All drivers use bs->file instead of s->hd for quite a while now, so it's time to remove s->hd. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
642 lines
18 KiB
C
642 lines
18 KiB
C
/*
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* Block driver for Connectix / Microsoft Virtual PC images
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*
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* Copyright (c) 2005 Alex Beregszaszi
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* Copyright (c) 2009 Kevin Wolf <kwolf@suse.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include "block_int.h"
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#include "module.h"
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/**************************************************************/
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#define HEADER_SIZE 512
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//#define CACHE
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enum vhd_type {
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VHD_FIXED = 2,
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VHD_DYNAMIC = 3,
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VHD_DIFFERENCING = 4,
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};
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// Seconds since Jan 1, 2000 0:00:00 (UTC)
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#define VHD_TIMESTAMP_BASE 946684800
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// always big-endian
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struct vhd_footer {
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char creator[8]; // "conectix"
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uint32_t features;
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uint32_t version;
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// Offset of next header structure, 0xFFFFFFFF if none
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uint64_t data_offset;
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// Seconds since Jan 1, 2000 0:00:00 (UTC)
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uint32_t timestamp;
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char creator_app[4]; // "vpc "
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uint16_t major;
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uint16_t minor;
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char creator_os[4]; // "Wi2k"
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uint64_t orig_size;
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uint64_t size;
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uint16_t cyls;
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uint8_t heads;
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uint8_t secs_per_cyl;
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uint32_t type;
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// Checksum of the Hard Disk Footer ("one's complement of the sum of all
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// the bytes in the footer without the checksum field")
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uint32_t checksum;
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// UUID used to identify a parent hard disk (backing file)
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uint8_t uuid[16];
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uint8_t in_saved_state;
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};
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struct vhd_dyndisk_header {
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char magic[8]; // "cxsparse"
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// Offset of next header structure, 0xFFFFFFFF if none
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uint64_t data_offset;
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// Offset of the Block Allocation Table (BAT)
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uint64_t table_offset;
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uint32_t version;
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uint32_t max_table_entries; // 32bit/entry
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// 2 MB by default, must be a power of two
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uint32_t block_size;
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uint32_t checksum;
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uint8_t parent_uuid[16];
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uint32_t parent_timestamp;
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uint32_t reserved;
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// Backing file name (in UTF-16)
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uint8_t parent_name[512];
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struct {
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uint32_t platform;
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uint32_t data_space;
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uint32_t data_length;
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uint32_t reserved;
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uint64_t data_offset;
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} parent_locator[8];
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};
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typedef struct BDRVVPCState {
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uint8_t footer_buf[HEADER_SIZE];
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uint64_t free_data_block_offset;
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int max_table_entries;
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uint32_t *pagetable;
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uint64_t bat_offset;
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uint64_t last_bitmap_offset;
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uint32_t block_size;
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uint32_t bitmap_size;
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#ifdef CACHE
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uint8_t *pageentry_u8;
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uint32_t *pageentry_u32;
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uint16_t *pageentry_u16;
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uint64_t last_bitmap;
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#endif
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} BDRVVPCState;
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static uint32_t vpc_checksum(uint8_t* buf, size_t size)
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{
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uint32_t res = 0;
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int i;
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for (i = 0; i < size; i++)
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res += buf[i];
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return ~res;
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}
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static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
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{
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if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
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return 100;
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return 0;
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}
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static int vpc_open(BlockDriverState *bs, int flags)
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{
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BDRVVPCState *s = bs->opaque;
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int i;
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struct vhd_footer* footer;
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struct vhd_dyndisk_header* dyndisk_header;
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uint8_t buf[HEADER_SIZE];
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uint32_t checksum;
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if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
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goto fail;
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footer = (struct vhd_footer*) s->footer_buf;
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if (strncmp(footer->creator, "conectix", 8))
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goto fail;
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checksum = be32_to_cpu(footer->checksum);
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footer->checksum = 0;
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if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
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fprintf(stderr, "block-vpc: The header checksum of '%s' is "
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"incorrect.\n", bs->filename);
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// The visible size of a image in Virtual PC depends on the geometry
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// rather than on the size stored in the footer (the size in the footer
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// is too large usually)
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bs->total_sectors = (int64_t)
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be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
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if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
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!= HEADER_SIZE)
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goto fail;
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dyndisk_header = (struct vhd_dyndisk_header*) buf;
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if (strncmp(dyndisk_header->magic, "cxsparse", 8))
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goto fail;
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s->block_size = be32_to_cpu(dyndisk_header->block_size);
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s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
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s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
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s->pagetable = qemu_malloc(s->max_table_entries * 4);
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s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
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if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
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s->max_table_entries * 4) != s->max_table_entries * 4)
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goto fail;
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s->free_data_block_offset =
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(s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
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for (i = 0; i < s->max_table_entries; i++) {
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be32_to_cpus(&s->pagetable[i]);
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if (s->pagetable[i] != 0xFFFFFFFF) {
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int64_t next = (512 * (int64_t) s->pagetable[i]) +
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s->bitmap_size + s->block_size;
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if (next> s->free_data_block_offset)
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s->free_data_block_offset = next;
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}
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}
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s->last_bitmap_offset = (int64_t) -1;
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#ifdef CACHE
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s->pageentry_u8 = qemu_malloc(512);
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s->pageentry_u32 = s->pageentry_u8;
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s->pageentry_u16 = s->pageentry_u8;
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s->last_pagetable = -1;
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#endif
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return 0;
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fail:
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return -1;
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}
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/*
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* Returns the absolute byte offset of the given sector in the image file.
