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1066 lines
35 KiB
C
1066 lines
35 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/osdep.h"
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#include "qemu/units.h"
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#include "qapi/error.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "block/block_int.h"
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#include "block/qdict.h"
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#include "sysemu/block-backend.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "qemu/bswap.h"
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#include "migration/blocker.h"
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#include "qemu/coroutine.h"
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#include "qemu/cutils.h"
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#include "qemu/uuid.h"
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#include "qemu/memalign.h"
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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 SECTOR_SIZE 512
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#define DEFAULT_CLUSTER_SIZE 1048576
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/* Note: can't use 1 * MiB, because it's passed to stringify() */
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#if defined(CONFIG_VDI_DEBUG)
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#define VDI_DEBUG 1
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#else
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#define VDI_DEBUG 0
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#endif
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#define logout(fmt, ...) \
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do { \
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if (VDI_DEBUG) { \
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fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__); \
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} \
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} while (0)
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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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/* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since
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* the bmap is read and written in a single operation, its size needs to be
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* limited to INT_MAX; furthermore, when opening an image, the bmap size is
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* rounded up to be aligned on BDRV_SECTOR_SIZE.
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* Therefore this should satisfy the following:
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* VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1
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* (INT_MAX + 1 is the first value not representable as an int)
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* This guarantees that any value below or equal to the constant will, when
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* multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary,
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* still be below or equal to INT_MAX. */
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#define VDI_BLOCKS_IN_IMAGE_MAX \
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((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t)))
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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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static QemuOptsList vdi_create_opts;
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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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QemuUUID uuid_image;
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QemuUUID uuid_last_snap;
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QemuUUID uuid_link;
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QemuUUID uuid_parent;
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uint64_t unused2[7];
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} QEMU_PACKED VdiHeader;
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QEMU_BUILD_BUG_ON(sizeof(VdiHeader) != 512);
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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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/* 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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CoRwlock bmap_lock;
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Error *migration_blocker;
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} BDRVVdiState;
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static void vdi_header_to_cpu(VdiHeader *header)
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{
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header->signature = le32_to_cpu(header->signature);
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header->version = le32_to_cpu(header->version);
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header->header_size = le32_to_cpu(header->header_size);
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header->image_type = le32_to_cpu(header->image_type);
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header->image_flags = le32_to_cpu(header->image_flags);
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header->offset_bmap = le32_to_cpu(header->offset_bmap);
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header->offset_data = le32_to_cpu(header->offset_data);
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header->cylinders = le32_to_cpu(header->cylinders);
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header->heads = le32_to_cpu(header->heads);
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header->sectors = le32_to_cpu(header->sectors);
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header->sector_size = le32_to_cpu(header->sector_size);
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header->disk_size = le64_to_cpu(header->disk_size);
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header->block_size = le32_to_cpu(header->block_size);
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header->block_extra = le32_to_cpu(header->block_extra);
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header->blocks_in_image = le32_to_cpu(header->blocks_in_image);
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header->blocks_allocated = le32_to_cpu(header->blocks_allocated);
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header->uuid_image = qemu_uuid_bswap(header->uuid_image);
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header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap);
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header->uuid_link = qemu_uuid_bswap(header->uuid_link);
