859 lines
27 KiB
C
859 lines
27 KiB
C
/*
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* Block driver for the Virtual Disk Image (VDI) format
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*
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* Copyright (c) 2009, 2012 Stefan Weil
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) version 3 or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Reference:
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* http://forums.virtualbox.org/viewtopic.php?t=8046
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*
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* This driver supports create / read / write operations on VDI images.
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*
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* Todo (see also TODO in code):
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*
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* Some features like snapshots are still missing.
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*
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* Deallocation of zero-filled blocks and shrinking images are missing, too
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* (might be added to common block layer).
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*
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* Allocation of blocks could be optimized (less writes to block map and
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* header).
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*
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* Read and write of adjacent blocks could be done in one operation
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* (current code uses one operation per block (1 MiB).
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*
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* The code is not thread safe (missing locks for changes in header and
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* block table, no problem with current QEMU).
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*
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* Hints:
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*
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* Blocks (VDI documentation) correspond to clusters (QEMU).
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* QEMU's backing files could be implemented using VDI snapshot files (TODO).
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* VDI snapshot files may also contain the complete machine state.
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* Maybe this machine state can be converted to QEMU PC machine snapshot data.
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*
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* The driver keeps a block cache (little endian entries) in memory.
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* For the standard block size (1 MiB), a 1 TiB disk will use 4 MiB RAM,
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* so this seems to be reasonable.
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*/
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#include "qemu-common.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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#include "migration/migration.h"
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#if defined(CONFIG_UUID)
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#include <uuid/uuid.h>
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#else
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/* TODO: move uuid emulation to some central place in QEMU. */
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#include "sysemu/sysemu.h" /* UUID_FMT */
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typedef unsigned char uuid_t[16];
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#endif
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/* Code configuration options. */
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/* Enable debug messages. */
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//~ #define CONFIG_VDI_DEBUG
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/* Support write operations on VDI images. */
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#define CONFIG_VDI_WRITE
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/* Support non-standard block (cluster) size. This is untested.
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* Maybe it will be needed for very large images.
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*/
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//~ #define CONFIG_VDI_BLOCK_SIZE
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/* Support static (fixed, pre-allocated) images. */
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#define CONFIG_VDI_STATIC_IMAGE
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/* Command line option for static images. */
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#define BLOCK_OPT_STATIC "static"
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#define KiB 1024
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#define MiB (KiB * KiB)
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#define SECTOR_SIZE 512
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#define DEFAULT_CLUSTER_SIZE (1 * MiB)
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#if defined(CONFIG_VDI_DEBUG)
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#define logout(fmt, ...) \
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fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__)
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#else
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#define logout(fmt, ...) ((void)0)
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#endif
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/* Image signature. */
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#define VDI_SIGNATURE 0xbeda107f
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/* Image version. */
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#define VDI_VERSION_1_1 0x00010001
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/* Image type. */
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#define VDI_TYPE_DYNAMIC 1
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#define VDI_TYPE_STATIC 2
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/* Innotek / SUN images use these strings in header.text:
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* "<<< innotek VirtualBox Disk Image >>>\n"
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* "<<< Sun xVM VirtualBox Disk Image >>>\n"
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* "<<< Sun VirtualBox Disk Image >>>\n"
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* The value does not matter, so QEMU created images use a different text.
