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 | ||
23 | #define GL_LOCAL_EXCL 0x00000020 | |
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 |
fe1bdedc | 30 | #define GL_AOP 0x00004000 |
320dd101 | 31 | #define GL_DUMP 0x00008000 |
b3b94faa DT |
32 | |
33 | #define GLR_TRYFAILED 13 | |
34 | #define GLR_CANCELED 14 | |
35 | ||
36 | static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) | |
37 | { | |
38 | struct gfs2_holder *gh; | |
39 | int locked = 0; | |
40 | ||
41 | /* Look in glock's list of holders for one with current task as owner */ | |
42 | spin_lock(&gl->gl_spin); | |
43 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
44 | if (gh->gh_owner == current) { | |
45 | locked = 1; | |
46 | break; | |
47 | } | |
48 | } | |
49 | spin_unlock(&gl->gl_spin); | |
50 | ||
51 | return locked; | |
52 | } | |
53 | ||
54 | static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) | |
55 | { | |
50299965 | 56 | return gl->gl_state == LM_ST_EXCLUSIVE; |
b3b94faa DT |
57 | } |
58 | ||
59 | static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) | |
60 | { | |
50299965 | 61 | return gl->gl_state == LM_ST_DEFERRED; |
b3b94faa DT |
62 | } |
63 | ||
64 | static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) | |
65 | { | |
50299965 | 66 | return gl->gl_state == LM_ST_SHARED; |
b3b94faa DT |
67 | } |
68 | ||
69 | static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) | |
70 | { | |
71 | int ret; | |
72 | spin_lock(&gl->gl_spin); | |
73 | ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3); | |
74 | spin_unlock(&gl->gl_spin); | |
75 | return ret; | |
76 | } | |
77 | ||
b3b94faa | 78 | int gfs2_glock_get(struct gfs2_sbd *sdp, |
cd915493 | 79 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
80 | int create, struct gfs2_glock **glp); |
81 | void gfs2_glock_hold(struct gfs2_glock *gl); | |
82 | int gfs2_glock_put(struct gfs2_glock *gl); | |
190562bd | 83 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa | 84 | struct gfs2_holder *gh); |
190562bd SW |
85 | void gfs2_holder_reinit(unsigned int state, unsigned flags, |
86 | struct gfs2_holder *gh); | |
b3b94faa | 87 | void gfs2_holder_uninit(struct gfs2_holder *gh); |
b3b94faa DT |
88 | |
89 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags); | |
90 | void gfs2_glock_drop_th(struct gfs2_glock *gl); | |
91 | ||
b3b94faa DT |
92 | int gfs2_glock_nq(struct gfs2_holder *gh); |
93 | int gfs2_glock_poll(struct gfs2_holder *gh); | |
94 | int gfs2_glock_wait(struct gfs2_holder *gh); | |
95 | void gfs2_glock_dq(struct gfs2_holder *gh); | |
96 | ||
b3b94faa DT |
97 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time); |
98 | ||
b3b94faa DT |
99 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
100 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, | |
cd915493 | 101 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
102 | unsigned int state, int flags, struct gfs2_holder *gh); |
103 | ||
104 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
105 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
106 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
107 | ||
cd915493 | 108 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 109 | const struct gfs2_glock_operations *glops, |
b3b94faa | 110 | unsigned int state, int flags); |
feaa7bba | 111 | void gfs2_glock_inode_squish(struct inode *inode); |
b3b94faa | 112 | |
d0dc80db SW |
113 | /** |
114 | * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock | |
115 | * @gl: the glock | |
116 | * @state: the state we're requesting | |
117 | * @flags: the modifier flags | |
118 | * @gh: the holder structure | |
119 | * | |
120 | * Returns: 0, GLR_*, or errno | |
121 | */ | |
122 | ||
123 | static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, | |
124 | unsigned int state, int flags, | |
125 | struct gfs2_holder *gh) | |
126 | { | |
127 | int error; | |
128 | ||
129 | gfs2_holder_init(gl, state, flags, gh); | |
130 | ||
131 | error = gfs2_glock_nq(gh); | |
132 | if (error) | |
133 | gfs2_holder_uninit(gh); | |
134 | ||
135 | return error; | |
136 | } | |
137 | ||
b3b94faa DT |
138 | /* Lock Value Block functions */ |
139 | ||
140 | int gfs2_lvb_hold(struct gfs2_glock *gl); | |
141 | void gfs2_lvb_unhold(struct gfs2_glock *gl); | |
b3b94faa | 142 | |
9b47c11d | 143 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); |
b3b94faa | 144 | |
b3b94faa DT |
145 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); |
146 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp); | |
147 | ||
148 | void gfs2_scand_internal(struct gfs2_sbd *sdp); | |
149 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); | |
150 | ||
85d1da67 SW |
151 | int __init gfs2_glock_init(void); |
152 | ||
b3b94faa | 153 | #endif /* __GLOCK_DOT_H__ */ |