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_AOP 0x00004000
31 #define GLR_TRYFAILED 13
32 #define GLR_CANCELED 14
34 static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
36 struct gfs2_holder *gh;
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) {
47 spin_unlock(&gl->gl_spin);
52 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
54 return (gl->gl_state == LM_ST_EXCLUSIVE);
57 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
59 return (gl->gl_state == LM_ST_DEFERRED);
62 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
64 return (gl->gl_state == LM_ST_SHARED);
67 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
70 spin_lock(&gl->gl_spin);
71 ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
72 spin_unlock(&gl->gl_spin);
76 int gfs2_glock_get(struct gfs2_sbd *sdp,
77 uint64_t number, struct gfs2_glock_operations *glops,
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);
81 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
82 struct gfs2_holder *gh);
83 void gfs2_holder_reinit(unsigned int state, unsigned flags,
84 struct gfs2_holder *gh);
85 void gfs2_holder_uninit(struct gfs2_holder *gh);
87 void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
88 void gfs2_glock_drop_th(struct gfs2_glock *gl);
90 void gfs2_glmutex_lock(struct gfs2_glock *gl);
91 void gfs2_glmutex_unlock(struct gfs2_glock *gl);
93 int gfs2_glock_nq(struct gfs2_holder *gh);
94 int gfs2_glock_poll(struct gfs2_holder *gh);
95 int gfs2_glock_wait(struct gfs2_holder *gh);
96 void gfs2_glock_dq(struct gfs2_holder *gh);
98 int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
100 void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
101 int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
102 uint64_t number, struct gfs2_glock_operations *glops,
103 unsigned int state, int flags, struct gfs2_holder *gh);
105 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
106 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
107 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
109 void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number,
110 struct gfs2_glock_operations *glops,
111 unsigned int state, int flags);
114 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
116 * @state: the state we're requesting
117 * @flags: the modifier flags
118 * @gh: the holder structure
120 * Returns: 0, GLR_*, or errno
123 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
124 unsigned int state, int flags,
125 struct gfs2_holder *gh)
129 gfs2_holder_init(gl, state, flags, gh);
131 error = gfs2_glock_nq(gh);
133 gfs2_holder_uninit(gh);
138 /* Lock Value Block functions */
140 int gfs2_lvb_hold(struct gfs2_glock *gl);
141 void gfs2_lvb_unhold(struct gfs2_glock *gl);
143 void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data);
145 void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum);
146 void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
148 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
149 void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
151 void gfs2_scand_internal(struct gfs2_sbd *sdp);
152 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
154 #endif /* __GLOCK_DOT_H__ */