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*/
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#define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n"
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/* A never-allocated block; semantically arbitrary content. */
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#define VDI_UNALLOCATED 0xffffffffU
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/* A discarded (no longer allocated) block; semantically zero-filled. */
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#define VDI_DISCARDED 0xfffffffeU
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#define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED)
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/* max blocks in image is (0xffffffff / 4) */
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#define VDI_BLOCKS_IN_IMAGE_MAX 0x3fffffff
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#define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \
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(uint64_t)DEFAULT_CLUSTER_SIZE)
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#if !defined(CONFIG_UUID)
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static inline void uuid_generate(uuid_t out)
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{
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memset(out, 0, sizeof(uuid_t));
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}
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static inline int uuid_is_null(const uuid_t uu)
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{
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uuid_t null_uuid = { 0 };
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return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0;
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}
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static inline void uuid_unparse(const uuid_t uu, char *out)
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{
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snprintf(out, 37, UUID_FMT,
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uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
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uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
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}
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#endif
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typedef struct {
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char text[0x40];
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uint32_t signature;
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uint32_t version;
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uint32_t header_size;
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uint32_t image_type;
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uint32_t image_flags;
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char description[256];
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uint32_t offset_bmap;
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uint32_t offset_data;
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uint32_t cylinders; /* disk geometry, unused here */
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uint32_t heads; /* disk geometry, unused here */
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uint32_t sectors; /* disk geometry, unused here */
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uint32_t sector_size;
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uint32_t unused1;
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uint64_t disk_size;
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uint32_t block_size;
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uint32_t block_extra; /* unused here */
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uint32_t blocks_in_image;
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uint32_t blocks_allocated;
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uuid_t uuid_image;
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uuid_t uuid_last_snap;
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uuid_t uuid_link;
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uuid_t uuid_parent;
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uint64_t unused2[7];
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} QEMU_PACKED VdiHeader;
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typedef struct {
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/* The block map entries are little endian (even in memory). */
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uint32_t *bmap;
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/* Size of block (bytes). */
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uint32_t block_size;
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/* Size of block (sectors). */
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uint32_t block_sectors;
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/* First sector of block map. */
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uint32_t bmap_sector;
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/* VDI header (converted to host endianness). */
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VdiHeader header;
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Error *migration_blocker;
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} BDRVVdiState;
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/* Change UUID from little endian (IPRT = VirtualBox format) to big endian
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* format (network byte order, standard, see RFC 4122) and vice versa.
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*/
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static void uuid_convert(uuid_t uuid)
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{
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bswap32s((uint32_t *)&uuid[0]);
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bswap16s((uint16_t *)&uuid[4]);
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bswap16s((uint16_t *)&uuid[6]);
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}
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static void vdi_header_to_cpu(VdiHeader *header)
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{
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le32_to_cpus(&header->signature);
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le32_to_cpus(&header->version);
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le32_to_cpus(&header->header_size);
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le32_to_cpus(&header->image_type);
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le32_to_cpus(&header->image_flags);
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le32_to_cpus(&header->offset_bmap);
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le32_to_cpus(&header->offset_data);
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le32_to_cpus(&header->cylinders);
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le32_to_cpus(&header->heads);
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le32_to_cpus(&header->sectors);
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le32_to_cpus(&header->sector_size);
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le64_to_cpus(&header->disk_size);
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le32_to_cpus(&header->block_size);
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le32_to_cpus(&header->block_extra);
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le32_to_cpus(&header->blocks_in_image);
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le32_to_cpus(&header->blocks_allocated);
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uuid_convert(header->uuid_image);
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uuid_convert(header->uuid_last_snap);
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uuid_convert(header->uuid_link);
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uuid_convert(header->uuid_parent);
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}
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static void vdi_header_to_le(VdiHeader *header)
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{
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cpu_to_le32s(&header->signature);
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cpu_to_le32s(&header->version);
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cpu_to_le32s(&header->header_size);
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cpu_to_le32s(&header->image_type);
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cpu_to_le32s(&header->image_flags);
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cpu_to_le32s(&header->offset_bmap);
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cpu_to_le32s(&header->offset_data);
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cpu_to_le32s(&header->cylinders);
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cpu_to_le32s(&header->heads);
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cpu_to_le32s(&header->sectors);
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cpu_to_le32s(&header->sector_size);
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cpu_to_le64s(&header->disk_size);
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cpu_to_le32s(&header->block_size);
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cpu_to_le32s(&header->block_extra);
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cpu_to_le32s(&header->blocks_in_image);
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cpu_to_le32s(&header->blocks_allocated);
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uuid_convert(header->uuid_image);
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uuid_convert(header->uuid_last_snap);
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uuid_convert(header->uuid_link);
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uuid_convert(header->uuid_parent);
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}
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#if defined(CONFIG_VDI_DEBUG)
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static void vdi_header_print(VdiHeader *header)
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{
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char uuid[37];
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logout("text %s", header->text);
