
if (new_extent) {
|
| 436 |
*new_extent = extent; |
| 437 |
} |
| 438 |
return 0; |
| 439 |
} |
| 440 |
|
| 441 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
| 442 |
{
|
| 443 |
int ret;
|
| 444 |
int l1_size, i;
|
| 445 |
|
| 446 |
/* read the L1 table */
|
| 447 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
| 448 |
extent->l1_table = g_malloc(l1_size); |
| 449 |
ret = bdrv_pread(extent->file, |
| 450 |
extent->l1_table_offset, |
| 451 |
extent->l1_table, |
| 452 |
l1_size); |
| 453 |
if (ret < 0) { |
| 454 |
goto fail_l1;
|
| 455 |
} |
| 456 |
for (i = 0; i < extent->l1_size; i++) { |
| 457 |
le32_to_cpus(&extent->l1_table[i]); |
| 458 |
} |
| 459 |
|
| 460 |
if (extent->l1_backup_table_offset) {
|
| 461 |
extent->l1_backup_table = g_malloc(l1_size); |
| 462 |
ret = bdrv_pread(extent->file, |
| 463 |
extent->l1_backup_table_offset, |
| 464 |
extent->l1_backup_table, |
| 465 |
l1_size); |
| 466 |
if (ret < 0) { |
| 467 |
goto fail_l1b;
|
| 468 |
} |
| 469 |
for (i = 0; i < extent->l1_size; i++) { |
| 470 |
le32_to_cpus(&extent->l1_backup_table[i]); |
| 471 |
} |
| 472 |
} |
| 473 |
|
| 474 |
extent->l2_cache = |
| 475 |
g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
| 476 |
return 0; |
| 477 |
fail_l1b:
|
| 478 |
g_free(extent->l1_backup_table); |
| 479 |
fail_l1:
|
| 480 |
g_free(extent->l1_table); |
| 481 |
return ret;
|
| 482 |
} |
| 483 |
|
| 484 |
static int vmdk_open_vmfs_sparse(BlockDriverState *bs, |
| 485 |
BlockDriverState *file, |
| 486 |
int flags)
|
| 487 |
{
|
| 488 |
int ret;
|
| 489 |
uint32_t magic; |
| 490 |
VMDK3Header header; |
| 491 |
VmdkExtent *extent; |
| 492 |
|
| 493 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
| 494 |
if (ret < 0) { |
| 495 |
return ret;
|
| 496 |
} |
| 497 |
ret = vmdk_add_extent(bs, file, false,
|
| 498 |
le32_to_cpu(header.disk_sectors), |
| 499 |
le32_to_cpu(header.l1dir_offset) << 9,
|
| 500 |
0,
|
| 501 |
le32_to_cpu(header.l1dir_size), |
| 502 |
4096,
|
| 503 |
le32_to_cpu(header.granularity), |
| 504 |
&extent); |
| 505 |
if (ret < 0) { |
| 506 |
return ret;
|
| 507 |
} |
| 508 |
ret = vmdk_init_tables(bs, extent); |
| 509 |
if (ret) {
|
| 510 |
/* free extent allocated by vmdk_add_extent */
|
| 511 |
vmdk_free_last_extent(bs); |
| 512 |
} |
| 513 |
return ret;
|
| 514 |
} |
| 515 |
|
| 516 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
| 517 |
uint64_t desc_offset); |
| 518 |
|
| 519 |
static int vmdk_open_vmdk4(BlockDriverState *bs, |
| 520 |
BlockDriverState *file, |
| 521 |
int flags)
|
| 522 |
{
|
| 523 |
int ret;
|
| 524 |
uint32_t magic; |
| 525 |
uint32_t l1_size, l1_entry_sectors; |
| 526 |
VMDK4Header header; |
| 527 |
VmdkExtent *extent; |
| 528 |
int64_t l1_backup_offset = 0;
|
| 529 |
|
| 530 |
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); |
| 531 |
if (ret < 0) { |
| 532 |
return ret;
|
| 533 |
} |
| 534 |
if (header.capacity == 0) { |
| 535 |
uint64_t desc_offset = le64_to_cpu(header.desc_offset); |
| 536 |
if (desc_offset) {
|
| 537 |
return vmdk_open_desc_file(bs, flags, desc_offset << 9); |
| 538 |
} |
| 539 |
} |
| 540 |
|
| 541 |
if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
|
| 542 |
/*
|
| 543 |
* The footer takes precedence over the header, so read it in. The
|
| 544 |
* footer starts at offset -1024 from the end: One sector for the
|
| 545 |
* footer, and another one for the end-of-stream marker.
|
| 546 |
*/
|
| 547 |
struct {
|
| 548 |
struct {
|
| 549 |
uint64_t val; |
| 550 |
uint32_t size; |
| 551 |
uint32_t type; |
| 552 |
uint8_t pad[512 - 16]; |
| 553 |
} QEMU_PACKED footer_marker; |
| 554 |
|
| 555 |
uint32_t magic; |
| 556 |
VMDK4Header header; |
| 557 |
uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; |
| 558 |
|
| 559 |
struct {
|
| 560 |
uint64_t val; |
| 561 |
uint32_t size; |
| 562 |
uint32_t type; |
| 563 |
uint8_t pad[512 - 16]; |
| 564 |
} QEMU_PACKED eos_marker; |
| 565 |
} QEMU_PACKED footer; |
| 566 |
|
| 567 |
ret = bdrv_pread(file, |
| 568 |
bs->file->total_sectors * 512 - 1536, |
| 569 |
&footer, sizeof(footer));
|
| 570 |
if (ret < 0) { |
| 571 |
return ret;
|
| 572 |
} |
| 573 |
|
| 574 |
/* Some sanity checks for the footer */
|
| 575 |
if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
|
| 576 |
le32_to_cpu(footer.footer_marker.size) != 0 ||
|
| 577 |
le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || |
| 578 |
le64_to_cpu(footer.eos_marker.val) != 0 ||
|
| 579 |
le32_to_cpu(footer.eos_marker.size) != 0 ||
|
| 580 |
le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) |
| 581 |
{
|
| 582 |
return -EINVAL;
|
| 583 |
} |
| 584 |
|
| 585 |
header = footer.header; |
| 586 |
} |
| 587 |
|
| 588 |
if (le32_to_cpu(header.version) >= 3) { |
| 589 |
char buf[64]; |
| 590 |
snprintf(buf, sizeof(buf), "VMDK version %d", |
| 591 |
le32_to_cpu(header.version)); |
| 592 |
qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
| 593 |
bs->device_name, "vmdk", buf);
|
| 594 |
return -ENOTSUP;
|
| 595 |
} |
| 596 |
|
| 597 |
if (le32_to_cpu(header.num_gtes_per_gt) > 512) { |
| 598 |
error_report("L2 table size too big");
|
| 599 |
return -EINVAL;
|
| 600 |
} |
| 601 |
|
| 602 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) |
| 603 |
* le64_to_cpu(header.granularity); |
| 604 |
if (l1_entry_sectors == 0) { |
| 605 |
return -EINVAL;
|
| 606 |
} |
| 607 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
| 608 |
/ l1_entry_sectors; |
| 609 |
if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
|
| 610 |
l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
|
| 611 |
} |
| 612 |
ret = vmdk_add_extent(bs, file, false,
|
| 613 |
le64_to_cpu(header.capacity), |
| 614 |
le64_to_cpu(header.gd_offset) << 9,
|
| 615 |
l1_backup_offset, |
| 616 |
l1_size, |
| 617 |
le32_to_cpu(header.num_gtes_per_gt), |
| 618 |
le64_to_cpu(header.granularity), |
| 619 |
&extent); |
| 620 |
if (ret < 0) { |
| 621 |
return ret;
|
| 622 |
} |
| 623 |
extent->compressed = |
| 624 |
le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; |
| 625 |
extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; |
| 626 |
extent->version = le32_to_cpu(header.version); |
| 627 |
extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; |
| 628 |
ret = vmdk_init_tables(bs, extent); |
| 629 |
if (ret) {
|
| 630 |
/* free extent allocated by vmdk_add_extent */
|
| 631 |
vmdk_free_last_extent(bs); |
| 632 |
} |
| 633 |
return ret;
|
| 634 |
} |
| 635 |
|
| 636 |
/* find an option value out of descriptor file */
|
| 637 |
static int vmdk_parse_description(const char *desc, const char *opt_name, |
| 638 |
char *buf, int buf_size) |
| 639 |
{
|
| 640 |
char *opt_pos, *opt_end;
|
| 641 |
const char *end = desc + strlen(desc); |
