1 /* $NetBSD: offtab.h,v 1.3 2017/04/16 23:50:40 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef VNDCOMPRESS_OFFTAB_H 33 #define VNDCOMPRESS_OFFTAB_H 34 35 #include <sys/cdefs.h> 36 37 #include <stdbool.h> 38 #include <stdint.h> 39 40 #include "common.h" 41 42 struct offtab { 43 uint32_t ot_n_offsets; 44 uint32_t ot_window_size; 45 uint32_t ot_window_start; 46 uint64_t *ot_window; 47 uint32_t ot_blkno; 48 int ot_fd; 49 off_t ot_fdpos; 50 void (*ot_report)(const char *, ...) __printflike(1,2); 51 void (*ot_reportx)(const char *, ...) __printflike(1,2); 52 enum offtab_mode { 53 OFFTAB_MODE_NONE, 54 OFFTAB_MODE_READ, 55 OFFTAB_MODE_WRITE, 56 } ot_mode; 57 }; 58 59 #define OFFTAB_MAX_FDPOS \ 60 ((off_t)(MIN(OFF_MAX, UINT64_MAX) - \ 61 (off_t)MAX_N_OFFSETS*sizeof(uint64_t))) 62 63 void offtab_init(struct offtab *, uint32_t, uint32_t, int, off_t); 64 void offtab_destroy(struct offtab *); 65 66 bool offtab_transmogrify_read_to_write(struct offtab *, uint32_t); 67 68 bool offtab_reset_read(struct offtab *, 69 void (*)(const char *, ...) __printflike(1,2), 70 void (*)(const char *, ...) __printflike(1,2)); 71 bool offtab_prepare_get(struct offtab *, uint32_t); 72 uint64_t offtab_get(struct offtab *, uint32_t); 73 74 void offtab_reset_write(struct offtab *); 75 void offtab_checkpoint(struct offtab *, uint32_t, int); 76 #define OFFTAB_CHECKPOINT_SYNC 1 77 void offtab_prepare_put(struct offtab *, uint32_t); 78 void offtab_put(struct offtab *, uint32_t, uint64_t); 79 80 #endif /* VNDCOMPRESS_OFFTAB_H */ 81