diff options
Diffstat (limited to 'block')
-rw-r--r-- | block/nfs.c | 2 | ||||
-rw-r--r-- | block/vpc.c | 146 |
2 files changed, 73 insertions, 75 deletions
diff --git a/block/nfs.c b/block/nfs.c index 77905f5..8c1968b 100644 --- a/block/nfs.c +++ b/block/nfs.c @@ -592,7 +592,7 @@ static int64_t nfs_client_open_qdict(NFSClient *client, QDict *options, int flags, int open_flags, Error **errp) { BlockdevOptionsNfs *opts; - int ret; + int64_t ret; opts = nfs_options_qdict_to_qapi(options, errp); if (opts == NULL) { diff --git a/block/vpc.c b/block/vpc.c index 1ab55f9..17a705b 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -39,8 +39,6 @@ /**************************************************************/ -#define HEADER_SIZE 512 - //#define CACHE enum vhd_type { @@ -95,8 +93,11 @@ typedef struct vhd_footer { QemuUUID uuid; uint8_t in_saved_state; + uint8_t reserved[427]; } QEMU_PACKED VHDFooter; +QEMU_BUILD_BUG_ON(sizeof(VHDFooter) != 512); + typedef struct vhd_dyndisk_header { char magic[8]; /* "cxsparse" */ @@ -127,11 +128,14 @@ typedef struct vhd_dyndisk_header { uint32_t reserved; uint64_t data_offset; } parent_locator[8]; + uint8_t reserved2[256]; } QEMU_PACKED VHDDynDiskHeader; +QEMU_BUILD_BUG_ON(sizeof(VHDDynDiskHeader) != 1024); + typedef struct BDRVVPCState { CoMutex lock; - uint8_t footer_buf[HEADER_SIZE]; + VHDFooter footer; uint64_t free_data_block_offset; int max_table_entries; uint32_t *pagetable; @@ -172,8 +176,9 @@ static QemuOptsList vpc_runtime_opts = { static QemuOptsList vpc_create_opts; -static uint32_t vpc_checksum(uint8_t *buf, size_t size) +static uint32_t vpc_checksum(void *p, size_t size) { + uint8_t *buf = p; uint32_t res = 0; int i; @@ -216,11 +221,10 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, 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]; + VHDDynDiskHeader dyndisk_header; uint32_t checksum; uint64_t computed_size; uint64_t pagetable_size; @@ -247,28 +251,28 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, goto fail; } - ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE); + ret = bdrv_pread(bs->file, 0, &s->footer, sizeof(s->footer)); if (ret < 0) { error_setg(errp, "Unable to read VHD header"); goto fail; } - footer = (VHDFooter *) s->footer_buf; + footer = &s->footer; 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) { + } else if (offset < sizeof(*footer)) { 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, offset-HEADER_SIZE, s->footer_buf, - HEADER_SIZE); + ret = bdrv_pread(bs->file, offset - sizeof(*footer), + footer, sizeof(*footer)); if (ret < 0) { goto fail; } @@ -282,7 +286,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, checksum = be32_to_cpu(footer->checksum); footer->checksum = 0; - if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) { + if (vpc_checksum(footer, sizeof(*footer)) != checksum) { error_setg(errp, "Incorrect header checksum"); ret = -EINVAL; goto fail; @@ -340,22 +344,20 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, } if (disk_type == VHD_DYNAMIC) { - ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, - HEADER_SIZE); + ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), + &dyndisk_header, sizeof(dyndisk_header)); if (ret < 0) { error_setg(errp, "Error reading dynamic VHD header"); goto fail; } - dyndisk_header = (VHDDynDiskHeader *) buf; - - if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { + 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); + 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; @@ -363,7 +365,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, } s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; - s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); + 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"); @@ -395,7 +397,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, goto fail; } - s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); + s->bat_offset = be64_to_cpu(dyndisk_header.table_offset); ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable, pagetable_size); @@ -534,7 +536,7 @@ static int rewrite_footer(BlockDriverState *bs) BDRVVPCState *s = bs->opaque; int64_t offset = s->free_data_block_offset; - ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); + ret = bdrv_pwrite_sync(bs->file, offset, &s->footer, sizeof(s->footer)); if (ret < 0) return ret; @@ -597,9 +599,8 @@ fail: 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) { + if (be32_to_cpu(s->footer.type) != VHD_FIXED) { bdi->cluster_size = s->block_size; } @@ -615,10 +616,9 @@ vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, int64_t image_offset; int64_t n_bytes; int64_t bytes_done = 0; - VHDFooter *footer = (VHDFooter *) s->footer_buf; QEMUIOVector local_qiov; - if (be32_to_cpu(footer->type) == VHD_FIXED) { + if (be32_to_cpu(s->footer.type) == VHD_FIXED) { return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0); } @@ -666,10 +666,9 @@ vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, int64_t n_bytes; int64_t bytes_done = 0; int ret = 0; - VHDFooter *footer = (VHDFooter *) s->footer_buf; QEMUIOVector local_qiov; - if (be32_to_cpu(footer->type) == VHD_FIXED) { + if (be32_to_cpu(s->footer.type) == VHD_FIXED) { return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0); } @@ -723,13 +722,12 @@ static int coroutine_fn vpc_co_block_status(BlockDriverState *bs, BlockDriverState **file) { BDRVVPCState *s = bs->opaque; - VHDFooter *footer = (VHDFooter*) s->footer_buf; int64_t image_offset; bool allocated; int ret; int64_t n; - if (be32_to_cpu(footer->type) == VHD_FIXED) { + if (be32_to_cpu(s->footer.type) == VHD_FIXED) { *pnum = bytes; *map = offset; *file = bs->file->bs; @@ -819,11 +817,11 @@ static int calculate_geometry(int64_t total_sectors, uint16_t *cyls, return 0; } -static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, +static int create_dynamic_disk(BlockBackend *blk, VHDFooter *footer, int64_t total_sectors) { - VHDDynDiskHeader *dyndisk_header = - (VHDDynDiskHeader *) buf; + VHDDynDiskHeader dyndisk_header; + uint8_t bat_sector[512]; size_t block_size, num_bat_entries; int i; int ret; @@ -833,13 +831,13 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, block_size = 0x200000; num_bat_entries = DIV_ROUND_UP(total_sectors, block_size / 512); - ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0); + ret = blk_pwrite(blk, offset, footer, sizeof(*footer), 0); if (ret < 0) { goto fail; } offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); - ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0); + ret = blk_pwrite(blk, offset, footer, sizeof(*footer), 0); if (ret < 0) { goto fail; } @@ -847,9 +845,9 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, /* Write the initial BAT */ offset = 3 * 512; - memset(buf, 0xFF, 512); + memset(bat_sector, 0xFF, 512); for (i = 0; i < DIV_ROUND_UP(num_bat_entries * 4, 512); i++) { - ret = blk_pwrite(blk, offset, buf, 512, 0); + ret = blk_pwrite(blk, offset, bat_sector, 512, 0); if (ret < 0) { goto fail; } @@ -857,26 +855,27 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, } /* Prepare the Dynamic Disk Header */ - memset(buf, 0, 1024); + memset(&dyndisk_header, 0, sizeof(dyndisk_header)); - memcpy(dyndisk_header->magic, "cxsparse", 8); + 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.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)); + dyndisk_header.checksum = cpu_to_be32( + vpc_checksum(&dyndisk_header, sizeof(dyndisk_header))); /* Write the header */ offset = 512; - ret = blk_pwrite(blk, offset, buf, 1024, 0); + ret = blk_pwrite(blk, offset, &dyndisk_header, sizeof(dyndisk_header), 0); if (ret < 0) { goto fail; } @@ -886,20 +885,21 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, return ret; } -static int create_fixed_disk(BlockBackend *blk, uint8_t *buf, +static int create_fixed_disk(BlockBackend *blk, VHDFooter *footer, int64_t total_size, Error **errp) { int ret; /* Add footer to total size */ - total_size += HEADER_SIZE; + total_size += sizeof(*footer); ret = blk_truncate(blk, total_size, false, PREALLOC_MODE_OFF, 0, errp); if (ret < 0) { return ret; } - ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE, 0); + ret = blk_pwrite(blk, total_size - sizeof(*footer), + footer, sizeof(*footer), 0); if (ret < 0) { error_setg_errno(errp, -ret, "Unable to write VHD header"); return ret; @@ -971,8 +971,7 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts, BlockBackend *blk = NULL; BlockDriverState *bs = NULL; - uint8_t buf[1024]; - VHDFooter *footer = (VHDFooter *) buf; + VHDFooter footer; uint16_t cyls = 0; uint8_t heads = 0; uint8_t secs_per_cyl = 0; @@ -1035,48 +1034,48 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts, } /* Prepare the Hard Disk Footer */ - memset(buf, 0, 1024); + memset(&footer, 0, sizeof(footer)); - memcpy(footer->creator, "conectix", 8); + memcpy(footer.creator, "conectix", 8); if (vpc_opts->force_size) { - memcpy(footer->creator_app, "qem2", 4); + memcpy(footer.creator_app, "qem2", 4); } else { - memcpy(footer->creator_app, "qemu", 4); + memcpy(footer.creator_app, "qemu", 4); } - memcpy(footer->creator_os, "Wi2k", 4); + memcpy(footer.creator_os, "Wi2k", 4); - footer->features = cpu_to_be32(0x02); - footer->version = cpu_to_be32(0x00010000); + 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); + footer.data_offset = cpu_to_be64(sizeof(footer)); } else { - footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); + footer.data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); } - footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); + 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.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); + footer.type = cpu_to_be32(disk_type); qemu_uuid_generate(&uuid); - footer->uuid = uuid; + footer.uuid = uuid; - footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE)); + footer.checksum = cpu_to_be32(vpc_checksum(&footer, sizeof(footer))); if (disk_type == VHD_DYNAMIC) { - ret = create_dynamic_disk(blk, buf, total_sectors); + ret = create_dynamic_disk(blk, &footer, total_sectors); if (ret < 0) { error_setg(errp, "Unable to create or write VHD header"); } } else { - ret = create_fixed_disk(blk, buf, total_size, errp); + ret = create_fixed_disk(blk, &footer, total_size, errp); } out: @@ -1170,9 +1169,8 @@ fail: 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) { + if (be32_to_cpu(s->footer.type) == VHD_FIXED) { return bdrv_has_zero_init(bs->file->bs); } else { return 1; |