1364 lines
38 KiB
C
1364 lines
38 KiB
C
/*
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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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#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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typedef struct {
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uint32_t version;
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uint32_t flags;
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uint32_t disk_sectors;
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uint32_t granularity;
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uint32_t l1dir_offset;
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uint32_t l1dir_size;
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uint32_t file_sectors;
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uint32_t cylinders;
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uint32_t heads;
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uint32_t sectors_per_track;
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} VMDK3Header;
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typedef struct {
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uint32_t version;
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uint32_t flags;
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int64_t capacity;
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int64_t granularity;
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int64_t desc_offset;
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int64_t desc_size;
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int32_t num_gtes_per_gte;
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int64_t rgd_offset;
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int64_t gd_offset;
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int64_t grain_offset;
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char filler[1];
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char check_bytes[4];
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} __attribute__((packed)) VMDK4Header;
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#define L2_CACHE_SIZE 16
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typedef struct VmdkExtent {
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BlockDriverState *file;
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bool flat;
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int64_t sectors;
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int64_t end_sector;
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int64_t flat_start_offset;
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int64_t l1_table_offset;
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int64_t l1_backup_table_offset;
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uint32_t *l1_table;
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uint32_t *l1_backup_table;
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unsigned int l1_size;
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uint32_t l1_entry_sectors;
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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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unsigned int cluster_sectors;
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} VmdkExtent;
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typedef struct BDRVVmdkState {
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int desc_offset;
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bool cid_updated;
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uint32_t parent_cid;
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int num_extents;
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/* Extent array with num_extents entries, ascend ordered by address */
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VmdkExtent *extents;
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} BDRVVmdkState;
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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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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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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;
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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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}
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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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}
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if (end - p >= strlen("version=X\n")) {
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if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 ||
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strncmp("version=2\n", p, strlen("version=2\n")) == 0) {
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return 100;
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}
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}
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if (end - p >= strlen("version=X\r\n")) {
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if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 ||
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strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) {
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return 100;
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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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#define CHECK_CID 1
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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 */
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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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for (i = 0; i < s->num_extents; i++) {
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qemu_free(s->extents[i].l1_table);
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qemu_free(s->extents[i].l2_cache);
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qemu_free(s->extents[i].l1_backup_table);
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}
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qemu_free(s->extents);
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}
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
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{
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char desc[DESC_SIZE];
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uint32_t cid;
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const char *p_name, *cid_str;
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size_t cid_str_size;
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BDRVVmdkState *s = bs->opaque;
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return 0;
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}
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if (parent) {
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cid_str = "parentCID";
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cid_str_size = sizeof("parentCID");
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} else {
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cid_str = "CID";
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cid_str_size = sizeof("CID");
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}
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p_name = strstr(desc, cid_str);
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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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}
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return cid;
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}
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static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
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{
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char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
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char *p_name, *tmp_str;
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BDRVVmdkState *s = bs->opaque;
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memset(desc, 0, sizeof(desc));
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return -EIO;
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}
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tmp_str = strstr(desc, "parentCID");
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pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
