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5981 Deadlock in dmu_objset_find_dp
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--- old/usr/src/uts/common/fs/zfs/sys/rrwlock.h
+++ new/usr/src/uts/common/fs/zfs/sys/rrwlock.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 23 * Use is subject to license terms.
24 24 */
25 25 /*
26 26 * Copyright (c) 2012 by Delphix. All rights reserved.
27 27 */
28 28
29 29 #ifndef _SYS_RR_RW_LOCK_H
30 30 #define _SYS_RR_RW_LOCK_H
31 31
32 32 #ifdef __cplusplus
33 33 extern "C" {
34 34 #endif
35 35
36 36 #include <sys/inttypes.h>
37 37 #include <sys/zfs_context.h>
38 38 #include <sys/refcount.h>
39 39
40 40 /*
41 41 * A reader-writer lock implementation that allows re-entrant reads, but
42 42 * still gives writers priority on "new" reads.
43 43 *
44 44 * See rrwlock.c for more details about the implementation.
45 45 *
46 46 * Fields of the rrwlock_t structure:
47 47 * - rr_lock: protects modification and reading of rrwlock_t fields
48 48 * - rr_cv: cv for waking up readers or waiting writers
49 49 * - rr_writer: thread id of the current writer
50 50 * - rr_anon_rount: number of active anonymous readers
51 51 * - rr_linked_rcount: total number of non-anonymous active readers
52 52 * - rr_writer_wanted: a writer wants the lock
53 53 */
54 54 typedef struct rrwlock {
55 55 kmutex_t rr_lock;
56 56 kcondvar_t rr_cv;
57 57 kthread_t *rr_writer;
58 58 refcount_t rr_anon_rcount;
59 59 refcount_t rr_linked_rcount;
60 60 boolean_t rr_writer_wanted;
61 61 boolean_t rr_track_all;
62 62 } rrwlock_t;
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63 63
64 64 /*
65 65 * 'tag' is used in reference counting tracking. The
66 66 * 'tag' must be the same in a rrw_enter() as in its
67 67 * corresponding rrw_exit().
68 68 */
69 69 void rrw_init(rrwlock_t *rrl, boolean_t track_all);
70 70 void rrw_destroy(rrwlock_t *rrl);
71 71 void rrw_enter(rrwlock_t *rrl, krw_t rw, void *tag);
72 72 void rrw_enter_read(rrwlock_t *rrl, void *tag);
73 +void rrw_enter_read_prio(rrwlock_t *rrl, void *tag);
73 74 void rrw_enter_write(rrwlock_t *rrl);
74 75 void rrw_exit(rrwlock_t *rrl, void *tag);
75 76 boolean_t rrw_held(rrwlock_t *rrl, krw_t rw);
76 77 void rrw_tsd_destroy(void *arg);
77 78
78 79 #define RRW_READ_HELD(x) rrw_held(x, RW_READER)
79 80 #define RRW_WRITE_HELD(x) rrw_held(x, RW_WRITER)
80 81 #define RRW_LOCK_HELD(x) \
81 82 (rrw_held(x, RW_WRITER) || rrw_held(x, RW_READER))
82 83
83 84 /*
84 85 * A reader-mostly lock implementation, tuning above reader-writer locks
85 86 * for hightly parallel read acquisitions, pessimizing write acquisitions.
86 87 *
87 88 * This should be a prime number. See comment in rrwlock.c near
88 89 * RRM_TD_LOCK() for details.
89 90 */
90 91 #define RRM_NUM_LOCKS 17
91 92 typedef struct rrmlock {
92 93 rrwlock_t locks[RRM_NUM_LOCKS];
93 94 } rrmlock_t;
94 95
95 96 void rrm_init(rrmlock_t *rrl, boolean_t track_all);
96 97 void rrm_destroy(rrmlock_t *rrl);
97 98 void rrm_enter(rrmlock_t *rrl, krw_t rw, void *tag);
98 99 void rrm_enter_read(rrmlock_t *rrl, void *tag);
99 100 void rrm_enter_write(rrmlock_t *rrl);
100 101 void rrm_exit(rrmlock_t *rrl, void *tag);
101 102 boolean_t rrm_held(rrmlock_t *rrl, krw_t rw);
102 103
103 104 #define RRM_READ_HELD(x) rrm_held(x, RW_READER)
104 105 #define RRM_WRITE_HELD(x) rrm_held(x, RW_WRITER)
105 106 #define RRM_LOCK_HELD(x) \
106 107 (rrm_held(x, RW_WRITER) || rrm_held(x, RW_READER))
107 108
108 109 #ifdef __cplusplus
109 110 }
110 111 #endif
111 112
112 113 #endif /* _SYS_RR_RW_LOCK_H */
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