diff --git a/block/vpc.c b/block/vpc.c index 9475efb660e04403d0734a6cf85c3f9728b10760..3e2ea698d979846613cc7cf94899136fdc6f9fb0 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -45,7 +45,7 @@ enum vhd_type { VHD_DIFFERENCING = 4, }; -// Seconds since Jan 1, 2000 0:00:00 (UTC) +/* Seconds since Jan 1, 2000 0:00:00 (UTC) */ #define VHD_TIMESTAMP_BASE 946684800 #define VHD_CHS_MAX_C 65535LL @@ -57,22 +57,22 @@ enum vhd_type { #define VPC_OPT_FORCE_SIZE "force_size" -// always big-endian +/* always big-endian */ typedef struct vhd_footer { - char creator[8]; // "conectix" + char creator[8]; /* "conectix" */ uint32_t features; uint32_t version; - // Offset of next header structure, 0xFFFFFFFF if none + /* Offset of next header structure, 0xFFFFFFFF if none */ uint64_t data_offset; - // Seconds since Jan 1, 2000 0:00:00 (UTC) + /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ uint32_t timestamp; - char creator_app[4]; // "vpc " + char creator_app[4]; /* e.g., "vpc " */ uint16_t major; uint16_t minor; - char creator_os[4]; // "Wi2k" + char creator_os[4]; /* "Wi2k" */ uint64_t orig_size; uint64_t current_size; @@ -83,29 +83,29 @@ typedef struct vhd_footer { 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") + /* 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) + /* 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" + char magic[8]; /* "cxsparse" */ - // Offset of next header structure, 0xFFFFFFFF if none + /* Offset of next header structure, 0xFFFFFFFF if none */ uint64_t data_offset; - // Offset of the Block Allocation Table (BAT) + /* Offset of the Block Allocation Table (BAT) */ uint64_t table_offset; uint32_t version; - uint32_t max_table_entries; // 32bit/entry + uint32_t max_table_entries; /* 32bit/entry */ - // 2 MB by default, must be a power of two + /* 2 MB by default, must be a power of two */ uint32_t block_size; uint32_t checksum; @@ -113,7 +113,7 @@ typedef struct vhd_dyndisk_header { uint32_t parent_timestamp; uint32_t reserved; - // Backing file name (in UTF-16) + /* Backing file name (in UTF-16) */ uint8_t parent_name[512]; struct { @@ -278,9 +278,9 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, /* 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) + /* 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; @@ -466,16 +466,16 @@ static inline int64_t get_sector_offset(BlockDriverState *bs, pageentry_index = (offset % s->block_size) / 512; if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) - return -1; // not allocated + 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. + /* 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]; @@ -521,18 +521,18 @@ static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) int ret; uint8_t bitmap[s->bitmap_size]; - // Check if sector_num is valid + /* Check if sector_num is valid */ if ((sector_num < 0) || (sector_num > bs->total_sectors)) return -1; - // Write entry into in-memory BAT + /* 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 + /* 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); @@ -540,13 +540,13 @@ static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) return ret; } - // Write new footer (the old one will be overwritten) + /* 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 + /* 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); @@ -779,7 +779,7 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, int ret; int64_t offset = 0; - // Write the footer (twice: at the beginning and at the end) + /* 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); @@ -794,7 +794,7 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, goto fail; } - // Write the initial BAT + /* Write the initial BAT */ offset = 3 * 512; memset(buf, 0xFF, 512); @@ -806,7 +806,7 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, offset += 512; } - // Prepare the Dynamic Disk Header + /* Prepare the Dynamic Disk Header */ memset(buf, 0, 1024); memcpy(dyndisk_header->magic, "cxsparse", 8); @@ -823,7 +823,7 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024)); - // Write the header + /* Write the header */ offset = 512; ret = blk_pwrite(blk, offset, buf, 1024);