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1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 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 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 | |
29 | #define GL_NEVER_RECURSE 0x00002000 | |
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 == current) { | |
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 = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3); | |
72 | spin_unlock(&gl->gl_spin); | |
73 | return ret; | |
74 | } | |
75 | ||
76 | struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp, | |
77 | struct lm_lockname *name); | |
78 | int gfs2_glock_get(struct gfs2_sbd *sdp, | |
79 | uint64_t number, struct gfs2_glock_operations *glops, | |
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); | |
83 | ||
84 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, int flags, | |
85 | struct gfs2_holder *gh); | |
86 | void gfs2_holder_reinit(unsigned int state, int flags, struct gfs2_holder *gh); | |
87 | void gfs2_holder_uninit(struct gfs2_holder *gh); | |
88 | struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state, | |
89 | int flags, gfp_t gfp_flags); | |
90 | void gfs2_holder_put(struct gfs2_holder *gh); | |
91 | ||
92 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags); | |
93 | void gfs2_glock_drop_th(struct gfs2_glock *gl); | |
94 | ||
95 | void gfs2_glmutex_lock(struct gfs2_glock *gl); | |
96 | int gfs2_glmutex_trylock(struct gfs2_glock *gl); | |
97 | void gfs2_glmutex_unlock(struct gfs2_glock *gl); | |
98 | ||
99 | int gfs2_glock_nq(struct gfs2_holder *gh); | |
100 | int gfs2_glock_poll(struct gfs2_holder *gh); | |
101 | int gfs2_glock_wait(struct gfs2_holder *gh); | |
102 | void gfs2_glock_dq(struct gfs2_holder *gh); | |
103 | ||
104 | void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, int flags); | |
105 | void gfs2_glock_force_drop(struct gfs2_glock *gl); | |
106 | ||
107 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time); | |
108 | ||
109 | int gfs2_glock_nq_init(struct gfs2_glock *gl, unsigned int state, int flags, | |
110 | struct gfs2_holder *gh); | |
111 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); | |
112 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, | |
113 | uint64_t number, struct gfs2_glock_operations *glops, | |
114 | unsigned int state, int flags, struct gfs2_holder *gh); | |
115 | ||
116 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
117 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
118 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
119 | ||
120 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number, | |
121 | struct gfs2_glock_operations *glops, | |
122 | unsigned int state, int flags); | |
123 | ||
124 | /* Lock Value Block functions */ | |
125 | ||
126 | int gfs2_lvb_hold(struct gfs2_glock *gl); | |
127 | void gfs2_lvb_unhold(struct gfs2_glock *gl); | |
128 | void gfs2_lvb_sync(struct gfs2_glock *gl); | |
129 | ||
130 | void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data); | |
131 | ||
132 | void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum); | |
133 | void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state); | |
134 | ||
135 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); | |
136 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp); | |
137 | ||
138 | void gfs2_scand_internal(struct gfs2_sbd *sdp); | |
139 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); | |
140 | ||
141 | int gfs2_dump_lockstate(struct gfs2_sbd *sdp); | |
142 | ||
143 | #endif /* __GLOCK_DOT_H__ */ |