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9b8114a8ef
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5567 c046a42c-6fe2-441c-8c8c-71466251a162
836 lines
25 KiB
C
836 lines
25 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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#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 BDRVVmdkState {
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BlockDriverState *hd;
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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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uint32_t parent_cid;
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int is_parent;
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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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typedef struct ActiveBDRVState{
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BlockDriverState *hd; // active image handler
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uint64_t cluster_offset; // current write offset
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}ActiveBDRVState;
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static ActiveBDRVState activeBDRV;
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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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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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return 0;
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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 HEADER_SIZE 512 // first sector of 512 bytes
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static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
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{
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BDRVVmdkState *s = bs->opaque;
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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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/* the descriptor offset = 0x200 */
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if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
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return 0;
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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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if ((p_name = strstr(desc,cid_str)) != 0) {
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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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BDRVVmdkState *s = bs->opaque;
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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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/* the descriptor offset = 0x200 */
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if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
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return -1;
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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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if ((p_name = strstr(desc,"CID")) != 0) {
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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(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
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return -1;
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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 = s->hd->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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#endif
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// CID valid
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return 1;
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}
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static int vmdk_snapshot_create(const char *filename, const char *backing_file)
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{
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int snp_fd, p_fd;
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uint32_t p_cid;
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char *p_name, *gd_buf, *rgd_buf;
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const char *real_filename, *temp_str;
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VMDK4Header header;
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uint32_t gde_entries, gd_size;
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int64_t gd_offset, rgd_offset, capacity, gt_size;
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char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
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static const char desc_template[] =
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"# Disk DescriptorFile\n"
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"version=1\n"
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"CID=%x\n"
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"parentCID=%x\n"
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"createType=\"monolithicSparse\"\n"
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"parentFileNameHint=\"%s\"\n"
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"\n"
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"# Extent description\n"
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"RW %u SPARSE \"%s\"\n"
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"\n"
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"# The Disk Data Base \n"
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"#DDB\n"
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"\n";
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snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
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if (snp_fd < 0)
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return -1;
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p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE);
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if (p_fd < 0) {
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close(snp_fd);
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return -1;
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}
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/* read the header */
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if (lseek(p_fd, 0x0, SEEK_SET) == -1)
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goto fail;
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if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE)
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goto fail;
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/* write the header */
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if (lseek(snp_fd, 0x0, SEEK_SET) == -1)
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goto fail;
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if (write(snp_fd, hdr, HEADER_SIZE) == -1)
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goto fail;
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memset(&header, 0, sizeof(header));
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memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC
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ftruncate(snp_fd, header.grain_offset << 9);
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/* the descriptor offset = 0x200 */
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if (lseek(p_fd, 0x200, SEEK_SET) == -1)
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goto fail;
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if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE)
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goto fail;
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if ((p_name = strstr(p_desc,"CID")) != 0) {
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p_name += sizeof("CID");
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sscanf(p_name,"%x",&p_cid);
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}
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real_filename = filename;
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if ((temp_str = strrchr(real_filename, '\\')) != NULL)
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real_filename = temp_str + 1;
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if ((temp_str = strrchr(real_filename, '/')) != NULL)
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real_filename = temp_str + 1;
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if ((temp_str = strrchr(real_filename, ':')) != NULL)