| 642 |
|
| 643 |
opt_pos = strstr(desc, opt_name); |
| 644 |
if (!opt_pos) {
|
| 645 |
return VMDK_ERROR;
|
| 646 |
} |
| 647 |
/* Skip "=\"" following opt_name */
|
| 648 |
opt_pos += strlen(opt_name) + 2;
|
| 649 |
if (opt_pos >= end) {
|
| 650 |
return VMDK_ERROR;
|
| 651 |
} |
| 652 |
opt_end = opt_pos; |
| 653 |
while (opt_end < end && *opt_end != '"') { |
| 654 |
opt_end++; |
| 655 |
} |
| 656 |
if (opt_end == end || buf_size < opt_end - opt_pos + 1) { |
| 657 |
return VMDK_ERROR;
|
| 658 |
} |
| 659 |
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
| 660 |
return VMDK_OK;
|
| 661 |
} |
| 662 |
|
| 663 |
/* Open an extent file and append to bs array */
|
| 664 |
static int vmdk_open_sparse(BlockDriverState *bs, |
| 665 |
BlockDriverState *file, |
| 666 |
int flags)
|
| 667 |
{
|
| 668 |
uint32_t magic; |
| 669 |
|
| 670 |
if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
| 671 |
return -EIO;
|
| 672 |
} |
| 673 |
|
| 674 |
magic = be32_to_cpu(magic); |
| 675 |
switch (magic) {
|
| 676 |
case VMDK3_MAGIC:
|
| 677 |
return vmdk_open_vmfs_sparse(bs, file, flags);
|
| 678 |
break;
|
| 679 |
case VMDK4_MAGIC:
|
| 680 |
return vmdk_open_vmdk4(bs, file, flags);
|
| 681 |
break;
|
| 682 |
default:
|
| 683 |
return -EMEDIUMTYPE;
|
| 684 |
break;
|
| 685 |
} |
| 686 |
} |
| 687 |
|
| 688 |
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, |
| 689 |
const char *desc_file_path) |
| 690 |
{
|
| 691 |
int ret;
|
| 692 |
char access[11]; |
| 693 |
char type[11]; |
| 694 |
char fname[512]; |
| 695 |
const char *p = desc; |
| 696 |
int64_t sectors = 0;
|
| 697 |
int64_t flat_offset; |
| 698 |
char extent_path[PATH_MAX];
|
| 699 |
BlockDriverState *extent_file; |
| 700 |
Error *local_err = NULL;
|
| 701 |
|
| 702 |
while (*p) {
|
| 703 |
/* parse extent line:
|
| 704 |
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
| 705 |
* or
|
| 706 |
* RW [size in sectors] SPARSE "file-name.vmdk"
|
| 707 |
*/
|
| 708 |
flat_offset = -1;
|
| 709 |
ret = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, |
| 710 |
access, §ors, type, fname, &flat_offset); |
| 711 |
if (ret < 4 || strcmp(access, "RW")) { |
| 712 |
goto next_line;
|
| 713 |
} else if (!strcmp(type, "FLAT")) { |
| 714 |
if (ret != 5 || flat_offset < 0) { |
| 715 |
return -EINVAL;
|
| 716 |
} |
| 717 |
} else if (ret != 4) { |
| 718 |
return -EINVAL;
|
| 719 |
} |
| 720 |
|
| 721 |
if (sectors <= 0 || |
| 722 |
(strcmp(type, "FLAT") && strcmp(type, "SPARSE") && |
| 723 |
strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || |
| 724 |
(strcmp(access, "RW"))) {
|
| 725 |
goto next_line;
|
| 726 |
} |
| 727 |
|
| 728 |
path_combine(extent_path, sizeof(extent_path),
|
| 729 |
desc_file_path, fname); |
| 730 |
ret = bdrv_file_open(&extent_file, extent_path, NULL, bs->open_flags,
|
| 731 |
&local_err); |
| 732 |
if (ret) {
|
| 733 |
qerror_report_err(local_err); |
| 734 |
error_free(local_err); |
| 735 |
return ret;
|
| 736 |
} |
| 737 |
|
| 738 |
/* save to extents array */
|
| 739 |
if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { |
| 740 |
/* FLAT extent */
|
| 741 |
VmdkExtent *extent; |
| 742 |
|
| 743 |
ret = vmdk_add_extent(bs, extent_file, true, sectors,
|
| 744 |
0, 0, 0, 0, sectors, &extent); |
| 745 |
if (ret < 0) { |
| 746 |
return ret;
|
| 747 |
} |
| 748 |
extent->flat_start_offset = flat_offset << 9;
|
| 749 |
} else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { |
| 750 |
/* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
|
| 751 |
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags); |
| 752 |
if (ret) {
|
| 753 |
bdrv_unref(extent_file); |
| 754 |
return ret;
|
| 755 |
} |
| 756 |
} else {
|
| 757 |
fprintf(stderr, |
| 758 |
"VMDK: Not supported extent type \"%s\""".\n", type); |
| 759 |
return -ENOTSUP;
|
| 760 |
} |
| 761 |
next_line:
|
| 762 |
/* move to next line */
|
| 763 |
while (*p && *p != '\n') { |
| 764 |
p++; |
| 765 |
} |
| 766 |
p++; |
| 767 |
} |
| 768 |
return 0; |
| 769 |
} |
| 770 |
|
| 771 |
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, |
| 772 |
uint64_t desc_offset) |
| 773 |
{
|
| 774 |
int ret;
|
| 775 |
char *buf = NULL; |
| 776 |
char ct[128]; |
| 777 |
BDRVVmdkState *s = bs->opaque; |
| 778 |
int64_t size; |
| 779 |
|
| 780 |
size = bdrv_getlength(bs->file); |
| 781 |
if (size < 0) { |
| 782 |
return -EINVAL;
|
| 783 |
} |
| 784 |
|
| 785 |
size = MIN(size, 1 << 20); /* avoid unbounded allocation */ |
| 786 |
buf = g_malloc0(size + 1);
|
| 787 |
|
| 788 |
ret = bdrv_pread(bs->file, desc_offset, buf, size); |
| 789 |
if (ret < 0) { |
| 790 |
goto exit;
|
| 791 |
} |
| 792 |
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { |
| 793 |
ret = -EMEDIUMTYPE; |
| 794 |
goto exit;
|
| 795 |
} |
| 796 |
if (strcmp(ct, "monolithicFlat") && |
| 797 |
strcmp(ct, "vmfs") &&
|
| 798 |
strcmp(ct, "vmfsSparse") &&
|
| 799 |
strcmp(ct, "twoGbMaxExtentSparse") &&
|
| 800 |
strcmp(ct, "twoGbMaxExtentFlat")) {
|
| 801 |
fprintf(stderr, |
| 802 |
"VMDK: Not supported image type \"%s\""".\n", ct); |
| 803 |
ret = -ENOTSUP; |
| 804 |
goto exit;
|
| 805 |
} |
| 806 |
s->desc_offset = 0;
|
| 807 |
ret = vmdk_parse_extents(buf, bs, bs->file->filename); |
| 808 |
exit:
|
| 809 |
g_free(buf); |
| 810 |
return ret;
|
| 811 |
} |
| 812 |
|
| 813 |
static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, |
| 814 |
Error **errp) |
| 815 |
{
|
| 816 |
int ret;
|
| 817 |
BDRVVmdkState *s = bs->opaque; |
| 818 |
|
| 819 |
if (vmdk_open_sparse(bs, bs->file, flags) == 0) { |
| 820 |
s->desc_offset = 0x200;
|
| 821 |
} else {
|
| 822 |
ret = vmdk_open_desc_file(bs, flags, 0);
|
| 823 |
if (ret) {
|
| 824 |
goto fail;
|
| 825 |
} |
| 826 |
} |
| 827 |
/* try to open parent images, if exist */
|
| 828 |
ret = vmdk_parent_open(bs); |
| 829 |
if (ret) {
|
| 830 |
goto fail;
|
| 831 |
} |
| 832 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
| 833 |
qemu_co_mutex_init(&s->lock); |
| 834 |
|
| 835 |
/* Disable migration when VMDK images are used */
|
| 836 |
error_set(&s->migration_blocker, |
| 837 |
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
| 838 |
"vmdk", bs->device_name, "live migration"); |
| 839 |
migrate_add_blocker(s->migration_blocker); |
| 840 |
|
| 841 |
return 0; |
| 842 |
|
| 843 |
fail:
|
| 844 |
vmdk_free_extents(bs); |
| 845 |
return ret;
|
| 846 |
} |
| 847 |
|
| 848 |
static int get_whole_cluster(BlockDriverState *bs, |
| 849 |
VmdkExtent *extent, |
| 850 |
uint64_t cluster_offset, |
| 851 |
uint64_t offset, |
| 852 |
bool allocate)
|
| 853 |
{
|
| 854 |
int ret = VMDK_OK;
|
| 855 |
uint8_t *whole_grain = NULL;
|
| 856 |
|
| 857 |
/* we will be here if it's first write on non-exist grain(cluster).
