Detach sched.h from mm.h
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / glock.h
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 2.
8 */
9
10 #ifndef __GLOCK_DOT_H__
11 #define __GLOCK_DOT_H__
12
13 #include <linux/sched.h>
14 #include "incore.h"
15
16 /* Flags for lock requests; used in gfs2_holder gh_flag field.
17 From lm_interface.h:
18 #define LM_FLAG_TRY 0x00000001
19 #define LM_FLAG_TRY_1CB 0x00000002
20 #define LM_FLAG_NOEXP 0x00000004
21 #define LM_FLAG_ANY 0x00000008
22 #define LM_FLAG_PRIORITY 0x00000010 */
23
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
29 #define GL_NOCANCEL 0x00001000
30
31 #define GLR_TRYFAILED 13
32 #define GLR_CANCELED 14
33
34 static 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_pid == current->pid) {
43 locked = 1;
44 break;
45 }
46 }
47 spin_unlock(&gl->gl_spin);
48
49 return locked;
50 }
51
52 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
53 {
54 return gl->gl_state == LM_ST_EXCLUSIVE;
55 }
56
57 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
58 {
59 return gl->gl_state == LM_ST_DEFERRED;
60 }
61
62 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
63 {
64 return gl->gl_state == LM_ST_SHARED;
65 }
66
67 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
68 {
69 int ret;
70 spin_lock(&gl->gl_spin);
71 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3);
72 spin_unlock(&gl->gl_spin);
73 return ret;
74 }
75
76 int gfs2_glock_get(struct gfs2_sbd *sdp,
77 u64 number, const struct gfs2_glock_operations *glops,
78 int create, struct gfs2_glock **glp);
79 void gfs2_glock_hold(struct gfs2_glock *gl);
80 int gfs2_glock_put(struct gfs2_glock *gl);
81 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
82 struct gfs2_holder *gh);
83 void gfs2_holder_reinit(unsigned int state, unsigned flags,
84 struct gfs2_holder *gh);
85 void gfs2_holder_uninit(struct gfs2_holder *gh);
86 int gfs2_glock_nq(struct gfs2_holder *gh);
87 int gfs2_glock_poll(struct gfs2_holder *gh);
88 int gfs2_glock_wait(struct gfs2_holder *gh);
89 void gfs2_glock_dq(struct gfs2_holder *gh);
90
91 void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
92 int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
93 u64 number, const struct gfs2_glock_operations *glops,
94 unsigned int state, int flags, struct gfs2_holder *gh);
95
96 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
97 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
98 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
99
100 /**
101 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
102 * @gl: the glock
103 * @state: the state we're requesting
104 * @flags: the modifier flags
105 * @gh: the holder structure
106 *
107 * Returns: 0, GLR_*, or errno
108 */
109
110 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
111 unsigned int state, int flags,
112 struct gfs2_holder *gh)
113 {
114 int error;
115
116 gfs2_holder_init(gl, state, flags, gh);
117
118 error = gfs2_glock_nq(gh);
119 if (error)
120 gfs2_holder_uninit(gh);
121
122 return error;
123 }
124
125 /* Lock Value Block functions */
126
127 int gfs2_lvb_hold(struct gfs2_glock *gl);
128 void gfs2_lvb_unhold(struct gfs2_glock *gl);
129
130 void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
131
132 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
133 void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
134
135 void gfs2_scand_internal(struct gfs2_sbd *sdp);
136 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
137
138 int __init gfs2_glock_init(void);
139 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
140 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
141 int gfs2_register_debugfs(void);
142 void gfs2_unregister_debugfs(void);
143
144 #endif /* __GLOCK_DOT_H__ */