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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12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
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.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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36 * @(#)lockf.h 8.1 (Berkeley) 6/11/93
43 #include <sys/queue.h>
45 struct vop_advlock_args;
48 MALLOC_DECLARE(M_LOCKF);
52 * The lockf structure is a kernel structure which contains the information
53 * associated with a byte range lock. The lockf structures are linked into
54 * the inode structure. Locks are sorted by the starting byte of the lock for
57 TAILQ_HEAD(locklist, lockf);
60 short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */
61 short lf_type; /* Lock type: F_RDLCK, F_WRLCK */
62 off_t lf_start; /* Byte # of the start of the lock */
63 off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */
64 caddr_t lf_id; /* Id of the resource holding the lock */
65 struct lockf **lf_head; /* Back pointer to the head of the locf list */
66 struct inode *lf_inode; /* Back pointer to the inode */
67 struct lockf *lf_next; /* Pointer to the next lock on this inode */
68 struct locklist lf_blkhd; /* List of requests blocked on this lock */
69 TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */
72 /* Maximum length of sleep chains to traverse to try and detect deadlock. */
75 int lf_advlock(struct vop_advlock_args *, struct lockf **, u_quad_t);
78 void lf_print(char *, struct lockf *);
79 void lf_printlist(char *, struct lockf *);
82 #endif /* !_SYS_LOCKF_H_ */