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/*
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* Block driver for the VMDK format
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*
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* Copyright (c) 2004 Fabrice Bellard
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* Copyright (c) 2005 Filip Navara
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h" |
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#include "block_int.h" |
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|
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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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|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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uint32_t disk_sectors; |
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uint32_t granularity; |
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uint32_t l1dir_offset; |
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uint32_t l1dir_size; |
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uint32_t file_sectors; |
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uint32_t cylinders; |
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uint32_t heads; |
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uint32_t sectors_per_track; |
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} VMDK3Header; |
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|
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typedef struct { |
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uint32_t version; |
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uint32_t flags; |
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int64_t capacity; |
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int64_t granularity; |
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int64_t desc_offset; |
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int64_t desc_size; |
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int32_t num_gtes_per_gte; |
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int64_t 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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|
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#define L2_CACHE_SIZE 16 |
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|
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typedef struct BDRVVmdkState { |
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int fd;
|
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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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|
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unsigned int l2_size; |
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uint32_t *l2_cache; |
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uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
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uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
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|
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unsigned int cluster_sectors; |
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} BDRVVmdkState; |
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|
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static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) |
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{ |
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uint32_t magic; |
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|
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if (buf_size < 4) |
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return 0; |
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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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|
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static int vmdk_open(BlockDriverState *bs, const char *filename) |
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{ |
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BDRVVmdkState *s = bs->opaque; |
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int fd, i;
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uint32_t magic; |
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int l1_size;
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|
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fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); |
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if (fd < 0) { |
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fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
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if (fd < 0) |
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return -1; |
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bs->read_only = 1;
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} |
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if (read(fd, &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 (read(fd, &header, sizeof(header)) != |
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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; |
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s->l1_size = 1 << 6; |
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bs->total_sectors = le32_to_cpu(header.disk_sectors); |
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s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
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s->l1_backup_table_offset = 0;
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s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
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} else if (magic == VMDK4_MAGIC) { |
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VMDK4Header header; |
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|
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if (read(fd, &header, sizeof(header)) != sizeof(header)) |
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goto fail;
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bs->total_sectors = le32_to_cpu(header.capacity); |
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s->cluster_sectors = le32_to_cpu(header.granularity); |
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s->l2_size = le32_to_cpu(header.num_gtes_per_gte); |
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s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
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if (s->l1_entry_sectors <= 0) |
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goto fail;
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s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
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/ s->l1_entry_sectors; |
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s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
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s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
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} else {
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goto fail;
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} |
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/* read the L1 table */
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l1_size = s->l1_size * sizeof(uint32_t);
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s->l1_table = qemu_malloc(l1_size); |
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if (!s->l1_table)