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p_name = strstr(desc, "CID");
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if (p_name != NULL) {
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p_name += sizeof("CID");
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snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid);
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pstrcat(desc, sizeof(desc), tmp_desc);
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}
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if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) {
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return -EIO;
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}
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return 0;
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}
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static int vmdk_is_cid_valid(BlockDriverState *bs)
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{
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#ifdef CHECK_CID
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BDRVVmdkState *s = bs->opaque;
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BlockDriverState *p_bs = bs->backing_hd;
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uint32_t cur_pcid;
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if (p_bs) {
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cur_pcid = vmdk_read_cid(p_bs, 0);
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if (s->parent_cid != cur_pcid) {
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/* CID not valid */
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return 0;
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}
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}
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#endif
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/* CID valid */
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return 1;
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}
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static int vmdk_parent_open(BlockDriverState *bs)
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{
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char *p_name;
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char desc[DESC_SIZE + 1];
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BDRVVmdkState *s = bs->opaque;
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desc[DESC_SIZE] = '\0';
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if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
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return -1;
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}
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p_name = strstr(desc, "parentFileNameHint");
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if (p_name != NULL) {
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char *end_name;
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p_name += sizeof("parentFileNameHint") + 1;
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end_name = strchr(p_name, '\"');
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if (end_name == NULL) {
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return -1;
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}
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if ((end_name - p_name) > sizeof(bs->backing_file) - 1) {
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return -1;
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}
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pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
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}
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return 0;
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}
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/* Create and append extent to the extent array. Return the added VmdkExtent
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* address. return NULL if allocation failed. */
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static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
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BlockDriverState *file, bool flat, int64_t sectors,
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int64_t l1_offset, int64_t l1_backup_offset,
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uint32_t l1_size,
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int l2_size, unsigned int cluster_sectors)
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{
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VmdkExtent *extent;
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BDRVVmdkState *s = bs->opaque;
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s->extents = qemu_realloc(s->extents,
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(s->num_extents + 1) * sizeof(VmdkExtent));
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extent = &s->extents[s->num_extents];
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s->num_extents++;
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memset(extent, 0, sizeof(VmdkExtent));
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extent->file = file;
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extent->flat = flat;
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extent->sectors = sectors;
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extent->l1_table_offset = l1_offset;
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extent->l1_backup_table_offset = l1_backup_offset;
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extent->l1_size = l1_size;
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extent->l1_entry_sectors = l2_size * cluster_sectors;
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extent->l2_size = l2_size;
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extent->cluster_sectors = cluster_sectors;
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|
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if (s->num_extents > 1) {
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extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
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} else {
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extent->end_sector = extent->sectors;
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}
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bs->total_sectors = extent->end_sector;
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return extent;
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}
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|
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static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent)
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{
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int ret;
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int l1_size, i;
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|
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/* read the L1 table */
|
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l1_size = extent->l1_size * sizeof(uint32_t);
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extent->l1_table = qemu_malloc(l1_size);
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ret = bdrv_pread(extent->file,
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extent->l1_table_offset,
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extent->l1_table,
|
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l1_size);
|
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if (ret < 0) {
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goto fail_l1;
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}
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for (i = 0; i < extent->l1_size; i++) {
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le32_to_cpus(&extent->l1_table[i]);
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}
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|
|
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if (extent->l1_backup_table_offset) {
|
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extent->l1_backup_table = qemu_malloc(l1_size);
|
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ret = bdrv_pread(extent->file,
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extent->l1_backup_table_offset,
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extent->l1_backup_table,
|
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l1_size);
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if (ret < 0) {
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goto fail_l1b;
