Home | History | Annotate | Download | only in sys
      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 2008 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 /*
     30  * Non-blocking mandatory locking support.
     31  */
     32 
     33 #ifdef __cplusplus
     34 extern "C" {
     35 #endif
     36 
     37 #include <sys/vnode.h>
     38 #include <sys/rwlock.h>
     39 #include <sys/cred.h>
     40 
     41 /*
     42  * Type of operation; used when checking for lock/share conflict.
     43  * NBL_READWRITE is used for checking for a conflict with an exclusive lock
     44  * (F_WRLCK) or a read-write mmap request.  For checking an actual I/O
     45  * request, use NBL_READ or NBL_WRITE.
     46  */
     47 typedef enum {NBL_READ, NBL_WRITE, NBL_RENAME, NBL_REMOVE,
     48 	    NBL_READWRITE} nbl_op_t;
     49 
     50 /* critical region primitives */
     51 extern void nbl_start_crit(vnode_t *, krw_t);
     52 extern void nbl_end_crit(vnode_t *);
     53 extern int nbl_in_crit(vnode_t *);
     54 
     55 /* conflict checking */
     56 extern int nbl_need_check(vnode_t *);
     57 extern int nbl_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int,
     58     caller_context_t *);
     59 extern int nbl_share_conflict(vnode_t *, nbl_op_t, caller_context_t *);
     60 extern int nbl_lock_conflict(vnode_t *, nbl_op_t, u_offset_t, ssize_t, int,
     61     caller_context_t *);
     62 extern int nbl_svmand(vnode_t *, cred_t *, int *);
     63 
     64 
     65 #ifdef __cplusplus
     66 }
     67 #endif
     68 
     69 #endif /* _NBMLOCK_H */
     70