|
| 858 |
* try to read from parent image, if exist */
|
| 859 |
if (bs->backing_hd) {
|
| 860 |
whole_grain = |
| 861 |
qemu_blockalign(bs, extent->cluster_sectors << BDRV_SECTOR_BITS); |
| 862 |
if (!vmdk_is_cid_valid(bs)) {
|
| 863 |
ret = VMDK_ERROR; |
| 864 |
goto exit;
|
| 865 |
} |
| 866 |
|
| 867 |
/* floor offset to cluster */
|
| 868 |
offset -= offset % (extent->cluster_sectors * 512);
|
| 869 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
| 870 |
extent->cluster_sectors); |
| 871 |
if (ret < 0) { |
| 872 |
ret = VMDK_ERROR; |
| 873 |
goto exit;
|
| 874 |
} |
| 875 |
|
| 876 |
/* Write grain only into the active image */
|
| 877 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
| 878 |
extent->cluster_sectors); |
| 879 |
if (ret < 0) { |
| 880 |
ret = VMDK_ERROR; |
| 881 |
goto exit;
|
| 882 |
} |
| 883 |
} |
| 884 |
exit:
|
| 885 |
qemu_vfree(whole_grain); |
| 886 |
return ret;
|
| 887 |
} |
| 888 |
|
| 889 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
| 890 |
{
|
| 891 |
uint32_t offset; |
| 892 |
QEMU_BUILD_BUG_ON(sizeof(offset) != sizeof(m_data->offset)); |
| 893 |
offset = cpu_to_le32(m_data->offset); |
| 894 |
/* update L2 table */
|
| 895 |
if (bdrv_pwrite_sync(
|
| 896 |
extent->file, |
| 897 |
((int64_t)m_data->l2_offset * 512)
|
| 898 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
| 899 |
&offset, sizeof(offset)) < 0) { |
| 900 |
return VMDK_ERROR;
|
| 901 |
} |
| 902 |
/* update backup L2 table */
|
| 903 |
if (extent->l1_backup_table_offset != 0) { |
| 904 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
| 905 |
if (bdrv_pwrite_sync(
|
| 906 |
extent->file, |
| 907 |
((int64_t)m_data->l2_offset * 512)
|
| 908 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
| 909 |
&offset, sizeof(offset)) < 0) { |
| 910 |
return VMDK_ERROR;
|
| 911 |
} |
| 912 |
} |
| 913 |
if (m_data->l2_cache_entry) {
|
| 914 |
*m_data->l2_cache_entry = offset; |
| 915 |
} |
| 916 |
|
| 917 |
return VMDK_OK;
|
| 918 |
} |
| 919 |
|
| 920 |
static int get_cluster_offset(BlockDriverState *bs, |
| 921 |
VmdkExtent *extent, |
| 922 |
VmdkMetaData *m_data, |
| 923 |
uint64_t offset, |
| 924 |
int allocate,
|
| 925 |
uint64_t *cluster_offset) |
| 926 |
{
|
| 927 |
unsigned int l1_index, l2_offset, l2_index; |
| 928 |
int min_index, i, j;
|
| 929 |
uint32_t min_count, *l2_table; |
| 930 |
bool zeroed = false; |
| 931 |
|
| 932 |
if (m_data) {
|
| 933 |
m_data->valid = 0;
|
| 934 |
} |
| 935 |
if (extent->flat) {
|
| 936 |
*cluster_offset = extent->flat_start_offset; |
| 937 |
return VMDK_OK;
|
| 938 |
} |
| 939 |
|
| 940 |
offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; |
| 941 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
| 942 |
if (l1_index >= extent->l1_size) {
|
| 943 |
return VMDK_ERROR;
|
| 944 |
} |
| 945 |
l2_offset = extent->l1_table[l1_index]; |
| 946 |
if (!l2_offset) {
|
| 947 |
return VMDK_UNALLOC;
|
| 948 |
} |
| 949 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
| 950 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
| 951 |
/* increment the hit count */
|
| 952 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
| 953 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
| 954 |
extent->l2_cache_counts[j] >>= 1;
|
| 955 |
} |
| 956 |
} |
| 957 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
| 958 |
goto found;
|
| 959 |
} |
| 960 |
} |
| 961 |
/* not found: load a new entry in the least used one */
|
| 962 |
min_index = 0;
|
| 963 |
min_count = 0xffffffff;
|
| 964 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
| 965 |
if (extent->l2_cache_counts[i] < min_count) {
|
| 966 |
min_count = extent->l2_cache_counts[i]; |
| 967 |
min_index = i; |
| 968 |
} |
| 969 |
} |
| 970 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
| 971 |
if (bdrv_pread(
|
| 972 |
extent->file, |
| 973 |
(int64_t)l2_offset * 512,
|
| 974 |
l2_table, |
| 975 |
extent->l2_size * sizeof(uint32_t)
|
| 976 |
) != extent->l2_size * sizeof(uint32_t)) {
|
| 977 |
return VMDK_ERROR;
|
| 978 |
} |
| 979 |
|
| 980 |
extent->l2_cache_offsets[min_index] = l2_offset; |
| 981 |
extent->l2_cache_counts[min_index] = 1;
|
| 982 |
found:
|
| 983 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
| 984 |
*cluster_offset = le32_to_cpu(l2_table[l2_index]); |
| 985 |
|
| 986 |
if (m_data) {
|
| 987 |
m_data->valid = 1;
|
| 988 |
m_data->l1_index = l1_index; |
| 989 |
m_data->l2_index = l2_index; |
| 990 |
m_data->offset = *cluster_offset; |
| 991 |
m_data->l2_offset = l2_offset; |
| 992 |
m_data->l2_cache_entry = &l2_table[l2_index]; |
| 993 |
} |
| 994 |
if (extent->has_zero_grain && *cluster_offset == VMDK_GTE_ZEROED) {
|
| 995 |
zeroed = true;
|
| 996 |
} |
| 997 |
|
| 998 |
if (!*cluster_offset || zeroed) {
|
| 999 |
if (!allocate) {
|
| 1000 |
return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
|
| 1001 |
} |
| 1002 |
|
| 1003 |
/* Avoid the L2 tables update for the images that have snapshots. */
|
| 1004 |
*cluster_offset = bdrv_getlength(extent->file); |
| 1005 |
if (!extent->compressed) {
|
| 1006 |
bdrv_truncate( |
| 1007 |
extent->file, |
| 1008 |
*cluster_offset + (extent->cluster_sectors << 9)
|
| 1009 |
); |
| 1010 |
} |
| 1011 |
|
| 1012 |
*cluster_offset >>= 9;
|
| 1013 |
l2_table[l2_index] = cpu_to_le32(*cluster_offset); |
| 1014 |
|
| 1015 |
/* First of all we write grain itself, to avoid race condition
|
| 1016 |
* that may to corrupt the image.
