btrfs_sysfs_add_device 3106 fs/btrfs/disk-io.c 	ret = btrfs_sysfs_add_device(fs_devices);
btrfs_sysfs_add_device   23 fs/btrfs/sysfs.h int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);