aboutsummaryrefslogtreecommitdiff
path: root/fs/gfs2/glock.h
blob: 06847ebebdee5ffe869fdf28a397feed35f39f59 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 */

#ifndef __GLOCK_DOT_H__
#define __GLOCK_DOT_H__

/* Flags for lock requests; used in gfs2_holder gh_flag field.
   From lm_interface.h:
#define LM_FLAG_TRY		0x00000001
#define LM_FLAG_TRY_1CB		0x00000002
#define LM_FLAG_NOEXP		0x00000004
#define LM_FLAG_ANY		0x00000008
#define LM_FLAG_PRIORITY	0x00000010 */

#define GL_LOCAL_EXCL		0x00000020
#define GL_ASYNC		0x00000040
#define GL_EXACT		0x00000080
#define GL_SKIP			0x00000100
#define GL_ATIME		0x00000200
#define GL_NOCACHE		0x00000400
#define GL_SYNC			0x00000800
#define GL_NOCANCEL		0x00001000
#define GL_NEVER_RECURSE	0x00002000

#define GLR_TRYFAILED		13
#define GLR_CANCELED		14

static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
{
	struct gfs2_holder *gh;
	int locked = 0;

	/* Look in glock's list of holders for one with current task as owner */
	spin_lock(&gl->gl_spin);
	list_for_each_entry(gh, &gl->gl_holders, gh_list) {
		if (gh->gh_owner == current) {
			locked = 1;
			break;
		}
	}
	spin_unlock(&gl->gl_spin);

	return locked;
}

static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
{
	return (gl->gl_state == LM_ST_EXCLUSIVE);
}

static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
{
	return (gl->gl_state == LM_ST_DEFERRED);
}

static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
{
	return (gl->gl_state == LM_ST_SHARED);
}

static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
{
	int ret;
	spin_lock(&gl->gl_spin);
	ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
	spin_unlock(&gl->gl_spin);
	return ret;
}

struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
				   struct lm_lockname *name);
int gfs2_glock_get(struct gfs2_sbd *sdp,
		   uint64_t number, struct gfs2_glock_operations *glops,
		   int create, struct gfs2_glock **glp);
void gfs2_glock_hold(struct gfs2_glock *gl);
int gfs2_glock_put(struct gfs2_glock *gl);

void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, int flags,
		      struct gfs2_holder *gh);
void gfs2_holder_reinit(unsigned int state, int flags, struct gfs2_holder *gh);
void gfs2_holder_uninit(struct gfs2_holder *gh);
struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state,
				    int flags, gfp_t gfp_flags);
void gfs2_holder_put(struct gfs2_holder *gh);

void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
void gfs2_glock_drop_th(struct gfs2_glock *gl);

void gfs2_glmutex_lock(struct gfs2_glock *gl);
int gfs2_glmutex_trylock(struct gfs2_glock *gl);
void gfs2_glmutex_unlock(struct gfs2_glock *gl);

int gfs2_glock_nq(struct gfs2_holder *gh);
int gfs2_glock_poll(struct gfs2_holder *gh);
int gfs2_glock_wait(struct gfs2_holder *gh);
void gfs2_glock_dq(struct gfs2_holder *gh);

void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, int flags);
void gfs2_glock_force_drop(struct gfs2_glock *gl);

int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);

int gfs2_glock_nq_init(struct gfs2_glock *gl, unsigned int state, int flags,
		       struct gfs2_holder *gh);
void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
		      uint64_t number, struct gfs2_glock_operations *glops,
		      unsigned int state, int flags, struct gfs2_holder *gh);

int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);

void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number,
			     struct gfs2_glock_operations *glops,
			     unsigned int state, int flags);

/*  Lock Value Block functions  */

int gfs2_lvb_hold(struct gfs2_glock *gl);
void gfs2_lvb_unhold(struct gfs2_glock *gl);
void gfs2_lvb_sync(struct gfs2_glock *gl);

void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data);

void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum);
void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);

void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
void gfs2_reclaim_glock(struct gfs2_sbd *sdp);

void gfs2_scand_internal(struct gfs2_sbd *sdp);
void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);

int gfs2_dump_lockstate(struct gfs2_sbd *sdp);

#endif /* __GLOCK_DOT_H__ */