diff options
Diffstat (limited to 'qemu/block/vpc.c')
| -rw-r--r-- | qemu/block/vpc.c | 1074 |
1 files changed, 0 insertions, 1074 deletions
diff --git a/qemu/block/vpc.c b/qemu/block/vpc.c deleted file mode 100644 index 3e2ea698d..000000000 --- a/qemu/block/vpc.c +++ /dev/null @@ -1,1074 +0,0 @@ -/* - * Block driver for Connectix / Microsoft Virtual PC images - * - * Copyright (c) 2005 Alex Beregszaszi - * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ -#include "qemu/osdep.h" -#include "qapi/error.h" -#include "qemu-common.h" -#include "block/block_int.h" -#include "sysemu/block-backend.h" -#include "qemu/module.h" -#include "migration/migration.h" -#if defined(CONFIG_UUID) -#include <uuid/uuid.h> -#endif - -/**************************************************************/ - -#define HEADER_SIZE 512 - -//#define CACHE - -enum vhd_type { - VHD_FIXED = 2, - VHD_DYNAMIC = 3, - VHD_DIFFERENCING = 4, -}; - -/* Seconds since Jan 1, 2000 0:00:00 (UTC) */ -#define VHD_TIMESTAMP_BASE 946684800 - -#define VHD_CHS_MAX_C 65535LL -#define VHD_CHS_MAX_H 16 -#define VHD_CHS_MAX_S 255 - -#define VHD_MAX_SECTORS 0xff000000 /* 2040 GiB max image size */ -#define VHD_MAX_GEOMETRY (VHD_CHS_MAX_C * VHD_CHS_MAX_H * VHD_CHS_MAX_S) - -#define VPC_OPT_FORCE_SIZE "force_size" - -/* always big-endian */ -typedef struct vhd_footer { - char creator[8]; /* "conectix" */ - uint32_t features; - uint32_t version; - - /* Offset of next header structure, 0xFFFFFFFF if none */ - uint64_t data_offset; - - /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ - uint32_t timestamp; - - char creator_app[4]; /* e.g., "vpc " */ - uint16_t major; - uint16_t minor; - char creator_os[4]; /* "Wi2k" */ - - uint64_t orig_size; - uint64_t current_size; - - uint16_t cyls; - uint8_t heads; - uint8_t secs_per_cyl; - - uint32_t type; - - /* Checksum of the Hard Disk Footer ("one's complement of the sum of all - the bytes in the footer without the checksum field") */ - uint32_t checksum; - - /* UUID used to identify a parent hard disk (backing file) */ - uint8_t uuid[16]; - - uint8_t in_saved_state; -} QEMU_PACKED VHDFooter; - -typedef struct vhd_dyndisk_header { - char magic[8]; /* "cxsparse" */ - - /* Offset of next header structure, 0xFFFFFFFF if none */ - uint64_t data_offset; - - /* Offset of the Block Allocation Table (BAT) */ - uint64_t table_offset; - - uint32_t version; - uint32_t max_table_entries; /* 32bit/entry */ - - /* 2 MB by default, must be a power of two */ - uint32_t block_size; - - uint32_t checksum; - uint8_t parent_uuid[16]; - uint32_t parent_timestamp; - uint32_t reserved; - - /* Backing file name (in UTF-16) */ - uint8_t parent_name[512]; - - struct { - uint32_t platform; - uint32_t data_space; - uint32_t data_length; - uint32_t reserved; - uint64_t data_offset; - } parent_locator[8]; -} QEMU_PACKED VHDDynDiskHeader; - -typedef struct BDRVVPCState { - CoMutex lock; - uint8_t footer_buf[HEADER_SIZE]; - uint64_t free_data_block_offset; - int max_table_entries; - uint32_t *pagetable; - uint64_t bat_offset; - uint64_t last_bitmap_offset; - - uint32_t block_size; - uint32_t bitmap_size; - bool force_use_chs; - bool force_use_sz; - -#ifdef CACHE - uint8_t *pageentry_u8; - uint32_t *pageentry_u32; - uint16_t *pageentry_u16; - - uint64_t last_bitmap; -#endif - - Error *migration_blocker; -} BDRVVPCState; - -#define VPC_OPT_SIZE_CALC "force_size_calc" -static QemuOptsList vpc_runtime_opts = { - .name = "vpc-runtime-opts", - .head = QTAILQ_HEAD_INITIALIZER(vpc_runtime_opts.head), - .desc = { - { - .name = VPC_OPT_SIZE_CALC, - .type = QEMU_OPT_STRING, - .help = "Force disk size calculation to use either CHS geometry, " - "or use the disk current_size specified in the VHD footer. " - "{chs, current_size}" - }, - { /* end of list */ } - } -}; - -static uint32_t vpc_checksum(uint8_t* buf, size_t size) -{ - uint32_t res = 0; - int i; - - for (i = 0; i < size; i++) - res += buf[i]; - - return ~res; -} - - -static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) -{ - if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) - return 100; - return 0; -} - -static void vpc_parse_options(BlockDriverState *bs, QemuOpts *opts, - Error **errp) -{ - BDRVVPCState *s = bs->opaque; - const char *size_calc; - - size_calc = qemu_opt_get(opts, VPC_OPT_SIZE_CALC); - - if (!size_calc) { - /* no override, use autodetect only */ - } else if (!strcmp(size_calc, "current_size")) { - s->force_use_sz = true; - } else if (!strcmp(size_calc, "chs")) { - s->force_use_chs = true; - } else { - error_setg(errp, "Invalid size calculation mode: '%s'", size_calc); - } -} - -static int vpc_open(BlockDriverState *bs, QDict *options, int flags, - Error **errp) -{ - BDRVVPCState *s = bs->opaque; - int i; - VHDFooter *footer; - VHDDynDiskHeader *dyndisk_header; - QemuOpts *opts = NULL; - Error *local_err = NULL; - bool use_chs; - uint8_t buf[HEADER_SIZE]; - uint32_t checksum; - uint64_t computed_size; - uint64_t pagetable_size; - int disk_type = VHD_DYNAMIC; - int ret; - - opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort); - qemu_opts_absorb_qdict(opts, options, &local_err); - if (local_err) { - error_propagate(errp, local_err); - ret = -EINVAL; - goto fail; - } - - vpc_parse_options(bs, opts, &local_err); - if (local_err) { - error_propagate(errp, local_err); - ret = -EINVAL; - goto fail; - } - - ret = bdrv_pread(bs->file->bs, 0, s->footer_buf, HEADER_SIZE); - if (ret < 0) { - error_setg(errp, "Unable to read VHD header"); - goto fail; - } - - footer = (VHDFooter *) s->footer_buf; - if (strncmp(footer->creator, "conectix", 8)) { - int64_t offset = bdrv_getlength(bs->file->bs); - if (offset < 0) { - ret = offset; - error_setg(errp, "Invalid file size"); - goto fail; - } else if (offset < HEADER_SIZE) { - ret = -EINVAL; - error_setg(errp, "File too small for a VHD header"); - goto fail; - } - - /* If a fixed disk, the footer is found only at the end of the file */ - ret = bdrv_pread(bs->file->bs, offset-HEADER_SIZE, s->footer_buf, - HEADER_SIZE); - if (ret < 0) { - goto fail; - } - if (strncmp(footer->creator, "conectix", 8)) { - error_setg(errp, "invalid VPC image"); - ret = -EINVAL; - goto fail; - } - disk_type = VHD_FIXED; - } - - checksum = be32_to_cpu(footer->checksum); - footer->checksum = 0; - if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) - fprintf(stderr, "block-vpc: The header checksum of '%s' is " - "incorrect.\n", bs->filename); - - /* Write 'checksum' back to footer, or else will leave it with zero. */ - footer->checksum = cpu_to_be32(checksum); - - /* The visible size of a image in Virtual PC depends on the geometry - rather than on the size stored in the footer (the size in the footer - is too large usually) */ - bs->total_sectors = (int64_t) - be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; - - /* Microsoft Virtual PC and Microsoft Hyper-V produce and read - * VHD image sizes differently. VPC will rely on CHS geometry, - * while Hyper-V and disk2vhd use the size specified in the footer. - * - * We use a couple of approaches to try and determine the correct method: - * look at the Creator App field, and look for images that have CHS - * geometry that is the maximum value. - * - * If the CHS geometry is the maximum CHS geometry, then we assume that - * the size is the footer->current_size to avoid truncation. Otherwise, - * we follow the table based on footer->creator_app: - * - * Known creator apps: - * 'vpc ' : CHS Virtual PC (uses disk geometry) - * 'qemu' : CHS QEMU (uses disk geometry) - * 'qem2' : current_size QEMU (uses current_size) - * 'win ' : current_size Hyper-V - * 'd2v ' : current_size Disk2vhd - * 'tap\0' : current_size XenServer - * 'CTXS' : current_size XenConverter - * - * The user can override the table values via drive options, however - * even with an override we will still use current_size for images - * that have CHS geometry of the maximum size. - */ - use_chs = (!!strncmp(footer->creator_app, "win ", 4) && - !!strncmp(footer->creator_app, "qem2", 4) && - !!strncmp(footer->creator_app, "d2v ", 4) && - !!strncmp(footer->creator_app, "CTXS", 4) && - !!memcmp(footer->creator_app, "tap", 4)) || s->force_use_chs; - - if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) { - bs->total_sectors = be64_to_cpu(footer->current_size) / - BDRV_SECTOR_SIZE; - } - - /* Allow a maximum disk size of 2040 GiB */ - if (bs->total_sectors > VHD_MAX_SECTORS) { - ret = -EFBIG; - goto fail; - } - - if (disk_type == VHD_DYNAMIC) { - ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf, - HEADER_SIZE); - if (ret < 0) { - error_setg(errp, "Error reading dynamic VHD header"); - goto fail; - } - - dyndisk_header = (VHDDynDiskHeader *) buf; - - if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { - error_setg(errp, "Invalid header magic"); - ret = -EINVAL; - goto fail; - } - - s->block_size = be32_to_cpu(dyndisk_header->block_size); - if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { - error_setg(errp, "Invalid block size %" PRIu32, s->block_size); - ret = -EINVAL; - goto fail; - } - s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; - - s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); - - if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { - error_setg(errp, "Too many blocks"); - ret = -EINVAL; - goto fail; - } - - computed_size = (uint64_t) s->max_table_entries * s->block_size; - if (computed_size < bs->total_sectors * 512) { - error_setg(errp, "Page table too small"); - ret = -EINVAL; - goto fail; - } - - if (s->max_table_entries > SIZE_MAX / 4 || - s->max_table_entries > (int) INT_MAX / 4) { - error_setg(errp, "Max Table Entries too large (%" PRId32 ")", - s->max_table_entries); - ret = -EINVAL; - goto fail; - } - - pagetable_size = (uint64_t) s->max_table_entries * 4; - - s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); - if (s->pagetable == NULL) { - error_setg(errp, "Unable to allocate memory for page table"); - ret = -ENOMEM; - goto fail; - } - - s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); - - ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable, - pagetable_size); - if (ret < 0) { - error_setg(errp, "Error reading pagetable"); - goto fail; - } - - s->free_data_block_offset = - ROUND_UP(s->bat_offset + pagetable_size, 512); - - for (i = 0; i < s->max_table_entries; i++) { - be32_to_cpus(&s->pagetable[i]); - if (s->pagetable[i] != 0xFFFFFFFF) { - int64_t next = (512 * (int64_t) s->pagetable[i]) + - s->bitmap_size + s->block_size; - - if (next > s->free_data_block_offset) { - s->free_data_block_offset = next; - } - } - } - - if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) { - error_setg(errp, "block-vpc: free_data_block_offset points after " - "the end of file. The image has been truncated."); - ret = -EINVAL; - goto fail; - } - - s->last_bitmap_offset = (int64_t) -1; - -#ifdef CACHE - s->pageentry_u8 = g_malloc(512); - s->pageentry_u32 = s->pageentry_u8; - s->pageentry_u16 = s->pageentry_u8; - s->last_pagetable = -1; -#endif - } - - qemu_co_mutex_init(&s->lock); - - /* Disable migration when VHD images are used */ - error_setg(&s->migration_blocker, "The vpc format used by node '%s' " - "does not support live migration", - bdrv_get_device_or_node_name(bs)); - migrate_add_blocker(s->migration_blocker); - - return 0; - -fail: - qemu_vfree(s->pagetable); -#ifdef CACHE - g_free(s->pageentry_u8); -#endif - return ret; -} - -static int vpc_reopen_prepare(BDRVReopenState *state, - BlockReopenQueue *queue, Error **errp) -{ - return 0; -} - -/* - * Returns the absolute byte offset of the given sector in the image file. - * If the sector is not allocated, -1 is returned instead. - * - * The parameter write must be 1 if the offset will be used for a write - * operation (the block bitmaps is updated then), 0 otherwise. - */ -static inline int64_t get_sector_offset(BlockDriverState *bs, - int64_t sector_num, int write) -{ - BDRVVPCState *s = bs->opaque; - uint64_t offset = sector_num * 512; - uint64_t bitmap_offset, block_offset; - uint32_t pagetable_index, pageentry_index; - - pagetable_index = offset / s->block_size; - pageentry_index = (offset % s->block_size) / 512; - - if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) - return -1; /* not allocated */ - - bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; - block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); - - /* We must ensure that we don't write to any sectors which are marked as - unused in the bitmap. We get away with setting all bits in the block - bitmap each time we write to a new block. This might cause Virtual PC to - miss sparse read optimization, but it's not a problem in terms of - correctness. */ - if (write && (s->last_bitmap_offset != bitmap_offset)) { - uint8_t bitmap[s->bitmap_size]; - - s->last_bitmap_offset = bitmap_offset; - memset(bitmap, 0xff, s->bitmap_size); - bdrv_pwrite_sync(bs->file->bs, bitmap_offset, bitmap, s->bitmap_size); - } - - return block_offset; -} - -/* - * Writes the footer to the end of the image file. This is needed when the - * file grows as it overwrites the old footer - * - * Returns 0 on success and < 0 on error - */ -static int rewrite_footer(BlockDriverState* bs) -{ - int ret; - BDRVVPCState *s = bs->opaque; - int64_t offset = s->free_data_block_offset; - - ret = bdrv_pwrite_sync(bs->file->bs, offset, s->footer_buf, HEADER_SIZE); - if (ret < 0) - return ret; - - return 0; -} - -/* - * Allocates a new block. This involves writing a new footer and updating - * the Block Allocation Table to use the space at the old end of the image - * file (overwriting the old footer) - * - * Returns the sectors' offset in the image file on success and < 0 on error - */ -static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) -{ - BDRVVPCState *s = bs->opaque; - int64_t bat_offset; - uint32_t index, bat_value; - int ret; - uint8_t bitmap[s->bitmap_size]; - - /* Check if sector_num is valid */ - if ((sector_num < 0) || (sector_num > bs->total_sectors)) - return -1; - - /* Write entry into in-memory BAT */ - index = (sector_num * 512) / s->block_size; - if (s->pagetable[index] != 0xFFFFFFFF) - return -1; - - s->pagetable[index] = s->free_data_block_offset / 512; - - /* Initialize the block's bitmap */ - memset(bitmap, 0xff, s->bitmap_size); - ret = bdrv_pwrite_sync(bs->file->bs, s->free_data_block_offset, bitmap, - s->bitmap_size); - if (ret < 0) { - return ret; - } - - /* Write new footer (the old one will be overwritten) */ - s->free_data_block_offset += s->block_size + s->bitmap_size; - ret = rewrite_footer(bs); - if (ret < 0) - goto fail; - - /* Write BAT entry to disk */ - bat_offset = s->bat_offset + (4 * index); - bat_value = cpu_to_be32(s->pagetable[index]); - ret = bdrv_pwrite_sync(bs->file->bs, bat_offset, &bat_value, 4); - if (ret < 0) - goto fail; - - return get_sector_offset(bs, sector_num, 0); - -fail: - s->free_data_block_offset -= (s->block_size + s->bitmap_size); - return -1; -} - -static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) -{ - BDRVVPCState *s = (BDRVVPCState *)bs->opaque; - VHDFooter *footer = (VHDFooter *) s->footer_buf; - - if (be32_to_cpu(footer->type) != VHD_FIXED) { - bdi->cluster_size = s->block_size; - } - - bdi->unallocated_blocks_are_zero = true; - return 0; -} - -static int vpc_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - BDRVVPCState *s = bs->opaque; - int ret; - int64_t offset; - int64_t sectors, sectors_per_block; - VHDFooter *footer = (VHDFooter *) s->footer_buf; - - if (be32_to_cpu(footer->type) == VHD_FIXED) { - return bdrv_read(bs->file->bs, sector_num, buf, nb_sectors); - } - while (nb_sectors > 0) { - offset = get_sector_offset(bs, sector_num, 0); - - sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; - sectors = sectors_per_block - (sector_num % sectors_per_block); - if (sectors > nb_sectors) { - sectors = nb_sectors; - } - - if (offset == -1) { - memset(buf, 0, sectors * BDRV_SECTOR_SIZE); - } else { - ret = bdrv_pread(bs->file->bs, offset, buf, - sectors * BDRV_SECTOR_SIZE); - if (ret != sectors * BDRV_SECTOR_SIZE) { - return -1; - } - } - - nb_sectors -= sectors; - sector_num += sectors; - buf += sectors * BDRV_SECTOR_SIZE; - } - return 0; -} - -static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - int ret; - BDRVVPCState *s = bs->opaque; - qemu_co_mutex_lock(&s->lock); - ret = vpc_read(bs, sector_num, buf, nb_sectors); - qemu_co_mutex_unlock(&s->lock); - return ret; -} - -static int vpc_write(BlockDriverState *bs, int64_t sector_num, - const uint8_t *buf, int nb_sectors) -{ - BDRVVPCState *s = bs->opaque; - int64_t offset; - int64_t sectors, sectors_per_block; - int ret; - VHDFooter *footer = (VHDFooter *) s->footer_buf; - - if (be32_to_cpu(footer->type) == VHD_FIXED) { - return bdrv_write(bs->file->bs, sector_num, buf, nb_sectors); - } - while (nb_sectors > 0) { - offset = get_sector_offset(bs, sector_num, 1); - - sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; - sectors = sectors_per_block - (sector_num % sectors_per_block); - if (sectors > nb_sectors) { - sectors = nb_sectors; - } - - if (offset == -1) { - offset = alloc_block(bs, sector_num); - if (offset < 0) - return -1; - } - - ret = bdrv_pwrite(bs->file->bs, offset, buf, - sectors * BDRV_SECTOR_SIZE); - if (ret != sectors * BDRV_SECTOR_SIZE) { - return -1; - } - - nb_sectors -= sectors; - sector_num += sectors; - buf += sectors * BDRV_SECTOR_SIZE; - } - - return 0; -} - -static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, - const uint8_t *buf, int nb_sectors) -{ - int ret; - BDRVVPCState *s = bs->opaque; - qemu_co_mutex_lock(&s->lock); - ret = vpc_write(bs, sector_num, buf, nb_sectors); - qemu_co_mutex_unlock(&s->lock); - return ret; -} - -static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs, - int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) -{ - BDRVVPCState *s = bs->opaque; - VHDFooter *footer = (VHDFooter*) s->footer_buf; - int64_t start, offset; - bool allocated; - int n; - - if (be32_to_cpu(footer->type) == VHD_FIXED) { - *pnum = nb_sectors; - *file = bs->file->bs; - return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | - (sector_num << BDRV_SECTOR_BITS); - } - - offset = get_sector_offset(bs, sector_num, 0); - start = offset; - allocated = (offset != -1); - *pnum = 0; - - do { - /* All sectors in a block are contiguous (without using the bitmap) */ - n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE) - - sector_num; - n = MIN(n, nb_sectors); - - *pnum += n; - sector_num += n; - nb_sectors -= n; - /* *pnum can't be greater than one block for allocated - * sectors since there is always a bitmap in between. */ - if (allocated) { - *file = bs->file->bs; - return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start; - } - if (nb_sectors == 0) { - break; - } - offset = get_sector_offset(bs, sector_num, 0); - } while (offset == -1); - - return 0; -} - -/* - * Calculates the number of cylinders, heads and sectors per cylinder - * based on a given number of sectors. This is the algorithm described - * in the VHD specification. - * - * Note that the geometry doesn't always exactly match total_sectors but - * may round it down. - * - * Returns 0 on success, -EFBIG if the size is larger than 2040 GiB. Override - * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) - * and instead allow up to 255 heads. - */ -static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, - uint8_t* heads, uint8_t* secs_per_cyl) -{ - uint32_t cyls_times_heads; - - total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY); - - if (total_sectors >= 65535LL * 16 * 63) { - *secs_per_cyl = 255; - *heads = 16; - cyls_times_heads = total_sectors / *secs_per_cyl; - } else { - *secs_per_cyl = 17; - cyls_times_heads = total_sectors / *secs_per_cyl; - *heads = (cyls_times_heads + 1023) / 1024; - - if (*heads < 