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* If the sector is not allocated, -1 is returned instead.
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*
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* The parameter write must be 1 if the offset will be used for a write
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* operation (the block bitmaps is updated then), 0 otherwise.
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*/
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static inline int64_t get_sector_offset(BlockDriverState *bs,
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int64_t sector_num, int write)
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{
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BDRVVPCState *s = bs->opaque;
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uint64_t offset = sector_num * 512;
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uint64_t bitmap_offset, block_offset;
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uint32_t pagetable_index, pageentry_index;
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pagetable_index = offset / s->block_size;
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pageentry_index = (offset % s->block_size) / 512;
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if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
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return -1; // not allocated
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bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
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block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
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// We must ensure that we don't write to any sectors which are marked as
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// unused in the bitmap. We get away with setting all bits in the block
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// bitmap each time we write to a new block. This might cause Virtual PC to
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// miss sparse read optimization, but it's not a problem in terms of
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// correctness.
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if (write && (s->last_bitmap_offset != bitmap_offset)) {
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uint8_t bitmap[s->bitmap_size];
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s->last_bitmap_offset = bitmap_offset;
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memset(bitmap, 0xff, s->bitmap_size);
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bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
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}
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// printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
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// sector_num, pagetable_index, pageentry_index,
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// bitmap_offset, block_offset);
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// disabled by reason
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#if 0
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#ifdef CACHE
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if (bitmap_offset != s->last_bitmap)
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{
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lseek(s->fd, bitmap_offset, SEEK_SET);
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s->last_bitmap = bitmap_offset;
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// Scary! Bitmap is stored as big endian 32bit entries,
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// while we used to look it up byte by byte
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read(s->fd, s->pageentry_u8, 512);
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for (i = 0; i < 128; i++)
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be32_to_cpus(&s->pageentry_u32[i]);
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}
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if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
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return -1;
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#else
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lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
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read(s->fd, &bitmap_entry, 1);
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if ((bitmap_entry >> (pageentry_index % 8)) & 1)
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return -1; // not allocated
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#endif
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#endif
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return block_offset;
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}
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/*
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* Writes the footer to the end of the image file. This is needed when the
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* file grows as it overwrites the old footer
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*
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* Returns 0 on success and < 0 on error
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*/
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static int rewrite_footer(BlockDriverState* bs)
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{
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int ret;
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BDRVVPCState *s = bs->opaque;
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int64_t offset = s->free_data_block_offset;
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ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
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if (ret < 0)
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return ret;
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return 0;
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}
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/*
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* Allocates a new block. This involves writing a new footer and updating
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* the Block Allocation Table to use the space at the old end of the image
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* file (overwriting the old footer)
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*
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* Returns the sectors' offset in the image file on success and < 0 on error
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*/
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static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
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{
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BDRVVPCState *s = bs->opaque;
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int64_t bat_offset;
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uint32_t index, bat_value;
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int ret;
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uint8_t bitmap[s->bitmap_size];
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// Check if sector_num is valid