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real_filename = temp_str + 1;
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snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
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(uint32_t)header.capacity, real_filename);
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/* write the descriptor */
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if (lseek(snp_fd, 0x200, SEEK_SET) == -1)
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goto fail;
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if (write(snp_fd, s_desc, strlen(s_desc)) == -1)
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goto fail;
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gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
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rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
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capacity = header.capacity * SECTOR_SIZE; // Extent size
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/*
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* Each GDE span 32M disk, means:
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* 512 GTE per GT, each GTE points to grain
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*/
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gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE;
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if (!gt_size)
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goto fail;
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gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
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gd_size = gde_entries * sizeof(uint32_t);
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/* write RGD */
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rgd_buf = qemu_malloc(gd_size);
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if (!rgd_buf)
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goto fail;
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if (lseek(p_fd, rgd_offset, SEEK_SET) == -1)
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goto fail_rgd;
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if (read(p_fd, rgd_buf, gd_size) != gd_size)
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goto fail_rgd;
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if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1)
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goto fail_rgd;
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if (write(snp_fd, rgd_buf, gd_size) == -1)
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goto fail_rgd;
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qemu_free(rgd_buf);
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/* write GD */
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gd_buf = qemu_malloc(gd_size);
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if (!gd_buf)
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goto fail_rgd;
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if (lseek(p_fd, gd_offset, SEEK_SET) == -1)
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goto fail_gd;
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if (read(p_fd, gd_buf, gd_size) != gd_size)
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goto fail_gd;
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if (lseek(snp_fd, gd_offset, SEEK_SET) == -1)
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goto fail_gd;
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if (write(snp_fd, gd_buf, gd_size) == -1)
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goto fail_gd;
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qemu_free(gd_buf);
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close(p_fd);
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close(snp_fd);
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return 0;
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fail_gd:
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qemu_free(gd_buf);
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fail_rgd:
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qemu_free(rgd_buf);
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fail:
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close(p_fd);
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close(snp_fd);
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return -1;
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}
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static void vmdk_parent_close(BlockDriverState *bs)
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{
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if (bs->backing_hd)
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bdrv_close(bs->backing_hd);
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}
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static int parent_open = 0;
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static int vmdk_parent_open(BlockDriverState *bs, const char * filename)
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{
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BDRVVmdkState *s = bs->opaque;
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char *p_name;
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char desc[DESC_SIZE];
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char parent_img_name[1024];
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/* the descriptor offset = 0x200 */
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if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
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return -1;
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if ((p_name = strstr(desc,"parentFileNameHint")) != 0) {
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char *end_name;
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struct stat file_buf;
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p_name += sizeof("parentFileNameHint") + 1;
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if ((end_name = strchr(p_name,'\"')) == 0)
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return -1;
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if ((end_name - p_name) > sizeof (s->hd->backing_file) - 1)
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return -1;
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pstrcpy(s->hd->backing_file, end_name - p_name + 1, p_name);
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if (stat(s->hd->backing_file, &file_buf) != 0) {
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path_combine(parent_img_name, sizeof(parent_img_name),
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filename, s->hd->backing_file);
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} else {
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pstrcpy(parent_img_name, sizeof(parent_img_name),
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s->hd->backing_file);
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}
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s->hd->backing_hd = bdrv_new("");
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if (!s->hd->backing_hd) {
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failure:
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bdrv_close(s->hd);
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return -1;
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}
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parent_open = 1;
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if (bdrv_open(s->hd->backing_hd, parent_img_name, BDRV_O_RDONLY) < 0)
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goto failure;
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parent_open = 0;
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}
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|
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return 0;
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}
|
|
|
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static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
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{
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BDRVVmdkState *s = bs->opaque;
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uint32_t magic;
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int l1_size, i, ret;
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|
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if (parent_open)
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// Parent must be opened as RO.