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header->uuid_parent = qemu_uuid_bswap(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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header->signature = cpu_to_le32(header->signature);
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header->version = cpu_to_le32(header->version);
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header->header_size = cpu_to_le32(header->header_size);
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header->image_type = cpu_to_le32(header->image_type);
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header->image_flags = cpu_to_le32(header->image_flags);
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header->offset_bmap = cpu_to_le32(header->offset_bmap);
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header->offset_data = cpu_to_le32(header->offset_data);
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header->cylinders = cpu_to_le32(header->cylinders);
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header->heads = cpu_to_le32(header->heads);
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header->sectors = cpu_to_le32(header->sectors);
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header->sector_size = cpu_to_le32(header->sector_size);
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header->disk_size = cpu_to_le64(header->disk_size);
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header->block_size = cpu_to_le32(header->block_size);
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header->block_extra = cpu_to_le32(header->block_extra);
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header->blocks_in_image = cpu_to_le32(header->blocks_in_image);
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header->blocks_allocated = cpu_to_le32(header->blocks_allocated);
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header->uuid_image = qemu_uuid_bswap(header->uuid_image);
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header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap);
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header->uuid_link = qemu_uuid_bswap(header->uuid_link);
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header->uuid_parent = qemu_uuid_bswap(header->uuid_parent);
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}
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static void vdi_header_print(VdiHeader *header)
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{
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char uuidstr[37];
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QemuUUID uuid;
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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 = header->uuid_image;
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qemu_uuid_unparse(&uuid, uuidstr);
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logout("uuid image %s\n", uuidstr);
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uuid = header->uuid_last_snap;
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qemu_uuid_unparse(&uuid, uuidstr);
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logout("uuid snap %s\n", uuidstr);
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uuid = header->uuid_link;
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qemu_uuid_unparse(&uuid, uuidstr);
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logout("uuid link %s\n", uuidstr);
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uuid = header->uuid_parent;
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qemu_uuid_unparse(&uuid, uuidstr);
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logout("uuid parent %s\n", uuidstr);
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}
|
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|
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static int coroutine_fn vdi_co_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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|
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bmap = g_try_new(uint32_t, s->header.blocks_in_image);
|
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if (s->header.blocks_in_image && bmap == NULL) {
|
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res->check_errors++;
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return -ENOMEM;
|
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}
|
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|
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memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t));
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|
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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++;
|
|
}
|
|
} 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++;
|
|
}
|
|
}
|
|
}
|
|
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++;
|
|
}
|
|
|
|
g_free(bmap);
|
|
|
|
return 0;
|
|
}
|
|
|
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static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
/* TODO: vdi_get_info would be needed for machine snapshots.
|
|
vm_state_offset is still missing. */
|
|
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
|
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logout("\n");
|
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bdi->cluster_size = s->block_size;
|
|
bdi->vm_state_offset = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int vdi_make_empty(BlockDriverState *bs)
|
|
{
|
|
/* TODO: missing code. */
|
|
logout("\n");
|
|
/* The return value for missing code must be 0, see block.c. */
|
|
return 0;
|
|
}
|
|
|
|
static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
|
|
{
|
|
const VdiHeader *header = (const VdiHeader *)buf;
|
|
int ret = 0;
|
|
|
|
logout("\n");
|
|
|
|
if (buf_size < sizeof(*header)) {
|
|
/* Header too small, no VDI. */
|
|
} else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
|
|
ret = 100;
|
|
}
|
|
|
|
if (ret == 0) {
|
|
logout("no vdi image\n");
|
|
} else {
|
|
logout("%s", header->text);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
VdiHeader header;
|
|
size_t bmap_size;
|
|
int ret;
|
|
QemuUUID uuid_link, uuid_parent;
|
|
|
|
ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
logout("\n");
|
|
|
|
ret = bdrv_pread(bs->file, 0, sizeof(header), &header, 0);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
vdi_header_to_cpu(&header);
|
|
if (VDI_DEBUG) {
|
|
vdi_header_print(&header);
|
|
}
|
|
|
|
if (header.disk_size > VDI_DISK_SIZE_MAX) {
|
|
error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
|
|
", max supported is 0x%" PRIx64 ")",
|
|
header.disk_size, VDI_DISK_SIZE_MAX);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
}
|
|
|
|
uuid_link = header.uuid_link;
|
|
uuid_parent = header.uuid_parent;
|
|
|
|
if (header.disk_size % SECTOR_SIZE != 0) {
|
|
/* 'VBoxManage convertfromraw' can create images with odd disk sizes.