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if ((sector_num < 0) || (sector_num > bs->total_sectors))
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return -1;
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// Write entry into in-memory BAT
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index = (sector_num * 512) / s->block_size;
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if (s->pagetable[index] != 0xFFFFFFFF)
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return -1;
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s->pagetable[index] = s->free_data_block_offset / 512;
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// Initialize the block's bitmap
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memset(bitmap, 0xff, s->bitmap_size);
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bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
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s->bitmap_size);
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// Write new footer (the old one will be overwritten)
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s->free_data_block_offset += s->block_size + s->bitmap_size;
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ret = rewrite_footer(bs);
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if (ret < 0)
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goto fail;
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// Write BAT entry to disk
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bat_offset = s->bat_offset + (4 * index);
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bat_value = be32_to_cpu(s->pagetable[index]);
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ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
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if (ret < 0)
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goto fail;
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return get_sector_offset(bs, sector_num, 0);
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fail:
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s->free_data_block_offset -= (s->block_size + s->bitmap_size);
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return -1;
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}
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static int vpc_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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{
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BDRVVPCState *s = bs->opaque;
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int ret;
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int64_t offset;
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int64_t sectors, sectors_per_block;
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while (nb_sectors > 0) {
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offset = get_sector_offset(bs, sector_num, 0);
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sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
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sectors = sectors_per_block - (sector_num % sectors_per_block);
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if (sectors > nb_sectors) {
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sectors = nb_sectors;
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}
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if (offset == -1) {
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memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
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} else {
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ret = bdrv_pread(bs->file, offset, buf,
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sectors * BDRV_SECTOR_SIZE);
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if (ret != sectors * BDRV_SECTOR_SIZE) {
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return -1;
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}
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}
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nb_sectors -= sectors;
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sector_num += sectors;
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buf += sectors * BDRV_SECTOR_SIZE;
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}
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return 0;
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}
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static int vpc_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors)
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{
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BDRVVPCState *s = bs->opaque;
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int64_t offset;
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int64_t sectors, sectors_per_block;
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int ret;
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while (nb_sectors > 0) {
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offset = get_sector_offset(bs, sector_num, 1);
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sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
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sectors = sectors_per_block - (sector_num % sectors_per_block);
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if (sectors > nb_sectors) {
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sectors = nb_sectors;
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}
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if (offset == -1) {
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offset = alloc_block(bs, sector_num);
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if (offset < 0)
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return -1;
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}
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ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
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if (ret != sectors * BDRV_SECTOR_SIZE) {
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return -1;
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}
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nb_sectors -= sectors;
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sector_num += sectors;
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buf += sectors * BDRV_SECTOR_SIZE;
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}
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return 0;
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}
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static int vpc_flush(BlockDriverState *bs)
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{
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return bdrv_flush(bs->file);
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}
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/*
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* Calculates the number of cylinders, heads and sectors per cylinder
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* based on a given number of sectors. This is the algorithm described
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* in the VHD specification.
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*
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* Note that the geometry doesn't always exactly match total_sectors but