4) { - *heads = 4; - } - - if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { - *secs_per_cyl = 31; - *heads = 16; - cyls_times_heads = total_sectors / *secs_per_cyl; - } - - if (cyls_times_heads >= (*heads * 1024)) { - *secs_per_cyl = 63; - *heads = 16; - cyls_times_heads = total_sectors / *secs_per_cyl; - } - } - - *cyls = cyls_times_heads / *heads; - - return 0; -} - -static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, - int64_t total_sectors) -{ - VHDDynDiskHeader *dyndisk_header = - (VHDDynDiskHeader *) buf; - size_t block_size, num_bat_entries; - int i; - int ret; - int64_t offset = 0; - - /* 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); - - ret = blk_pwrite(blk, offset, buf, HEADER_SIZE); - if (ret < 0) { - goto fail; - } - - offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); - ret = blk_pwrite(blk, offset, buf, HEADER_SIZE); - if (ret < 0) { - goto fail; - } - - /* Write the initial BAT */ - offset = 3 * 512; - - memset(buf, 0xFF, 512); - for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { - ret = blk_pwrite(blk, offset, buf, 512); - if (ret < 0) { - goto fail; - } - offset += 512; - } - - /* Prepare the Dynamic Disk Header */ - memset(buf, 0, 1024); - - memcpy(dyndisk_header->magic, "cxsparse", 8); - - /* - * Note: The spec is actually wrong here for data_offset, it says - * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. - */ - dyndisk_header->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); - dyndisk_header->table_offset = cpu_to_be64(3 * 512); - dyndisk_header->version = cpu_to_be32(0x00010000); - dyndisk_header->block_size = cpu_to_be32(block_size); - dyndisk_header->max_table_entries = cpu_to_be32(num_bat_entries); - - dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024)); - - /* Write the header */ - offset = 512; - - ret = blk_pwrite(blk, offset, buf, 1024); - if (ret < 0) { - goto fail; - } - - fail: - return ret; -} - -static int create_fixed_disk(BlockBackend *blk, uint8_t *buf, - int64_t total_size) -{ - int ret; - - /* Add footer to total size */ - total_size += HEADER_SIZE; - - ret = blk_truncate(blk, total_size); - if (ret < 0) { - return ret; - } - - ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE); - if (ret < 0) { - return ret; - } - - return ret; -} - -static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) -{ - uint8_t buf[1024]; - VHDFooter *footer = (VHDFooter *) buf; - char *disk_type_param; - int i; - uint16_t cyls = 0; - uint8_t heads = 0; - uint8_t secs_per_cyl = 0; - int64_t total_sectors; - int64_t total_size; - int disk_type; - int ret = -EIO; - bool force_size; - Error *local_err = NULL; - BlockBackend *blk = NULL; - - /* Read out options */ - total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), - BDRV_SECTOR_SIZE); - disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); - if (disk_type_param) { - if (!strcmp(disk_type_param, "dynamic")) { - disk_type = VHD_DYNAMIC; - } else if (!strcmp(disk_type_param, "fixed")) { - disk_type = VHD_FIXED; - } else { - error_setg(errp, "Invalid disk type, %s", disk_type_param); - ret = -EINVAL; - goto out; - } - } else { - disk_type = VHD_DYNAMIC; - } - - force_size = qemu_opt_get_bool_del(opts, VPC_OPT_FORCE_SIZE, false); - - ret = bdrv_create_file(filename, opts, &local_err); - if (ret < 0) { - error_propagate(errp, local_err); - goto out; - } - - blk = blk_new_open(filename, NULL, NULL, - BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); - if (blk == NULL) { - error_propagate(errp, local_err); - ret = -EIO; - goto out; - } - - blk_set_allow_write_beyond_eof(blk, true); - - /* - * Calculate matching total_size and geometry. Increase the number of - * sectors requested until we get enough (or fail). This ensures that - * qemu-img convert doesn't truncate images, but rather rounds up. - * - * If the image size can't be represented by a spec conformant CHS geometry, - * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use - * the