1 /* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Scooter Morris at Genentech Inc. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)lockf.h 8.1 (Berkeley) 06/11/93 11 */ 12 13 /* 14 * The lockf structure is a kernel structure which contains the information 15 * associated with a byte range lock. The lockf structures are linked into 16 * the inode structure. Locks are sorted by the starting byte of the lock for 17 * efficiency. 18 */ 19 struct lockf { 20 short lf_flags; /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */ 21 short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ 22 off_t lf_start; /* The byte # of the start of the lock */ 23 off_t lf_end; /* The byte # of the end of the lock (-1=EOF)*/ 24 caddr_t lf_id; /* The id of the resource holding the lock */ 25 struct inode *lf_inode; /* Back pointer to the inode */ 26 struct lockf *lf_next; /* A pointer to the next lock on this inode */ 27 struct lockf *lf_block; /* The list of blocked locks */ 28 }; 29 30 /* Maximum length of sleep chains to traverse to try and detect deadlock. */ 31 #define MAXDEPTH 50 32 33 __BEGIN_DECLS 34 void lf_addblock __P((struct lockf *, struct lockf *)); 35 int lf_clearlock __P((struct lockf *)); 36 int lf_findoverlap __P((struct lockf *, 37 struct lockf *, int, struct lockf ***, struct lockf **)); 38 struct lockf * 39 lf_getblock __P((struct lockf *)); 40 int lf_getlock __P((struct lockf *, struct flock *)); 41 int lf_setlock __P((struct lockf *)); 42 void lf_split __P((struct lockf *, struct lockf *)); 43 void lf_wakelock __P((struct lockf *)); 44 __END_DECLS 45 46 #ifdef LOCKF_DEBUG 47 extern int lockf_debug; 48 49 __BEGIN_DECLS 50 void lf_print __P((char *, struct lockf *)); 51 void lf_printlist __P((char *, struct lockf *)); 52 __END_DECLS 53 #endif 54