diff options
| -rw-r--r-- | block/vpc.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/block/vpc.c b/block/vpc.c index f14c6ae196..566e9a3b37 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -201,7 +201,8 @@ static int vpc_open(BlockDriverState *bs, int flags) bs->total_sectors = (int64_t) be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; - if (bs->total_sectors >= 65535 * 16 * 255) { + /* Allow a maximum disk size of approximately 2 TB */ + if (bs->total_sectors >= 65535LL * 255 * 255) { err = -EFBIG; goto fail; } @@ -527,19 +528,27 @@ static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, * 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 127 GB + * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. 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; - if (total_sectors > 65535 * 16 * 255) + /* Allow a maximum disk size of approximately 2 TB */ + if (total_sectors > 65535LL * 255 * 255) { return -EFBIG; + } if (total_sectors > 65535 * 16 * 63) { *secs_per_cyl = 255; - *heads = 16; + if (total_sectors > 65535 * 16 * 255) { + *heads = 255; + } else { + *heads = 16; + } cyls_times_heads = total_sectors / *secs_per_cyl; } else { *secs_per_cyl = 17; |