8 #include "dm-exception-store.h"
30  * We need to store a record of which parts of the origin have
33  * of the COW store.  It makes sense therefore, to store the
100  * The top level structure for a persistent exception store.
103 	struct dm_exception_store *store;  member
139 	 * the exception store because chunks can be committed out of
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()
301 	memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in zero_memory_area()
322 	if (!ps->store->chunk_size) {  in read_header()
323 		ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,  in read_header()
324 		    bdev_logical_block_size(dm_snap_cow(ps->store->snap)->  in read_header()
326 		ps->store->chunk_mask = ps->store->chunk_size - 1;  in read_header()
327 		ps->store->chunk_shift = __ffs(ps->store->chunk_size);  in read_header()
361 	if (ps->store->chunk_size == chunk_size)  in read_header()
367 		       chunk_size, ps->store->chunk_size);  in read_header()
372 	r = dm_exception_store_set_chunk_size(ps->store, chunk_size,  in read_header()
392 	memset(ps->header_area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in write_header()
398 	dh->chunk_size = cpu_to_le32(ps->store->chunk_size);  in write_header()
502 	client = dm_bufio_client_create(dm_snap_cow(ps->store->snap)->bdev,  in read_exceptions()
503 					ps->store->chunk_size << SECTOR_SHIFT,  in read_exceptions()
548 			memcpy(ps->area, area, ps->store->chunk_size << SECTOR_SHIFT);  in read_exceptions()
570 static struct pstore *get_info(struct dm_exception_store *store)  in get_info()  argument
572 	return (struct pstore *) store->context;  in get_info()
575 static void persistent_usage(struct dm_exception_store *store,  in persistent_usage()  argument
580 	struct pstore *ps = get_info(store);  in persistent_usage()
582 	*sectors_allocated = ps->next_free * store->chunk_size;  in persistent_usage()
583 	*total_sectors = get_dev_size(dm_snap_cow(store->snap)->bdev);  in persistent_usage()
591 			    store->chunk_size;  in persistent_usage()
594 static void persistent_dtr(struct dm_exception_store *store)  in persistent_dtr()  argument
596 	struct pstore *ps = get_info(store);  in persistent_dtr()
611 static int persistent_read_metadata(struct dm_exception_store *store,  in persistent_read_metadata()  argument
617 	struct pstore *ps = get_info(store);  in persistent_read_metadata()
629 	ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /  in persistent_read_metadata()
676 static int persistent_prepare_exception(struct dm_exception_store *store,  in persistent_prepare_exception()  argument
679 	struct pstore *ps = get_info(store);  in persistent_prepare_exception()
680 	sector_t size = get_dev_size(dm_snap_cow(store->snap)->bdev);  in persistent_prepare_exception()
683 	if (size < ((ps->next_free + 1) * store->chunk_size))  in persistent_prepare_exception()
699 static void persistent_commit_exception(struct dm_exception_store *store,  in persistent_commit_exception()  argument
705 	struct pstore *ps = get_info(store);  in persistent_commit_exception()
765 static int persistent_prepare_merge(struct dm_exception_store *store,  in persistent_prepare_merge()  argument
769 	struct pstore *ps = get_info(store);  in persistent_prepare_merge()
811 static int persistent_commit_merge(struct dm_exception_store *store,  in persistent_commit_merge()  argument
815 	struct pstore *ps = get_info(store);  in persistent_commit_merge()
844 static void persistent_drop_snapshot(struct dm_exception_store *store)  in persistent_drop_snapshot()  argument
846 	struct pstore *ps = get_info(store);  in persistent_drop_snapshot()
853 static int persistent_ctr(struct dm_exception_store *store, char *options)  in persistent_ctr()  argument
863 	ps->store = store;  in persistent_ctr()
886 			store->userspace_supports_overflow = true;  in persistent_ctr()
888 			DMERR("Unsupported persistent store option: %s", options);  in persistent_ctr()
894 	store->context = ps;  in persistent_ctr()
906 static unsigned persistent_status(struct dm_exception_store *store,  in persistent_status()  argument
916 		DMEMIT(" %s %llu", store->userspace_supports_overflow ? "PO" : "P",  in persistent_status()
917 		       (unsigned long long)store->chunk_size);  in persistent_status()
959 		DMERR("Unable to register persistent exception store type");  in dm_persistent_snapshot_init()
966 		      "store type");  in dm_persistent_snapshot_init()