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flags = BDRV_O_RDONLY;
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|
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ret = bdrv_file_open(&s->hd, filename, flags);
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if (ret < 0)
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return ret;
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if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic))
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goto fail;
|
|
|
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magic = be32_to_cpu(magic);
|
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if (magic == VMDK3_MAGIC) {
|
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VMDK3Header header;
|
|
|
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if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
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goto fail;
|
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s->cluster_sectors = le32_to_cpu(header.granularity);
|
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s->l2_size = 1 << 9;
|
|
s->l1_size = 1 << 6;
|
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bs->total_sectors = le32_to_cpu(header.disk_sectors);
|
|
s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
|
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s->l1_backup_table_offset = 0;
|
|
s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
|
|
} else if (magic == VMDK4_MAGIC) {
|
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VMDK4Header header;
|
|
|
|
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
|
|
goto fail;
|
|
bs->total_sectors = le64_to_cpu(header.capacity);
|
|
s->cluster_sectors = le64_to_cpu(header.granularity);
|
|
s->l2_size = le32_to_cpu(header.num_gtes_per_gte);
|
|
s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
|
|
if (s->l1_entry_sectors <= 0)
|
|
goto fail;
|
|
s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
|
|
/ s->l1_entry_sectors;
|
|
s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
|
|
s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
|
|
|
|
if (parent_open)
|
|
s->is_parent = 1;
|
|
else
|
|
s->is_parent = 0;
|
|
|
|
// try to open parent images, if exist
|
|
if (vmdk_parent_open(bs, filename) != 0)
|
|
goto fail;
|
|
// write the CID once after the image creation
|
|
s->parent_cid = vmdk_read_cid(bs,1);
|
|
} else {
|
|
goto fail;
|
|
}
|
|
|
|
/* read the L1 table */
|
|
l1_size = s->l1_size * sizeof(uint32_t);
|
|
s->l1_table = qemu_malloc(l1_size);
|
|
if (!s->l1_table)
|
|
goto fail;
|
|
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
|
|
goto fail;
|
|
for(i = 0; i < s->l1_size; i++) {
|
|
le32_to_cpus(&s->l1_table[i]);
|
|
}
|
|
|
|
if (s->l1_backup_table_offset) {
|
|
s->l1_backup_table = qemu_malloc(l1_size);
|
|
if (!s->l1_backup_table)
|
|
goto fail;
|
|
if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
|
|
goto fail;
|
|
for(i = 0; i < s->l1_size; i++) {
|
|
le32_to_cpus(&s->l1_backup_table[i]);
|
|
}
|
|
}
|
|
|
|
s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
|
if (!s->l2_cache)
|
|
goto fail;
|
|
return 0;
|
|
fail:
|
|
qemu_free(s->l1_backup_table);
|
|
qemu_free(s->l1_table);
|
|
qemu_free(s->l2_cache);
|
|
bdrv_delete(s->hd);
|
|
return -1;
|
|
}
|
|
|
|
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
|
uint64_t offset, int allocate);
|
|
|
|
static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset,
|
|
uint64_t offset, int allocate)
|
|
{
|
|
uint64_t parent_cluster_offset;
|
|
BDRVVmdkState *s = bs->opaque;
|
|
uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB
|
|
|
|
// we will be here if it's first write on non-exist grain(cluster).
|
|
// try to read from parent image, if exist
|
|
if (s->hd->backing_hd) {
|
|
BDRVVmdkState *ps = s->hd->backing_hd->opaque;
|
|
|
|
if (!vmdk_is_cid_valid(bs))
|
|
return -1;
|
|
|
|
parent_cluster_offset = get_cluster_offset(s->hd->backing_hd, NULL, offset, allocate);
|
|
|
|
