957 lines
29 KiB
C
957 lines
29 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 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 adjacents 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_int.h"
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#include "module.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.h" /* UUID_FMT */
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typedef unsigned char uuid_t[16];
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void uuid_generate(uuid_t out);
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int uuid_is_null(const uuid_t uu);
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void uuid_unparse(const uuid_t uu, char *out);
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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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#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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/* Unallocated blocks use this index (no need to convert endianess). */
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#define VDI_UNALLOCATED UINT32_MAX
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#if !defined(CONFIG_UUID)
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void uuid_generate(uuid_t out)
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{
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memset(out, 0, sizeof(out));
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}
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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(uu)) == 0;
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}
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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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BlockDriverAIOCB common;
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int64_t sector_num;
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QEMUIOVector *qiov;
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uint8_t *buf;
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/* Total number of sectors. */
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int nb_sectors;
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/* Number of sectors for current AIO. */
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int n_sectors;
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/* New allocated block map entry. */
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uint32_t bmap_first;
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uint32_t bmap_last;
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/* Buffer for new allocated block. */
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void *block_buffer;
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void *orig_buf;
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int header_modified;
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BlockDriverAIOCB *hd_aiocb;
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struct iovec hd_iov;
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QEMUIOVector hd_qiov;
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QEMUBH *bh;
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} VdiAIOCB;
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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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} VdiHeader;
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typedef struct {
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BlockDriverState *hd;
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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 endianess). */
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VdiHeader header;
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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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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%04x\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)
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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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int n_errors = 0;
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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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bmap = qemu_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 (bmap_entry != VDI_UNALLOCATED) {
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if (bmap_entry < s->header.blocks_in_image) {
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blocks_allocated++;
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if (bmap[bmap_entry] == VDI_UNALLOCATED) {
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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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}
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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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n_errors++;
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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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n_errors++;
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}