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logout("signature 0x%08x\n", header->signature);
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logout("header size 0x%04x\n", header->header_size);
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logout("image type 0x%04x\n", header->image_type);
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logout("image flags 0x%04x\n", header->image_flags);
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logout("description %s\n", header->description);
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logout("offset bmap 0x%04x\n", header->offset_bmap);
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logout("offset data 0x%04x\n", header->offset_data);
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logout("cylinders 0x%04x\n", header->cylinders);
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logout("heads 0x%04x\n", header->heads);
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logout("sectors 0x%04x\n", header->sectors);
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logout("sector size 0x%04x\n", header->sector_size);
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logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n",
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header->disk_size, header->disk_size / MiB);
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logout("block size 0x%04x\n", header->block_size);
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logout("block extra 0x%04x\n", header->block_extra);
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logout("blocks tot. 0x%04x\n", header->blocks_in_image);
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logout("blocks all. 0x%04x\n", header->blocks_allocated);
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uuid_unparse(header->uuid_image, uuid);
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logout("uuid image %s\n", uuid);
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uuid_unparse(header->uuid_last_snap, uuid);
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logout("uuid snap %s\n", uuid);
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uuid_unparse(header->uuid_link, uuid);
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logout("uuid link %s\n", uuid);
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uuid_unparse(header->uuid_parent, uuid);
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logout("uuid parent %s\n", uuid);
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}
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#endif
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static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res,
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BdrvCheckMode fix)
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{
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/* TODO: additional checks possible. */
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BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
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uint32_t blocks_allocated = 0;
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uint32_t block;
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uint32_t *bmap;
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logout("\n");
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if (fix) {
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return -ENOTSUP;
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}
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bmap = g_malloc(s->header.blocks_in_image * sizeof(uint32_t));
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memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t));
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/* Check block map and value of blocks_allocated. */
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for (block = 0; block < s->header.blocks_in_image; block++) {
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uint32_t bmap_entry = le32_to_cpu(s->bmap[block]);
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if (VDI_IS_ALLOCATED(bmap_entry)) {
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if (bmap_entry < s->header.blocks_in_image) {
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blocks_allocated++;
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if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) {
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bmap[bmap_entry] = bmap_entry;
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} else {
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fprintf(stderr, "ERROR: block index %" PRIu32
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" also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry);
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res->corruptions++;
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}
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} else {
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fprintf(stderr, "ERROR: block index %" PRIu32
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" too large, is %" PRIu32 "\n", block, bmap_entry);
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res->corruptions++;
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}
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}
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}
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if (blocks_allocated != s->header.blocks_allocated) {
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fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32
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", should be %" PRIu32 "\n",
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blocks_allocated, s->header.blocks_allocated);
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res->corruptions++;
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}
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g_free(bmap);
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return 0;
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}
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static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
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{
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/* TODO: vdi_get_info would be needed for machine snapshots.
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vm_state_offset is still missing. */
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BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
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logout("\n");
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bdi->cluster_size = s->block_size;
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bdi->vm_state_offset = 0;
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bdi->unallocated_blocks_are_zero = true;
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return 0;
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}
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static int vdi_make_empty(BlockDriverState *bs)
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{
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/* TODO: missing code. */
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logout("\n");
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/* The return value for missing code must be 0, see block.c. */
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return 0;
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}
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static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
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{
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const VdiHeader *header = (const VdiHeader *)buf;
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int result = 0;
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logout("\n");
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if (buf_size < sizeof(*header)) {
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/* Header too small, no VDI. */
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} else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
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result = 100;
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}
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if (result == 0) {
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logout("no vdi image\n");
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} else {
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logout("%s", header->text);
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}
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return result;
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}
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static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVVdiState *s = bs->opaque;
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VdiHeader header;
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size_t bmap_size;
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int ret;
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logout("\n");
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ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1);
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if (ret < 0) {
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goto fail;
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}
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vdi_header_to_cpu(&header);
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#if defined(CONFIG_VDI_DEBUG)
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vdi_header_print(&header);
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#endif
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if (header.disk_size > VDI_DISK_SIZE_MAX) {
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error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
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", max supported is 0x%" PRIx64 ")",
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header.disk_size, VDI_DISK_SIZE_MAX);
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ret = -ENOTSUP;
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goto fail;
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}
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if (header.disk_size % SECTOR_SIZE != 0) {
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/* 'VBoxManage convertfromraw' can create images with odd disk sizes.