|
| 1017 |
* This problem may occur because of insufficient space on host disk
|
| 1018 |
* or inappropriate VM shutdown.
|
| 1019 |
*/
|
| 1020 |
if (get_whole_cluster(
|
| 1021 |
bs, extent, *cluster_offset, offset, allocate) == -1) {
|
| 1022 |
return VMDK_ERROR;
|
| 1023 |
} |
| 1024 |
|
| 1025 |
if (m_data) {
|
| 1026 |
m_data->offset = *cluster_offset; |
| 1027 |
} |
| 1028 |
} |
| 1029 |
*cluster_offset <<= 9;
|
| 1030 |
return VMDK_OK;
|
| 1031 |
} |
| 1032 |
|
| 1033 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
| 1034 |
int64_t sector_num, VmdkExtent *start_hint) |
| 1035 |
{
|
| 1036 |
VmdkExtent *extent = start_hint; |
| 1037 |
|
| 1038 |
if (!extent) {
|
| 1039 |
extent = &s->extents[0];
|
| 1040 |
} |
| 1041 |
while (extent < &s->extents[s->num_extents]) {
|
| 1042 |
if (sector_num < extent->end_sector) {
|
| 1043 |
return extent;
|
| 1044 |
} |
| 1045 |
extent++; |
| 1046 |
} |
| 1047 |
return NULL; |
| 1048 |
} |
| 1049 |
|
| 1050 |
static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
|
| 1051 |
int64_t sector_num, int nb_sectors, int *pnum) |
| 1052 |
{
|
| 1053 |
BDRVVmdkState *s = bs->opaque; |
| 1054 |
int64_t index_in_cluster, n, ret; |
| 1055 |
uint64_t offset; |
| 1056 |
VmdkExtent *extent; |
| 1057 |
|
| 1058 |
extent = find_extent(s, sector_num, NULL);
|
| 1059 |
if (!extent) {
|
| 1060 |
return 0; |
| 1061 |
} |
| 1062 |
qemu_co_mutex_lock(&s->lock); |
| 1063 |
ret = get_cluster_offset(bs, extent, NULL,
|
| 1064 |
sector_num * 512, 0, &offset); |
| 1065 |
qemu_co_mutex_unlock(&s->lock); |
| 1066 |
|
| 1067 |
switch (ret) {
|
| 1068 |
case VMDK_ERROR:
|
| 1069 |
ret = -EIO; |
| 1070 |
break;
|
| 1071 |
case VMDK_UNALLOC:
|
| 1072 |
ret = 0;
|
| 1073 |
break;
|
| 1074 |
case VMDK_ZEROED:
|
| 1075 |
ret = BDRV_BLOCK_ZERO; |
| 1076 |
break;
|
| 1077 |
case VMDK_OK:
|
| 1078 |
ret = BDRV_BLOCK_DATA; |
| 1079 |
if (extent->file == bs->file) {
|
| 1080 |
ret |= BDRV_BLOCK_OFFSET_VALID | offset; |
| 1081 |
} |
| 1082 |
|
| 1083 |
break;
|
| 1084 |
} |
| 1085 |
|
| 1086 |
index_in_cluster = sector_num % extent->cluster_sectors; |
| 1087 |
n = extent->cluster_sectors - index_in_cluster; |
| 1088 |
if (n > nb_sectors) {
|
| 1089 |
n = nb_sectors; |
| 1090 |
} |
| 1091 |
*pnum = n; |
| 1092 |
return ret;
|
| 1093 |
} |
| 1094 |
|
| 1095 |
static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, |
| 1096 |
int64_t offset_in_cluster, const uint8_t *buf,
|
| 1097 |
int nb_sectors, int64_t sector_num)
|
| 1098 |
{
|
| 1099 |
int ret;
|
| 1100 |
VmdkGrainMarker *data = NULL;
|
| 1101 |
uLongf buf_len; |
| 1102 |
const uint8_t *write_buf = buf;
|
| 1103 |
int write_len = nb_sectors * 512; |
| 1104 |
|
| 1105 |
if (extent->compressed) {
|
| 1106 |
if (!extent->has_marker) {
|
| 1107 |
ret = -EINVAL; |
| 1108 |
goto out;
|
| 1109 |
} |
| 1110 |
buf_len = (extent->cluster_sectors << 9) * 2; |
| 1111 |
data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
|
| 1112 |
if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || |
| 1113 |
buf_len == 0) {
|
| 1114 |
ret = -EINVAL; |
| 1115 |
goto out;
|
| 1116 |
} |
| 1117 |
data->lba = sector_num; |
| 1118 |
data->size = buf_len; |
| 1119 |
write_buf = (uint8_t *)data; |
| 1120 |
write_len = buf_len + sizeof(VmdkGrainMarker);
|
| 1121 |
} |
| 1122 |
ret = bdrv_pwrite(extent->file, |
| 1123 |
cluster_offset + offset_in_cluster, |
| 1124 |
write_buf, |
| 1125 |
write_len); |
| 1126 |
if (ret != write_len) {
|
| 1127 |
ret = ret < 0 ? ret : -EIO;
|
| 1128 |
goto out;
|
| 1129 |
} |
| 1130 |
ret = 0;
|
| 1131 |
out:
|
| 1132 |
g_free(data); |
| 1133 |
return ret;
|
| 1134 |
} |
| 1135 |
|
| 1136 |
static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, |
| 1137 |
int64_t offset_in_cluster, uint8_t *buf, |
| 1138 |
int nb_sectors)
|
| 1139 |
{
|
| 1140 |
int ret;
|
| 1141 |
int cluster_bytes, buf_bytes;
|
| 1142 |
uint8_t *cluster_buf, *compressed_data; |
| 1143 |
uint8_t *uncomp_buf; |
| 1144 |
uint32_t data_len; |
| 1145 |
VmdkGrainMarker *marker; |
| 1146 |
uLongf buf_len; |
| 1147 |
|
| 1148 |
|
| 1149 |
if (!extent->compressed) {
|
| 1150 |
ret = bdrv_pread(extent->file, |
| 1151 |
cluster_offset + offset_in_cluster, |
| 1152 |
buf, nb_sectors * 512);
|
| 1153 |
if (ret == nb_sectors * 512) { |
| 1154 |
return 0; |
| 1155 |
} else {
|
| 1156 |
return -EIO;
|
| 1157 |
} |
| 1158 |
} |
| 1159 |
cluster_bytes = extent->cluster_sectors * 512;
|
| 1160 |
/* Read two clusters in case GrainMarker + compressed data > one cluster */
|
| 1161 |
buf_bytes = cluster_bytes * 2;
|
| 1162 |
cluster_buf = g_malloc(buf_bytes); |
| 1163 |
uncomp_buf = g_malloc(cluster_bytes); |
| 1164 |
ret = bdrv_pread(extent->file, |
| 1165 |
cluster_offset, |
| 1166 |
cluster_buf, buf_bytes); |
| 1167 |
if (ret < 0) { |
| 1168 |
goto out;
|
| 1169 |
} |
| 1170 |
compressed_data = cluster_buf; |
| 1171 |
buf_len = cluster_bytes; |
| 1172 |
data_len = cluster_bytes; |
| 1173 |
if (extent->has_marker) {
|
| 1174 |
marker = (VmdkGrainMarker *)cluster_buf; |
| 1175 |
compressed_data = marker->data; |
| 1176 |
data_len = le32_to_cpu(marker->size); |
| 1177 |
} |
| 1178 |
if (!data_len || data_len > buf_bytes) {
|
| 1179 |
ret = -EINVAL; |
| 1180 |
goto out;
|
| 1181 |
} |
| 1182 |
ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); |
| 1183 |
if (ret != Z_OK) {
|
| 1184 |
ret = -EINVAL; |
| 1185 |
goto out;
|
| 1186 |
|
| 1187 |
} |
| 1188 |
if (offset_in_cluster < 0 || |
| 1189 |
offset_in_cluster + nb_sectors * 512 > buf_len) {
|
| 1190 |
ret = -EINVAL; |
| 1191 |
goto out;
|
| 1192 |
} |
| 1193 |
memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512);
|
| 1194 |
ret = 0;
|
| 1195 |
|
| 1196 |
out:
|
| 1197 |
g_free(uncomp_buf); |
| 1198 |
g_free(cluster_buf); |
| 1199 |
return ret;
|
| 1200 |
} |
| 1201 |
|
| 1202 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
| 1203 |
uint8_t *buf, int nb_sectors)
