1eda14cbcSMatt Macy /* 2eda14cbcSMatt Macy * CDDL HEADER START 3eda14cbcSMatt Macy * 4eda14cbcSMatt Macy * The contents of this file are subject to the terms of the 5eda14cbcSMatt Macy * Common Development and Distribution License (the "License"). 6eda14cbcSMatt Macy * You may not use this file except in compliance with the License. 7eda14cbcSMatt Macy * 8eda14cbcSMatt Macy * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*271171e0SMartin Matuska * or https://opensource.org/licenses/CDDL-1.0. 10eda14cbcSMatt Macy * See the License for the specific language governing permissions 11eda14cbcSMatt Macy * and limitations under the License. 12eda14cbcSMatt Macy * 13eda14cbcSMatt Macy * When distributing Covered Code, include this CDDL HEADER in each 14eda14cbcSMatt Macy * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15eda14cbcSMatt Macy * If applicable, add the following below this CDDL HEADER, with the 16eda14cbcSMatt Macy * fields enclosed by brackets "[]" replaced with your own identifying 17eda14cbcSMatt Macy * information: Portions Copyright [yyyy] [name of copyright owner] 18eda14cbcSMatt Macy * 19eda14cbcSMatt Macy * CDDL HEADER END 20eda14cbcSMatt Macy */ 21eda14cbcSMatt Macy /* 22eda14cbcSMatt Macy * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23eda14cbcSMatt Macy * Use is subject to license terms. 24eda14cbcSMatt Macy */ 25eda14cbcSMatt Macy /* 26eda14cbcSMatt Macy * Copyright (c) 2018 by Delphix. All rights reserved. 27eda14cbcSMatt Macy */ 28eda14cbcSMatt Macy 29eda14cbcSMatt Macy #ifndef _SYS_FS_ZFS_RLOCK_H 30eda14cbcSMatt Macy #define _SYS_FS_ZFS_RLOCK_H 31eda14cbcSMatt Macy 32eda14cbcSMatt Macy #ifdef __cplusplus 33eda14cbcSMatt Macy extern "C" { 34eda14cbcSMatt Macy #endif 35eda14cbcSMatt Macy 36eda14cbcSMatt Macy #include <sys/avl.h> 37eda14cbcSMatt Macy 38eda14cbcSMatt Macy typedef enum { 39eda14cbcSMatt Macy RL_READER, 40eda14cbcSMatt Macy RL_WRITER, 41eda14cbcSMatt Macy RL_APPEND 42eda14cbcSMatt Macy } zfs_rangelock_type_t; 43eda14cbcSMatt Macy 44eda14cbcSMatt Macy struct zfs_locked_range; 45eda14cbcSMatt Macy 46eda14cbcSMatt Macy typedef void (zfs_rangelock_cb_t)(struct zfs_locked_range *, void *); 47eda14cbcSMatt Macy 48eda14cbcSMatt Macy typedef struct zfs_rangelock { 49eda14cbcSMatt Macy avl_tree_t rl_tree; /* contains locked_range_t */ 50eda14cbcSMatt Macy kmutex_t rl_lock; 51eda14cbcSMatt Macy zfs_rangelock_cb_t *rl_cb; 52eda14cbcSMatt Macy void *rl_arg; 53eda14cbcSMatt Macy } zfs_rangelock_t; 54eda14cbcSMatt Macy 55eda14cbcSMatt Macy typedef struct zfs_locked_range { 56eda14cbcSMatt Macy zfs_rangelock_t *lr_rangelock; /* rangelock that this lock applies to */ 57eda14cbcSMatt Macy avl_node_t lr_node; /* avl node link */ 58eda14cbcSMatt Macy uint64_t lr_offset; /* file range offset */ 59eda14cbcSMatt Macy uint64_t lr_length; /* file range length */ 60eda14cbcSMatt Macy uint_t lr_count; /* range reference count in tree */ 61eda14cbcSMatt Macy zfs_rangelock_type_t lr_type; /* range type */ 62eda14cbcSMatt Macy kcondvar_t lr_write_cv; /* cv for waiting writers */ 63eda14cbcSMatt Macy kcondvar_t lr_read_cv; /* cv for waiting readers */ 64eda14cbcSMatt Macy uint8_t lr_proxy; /* acting for original range */ 65eda14cbcSMatt Macy uint8_t lr_write_wanted; /* writer wants to lock this range */ 66eda14cbcSMatt Macy uint8_t lr_read_wanted; /* reader wants to lock this range */ 67eda14cbcSMatt Macy } zfs_locked_range_t; 68eda14cbcSMatt Macy 69eda14cbcSMatt Macy void zfs_rangelock_init(zfs_rangelock_t *, zfs_rangelock_cb_t *, void *); 70eda14cbcSMatt Macy void zfs_rangelock_fini(zfs_rangelock_t *); 71eda14cbcSMatt Macy 72eda14cbcSMatt Macy zfs_locked_range_t *zfs_rangelock_enter(zfs_rangelock_t *, 73eda14cbcSMatt Macy uint64_t, uint64_t, zfs_rangelock_type_t); 74eda14cbcSMatt Macy zfs_locked_range_t *zfs_rangelock_tryenter(zfs_rangelock_t *, 75eda14cbcSMatt Macy uint64_t, uint64_t, zfs_rangelock_type_t); 76eda14cbcSMatt Macy void zfs_rangelock_exit(zfs_locked_range_t *); 77eda14cbcSMatt Macy void zfs_rangelock_reduce(zfs_locked_range_t *, uint64_t, uint64_t); 78eda14cbcSMatt Macy 79eda14cbcSMatt Macy #ifdef __cplusplus 80eda14cbcSMatt Macy } 81eda14cbcSMatt Macy #endif 82eda14cbcSMatt Macy 83eda14cbcSMatt Macy #endif /* _SYS_FS_ZFS_RLOCK_H */ 84