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* may round it down.
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*
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* Returns 0 on success, -EFBIG if the size is larger than 127 GB
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*/
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static int calculate_geometry(int64_t total_sectors, uint16_t* cyls,
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uint8_t* heads, uint8_t* secs_per_cyl)
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{
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uint32_t cyls_times_heads;
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if (total_sectors > 65535 * 16 * 255)
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return -EFBIG;
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if (total_sectors > 65535 * 16 * 63) {
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*secs_per_cyl = 255;
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*heads = 16;
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cyls_times_heads = total_sectors / *secs_per_cyl;
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} else {
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*secs_per_cyl = 17;
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cyls_times_heads = total_sectors / *secs_per_cyl;
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*heads = (cyls_times_heads + 1023) / 1024;
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if (*heads < 4)
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*heads = 4;
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if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
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*secs_per_cyl = 31;
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*heads = 16;
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cyls_times_heads = total_sectors / *secs_per_cyl;
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}
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if (cyls_times_heads >= (*heads * 1024)) {
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*secs_per_cyl = 63;
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*heads = 16;
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cyls_times_heads = total_sectors / *secs_per_cyl;
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}
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}
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*cyls = cyls_times_heads / *heads;
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return 0;
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}
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static int vpc_create(const char *filename, QEMUOptionParameter *options)
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{
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uint8_t buf[1024];
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struct vhd_footer* footer = (struct vhd_footer*) buf;
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struct vhd_dyndisk_header* dyndisk_header =
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(struct vhd_dyndisk_header*) buf;
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int fd, i;
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uint16_t cyls = 0;
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uint8_t heads = 0;
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uint8_t secs_per_cyl = 0;
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size_t block_size, num_bat_entries;
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int64_t total_sectors = 0;
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// Read out options
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while (options && options->name) {
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if (!strcmp(options->name, "size")) {
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total_sectors = options->value.n / 512;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
// Create the file
|
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
|
if (fd < 0)
|
|
return -EIO;
|
|
|
|
/* Calculate matching total_size and geometry. Increase the number of
|
|
sectors requested until we get enough (or fail). */
|
|
for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
|
|
if (calculate_geometry(total_sectors + i,
|
|
&cyls, &heads, &secs_per_cyl)) {
|
|
return -EFBIG;
|
|
}
|
|
}
|
|
total_sectors = (int64_t) cyls * heads * secs_per_cyl;
|
|
|
|
// Prepare the Hard Disk Footer
|
|
memset(buf, 0, 1024);
|
|
|
|
memcpy(footer->creator, "conectix", 8);
|
|
// TODO Check if "qemu" creator_app is ok for VPC
|
|
memcpy(footer->creator_app, "qemu", 4);
|
|
memcpy(footer->creator_os, "Wi2k", 4);
|
|
|
|
footer->features = be32_to_cpu(0x02);
|
|
footer->version = be32_to_cpu(0x00010000);
|
|
footer->data_offset = be64_to_cpu(HEADER_SIZE);
|
|
footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
|
|
|
|
// Version of Virtual PC 2007
|
|
footer->major = be16_to_cpu(0x0005);
|
|
footer->minor =be16_to_cpu(0x0003);
|
|
|
|
footer->orig_size = be64_to_cpu(total_sectors * 512);
|
|
footer->size = be64_to_cpu(total_sectors * 512);
|
|
|
|
footer->cyls = be16_to_cpu(cyls);
|
|
footer->heads = heads;
|
|
footer->secs_per_cyl = secs_per_cyl;
|
|
|
|
footer->type = be32_to_cpu(VHD_DYNAMIC);
|
|
|
|
// TODO uuid is missing
|
|
|
|
footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
|
|
|
|
// Write the footer (twice: at the beginning and at the end)
|
|
block_size = 0x200000;
|
|
num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
|
|
|
|
if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE)
|
|
return -EIO;
|
|
|
|
if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0)
|
|
return -EIO;
|
|
if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE)
|
|
return -EIO;
|
|
|
|
// Write the initial BAT
|
|
if (lseek(fd, 3 * 512, SEEK_SET) < 0)
|
|
return -EIO;
|
|
|
|
memset(buf, 0xFF, 512);
|
|
for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++)
|
|
if (write(fd, buf, 512) != 512)
|
|
return -EIO;
|
|
|
|
|
|
// Prepare the Dynamic Disk Header
|
|
memset(buf, 0, 1024);
|
|
|
|
memcpy(dyndisk_header->magic, "cxsparse", 8);
|
|
|
|
dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
|
|
dyndisk_header->table_offset = be64_to_cpu(3 * 512);
|
|
dyndisk_header->version = be32_to_cpu(0x00010000);
|
|
dyndisk_header->block_size = be32_to_cpu(block_size);
|
|
dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries);
|
|
|
|
dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
|
|
|
|
// Write the header
|
|
if (lseek(fd, 512, SEEK_SET) < 0)
|
|
return -EIO;
|
|
if (write(fd, buf, 1024) != 1024)
|
|
return -EIO;
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
static void vpc_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
qemu_free(s->pagetable);
|
|
#ifdef CACHE
|
|
qemu_free(s->pageentry_u8);
|
|
#endif
|
|
}
|
|
|
|
static QEMUOptionParameter vpc_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static BlockDriver bdrv_vpc = {
|
|
.format_name = "vpc",
|
|
.instance_size = sizeof(BDRVVPCState),
|
|
.bdrv_probe = vpc_probe,
|
|
.bdrv_open = vpc_open,
|
|
.bdrv_read = vpc_read,
|
|
.bdrv_write = vpc_write,
|
|
.bdrv_flush = vpc_flush,
|
|
.bdrv_close = vpc_close,
|
|
.bdrv_create = vpc_create,
|
|
|
|
.create_options = vpc_create_options,
|
|
};
|
|
|
|
static void bdrv_vpc_init(void)
|
|
{
|
|
bdrv_register(&bdrv_vpc);
|
|
}
|
|
|
|
block_init(bdrv_vpc_init);
|