|
| 1204 |
{
|
| 1205 |
BDRVVmdkState *s = bs->opaque; |
| 1206 |
int ret;
|
| 1207 |
uint64_t n, index_in_cluster; |
| 1208 |
uint64_t extent_begin_sector, extent_relative_sector_num; |
| 1209 |
VmdkExtent *extent = NULL;
|
| 1210 |
uint64_t cluster_offset; |
| 1211 |
|
| 1212 |
while (nb_sectors > 0) { |
| 1213 |
extent = find_extent(s, sector_num, extent); |
| 1214 |
if (!extent) {
|
| 1215 |
return -EIO;
|
| 1216 |
} |
| 1217 |
ret = get_cluster_offset( |
| 1218 |
bs, extent, NULL,
|
| 1219 |
sector_num << 9, 0, &cluster_offset); |
| 1220 |
extent_begin_sector = extent->end_sector - extent->sectors; |
| 1221 |
extent_relative_sector_num = sector_num - extent_begin_sector; |
| 1222 |
index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; |
| 1223 |
n = extent->cluster_sectors - index_in_cluster; |
| 1224 |
if (n > nb_sectors) {
|
| 1225 |
n = nb_sectors; |
| 1226 |
} |
| 1227 |
if (ret != VMDK_OK) {
|
| 1228 |
/* if not allocated, try to read from parent image, if exist */
|
| 1229 |
if (bs->backing_hd && ret != VMDK_ZEROED) {
|
| 1230 |
if (!vmdk_is_cid_valid(bs)) {
|
| 1231 |
return -EINVAL;
|
| 1232 |
} |
| 1233 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
| 1234 |
if (ret < 0) { |
| 1235 |
return ret;
|
| 1236 |
} |
| 1237 |
} else {
|
| 1238 |
memset(buf, 0, 512 * n); |
| 1239 |
} |
| 1240 |
} else {
|
| 1241 |
ret = vmdk_read_extent(extent, |
| 1242 |
cluster_offset, index_in_cluster * 512,
|
| 1243 |
buf, n); |
| 1244 |
if (ret) {
|
| 1245 |
return ret;
|
| 1246 |
} |
| 1247 |
} |
| 1248 |
nb_sectors -= n; |
| 1249 |
sector_num += n; |
| 1250 |
buf += n * 512;
|
| 1251 |
} |
| 1252 |
return 0; |
| 1253 |
} |
| 1254 |
|
| 1255 |
static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, |
| 1256 |
uint8_t *buf, int nb_sectors)
|
| 1257 |
{
|
| 1258 |
int ret;
|
| 1259 |
BDRVVmdkState *s = bs->opaque; |
| 1260 |
qemu_co_mutex_lock(&s->lock); |
| 1261 |
ret = vmdk_read(bs, sector_num, buf, nb_sectors); |
| 1262 |
qemu_co_mutex_unlock(&s->lock); |
| 1263 |
return ret;
|
| 1264 |
} |
| 1265 |
|
| 1266 |
/**
|
| 1267 |
* vmdk_write:
|
| 1268 |
* @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
|
| 1269 |
* if possible, otherwise return -ENOTSUP.
|
| 1270 |
* @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
|
| 1271 |
* with each cluster. By dry run we can find if the zero write
|
| 1272 |
* is possible without modifying image data.
|
| 1273 |
*
|
| 1274 |
* Returns: error code with 0 for success.
|
| 1275 |
*/
|
| 1276 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
| 1277 |
const uint8_t *buf, int nb_sectors, |
| 1278 |
bool zeroed, bool zero_dry_run) |
| 1279 |
{
|
| 1280 |
BDRVVmdkState *s = bs->opaque; |
| 1281 |
VmdkExtent *extent = NULL;
|
| 1282 |
int n, ret;
|
| 1283 |
int64_t index_in_cluster; |
| 1284 |
uint64_t extent_begin_sector, extent_relative_sector_num; |
| 1285 |
uint64_t cluster_offset; |
| 1286 |
VmdkMetaData m_data; |
| 1287 |
|
| 1288 |
if (sector_num > bs->total_sectors) {
|
| 1289 |
fprintf(stderr, |
| 1290 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
| 1291 |
" total_sectors=0x%" PRIx64 "\n", |
| 1292 |
sector_num, bs->total_sectors); |
| 1293 |
return -EIO;
|
| 1294 |
} |
| 1295 |
|
| 1296 |
while (nb_sectors > 0) { |
| 1297 |
extent = find_extent(s, sector_num, extent); |
| 1298 |
if (!extent) {
|
| 1299 |
return -EIO;
|
| 1300 |
} |
| 1301 |
ret = get_cluster_offset( |
| 1302 |
bs, |
| 1303 |
extent, |
| 1304 |
&m_data, |
| 1305 |
sector_num << 9, !extent->compressed,
|
| 1306 |
&cluster_offset); |
| 1307 |
if (extent->compressed) {
|
| 1308 |
if (ret == VMDK_OK) {
|
| 1309 |
/* Refuse write to allocated cluster for streamOptimized */
|
| 1310 |
fprintf(stderr, |
| 1311 |
"VMDK: can't write to allocated cluster"
|
| 1312 |
" for streamOptimized\n");
|
| 1313 |
return -EIO;
|
| 1314 |
} else {
|
| 1315 |
/* allocate */
|
| 1316 |
ret = get_cluster_offset( |
| 1317 |
bs, |
| 1318 |
extent, |
| 1319 |
&m_data, |
| 1320 |
sector_num << 9, 1, |
| 1321 |
&cluster_offset); |
| 1322 |
} |
| 1323 |
} |
| 1324 |
if (ret == VMDK_ERROR) {
|
| 1325 |
return -EINVAL;
|
| 1326 |
} |
| 1327 |
extent_begin_sector = extent->end_sector - extent->sectors; |
| 1328 |
extent_relative_sector_num = sector_num - extent_begin_sector; |
| 1329 |
index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; |
| 1330 |
n = extent->cluster_sectors - index_in_cluster; |
| 1331 |
if (n > nb_sectors) {
|
| 1332 |
n = nb_sectors; |
| 1333 |
} |
| 1334 |
if (zeroed) {
|
| 1335 |
/* Do zeroed write, buf is ignored */
|
| 1336 |
if (extent->has_zero_grain &&
|
| 1337 |
index_in_cluster == 0 &&
|
| 1338 |
n >= extent->cluster_sectors) {
|
| 1339 |
n = extent->cluster_sectors; |
| 1340 |
if (!zero_dry_run) {
|
| 1341 |
m_data.offset = VMDK_GTE_ZEROED; |
| 1342 |
/* update L2 tables */
|
| 1343 |
if (vmdk_L2update(extent, &m_data) != VMDK_OK) {
|
| 1344 |
return -EIO;
|
| 1345 |
} |
| 1346 |
} |
| 1347 |
} else {
|
| 1348 |
return -ENOTSUP;
|
| 1349 |
} |
| 1350 |
} else {
|
| 1351 |
ret = vmdk_write_extent(extent, |
| 1352 |
cluster_offset, index_in_cluster * 512,
|
| 1353 |
buf, n, sector_num); |
| 1354 |
if (ret) {
|
| 1355 |
return ret;
|
| 1356 |
} |
| 1357 |
if (m_data.valid) {
|
| 1358 |
/* update L2 tables */
|
| 1359 |
if (vmdk_L2update(extent, &m_data) != VMDK_OK) {
|
| 1360 |
return -EIO;
|
| 1361 |
} |
| 1362 |
} |
| 1363 |
} |
| 1364 |
nb_sectors -= n; |
| 1365 |
sector_num += n; |
| 1366 |
buf += n * 512;
|
| 1367 |
|
| 1368 |
/* update CID on the first write every time the virtual disk is
|
| 1369 |
* opened */
|
| 1370 |
if (!s->cid_updated) {
|
| 1371 |
ret = vmdk_write_cid(bs, time(NULL));
|
| 1372 |
if (ret < 0) { |
| 1373 |
return ret;
|
| 1374 |
} |
| 1375 |
s->cid_updated = true;
|
| 1376 |
} |
| 1377 |
} |
| 1378 |
return 0; |
| 1379 |
} |
| 1380 |
|
| 1381 |
static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, |
