146203Smckusick /* 2*63376Sbostic * Copyright (c) 1991, 1993 3*63376Sbostic * The Regents of the University of California. All rights reserved. 446203Smckusick * 546203Smckusick * This code is derived from software contributed to Berkeley by 646203Smckusick * Scooter Morris at Genentech Inc. 746203Smckusick * 846203Smckusick * %sccs.include.redist.c% 946203Smckusick * 10*63376Sbostic * @(#)lockf.h 8.1 (Berkeley) 06/11/93 1146203Smckusick */ 1246203Smckusick 1346203Smckusick /* 1451506Sbostic * The lockf structure is a kernel structure which contains the information 1551506Sbostic * associated with a byte range lock. The lockf structures are linked into 1651506Sbostic * the inode structure. Locks are sorted by the starting byte of the lock for 1751506Sbostic * efficiency. 1846203Smckusick */ 1946203Smckusick struct lockf { 2046203Smckusick short lf_flags; /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */ 2146203Smckusick short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ 2246203Smckusick off_t lf_start; /* The byte # of the start of the lock */ 2346203Smckusick off_t lf_end; /* The byte # of the end of the lock (-1=EOF)*/ 2446203Smckusick caddr_t lf_id; /* The id of the resource holding the lock */ 2546203Smckusick struct inode *lf_inode; /* Back pointer to the inode */ 2646203Smckusick struct lockf *lf_next; /* A pointer to the next lock on this inode */ 2746203Smckusick struct lockf *lf_block; /* The list of blocked locks */ 2846203Smckusick }; 2946203Smckusick 3051506Sbostic /* Maximum length of sleep chains to traverse to try and detect deadlock. */ 3146203Smckusick #define MAXDEPTH 50 3246203Smckusick 3351506Sbostic __BEGIN_DECLS 3451506Sbostic void lf_addblock __P((struct lockf *, struct lockf *)); 3551506Sbostic int lf_clearlock __P((struct lockf *)); 3651506Sbostic int lf_findoverlap __P((struct lockf *, 3751506Sbostic struct lockf *, int, struct lockf ***, struct lockf **)); 3851506Sbostic struct lockf * 3951506Sbostic lf_getblock __P((struct lockf *)); 4051506Sbostic int lf_getlock __P((struct lockf *, struct flock *)); 4151506Sbostic int lf_setlock __P((struct lockf *)); 4251506Sbostic void lf_split __P((struct lockf *, struct lockf *)); 4351506Sbostic void lf_wakelock __P((struct lockf *)); 4451506Sbostic __END_DECLS 4546203Smckusick 4651506Sbostic #ifdef LOCKF_DEBUG 4746203Smckusick extern int lockf_debug; 4851506Sbostic 4951506Sbostic __BEGIN_DECLS 5051506Sbostic void lf_print __P((char *, struct lockf *)); 5151506Sbostic void lf_printlist __P((char *, struct lockf *)); 5251506Sbostic __END_DECLS 5351506Sbostic #endif 54