Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #ifndef __GLOCK_DOT_H__ | |
11 | #define __GLOCK_DOT_H__ | |
12 | ||
f2f7ba52 SW |
13 | #include "incore.h" |
14 | ||
b3b94faa DT |
15 | /* 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 | ||
b3b94faa DT |
23 | #define GL_ASYNC 0x00000040 |
24 | #define GL_EXACT 0x00000080 | |
25 | #define GL_SKIP 0x00000100 | |
26 | #define GL_ATIME 0x00000200 | |
27 | #define GL_NOCACHE 0x00000400 | |
b3b94faa | 28 | #define GL_NOCANCEL 0x00001000 |
b3b94faa DT |
29 | |
30 | #define GLR_TRYFAILED 13 | |
31 | #define GLR_CANCELED 14 | |
32 | ||
33 | static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) | |
34 | { | |
35 | struct gfs2_holder *gh; | |
36 | int locked = 0; | |
37 | ||
38 | /* Look in glock's list of holders for one with current task as owner */ | |
39 | spin_lock(&gl->gl_spin); | |
40 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
04b933f2 | 41 | if (gh->gh_owner_pid == current->pid) { |
b3b94faa DT |
42 | locked = 1; |
43 | break; | |
44 | } | |
45 | } | |
46 | spin_unlock(&gl->gl_spin); | |
47 | ||
48 | return locked; | |
49 | } | |
50 | ||
51 | static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) | |
52 | { | |
50299965 | 53 | return gl->gl_state == LM_ST_EXCLUSIVE; |
b3b94faa DT |
54 | } |
55 | ||
56 | static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) | |
57 | { | |
50299965 | 58 | return gl->gl_state == LM_ST_DEFERRED; |
b3b94faa DT |
59 | } |
60 | ||
61 | static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) | |
62 | { | |
50299965 | 63 | return gl->gl_state == LM_ST_SHARED; |
b3b94faa DT |
64 | } |
65 | ||
66 | static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) | |
67 | { | |
68 | int ret; | |
69 | spin_lock(&gl->gl_spin); | |
3b8249f6 | 70 | ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3); |
b3b94faa DT |
71 | spin_unlock(&gl->gl_spin); |
72 | return ret; | |
73 | } | |
74 | ||
b3b94faa | 75 | int gfs2_glock_get(struct gfs2_sbd *sdp, |
cd915493 | 76 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
77 | int create, struct gfs2_glock **glp); |
78 | void gfs2_glock_hold(struct gfs2_glock *gl); | |
79 | int gfs2_glock_put(struct gfs2_glock *gl); | |
190562bd | 80 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa | 81 | struct gfs2_holder *gh); |
190562bd SW |
82 | void gfs2_holder_reinit(unsigned int state, unsigned flags, |
83 | struct gfs2_holder *gh); | |
b3b94faa | 84 | void gfs2_holder_uninit(struct gfs2_holder *gh); |
b3b94faa DT |
85 | int gfs2_glock_nq(struct gfs2_holder *gh); |
86 | int gfs2_glock_poll(struct gfs2_holder *gh); | |
87 | int gfs2_glock_wait(struct gfs2_holder *gh); | |
88 | void gfs2_glock_dq(struct gfs2_holder *gh); | |
89 | ||
b3b94faa DT |
90 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
91 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, | |
cd915493 | 92 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
93 | unsigned int state, int flags, struct gfs2_holder *gh); |
94 | ||
95 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
96 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
97 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
98 | ||
d0dc80db SW |
99 | /** |
100 | * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock | |
101 | * @gl: the glock | |
102 | * @state: the state we're requesting | |
103 | * @flags: the modifier flags | |
104 | * @gh: the holder structure | |
105 | * | |
106 | * Returns: 0, GLR_*, or errno | |
107 | */ | |
108 | ||
109 | static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, | |
110 | unsigned int state, int flags, | |
111 | struct gfs2_holder *gh) | |
112 | { | |
113 | int error; | |
114 | ||
115 | gfs2_holder_init(gl, state, flags, gh); | |
116 | ||
117 | error = gfs2_glock_nq(gh); | |
118 | if (error) | |
119 | gfs2_holder_uninit(gh); | |
120 | ||
121 | return error; | |
122 | } | |
123 | ||
b3b94faa DT |
124 | /* Lock Value Block functions */ |
125 | ||
126 | int gfs2_lvb_hold(struct gfs2_glock *gl); | |
127 | void gfs2_lvb_unhold(struct gfs2_glock *gl); | |
b3b94faa | 128 | |
9b47c11d | 129 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); |
b3b94faa | 130 | |
b3b94faa DT |
131 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); |
132 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp); | |
133 | ||
134 | void gfs2_scand_internal(struct gfs2_sbd *sdp); | |
135 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); | |
136 | ||
85d1da67 | 137 | int __init gfs2_glock_init(void); |
7c52b166 RP |
138 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); |
139 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); | |
140 | int gfs2_register_debugfs(void); | |
141 | void gfs2_unregister_debugfs(void); | |
85d1da67 | 142 | |
b3b94faa | 143 | #endif /* __GLOCK_DOT_H__ */ |