| 1382 |
const uint8_t *buf, int nb_sectors) |
| 1383 |
{
|
| 1384 |
int ret;
|
| 1385 |
BDRVVmdkState *s = bs->opaque; |
| 1386 |
qemu_co_mutex_lock(&s->lock); |
| 1387 |
ret = vmdk_write(bs, sector_num, buf, nb_sectors, false, false); |
| 1388 |
qemu_co_mutex_unlock(&s->lock); |
| 1389 |
return ret;
|
| 1390 |
} |
| 1391 |
|
| 1392 |
static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs, |
| 1393 |
int64_t sector_num, |
| 1394 |
int nb_sectors)
|
| 1395 |
{
|
| 1396 |
int ret;
|
| 1397 |
BDRVVmdkState *s = bs->opaque; |
| 1398 |
qemu_co_mutex_lock(&s->lock); |
| 1399 |
/* write zeroes could fail if sectors not aligned to cluster, test it with
|
| 1400 |
* dry_run == true before really updating image */
|
| 1401 |
ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, true); |
| 1402 |
if (!ret) {
|
| 1403 |
ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, false); |
| 1404 |
} |
| 1405 |
qemu_co_mutex_unlock(&s->lock); |
| 1406 |
return ret;
|
| 1407 |
} |
| 1408 |
|
| 1409 |
static int vmdk_create_extent(const char *filename, int64_t filesize, |
| 1410 |
bool flat, bool compress, bool zeroed_grain) |
| 1411 |
{
|
| 1412 |
int ret, i;
|
| 1413 |
int fd = 0; |
| 1414 |
VMDK4Header header; |
| 1415 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
| 1416 |
|
| 1417 |
fd = qemu_open(filename, |
| 1418 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
| 1419 |
0644);
|
| 1420 |
if (fd < 0) { |
| 1421 |
return -errno;
|
| 1422 |
} |
| 1423 |
if (flat) {
|
| 1424 |
ret = ftruncate(fd, filesize); |
| 1425 |
if (ret < 0) { |
| 1426 |
ret = -errno; |
| 1427 |
} |
| 1428 |
goto exit;
|
| 1429 |
} |
| 1430 |
magic = cpu_to_be32(VMDK4_MAGIC); |
| 1431 |
memset(&header, 0, sizeof(header)); |
| 1432 |
header.version = zeroed_grain ? 2 : 1; |
| 1433 |
header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT |
| 1434 |
| (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0)
|
| 1435 |
| (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0);
|
| 1436 |
header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
|
| 1437 |
header.capacity = filesize / 512;
|
| 1438 |
header.granularity = 128;
|
| 1439 |
header.num_gtes_per_gt = 512;
|
| 1440 |
|
| 1441 |
grains = (filesize / 512 + header.granularity - 1) / header.granularity; |
| 1442 |
gt_size = ((header.num_gtes_per_gt * sizeof(uint32_t)) + 511) >> 9; |
| 1443 |
gt_count = |
| 1444 |
(grains + header.num_gtes_per_gt - 1) / header.num_gtes_per_gt;
|
| 1445 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
| 1446 |
|
| 1447 |
header.desc_offset = 1;
|
| 1448 |
header.desc_size = 20;
|
| 1449 |
header.rgd_offset = header.desc_offset + header.desc_size; |
| 1450 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
| 1451 |
header.grain_offset = |
| 1452 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
| 1453 |
header.granularity - 1) / header.granularity) *
|
| 1454 |
header.granularity; |
| 1455 |
/* swap endianness for all header fields */
|
| 1456 |
header.version = cpu_to_le32(header.version); |
| 1457 |
header.flags = cpu_to_le32(header.flags); |
| 1458 |
header.capacity = cpu_to_le64(header.capacity); |
| 1459 |
header.granularity = cpu_to_le64(header.granularity); |
| 1460 |
header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); |
| 1461 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
| 1462 |
header.desc_size = cpu_to_le64(header.desc_size); |
| 1463 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
| 1464 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
| 1465 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
| 1466 |
header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); |
| 1467 |
|
| 1468 |
header.check_bytes[0] = 0xa; |
| 1469 |
header.check_bytes[1] = 0x20; |
| 1470 |
header.check_bytes[2] = 0xd; |
| 1471 |
header.check_bytes[3] = 0xa; |
| 1472 |
|
| 1473 |
/* write all the data */
|
| 1474 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
| 1475 |
if (ret != sizeof(magic)) { |
| 1476 |
ret = -errno; |
| 1477 |
goto exit;
|
| 1478 |
} |
| 1479 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
| 1480 |
if (ret != sizeof(header)) { |
| 1481 |
ret = -errno; |
| 1482 |
goto exit;
|
| 1483 |
} |
| 1484 |
|
| 1485 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
| 1486 |
if (ret < 0) { |
| 1487 |
ret = -errno; |
| 1488 |
goto exit;
|
| 1489 |
} |
| 1490 |
|
| 1491 |
/* write grain directory */
|
| 1492 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
| 1493 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
| 1494 |
i < gt_count; i++, tmp += gt_size) {
|
| 1495 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
| 1496 |
if (ret != sizeof(tmp)) { |
| 1497 |
ret = -errno; |
| 1498 |
goto exit;
|
| 1499 |
} |
| 1500 |
} |
| 1501 |
|
| 1502 |
/* write backup grain directory */
|
| 1503 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
| 1504 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
| 1505 |
i < gt_count; i++, tmp += gt_size) {
|
| 1506 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
| 1507 |
if (ret != sizeof(tmp)) { |
| 1508 |
ret = -errno; |
| 1509 |
goto exit;
|
| 1510 |
} |
| 1511 |
} |
| 1512 |
|
| 1513 |
ret = 0;
|
| 1514 |
exit:
|
| 1515 |
qemu_close(fd); |
| 1516 |
return ret;
|
| 1517 |
} |
| 1518 |
|
| 1519 |
static int filename_decompose(const char *filename, char *path, char *prefix, |
| 1520 |
char *postfix, size_t buf_len)
|
| 1521 |
{
|
| 1522 |
const char *p, *q; |
| 1523 |
|
| 1524 |
if (filename == NULL || !strlen(filename)) { |
| 1525 |
fprintf(stderr, "Vmdk: no filename provided.\n");
|
| 1526 |
return VMDK_ERROR;
|
| 1527 |
} |
| 1528 |
p = strrchr(filename, '/');
|
| 1529 |
if (p == NULL) { |
| 1530 |
p = strrchr(filename, '\\');
|
| 1531 |
} |
| 1532 |
if (p == NULL) { |
| 1533 |
p = strrchr(filename, ':');
|
| 1534 |
} |
| 1535 |
if (p != NULL) { |
