2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 2.
10 #ifndef __GLOCK_DOT_H__
11 #define __GLOCK_DOT_H__
15 /* Flags for lock requests; used in gfs2_holder gh_flag field.
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 */
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
29 #define GL_NOCANCEL 0x00001000
30 #define GL_AOP 0x00004000
31 #define GL_DUMP 0x00008000
33 #define GLR_TRYFAILED 13
34 #define GLR_CANCELED 14
36 static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
38 struct gfs2_holder *gh;
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) {
49 spin_unlock(&gl->gl_spin);
54 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
56 return gl->gl_state == LM_ST_EXCLUSIVE;
59 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
61 return gl->gl_state == LM_ST_DEFERRED;
64 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
66 return gl->gl_state == LM_ST_SHARED;
69 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
72 spin_lock(&gl->gl_spin);
73 ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
74 spin_unlock(&gl->gl_spin);
78 int gfs2_glock_get(struct gfs2_sbd *sdp,
79 u64 number, const 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 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
84 struct gfs2_holder *gh);
85 void gfs2_holder_reinit(unsigned int state, unsigned flags,
86 struct gfs2_holder *gh);
87 void gfs2_holder_uninit(struct gfs2_holder *gh);
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);
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);
97 int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
99 void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
100 int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
101 u64 number, const struct gfs2_glock_operations *glops,
102 unsigned int state, int flags, struct gfs2_holder *gh);
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);
108 void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number,
109 const struct gfs2_glock_operations *glops,
110 unsigned int state, int flags);
111 void gfs2_glock_inode_squish(struct inode *inode);
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_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
147 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
148 void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
150 void gfs2_scand_internal(struct gfs2_sbd *sdp);
151 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
153 int __init gfs2_glock_init(void);
155 #endif /* __GLOCK_DOT_H__ */