1 // SPDX-License-Identifier: GPL-2.0-only
15  * match_dev_by_uuid - callback for finding a partition using its uuid
26 	if (!bdev->bd_meta_info ||  in match_dev_by_uuid()
27 	    strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len))  in match_dev_by_uuid()
33  * devt_from_partuuid - looks up the dev_t of a partition by its UUID
41  * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be
56 	/* Check for optional partition number offset attributes. */  in devt_from_partuuid()
63 		cmp.len = slash - uuid_str;  in devt_from_partuuid()
73 		return -ENODEV;  in devt_from_partuuid()
78 		 * to the partition number found by UUID.  in devt_from_partuuid()
81 				  dev_to_bdev(dev)->bd_partno + offset);  in devt_from_partuuid()
83 		*devt = dev->devt;  in devt_from_partuuid()
91 	       "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");  in devt_from_partuuid()
92 	return -EINVAL;  in devt_from_partuuid()
96  * match_dev_by_label - callback for finding a partition using its label
107 	if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname))  in match_dev_by_label()
118 		return -ENODEV;  in devt_from_partlabel()
119 	*devt = dev->devt;  in devt_from_partlabel()
137 		if (partno < disk->minors) {  in blk_lookup_devt()
141 			devt = MKDEV(MAJOR(dev->devt),  in blk_lookup_devt()
142 				     MINOR(dev->devt) + partno);  in blk_lookup_devt()
155 	int part;  in devt_from_devname()  local
160 		return -EINVAL;  in devt_from_devname()
172 	 * Try non-existent, but valid partition, which may only exist after  in devt_from_devname()
175 	while (p > s && isdigit(p[-1]))  in devt_from_devname()
176 		p--;  in devt_from_devname()
178 		return -ENODEV;  in devt_from_devname()
180 	/* try disk name without <part number> */  in devt_from_devname()
181 	part = simple_strtoul(p, NULL, 10);  in devt_from_devname()
183 	*devt = blk_lookup_devt(s, part);  in devt_from_devname()
187 	/* try disk name without p<part number> */  in devt_from_devname()
188 	if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')  in devt_from_devname()
189 		return -ENODEV;  in devt_from_devname()
190 	p[-1] = '\0';  in devt_from_devname()
191 	*devt = blk_lookup_devt(s, part);  in devt_from_devname()
194 	return -ENODEV;  in devt_from_devname()
206 			return -EINVAL;  in devt_from_devnum()
210 			return -EINVAL;  in devt_from_devnum()
217  *	Convert a name into device number.  We accept the following variants:
219  *	1) <hex_major><hex_minor> device number in hexadecimal represents itself
221  *	3) /dev/<disk_name> represents the device number of disk
222  *	4) /dev/<disk_name><decimal> represents the device number
223  *         of partition - device number of disk plus the partition number
224  *	5) /dev/<disk_name>p<decimal> - same as the above, that form is
226  *	6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
229  *	   partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
230  *	   filled hex representation of the 32-bit "NT disk signature", and PP
231  *	   is a zero-filled hex representation of the 1-based partition number.
234  *	8) <major>:<minor> major and minor number of the device separated by
260 		snprintf(buf, BDEVT_SIZE, "%-9s", tbuf);  in bdevt_str()
268  * print a full list of all partitions - intended for places where the root
280 		struct block_device *part;  in printk_all_partitions()  local
288 		if (get_capacity(disk) == 0 || (disk->flags & GENHD_FL_HIDDEN))  in printk_all_partitions()
293 		 * hex - the same format as the root= option takes.  in printk_all_partitions()
296 		xa_for_each(&disk->part_tbl, idx, part) {  in printk_all_partitions()
297 			if (!bdev_nr_sectors(part))  in printk_all_partitions()
300 			       bdev_is_partition(part) ? "  " : "",  in printk_all_partitions()
301 			       bdevt_str(part->bd_dev, devt_buf),  in printk_all_partitions()
302 			       bdev_nr_sectors(part) >> 1, part,  in printk_all_partitions()
303 			       part->bd_meta_info ?  in printk_all_partitions()
304 					part->bd_meta_info->uuid : "");  in printk_all_partitions()
305 			if (bdev_is_partition(part))  in printk_all_partitions()
307 			else if (dev->parent && dev->parent->driver)  in printk_all_partitions()
309 					dev->parent->driver->name);  in printk_all_partitions()