1 // SPDX-License-Identifier: GPL-2.0-only
71  * match_dev_by_uuid - callback for finding a partition using its uuid
80 	struct hd_struct *part = dev_to_part(dev);  in match_dev_by_uuid()  local
82 	if (!part->info)  in match_dev_by_uuid()
85 	if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len))  in match_dev_by_uuid()
95  * devt_from_partuuid - looks up the dev_t of a partition by its UUID
102  * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be
113 	struct hd_struct *part;  in devt_from_partuuid()  local
121 	/* Check for optional partition number offset attributes. */  in devt_from_partuuid()
130 		cmp.len = slash - uuid_str;  in devt_from_partuuid()
145 	res = dev->devt;  in devt_from_partuuid()
153 	part = disk_get_part(disk, dev_to_part(dev)->partno + offset);  in devt_from_partuuid()
154 	if (part) {  in devt_from_partuuid()
155 		res = part_devt(part);  in devt_from_partuuid()
156 		put_device(part_to_dev(part));  in devt_from_partuuid()
164 		       "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");  in devt_from_partuuid()
173  * match_dev_by_label - callback for finding a partition using its label
182 	struct hd_struct *part = dev_to_part(dev);  in match_dev_by_label()  local
184 	if (part->info && !strcmp(label, part->info->volname))  in match_dev_by_label()
192  *	Convert a name into device number.  We accept the following variants:
194  *	1) <hex_major><hex_minor> device number in hexadecimal represents itself
197  *	3) /dev/<disk_name> represents the device number of disk
198  *	4) /dev/<disk_name><decimal> represents the device number
199  *         of partition - device number of disk plus the partition number
200  *	5) /dev/<disk_name>p<decimal> - same as the above, that form is
202  *	6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
205  *	   partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
206  *	   filled hex representation of the 32-bit "NT disk signature", and PP
207  *	   is a zero-filled hex representation of the 1-based partition number.
210  *	8) <major>:<minor> major and minor number of the device separated by
227 	int part;  in name_to_dev_t()  local
244 		res = dev->devt;  in name_to_dev_t()
289 	 * try non-existent, but valid partition, which may only exist  in name_to_dev_t()
292 	while (p > s && isdigit(p[-1]))  in name_to_dev_t()
293 		p--;  in name_to_dev_t()
297 	/* try disk name without <part number> */  in name_to_dev_t()
298 	part = simple_strtoul(p, NULL, 10);  in name_to_dev_t()
300 	res = blk_lookup_devt(s, part);  in name_to_dev_t()
304 	/* try disk name without p<part number> */  in name_to_dev_t()
305 	if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')  in name_to_dev_t()
307 	p[-1] = '\0';  in name_to_dev_t()
308 	res = blk_lookup_devt(s, part);  in name_to_dev_t()
369 			if (s[-1] == ',')  in get_fs_names()
370 				s[-1] = '\0';  in get_fs_names()
377 		for (p = page-1; p; p = next) {  in get_fs_names()
383 			s[-1] = '\0';  in get_fs_names()
401 			return -ENOMEM;  in do_mount_root()
403 		/* zero-pad. init_mount() will make sure it's terminated */  in do_mount_root()
412 	s = current->fs->pwd.dentry->d_sb;  in do_mount_root()
413 	ROOT_DEV = s->s_dev;  in do_mount_root()
416 	       s->s_type->name,  in do_mount_root()
433 	scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)",  in mount_block_root()
442 			case -EACCES:  in mount_block_root()
443 			case -EINVAL:  in mount_block_root()
582  * Prepare the namespace - decide what/where to mount, load ramdisks, etc.