| 1536 |
p++; |
| 1537 |
if (p - filename >= buf_len) {
|
| 1538 |
return VMDK_ERROR;
|
| 1539 |
} |
| 1540 |
pstrcpy(path, p - filename + 1, filename);
|
| 1541 |
} else {
|
| 1542 |
p = filename; |
| 1543 |
path[0] = '\0'; |
| 1544 |
} |
| 1545 |
q = strrchr(p, '.');
|
| 1546 |
if (q == NULL) { |
| 1547 |
pstrcpy(prefix, buf_len, p); |
| 1548 |
postfix[0] = '\0'; |
| 1549 |
} else {
|
| 1550 |
if (q - p >= buf_len) {
|
| 1551 |
return VMDK_ERROR;
|
| 1552 |
} |
| 1553 |
pstrcpy(prefix, q - p + 1, p);
|
| 1554 |
pstrcpy(postfix, buf_len, q); |
| 1555 |
} |
| 1556 |
return VMDK_OK;
|
| 1557 |
} |
| 1558 |
|
| 1559 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options, |
| 1560 |
Error **errp) |
| 1561 |
{
|
| 1562 |
int fd, idx = 0; |
| 1563 |
char desc[BUF_SIZE];
|
| 1564 |
int64_t total_size = 0, filesize;
|
| 1565 |
const char *adapter_type = NULL; |
| 1566 |
const char *backing_file = NULL; |
| 1567 |
const char *fmt = NULL; |
| 1568 |
int flags = 0; |
| 1569 |
int ret = 0; |
| 1570 |
bool flat, split, compress;
|
| 1571 |
char ext_desc_lines[BUF_SIZE] = ""; |
| 1572 |
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
|
| 1573 |
const int64_t split_size = 0x80000000; /* VMDK has constant split size */ |
| 1574 |
const char *desc_extent_line; |
| 1575 |
char parent_desc_line[BUF_SIZE] = ""; |
| 1576 |
uint32_t parent_cid = 0xffffffff;
|
| 1577 |
uint32_t number_heads = 16;
|
| 1578 |
bool zeroed_grain = false; |
| 1579 |
const char desc_template[] = |
| 1580 |
"# Disk DescriptorFile\n"
|
| 1581 |
"version=1\n"
|
| 1582 |
"CID=%x\n"
|
| 1583 |
"parentCID=%x\n"
|
| 1584 |
"createType=\"%s\"\n"
|
| 1585 |
"%s"
|
| 1586 |
"\n"
|
| 1587 |
"# Extent description\n"
|
| 1588 |
"%s"
|
| 1589 |
"\n"
|
| 1590 |
"# The Disk Data Base\n"
|
| 1591 |
"#DDB\n"
|
| 1592 |
"\n"
|
| 1593 |
"ddb.virtualHWVersion = \"%d\"\n"
|
| 1594 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
| 1595 |
"ddb.geometry.heads = \"%d\"\n"
|
| 1596 |
"ddb.geometry.sectors = \"63\"\n"
|
| 1597 |
"ddb.adapterType = \"%s\"\n";
|
| 1598 |
Error *local_err = NULL;
|
| 1599 |
|
| 1600 |
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
|
| 1601 |
return -EINVAL;
|
| 1602 |
} |
| 1603 |
/* Read out options */
|
| 1604 |
while (options && options->name) {
|
| 1605 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
| 1606 |
total_size = options->value.n; |
| 1607 |
} else if (!strcmp(options->name, BLOCK_OPT_ADAPTER_TYPE)) { |
| 1608 |
adapter_type = options->value.s; |
| 1609 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
| 1610 |
backing_file = options->value.s; |
| 1611 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
| 1612 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
|
| 1613 |
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { |
| 1614 |
fmt = options->value.s; |
| 1615 |
} else if (!strcmp(options->name, BLOCK_OPT_ZEROED_GRAIN)) { |
| 1616 |
zeroed_grain |= options->value.n; |
| 1617 |
} |
| 1618 |
options++; |
| 1619 |
} |
| 1620 |
if (!adapter_type) {
|
| 1621 |
adapter_type = "ide";
|
| 1622 |
} else if (strcmp(adapter_type, "ide") && |
| 1623 |
strcmp(adapter_type, "buslogic") &&
|
| 1624 |
strcmp(adapter_type, "lsilogic") &&
|
| 1625 |
strcmp(adapter_type, "legacyESX")) {
|
| 1626 |
fprintf(stderr, "VMDK: Unknown adapter type: '%s'.\n", adapter_type);
|
| 1627 |
return -EINVAL;
|
| 1628 |
} |
| 1629 |
if (strcmp(adapter_type, "ide") != 0) { |
| 1630 |
/* that's the number of heads with which vmware operates when
|
| 1631 |
creating, exporting, etc. vmdk files with a non-ide adapter type */
|
| 1632 |
number_heads = 255;
|
| 1633 |
} |
| 1634 |
if (!fmt) {
|
| 1635 |
/* Default format to monolithicSparse */
|
| 1636 |
fmt = "monolithicSparse";
|
| 1637 |
} else if (strcmp(fmt, "monolithicFlat") && |
| 1638 |
strcmp(fmt, "monolithicSparse") &&
|
| 1639 |
strcmp(fmt, "twoGbMaxExtentSparse") &&
|
| 1640 |
strcmp(fmt, "twoGbMaxExtentFlat") &&
|
| 1641 |
strcmp(fmt, "streamOptimized")) {
|
| 1642 |
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
|
| 1643 |
return -EINVAL;
|
| 1644 |
} |
| 1645 |
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
|
| 1646 |
strcmp(fmt, "twoGbMaxExtentSparse"));
|
| 1647 |
flat = !(strcmp(fmt, "monolithicFlat") &&
|
| 1648 |
strcmp(fmt, "twoGbMaxExtentFlat"));
|
| 1649 |
compress = !strcmp(fmt, "streamOptimized");
|
| 1650 |
if (flat) {
|
| 1651 |
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
| 1652 |
} else {
|
| 1653 |
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
| 1654 |
} |
| 1655 |
if (flat && backing_file) {
|
| 1656 |
/* not supporting backing file for flat image */
|
| 1657 |
return -ENOTSUP;
|
| 1658 |
} |
| 1659 |
if (backing_file) {
|
| 1660 |
BlockDriverState *bs = bdrv_new("");
|
| 1661 |
ret = bdrv_open(bs, backing_file, NULL, 0, NULL, &local_err); |
| 1662 |
if (ret != 0) { |
| 1663 |
qerror_report_err(local_err); |
| 1664 |
error_free(local_err); |
| 1665 |
bdrv_unref(bs); |
| 1666 |
return ret;
|
| 1667 |
} |
| 1668 |
if (strcmp(bs->drv->format_name, "vmdk")) { |
| 1669 |
bdrv_unref(bs); |
| 1670 |
return -EINVAL;
|
| 1671 |
} |
| 1672 |
parent_cid = vmdk_read_cid(bs, 0);
|
| 1673 |
bdrv_unref(bs); |
| 1674 |
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
| 1675 |
"parentFileNameHint=\"%s\"", backing_file);
|
| 1676 |
} |
| 1677 |
|
| 1678 |
/* Create extents */
|
| 1679 |
filesize = total_size; |
| 1680 |
while (filesize > 0) { |
| 1681 |
char desc_line[BUF_SIZE];
|
| 1682 |
char ext_filename[PATH_MAX];
|
| 1683 |
char desc_filename[PATH_MAX];
|
| 1684 |
int64_t size = filesize; |
| 1685 |
|
| 1686 |
if (split && size > split_size) {
|
| 1687 |
size = split_size; |
| 1688 |
} |
| 1689 |
if (split) {
|
| 1690 |
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", |
| 1691 |
prefix, flat ? 'f' : 's', ++idx, postfix); |
| 1692 |
} else if (flat) { |
| 1693 |
