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David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#ifndef __GLOCK_DOT_H__
11#define __GLOCK_DOT_H__
12
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040013#include <linux/sched.h>
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040014#include "incore.h"
15
David Teiglandb3b94fa2006-01-16 16:50:04 +000016/* Flags for lock requests; used in gfs2_holder gh_flag field.
17 From lm_interface.h:
18#define LM_FLAG_TRY 0x00000001
19#define LM_FLAG_TRY_1CB 0x00000002
20#define LM_FLAG_NOEXP 0x00000004
21#define LM_FLAG_ANY 0x00000008
22#define LM_FLAG_PRIORITY 0x00000010 */
23
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#define GL_ASYNC 0x00000040
25#define GL_EXACT 0x00000080
26#define GL_SKIP 0x00000100
27#define GL_ATIME 0x00000200
28#define GL_NOCACHE 0x00000400
David Teiglandb3b94fa2006-01-16 16:50:04 +000029#define GL_NOCANCEL 0x00001000
David Teiglandb3b94fa2006-01-16 16:50:04 +000030
31#define GLR_TRYFAILED 13
32#define GLR_CANCELED 14
33
34static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
35{
36 struct gfs2_holder *gh;
37 int locked = 0;
38
39 /* Look in glock's list of holders for one with current task as owner */
40 spin_lock(&gl->gl_spin);
41 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
Robert Peterson04b933f2007-03-23 17:05:15 -050042 if (gh->gh_owner_pid == current->pid) {
David Teiglandb3b94fa2006-01-16 16:50:04 +000043 locked = 1;
44 break;
45 }
46 }
47 spin_unlock(&gl->gl_spin);
48
49 return locked;
50}
51
52static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
53{
Steven Whitehouse50299962006-09-04 09:49:55 -040054 return gl->gl_state == LM_ST_EXCLUSIVE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000055}
56
57static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
58{
Steven Whitehouse50299962006-09-04 09:49:55 -040059 return gl->gl_state == LM_ST_DEFERRED;
David Teiglandb3b94fa2006-01-16 16:50:04 +000060}
61
62static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
63{
Steven Whitehouse50299962006-09-04 09:49:55 -040064 return gl->gl_state == LM_ST_SHARED;
David Teiglandb3b94fa2006-01-16 16:50:04 +000065}
66
67static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
68{
69 int ret;
70 spin_lock(&gl->gl_spin);
Steven Whitehouse3b8249f2007-03-16 09:40:31 +000071 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3);
David Teiglandb3b94fa2006-01-16 16:50:04 +000072 spin_unlock(&gl->gl_spin);
73 return ret;
74}
75
David Teiglandb3b94fa2006-01-16 16:50:04 +000076int gfs2_glock_get(struct gfs2_sbd *sdp,
Steven Whitehousecd915492006-09-04 12:49:07 -040077 u64 number, const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +000078 int create, struct gfs2_glock **glp);
79void gfs2_glock_hold(struct gfs2_glock *gl);
80int gfs2_glock_put(struct gfs2_glock *gl);
Steven Whitehouse190562b2006-04-20 16:57:23 -040081void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
David Teiglandb3b94fa2006-01-16 16:50:04 +000082 struct gfs2_holder *gh);
Steven Whitehouse190562b2006-04-20 16:57:23 -040083void gfs2_holder_reinit(unsigned int state, unsigned flags,
84 struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000085void gfs2_holder_uninit(struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000086int gfs2_glock_nq(struct gfs2_holder *gh);
87int gfs2_glock_poll(struct gfs2_holder *gh);
88int gfs2_glock_wait(struct gfs2_holder *gh);
89void gfs2_glock_dq(struct gfs2_holder *gh);
Abhijith Dasd93cfa92007-06-11 08:22:32 +010090void gfs2_glock_dq_wait(struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000091
David Teiglandb3b94fa2006-01-16 16:50:04 +000092void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
93int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
Steven Whitehousecd915492006-09-04 12:49:07 -040094 u64 number, const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +000095 unsigned int state, int flags, struct gfs2_holder *gh);
96
97int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
98void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
99void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
100
Steven Whitehoused0dc80d2006-03-29 14:36:49 -0500101/**
102 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
103 * @gl: the glock
104 * @state: the state we're requesting
105 * @flags: the modifier flags
106 * @gh: the holder structure
107 *
108 * Returns: 0, GLR_*, or errno
109 */
110
111static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
112 unsigned int state, int flags,
113 struct gfs2_holder *gh)
114{
115 int error;
116
117 gfs2_holder_init(gl, state, flags, gh);
118
119 error = gfs2_glock_nq(gh);
120 if (error)
121 gfs2_holder_uninit(gh);
122
123 return error;
124}
125
David Teiglandb3b94fa2006-01-16 16:50:04 +0000126/* Lock Value Block functions */
127
128int gfs2_lvb_hold(struct gfs2_glock *gl);
129void gfs2_lvb_unhold(struct gfs2_glock *gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000130
Steven Whitehouse9b47c112006-09-08 10:17:58 -0400131void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000132
David Teiglandb3b94fa2006-01-16 16:50:04 +0000133void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
134void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
135
136void gfs2_scand_internal(struct gfs2_sbd *sdp);
137void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
138
Steven Whitehouse85d1da62006-09-07 14:40:21 -0400139int __init gfs2_glock_init(void);
Robert Peterson7c52b162007-03-16 10:26:37 +0000140int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
141void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
142int gfs2_register_debugfs(void);
143void gfs2_unregister_debugfs(void);
Steven Whitehouse85d1da62006-09-07 14:40:21 -0400144
David Teiglandb3b94fa2006-01-16 16:50:04 +0000145#endif /* __GLOCK_DOT_H__ */