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We accept them but round the disk size to the next multiple of
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SECTOR_SIZE. */
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logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size);
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header.disk_size += SECTOR_SIZE - 1;
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header.disk_size &= ~(SECTOR_SIZE - 1);
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}
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if (header.signature != VDI_SIGNATURE) {
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error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32
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")", header.signature);
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ret = -EINVAL;
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goto fail;
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} else if (header.version != VDI_VERSION_1_1) {
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error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32
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")", header.version >> 16, header.version & 0xffff);
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ret = -ENOTSUP;
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goto fail;
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} else if (header.offset_bmap % SECTOR_SIZE != 0) {
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/* We only support block maps which start on a sector boundary. */
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error_setg(errp, "unsupported VDI image (unaligned block map offset "
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"0x%" PRIx32 ")", header.offset_bmap);
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ret = -ENOTSUP;
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goto fail;
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} else if (header.offset_data % SECTOR_SIZE != 0) {
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/* We only support data blocks which start on a sector boundary. */
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error_setg(errp, "unsupported VDI image (unaligned data offset 0x%"
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PRIx32 ")", header.offset_data);
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ret = -ENOTSUP;
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goto fail;
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} else if (header.sector_size != SECTOR_SIZE) {
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error_setg(errp, "unsupported VDI image (sector size %" PRIu32
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" is not %u)", header.sector_size, SECTOR_SIZE);
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ret = -ENOTSUP;
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goto fail;
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} else if (header.block_size != DEFAULT_CLUSTER_SIZE) {
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error_setg(errp, "unsupported VDI image (block size %" PRIu32
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" is not %u)", header.block_size, DEFAULT_CLUSTER_SIZE);
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ret = -ENOTSUP;
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goto fail;
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} else if (header.disk_size >
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(uint64_t)header.blocks_in_image * header.block_size) {
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error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", "
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"image bitmap has room for %" PRIu64 ")",
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header.disk_size,
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(uint64_t)header.blocks_in_image * header.block_size);
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ret = -ENOTSUP;
