X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/43866e378188c25dd1e2208016ab3cbeb086ae6c..f427ee49d309d8fc33ebf3042c3a775f2f530ded:/bsd/sys/lockf.h?ds=sidebyside diff --git a/bsd/sys/lockf.h b/bsd/sys/lockf.h index 226b91aba..574ef7a70 100644 --- a/bsd/sys/lockf.h +++ b/bsd/sys/lockf.h @@ -1,17 +1,20 @@ /* - * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2004-2018 Apple Inc. All rights reserved. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. - * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. - * + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -19,10 +22,9 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * - * @APPLE_LICENSE_HEADER_END@ + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ -/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. @@ -38,10 +40,6 @@ * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. @@ -59,58 +57,68 @@ * SUCH DAMAGE. * * @(#)lockf.h 8.1 (Berkeley) 6/11/93 + * $FreeBSD: src/sys/sys/lockf.h,v 1.16 2004/04/07 04:19:49 imp Exp $ */ #ifndef _SYS_LOCKF_H_ -#define _SYS_LOCKF_H_ +#define _SYS_LOCKF_H_ + +#include +#include + +struct vnop_advlock_args; +struct vnode; + +#ifdef MALLOC_DECLARE +MALLOC_DECLARE(M_LOCKF); +#endif -#include +#if IMPORTANCE_INHERITANCE +#define LF_NOT_BOOSTED 0 +#define LF_BOOSTED 1 +#endif /* IMPORTANCE_INHERITANCE */ -#ifdef __APPLE_API_PRIVATE /* * The lockf structure is a kernel structure which contains the information * associated with a byte range lock. The lockf structures are linked into - * the inode structure. Locks are sorted by the starting byte of the lock for - * efficiency. + * the vnode structure. Locks are sorted by the starting byte of the lock for + * efficiency after they have been committed; uncommitted locks are on the list + * head so they may quickly be accessed, and are both short lived and transient. */ +TAILQ_HEAD(locklist, lockf); + struct lockf { - short lf_flags; /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */ - short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ - off_t lf_start; /* The byte # of the start of the lock */ - off_t lf_end; /* The byte # of the end of the lock (-1=EOF)*/ - caddr_t lf_id; /* The id of the resource holding the lock */ - struct lockf **lf_head; /* Back pointer to the head of lockf list */ - struct lockf *lf_next; /* A pointer to the next lock on this inode */ - struct lockf *lf_block; /* The list of blocked locks */ + short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */ + short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ +#if IMPORTANCE_INHERITANCE + int lf_boosted; /* Is the owner of the lock boosted */ +#endif + off_t lf_start; /* Byte # of the start of the lock */ + off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */ + caddr_t lf_id; /* Id of the resource holding the lock */ + struct lockf **lf_head; /* Back pointer to the head of the locf list */ + struct vnode *lf_vnode; /* Back pointer to the inode */ + struct lockf *lf_next; /* Pointer to the next lock on this inode */ + struct locklist lf_blkhd; /* List of requests blocked on this lock */ + TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */ + struct proc *lf_owner; /* The proc that did the SETLK, if known */ }; -/* Maximum length of sleep chains to traverse to try and detect deadlock. */ -#define MAXDEPTH 50 - __BEGIN_DECLS -void lf_addblock __P((struct lockf *, struct lockf *)); -int lf_advlock __P((struct lockf **, - off_t, caddr_t, int, struct flock *, int)); -int lf_clearlock __P((struct lockf *)); -int lf_findoverlap __P((struct lockf *, - struct lockf *, int, struct lockf ***, struct lockf **)); -struct lockf * - lf_getblock __P((struct lockf *)); -int lf_getlock __P((struct lockf *, struct flock *)); -int lf_setlock __P((struct lockf *)); -void lf_split __P((struct lockf *, struct lockf *)); -void lf_wakelock __P((struct lockf *)); -__END_DECLS -#if LOCKF_DEBUG -extern int lockf_debug; +#ifdef KERNEL_PRIVATE +void lf_init(void); +int lf_advlock(struct vnop_advlock_args *); +int lf_assert(struct vnop_advlock_args *, void **); +void lf_commit(void *, int); +void lf_abort_advlocks(vnode_t); -__BEGIN_DECLS -void lf_print __P((char *, struct lockf *)); -void lf_printlist __P((char *, struct lockf *)); -__END_DECLS -#endif /* LOCKF_DEBUG */ +#ifdef LOCKF_DEBUG +void lf_print(char *, struct lockf *); +void lf_printlist(char *, struct lockf *); +#endif +#endif /* KERNEL_PRIVATE */ -#endif /* __APPLE_API_PRIVATE */ +__END_DECLS #endif /* !_SYS_LOCKF_H_ */