um/drivers/ubd_kern.c

132 	/* backing file name */
133 	char *file;
134 	/* backing file fd */
145 	/* name (and fd, below) of the file opened for writing, either the
146 	 * backing or the cow file. */
147 	char *file;
164 	.file =			NULL, \
172 	.file = 		NULL, \
230 	char *file, *backing_file, *serial;
260 	if(ubd_dev->file != NULL){
304 	file = strsep(&str, ",:");
305 	if (*file == '\0')
306 		file = NULL;
317 		*error_out = "Can't specify both 'd' and a cow file";
322 	ubd_dev->file = file;
323 	ubd_dev->cow.file = backing_file;
346 "    This is used to associate a device with a file in the underlying\n"
348 "    COW name and the second is the backing file name. As separator you can\n"
353 "    a COW file or a backing file. To override this detection, add the 'd'\n"
356 "    Usually, there is a filesystem in the file, but \n"
358 "    specified like this. Also, a file which doesn't contain a\n"
365 "    UMLs and file locking will be turned off - this is appropriate for a\n"
372 "    an empty string, in which case the backing file is not used:\n"
373 "       ubd0=File,,Serial\n"
489 	char *file;
501 	if (ubd_dev->file && ubd_dev->cow.file) {
502 		file = ubd_dev->cow.file;
507 	fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
516 		file = ubd_dev->file;
518 		file = backing_file;
521 	return os_file_size(file, size_out);
535 static int backing_file_mismatch(char *file, __u64 size, time64_t mtime)
541 	err = os_file_modtime(file, &modtime);
544 		       "file \"%s\", err = %d\n", file, -err);
548 	err = os_file_size(file, &actual);
550 		printk(KERN_ERR "Failed to get size of backing file \"%s\", "
551 		       "err = %d\n", file, -err);
559 		       "vs backing file\n", (unsigned long long) size, actual);
564 		       "backing file\n", mtime, modtime);
595 	printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
601 static int open_ubd_file(char *file, struct openflags *openflags, int shared,
612 	fd = os_open_file(file, *openflags, mode);
620 		fd = os_open_file(file, *openflags, mode);
626 		printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
631 			       file, -err);
643 		printk(KERN_ERR "Failed to read COW header from COW file "
644 		       "\"%s\", errno = %d\n", file, -err);
651 					    file);
656 		printk(KERN_ERR "Switching backing file to '%s'\n",
658 		err = write_cow_header(file, fd, *backing_file_out,
691 		printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
709 	if(ubd_dev->cow.file == NULL)
726 	create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL;
727 	back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file;
729 	fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared,
735 		fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
741 			printk(KERN_INFO "Creating \"%s\" as COW file for "
742 			       "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file);
747 		printk("Failed to open '%s', errno = %d\n", ubd_dev->file,
753 	if(ubd_dev->cow.file != NULL){
769 		err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL,
840 	if(ubd_dev->file == NULL)
843 	if (ubd_dev->cow.file)
852 		*error_out = "Couldn't determine size of device's file";
859 			'a' + n, ubd_dev->file, -err);
940 		ubd_devs[n].file = NULL;
965 	if(ubd_dev->file == NULL){
970 	CONFIG_CHUNK(str, size, len, ubd_dev->file, 0);
972 	if(ubd_dev->cow.file != NULL){
974 		CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1);
1002 	if(ubd_dev->file == NULL)
1048 	if(ubd_dev->file == NULL)
1049 		ubd_dev->file = "root_fs";
1217 	if (dev->cow.file) {
1241 	if (dev->cow.file)
1421 		/* fds[0] is always either the rw image or our cow file */