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qemu_free(bmap);
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return n_errors;
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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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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, const char *filename, int flags)
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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_file_open(&s->hd, filename, flags);
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if (ret < 0) {
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return ret;
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}
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if (bdrv_read(s->hd, 0, (uint8_t *)&header, 1) < 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.version != VDI_VERSION_1_1) {
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logout("unsupported version %u.%u\n",
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header.version >> 16, header.version & 0xffff);
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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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logout("unsupported block map offset 0x%x B\n", header.offset_bmap);
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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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logout("unsupported data offset 0x%x B\n", header.offset_data);
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goto fail;
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} else if (header.sector_size != SECTOR_SIZE) {
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logout("unsupported sector size %u B\n", header.sector_size);
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goto fail;
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} else if (header.block_size != 1 * MiB) {
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logout("unsupported block size %u B\n", header.block_size);
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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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logout("unexpected block number %u B\n", header.blocks_in_image);
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goto fail;
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} else if (!uuid_is_null(header.uuid_link)) {
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logout("link uuid != 0, unsupported\n");
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goto fail;
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} else if (!uuid_is_null(header.uuid_parent)) {
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logout("parent uuid != 0, unsupported\n");
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goto fail;
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}
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bs->total_sectors = header.disk_size / SECTOR_SIZE;
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s->block_size = header.block_size;
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s->block_sectors = header.block_size / SECTOR_SIZE;
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s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
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s->header = header;
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bmap_size = header.blocks_in_image * sizeof(uint32_t);
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bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
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s->bmap = qemu_malloc(bmap_size * SECTOR_SIZE);
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if (bdrv_read(s->hd, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) < 0) {
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goto fail_free_bmap;
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}
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return 0;
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fail_free_bmap:
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qemu_free(s->bmap);
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fail:
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bdrv_delete(s->hd);
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return -1;
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}
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static int vdi_is_allocated(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum)
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{
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/* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
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BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
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size_t bmap_index = sector_num / s->block_sectors;
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size_t sector_in_block = sector_num % s->block_sectors;
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int n_sectors = s->block_sectors - sector_in_block;
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uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
