/*----------------------------------------------------------------- * We need to keep track of which region a bio is doing io for. * To avoid a memory allocation to store just 5 or 6 bits, we * ensure the 'struct io' pointer is aligned so enough low bits are * always zero and then combine it with the region number directly in * bi_private. *---------------------------------------------------------------*/ static void store_io_and_region_in_bio(struct bio *bio, struct io *io, unsigned region) { if (unlikely(!IS_ALIGNED((unsigned long)io, DM_IO_MAX_REGIONS))) { DMCRIT("Unaligned struct io pointer %p", io); BUG(); } bio->bi_private = (void *)((unsigned long)io | region); }
void dm_unregister_target(struct target_type *tt) { down_write(&_lock); if (!__find_target_type(tt->name)) { DMCRIT("Unregistering unrecognised target: %s", tt->name); BUG(); } list_del(&tt->list); up_write(&_lock); }