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", |
| 1694 |
prefix, postfix); |
| 1695 |
} else {
|
| 1696 |
snprintf(desc_filename, sizeof(desc_filename), "%s%s", |
| 1697 |
prefix, postfix); |
| 1698 |
} |
| 1699 |
snprintf(ext_filename, sizeof(ext_filename), "%s%s", |
| 1700 |
path, desc_filename); |
| 1701 |
|
| 1702 |
if (vmdk_create_extent(ext_filename, size,
|
| 1703 |
flat, compress, zeroed_grain)) {
|
| 1704 |
return -EINVAL;
|
| 1705 |
} |
| 1706 |
filesize -= size; |
| 1707 |
|
| 1708 |
/* Format description line */
|
| 1709 |
snprintf(desc_line, sizeof(desc_line),
|
| 1710 |
desc_extent_line, size / 512, desc_filename);
|
| 1711 |
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
| 1712 |
} |
| 1713 |
/* generate descriptor file */
|
| 1714 |
snprintf(desc, sizeof(desc), desc_template,
|
| 1715 |
(unsigned int)time(NULL), |
| 1716 |
parent_cid, |
| 1717 |
fmt, |
| 1718 |
parent_desc_line, |
| 1719 |
ext_desc_lines, |
| 1720 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
| 1721 |
total_size / (int64_t)(63 * number_heads * 512), number_heads, |
| 1722 |
adapter_type); |
| 1723 |
if (split || flat) {
|
| 1724 |
fd = qemu_open(filename, |
| 1725 |
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
| 1726 |
0644);
|
| 1727 |
} else {
|
| 1728 |
fd = qemu_open(filename, |
| 1729 |
O_WRONLY | O_BINARY | O_LARGEFILE, |
| 1730 |
0644);
|
| 1731 |
} |
| 1732 |
if (fd < 0) { |
| 1733 |
return -errno;
|
| 1734 |
} |
| 1735 |
/* the descriptor offset = 0x200 */
|
| 1736 |
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { |
| 1737 |
ret = -errno; |
| 1738 |
goto exit;
|
| 1739 |
} |
| 1740 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
| 1741 |
if (ret != strlen(desc)) {
|
| 1742 |
ret = -errno; |
| 1743 |
goto exit;
|
| 1744 |
} |
| 1745 |
ret = 0;
|
| 1746 |
exit:
|
| 1747 |
qemu_close(fd); |
| 1748 |
return ret;
|
| 1749 |
} |
| 1750 |
|
| 1751 |
static void vmdk_close(BlockDriverState *bs) |
| 1752 |
{
|
| 1753 |
BDRVVmdkState *s = bs->opaque; |
| 1754 |
|
| 1755 |
vmdk_free_extents(bs); |
| 1756 |
|
| 1757 |
migrate_del_blocker(s->migration_blocker); |
| 1758 |
error_free(s->migration_blocker); |
| 1759 |
} |
| 1760 |
|
| 1761 |
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) |
| 1762 |
{
|
| 1763 |
BDRVVmdkState *s = bs->opaque; |
| 1764 |
int i, err;
|
| 1765 |
int ret = 0; |
| 1766 |
|
| 1767 |
for (i = 0; i < s->num_extents; i++) { |
| 1768 |
err = bdrv_co_flush(s->extents[i].file); |
| 1769 |
if (err < 0) { |
| 1770 |
ret = err; |
| 1771 |
} |
| 1772 |
} |
| 1773 |
return ret;
|
| 1774 |
} |
| 1775 |
|
| 1776 |
static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
|
| 1777 |
{
|
| 1778 |
int i;
|
| 1779 |
int64_t ret = 0;
|
| 1780 |
int64_t r; |
| 1781 |
BDRVVmdkState *s = bs->opaque; |
| 1782 |
|
| 1783 |
ret = bdrv_get_allocated_file_size(bs->file); |
| 1784 |
if (ret < 0) { |
| 1785 |
return ret;
|
| 1786 |
} |
| 1787 |
for (i = 0; i < s->num_extents; i++) { |
| 1788 |
if (s->extents[i].file == bs->file) {
|
| 1789 |
continue;
|
| 1790 |
} |
| 1791 |
r = bdrv_get_allocated_file_size(s->extents[i].file); |
| 1792 |
if (r < 0) { |
| 1793 |
return r;
|
| 1794 |
} |
| 1795 |
ret += r; |
| 1796 |
} |
| 1797 |
return ret;
|
| 1798 |
} |
| 1799 |
|
| 1800 |
static int vmdk_has_zero_init(BlockDriverState *bs) |
| 1801 |
{
|
| 1802 |
int i;
|
| 1803 |
BDRVVmdkState *s = bs->opaque; |
| 1804 |
|
| 1805 |
/* If has a flat extent and its underlying storage doesn't have zero init,
|
| 1806 |
* return 0. */
|
| 1807 |
for (i = 0; i < s->num_extents; i++) { |
| 1808 |
if (s->extents[i].flat) {
|
| 1809 |
if (!bdrv_has_zero_init(s->extents[i].file)) {
|
| 1810 |
return 0; |
| 1811 |
} |
| 1812 |
} |
| 1813 |
} |
| 1814 |
return 1; |
| 1815 |
} |
| 1816 |
|
| 1817 |
static QEMUOptionParameter vmdk_create_options[] = {
|
| 1818 |
{
|
| 1819 |
.name = BLOCK_OPT_SIZE, |
| 1820 |
.type = OPT_SIZE, |
| 1821 |
.help = "Virtual disk size"
|
| 1822 |
}, |
| 1823 |
{
|
| 1824 |
.name = BLOCK_OPT_ADAPTER_TYPE, |
| 1825 |
.type = OPT_STRING, |
| 1826 |
.help = "Virtual adapter type, can be one of "
|
| 1827 |
"ide (default), lsilogic, buslogic or legacyESX"
|
| 1828 |
}, |
| 1829 |
{
|
| 1830 |
.name = BLOCK_OPT_BACKING_FILE, |
| 1831 |
.type = OPT_STRING, |
| 1832 |
.help = "File name of a base image"
|
| 1833 |
}, |
| 1834 |
{
|
| 1835 |
.name = BLOCK_OPT_COMPAT6, |
| 1836 |
.type = OPT_FLAG, |
| 1837 |
.help = "VMDK version 6 image"
|
| 1838 |
}, |
| 1839 |
{
|
| 1840 |
.name = BLOCK_OPT_SUBFMT, |
| 1841 |
.type = OPT_STRING, |
| 1842 |
.help = |
| 1843 |
"VMDK flat extent format, can be one of "
|
| 1844 |
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
|
| 1845 |
}, |
| 1846 |
{
|
| 1847 |
.name = BLOCK_OPT_ZEROED_GRAIN, |
| 1848 |
.type = OPT_FLAG, |
| 1849 |
.help = "Enable efficient zero writes using the zeroed-grain GTE feature"
|
| 1850 |
}, |
| 1851 |
{ NULL }
|
| 1852 |
}; |
| 1853 |
|
| 1854 |
static BlockDriver bdrv_vmdk = {
|
| 1855 |
.format_name = "vmdk",
|
| 1856 |
.instance_size = sizeof(BDRVVmdkState),
|
| 1857 |
.bdrv_probe = vmdk_probe, |
| 1858 |
.bdrv_open = vmdk_open, |
| 1859 |
.bdrv_reopen_prepare = vmdk_reopen_prepare, |
| 1860 |
.bdrv_read = vmdk_co_read, |
| 1861 |
.bdrv_write = vmdk_co_write, |
| 1862 |
.bdrv_co_write_zeroes = vmdk_co_write_zeroes, |
| 1863 |
.bdrv_close = vmdk_close, |
| 1864 |
.bdrv_create = vmdk_create, |
| 1865 |
.bdrv_co_flush_to_disk = vmdk_co_flush, |
| 1866 |
.bdrv_co_get_block_status = vmdk_co_get_block_status, |
| 1867 |
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, |
| 1868 |
.bdrv_has_zero_init = vmdk_has_zero_init, |
| 1869 |
|
| 1870 |
.create_options = vmdk_create_options, |
| 1871 |
}; |
| 1872 |
|
| 1873 |
static void bdrv_vmdk_init(void) |
| 1874 |
{
|
| 1875 |
bdrv_register(&bdrv_vmdk); |
| 1876 |
} |
| 1877 |
|
| 1878 |
block_init(bdrv_vmdk_init); |