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logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
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if (n_sectors > nb_sectors) {
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n_sectors = nb_sectors;
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}
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*pnum = n_sectors;
|
|
return bmap_entry != VDI_UNALLOCATED;
|
|
}
|
|
|
|
static void vdi_aio_cancel(BlockDriverAIOCB *blockacb)
|
|
{
|
|
/* TODO: This code is untested. How can I get it executed? */
|
|
VdiAIOCB *acb = (VdiAIOCB *)blockacb;
|
|
logout("\n");
|
|
if (acb->hd_aiocb) {
|
|
bdrv_aio_cancel(acb->hd_aiocb);
|
|
}
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static AIOPool vdi_aio_pool = {
|
|
.aiocb_size = sizeof(VdiAIOCB),
|
|
.cancel = vdi_aio_cancel,
|
|
};
|
|
|
|
static VdiAIOCB *vdi_aio_setup(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque, int is_write)
|
|
{
|
|
VdiAIOCB *acb;
|
|
|
|
logout("%p, %" PRId64 ", %p, %d, %p, %p, %d\n",
|
|
bs, sector_num, qiov, nb_sectors, cb, opaque, is_write);
|
|
|
|
acb = qemu_aio_get(&vdi_aio_pool, bs, cb, opaque);
|
|
if (acb) {
|
|
acb->hd_aiocb = NULL;
|
|
acb->sector_num = sector_num;
|
|
acb->qiov = qiov;
|
|
if (qiov->niov > 1) {
|
|
acb->buf = qemu_blockalign(bs, qiov->size);
|
|
acb->orig_buf = acb->buf;
|
|
if (is_write) {
|
|
qemu_iovec_to_buffer(qiov, acb->buf);
|
|
}
|
|
} else {
|
|
acb->buf = (uint8_t *)qiov->iov->iov_base;
|
|
}
|
|
acb->nb_sectors = nb_sectors;
|
|
acb->n_sectors = 0;
|
|
acb->bmap_first = VDI_UNALLOCATED;
|
|
acb->bmap_last = VDI_UNALLOCATED;
|
|
acb->block_buffer = NULL;
|
|
acb->header_modified = 0;
|
|
}
|
|
return acb;
|
|
}
|
|
|
|
static int vdi_schedule_bh(QEMUBHFunc *cb, VdiAIOCB *acb)
|
|
{
|
|
logout("\n");
|
|
|
|
if (acb->bh) {
|
|
return -EIO;
|
|
}
|
|
|
|
acb->bh = qemu_bh_new(cb, acb);
|
|
if (!acb->bh) {
|
|
return -EIO;
|
|
}
|
|
|
|
qemu_bh_schedule(acb->bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vdi_aio_read_cb(void *opaque, int ret);
|
|
|
|
static void vdi_aio_read_bh(void *opaque)
|
|
{
|
|
VdiAIOCB *acb = opaque;
|
|
logout("\n");
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
vdi_aio_read_cb(opaque, 0);
|
|
}
|
|
|
|
static void vdi_aio_read_cb(void *opaque, int ret)
|
|
{
|
|
VdiAIOCB *acb = opaque;
|
|
BlockDriverState *bs = acb->common.bs;
|
|
BDRVVdiState *s = bs->opaque;
|
|
uint32_t bmap_entry;
|
|
uint32_t block_index;
|
|
uint32_t sector_in_block;
|
|
uint32_t n_sectors;
|
|
|
|
logout("%u sectors read\n", acb->n_sectors);
|
|
|
|
acb->hd_aiocb = NULL;
|
|
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
|
|
acb->nb_sectors -= acb->n_sectors;
|
|
|
|
if (acb->nb_sectors == 0) {
|
|
/* request completed */
|
|
ret = 0;
|
|
goto done;
|
|
}
|
|
|
|
acb->sector_num += acb->n_sectors;
|
|
acb->buf += acb->n_sectors * SECTOR_SIZE;
|
|
|
|
block_index = acb->sector_num / s->block_sectors;
|
|
sector_in_block = acb->sector_num % s->block_sectors;
|
|
n_sectors = s->block_sectors - sector_in_block;
|
|
if (n_sectors > acb->nb_sectors) {
|
|
n_sectors = acb->nb_sectors;
|
|
}
|
|
|
|
logout("will read %u sectors starting at sector %" PRIu64 "\n",
|
|
n_sectors, acb->sector_num);
|
|
|
|
/* prepare next AIO request */
|
|
acb->n_sectors = n_sectors;
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
if (bmap_entry == VDI_UNALLOCATED) {
|
|
/* Block not allocated, return zeros, no need to wait. */
|
|
memset(acb->buf, 0, n_sectors * SECTOR_SIZE);
|
|
ret = vdi_schedule_bh(vdi_aio_read_bh, acb);
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
} else {
|
|
uint64_t offset = s->header.offset_data / SECTOR_SIZE +
|
|
(uint64_t)bmap_entry * s->block_sectors +
|
|
sector_in_block;
|
|
acb->hd_iov.iov_base = (void *)acb->buf;
|
|
acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
|
|
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
|
acb->hd_aiocb = bdrv_aio_readv(s->hd, offset, &acb->hd_qiov,
|
|
n_sectors, vdi_aio_read_cb, acb);
|
|
if (acb->hd_aiocb == NULL) {
|
|
goto done;
|
|
}
|
|
}
|
|
return;
|
|
done:
|
|
if (acb->qiov->niov > 1) {
|
|
qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size);
|
|
qemu_vfree(acb->orig_buf);
|
|
}
|
|
acb->common.cb(acb->common.opaque, ret);
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static BlockDriverAIOCB *vdi_aio_readv(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
VdiAIOCB *acb;
|
|
logout("\n");
|
|
acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
|
if (!acb) {
|
|
return NULL;
|
|
}
|
|
vdi_aio_read_cb(acb, 0);
|
|
return &acb->common;
|
|
}
|
|
|
|
static void vdi_aio_write_cb(void *opaque, int ret)
|
|
{
|
|
VdiAIOCB *acb = opaque;
|
|
BlockDriverState *bs = acb->common.bs;
|
|
BDRVVdiState *s = bs->opaque;
|
|
uint32_t bmap_entry;
|
|
uint32_t block_index;
|
|
uint32_t sector_in_block;
|
|
uint32_t n_sectors;
|
|
|
|
acb->hd_aiocb = NULL;
|
|
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
|
|
acb->nb_sectors -= acb->n_sectors;
|
|
acb->sector_num += acb->n_sectors;
|
|
acb->buf += acb->n_sectors * SECTOR_SIZE;
|
|
|
|
if (acb->nb_sectors == 0) {
|
|
logout("finished data write\n");
|
|
acb->n_sectors = 0;
|
|
if (acb->header_modified) {
|
|
VdiHeader *header = acb->block_buffer;
|
|
logout("now writing modified header\n");
