70 static int compression_compress_pages(int type, struct list_head *ws,  in compression_compress_pages()  argument
77 		return zlib_compress_pages(ws, mapping, start, pages,  in compression_compress_pages()
80 		return lzo_compress_pages(ws, mapping, start, pages,  in compression_compress_pages()
83 		return zstd_compress_pages(ws, mapping, start, pages,  in compression_compress_pages()
101 static int compression_decompress_bio(struct list_head *ws,  in compression_decompress_bio()  argument
105 	case BTRFS_COMPRESS_ZLIB: return zlib_decompress_bio(ws, cb);  in compression_decompress_bio()
106 	case BTRFS_COMPRESS_LZO:  return lzo_decompress_bio(ws, cb);  in compression_decompress_bio()
107 	case BTRFS_COMPRESS_ZSTD: return zstd_decompress_bio(ws, cb);  in compression_decompress_bio()
118 static int compression_decompress(int type, struct list_head *ws,  in compression_decompress()  argument
123 	case BTRFS_COMPRESS_ZLIB: return zlib_decompress(ws, data_in, dest_page,  in compression_decompress()
125 	case BTRFS_COMPRESS_LZO:  return lzo_decompress(ws, data_in, dest_page,  in compression_decompress()
127 	case BTRFS_COMPRESS_ZSTD: return zstd_decompress(ws, data_in, dest_page,  in compression_decompress()
884 static void free_heuristic_ws(struct list_head *ws)  in free_heuristic_ws()  argument
888 	workspace = list_entry(ws, struct heuristic_ws, list);  in free_heuristic_ws()
898 	struct heuristic_ws *ws;  in alloc_heuristic_ws()  local
900 	ws = kzalloc(sizeof(*ws), GFP_KERNEL);  in alloc_heuristic_ws()
901 	if (!ws)  in alloc_heuristic_ws()
904 	ws->sample = kvmalloc(MAX_SAMPLE_SIZE, GFP_KERNEL);  in alloc_heuristic_ws()
905 	if (!ws->sample)  in alloc_heuristic_ws()
908 	ws->bucket = kcalloc(BUCKET_SIZE, sizeof(*ws->bucket), GFP_KERNEL);  in alloc_heuristic_ws()
909 	if (!ws->bucket)  in alloc_heuristic_ws()
912 	ws->bucket_b = kcalloc(BUCKET_SIZE, sizeof(*ws->bucket_b), GFP_KERNEL);  in alloc_heuristic_ws()
913 	if (!ws->bucket_b)  in alloc_heuristic_ws()
916 	INIT_LIST_HEAD(&ws->list);  in alloc_heuristic_ws()
917 	return &ws->list;  in alloc_heuristic_ws()
919 	free_heuristic_ws(&ws->list);  in alloc_heuristic_ws()
951 static void free_workspace(int type, struct list_head *ws)  in free_workspace()  argument
954 	case BTRFS_COMPRESS_NONE: return free_heuristic_ws(ws);  in free_workspace()
955 	case BTRFS_COMPRESS_ZLIB: return zlib_free_workspace(ws);  in free_workspace()
956 	case BTRFS_COMPRESS_LZO:  return lzo_free_workspace(ws);  in free_workspace()
957 	case BTRFS_COMPRESS_ZSTD: return zstd_free_workspace(ws);  in free_workspace()
996 	struct list_head *ws;  in btrfs_cleanup_workspace_manager()  local
1000 		ws = wsman->idle_ws.next;  in btrfs_cleanup_workspace_manager()
1001 		list_del(ws);  in btrfs_cleanup_workspace_manager()
1002 		free_workspace(type, ws);  in btrfs_cleanup_workspace_manager()
1112 void btrfs_put_workspace(int type, struct list_head *ws)  in btrfs_put_workspace()  argument
1130 		list_add(ws, idle_ws);  in btrfs_put_workspace()
1137 	free_workspace(type, ws);  in btrfs_put_workspace()
1143 static void put_workspace(int type, struct list_head *ws)  in put_workspace()  argument
1146 	case BTRFS_COMPRESS_NONE: return btrfs_put_workspace(type, ws);  in put_workspace()
1147 	case BTRFS_COMPRESS_ZLIB: return btrfs_put_workspace(type, ws);  in put_workspace()
1148 	case BTRFS_COMPRESS_LZO:  return btrfs_put_workspace(type, ws);  in put_workspace()
1149 	case BTRFS_COMPRESS_ZSTD: return zstd_put_workspace(ws);  in put_workspace()
1376 static u32 shannon_entropy(struct heuristic_ws *ws)  in shannon_entropy()  argument
1383 	sz_base = ilog2_w(ws->sample_size);  in shannon_entropy()
1384 	for (i = 0; i < BUCKET_SIZE && ws->bucket[i].count > 0; i++) {  in shannon_entropy()
1385 		p = ws->bucket[i].count;  in shannon_entropy()
1390 	entropy_sum /= ws->sample_size;  in shannon_entropy()
1512 static int byte_core_set_size(struct heuristic_ws *ws)  in byte_core_set_size()  argument
1516 	const u32 core_set_threshold = ws->sample_size * 90 / 100;  in byte_core_set_size()
1517 	struct bucket_item *bucket = ws->bucket;  in byte_core_set_size()
1520 	radix_sort(ws->bucket, ws->bucket_b, BUCKET_SIZE);  in byte_core_set_size()
1550 static u32 byte_set_size(const struct heuristic_ws *ws)  in byte_set_size()  argument
1556 		if (ws->bucket[i].count > 0)  in byte_set_size()
1566 		if (ws->bucket[i].count > 0) {  in byte_set_size()
1576 static bool sample_repeated_patterns(struct heuristic_ws *ws)  in sample_repeated_patterns()  argument
1578 	const u32 half_of_sample = ws->sample_size / 2;  in sample_repeated_patterns()
1579 	const u8 *data = ws->sample;  in sample_repeated_patterns()
1585 				     struct heuristic_ws *ws)  in heuristic_collect_sample()  argument
1621 			memcpy(&ws->sample[curr_sample_pos], &in_data[i],  in heuristic_collect_sample()
1633 	ws->sample_size = curr_sample_pos;  in heuristic_collect_sample()
1654 	struct heuristic_ws *ws;  in btrfs_compress_heuristic()  local
1659 	ws = list_entry(ws_list, struct heuristic_ws, list);  in btrfs_compress_heuristic()
1661 	heuristic_collect_sample(inode, start, end, ws);  in btrfs_compress_heuristic()
1663 	if (sample_repeated_patterns(ws)) {  in btrfs_compress_heuristic()
1668 	memset(ws->bucket, 0, sizeof(*ws->bucket)*BUCKET_SIZE);  in btrfs_compress_heuristic()
1670 	for (i = 0; i < ws->sample_size; i++) {  in btrfs_compress_heuristic()
1671 		byte = ws->sample[i];  in btrfs_compress_heuristic()
1672 		ws->bucket[byte].count++;  in btrfs_compress_heuristic()
1675 	i = byte_set_size(ws);  in btrfs_compress_heuristic()
1681 	i = byte_core_set_size(ws);  in btrfs_compress_heuristic()
1692 	i = shannon_entropy(ws);  in btrfs_compress_heuristic()