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gerrit-public.fairphone.software / kernel / msm / fe1bdedc6c16adedc6fd3636185ea91596b1d6eb / . / fs / gfs2 / glock.h
blob: b6646e7fed153bfc1cc684ea90eea3fa8d73dba5 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
8 */
9
10#ifndef __GLOCK_DOT_H__
11#define __GLOCK_DOT_H__
12
13/* Flags for lock requests; used in gfs2_holder gh_flag field.
14 From lm_interface.h:
15#define LM_FLAG_TRY 0x00000001
16#define LM_FLAG_TRY_1CB 0x00000002
17#define LM_FLAG_NOEXP 0x00000004
18#define LM_FLAG_ANY 0x00000008
19#define LM_FLAG_PRIORITY 0x00000010 */
20
21#define GL_LOCAL_EXCL 0x00000020
22#define GL_ASYNC 0x00000040
23#define GL_EXACT 0x00000080
24#define GL_SKIP 0x00000100
25#define GL_ATIME 0x00000200
26#define GL_NOCACHE 0x00000400
27#define GL_SYNC 0x00000800
28#define GL_NOCANCEL 0x00001000
29#define GL_NEVER_RECURSE 0x00002000
Steven Whitehousefe1bded2006-04-18 10:09:15 -0400[diff] [blame^]30#define GL_AOP 0x00004000
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]31
32#define GLR_TRYFAILED 13
33#define GLR_CANCELED 14
34
35static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
36{
37 struct gfs2_holder *gh;
38 int locked = 0;
39
40 /* Look in glock's list of holders for one with current task as owner */
41 spin_lock(&gl->gl_spin);
42 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
43 if (gh->gh_owner == current) {
44 locked = 1;
45 break;
46 }
47 }
48 spin_unlock(&gl->gl_spin);
49
50 return locked;
51}
52
53static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
54{
55 return (gl->gl_state == LM_ST_EXCLUSIVE);
56}
57
58static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
59{
60 return (gl->gl_state == LM_ST_DEFERRED);
61}
62
63static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
64{
65 return (gl->gl_state == LM_ST_SHARED);
66}
67
68static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
69{
70 int ret;
71 spin_lock(&gl->gl_spin);
72 ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
73 spin_unlock(&gl->gl_spin);
74 return ret;
75}
76
77struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
78 struct lm_lockname *name);
79int gfs2_glock_get(struct gfs2_sbd *sdp,
80 uint64_t number, struct gfs2_glock_operations *glops,
81 int create, struct gfs2_glock **glp);
82void gfs2_glock_hold(struct gfs2_glock *gl);
83int gfs2_glock_put(struct gfs2_glock *gl);
84
85void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, int flags,
86 struct gfs2_holder *gh);
87void gfs2_holder_reinit(unsigned int state, int flags, struct gfs2_holder *gh);
88void gfs2_holder_uninit(struct gfs2_holder *gh);
89struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state,
90 int flags, gfp_t gfp_flags);
91void gfs2_holder_put(struct gfs2_holder *gh);
92
93void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
94void gfs2_glock_drop_th(struct gfs2_glock *gl);
95
96void gfs2_glmutex_lock(struct gfs2_glock *gl);
97int gfs2_glmutex_trylock(struct gfs2_glock *gl);
98void gfs2_glmutex_unlock(struct gfs2_glock *gl);
99
100int gfs2_glock_nq(struct gfs2_holder *gh);
101int gfs2_glock_poll(struct gfs2_holder *gh);
102int gfs2_glock_wait(struct gfs2_holder *gh);
103void gfs2_glock_dq(struct gfs2_holder *gh);
104
105void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, int flags);
106void gfs2_glock_force_drop(struct gfs2_glock *gl);
107
108int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
109
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]110void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
111int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
112 uint64_t number, struct gfs2_glock_operations *glops,
113 unsigned int state, int flags, struct gfs2_holder *gh);
114
115int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
116void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
117void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
118
119void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number,
120 struct gfs2_glock_operations *glops,
121 unsigned int state, int flags);
122
Steven Whitehoused0dc80d2006-03-29 14:36:49 -0500[diff] [blame]123/**
124 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
125 * @gl: the glock
126 * @state: the state we're requesting
127 * @flags: the modifier flags
128 * @gh: the holder structure
129 *
130 * Returns: 0, GLR_*, or errno
131 */
132
133static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
134 unsigned int state, int flags,
135 struct gfs2_holder *gh)
136{
137 int error;
138
139 gfs2_holder_init(gl, state, flags, gh);
140
141 error = gfs2_glock_nq(gh);
142 if (error)
143 gfs2_holder_uninit(gh);
144
145 return error;
146}
147
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]148/* Lock Value Block functions */
149
150int gfs2_lvb_hold(struct gfs2_glock *gl);
151void gfs2_lvb_unhold(struct gfs2_glock *gl);
152void gfs2_lvb_sync(struct gfs2_glock *gl);
153
154void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data);
155
156void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum);
157void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
158
159void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
160void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
161
162void gfs2_scand_internal(struct gfs2_sbd *sdp);
163void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
164
165int gfs2_dump_lockstate(struct gfs2_sbd *sdp);
166
167#endif /* __GLOCK_DOT_H__ */