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}
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for (i = 0; i < extent->l1_size; i++) {
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le32_to_cpus(&extent->l1_backup_table[i]);
|
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}
|
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}
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|
|
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extent->l2_cache =
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qemu_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
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return 0;
|
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fail_l1b:
|
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qemu_free(extent->l1_backup_table);
|
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fail_l1:
|
|
qemu_free(extent->l1_table);
|
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return ret;
|
|
}
|
|
|
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static int vmdk_open_vmdk3(BlockDriverState *bs, int flags)
|
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{
|
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int ret;
|
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uint32_t magic;
|
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VMDK3Header header;
|
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BDRVVmdkState *s = bs->opaque;
|
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VmdkExtent *extent;
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|
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s->desc_offset = 0x200;
|
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ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header));
|
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if (ret < 0) {
|
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goto fail;
|
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}
|
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extent = vmdk_add_extent(bs,
|
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bs->file, false,
|
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le32_to_cpu(header.disk_sectors),
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le32_to_cpu(header.l1dir_offset) << 9,
|
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0, 1 << 6, 1 << 9,
|
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le32_to_cpu(header.granularity));
|
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ret = vmdk_init_tables(bs, extent);
|
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if (ret) {
|
|
/* vmdk_init_tables cleans up on fail, so only free allocation of
|
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* vmdk_add_extent here. */
|
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goto fail;
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}
|
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return 0;
|
|
fail:
|
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vmdk_free_extents(bs);
|
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return ret;
|
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}
|
|
|
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static int vmdk_open_vmdk4(BlockDriverState *bs, int flags)
|
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{
|
|
int ret;
|
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uint32_t magic;
|
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uint32_t l1_size, l1_entry_sectors;
|
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VMDK4Header header;
|
|
BDRVVmdkState *s = bs->opaque;
|
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VmdkExtent *extent;
|
|
|
|
s->desc_offset = 0x200;
|
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ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header));
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte)
|
|
* le64_to_cpu(header.granularity);
|
|
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
|
/ l1_entry_sectors;
|
|
extent = vmdk_add_extent(bs, bs->file, false,
|
|
le64_to_cpu(header.capacity),
|
|
le64_to_cpu(header.gd_offset) << 9,
|
|
le64_to_cpu(header.rgd_offset) << 9,
|
|
l1_size,
|
|
le32_to_cpu(header.num_gtes_per_gte),
|
|
le64_to_cpu(header.granularity));
|
|
if (extent->l1_entry_sectors <= 0) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
/* try to open parent images, if exist */
|
|
ret = vmdk_parent_open(bs);
|
|
if (ret) {
|
|
goto fail;
|
|
}
|
|
s->parent_cid = vmdk_read_cid(bs, 1);
|
|
ret = vmdk_init_tables(bs, extent);
|
|
if (ret) {
|
|
goto fail;
|
|
}
|
|
return 0;
|
|
fail:
|
|
vmdk_free_extents(bs);
|
|
return ret;
|
|
}
|
|
|
|
/* find an option value out of descriptor file */
|
|
static int vmdk_parse_description(const char *desc, const char *opt_name,
|
|
char *buf, int buf_size)
|
|
{
|
|
char *opt_pos, *opt_end;
|
|
const char *end = desc + strlen(desc);
|
|
|
|
opt_pos = strstr(desc, opt_name);
|
|
if (!opt_pos) {
|
|
return -1;
|
|
}
|
|
/* Skip "=\"" following opt_name */
|
|
opt_pos += strlen(opt_name) + 2;
|
|
if (opt_pos >= end) {
|
|
return -1;
|
|
}
|
|
opt_end = opt_pos;
|
|
while (opt_end < end && *opt_end != '"') {
|
|
opt_end++;
|
|
}
|
|
if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
|
|
return -1;
|
|
}
|
|
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
|
|
const char *desc_file_path)
|
|
{
|
|
int ret;
|
|
char access[11];
|
|
char type[11];
|
|
char fname[512];
|
|
const char *p = desc;
|
|
int64_t sectors = 0;
|
|
int64_t flat_offset;
|
|
|
|
while (*p) {
|
|
/* parse extent line:
|
|
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
|
|
* or
|
|
* RW [size in sectors] SPARSE "file-name.vmdk"
|
|
*/
|
|
flat_offset = -1;
|
|
ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64,
|
|
access, §ors, type, fname, &flat_offset);
|
|
if (ret < 4 || strcmp(access, "RW")) {
|
|
goto next_line;
|
|
} else if (!strcmp(type, "FLAT")) {
|
|
if (ret != 5 || flat_offset < 0) {
|
|
return -EINVAL;
|
|
}
|
|
} else if (ret != 4) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* trim the quotation marks around */
|
|
if (fname[0] == '"') {
|
|
memmove(fname, fname + 1, strlen(fname));
|
|
if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') {
|
|
return -EINVAL;
|
|
}
|
|
fname[strlen(fname) - 1] = '\0';
|
|
}
|
|
if (sectors <= 0 ||
|
|
(strcmp(type, "FLAT") && strcmp(type, "SPARSE")) ||
|
|
(strcmp(access, "RW"))) {
|
|
goto next_line;
|
|
}
|
|
|
|
/* save to extents array */
|
|
if (!strcmp(type, "FLAT")) {
|
|
/* FLAT extent */
|
|
char extent_path[PATH_MAX];
|
|
BlockDriverState *extent_file;
|
|
VmdkExtent *extent;
|
|
|
|
path_combine(extent_path, sizeof(extent_path),
|
|
desc_file_path, fname);
|
|
ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
extent = vmdk_add_extent(bs, extent_file, true, sectors,
|
|
0, 0, 0, 0, sectors);
|
|
extent->flat_start_offset = flat_offset;
|
|
} else {
|
|
/* SPARSE extent, not supported for now */
|
|
fprintf(stderr,
|
|
"VMDK: Not supported extent type \"%s\""".\n", type);
|
|
return -ENOTSUP;
|
|
}
|
|
next_line:
|
|
/* move to next line */
|
|
while (*p && *p != '\n') {
|
|
p++;
|
|
}
|
|
p++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_open_desc_file(BlockDriverState *bs, int flags)
|
|
{
|
|
int ret;
|
|
char buf[2048];
|
|
char ct[128];
|
|
BDRVVmdkState *s = bs->opaque;
|
|
|
|
ret = bdrv_pread(bs->file, 0, buf, sizeof(buf));
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
buf[2047] = '\0';
|
|
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
|
|
return -EINVAL;
|
|
}
|
|
if (strcmp(ct, "monolithicFlat")) {
|
|
fprintf(stderr,
|
|
"VMDK: Not supported image type \"%s\""".\n", ct);
|
|
return -ENOTSUP;
|
|
}
|
|
s->desc_offset = 0;
|
|
ret = vmdk_parse_extents(buf, bs, bs->file->filename);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
/* try to open parent images, if exist */
|
|
if (vmdk_parent_open(bs)) {
|
|
qemu_free(s->extents);
|
|
return -EINVAL;
|
|
}
|
|
s->parent_cid = vmdk_read_cid(bs, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_open(BlockDriverState *bs, int flags)
|
|
{
|
|
uint32_t magic;
|
|
|
|
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) {
|
|
return -EIO;
|
|
}
|
|
|
|
magic = be32_to_cpu(magic);
|
|
if (magic == VMDK3_MAGIC) {
|
|
return vmdk_open_vmdk3(bs, flags);
|
|
} else if (magic == VMDK4_MAGIC) {
|
|
return vmdk_open_vmdk4(bs, flags);
|
|
} else {
|
|
return vmdk_open_desc_file(bs, flags);
|
|
}
|
|
}
|
|
|
|
static int get_whole_cluster(BlockDriverState *bs,
|
|
VmdkExtent *extent,
|
|
uint64_t cluster_offset,
|
|
uint64_t offset,
|
|
bool allocate)
|
|
{
|
|
/* 128 sectors * 512 bytes each = grain size 64KB */
|
|
uint8_t whole_grain[extent->cluster_sectors * 512];
|
|
|
|
/* we will be here if it's first write on non-exist grain(cluster).