|
|
We accept them but round the disk size to the next multiple of
|
|
SECTOR_SIZE. */
|
|
logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size);
|
|
header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE);
|
|
}
|
|
|
|
if (header.signature != VDI_SIGNATURE) {
|
|
error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32
|
|
")", header.signature);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
} else if (header.version != VDI_VERSION_1_1) {
|
|
error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32
|
|
")", header.version >> 16, header.version & 0xffff);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (header.offset_bmap % SECTOR_SIZE != 0) {
|
|
/* We only support block maps which start on a sector boundary. */
|
|
error_setg(errp, "unsupported VDI image (unaligned block map offset "
|
|
"0x%" PRIx32 ")", header.offset_bmap);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (header.offset_data % SECTOR_SIZE != 0) {
|
|
/* We only support data blocks which start on a sector boundary. */
|
|
error_setg(errp, "unsupported VDI image (unaligned data offset 0x%"
|
|
PRIx32 ")", header.offset_data);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (header.sector_size != SECTOR_SIZE) {
|
|
error_setg(errp, "unsupported VDI image (sector size %" PRIu32
|
|
" is not %u)", header.sector_size, SECTOR_SIZE);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (header.block_size != DEFAULT_CLUSTER_SIZE) {
|
|
error_setg(errp, "unsupported VDI image (block size %" PRIu32
|
|
" is not %" PRIu32 ")",
|
|
header.block_size, DEFAULT_CLUSTER_SIZE);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (header.disk_size >
|
|
(uint64_t)header.blocks_in_image * header.block_size) {
|
|
error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", "
|
|
"image bitmap has room for %" PRIu64 ")",
|
|
header.disk_size,
|
|
(uint64_t)header.blocks_in_image * header.block_size);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (!qemu_uuid_is_null(&uuid_link)) {
|
|
error_setg(errp, "unsupported VDI image (non-NULL link UUID)");
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (!qemu_uuid_is_null(&uuid_parent)) {
|
|
error_setg(errp, "unsupported VDI image (non-NULL parent UUID)");
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
} else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) {
|
|
error_setg(errp, "unsupported VDI image "
|
|
"(too many blocks %u, max is %u)",
|
|
header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX);
|
|
ret = -ENOTSUP;
|
|
goto fail;
|
|
}
|
|
|
|
bs->total_sectors = header.disk_size / SECTOR_SIZE;
|
|
|
|
s->block_size = header.block_size;
|
|
s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
|
|
s->header = header;
|
|
|
|
bmap_size = header.blocks_in_image * sizeof(uint32_t);
|
|
bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE);
|
|
s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE);
|
|
if (s->bmap == NULL) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ret = bdrv_pread(bs->file, header.offset_bmap, bmap_size * SECTOR_SIZE,
|
|
s->bmap, 0);
|
|
if (ret < 0) {
|
|
goto fail_free_bmap;
|
|
}
|
|
|
|
/* Disable migration when vdi images are used */
|
|
error_setg(&s->migration_blocker, "The vdi format used by node '%s' "
|
|
"does not support live migration",
|
|
bdrv_get_device_or_node_name(bs));
|
|
ret = migrate_add_blocker(s->migration_blocker, errp);
|
|
if (ret < 0) {
|
|
error_free(s->migration_blocker);
|
|
goto fail_free_bmap;
|
|
}
|
|
|
|
qemu_co_rwlock_init(&s->bmap_lock);
|
|
|
|
return 0;
|
|
|
|
fail_free_bmap:
|
|
qemu_vfree(s->bmap);
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int vdi_reopen_prepare(BDRVReopenState *state,
|
|
BlockReopenQueue *queue, Error **errp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn vdi_co_block_status(BlockDriverState *bs,
|
|
bool want_zero,
|
|
int64_t offset, int64_t bytes,
|
|
int64_t *pnum, int64_t *map,
|
|
BlockDriverState **file)
|
|
{
|
|
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
|
|
size_t bmap_index = offset / s->block_size;
|
|
size_t index_in_block = offset % s->block_size;
|
|
uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
|
|
int result;
|
|
|
|
logout("%p, %" PRId64 ", %" PRId64 ", %p\n", bs, offset, bytes, pnum);
|
|
*pnum = MIN(s->block_size - index_in_block, bytes);
|
|
result = VDI_IS_ALLOCATED(bmap_entry);
|
|
if (!result) {
|
|
return BDRV_BLOCK_ZERO;
|
|
}
|
|
|
|
*map = s->header.offset_data + (uint64_t)bmap_entry * s->block_size +
|
|
index_in_block;
|
|
*file = bs->file->bs;
|
|
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID |
|
|
(s->header.image_type == VDI_TYPE_STATIC ? BDRV_BLOCK_RECURSE : 0);
|
|
}
|
|
|
|
static int coroutine_fn
|
|
vdi_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
|
|
QEMUIOVector *qiov, BdrvRequestFlags flags)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
QEMUIOVector local_qiov;
|
|
uint32_t bmap_entry;
|
|
uint32_t block_index;
|
|
uint32_t offset_in_block;
|
|
uint32_t n_bytes;
|
|
uint64_t bytes_done = 0;
|
|
int ret = 0;
|
|
|
|
logout("\n");
|
|
|
|
qemu_iovec_init(&local_qiov, qiov->niov);
|
|
|
|
while (ret >= 0 && bytes > 0) {
|
|
block_index = offset / s->block_size;
|
|
offset_in_block = offset % s->block_size;
|
|
n_bytes = MIN(bytes, s->block_size - offset_in_block);
|
|
|
|
logout("will read %u bytes starting at offset %" PRIu64 "\n",
|
|
n_bytes, offset);
|
|
|
|
/* prepare next AIO request */
|
|
qemu_co_rwlock_rdlock(&s->bmap_lock);
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
qemu_co_rwlock_unlock(&s->bmap_lock);
|
|
if (!VDI_IS_ALLOCATED(bmap_entry)) {
|
|
/* Block not allocated, return zeros, no need to wait. */
|
|
qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
|
|
ret = 0;
|
|
} else {
|
|
uint64_t data_offset = s->header.offset_data +
|
|
(uint64_t)bmap_entry * s->block_size +
|
|
offset_in_block;
|
|
|
|
qemu_iovec_reset(&local_qiov);
|
|
qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
|
|
|
|
ret = bdrv_co_preadv(bs->file, data_offset, n_bytes,
|
|
&local_qiov, 0);
|
|
}
|
|
logout("%u bytes read\n", n_bytes);
|
|
|
|
bytes -= n_bytes;
|
|
offset += n_bytes;
|
|
bytes_done += n_bytes;
|
|
}
|
|
|
|
qemu_iovec_destroy(&local_qiov);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
vdi_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
|
|
QEMUIOVector *qiov, BdrvRequestFlags flags)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
QEMUIOVector local_qiov;
|
|
uint32_t bmap_entry;
|
|
uint32_t block_index;
|
|
uint32_t offset_in_block;
|
|
uint32_t n_bytes;
|
|
uint64_t data_offset;
|
|
uint32_t bmap_first = VDI_UNALLOCATED;
|
|
uint32_t bmap_last = VDI_UNALLOCATED;
|
|
uint8_t *block = NULL;
|
|
uint64_t bytes_done = 0;
|
|
int ret = 0;
|
|
|
|
logout("\n");
|
|
|
|
qemu_iovec_init(&local_qiov, qiov->niov);
|
|
|
|
while (ret >= 0 && bytes > 0) {
|
|
block_index = offset / s->block_size;
|
|
offset_in_block = offset % s->block_size;
|
|
n_bytes = MIN(bytes, s->block_size - offset_in_block);
|
|
|
|
logout("will write %u bytes starting at offset %" PRIu64 "\n",
|
|
n_bytes, offset);
|
|
|
|
/* prepare next AIO request */
|
|
qemu_co_rwlock_rdlock(&s->bmap_lock);
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
if (!VDI_IS_ALLOCATED(bmap_entry)) {
|
|
/* Allocate new block and write to it. */
|
|
uint64_t data_offset;
|
|
qemu_co_rwlock_upgrade(&s->bmap_lock);
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
if (VDI_IS_ALLOCATED(bmap_entry)) {
|
|
/* A concurrent allocation did the work for us. */
|
|
qemu_co_rwlock_downgrade(&s->bmap_lock);
|
|
goto nonallocating_write;
|
|
}
|
|
|
|
bmap_entry = s->header.blocks_allocated;
|
|
s->bmap[block_index] = cpu_to_le32(bmap_entry);
|
|
s->header.blocks_allocated++;
|
|
data_offset = s->header.offset_data +
|
|
(uint64_t)bmap_entry * s->block_size;
|
|
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, offset_in_block);
|
|
qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block,
|
|
n_bytes);
|
|
memset(block + offset_in_block + n_bytes, 0,
|
|
s->block_size - n_bytes - offset_in_block);
|
|
|
|
/* Write the new block under CoRwLock write-side protection,
|
|
* so this full-cluster write does not overlap a partial write
|
|
* of the same cluster, issued from the "else" branch.
