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()
293 	memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in zero_memory_area()
314 	if (!ps->store->chunk_size) {  in read_header()
315 		ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,  in read_header()
316 		    bdev_logical_block_size(dm_snap_cow(ps->store->snap)->  in read_header()
318 		ps->store->chunk_mask = ps->store->chunk_size - 1;  in read_header()
319 		ps->store->chunk_shift = __ffs(ps->store->chunk_size);  in read_header()
353 	if (ps->store->chunk_size == chunk_size)  in read_header()
359 		       chunk_size, ps->store->chunk_size);  in read_header()
364 	r = dm_exception_store_set_chunk_size(ps->store, chunk_size,  in read_header()
384 	memset(ps->header_area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in write_header()
390 	dh->chunk_size = cpu_to_le32(ps->store->chunk_size);  in write_header()
494 	client = dm_bufio_client_create(dm_snap_cow(ps->store->snap)->bdev,  in read_exceptions()
495 					ps->store->chunk_size << SECTOR_SHIFT,  in read_exceptions()
540 			memcpy(ps->area, area, ps->store->chunk_size << SECTOR_SHIFT);  in read_exceptions()
562 static struct pstore *get_info(struct dm_exception_store *store)  in get_info()  argument
564 	return (struct pstore *) store->context;  in get_info()
567 static void persistent_usage(struct dm_exception_store *store,  in persistent_usage()  argument
572 	struct pstore *ps = get_info(store);  in persistent_usage()
574 	*sectors_allocated = ps->next_free * store->chunk_size;  in persistent_usage()
575 	*total_sectors = get_dev_size(dm_snap_cow(store->snap)->bdev);  in persistent_usage()
583 			    store->chunk_size;  in persistent_usage()
586 static void persistent_dtr(struct dm_exception_store *store)  in persistent_dtr()  argument
588 	struct pstore *ps = get_info(store);  in persistent_dtr()
603 static int persistent_read_metadata(struct dm_exception_store *store,  in persistent_read_metadata()  argument
609 	struct pstore *ps = get_info(store);  in persistent_read_metadata()
621 	ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /  in persistent_read_metadata()
668 static int persistent_prepare_exception(struct dm_exception_store *store,  in persistent_prepare_exception()  argument
671 	struct pstore *ps = get_info(store);  in persistent_prepare_exception()
672 	sector_t size = get_dev_size(dm_snap_cow(store->snap)->bdev);  in persistent_prepare_exception()
675 	if (size < ((ps->next_free + 1) * store->chunk_size))  in persistent_prepare_exception()
691 static void persistent_commit_exception(struct dm_exception_store *store,  in persistent_commit_exception()  argument
697 	struct pstore *ps = get_info(store);  in persistent_commit_exception()
757 static int persistent_prepare_merge(struct dm_exception_store *store,  in persistent_prepare_merge()  argument
761 	struct pstore *ps = get_info(store);  in persistent_prepare_merge()
803 static int persistent_commit_merge(struct dm_exception_store *store,  in persistent_commit_merge()  argument
807 	struct pstore *ps = get_info(store);  in persistent_commit_merge()
836 static void persistent_drop_snapshot(struct dm_exception_store *store)  in persistent_drop_snapshot()  argument
838 	struct pstore *ps = get_info(store);  in persistent_drop_snapshot()
845 static int persistent_ctr(struct dm_exception_store *store, char *options)  in persistent_ctr()  argument
855 	ps->store = store;  in persistent_ctr()
878 			store->userspace_supports_overflow = true;  in persistent_ctr()
880 			DMERR("Unsupported persistent store option: %s", options);  in persistent_ctr()
886 	store->context = ps;  in persistent_ctr()
898 static unsigned persistent_status(struct dm_exception_store *store,  in persistent_status()  argument
908 		DMEMIT(" %s %llu", store->userspace_supports_overflow ? "PO" : "P",  in persistent_status()
909 		       (unsigned long long)store->chunk_size);  in persistent_status()
955 		DMERR("Unable to register persistent exception store type");  in dm_persistent_snapshot_init()
962 		      "store type");  in dm_persistent_snapshot_init()