/*
- * 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,
* 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.
* 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.
* 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 <sys/queue.h>
+#include <sys/cdefs.h>
+
+struct vnop_advlock_args;
+struct vnode;
+
+#ifdef MALLOC_DECLARE
+MALLOC_DECLARE(M_LOCKF);
+#endif
-#include <sys/appleapiopts.h>
+#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_ */
projects / apple / xnu.git / blobdiff