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;
}
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;
}
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->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;
}
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;
}
ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable,
pagetable_size);
if (ret < 0) {
+ error_setg(errp, "Error reading pagetable");
goto fail;
}