g_raid_lock_range
int g_raid_lock_range(struct g_raid_volume *vol, off_t off, off_t len,
g_raid_lock_range(sd->sd_volume, /* Lock callback starts I/O */
g_raid_lock_range(sd->sd_volume,
g_raid_lock_range(sd->sd_volume,
g_raid_lock_range(sd->sd_volume, virtual, len, NULL, bp);