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goto fail;
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} else if (!uuid_is_null(header.uuid_link)) {
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error_setg(errp, "unsupported VDI image (non-NULL link UUID)");
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ret = -ENOTSUP;
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goto fail;
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} else if (!uuid_is_null(header.uuid_parent)) {
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error_setg(errp, "unsupported VDI image (non-NULL parent UUID)");
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ret = -ENOTSUP;
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goto fail;
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} else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) {
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error_setg(errp, "unsupported VDI image "
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"(too many blocks %u, max is %u)",
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header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX);
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ret = -ENOTSUP;
|
|
goto fail;
|
|
}
|
|
|
|
bs->total_sectors = header.disk_size / SECTOR_SIZE;
|
|
|
|
s->block_size = header.block_size;
|
|
s->block_sectors = header.block_size / SECTOR_SIZE;
|
|
s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
|
|
s->header = header;
|
|
|
|
bmap_size = header.blocks_in_image * sizeof(uint32_t);
|
|
bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
|
|
s->bmap = g_malloc(bmap_size * SECTOR_SIZE);
|
|
ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size);
|
|
if (ret < 0) {
|
|
goto fail_free_bmap;
|
|
}
|
|
|
|
/* Disable migration when vdi images are used */
|
|
error_set(&s->migration_blocker,
|
|
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
|
|
"vdi", bs->device_name, "live migration");
|
|
migrate_add_blocker(s->migration_blocker);
|
|
|
|
return 0;
|
|
|
|
fail_free_bmap:
|
|
g_free(s->bmap);
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int vdi_reopen_prepare(BDRVReopenState *state,
|
|
BlockReopenQueue *queue, Error **errp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int64_t coroutine_fn vdi_co_get_block_status(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors, int *pnum)
|
|
{
|
|
/* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
|
|
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
|
|
size_t bmap_index = sector_num / s->block_sectors;
|
|
size_t sector_in_block = sector_num % s->block_sectors;
|
|
int n_sectors = s->block_sectors - sector_in_block;
|
|
uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
|
|
uint64_t offset;
|
|
int result;
|
|
|
|
logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
|
|
if (n_sectors > nb_sectors) {
|
|
n_sectors = nb_sectors;
|
|
}
|
|
*pnum = n_sectors;
|
|
result = VDI_IS_ALLOCATED(bmap_entry);
|
|
if (!result) {
|
|
return 0;
|
|
}
|
|
|
|
offset = s->header.offset_data +
|
|
(uint64_t)bmap_entry * s->block_size +
|
|
sector_in_block * SECTOR_SIZE;
|
|
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
|
|
}
|
|
|
|
static int vdi_co_read(BlockDriverState *bs,
|
|
int64_t sector_num, uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
uint32_t bmap_entry;
|
|
uint32_t block_index;
|
|
uint32_t sector_in_block;
|
|
uint32_t n_sectors;
|
|
int ret = 0;
|
|
|
|
logout("\n");
|
|
|
|
while (ret >= 0 && nb_sectors > 0) {
|
|
block_index = sector_num / s->block_sectors;
|
|
sector_in_block = sector_num % s->block_sectors;
|
|
n_sectors = s->block_sectors - sector_in_block;
|
|
if (n_sectors > nb_sectors) {
|
|
n_sectors = nb_sectors;
|
|
}
|
|
|
|
logout("will read %u sectors starting at sector %" PRIu64 "\n",
|
|
n_sectors, sector_num);
|
|
|
|
/* prepare next AIO request */
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
if (!VDI_IS_ALLOCATED(bmap_entry)) {
|
|
/* Block not allocated, return zeros, no need to wait. */
|
|
memset(buf, 0, n_sectors * SECTOR_SIZE);
|
|
ret = 0;
|
|