|
|
* try to read from parent image, if exist */
|
|
if (bs->backing_hd) {
|
|
int ret;
|
|
|
|
if (!vmdk_is_cid_valid(bs)) {
|
|
return -1;
|
|
}
|
|
|
|
/* floor offset to cluster */
|
|
offset -= offset % (extent->cluster_sectors * 512);
|
|
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
|
extent->cluster_sectors);
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* Write grain only into the active image */
|
|
ret = bdrv_write(extent->file, cluster_offset, whole_grain,
|
|
extent->cluster_sectors);
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data)
|
|
{
|
|
/* update L2 table */
|
|
if (bdrv_pwrite_sync(
|
|
extent->file,
|
|
((int64_t)m_data->l2_offset * 512)
|
|
+ (m_data->l2_index * sizeof(m_data->offset)),
|
|
&(m_data->offset),
|
|
sizeof(m_data->offset)
|
|
) < 0) {
|
|
return -1;
|
|
}
|
|
/* update backup L2 table */
|
|
if (extent->l1_backup_table_offset != 0) {
|
|
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
|
|
if (bdrv_pwrite_sync(
|
|
extent->file,
|
|
((int64_t)m_data->l2_offset * 512)
|
|
+ (m_data->l2_index * sizeof(m_data->offset)),
|
|
&(m_data->offset), sizeof(m_data->offset)
|
|
) < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_cluster_offset(BlockDriverState *bs,
|
|
VmdkExtent *extent,
|
|
VmdkMetaData *m_data,
|
|
uint64_t offset,
|
|
int allocate,
|
|
uint64_t *cluster_offset)
|
|
{
|
|
unsigned int l1_index, l2_offset, l2_index;
|
|
int min_index, i, j;
|
|
uint32_t min_count, *l2_table, tmp = 0;
|
|
|
|
if (m_data) {
|
|
m_data->valid = 0;
|
|
}
|
|
if (extent->flat) {
|
|
*cluster_offset = extent->flat_start_offset;
|
|
return 0;
|
|
}
|
|
|
|
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
|
if (l1_index >= extent->l1_size) {
|
|
return -1;
|
|
}
|
|
l2_offset = extent->l1_table[l1_index];
|
|
if (!l2_offset) {
|
|
return -1;
|
|
}
|
|
for (i = 0; i < L2_CACHE_SIZE; i++) {
|
|
if (l2_offset == extent->l2_cache_offsets[i]) {
|
|
/* increment the hit count */
|
|
if (++extent->l2_cache_counts[i] == 0xffffffff) {
|
|
for (j = 0; j < L2_CACHE_SIZE; j++) {
|
|
extent->l2_cache_counts[j] >>= 1;
|
|
}
|
|
}
|
|
l2_table = extent->l2_cache + (i * extent->l2_size);
|
|
goto found;
|
|
}
|
|
}
|
|
/* not found: load a new entry in the least used one */
|
|
min_index = 0;
|
|
min_count = 0xffffffff;
|
|
for (i = 0; i < L2_CACHE_SIZE; i++) {
|
|
if (extent->l2_cache_counts[i] < min_count) {
|
|
min_count = extent->l2_cache_counts[i];
|
|
min_index = i;
|
|
}
|
|
}
|
|
l2_table = extent->l2_cache + (min_index * extent->l2_size);
|
|
if (bdrv_pread(
|
|
extent->file,
|
|
(int64_t)l2_offset * 512,
|
|
l2_table,
|
|
extent->l2_size * sizeof(uint32_t)
|
|
) != extent->l2_size * sizeof(uint32_t)) {
|
|
return -1;
|
|
}
|
|
|
|
extent->l2_cache_offsets[min_index] = l2_offset;
|
|
extent->l2_cache_counts[min_index] = 1;
|
|
found:
|
|
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
|
*cluster_offset = le32_to_cpu(l2_table[l2_index]);
|
|
|
|
if (!*cluster_offset) {
|
|
if (!allocate) {
|
|
return -1;
|
|
}
|
|
|
|
/* Avoid the L2 tables update for the images that have snapshots. */
|
|
*cluster_offset = bdrv_getlength(extent->file);
|
|
bdrv_truncate(
|
|
extent->file,
|
|
*cluster_offset + (extent->cluster_sectors << 9)
|
|
);
|
|
|
|
*cluster_offset >>= 9;
|
|
tmp = cpu_to_le32(*cluster_offset);
|
|
l2_table[l2_index] = tmp;
|
|
|
|
/* First of all we write grain itself, to avoid race condition
|
|
* that may to corrupt the image.