if (parent_cluster_offset) {
|
|
BDRVVmdkState *act_s = activeBDRV.hd->opaque;
|
|
|
|
if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512)
|
|
return -1;
|
|
|
|
//Write grain only into the active image
|
|
if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain))
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
|
|
/* update L2 table */
|
|
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
|
|
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset))
|
|
return -1;
|
|
/* update backup L2 table */
|
|
if (s->l1_backup_table_offset != 0) {
|
|
m_data->l2_offset = s->l1_backup_table[m_data->l1_index];
|
|
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
|
|
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset))
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
|
uint64_t offset, int allocate)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
unsigned int l1_index, l2_offset, l2_index;
|
|
int min_index, i, j;
|
|
uint32_t min_count, *l2_table, tmp = 0;
|
|
uint64_t cluster_offset;
|
|
|
|
if (m_data)
|
|
m_data->valid = 0;
|
|
|
|
l1_index = (offset >> 9) / s->l1_entry_sectors;
|
|
if (l1_index >= s->l1_size)
|
|
return 0;
|
|
l2_offset = s->l1_table[l1_index];
|
|
if (!l2_offset)
|
|
return 0;
|
|
for(i = 0; i < L2_CACHE_SIZE; i++) {
|
|
if (l2_offset == s->l2_cache_offsets[i]) {
|
|
/* increment the hit count */
|
|
if (++s->l2_cache_counts[i] == 0xffffffff) {
|
|
for(j = 0; j < L2_CACHE_SIZE; j++) {
|
|
s->l2_cache_counts[j] >>= 1;
|
|
}
|
|
}
|
|
l2_table = s->l2_cache + (i * s->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 (s->l2_cache_counts[i] < min_count) {
|
|
min_count = s->l2_cache_counts[i];
|
|
min_index = i;
|
|
}
|
|
}
|
|
l2_table = s->l2_cache + (min_index * s->l2_size);
|
|
if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) !=
|
|
s->l2_size * sizeof(uint32_t))
|
|
return 0;
|
|
|
|
s->l2_cache_offsets[min_index] = l2_offset;
|
|
s->l2_cache_counts[min_index] = 1;
|
|
found:
|
|
l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
|
|
cluster_offset = le32_to_cpu(l2_table[l2_index]);
|
|
|
|
if (!cluster_offset) {
|
|
if (!allocate)
|
|
return 0;
|
|
// Avoid the L2 tables update for the images that have snapshots.
|
|
if (!s->is_parent) {
|
|
cluster_offset = bdrv_getlength(s->hd);
|
|
bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9));
|
|
|
|
cluster_offset >>= 9;
|
|
tmp = cpu_to_le32(cluster_offset);
|
|
l2_table[l2_index] = tmp;
|
|
// Save the active image state
|
|
activeBDRV.cluster_offset = cluster_offset;
|
|
activeBDRV.hd = bs;
|
|
}
|
|
/* 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, cluster_offset, offset, allocate) == -1)
|
|
return 0;
|
|
|
|
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 cluster_offset;
|
|
}
|
|
|
|
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, int *pnum)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
int index_in_cluster, n;
|
|
uint64_t cluster_offset;
|
|
|
|
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0);
|
|
index_in_cluster = sector_num % s->cluster_sectors;
|
|
n = s->cluster_sectors - index_in_cluster;
|
|
if (n > nb_sectors)
|
|
n = nb_sectors;
|
|
*pnum = n;
|
|
return (cluster_offset != 0);
|
|
}
|
|
|
|
static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
int index_in_cluster, n, ret;
|
|
uint64_t cluster_offset;
|
|
|
|
while (nb_sectors > 0) {
|
|
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0);
|
|
index_in_cluster = sector_num % s->cluster_sectors;
|
|
n = s->cluster_sectors - index_in_cluster;
|
|
if (n > nb_sectors)
|
|
n = nb_sectors;
|
|
if (!cluster_offset) {
|
|
// try to read from parent image, if exist
|
|
if (s->hd->backing_hd) {
|
|
if (!vmdk_is_cid_valid(bs))
|
|
return -1;
|
|
ret = bdrv_read(s->hd->backing_hd, sector_num, buf, n);
|
|
if (ret < 0)
|
|
return -1;
|
|
} else {
|
|
memset(buf, 0, 512 * n);
|
|
}
|
|
} else {
|
|
if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
|
|
return -1;
|
|
}
|
|
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;