|
|
*/
|
|
ret = bdrv_co_pwrite(bs->file, data_offset, s->block_size, block,
|
|
0);
|
|
qemu_co_rwlock_unlock(&s->bmap_lock);
|
|
} else {
|
|
nonallocating_write:
|
|
data_offset = s->header.offset_data +
|
|
(uint64_t)bmap_entry * s->block_size +
|
|
offset_in_block;
|
|
qemu_co_rwlock_unlock(&s->bmap_lock);
|
|
|
|
qemu_iovec_reset(&local_qiov);
|
|
qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
|
|
|
|
ret = bdrv_co_pwritev(bs->file, data_offset, n_bytes,
|
|
&local_qiov, 0);
|
|
}
|
|
|
|
bytes -= n_bytes;
|
|
offset += n_bytes;
|
|
bytes_done += n_bytes;
|
|
|
|
logout("%u bytes written\n", n_bytes);
|
|
}
|
|
|
|
qemu_iovec_destroy(&local_qiov);
|
|
|
|
logout("finished data write\n");
|
|
if (ret < 0) {
|
|
g_free(block);
|
|
return ret;
|
|
}
|
|
|
|
if (block) {
|
|
/* One or more new blocks were allocated. */
|
|
VdiHeader *header;
|
|
uint8_t *base;
|
|
uint64_t offset;
|
|
uint32_t n_sectors;
|
|
|
|
g_free(block);
|
|
header = g_malloc(sizeof(*header));
|
|
|
|
logout("now writing modified header\n");
|
|
assert(VDI_IS_ALLOCATED(bmap_first));
|
|
*header = s->header;
|
|
vdi_header_to_le(header);
|
|
ret = bdrv_co_pwrite(bs->file, 0, sizeof(*header), header, 0);
|
|
g_free(header);
|
|
|
|
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_co_pwrite(bs->file, offset * SECTOR_SIZE,
|
|
n_sectors * SECTOR_SIZE, base, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn vdi_co_do_create(BlockdevCreateOptions *create_options,
|
|
size_t block_size, Error **errp)
|
|
{
|
|
BlockdevCreateOptionsVdi *vdi_opts;
|
|
int ret = 0;
|
|
uint64_t bytes = 0;
|
|
uint32_t blocks;
|
|
uint32_t image_type;
|
|
VdiHeader header;
|
|
size_t i;
|
|
size_t bmap_size;
|
|
int64_t offset = 0;
|
|
BlockDriverState *bs_file = NULL;
|
|
BlockBackend *blk = NULL;
|
|
uint32_t *bmap = NULL;
|
|
QemuUUID uuid;
|
|
|
|
assert(create_options->driver == BLOCKDEV_DRIVER_VDI);
|
|
vdi_opts = &create_options->u.vdi;
|
|
|
|
logout("\n");
|
|
|
|
/* Validate options and set default values */
|
|
bytes = vdi_opts->size;
|
|
|
|
if (!vdi_opts->has_preallocation) {
|
|
vdi_opts->preallocation = PREALLOC_MODE_OFF;
|
|
}
|
|
switch (vdi_opts->preallocation) {
|
|
case PREALLOC_MODE_OFF:
|
|
image_type = VDI_TYPE_DYNAMIC;
|
|
break;
|
|
case PREALLOC_MODE_METADATA:
|
|
image_type = VDI_TYPE_STATIC;
|
|
break;
|
|
default:
|
|
error_setg(errp, "Preallocation mode not supported for vdi");
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifndef CONFIG_VDI_STATIC_IMAGE
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
ret = -ENOTSUP;
|
|
error_setg(errp, "Statically allocated images cannot be created in "
|
|
"this build");
|
|
goto exit;
|
|
}
|
|
#endif
|
|
#ifndef CONFIG_VDI_BLOCK_SIZE
|
|
if (block_size != DEFAULT_CLUSTER_SIZE) {
|
|
ret = -ENOTSUP;
|
|
error_setg(errp,
|
|
"A non-default cluster size is not supported in this build");
|
|
goto exit;
|
|
}
|
|
#endif
|
|
|
|
