X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6601e61aa18bf4f09af135ff61fc7f4771d23b06..f427ee49d309d8fc33ebf3042c3a775f2f530ded:/bsd/sys/lockf.h diff --git a/bsd/sys/lockf.h b/bsd/sys/lockf.h index 7c3e814d0..574ef7a70 100644 --- a/bsd/sys/lockf.h +++ b/bsd/sys/lockf.h @@ -1,23 +1,29 @@ /* - * 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 @@ -55,7 +61,7 @@ */ #ifndef _SYS_LOCKF_H_ -#define _SYS_LOCKF_H_ +#define _SYS_LOCKF_H_ #include #include @@ -67,46 +73,51 @@ struct vnode; 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