|
|
VmdkMetaData m_data;
|
|
int index_in_cluster, n;
|
|
uint64_t cluster_offset;
|
|
static int cid_update = 0;
|
|
|
|
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 -1;
|
|
}
|
|
|
|
while (nb_sectors > 0) {
|
|
index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
|
n = s->cluster_sectors - index_in_cluster;
|
|
if (n > nb_sectors)
|
|
n = nb_sectors;
|
|
cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1);
|
|
if (!cluster_offset)
|
|
return -1;
|
|
|
|
if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
|
|
return -1;
|
|
if (m_data.valid) {
|
|
/* update L2 tables */
|
|
if (vmdk_L2update(bs, &m_data) == -1)
|
|
return -1;
|
|
}
|
|
nb_sectors -= n;
|
|
sector_num += n;
|
|
buf += n * 512;
|
|
|
|
// update CID on the first write every time the virtual disk is opened
|
|
if (!cid_update) {
|
|
vmdk_write_cid(bs, time(NULL));
|
|
cid_update++;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vmdk_create(const char *filename, int64_t total_size,
|
|
const char *backing_file, int flags)
|
|
{
|
|
int fd, i;
|
|
VMDK4Header header;
|
|
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count;
|
|
static const char desc_template[] =
|
|
"# Disk DescriptorFile\n"
|
|
"version=1\n"
|
|
"CID=%x\n"
|
|
"parentCID=ffffffff\n"
|
|
"createType=\"monolithicSparse\"\n"
|
|
"\n"
|
|
"# Extent description\n"
|
|
"RW %" PRId64 " SPARSE \"%s\"\n"
|
|
"\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";
|
|
char desc[1024];
|
|
const char *real_filename, *temp_str;
|
|
|
|
/* XXX: add support for backing file */
|
|
if (backing_file) {
|
|
return vmdk_snapshot_create(filename, backing_file);
|
|
}
|
|
|
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
if (fd < 0)
|
|
return -1;
|
|
magic = cpu_to_be32(VMDK4_MAGIC);
|
|
memset(&header, 0, sizeof(header));
|
|
header.version = cpu_to_le32(1);
|
|
header.flags = cpu_to_le32(3); /* ?? */
|
|
header.capacity = cpu_to_le64(total_size);
|
|
header.granularity = cpu_to_le64(128);
|
|
header.num_gtes_per_gte = cpu_to_le32(512);
|
|
|
|
grains = (total_size + 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;
|
|
|
|
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 */
|
|
write(fd, &magic, sizeof(magic));
|
|
write(fd, &header, sizeof(header));
|
|
|
|
ftruncate(fd, header.grain_offset << 9);
|
|
|
|
/* write grain directory */
|
|
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
|
for (i = 0, tmp = header.rgd_offset + gd_size;
|
|
i < gt_count; i++, tmp += gt_size)
|
|
write(fd, &tmp, sizeof(tmp));
|
|
|
|
/* write backup grain directory */
|
|
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
|
for (i = 0, tmp = header.gd_offset + gd_size;
|
|
i < gt_count; i++, tmp += gt_size)
|
|
write(fd, &tmp, sizeof(tmp));
|
|
|
|
/* compose the descriptor */
|
|
real_filename = filename;
|
|
if ((temp_str = strrchr(real_filename, '\\')) != NULL)
|
|
real_filename = temp_str + 1;
|
|
if ((temp_str = strrchr(real_filename, '/')) != NULL)
|
|
real_filename = temp_str + 1;
|
|
if ((temp_str = strrchr(real_filename, ':')) != NULL)
|
|
real_filename = temp_str + 1;
|
|
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL),
|
|
total_size, real_filename,
|
|
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4),
|
|
total_size / (int64_t)(63 * 16));
|
|
|
|
/* write the descriptor */
|
|
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
|
write(fd, desc, strlen(desc));
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
static void vmdk_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
|
|
qemu_free(s->l1_table);
|
|
qemu_free(s->l2_cache);
|
|
// try to close parent image, if exist
|
|
vmdk_parent_close(s->hd);
|
|
bdrv_delete(s->hd);
|
|
}
|
|
|
|
static void vmdk_flush(BlockDriverState *bs)
|
|
{
|
|
BDRVVmdkState *s = bs->opaque;
|
|
bdrv_flush(s->hd);
|
|
}
|
|
|
|
BlockDriver bdrv_vmdk = {
|
|
"vmdk",
|
|
sizeof(BDRVVmdkState),
|
|
vmdk_probe,
|
|
vmdk_open,
|
|
vmdk_read,
|
|
vmdk_write,
|
|
vmdk_close,
|
|
vmdk_create,
|
|
vmdk_flush,
|
|
vmdk_is_allocated,
|
|
};
|