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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
23#define GL_LOCAL_EXCL 0x00000020
24#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
Steven Whitehousefe1bded2006-04-18 10:09:15 -040030#define GL_AOP 0x00004000
Steven Whitehouse320dd102006-05-18 16:25:27 -040031#define GL_DUMP 0x00008000
David Teiglandb3b94fa2006-01-16 16:50:04 +000032
33#define GLR_TRYFAILED 13
34#define GLR_CANCELED 14
35
36static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
37{
38 struct gfs2_holder *gh;
39 int locked = 0;
40
41 /* Look in glock's list of holders for one with current task as owner */
42 spin_lock(&gl->gl_spin);
43 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
44 if (gh->gh_owner == current) {
45 locked = 1;
46 break;
47 }
48 }
49 spin_unlock(&gl->gl_spin);
50
51 return locked;
52}
53
54static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
55{
Steven Whitehouse50299962006-09-04 09:49:55 -040056 return gl->gl_state == LM_ST_EXCLUSIVE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000057}
58
59static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
60{
Steven Whitehouse50299962006-09-04 09:49:55 -040061 return gl->gl_state == LM_ST_DEFERRED;
David Teiglandb3b94fa2006-01-16 16:50:04 +000062}
63
64static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
65{
Steven Whitehouse50299962006-09-04 09:49:55 -040066 return gl->gl_state == LM_ST_SHARED;
David Teiglandb3b94fa2006-01-16 16:50:04 +000067}
68
69static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
70{
71 int ret;
72 spin_lock(&gl->gl_spin);
73 ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
74 spin_unlock(&gl->gl_spin);
75 return ret;
76}
77
David Teiglandb3b94fa2006-01-16 16:50:04 +000078int gfs2_glock_get(struct gfs2_sbd *sdp,
Steven Whitehousecd915492006-09-04 12:49:07 -040079 u64 number, const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +000080 int create, struct gfs2_glock **glp);
81void gfs2_glock_hold(struct gfs2_glock *gl);
82int gfs2_glock_put(struct gfs2_glock *gl);
Steven Whitehouse190562b2006-04-20 16:57:23 -040083void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
David Teiglandb3b94fa2006-01-16 16:50:04 +000084 struct gfs2_holder *gh);
Steven Whitehouse190562b2006-04-20 16:57:23 -040085void gfs2_holder_reinit(unsigned int state, unsigned flags,
86 struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000087void gfs2_holder_uninit(struct gfs2_holder *gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000088
89void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
90void gfs2_glock_drop_th(struct gfs2_glock *gl);
91
David Teiglandb3b94fa2006-01-16 16:50:04 +000092int gfs2_glock_nq(struct gfs2_holder *gh);
93int gfs2_glock_poll(struct gfs2_holder *gh);
94int gfs2_glock_wait(struct gfs2_holder *gh);
95void gfs2_glock_dq(struct gfs2_holder *gh);
96
David Teiglandb3b94fa2006-01-16 16:50:04 +000097int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
98
David Teiglandb3b94fa2006-01-16 16:50:04 +000099void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
100int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
Steven Whitehousecd915492006-09-04 12:49:07 -0400101 u64 number, const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000102 unsigned int state, int flags, struct gfs2_holder *gh);
103
104int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
105void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
106void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
107
Steven Whitehousecd915492006-09-04 12:49:07 -0400108void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number,
Steven Whitehouse8fb4b532006-08-30 09:30:00 -0400109 const struct gfs2_glock_operations *glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000110 unsigned int state, int flags);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400111void gfs2_glock_inode_squish(struct inode *inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000112
Steven Whitehoused0dc80d2006-03-29 14:36:49 -0500113/**
114 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
115 * @gl: the glock
116 * @state: the state we're requesting
117 * @flags: the modifier flags
118 * @gh: the holder structure
119 *
120 * Returns: 0, GLR_*, or errno
121 */
122
123static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
124 unsigned int state, int flags,
125 struct gfs2_holder *gh)
126{
127 int error;
128
129 gfs2_holder_init(gl, state, flags, gh);
130
131 error = gfs2_glock_nq(gh);
132 if (error)
133 gfs2_holder_uninit(gh);
134
135 return error;
136}
137
David Teiglandb3b94fa2006-01-16 16:50:04 +0000138/* Lock Value Block functions */
139
140int gfs2_lvb_hold(struct gfs2_glock *gl);
141void gfs2_lvb_unhold(struct gfs2_glock *gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000142
Steven Whitehouse9b47c112006-09-08 10:17:58 -0400143void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000144
David Teiglandb3b94fa2006-01-16 16:50:04 +0000145void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
146void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
147
148void gfs2_scand_internal(struct gfs2_sbd *sdp);
149void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
150
Steven Whitehouse85d1da62006-09-07 14:40:21 -0400151int __init gfs2_glock_init(void);
152
David Teiglandb3b94fa2006-01-16 16:50:04 +0000153#endif /* __GLOCK_DOT_H__ */