1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25/* 26 * Copyright (c) 2018 by Delphix. All rights reserved. 27 */ 28 29#ifndef _SYS_FS_ZFS_RLOCK_H 30#define _SYS_FS_ZFS_RLOCK_H 31 32#ifdef __cplusplus 33extern "C" { 34#endif 35 36#ifdef __FreeBSD__ 37#define rangelock_init zfs_rangelock_init 38#define rangelock_fini zfs_rangelock_fini 39#endif 40 41typedef enum { 42 RL_READER, 43 RL_WRITER, 44 RL_APPEND 45} rangelock_type_t; 46 47struct locked_range; 48 49typedef void (rangelock_cb_t)(struct locked_range *, void *); 50 51#ifdef __FreeBSD__ 52typedef struct zfs_rangelock { 53#else 54typedef struct rangelock { 55#endif 56 avl_tree_t rl_tree; /* contains locked_range_t */ 57 kmutex_t rl_lock; 58 rangelock_cb_t *rl_cb; 59 void *rl_arg; 60} rangelock_t; 61 62typedef struct locked_range { 63 rangelock_t *lr_rangelock; /* rangelock that this lock applies to */ 64 avl_node_t lr_node; /* avl node link */ 65 uint64_t lr_offset; /* file range offset */ 66 uint64_t lr_length; /* file range length */ 67 uint_t lr_count; /* range reference count in tree */ 68 rangelock_type_t lr_type; /* range type */ 69 kcondvar_t lr_write_cv; /* cv for waiting writers */ 70 kcondvar_t lr_read_cv; /* cv for waiting readers */ 71 uint8_t lr_proxy; /* acting for original range */ 72 uint8_t lr_write_wanted; /* writer wants to lock this range */ 73 uint8_t lr_read_wanted; /* reader wants to lock this range */ 74} locked_range_t; 75 76void rangelock_init(rangelock_t *, rangelock_cb_t *, void *); 77void rangelock_fini(rangelock_t *); 78 79locked_range_t *rangelock_enter(rangelock_t *, 80 uint64_t, uint64_t, rangelock_type_t); 81void rangelock_exit(locked_range_t *); 82void rangelock_reduce(locked_range_t *, uint64_t, uint64_t); 83 84#ifdef __cplusplus 85} 86#endif 87 88#endif /* _SYS_FS_ZFS_RLOCK_H */ 89