2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Scooter Morris at Genentech Inc.
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9 * modification, are permitted provided that the following conditions
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13 * 2. Redistributions in binary form must reproduce the above copyright
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17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
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36 * @(#)lockf.h 8.1 (Berkeley) 6/11/93
37 * $FreeBSD: src/sys/sys/lockf.h,v 1.10 1999/08/28 00:51:51 peter Exp $
43 #include <sys/queue.h>
45 struct vop_advlock_args;
48 * The lockf structure is a kernel structure which contains the information
49 * associated with a byte range lock. The lockf structures are linked into
50 * the inode structure. Locks are sorted by the starting byte of the lock for
53 TAILQ_HEAD(locklist, lockf);
56 short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */
57 short lf_type; /* Lock type: F_RDLCK, F_WRLCK */
58 off_t lf_start; /* Byte # of the start of the lock */
59 off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */
60 caddr_t lf_id; /* Id of the resource holding the lock */
61 struct lockf **lf_head; /* Back pointer to the head of the locf list */
62 struct inode *lf_inode; /* Back pointer to the inode */
63 struct lockf *lf_next; /* Pointer to the next lock on this inode */
64 struct locklist lf_blkhd; /* List of requests blocked on this lock */
65 TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */
68 /* Maximum length of sleep chains to traverse to try and detect deadlock. */
71 int lf_advlock __P((struct vop_advlock_args *, struct lockf **, u_quad_t));
74 void lf_print __P((char *, struct lockf *));
75 void lf_printlist __P((char *, struct lockf *));
78 #endif /* !_SYS_LOCKF_H_ */