fs/btrfs/volumes.c

470 		      struct btrfs_super_block **disk_super)
491 	*disk_super = btrfs_read_dev_super(bdev);
492 	if (IS_ERR(*disk_super)) {
493 		ret = PTR_ERR(*disk_super);
568 					struct btrfs_super_block *disk_super,
573 	const bool has_metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
578 	fsid_fs_devices = find_fsid(disk_super->fsid,
579 		    has_metadata_uuid ? disk_super->metadata_uuid : NULL);
582 	if (btrfs_super_num_devices(disk_super) != 1)
590 	if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING)
645 	struct btrfs_super_block *disk_super;
655 				    &bdev_file, &disk_super);
659 	devid = btrfs_stack_device_id(&disk_super->dev_item);
663 	if (memcmp(device->uuid, disk_super->dev_item.uuid, BTRFS_UUID_SIZE))
666 	device->generation = btrfs_super_generation(disk_super);
668 	if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) {
669 		if (btrfs_super_incompat_flags(disk_super) &
711 	btrfs_release_disk_super(disk_super);
716 	btrfs_release_disk_super(disk_super);
738 			   struct btrfs_super_block *disk_super,
744 	u64 found_transid = btrfs_super_generation(disk_super);
745 	u64 devid = btrfs_stack_device_id(&disk_super->dev_item);
749 	bool has_metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
752 	if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
766 	fs_devices = find_fsid_by_device(disk_super, path_devt, &same_fsid_diff_dev);
769 		fs_devices = alloc_fs_devices(disk_super->fsid);
775 			       disk_super->metadata_uuid, BTRFS_FSID_SIZE);
792 			.uuid = disk_super->dev_item.uuid,
799 			memcpy(fs_devices->fsid, disk_super->fsid,
802 			       btrfs_sb_fsid_ptr(disk_super), BTRFS_FSID_SIZE);
821 					    disk_super->dev_item.uuid, path);
837 		if (disk_super->label[0])
840 				disk_super->label, devid, found_transid, path,
846 				disk_super->fsid, devid, found_transid, path,
944 	fs_devices->total_devices = btrfs_super_num_devices(disk_super);
1271 	struct btrfs_super_block *disk_super;
1281 	if (sizeof(*disk_super) > PAGE_SIZE)
1286 	if ((bytenr + sizeof(*disk_super) - 1) >> PAGE_SHIFT != index)
1298 	disk_super = p + offset_in_page(bytenr);
1300 	if (btrfs_super_bytenr(disk_super) != bytenr_orig ||
1301 	    btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
1306 	if (disk_super->label[0] && disk_super->label[BTRFS_LABEL_SIZE - 1])
1307 		disk_super->label[BTRFS_LABEL_SIZE - 1] = 0;
1309 	return disk_super;
1323 static bool btrfs_skip_registration(struct btrfs_super_block *disk_super,
1357 	if (!mount_arg_dev && btrfs_super_num_devices(disk_super) == 1 &&
1358 	    !(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING))
1376 	struct btrfs_super_block *disk_super;
1414 	disk_super = btrfs_read_disk_super(file_bdev(bdev_file), bytenr,
1416 	if (IS_ERR(disk_super)) {
1417 		device = ERR_CAST(disk_super);
1422 	if (btrfs_skip_registration(disk_super, path, devt, mount_arg_dev)) {
1432 	device = device_list_add(path, disk_super, &new_device_added);
1437 	btrfs_release_disk_super(disk_super);
2072 	struct btrfs_super_block *disk_super;
2073 	const size_t len = sizeof(disk_super->magic);
2077 	disk_super = btrfs_read_disk_super(bdev, bytenr, bytenr);
2078 	if (IS_ERR(disk_super))
2081 	memset(&disk_super->magic, 0, len);
2082 	folio_mark_dirty(virt_to_folio(disk_super));
2083 	btrfs_release_disk_super(disk_super);
2387 	struct btrfs_super_block *disk_super;
2406 				    &bdev_file, &disk_super);
2412 	args->devid = btrfs_stack_device_id(&disk_super->dev_item);
2413 	memcpy(args->uuid, disk_super->dev_item.uuid, BTRFS_UUID_SIZE);
2415 		memcpy(args->fsid, disk_super->metadata_uuid, BTRFS_FSID_SIZE);
2417 		memcpy(args->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
2418 	btrfs_release_disk_super(disk_super);
2511 	struct btrfs_super_block *disk_super = fs_info->super_copy;
2549 	memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
2551 	super_flags = btrfs_super_flags(disk_super) &
2553 	btrfs_set_super_flags(disk_super, super_flags);