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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 | ||
e8edc6e0 | 13 | #include <linux/sched.h> |
f2f7ba52 SW |
14 | #include "incore.h" |
15 | ||
b3b94faa DT |
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 | ||
b3b94faa DT |
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 | |
b3b94faa | 29 | #define GL_NOCANCEL 0x00001000 |
b3b94faa DT |
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) { | |
04b933f2 | 42 | if (gh->gh_owner_pid == current->pid) { |
b3b94faa DT |
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 | { | |
50299965 | 54 | return gl->gl_state == LM_ST_EXCLUSIVE; |
b3b94faa DT |
55 | } |
56 | ||
57 | static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) | |
58 | { | |
50299965 | 59 | return gl->gl_state == LM_ST_DEFERRED; |
b3b94faa DT |
60 | } |
61 | ||
62 | static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) | |
63 | { | |
50299965 | 64 | return gl->gl_state == LM_ST_SHARED; |
b3b94faa DT |
65 | } |
66 | ||
67 | static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) | |
68 | { | |
69 | int ret; | |
70 | spin_lock(&gl->gl_spin); | |
3b8249f6 | 71 | ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3); |
b3b94faa DT |
72 | spin_unlock(&gl->gl_spin); |
73 | return ret; | |
74 | } | |
75 | ||
b3b94faa | 76 | int gfs2_glock_get(struct gfs2_sbd *sdp, |
cd915493 | 77 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
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); | |
190562bd | 81 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa | 82 | struct gfs2_holder *gh); |
190562bd SW |
83 | void gfs2_holder_reinit(unsigned int state, unsigned flags, |
84 | struct gfs2_holder *gh); | |
b3b94faa | 85 | void gfs2_holder_uninit(struct gfs2_holder *gh); |
b3b94faa DT |
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 | ||
b3b94faa DT |
91 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
92 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, | |
cd915493 | 93 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
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 | ||
d0dc80db SW |
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 | ||
b3b94faa DT |
125 | /* Lock Value Block functions */ |
126 | ||
127 | int gfs2_lvb_hold(struct gfs2_glock *gl); | |
128 | void gfs2_lvb_unhold(struct gfs2_glock *gl); | |
b3b94faa | 129 | |
9b47c11d | 130 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); |
b3b94faa | 131 | |
b3b94faa DT |
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 | ||
85d1da67 | 138 | int __init gfs2_glock_init(void); |
7c52b166 RP |
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); | |
85d1da67 | 143 | |
b3b94faa | 144 | #endif /* __GLOCK_DOT_H__ */ |