} else {
|
|
uint64_t offset = s->header.offset_data / SECTOR_SIZE +
|
|
(uint64_t)bmap_entry * s->block_sectors +
|
|
sector_in_block;
|
|
ret = bdrv_read(bs->file, offset, buf, n_sectors);
|
|
}
|
|
logout("%u sectors read\n", n_sectors);
|
|
|
|
nb_sectors -= n_sectors;
|
|
sector_num += n_sectors;
|
|
buf += n_sectors * SECTOR_SIZE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vdi_co_write(BlockDriverState *bs,
|
|
int64_t sector_num, const uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
uint32_t bmap_entry;
|
|
uint32_t block_index;
|
|
uint32_t sector_in_block;
|
|
uint32_t n_sectors;
|
|
uint32_t bmap_first = VDI_UNALLOCATED;
|
|
uint32_t bmap_last = VDI_UNALLOCATED;
|
|
uint8_t *block = NULL;
|
|
int ret = 0;
|
|
|
|
logout("\n");
|
|
|
|
while (ret >= 0 && nb_sectors > 0) {
|
|
block_index = sector_num / s->block_sectors;
|
|
sector_in_block = sector_num % s->block_sectors;
|
|
n_sectors = s->block_sectors - sector_in_block;
|
|
if (n_sectors > nb_sectors) {
|
|
n_sectors = nb_sectors;
|
|
}
|
|
|
|
logout("will write %u sectors starting at sector %" PRIu64 "\n",
|
|
n_sectors, sector_num);
|
|
|
|
/* prepare next AIO request */
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
if (!VDI_IS_ALLOCATED(bmap_entry)) {
|
|
/* Allocate new block and write to it. */
|
|
uint64_t offset;
|
|
bmap_entry = s->header.blocks_allocated;
|
|
s->bmap[block_index] = cpu_to_le32(bmap_entry);
|
|
s->header.blocks_allocated++;
|
|
offset = s->header.offset_data / SECTOR_SIZE +
|
|
(uint64_t)bmap_entry * s->block_sectors;
|
|
if (block == NULL) {
|
|
block = g_malloc(s->block_size);
|
|
bmap_first = block_index;
|
|
}
|
|
bmap_last = block_index;
|
|
/* Copy data to be written to new block and zero unused parts. */
|
|
memset(block, 0, sector_in_block * SECTOR_SIZE);
|
|
memcpy(block + sector_in_block * SECTOR_SIZE,
|
|
buf, n_sectors * SECTOR_SIZE);
|
|
memset(block + (sector_in_block + n_sectors) * SECTOR_SIZE, 0,
|
|
(s->block_sectors - n_sectors - sector_in_block) * SECTOR_SIZE);
|
|
ret = bdrv_write(bs->file, offset, block, s->block_sectors);
|
|
} else {
|
|
uint64_t offset = s->header.offset_data / SECTOR_SIZE +
|
|
(uint64_t)bmap_entry * s->block_sectors +
|
|
sector_in_block;
|
|
ret = bdrv_write(bs->file, offset, buf, n_sectors);
|
|
}
|
|
|
|
nb_sectors -= n_sectors;
|
|
sector_num += n_sectors;
|
|
buf += n_sectors * SECTOR_SIZE;
|
|
|
|
logout("%u sectors written\n", n_sectors);
|
|
}
|
|
|
|
logout("finished data write\n");
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (block) {
|
|
/* One or more new blocks were allocated. */
|
|
VdiHeader *header = (VdiHeader *) block;
|
|
uint8_t *base;
|
|
uint64_t offset;
|
|
|
|
logout("now writing modified header\n");
|
|
assert(VDI_IS_ALLOCATED(bmap_first));
|
|
*header = s->header;
|
|
vdi_header_to_le(header);
|
|
ret = bdrv_write(bs->file, 0, block, 1);
|
|
g_free(block);
|
|
block = NULL;
|
|
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
logout("now writing modified block map entry %u...%u\n",
|
|
bmap_first, bmap_last);
|
|
/* Write modified sectors from block map. */
|
|
bmap_first /= (SECTOR_SIZE / sizeof(uint32_t));
|
|
bmap_last /= (SECTOR_SIZE / sizeof(uint32_t));
|
|
n_sectors = bmap_last - bmap_first + 1;
|
|
offset = s->bmap_sector + bmap_first;
|
|
base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE;
|
|
logout("will write %u block map sectors starting from entry %u\n",
|
|
n_sectors, bmap_first);
|
|
ret = bdrv_write(bs->file, offset, base, n_sectors);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vdi_create(const char *filename, QEMUOptionParameter *options,
|
|
Error **errp)
|
|
{
|
|
int fd;
|
|
int result = 0;
|
|
uint64_t bytes = 0;
|
|
uint32_t blocks;
|
|
size_t block_size = DEFAULT_CLUSTER_SIZE;
|
|
uint32_t image_type = VDI_TYPE_DYNAMIC;
|
|
VdiHeader header;
|
|
size_t i;
|
|
size_t bmap_size;
|
|
|
|
logout("\n");
|
|
|
|
/* Read out options. */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
|
bytes = options->value.n;
|
|
#if defined(CONFIG_VDI_BLOCK_SIZE)
|
|
} else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) {
|
|
