/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright (c) 2018 by Delphix. All rights reserved. */ #ifndef _SYS_FS_ZFS_RLOCK_H #define _SYS_FS_ZFS_RLOCK_H #ifdef __cplusplus extern "C" { #endif #include typedef enum { RL_READER, RL_WRITER, RL_APPEND } zfs_rangelock_type_t; struct zfs_locked_range; typedef void (zfs_rangelock_cb_t)(struct zfs_locked_range *, void *); typedef struct zfs_rangelock { avl_tree_t rl_tree; /* contains locked_range_t */ kmutex_t rl_lock; zfs_rangelock_cb_t *rl_cb; void *rl_arg; } zfs_rangelock_t; typedef struct zfs_locked_range { zfs_rangelock_t *lr_rangelock; /* rangelock that this lock applies to */ avl_node_t lr_node; /* avl node link */ uint64_t lr_offset; /* file range offset */ uint64_t lr_length; /* file range length */ uint_t lr_count; /* range reference count in tree */ zfs_rangelock_type_t lr_type; /* range type */ kcondvar_t lr_write_cv; /* cv for waiting writers */ kcondvar_t lr_read_cv; /* cv for waiting readers */ uint8_t lr_proxy; /* acting for original range */ uint8_t lr_write_wanted; /* writer wants to lock this range */ uint8_t lr_read_wanted; /* reader wants to lock this range */ } zfs_locked_range_t; void zfs_rangelock_init(zfs_rangelock_t *, zfs_rangelock_cb_t *, void *); void zfs_rangelock_fini(zfs_rangelock_t *); zfs_locked_range_t *zfs_rangelock_enter(zfs_rangelock_t *, uint64_t, uint64_t, zfs_rangelock_type_t); zfs_locked_range_t *zfs_rangelock_tryenter(zfs_rangelock_t *, uint64_t, uint64_t, zfs_rangelock_type_t); void zfs_rangelock_exit(zfs_locked_range_t *); void zfs_rangelock_reduce(zfs_locked_range_t *, uint64_t, uint64_t); #ifdef __cplusplus } #endif #endif /* _SYS_FS_ZFS_RLOCK_H */