1*9719b6dcSriastradh /* $NetBSD: offtab.h,v 1.3 2017/04/16 23:50:40 riastradh Exp $ */ 2735c2397Sriastradh 3735c2397Sriastradh /*- 4735c2397Sriastradh * Copyright (c) 2014 The NetBSD Foundation, Inc. 5735c2397Sriastradh * All rights reserved. 6735c2397Sriastradh * 7735c2397Sriastradh * This code is derived from software contributed to The NetBSD Foundation 8735c2397Sriastradh * by Taylor R. Campbell. 9735c2397Sriastradh * 10735c2397Sriastradh * Redistribution and use in source and binary forms, with or without 11735c2397Sriastradh * modification, are permitted provided that the following conditions 12735c2397Sriastradh * are met: 13735c2397Sriastradh * 1. Redistributions of source code must retain the above copyright 14735c2397Sriastradh * notice, this list of conditions and the following disclaimer. 15735c2397Sriastradh * 2. Redistributions in binary form must reproduce the above copyright 16735c2397Sriastradh * notice, this list of conditions and the following disclaimer in the 17735c2397Sriastradh * documentation and/or other materials provided with the distribution. 18735c2397Sriastradh * 19735c2397Sriastradh * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20735c2397Sriastradh * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21735c2397Sriastradh * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22735c2397Sriastradh * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23735c2397Sriastradh * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24735c2397Sriastradh * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25735c2397Sriastradh * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26735c2397Sriastradh * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27735c2397Sriastradh * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28735c2397Sriastradh * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29735c2397Sriastradh * POSSIBILITY OF SUCH DAMAGE. 30735c2397Sriastradh */ 31735c2397Sriastradh 32735c2397Sriastradh #ifndef VNDCOMPRESS_OFFTAB_H 33735c2397Sriastradh #define VNDCOMPRESS_OFFTAB_H 34735c2397Sriastradh 35735c2397Sriastradh #include <sys/cdefs.h> 36735c2397Sriastradh 37735c2397Sriastradh #include <stdbool.h> 38735c2397Sriastradh #include <stdint.h> 39735c2397Sriastradh 40*9719b6dcSriastradh #include "common.h" 41*9719b6dcSriastradh 42735c2397Sriastradh struct offtab { 43735c2397Sriastradh uint32_t ot_n_offsets; 443e40e9d7Sriastradh uint32_t ot_window_size; 453e40e9d7Sriastradh uint32_t ot_window_start; 463e40e9d7Sriastradh uint64_t *ot_window; 47735c2397Sriastradh uint32_t ot_blkno; 48735c2397Sriastradh int ot_fd; 49735c2397Sriastradh off_t ot_fdpos; 50735c2397Sriastradh void (*ot_report)(const char *, ...) __printflike(1,2); 51735c2397Sriastradh void (*ot_reportx)(const char *, ...) __printflike(1,2); 52735c2397Sriastradh enum offtab_mode { 53735c2397Sriastradh OFFTAB_MODE_NONE, 54735c2397Sriastradh OFFTAB_MODE_READ, 55735c2397Sriastradh OFFTAB_MODE_WRITE, 56735c2397Sriastradh } ot_mode; 57735c2397Sriastradh }; 58735c2397Sriastradh 59*9719b6dcSriastradh #define OFFTAB_MAX_FDPOS \ 60*9719b6dcSriastradh ((off_t)(MIN(OFF_MAX, UINT64_MAX) - \ 61*9719b6dcSriastradh (off_t)MAX_N_OFFSETS*sizeof(uint64_t))) 62*9719b6dcSriastradh 633e40e9d7Sriastradh void offtab_init(struct offtab *, uint32_t, uint32_t, int, off_t); 64735c2397Sriastradh void offtab_destroy(struct offtab *); 65735c2397Sriastradh 663e40e9d7Sriastradh bool offtab_transmogrify_read_to_write(struct offtab *, uint32_t); 67735c2397Sriastradh 68735c2397Sriastradh bool offtab_reset_read(struct offtab *, 69735c2397Sriastradh void (*)(const char *, ...) __printflike(1,2), 70735c2397Sriastradh void (*)(const char *, ...) __printflike(1,2)); 71735c2397Sriastradh bool offtab_prepare_get(struct offtab *, uint32_t); 72735c2397Sriastradh uint64_t offtab_get(struct offtab *, uint32_t); 73735c2397Sriastradh 74735c2397Sriastradh void offtab_reset_write(struct offtab *); 75735c2397Sriastradh void offtab_checkpoint(struct offtab *, uint32_t, int); 76735c2397Sriastradh #define OFFTAB_CHECKPOINT_SYNC 1 77735c2397Sriastradh void offtab_prepare_put(struct offtab *, uint32_t); 78735c2397Sriastradh void offtab_put(struct offtab *, uint32_t, uint64_t); 79735c2397Sriastradh 80735c2397Sriastradh #endif /* VNDCOMPRESS_OFFTAB_H */ 81