if (bytes > VDI_DISK_SIZE_MAX) {
|
|
ret = -ENOTSUP;
|
|
error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
|
|
", max supported is 0x%" PRIx64 ")",
|
|
bytes, VDI_DISK_SIZE_MAX);
|
|
goto exit;
|
|
}
|
|
|
|
/* Create BlockBackend to write to the image */
|
|
bs_file = bdrv_open_blockdev_ref(vdi_opts->file, errp);
|
|
if (!bs_file) {
|
|
ret = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
blk = blk_new_with_bs(bs_file, BLK_PERM_WRITE | BLK_PERM_RESIZE,
|
|
BLK_PERM_ALL, errp);
|
|
if (!blk) {
|
|
ret = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
blk_set_allow_write_beyond_eof(blk, true);
|
|
|
|
/* We need enough blocks to store the given disk size,
|
|
so always round up. */
|
|
blocks = DIV_ROUND_UP(bytes, block_size);
|
|
|
|
bmap_size = blocks * sizeof(uint32_t);
|
|
bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE);
|
|
|
|
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;
|
|
}
|
|
qemu_uuid_generate(&uuid);
|
|
header.uuid_image = uuid;
|
|
qemu_uuid_generate(&uuid);
|
|
header.uuid_last_snap = uuid;
|
|
/* There is no need to set header.uuid_link or header.uuid_parent here. */
|
|
if (VDI_DEBUG) {
|
|
vdi_header_print(&header);
|
|
}
|
|
vdi_header_to_le(&header);
|
|
ret = blk_co_pwrite(blk, offset, sizeof(header), &header, 0);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Error writing header");
|
|
goto exit;
|
|
}
|
|
offset += sizeof(header);
|
|
|
|
if (bmap_size > 0) {
|
|
bmap = g_try_malloc0(bmap_size);
|
|
if (bmap == NULL) {
|
|
ret = -ENOMEM;
|
|
error_setg(errp, "Could not allocate bmap");
|
|
goto exit;
|
|
}
|
|
for (i = 0; i < blocks; i++) {
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
bmap[i] = i;
|
|
} else {
|
|
bmap[i] = VDI_UNALLOCATED;
|
|
}
|
|
}
|
|
ret = blk_co_pwrite(blk, offset, bmap_size, bmap, 0);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Error writing bmap");
|
|
goto exit;
|
|
}
|
|
offset += bmap_size;
|
|
}
|
|
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
ret = blk_co_truncate(blk, offset + blocks * block_size, false,
|
|
PREALLOC_MODE_OFF, 0, errp);
|
|
if (ret < 0) {
|
|
error_prepend(errp, "Failed to statically allocate file");
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
exit:
|
|
blk_unref(blk);
|
|
bdrv_unref(bs_file);
|
|
g_free(bmap);
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn vdi_co_create(BlockdevCreateOptions *create_options,
|
|
Error **errp)
|
|
{
|
|
return vdi_co_do_create(create_options, DEFAULT_CLUSTER_SIZE, errp);
|
|
}
|
|
|
|
static int coroutine_fn vdi_co_create_opts(BlockDriver *drv,
|
|
const char *filename,
|
|
QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
QDict *qdict = NULL;
|
|
BlockdevCreateOptions *create_options = NULL;
|
|
BlockDriverState *bs_file = NULL;
|
|
uint64_t block_size = DEFAULT_CLUSTER_SIZE;
|
|
bool is_static = false;
|
|
Visitor *v;
|
|
int ret;
|
|
|
|
/* Parse options and convert legacy syntax.
