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gerrit-public.fairphone.software / kernel / msm-4.9 / d0dc80dbafb5c10ad2084831a61bbf945484a139 / . / fs / gfs2 / glock.h
blob: 560029de8d0782ee1a27f4d25c27d7070972bbd7 [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
30
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) {
42 if (gh->gh_owner == current) {
43 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{
54 return (gl->gl_state == LM_ST_EXCLUSIVE);
55}
56
57static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
58{
59 return (gl->gl_state == LM_ST_DEFERRED);
60}
61
62static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
63{
64 return (gl->gl_state == LM_ST_SHARED);
65}
66
67static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
68{
69 int ret;
70 spin_lock(&gl->gl_spin);
71 ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
72 spin_unlock(&gl->gl_spin);
73 return ret;
74}
75
76struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
77 struct lm_lockname *name);
78int gfs2_glock_get(struct gfs2_sbd *sdp,
79 uint64_t number, struct gfs2_glock_operations *glops,
80 int create, struct gfs2_glock **glp);
81void gfs2_glock_hold(struct gfs2_glock *gl);
82int gfs2_glock_put(struct gfs2_glock *gl);
83
84void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, int flags,
85 struct gfs2_holder *gh);
86void gfs2_holder_reinit(unsigned int state, int flags, struct gfs2_holder *gh);
87void gfs2_holder_uninit(struct gfs2_holder *gh);
88struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state,
89 int flags, gfp_t gfp_flags);
90void gfs2_holder_put(struct gfs2_holder *gh);
91
92void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
93void gfs2_glock_drop_th(struct gfs2_glock *gl);
94
95void gfs2_glmutex_lock(struct gfs2_glock *gl);
96int gfs2_glmutex_trylock(struct gfs2_glock *gl);
97void gfs2_glmutex_unlock(struct gfs2_glock *gl);
98
99int gfs2_glock_nq(struct gfs2_holder *gh);
100int gfs2_glock_poll(struct gfs2_holder *gh);
101int gfs2_glock_wait(struct gfs2_holder *gh);
102void gfs2_glock_dq(struct gfs2_holder *gh);
103
104void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, int flags);
105void gfs2_glock_force_drop(struct gfs2_glock *gl);
106
107int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
108
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]109void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
110int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
111 uint64_t number, struct gfs2_glock_operations *glops,
112 unsigned int state, int flags, struct gfs2_holder *gh);
113
114int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
115void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
116void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
117
118void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number,
119 struct gfs2_glock_operations *glops,
120 unsigned int state, int flags);
121
Steven Whitehoused0dc80d2006-03-29 14:36:49 -0500[diff] [blame^]122/**
123 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
124 * @gl: the glock
125 * @state: the state we're requesting
126 * @flags: the modifier flags
127 * @gh: the holder structure
128 *
129 * Returns: 0, GLR_*, or errno
130 */
131
132static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
133 unsigned int state, int flags,
134 struct gfs2_holder *gh)
135{
136 int error;
137
138 gfs2_holder_init(gl, state, flags, gh);
139
140 error = gfs2_glock_nq(gh);
141 if (error)
142 gfs2_holder_uninit(gh);
143
144 return error;
145}
146
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]147/* Lock Value Block functions */
148
149int gfs2_lvb_hold(struct gfs2_glock *gl);
150void gfs2_lvb_unhold(struct gfs2_glock *gl);
151void gfs2_lvb_sync(struct gfs2_glock *gl);
152
153void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data);
154
155void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum);
156void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
157
158void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
159void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
160
161void gfs2_scand_internal(struct gfs2_sbd *sdp);
162void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
163
164int gfs2_dump_lockstate(struct gfs2_sbd *sdp);
165
166#endif /* __GLOCK_DOT_H__ */