image size from the VHD footer to calculate total_sectors. - */ - if (force_size) { - /* This will force the use of total_size for sector count, below */ - cyls = VHD_CHS_MAX_C; - heads = VHD_CHS_MAX_H; - secs_per_cyl = VHD_CHS_MAX_S; - } else { - total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE); - for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { - calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl); - } - } - - if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) { - total_sectors = total_size / BDRV_SECTOR_SIZE; - /* Allow a maximum disk size of 2040 GiB */ - if (total_sectors > VHD_MAX_SECTORS) { - error_setg(errp, "Disk size is too large, max size is 2040 GiB"); - ret = -EFBIG; - goto out; - } - } else { - total_sectors = (int64_t)cyls * heads * secs_per_cyl; - total_size = total_sectors * BDRV_SECTOR_SIZE; - } - - /* Prepare the Hard Disk Footer */ - memset(buf, 0, 1024); - - memcpy(footer->creator, "conectix", 8); - if (force_size) { - memcpy(footer->creator_app, "qem2", 4); - } else { - memcpy(footer->creator_app, "qemu", 4); - } - memcpy(footer->creator_os, "Wi2k", 4); - - footer->features = cpu_to_be32(0x02); - footer->version = cpu_to_be32(0x00010000); - if (disk_type == VHD_DYNAMIC) { - footer->data_offset = cpu_to_be64(HEADER_SIZE); - } else { - footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); - } - footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); - - /* Version of Virtual PC 2007 */ - footer->major = cpu_to_be16(0x0005); - footer->minor = cpu_to_be16(0x0003); - footer->orig_size = cpu_to_be64(total_size); - footer->current_size = cpu_to_be64(total_size); - footer->cyls = cpu_to_be16(cyls); - footer->heads = heads; - footer->secs_per_cyl = secs_per_cyl; - - footer->type = cpu_to_be32(disk_type); - -#if defined(CONFIG_UUID) - uuid_generate(footer->uuid); -#endif - - footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE)); - - if (disk_type == VHD_DYNAMIC) { - ret = create_dynamic_disk(blk, buf, total_sectors); - } else { - ret = create_fixed_disk(blk, buf, total_size); - } - if (ret < 0) { - error_setg(errp, "Unable to create or write VHD header"); - } - -out: - blk_unref(blk); - g_free(disk_type_param); - return ret; -} - -static int vpc_has_zero_init(BlockDriverState *bs) -{ - BDRVVPCState *s = bs->opaque; - VHDFooter *footer = (VHDFooter *) s->footer_buf; - - if (be32_to_cpu(footer->type) == VHD_FIXED) { - return bdrv_has_zero_init(bs->file->bs); - } else { - return 1; - } -} - -static void vpc_close(BlockDriverState *bs) -{ - BDRVVPCState *s = bs->opaque; - qemu_vfree(s->pagetable); -#ifdef CACHE - g_free(s->pageentry_u8); -#endif - - migrate_del_blocker(s->migration_blocker); - error_free(s->migration_blocker); -} - -static QemuOptsList vpc_create_opts = { - .name = "vpc-create-opts", - .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), - .desc = { - { - .name = BLOCK_OPT_SIZE, - .type = QEMU_OPT_SIZE, - .help = "Virtual disk size" - }, - { - .name = BLOCK_OPT_SUBFMT, - .type = QEMU_OPT_STRING, - .help = - "Type of virtual hard disk format. Supported formats are " - "{dynamic (default) | fixed} " - }, - { - .name = VPC_OPT_FORCE_SIZE, - .type = QEMU_OPT_BOOL, - .help = "Force disk size calculation to use the actual size " - "specified, rather than using the nearest CHS-based " - "calculation" - }, - { /* end of list */ } - } -}; - -static BlockDriver bdrv_vpc = { - .format_name = "vpc", - .instance_size = sizeof(BDRVVPCState), - - .bdrv_probe = vpc_probe, - .bdrv_open = vpc_open, - .bdrv_close = vpc_close, - .bdrv_reopen_prepare = vpc_reopen_prepare, - .bdrv_create = vpc_create, - - .bdrv_read = vpc_co_read, - .bdrv_write = vpc_co_write, - .bdrv_co_get_block_status = vpc_co_get_block_status, - - .bdrv_get_info = vpc_get_info, - - .create_opts = &vpc_create_opts, - .bdrv_has_zero_init = vpc_has_zero_init, -}; - -static void bdrv_vpc_init(void) -{ - bdrv_register(&bdrv_vpc); -} - -block_init(bdrv_vpc_init); |