|
|
*
|
|
* Since CONFIG_VDI_BLOCK_SIZE is disabled by default,
|
|
* cluster-size is not part of the QAPI schema; therefore we have
|
|
* to parse it before creating the QAPI object. */
|
|
#if defined(CONFIG_VDI_BLOCK_SIZE)
|
|
block_size = qemu_opt_get_size_del(opts,
|
|
BLOCK_OPT_CLUSTER_SIZE,
|
|
DEFAULT_CLUSTER_SIZE);
|
|
if (block_size < BDRV_SECTOR_SIZE || block_size > UINT32_MAX ||
|
|
!is_power_of_2(block_size))
|
|
{
|
|
error_setg(errp, "Invalid cluster size");
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
#endif
|
|
if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) {
|
|
is_static = true;
|
|
}
|
|
|
|
qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vdi_create_opts, true);
|
|
|
|
/* Create and open the file (protocol layer) */
|
|
ret = bdrv_create_file(filename, opts, errp);
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
|
|
bs_file = bdrv_open(filename, NULL, NULL,
|
|
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
|
|
if (!bs_file) {
|
|
ret = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
qdict_put_str(qdict, "driver", "vdi");
|
|
qdict_put_str(qdict, "file", bs_file->node_name);
|
|
if (is_static) {
|
|
qdict_put_str(qdict, "preallocation", "metadata");
|
|
}
|
|
|
|
/* Get the QAPI object */
|
|
v = qobject_input_visitor_new_flat_confused(qdict, errp);
|
|
if (!v) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp);
|
|
visit_free(v);
|
|
if (!create_options) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Silently round up size */
|
|
assert(create_options->driver == BLOCKDEV_DRIVER_VDI);
|
|
create_options->u.vdi.size = ROUND_UP(create_options->u.vdi.size,
|
|
BDRV_SECTOR_SIZE);
|
|
|
|
/* Create the vdi image (format layer) */
|
|
ret = vdi_co_do_create(create_options, block_size, errp);
|
|
done:
|
|
qobject_unref(qdict);
|
|
qapi_free_BlockdevCreateOptions(create_options);
|
|
bdrv_unref(bs_file);
|
|
return ret;
|
|
}
|
|
|
|
static void vdi_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
|
|
qemu_vfree(s->bmap);
|
|
|
|
migrate_del_blocker(s->migration_blocker);
|
|
error_free(s->migration_blocker);
|
|
}
|
|
|
|
static int vdi_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
|
|
if (s->header.image_type == VDI_TYPE_STATIC) {
|
|
return bdrv_has_zero_init(bs->file->bs);
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static QemuOptsList vdi_create_opts = {
|
|
.name = "vdi-create-opts",
|
|
.head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
#if defined(CONFIG_VDI_BLOCK_SIZE)
|
|
{
|
|
.name = BLOCK_OPT_CLUSTER_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "VDI cluster (block) size",
|
|
.def_value_str = stringify(DEFAULT_CLUSTER_SIZE)
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_VDI_STATIC_IMAGE)
|
|
{
|
|
.name = BLOCK_OPT_STATIC,
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "VDI static (pre-allocated) image",
|
|
.def_value_str = "off"
|
|
},
|
|
#endif
|
|
/* TODO: An additional option to set UUID values might be useful. */
|
|
{ /* end of list */ }
|
|
}
|
|
};
|
|
|
|
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_child_perm = bdrv_default_perms,
|
|
.bdrv_co_create = vdi_co_create,
|
|
.bdrv_co_create_opts = vdi_co_create_opts,
|
|
.bdrv_has_zero_init = vdi_has_zero_init,
|
|
.bdrv_co_block_status = vdi_co_block_status,
|
|
.bdrv_make_empty = vdi_make_empty,
|
|
|
|
.bdrv_co_preadv = vdi_co_preadv,
|
|
#if defined(CONFIG_VDI_WRITE)
|
|
.bdrv_co_pwritev = vdi_co_pwritev,
|
|
#endif
|
|
|
|
.bdrv_get_info = vdi_get_info,
|
|
|
|
.is_format = true,
|
|
.create_opts = &vdi_create_opts,
|
|
.bdrv_co_check = vdi_co_check,
|
|
};
|
|
|
|
static void bdrv_vdi_init(void)
|
|
{
|
|
logout("\n");
|
|
bdrv_register(&bdrv_vdi);
|
|
}
|
|
|
|
block_init(bdrv_vdi_init);
|