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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 2001 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #ifndef _NBMLOCK_H 28 #define _NBMLOCK_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Non-blocking mandatory locking support. 34 */ 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 #include <sys/vnode.h> 41 #include <sys/rwlock.h> 42 #include <sys/cred.h> 43 44 /* 45 * Type of operation; used when checking for lock/share conflict. 46 * NBL_READWRITE is used for checking for a conflict with an exclusive lock 47 * (F_WRLCK) or a read-write mmap request. For checking an actual I/O 48 * request, use NBL_READ or NBL_WRITE. 49 */ 50 typedef enum {NBL_READ, NBL_WRITE, NBL_RENAME, NBL_REMOVE, 51 NBL_READWRITE} nbl_op_t; 52 53 /* critical region primitives */ 54 extern void nbl_start_crit(vnode_t *, krw_t); 55 extern void nbl_end_crit(vnode_t *); 56 extern int nbl_in_crit(vnode_t *); 57 58 /* conflict checking */ 59 extern int nbl_need_check(vnode_t *); 60 extern int nbl_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int); 61 extern int nbl_share_conflict(vnode_t *, nbl_op_t); 62 extern int nbl_lock_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int); 63 extern int nbl_svmand(vnode_t *, cred_t *, int *); 64 65 extern nbl_op_t nbl_lock_to_op(int); 66 67 #ifdef __cplusplus 68 } 69 #endif 70 71 #endif /* _NBMLOCK_H */ 72