196 	struct cow_header_v3 *header;  in write_cow_header()  local
207 	header = cow_malloc(sizeof(*header));  in write_cow_header()
208 	if (header == NULL) {  in write_cow_header()
213 	header->magic = htonl(COW_MAGIC);  in write_cow_header()
214 	header->version = htonl(COW_VERSION);  in write_cow_header()
217 	if (strlen(backing_file) > sizeof(header->backing_file) - 1) {  in write_cow_header()
221 			   sizeof(header->backing_file) - 1);  in write_cow_header()
225 	if (absolutize(header->backing_file, sizeof(header->backing_file),  in write_cow_header()
229 	err = os_file_modtime(header->backing_file, &modtime);  in write_cow_header()
232 			   "request failed, err = %d\n", header->backing_file,  in write_cow_header()
237 	err = cow_file_size(header->backing_file, size);  in write_cow_header()
241 			   header->backing_file, -err);  in write_cow_header()
245 	header->mtime = htonl(modtime);  in write_cow_header()
246 	header->size = htonll(*size);  in write_cow_header()
247 	header->sectorsize = htonl(sectorsize);  in write_cow_header()
248 	header->alignment = htonl(alignment);  in write_cow_header()
249 	header->cow_format = COW_BITMAP;  in write_cow_header()
251 	err = cow_write_file(fd, header, sizeof(*header));  in write_cow_header()
252 	if (err != sizeof(*header)) {  in write_cow_header()
260 	cow_free(header);  in write_cow_header()
280 	union cow_header *header;  in read_cow_header()  local
285 	header = cow_malloc(sizeof(*header));  in read_cow_header()
286 	if (header == NULL) {  in read_cow_header()
291 	n = (*reader)(0, (char *) header, sizeof(*header), arg);  in read_cow_header()
292 	if (n < offsetof(typeof(header->v1), backing_file)) {  in read_cow_header()
297 	magic = header->v1.magic;  in read_cow_header()
299 		version = header->v1.version;  in read_cow_header()
301 		version = ntohl(header->v1.version);  in read_cow_header()
308 		if (n < sizeof(header->v1)) {  in read_cow_header()
313 		*mtime_out = header->v1.mtime;  in read_cow_header()
314 		*size_out = header->v1.size;  in read_cow_header()
315 		*sectorsize_out = header->v1.sectorsize;  in read_cow_header()
316 		*bitmap_offset_out = sizeof(header->v1);  in read_cow_header()
318 		file = header->v1.backing_file;  in read_cow_header()
321 		if (n < sizeof(header->v2)) {  in read_cow_header()
326 		*mtime_out = ntohl(header->v2.mtime);  in read_cow_header()
327 		*size_out = ntohll(header->v2.size);  in read_cow_header()
328 		*sectorsize_out = ntohl(header->v2.sectorsize);  in read_cow_header()
329 		*bitmap_offset_out = sizeof(header->v2);  in read_cow_header()
331 		file = header->v2.backing_file;  in read_cow_header()
334 	else if (version == 3 && (*((int*)header->v3.backing_file) != 0)) {  in read_cow_header()
335 		if (n < sizeof(header->v3)) {  in read_cow_header()
340 		*mtime_out = ntohl(header->v3.mtime);  in read_cow_header()
341 		*size_out = ntohll(header->v3.size);  in read_cow_header()
342 		*sectorsize_out = ntohl(header->v3.sectorsize);  in read_cow_header()
343 		*align_out = ntohl(header->v3.alignment);  in read_cow_header()
348 		*bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out);  in read_cow_header()
349 		file = header->v3.backing_file;  in read_cow_header()
355 		if (n < sizeof(header->v3_b)) {  in read_cow_header()
370 		*mtime_out = (time32_t) ntohl(header->v3_b.mtime);  in read_cow_header()
372 		*size_out = ntohll(header->v3_b.size);  in read_cow_header()
373 		*sectorsize_out = ntohl(header->v3_b.sectorsize);  in read_cow_header()
374 		*align_out = ntohl(header->v3_b.alignment);  in read_cow_header()
379 		*bitmap_offset_out = ROUND_UP(sizeof(header->v3_b), *align_out);  in read_cow_header()
380 		file = header->v3_b.backing_file;  in read_cow_header()
395 	cow_free(header);  in read_cow_header()