|
|
* This problem may occur because of insufficient space on host disk
|
|
* or inappropriate VM shutdown.
|
|
*/
|
|
if (get_whole_cluster(
|
|
bs, extent, *cluster_offset, offset, allocate) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
if (m_data) {
|
|
m_data->offset = tmp;
|
|
m_data->l1_index = l1_index;
|
|
m_data->l2_index = l2_index;
|
|
m_data->l2_offset = l2_offset;
|
|
m_data->valid = 1;
|
|
}
|
|
}
|
|
*cluster_offset <<= 9;
|
|
return 0;
|
|
}
|
|
|
|
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
|
int64_t sector_num, VmdkExtent *start_hint)
|
|
{
|
|
VmdkExtent *extent = start_hint;
|
|
|
|
if (!extent) {
|
|
extent = &s->extents[0];
|
|
}
|
|
while (extent < &s->extents[s->num_extents]) {
|
|
if (sector_num < extent->end_sector) {
|
|
return extent;
|
|
}
|
|
extent++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, int *pnum)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
int64_t index_in_cluster, n, ret;
|
|
uint64_t offset;
|
|
VmdkExtent *extent;
|
|
|
|
extent = find_extent(s, sector_num, NULL);
|
|
if (!extent) {
|
|
return 0;
|
|
}
|
|
ret = get_cluster_offset(bs, extent, NULL,
|
|
sector_num * 512, 0, &offset);
|
|
/* get_cluster_offset returning 0 means success */
|
|
ret = !ret;
|
|
|
|
index_in_cluster = sector_num % extent->cluster_sectors;
|
|
n = extent->cluster_sectors - index_in_cluster;
|
|
if (n > nb_sectors) {
|
|
n = nb_sectors;
|
|
}
|
|
*pnum = n;
|
|
return ret;
|
|
}
|
|
|
|
static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
int ret;
|
|
uint64_t n, index_in_cluster;
|
|
VmdkExtent *extent = NULL;
|
|
uint64_t cluster_offset;
|
|
|
|
while (nb_sectors > 0) {
|
|
extent = find_extent(s, sector_num, extent);
|
|
if (!extent) {
|
|
return -EIO;
|
|
}
|
|
ret = get_cluster_offset(
|
|
bs, extent, NULL,
|
|
sector_num << 9, 0, &cluster_offset);
|
|
index_in_cluster = sector_num % extent->cluster_sectors;
|
|
n = extent->cluster_sectors - index_in_cluster;
|
|
if (n > nb_sectors) {
|
|
n = nb_sectors;
|
|
}
|
|
if (ret) {
|
|
/* if not allocated, try to read from parent image, if exist */
|
|
if (bs->backing_hd) {
|
|
if (!vmdk_is_cid_valid(bs)) {
|
|
return -EINVAL;
|
|
}
|
|
ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
} else {
|
|
memset(buf, 0, 512 * n);
|
|
}
|
|
} else {
|
|
ret = bdrv_pread(extent->file,
|
|
cluster_offset + index_in_cluster * 512,
|
|
buf, n * 512);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
nb_sectors -= n;
|
|
sector_num += n;
|
|
buf += n * 512;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
VmdkExtent *extent = NULL;
|
|
int n, ret;
|
|
int64_t index_in_cluster;
|
|
uint64_t cluster_offset;
|
|
VmdkMetaData m_data;
|
|
|
|
if (sector_num > bs->total_sectors) {
|
|
fprintf(stderr,
|
|
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
|
" total_sectors=0x%" PRIx64 "\n",
|
|
sector_num, bs->total_sectors);
|
|
return -EIO;
|
|
}
|
|
|
|
while (nb_sectors > 0) {
|
|
extent = find_extent(s, sector_num, extent);
|
|
if (!extent) {
|
|
return -EIO;
|
|
}
|
|
ret = get_cluster_offset(
|
|
bs,
|
|
extent,
|
|
&m_data,
|
|
sector_num << 9, 1,
|
|
&cluster_offset);
|
|
if (ret) {
|
|
return -EINVAL;
|
|
}
|
|
index_in_cluster = sector_num % extent->cluster_sectors;
|
|
n = extent->cluster_sectors - index_in_cluster;
|
|
if (n > nb_sectors) {
|
|
n = nb_sectors;
|
|
}
|
|
|
|
ret = bdrv_pwrite(extent->file,
|
|
cluster_offset + index_in_cluster * 512,
|
|
buf,
|
|
n * 512);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
if (m_data.valid) {
|
|
/* update L2 tables */
|
|
if (vmdk_L2update(extent, &m_data) == -1) {
|
|
return -EIO;
|
|
}
|
|
}
|
|
nb_sectors -= n;
|
|
sector_num += n;
|
|
buf += n * 512;
|
|
|
|
/* update CID on the first write every time the virtual disk is
|
|
* opened */
|
|
if (!s->cid_updated) {
|
|
vmdk_write_cid(bs, time(NULL));
|
|