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goto fail;
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if (lseek(fd, s->l1_table_offset, SEEK_SET) == -1) |
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goto fail;
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if (read(fd, s->l1_table, l1_size) != l1_size)
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goto fail;
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for(i = 0; i < s->l1_size; i++) { |
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le32_to_cpus(&s->l1_table[i]); |
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} |
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|
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if (s->l1_backup_table_offset) {
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s->l1_backup_table = qemu_malloc(l1_size); |
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if (!s->l1_backup_table)
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goto fail;
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if (lseek(fd, s->l1_backup_table_offset, SEEK_SET) == -1) |
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goto fail;
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if (read(fd, s->l1_backup_table, l1_size) != l1_size)
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goto fail;
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for(i = 0; i < s->l1_size; i++) { |
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le32_to_cpus(&s->l1_backup_table[i]); |
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} |
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} |
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s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
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if (!s->l2_cache)
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goto fail;
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s->fd = fd; |
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return 0; |
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fail:
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qemu_free(s->l1_backup_table); |
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qemu_free(s->l1_table); |
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qemu_free(s->l2_cache); |
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close(fd); |
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return -1; |
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} |
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static uint64_t get_cluster_offset(BlockDriverState *bs,
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uint64_t offset, int allocate)
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{ |
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BDRVVmdkState *s = bs->opaque; |
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unsigned int l1_index, l2_offset, l2_index; |
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int min_index, i, j;
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uint32_t min_count, *l2_table, tmp; |
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uint64_t cluster_offset; |
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l1_index = (offset >> 9) / s->l1_entry_sectors;
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if (l1_index >= s->l1_size)
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return 0; |
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l2_offset = s->l1_table[l1_index]; |
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if (!l2_offset)
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return 0; |
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for(i = 0; i < L2_CACHE_SIZE; i++) { |
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if (l2_offset == s->l2_cache_offsets[i]) {
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/* increment the hit count */
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if (++s->l2_cache_counts[i] == 0xffffffff) { |
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for(j = 0; j < L2_CACHE_SIZE; j++) { |
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s->l2_cache_counts[j] >>= 1;
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} |
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} |
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l2_table = s->l2_cache + (i * s->l2_size); |
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goto found;
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} |
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} |
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/* not found: load a new entry in the least used one */
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min_index = 0;
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min_count = 0xffffffff;
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for(i = 0; i < L2_CACHE_SIZE; i++) { |
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if (s->l2_cache_counts[i] < min_count) {
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min_count = s->l2_cache_counts[i]; |
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min_index = i; |
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} |
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} |
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l2_table = s->l2_cache + (min_index * s->l2_size); |
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lseek(s->fd, (int64_t)l2_offset * 512, SEEK_SET);
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if (read(s->fd, l2_table, s->l2_size * sizeof(uint32_t)) != |
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s->l2_size * sizeof(uint32_t))
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return 0; |
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s->l2_cache_offsets[min_index] = l2_offset; |
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s->l2_cache_counts[min_index] = 1;
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found:
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l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
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cluster_offset = le32_to_cpu(l2_table[l2_index]); |
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if (!cluster_offset) {
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if (!allocate)
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return 0; |
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cluster_offset = lseek(s->fd, 0, SEEK_END);
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ftruncate(s->fd, cluster_offset + (s->cluster_sectors << 9));
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cluster_offset >>= 9;
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/* update L2 table */
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tmp = cpu_to_le32(cluster_offset); |
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l2_table[l2_index] = tmp; |
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lseek(s->fd, ((int64_t)l2_offset * 512) + (l2_index * sizeof(tmp)), SEEK_SET); |
234 |
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp)) |
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return 0; |
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/* update backup L2 table */
|
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if (s->l1_backup_table_offset != 0) { |
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l2_offset = s->l1_backup_table[l1_index]; |
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lseek(s->fd, ((int64_t)l2_offset * 512) + (l2_index * sizeof(tmp)), SEEK_SET); |
240 |
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp)) |
