103 	struct dm_exception_store *store;  member
172 	len = ps->store->chunk_size << SECTOR_SHIFT;  in alloc_area()
233 		.bdev = dm_snap_cow(ps->store->snap)->bdev,  in chunk_io()
234 		.sector = ps->store->chunk_size * chunk,  in chunk_io()
235 		.count = ps->store->chunk_size,  in chunk_io()
300 	memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in zero_memory_area()
320 	if (!ps->store->chunk_size) {  in read_header()
321 		ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,  in read_header()
322 		    bdev_logical_block_size(dm_snap_cow(ps->store->snap)->  in read_header()
324 		ps->store->chunk_mask = ps->store->chunk_size - 1;  in read_header()
325 		ps->store->chunk_shift = __ffs(ps->store->chunk_size);  in read_header()
359 	if (ps->store->chunk_size == chunk_size)  in read_header()
365 		       chunk_size, ps->store->chunk_size);  in read_header()
370 	r = dm_exception_store_set_chunk_size(ps->store, chunk_size,  in read_header()
390 	memset(ps->header_area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in write_header()
396 	dh->chunk_size = cpu_to_le32(ps->store->chunk_size);  in write_header()
500 	client = dm_bufio_client_create(dm_snap_cow(ps->store->snap)->bdev,  in read_exceptions()
501 					ps->store->chunk_size << SECTOR_SHIFT,  in read_exceptions()
546 			memcpy(ps->area, area, ps->store->chunk_size << SECTOR_SHIFT);  in read_exceptions()
568 static struct pstore *get_info(struct dm_exception_store *store)  in get_info()  argument
570 	return (struct pstore *) store->context;  in get_info()
573 static void persistent_usage(struct dm_exception_store *store,  in persistent_usage()  argument
578 	struct pstore *ps = get_info(store);  in persistent_usage()
580 	*sectors_allocated = ps->next_free * store->chunk_size;  in persistent_usage()
581 	*total_sectors = get_dev_size(dm_snap_cow(store->snap)->bdev);  in persistent_usage()
589 			    store->chunk_size;  in persistent_usage()
592 static void persistent_dtr(struct dm_exception_store *store)  in persistent_dtr()  argument
594 	struct pstore *ps = get_info(store);  in persistent_dtr()
609 static int persistent_read_metadata(struct dm_exception_store *store,  in persistent_read_metadata()  argument
615 	struct pstore *ps = get_info(store);  in persistent_read_metadata()
627 	ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /  in persistent_read_metadata()
674 static int persistent_prepare_exception(struct dm_exception_store *store,  in persistent_prepare_exception()  argument
677 	struct pstore *ps = get_info(store);  in persistent_prepare_exception()
678 	sector_t size = get_dev_size(dm_snap_cow(store->snap)->bdev);  in persistent_prepare_exception()
681 	if (size < ((ps->next_free + 1) * store->chunk_size))  in persistent_prepare_exception()
697 static void persistent_commit_exception(struct dm_exception_store *store,  in persistent_commit_exception()  argument
703 	struct pstore *ps = get_info(store);  in persistent_commit_exception()
762 static int persistent_prepare_merge(struct dm_exception_store *store,  in persistent_prepare_merge()  argument
766 	struct pstore *ps = get_info(store);  in persistent_prepare_merge()
808 static int persistent_commit_merge(struct dm_exception_store *store,  in persistent_commit_merge()  argument
812 	struct pstore *ps = get_info(store);  in persistent_commit_merge()
841 static void persistent_drop_snapshot(struct dm_exception_store *store)  in persistent_drop_snapshot()  argument
843 	struct pstore *ps = get_info(store);  in persistent_drop_snapshot()
850 static int persistent_ctr(struct dm_exception_store *store, char *options)  in persistent_ctr()  argument
860 	ps->store = store;  in persistent_ctr()
883 			store->userspace_supports_overflow = true;  in persistent_ctr()
891 	store->context = ps;  in persistent_ctr()
903 static unsigned persistent_status(struct dm_exception_store *store,  in persistent_status()  argument
913 		DMEMIT(" %s %llu", store->userspace_supports_overflow ? "PO" : "P",  in persistent_status()
914 		       (unsigned long long)store->chunk_size);  in persistent_status()