s->cid_updated = true;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat)
|
|
{
|
|
int ret, i;
|
|
int fd = 0;
|
|
VMDK4Header header;
|
|
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count;
|
|
|
|
fd = open(
|
|
filename,
|
|
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
if (fd < 0) {
|
|
return -errno;
|
|
}
|
|
if (flat) {
|
|
ret = ftruncate(fd, filesize);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
}
|
|
goto exit;
|
|
}
|
|
magic = cpu_to_be32(VMDK4_MAGIC);
|
|
memset(&header, 0, sizeof(header));
|
|
header.version = 1;
|
|
header.flags = 3; /* ?? */
|
|
header.capacity = filesize / 512;
|
|
header.granularity = 128;
|
|
header.num_gtes_per_gte = 512;
|
|
|
|
grains = (filesize / 512 + header.granularity - 1) / header.granularity;
|
|
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9;
|
|
gt_count =
|
|
(grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
|
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9;
|
|
|
|
header.desc_offset = 1;
|
|
header.desc_size = 20;
|
|
header.rgd_offset = header.desc_offset + header.desc_size;
|
|
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count);
|
|
header.grain_offset =
|
|
((header.gd_offset + gd_size + (gt_size * gt_count) +
|
|
header.granularity - 1) / header.granularity) *
|
|
header.granularity;
|
|
/* swap endianness for all header fields */
|
|
header.version = cpu_to_le32(header.version);
|
|
header.flags = cpu_to_le32(header.flags);
|
|
header.capacity = cpu_to_le64(header.capacity);
|
|
header.granularity = cpu_to_le64(header.granularity);
|
|
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte);
|
|
header.desc_offset = cpu_to_le64(header.desc_offset);
|
|
header.desc_size = cpu_to_le64(header.desc_size);
|
|
header.rgd_offset = cpu_to_le64(header.rgd_offset);
|
|
header.gd_offset = cpu_to_le64(header.gd_offset);
|
|
header.grain_offset = cpu_to_le64(header.grain_offset);
|
|
|
|
header.check_bytes[0] = 0xa;
|
|
header.check_bytes[1] = 0x20;
|
|
header.check_bytes[2] = 0xd;
|
|
header.check_bytes[3] = 0xa;
|
|
|
|
/* write all the data */
|
|
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
|
if (ret != sizeof(magic)) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
ret = qemu_write_full(fd, &header, sizeof(header));
|
|
if (ret != sizeof(header)) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
|
|
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
|
|
/* write grain directory */
|
|
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
|
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size;
|
|
i < gt_count; i++, tmp += gt_size) {
|
|
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
|
if (ret != sizeof(tmp)) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/* write backup grain directory */
|
|
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
|
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size;
|
|
i < gt_count; i++, tmp += gt_size) {
|
|
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
|
if (ret != sizeof(tmp)) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
exit:
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int filename_decompose(const char *filename, char *path, char *prefix,
|
|
char *postfix, size_t buf_len)
|
|
{
|
|
const char *p, *q;
|
|
|
|
if (filename == NULL || !strlen(filename)) {
|
|
fprintf(stderr, "Vmdk: no filename provided.\n");
|
|
return -1;
|
|
}
|
|
p = strrchr(filename, '/');
|
|
if (p == NULL) {
|
|
p = strrchr(filename, '\\');
|
|
}
|
|
if (p == NULL) {
|
|
p = strrchr(filename, ':');
|
|
}
|
|
if (p != NULL) {
|
|
p++;
|
|
if (p - filename >= buf_len) {
|
|
return -1;
|
|
}
|
|
pstrcpy(path, p - filename + 1, filename);
|
|
} else {
|
|
p = filename;
|
|
path[0] = '\0';
|
|
}
|
|
q = strrchr(p, '.');
|
|
if (q == NULL) {
|
|
pstrcpy(prefix, buf_len, p);
|
|
postfix[0] = '\0';
|
|
