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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 | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #ifndef __GLOCK_DOT_H__ | |
11 | #define __GLOCK_DOT_H__ | |
12 | ||
13 | /* Flags for lock requests; used in gfs2_holder gh_flag field. | |
14 | From lm_interface.h: | |
15 | #define LM_FLAG_TRY 0x00000001 | |
16 | #define LM_FLAG_TRY_1CB 0x00000002 | |
17 | #define LM_FLAG_NOEXP 0x00000004 | |
18 | #define LM_FLAG_ANY 0x00000008 | |
19 | #define LM_FLAG_PRIORITY 0x00000010 */ | |
20 | ||
21 | #define GL_LOCAL_EXCL 0x00000020 | |
22 | #define GL_ASYNC 0x00000040 | |
23 | #define GL_EXACT 0x00000080 | |
24 | #define GL_SKIP 0x00000100 | |
25 | #define GL_ATIME 0x00000200 | |
26 | #define GL_NOCACHE 0x00000400 | |
27 | #define GL_SYNC 0x00000800 | |
28 | #define GL_NOCANCEL 0x00001000 | |
fe1bdedc | 29 | #define GL_AOP 0x00004000 |
320dd101 | 30 | #define GL_DUMP 0x00008000 |
b3b94faa DT |
31 | |
32 | #define GLR_TRYFAILED 13 | |
33 | #define GLR_CANCELED 14 | |
34 | ||
35 | static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) | |
36 | { | |
37 | struct gfs2_holder *gh; | |
38 | int locked = 0; | |
39 | ||
40 | /* Look in glock's list of holders for one with current task as owner */ | |
41 | spin_lock(&gl->gl_spin); | |
42 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
43 | if (gh->gh_owner == current) { | |
44 | locked = 1; | |
45 | break; | |
46 | } | |
47 | } | |
48 | spin_unlock(&gl->gl_spin); | |
49 | ||
50 | return locked; | |
51 | } | |
52 | ||
53 | static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) | |
54 | { | |
55 | return (gl->gl_state == LM_ST_EXCLUSIVE); | |
56 | } | |
57 | ||
58 | static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) | |
59 | { | |
60 | return (gl->gl_state == LM_ST_DEFERRED); | |
61 | } | |
62 | ||
63 | static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) | |
64 | { | |
65 | return (gl->gl_state == LM_ST_SHARED); | |
66 | } | |
67 | ||
68 | static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) | |
69 | { | |
70 | int ret; | |
71 | spin_lock(&gl->gl_spin); | |
72 | ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3); | |
73 | spin_unlock(&gl->gl_spin); | |
74 | return ret; | |
75 | } | |
76 | ||
b3b94faa DT |
77 | int gfs2_glock_get(struct gfs2_sbd *sdp, |
78 | uint64_t number, struct gfs2_glock_operations *glops, | |
79 | int create, struct gfs2_glock **glp); | |
80 | void gfs2_glock_hold(struct gfs2_glock *gl); | |
81 | int gfs2_glock_put(struct gfs2_glock *gl); | |
190562bd | 82 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa | 83 | struct gfs2_holder *gh); |
190562bd SW |
84 | void gfs2_holder_reinit(unsigned int state, unsigned flags, |
85 | struct gfs2_holder *gh); | |
b3b94faa | 86 | void gfs2_holder_uninit(struct gfs2_holder *gh); |
b3b94faa DT |
87 | |
88 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags); | |
89 | void gfs2_glock_drop_th(struct gfs2_glock *gl); | |
90 | ||
b3b94faa DT |
91 | int gfs2_glock_nq(struct gfs2_holder *gh); |
92 | int gfs2_glock_poll(struct gfs2_holder *gh); | |
93 | int gfs2_glock_wait(struct gfs2_holder *gh); | |
94 | void gfs2_glock_dq(struct gfs2_holder *gh); | |
95 | ||
b3b94faa DT |
96 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time); |
97 | ||
b3b94faa DT |
98 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
99 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, | |
100 | uint64_t number, struct gfs2_glock_operations *glops, | |
101 | unsigned int state, int flags, struct gfs2_holder *gh); | |
102 | ||
103 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
104 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
105 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
106 | ||
107 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number, | |
108 | struct gfs2_glock_operations *glops, | |
109 | unsigned int state, int flags); | |
feaa7bba | 110 | void gfs2_glock_inode_squish(struct inode *inode); |
b3b94faa | 111 | |
d0dc80db SW |
112 | /** |
113 | * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock | |
114 | * @gl: the glock | |
115 | * @state: the state we're requesting | |
116 | * @flags: the modifier flags | |
117 | * @gh: the holder structure | |
118 | * | |
119 | * Returns: 0, GLR_*, or errno | |
120 | */ | |
121 | ||
122 | static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, | |
123 | unsigned int state, int flags, | |
124 | struct gfs2_holder *gh) | |
125 | { | |
126 | int error; | |
127 | ||
128 | gfs2_holder_init(gl, state, flags, gh); | |
129 | ||
130 | error = gfs2_glock_nq(gh); | |
131 | if (error) | |
132 | gfs2_holder_uninit(gh); | |
133 | ||
134 | return error; | |
135 | } | |
136 | ||
b3b94faa DT |
137 | /* Lock Value Block functions */ |
138 | ||
139 | int gfs2_lvb_hold(struct gfs2_glock *gl); | |
140 | void gfs2_lvb_unhold(struct gfs2_glock *gl); | |
b3b94faa DT |
141 | |
142 | void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data); | |
143 | ||
b3b94faa DT |
144 | void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state); |
145 | ||
146 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); | |
147 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp); | |
148 | ||
149 | void gfs2_scand_internal(struct gfs2_sbd *sdp); | |
150 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); | |
151 | ||
b3b94faa | 152 | #endif /* __GLOCK_DOT_H__ */ |