9 #include "dm-exception-store.h"
33  * We need to store a record of which parts of the origin have
36  * of the COW store.  It makes sense therefore, to store the
103  * The top level structure for a persistent exception store.
106 	struct dm_exception_store *store;  member
142 	 * the exception store because chunks can be committed out of
175 	len = ps->store->chunk_size << SECTOR_SHIFT;  in alloc_area()
236 		.bdev = dm_snap_cow(ps->store->snap)->bdev,  in chunk_io()
237 		.sector = ps->store->chunk_size * chunk,  in chunk_io()
238 		.count = ps->store->chunk_size,  in chunk_io()
297 	memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in zero_memory_area()
318 	if (!ps->store->chunk_size) {  in read_header()
319 		ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,  in read_header()
320 		    bdev_logical_block_size(dm_snap_cow(ps->store->snap)->  in read_header()
322 		ps->store->chunk_mask = ps->store->chunk_size - 1;  in read_header()
323 		ps->store->chunk_shift = __ffs(ps->store->chunk_size);  in read_header()
357 	if (ps->store->chunk_size == chunk_size)  in read_header()
362 		       chunk_size, ps->store->chunk_size);  in read_header()
367 	r = dm_exception_store_set_chunk_size(ps->store, chunk_size,  in read_header()
387 	memset(ps->header_area, 0, ps->store->chunk_size << SECTOR_SHIFT);  in write_header()
393 	dh->chunk_size = cpu_to_le32(ps->store->chunk_size);  in write_header()
497 	client = dm_bufio_client_create(dm_snap_cow(ps->store->snap)->bdev,  in read_exceptions()
498 					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 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()
763 static int persistent_prepare_merge(struct dm_exception_store *store,  in persistent_prepare_merge()  argument
767 	struct pstore *ps = get_info(store);  in persistent_prepare_merge()
809 static int persistent_commit_merge(struct dm_exception_store *store,  in persistent_commit_merge()  argument
813 	struct pstore *ps = get_info(store);  in persistent_commit_merge()
842 static void persistent_drop_snapshot(struct dm_exception_store *store)  in persistent_drop_snapshot()  argument
844 	struct pstore *ps = get_info(store);  in persistent_drop_snapshot()
851 static int persistent_ctr(struct dm_exception_store *store, char *options)  in persistent_ctr()  argument
861 	ps->store = store;  in persistent_ctr()
885 			store->userspace_supports_overflow = true;  in persistent_ctr()
887 			DMERR("Unsupported persistent store option: %s", options);  in persistent_ctr()
893 	store->context = ps;  in persistent_ctr()
905 static unsigned int persistent_status(struct dm_exception_store *store,  in persistent_status()  argument
915 		DMEMIT(" %s %llu", store->userspace_supports_overflow ? "PO" : "P",  in persistent_status()
916 		       (unsigned long long)store->chunk_size);  in persistent_status()
962 		DMERR("Unable to register persistent exception store type");  in dm_persistent_snapshot_init()
968 		DMERR("Unable to register old-style persistent exception store type");  in dm_persistent_snapshot_init()