} else {
|
|
if (q - p >= buf_len) {
|
|
return -1;
|
|
}
|
|
pstrcpy(prefix, q - p + 1, p);
|
|
pstrcpy(postfix, buf_len, q);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int relative_path(char *dest, int dest_size,
|
|
const char *base, const char *target)
|
|
{
|
|
int i = 0;
|
|
int n = 0;
|
|
const char *p, *q;
|
|
#ifdef _WIN32
|
|
const char *sep = "\\";
|
|
#else
|
|
const char *sep = "/";
|
|
#endif
|
|
|
|
if (!(dest && base && target)) {
|
|
return -1;
|
|
}
|
|
if (path_is_absolute(target)) {
|
|
dest[dest_size - 1] = '\0';
|
|
strncpy(dest, target, dest_size - 1);
|
|
return 0;
|
|
}
|
|
while (base[i] == target[i]) {
|
|
i++;
|
|
}
|
|
p = &base[i];
|
|
q = &target[i];
|
|
while (*p) {
|
|
if (*p == *sep) {
|
|
n++;
|
|
}
|
|
p++;
|
|
}
|
|
dest[0] = '\0';
|
|
for (; n; n--) {
|
|
pstrcat(dest, dest_size, "..");
|
|
pstrcat(dest, dest_size, sep);
|
|
}
|
|
pstrcat(dest, dest_size, q);
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
int fd, idx = 0;
|
|
char desc[BUF_SIZE];
|
|
int64_t total_size = 0, filesize;
|
|
const char *backing_file = NULL;
|
|
const char *fmt = NULL;
|
|
int flags = 0;
|
|
int ret = 0;
|
|
bool flat, split;
|
|
char ext_desc_lines[BUF_SIZE] = "";
|
|
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
|
|
const int64_t split_size = 0x80000000; /* VMDK has constant split size */
|
|
const char *desc_extent_line;
|
|
char parent_desc_line[BUF_SIZE] = "";
|
|
uint32_t parent_cid = 0xffffffff;
|
|
const char desc_template[] =
|
|
"# Disk DescriptorFile\n"
|
|
"version=1\n"
|
|
"CID=%x\n"
|
|
"parentCID=%x\n"
|
|
"createType=\"%s\"\n"
|
|
"%s"
|
|
"\n"
|
|
"# Extent description\n"
|
|
"%s"
|
|
"\n"
|
|
"# The Disk Data Base\n"
|
|
"#DDB\n"
|
|
"\n"
|
|
"ddb.virtualHWVersion = \"%d\"\n"
|
|
"ddb.geometry.cylinders = \"%" PRId64 "\"\n"
|
|
"ddb.geometry.heads = \"16\"\n"
|
|
"ddb.geometry.sectors = \"63\"\n"
|
|
"ddb.adapterType = \"ide\"\n";
|
|
|
|
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
|
|
return -EINVAL;
|
|
}
|
|
/* Read out options */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
|
total_size = options->value.n;
|
|
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
|
|
backing_file = options->value.s;
|
|
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) {
|
|
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
|
|
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) {
|
|
fmt = options->value.s;
|
|
}
|
|
options++;
|
|
}
|
|
if (!fmt) {
|
|
/* Default format to monolithicSparse */
|
|
fmt = "monolithicSparse";
|
|
} else if (strcmp(fmt, "monolithicFlat") &&
|
|
strcmp(fmt, "monolithicSparse") &&
|
|
strcmp(fmt, "twoGbMaxExtentSparse") &&
|
|
strcmp(fmt, "twoGbMaxExtentFlat")) {
|
|
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
|
|
return -EINVAL;
|
|
}
|
|
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
|
|
strcmp(fmt, "twoGbMaxExtentSparse"));
|
|
flat = !(strcmp(fmt, "monolithicFlat") &&
|
|
strcmp(fmt, "twoGbMaxExtentFlat"));
|
|
if (flat) {
|
|
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
|
} else {
|
|
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
|
}
|
|
if (flat && backing_file) {
|
|
/* not supporting backing file for flat image */
|
|
return -ENOTSUP;
|
|
}
|
|
if (backing_file) {
|
|
char parent_filename[PATH_MAX];
|
|
BlockDriverState *bs = bdrv_new("");
|
|
ret = bdrv_open(bs, backing_file, 0, NULL);
|
|
if (ret != 0) {
|
|
bdrv_delete(bs);
|
|
return ret;
|
|
}
|
|
if (strcmp(bs->drv->format_name, "vmdk")) {
|
|
bdrv_delete(bs);
|
|
return -EINVAL;
|
|
}
|
|
filesize = bdrv_getlength(bs);
|
|
parent_cid = vmdk_read_cid(bs, 0);
|
|
bdrv_delete(bs);
|
|
relative_path(parent_filename, sizeof(parent_filename),
|
|
filename, backing_file);
|
|
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
|
"parentFileNameHint=\"%s\"", parent_filename);
|
|
}