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return 0; |
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} |
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} |
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cluster_offset <<= 9;
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return cluster_offset;
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} |
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|
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static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
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int nb_sectors, int *pnum) |
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{ |
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BDRVVmdkState *s = bs->opaque; |
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int index_in_cluster, n;
|
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uint64_t cluster_offset; |
254 |
|
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cluster_offset = get_cluster_offset(bs, sector_num << 9, 0); |
256 |
index_in_cluster = sector_num % s->cluster_sectors; |
257 |
n = s->cluster_sectors - index_in_cluster; |
258 |
if (n > nb_sectors)
|
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n = nb_sectors; |
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*pnum = n; |
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return (cluster_offset != 0); |
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} |
263 |
|
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static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
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uint8_t *buf, int nb_sectors)
|
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{ |
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BDRVVmdkState *s = bs->opaque; |
268 |
int ret, index_in_cluster, n;
|
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uint64_t cluster_offset; |
270 |
|
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while (nb_sectors > 0) { |
272 |
cluster_offset = get_cluster_offset(bs, sector_num << 9, 0); |
273 |
index_in_cluster = sector_num % s->cluster_sectors; |
274 |
n = s->cluster_sectors - index_in_cluster; |
275 |
if (n > nb_sectors)
|
276 |
n = nb_sectors; |
277 |
if (!cluster_offset) {
|
278 |
memset(buf, 0, 512 * n); |
279 |
} else {
|
280 |
lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
|
281 |
ret = read(s->fd, buf, n * 512);
|
282 |
if (ret != n * 512) |
283 |
return -1; |
284 |
} |
285 |
nb_sectors -= n; |
286 |
sector_num += n; |
287 |
buf += n * 512;
|
288 |
} |
289 |
return 0; |
290 |
} |
291 |
|
292 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
293 |
const uint8_t *buf, int nb_sectors) |
294 |
{ |
295 |
BDRVVmdkState *s = bs->opaque; |
296 |
int ret, index_in_cluster, n;
|
297 |
uint64_t cluster_offset; |
298 |
|
299 |
while (nb_sectors > 0) { |
300 |
index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
301 |
n = s->cluster_sectors - index_in_cluster; |
302 |
if (n > nb_sectors)
|
303 |
n = nb_sectors; |
304 |
cluster_offset = get_cluster_offset(bs, sector_num << 9, 1); |
305 |
if (!cluster_offset)
|
306 |
return -1; |
307 |
lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
|
308 |
ret = write(s->fd, buf, n * 512);
|
309 |
if (ret != n * 512) |
310 |
return -1; |
311 |
nb_sectors -= n; |
312 |
sector_num += n; |
313 |
buf += n * 512;
|
314 |
} |
315 |
return 0; |
316 |
} |
317 |
|
318 |
static int vmdk_create(const char *filename, int64_t total_size, |
319 |
const char *backing_file, int flags) |
320 |
{ |
321 |
int fd, i;
|
322 |
VMDK4Header header; |
323 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
324 |
char *desc_template =
|
325 |
"# Disk DescriptorFile\n"
|
326 |
"version=1\n"
|
327 |
"CID=%x\n"
|
328 |
"parentCID=ffffffff\n"
|
329 |
"createType=\"monolithicSparse\"\n"
|
330 |
"\n"
|
331 |
"# Extent description\n"
|
332 |
"RW %lu SPARSE \"%s\"\n"
|
333 |
"\n"
|
334 |
"# The Disk Data Base \n"
|
335 |
"#DDB\n"
|
336 |
"\n"
|
337 |
"ddb.virtualHWVersion = \"3\"\n"
|
338 |
"ddb.geometry.cylinders = \"%lu\"\n"
|
339 |
"ddb.geometry.heads = \"16\"\n"
|
340 |
"ddb.geometry.sectors = \"63\"\n"
|
341 |
"ddb.adapterType = \"ide\"\n";
|
342 |
char desc[1024]; |
343 |
const char *real_filename, *temp_str; |
344 |
|
345 |
/* XXX: add support for backing file */
|
346 |
|
347 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
348 |
0644);
|
349 |
if (fd < 0) |
350 |
return -1; |
351 |
magic = cpu_to_be32(VMDK4_MAGIC); |
352 |
memset(&header, 0, sizeof(header)); |
353 |
header.version = cpu_to_le32(1);
|
354 |
header.flags = cpu_to_le32(3); /* ?? */ |
355 |
header.capacity = cpu_to_le64(total_size); |
356 |
header.granularity = cpu_to_le64(128);
|
357 |
header.num_gtes_per_gte = cpu_to_le32(512);
|
358 |
|
359 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
360 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
361 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
362 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
363 |
|
364 |
header.desc_offset = 1;
|
365 |
header.desc_size = 20;
|
366 |
header.rgd_offset = header.desc_offset + header.desc_size; |
367 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
368 |
header.grain_offset = |
369 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
370 |
header.granularity - 1) / header.granularity) *
|
371 |
header.granularity; |
372 |
|
373 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
374 |
header.desc_size = cpu_to_le64(header.desc_size); |
375 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
376 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
377 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
378 |
|
379 |
header.check_bytes[0] = 0xa; |
380 |
header.check_bytes[1] = 0x20; |
381 |
header.check_bytes[2] = 0xd; |
382 |
header.check_bytes[3] = 0xa; |
383 |
|
384 |
/* write all the data */
|
385 |
write(fd, &magic, sizeof(magic));
|
386 |
write(fd, &header, sizeof(header));
|
387 |
|
388 |
ftruncate(fd, header.grain_offset << 9);
|
389 |
|
390 |
/* write grain directory */
|
391 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
392 |
for (i = 0, tmp = header.rgd_offset + gd_size; |
393 |
i < gt_count; i++, tmp += gt_size) |
394 |
write(fd, &tmp, sizeof(tmp));
|
395 |
|
396 |
/* write backup grain directory */
|
397 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
398 |
for (i = 0, tmp = header.gd_offset + gd_size; |
399 |
i < gt_count; i++, tmp += gt_size) |
400 |
write(fd, &tmp, sizeof(tmp));
|
401 |
|
402 |
/* compose the descriptor */
|
403 |
real_filename = filename; |
404 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
405 |
real_filename = temp_str + 1;
|
406 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
407 |
real_filename = temp_str + 1;
|
408 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
409 |
real_filename = temp_str + 1;
|
410 |
sprintf(desc, desc_template, time(NULL), (unsigned long)total_size, |
411 |
real_filename, total_size / (63 * 16)); |
412 |
|
413 |
/* write the descriptor */
|
414 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
415 |
write(fd, desc, strlen(desc)); |
416 |
|
417 |
close(fd); |
418 |
return 0; |
419 |
} |
420 |
|
421 |
static void vmdk_close(BlockDriverState *bs) |
422 |
{ |
423 |
BDRVVmdkState *s = bs->opaque; |
424 |
qemu_free(s->l1_table); |
425 |
qemu_free(s->l2_cache); |
426 |
close(s->fd); |
427 |
} |
428 |
|
429 |
BlockDriver bdrv_vmdk = { |
430 |
"vmdk",
|
431 |
sizeof(BDRVVmdkState),
|
432 |
vmdk_probe, |
433 |
vmdk_open, |
434 |
vmdk_read, |
435 |
vmdk_write, |
436 |
vmdk_close, |
437 |
vmdk_create, |
438 |
vmdk_is_allocated, |
439 |
}; |