/*
- * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2004-2018 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * 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. 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,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * 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_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1991, 1993
*/
#ifndef _SYS_LOCKF_H_
-#define _SYS_LOCKF_H_
+#define _SYS_LOCKF_H_
#include <sys/queue.h>
#include <sys/cdefs.h>
MALLOC_DECLARE(M_LOCKF);
#endif
+#if IMPORTANCE_INHERITANCE
+#define LF_NOT_BOOSTED 0
+#define LF_BOOSTED 1
+#endif /* IMPORTANCE_INHERITANCE */
+
/*
* 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);
-#if __DARWIN_ALIGN_POWER
-#pragma options align=power
-#endif
-
struct lockf {
- short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */
- short lf_type; /* Lock type: F_RDLCK, F_WRLCK */
- 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 */
+ 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 */
};
-#if __DARWIN_ALIGN_POWER
-#pragma options align=reset
-#endif
-
-/* Maximum length of sleep chains to traverse to try and detect deadlock. */
-#define MAXDEPTH 50
-
__BEGIN_DECLS
-int lf_advlock(struct vnop_advlock_args *);
+#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);
#ifdef LOCKF_DEBUG
-void lf_print(char *, struct lockf *);
-void lf_printlist(char *, struct lockf *);
+void lf_print(char *, struct lockf *);
+void lf_printlist(char *, struct lockf *);
#endif
+#endif /* KERNEL_PRIVATE */
__END_DECLS
projects / apple / xnu.git / blobdiff