if (options->value.n) {
|
|
/* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */
|
|
block_size = options->value.n;
|
|
}
|
|
#endif
|
|
#if defined(CONFIG_VDI_STATIC_IMAGE)
|
|
} else if (!strcmp(options->name, BLOCK_OPT_STATIC)) {
|
|
if (options->value.n) {
|
|
image_type = VDI_TYPE_STATIC;
|
|
}
|
|
#endif
|
|
}
|
|
options++;
|
|
}
|
|
|
|
if (bytes > VDI_DISK_SIZE_MAX) {
|
|
result = -ENOTSUP;
|
|
error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
|
|
", max supported is 0x%" PRIx64 ")",
|
|
bytes, VDI_DISK_SIZE_MAX);
|
|
goto exit;
|
|
}
|
|
|
|
fd = qemu_open(filename,
|
|
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
if (fd < 0) {
|
|
result = -errno;
|
|
goto exit;
|
|
}
|
|
|
|
/* We need enough blocks to store the given disk size,
|
|
so always round up. */
|
|
blocks = (bytes + block_size - 1) / block_size;
|
|
|
|
bmap_size = blocks * sizeof(uint32_t);
|
|
bmap_size = ((bmap_size + SECTOR_SIZE - 1) & ~(SECTOR_SIZE -1));
|
|
|
|
memset(&header, 0, sizeof(header));
|
|
pstrcpy(header.text, sizeof(header.text), VDI_TEXT);
|
|
header.signature = VDI_SIGNATURE;
|
|
header.version = VDI_VERSION_1_1;
|
|
header.header_size = 0x180;
|
|
header.image_type = image_type;
|
|
header.offset_bmap = 0x200;
|
|
header.offset_data = 0x200 + bmap_size;
|
|
header.sector_size = SECTOR_SIZE;
|
|
header.disk_size = bytes;
|
|
header.block_size = block_size;
|
|
header.blocks_in_image = blocks;
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
header.blocks_allocated = blocks;
|
|
}
|
|
uuid_generate(header.uuid_image);
|
|
uuid_generate(header.uuid_last_snap);
|
|
/* There is no need to set header.uuid_link or header.uuid_parent here. */
|
|
#if defined(CONFIG_VDI_DEBUG)
|
|
vdi_header_print(&header);
|
|
#endif
|
|
vdi_header_to_le(&header);
|
|
if (write(fd, &header, sizeof(header)) < 0) {
|
|
result = -errno;
|
|
goto close_and_exit;
|
|
}
|
|
|
|
if (bmap_size > 0) {
|
|
uint32_t *bmap = g_malloc0(bmap_size);
|
|
for (i = 0; i < blocks; i++) {
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
bmap[i] = i;
|
|
} else {
|
|
bmap[i] = VDI_UNALLOCATED;
|
|
}
|
|
}
|
|
if (write(fd, bmap, bmap_size) < 0) {
|
|
result = -errno;
|
|
g_free(bmap);
|
|
goto close_and_exit;
|
|
}
|
|
g_free(bmap);
|
|
}
|
|
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
if (ftruncate(fd, sizeof(header) + bmap_size + blocks * block_size)) {
|
|
result = -errno;
|
|
goto close_and_exit;
|
|
}
|
|
}
|
|
|
|
close_and_exit:
|
|
if ((close(fd) < 0) && !result) {
|
|
result = -errno;
|
|
}
|
|
|
|
exit:
|
|
return result;
|
|
}
|
|
|
|
static void vdi_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
|
|
g_free(s->bmap);
|
|
|
|
migrate_del_blocker(s->migration_blocker);
|
|
error_free(s->migration_blocker);
|
|
}
|
|
|
|
static QEMUOptionParameter vdi_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
#if defined(CONFIG_VDI_BLOCK_SIZE)
|
|
{
|
|
.name = BLOCK_OPT_CLUSTER_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "VDI cluster (block) size",
|
|
.value = { .n = DEFAULT_CLUSTER_SIZE },
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_VDI_STATIC_IMAGE)
|
|
{
|
|
.name = BLOCK_OPT_STATIC,
|
|
.type = OPT_FLAG,
|
|
.help = "VDI static (pre-allocated) image"
|
|
},
|
|
#endif
|
|
/* TODO: An additional option to set UUID values might be useful. */
|
|
{ NULL }
|
|
};
|
|
|
|
static BlockDriver bdrv_vdi = {
|
|
.format_name = "vdi",
|
|
.instance_size = sizeof(BDRVVdiState),
|
|
.bdrv_probe = vdi_probe,
|
|
.bdrv_open = vdi_open,
|
|
.bdrv_close = vdi_close,
|
|
.bdrv_reopen_prepare = vdi_reopen_prepare,
|
|
.bdrv_create = vdi_create,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_co_get_block_status = vdi_co_get_block_status,
|
|
.bdrv_make_empty = vdi_make_empty,
|
|
|
|
.bdrv_read = vdi_co_read,
|
|
#if defined(CONFIG_VDI_WRITE)
|
|
.bdrv_write = vdi_co_write,
|
|
#endif
|
|
|
|
.bdrv_get_info = vdi_get_info,
|
|
|
|
.create_options = vdi_create_options,
|
|
.bdrv_check = vdi_check,
|
|
};
|
|
|
|
static void bdrv_vdi_init(void)
|
|
{
|
|
logout("\n");
|
|
bdrv_register(&bdrv_vdi);
|
|
}
|
|
|
|
block_init(bdrv_vdi_init);
|