FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zfs_rlock.h

     /*
      * 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 https://opensource.org/licenses/CDDL-1.0.
     * 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 <sys/avl.h>
    
    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 */

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