2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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.
10 #ifndef __GLOCK_DOT_H__
11 #define __GLOCK_DOT_H__
13 /* Flags for lock requests; used in gfs2_holder gh_flag field.
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 */
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 #define GL_AOP 0x00004000
32 #define GLR_TRYFAILED 13
33 #define GLR_CANCELED 14
35 static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
37 struct gfs2_holder *gh;
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) {
48 spin_unlock(&gl->gl_spin);
53 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
55 return (gl->gl_state == LM_ST_EXCLUSIVE);
58 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
60 return (gl->gl_state == LM_ST_DEFERRED);
63 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
65 return (gl->gl_state == LM_ST_SHARED);
68 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
71 spin_lock(&gl->gl_spin);
72 ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
73 spin_unlock(&gl->gl_spin);
77 struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
78 struct lm_lockname *name);
79 int gfs2_glock_get(struct gfs2_sbd *sdp,
80 uint64_t number, struct gfs2_glock_operations *glops,
81 int create, struct gfs2_glock **glp);
82 void gfs2_glock_hold(struct gfs2_glock *gl);
83 int gfs2_glock_put(struct gfs2_glock *gl);
85 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, int flags,
86 struct gfs2_holder *gh);
87 void gfs2_holder_reinit(unsigned int state, int flags, struct gfs2_holder *gh);
88 void gfs2_holder_uninit(struct gfs2_holder *gh);
89 struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state,
90 int flags, gfp_t gfp_flags);
91 void gfs2_holder_put(struct gfs2_holder *gh);
93 void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
94 void gfs2_glock_drop_th(struct gfs2_glock *gl);
96 void gfs2_glmutex_lock(struct gfs2_glock *gl);
97 int gfs2_glmutex_trylock(struct gfs2_glock *gl);
98 void gfs2_glmutex_unlock(struct gfs2_glock *gl);
100 int gfs2_glock_nq(struct gfs2_holder *gh);
101 int gfs2_glock_poll(struct gfs2_holder *gh);
102 int gfs2_glock_wait(struct gfs2_holder *gh);
103 void gfs2_glock_dq(struct gfs2_holder *gh);
105 void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, int flags);
106 void gfs2_glock_force_drop(struct gfs2_glock *gl);
108 int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
110 void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
111 int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
112 uint64_t number, struct gfs2_glock_operations *glops,
113 unsigned int state, int flags, struct gfs2_holder *gh);
115 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
116 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
117 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
119 void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number,
120 struct gfs2_glock_operations *glops,
121 unsigned int state, int flags);
124 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
126 * @state: the state we're requesting
127 * @flags: the modifier flags
128 * @gh: the holder structure
130 * Returns: 0, GLR_*, or errno
133 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
134 unsigned int state, int flags,
135 struct gfs2_holder *gh)
139 gfs2_holder_init(gl, state, flags, gh);
141 error = gfs2_glock_nq(gh);
143 gfs2_holder_uninit(gh);
148 /* Lock Value Block functions */
150 int gfs2_lvb_hold(struct gfs2_glock *gl);
151 void gfs2_lvb_unhold(struct gfs2_glock *gl);
152 void gfs2_lvb_sync(struct gfs2_glock *gl);
154 void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data);
156 void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum);
157 void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
159 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
160 void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
162 void gfs2_scand_internal(struct gfs2_sbd *sdp);
163 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
165 int gfs2_dump_lockstate(struct gfs2_sbd *sdp);
167 #endif /* __GLOCK_DOT_H__ */