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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _NBMLOCK_H 27 #define _NBMLOCK_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 /* 32 * Non-blocking mandatory locking support. 33 */ 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 #include <sys/vnode.h> 40 #include <sys/rwlock.h> 41 #include <sys/cred.h> 42 43 /* 44 * Type of operation; used when checking for lock/share conflict. 45 * NBL_READWRITE is used for checking for a conflict with an exclusive lock 46 * (F_WRLCK) or a read-write mmap request. For checking an actual I/O 47 * request, use NBL_READ or NBL_WRITE. 48 */ 49 typedef enum {NBL_READ, NBL_WRITE, NBL_RENAME, NBL_REMOVE, 50 NBL_READWRITE} nbl_op_t; 51 52 /* critical region primitives */ 53 extern void nbl_start_crit(vnode_t *, krw_t); 54 extern void nbl_end_crit(vnode_t *); 55 extern int nbl_in_crit(vnode_t *); 56 57 /* conflict checking */ 58 extern int nbl_need_check(vnode_t *); 59 extern int nbl_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int, 60 caller_context_t *); 61 extern int nbl_share_conflict(vnode_t *, nbl_op_t, caller_context_t *); 62 extern int nbl_lock_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int, 63 caller_context_t *); 64 extern int nbl_svmand(vnode_t *, cred_t *, int *); 65 66 extern nbl_op_t nbl_lock_to_op(int); 67 68 #ifdef __cplusplus 69 } 70 #endif 71 72 #endif /* _NBMLOCK_H */ 73