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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
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040013#include "incore.h"
14
David Teiglandb3b94fa2006-01-16 16:50:04 +000015/* Flags for lock requests; used in gfs2_holder gh_flag field.
16 From lm_interface.h:
17#define LM_FLAG_TRY 0x00000001
18#define LM_FLAG_TRY_1CB 0x00000002
19#define LM_FLAG_NOEXP 0x00000004
20#define LM_FLAG_ANY 0x00000008
21#define LM_FLAG_PRIORITY 0x00000010 */
22
David Teiglandb3b94fa2006-01-16 16:50:04 +000023#define GL_ASYNC 0x00000040
24#define GL_EXACT 0x00000080
25#define GL_SKIP 0x00000100
26#define GL_ATIME 0x00000200
27#define GL_NOCACHE 0x00000400
David Teiglandb3b94fa2006-01-16 16:50:04 +000028#define GL_NOCANCEL 0x00001000
David Teiglandb3b94fa2006-01-16 16:50:04 +000029
30#define GLR_TRYFAILED 13
31#define GLR_CANCELED 14
32
33static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
34{
35 struct gfs2_holder *gh;
36 int locked = 0;
37
38 /* Look in glock's list of holders for one with current task as owner */
39 spin_lock(&gl->gl_spin);
40 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
Robert Peterson04b933f2007-03-23 17:05:15 -050041 if (gh->gh_owner_pid == current->pid) {
David Teiglandb3b94fa2006-01-16 16:50:04 +000042 locked = 1;
43 break;
44 }
45 }
46 spin_unlock(&gl->gl_spin);
47
48 return locked;
49}
50
51static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
52{
Steven Whitehouse50299962006-09-04 09:49:55 -040053 return gl->gl_state == LM_ST_EXCLUSIVE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000054}
55
56static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
57{
Steven Whitehouse50299962006-09-04 09:49:55 -040058 return gl->gl_state == LM_ST_DEFERRED;
David Teiglandb3b94fa2006-01-16 16:50:04 +000059}
60
61static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
62{
Steven Whitehouse50299962006-09-04 09:49:55 -040063 return gl->gl_state == LM_ST_SHARED;
David Teiglandb3b94fa2006-01-16 16:50:04 +000064}
65
66static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
67{
68 int ret;
69 spin_lock(&gl->gl_spin);
Steven Whitehouse3b8249f2007-03-16 09:40:31 +000070 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3);
David Teiglandb3b94fa2006-01-16 16:50:04 +000071 spin_unlock(&gl->gl_spin);
72 return ret;
73}
74
David Teiglandb3b94fa2006-01-16 16:50:04 +000075int gfs2_glock_get(struct gfs2_sbd *sdp,
Steven Whitehousecd915492006-09-04 12:49:07 -040076 u64 number, const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +000077 int create, struct gfs2_glock **glp);
78void gfs2_glock_hold(struct gfs2_glock *gl);
79int gfs2_glock_put(struct gfs2_glock *gl);
Steven Whitehouse190562b2006-04-20 16:57:23 -040080void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
David Teiglandb3b94fa2006-01-16 16:50:04 +000081 struct gfs2_holder *gh);
Steven Whitehouse190562b2006-04-20 16:57:23 -040082void gfs2_holder_reinit(unsigned int state, unsigned flags,
83 struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000084void gfs2_holder_uninit(struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000085int gfs2_glock_nq(struct gfs2_holder *gh);
86int gfs2_glock_poll(struct gfs2_holder *gh);
87int gfs2_glock_wait(struct gfs2_holder *gh);
88void gfs2_glock_dq(struct gfs2_holder *gh);
89
David Teiglandb3b94fa2006-01-16 16:50:04 +000090void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
91int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
Steven Whitehousecd915492006-09-04 12:49:07 -040092 u64 number, const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +000093 unsigned int state, int flags, struct gfs2_holder *gh);
94
95int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
96void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
97void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
98
Steven Whitehoused0dc80d2006-03-29 14:36:49 -050099/**
100 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
101 * @gl: the glock
102 * @state: the state we're requesting
103 * @flags: the modifier flags
104 * @gh: the holder structure
105 *
106 * Returns: 0, GLR_*, or errno
107 */
108
109static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
110 unsigned int state, int flags,
111 struct gfs2_holder *gh)
112{
113 int error;
114
115 gfs2_holder_init(gl, state, flags, gh);
116
117 error = gfs2_glock_nq(gh);
118 if (error)
119 gfs2_holder_uninit(gh);
120
121 return error;
122}
123
David Teiglandb3b94fa2006-01-16 16:50:04 +0000124/* Lock Value Block functions */
125
126int gfs2_lvb_hold(struct gfs2_glock *gl);
127void gfs2_lvb_unhold(struct gfs2_glock *gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000128
Steven Whitehouse9b47c112006-09-08 10:17:58 -0400129void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000130
David Teiglandb3b94fa2006-01-16 16:50:04 +0000131void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
132void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
133
134void gfs2_scand_internal(struct gfs2_sbd *sdp);
135void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
136
Steven Whitehouse85d1da62006-09-07 14:40:21 -0400137int __init gfs2_glock_init(void);
Robert Peterson7c52b162007-03-16 10:26:37 +0000138int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
139void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
140int gfs2_register_debugfs(void);
141void gfs2_unregister_debugfs(void);
Steven Whitehouse85d1da62006-09-07 14:40:21 -0400142
David Teiglandb3b94fa2006-01-16 16:50:04 +0000143#endif /* __GLOCK_DOT_H__ */