|
|
assert(acb->bmap_first != VDI_UNALLOCATED);
|
|
*header = s->header;
|
|
vdi_header_to_le(header);
|
|
acb->header_modified = 0;
|
|
acb->hd_iov.iov_base = acb->block_buffer;
|
|
acb->hd_iov.iov_len = SECTOR_SIZE;
|
|
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
|
acb->hd_aiocb = bdrv_aio_writev(s->hd, 0, &acb->hd_qiov, 1,
|
|
vdi_aio_write_cb, acb);
|
|
if (acb->hd_aiocb == NULL) {
|
|
goto done;
|
|
}
|
|
return;
|
|
} else if (acb->bmap_first != VDI_UNALLOCATED) {
|
|
/* One or more new blocks were allocated. */
|
|
uint64_t offset;
|
|
uint32_t bmap_first;
|
|
uint32_t bmap_last;
|
|
qemu_free(acb->block_buffer);
|
|
acb->block_buffer = NULL;
|
|
bmap_first = acb->bmap_first;
|
|
bmap_last = acb->bmap_last;
|
|
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;
|
|
acb->bmap_first = VDI_UNALLOCATED;
|
|
acb->hd_iov.iov_base = (void *)((uint8_t *)&s->bmap[0] +
|
|
bmap_first * SECTOR_SIZE);
|
|
acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
|
|
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
|
logout("will write %u block map sectors starting from entry %u\n",
|
|
n_sectors, bmap_first);
|
|
acb->hd_aiocb = bdrv_aio_writev(s->hd, offset, &acb->hd_qiov,
|
|
n_sectors, vdi_aio_write_cb, acb);
|
|
if (acb->hd_aiocb == NULL) {
|
|
goto done;
|
|
}
|
|
return;
|
|
}
|
|
ret = 0;
|
|
goto done;
|
|
}
|
|
|
|
logout("%u sectors written\n", acb->n_sectors);
|
|
|
|
block_index = acb->sector_num / s->block_sectors;
|
|
sector_in_block = acb->sector_num % s->block_sectors;
|
|
n_sectors = s->block_sectors - sector_in_block;
|
|
if (n_sectors > acb->nb_sectors) {
|
|
n_sectors = acb->nb_sectors;
|
|
}
|
|
|
|
logout("will write %u sectors starting at sector %" PRIu64 "\n",
|
|
n_sectors, acb->sector_num);
|
|
|
|
/* prepare next AIO request */
|
|
acb->n_sectors = n_sectors;
|
|
bmap_entry = le32_to_cpu(s->bmap[block_index]);
|
|
if (bmap_entry == VDI_UNALLOCATED) {
|
|
/* Allocate new block and write to it. */
|
|
uint64_t offset;
|
|
uint8_t *block;
|
|
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;
|
|
block = acb->block_buffer;
|
|
if (block == NULL) {
|
|
block = qemu_mallocz(s->block_size);
|
|
acb->block_buffer = block;
|
|
acb->bmap_first = block_index;
|
|
assert(!acb->header_modified);
|
|
acb->header_modified = 1;
|
|
}
|
|
acb->bmap_last = block_index;
|
|
memcpy(block + sector_in_block * SECTOR_SIZE,
|
|
acb->buf, n_sectors * SECTOR_SIZE);
|
|
acb->hd_iov.iov_base = (void *)block;
|
|
acb->hd_iov.iov_len = s->block_size;
|
|
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
|
acb->hd_aiocb = bdrv_aio_writev(s->hd, offset,
|
|
&acb->hd_qiov, s->block_sectors,
|
|
vdi_aio_write_cb, acb);
|
|
if (acb->hd_aiocb == NULL) {
|
|
goto done;
|
|
}
|
|
} else {
|
|
uint64_t offset = s->header.offset_data / SECTOR_SIZE +
|
|
(uint64_t)bmap_entry * s->block_sectors +
|
|
sector_in_block;
|
|
acb->hd_iov.iov_base = (void *)acb->buf;
|
|
acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
|
|
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
|
acb->hd_aiocb = bdrv_aio_writev(s->hd, offset, &acb->hd_qiov,
|
|
n_sectors, vdi_aio_write_cb, acb);
|
|
if (acb->hd_aiocb == NULL) {
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
done:
|
|
if (acb->qiov->niov > 1) {
|
|
qemu_vfree(acb->orig_buf);
|
|
}
|
|
acb->common.cb(acb->common.opaque, ret);
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static BlockDriverAIOCB *vdi_aio_writev(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
VdiAIOCB *acb;
|
|
logout("\n");
|
|
acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
|
if (!acb) {
|
|
return NULL;
|
|
}
|
|
vdi_aio_write_cb(acb, 0);
|
|
return &acb->common;
|
|
}
|
|
|
|
static int vdi_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
int fd;
|
|
int result = 0;
|
|
uint64_t bytes = 0;
|
|
uint32_t blocks;
|
|
size_t block_size = 1 * MiB;
|
|
uint32_t image_type = VDI_TYPE_DYNAMIC;
|
|
VdiHeader header;
|
|
size_t i;
|
|
size_t bmap_size;
|
|
uint32_t *bmap;
|
|
|
|
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++;
|
|
}
|
|
|
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
if (fd < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
blocks = bytes / 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;
|
|
}
|
|
|
|
bmap = (uint32_t *)qemu_mallocz(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;
|
|
}
|
|
qemu_free(bmap);
|
|
if (image_type == VDI_TYPE_STATIC) {
|
|
if (ftruncate(fd, sizeof(header) + bmap_size + blocks * block_size)) {
|
|
result = -errno;
|
|
}
|
|
}
|
|
|
|
if (close(fd) < 0) {
|
|
result = -errno;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void vdi_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
logout("\n");
|
|
bdrv_delete(s->hd);
|
|
}
|
|
|
|
static void vdi_flush(BlockDriverState *bs)
|
|
{
|
|
BDRVVdiState *s = bs->opaque;
|
|
logout("\n");
|
|
bdrv_flush(s->hd);
|
|
}
|
|
|
|
|
|
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"
|
|
},
|
|
#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_create = vdi_create,
|
|
.bdrv_flush = vdi_flush,
|
|
.bdrv_is_allocated = vdi_is_allocated,
|
|
.bdrv_make_empty = vdi_make_empty,
|
|
|
|
.bdrv_aio_readv = vdi_aio_readv,
|
|
#if defined(CONFIG_VDI_WRITE)
|
|
.bdrv_aio_writev = vdi_aio_writev,
|
|
#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);
|