|
|
|
|
/* Create extents */
|
|
filesize = total_size;
|
|
while (filesize > 0) {
|
|
char desc_line[BUF_SIZE];
|
|
char ext_filename[PATH_MAX];
|
|
char desc_filename[PATH_MAX];
|
|
int64_t size = filesize;
|
|
|
|
if (split && size > split_size) {
|
|
size = split_size;
|
|
}
|
|
if (split) {
|
|
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s",
|
|
prefix, flat ? 'f' : 's', ++idx, postfix);
|
|
} else if (flat) {
|
|
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s",
|
|
prefix, postfix);
|
|
} else {
|
|
snprintf(desc_filename, sizeof(desc_filename), "%s%s",
|
|
prefix, postfix);
|
|
}
|
|
snprintf(ext_filename, sizeof(ext_filename), "%s%s",
|
|
path, desc_filename);
|
|
|
|
if (vmdk_create_extent(ext_filename, size, flat)) {
|
|
return -EINVAL;
|
|
}
|
|
filesize -= size;
|
|
|
|
/* Format description line */
|
|
snprintf(desc_line, sizeof(desc_line),
|
|
desc_extent_line, size / 512, desc_filename);
|
|
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
|
}
|
|
/* generate descriptor file */
|
|
snprintf(desc, sizeof(desc), desc_template,
|
|
(unsigned int)time(NULL),
|
|
parent_cid,
|
|
fmt,
|
|
parent_desc_line,
|
|
ext_desc_lines,
|
|
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4),
|
|
total_size / (int64_t)(63 * 16 * 512));
|
|
if (split || flat) {
|
|
fd = open(
|
|
filename,
|
|
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
} else {
|
|
fd = open(
|
|
filename,
|
|
O_WRONLY | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
}
|
|
if (fd < 0) {
|
|
return -errno;
|
|
}
|
|
/* the descriptor offset = 0x200 */
|
|
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
ret = qemu_write_full(fd, desc, strlen(desc));
|
|
if (ret != strlen(desc)) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
ret = 0;
|
|
exit:
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static void vmdk_close(BlockDriverState *bs)
|
|
{
|
|
vmdk_free_extents(bs);
|
|
}
|
|
|
|
static int vmdk_flush(BlockDriverState *bs)
|
|
{
|
|
int i, ret, err;
|
|
BDRVVmdkState *s = bs->opaque;
|
|
|
|
ret = bdrv_flush(bs->file);
|
|
for (i = 0; i < s->num_extents; i++) {
|
|
err = bdrv_flush(s->extents[i].file);
|
|
if (err < 0) {
|
|
ret = err;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
|
|
{
|
|
int i;
|
|
int64_t ret = 0;
|
|
int64_t r;
|
|
BDRVVmdkState *s = bs->opaque;
|
|
|
|
ret = bdrv_get_allocated_file_size(bs->file);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
for (i = 0; i < s->num_extents; i++) {
|
|
if (s->extents[i].file == bs->file) {
|
|
continue;
|
|
}
|
|
r = bdrv_get_allocated_file_size(s->extents[i].file);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
ret += r;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static QEMUOptionParameter vmdk_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_BACKING_FILE,
|
|
.type = OPT_STRING,
|
|
.help = "File name of a base image"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_COMPAT6,
|
|
.type = OPT_FLAG,
|
|
.help = "VMDK version 6 image"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_SUBFMT,
|
|
.type = OPT_STRING,
|
|
.help =
|
|
"VMDK flat extent format, can be one of "
|
|
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat} "
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static BlockDriver bdrv_vmdk = {
|
|
.format_name = "vmdk",
|
|
.instance_size = sizeof(BDRVVmdkState),
|
|
.bdrv_probe = vmdk_probe,
|
|
.bdrv_open = vmdk_open,
|
|
.bdrv_read = vmdk_read,
|
|
.bdrv_write = vmdk_write,
|
|
.bdrv_close = vmdk_close,
|
|
.bdrv_create = vmdk_create,
|
|
.bdrv_flush = vmdk_flush,
|
|
.bdrv_is_allocated = vmdk_is_allocated,
|
|
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
|
|
|
|
.create_options = vmdk_create_options,
|
|
};
|
|
|
|
static void bdrv_vmdk_init(void)
|
|
{
|
|
bdrv_register(&bdrv_vmdk);
|
|
}
|
|
|
|
block_init(bdrv_vmdk_init);
|