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__
13 #include <linux/sched.h>
14 #include <linux/parser.h>
17 /* Options for hostdata parser */
31 #define LM_TYPE_RESERVED 0x00
32 #define LM_TYPE_NONDISK 0x01
33 #define LM_TYPE_INODE 0x02
34 #define LM_TYPE_RGRP 0x03
35 #define LM_TYPE_META 0x04
36 #define LM_TYPE_IOPEN 0x05
37 #define LM_TYPE_FLOCK 0x06
38 #define LM_TYPE_PLOCK 0x07
39 #define LM_TYPE_QUOTA 0x08
40 #define LM_TYPE_JOURNAL 0x09
45 * SHARED is compatible with SHARED, not with DEFERRED or EX.
46 * DEFERRED is compatible with DEFERRED, not with SHARED or EX.
49 #define LM_ST_UNLOCKED 0
50 #define LM_ST_EXCLUSIVE 1
51 #define LM_ST_DEFERRED 2
52 #define LM_ST_SHARED 3
58 * Don't wait to acquire the lock if it can't be granted immediately.
61 * Send one blocking callback if TRY is set and the lock is not granted.
64 * GFS sets this flag on lock requests it makes while doing journal recovery.
65 * These special requests should not be blocked due to the recovery like
66 * ordinary locks would be.
69 * A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
70 * also be granted in SHARED. The preferred state is whichever is compatible
71 * with other granted locks, or the specified state if no other locks exist.
74 * Override fairness considerations. Suppose a lock is held in a shared state
75 * and there is a pending request for the deferred state. A shared lock
76 * request with the priority flag would be allowed to bypass the deferred
77 * request and directly join the other shared lock. A shared lock request
78 * without the priority flag might be forced to wait until the deferred
79 * requested had acquired and released the lock.
82 #define LM_FLAG_TRY 0x00000001
83 #define LM_FLAG_TRY_1CB 0x00000002
84 #define LM_FLAG_NOEXP 0x00000004
85 #define LM_FLAG_ANY 0x00000008
86 #define LM_FLAG_PRIORITY 0x00000010
87 #define GL_ASYNC 0x00000040
88 #define GL_EXACT 0x00000080
89 #define GL_SKIP 0x00000100
90 #define GL_ATIME 0x00000200
91 #define GL_NOCACHE 0x00000400
94 * lm_async_cb return flags
97 * Masks the lower two bits of lock state in the returned value.
100 * The lock request was canceled.
104 #define LM_OUT_ST_MASK 0x00000003
105 #define LM_OUT_CANCELED 0x00000008
106 #define LM_OUT_ERROR 0x00000004
109 * lm_recovery_done() messages
112 #define LM_RD_GAVEUP 308
113 #define LM_RD_SUCCESS 309
115 #define GLR_TRYFAILED 13
118 const char *lm_proto_name;
119 int (*lm_mount) (struct gfs2_sbd *sdp, const char *fsname);
120 void (*lm_unmount) (struct gfs2_sbd *sdp);
121 void (*lm_withdraw) (struct gfs2_sbd *sdp);
122 void (*lm_put_lock) (struct kmem_cache *cachep, struct gfs2_glock *gl);
123 int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state,
125 void (*lm_cancel) (struct gfs2_glock *gl);
126 const match_table_t *lm_tokens;
129 #define LM_FLAG_TRY 0x00000001
130 #define LM_FLAG_TRY_1CB 0x00000002
131 #define LM_FLAG_NOEXP 0x00000004
132 #define LM_FLAG_ANY 0x00000008
133 #define LM_FLAG_PRIORITY 0x00000010
135 #define GL_ASYNC 0x00000040
136 #define GL_EXACT 0x00000080
137 #define GL_SKIP 0x00000100
138 #define GL_NOCACHE 0x00000400
140 #define GLR_TRYFAILED 13
142 extern struct workqueue_struct *gfs2_delete_workqueue;
143 static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
145 struct gfs2_holder *gh;
148 /* Look in glock's list of holders for one with current task as owner */
149 spin_lock(&gl->gl_spin);
150 pid = task_pid(current);
151 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
152 if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
154 if (gh->gh_owner_pid == pid)
159 spin_unlock(&gl->gl_spin);
164 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
166 return gl->gl_state == LM_ST_EXCLUSIVE;
169 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
171 return gl->gl_state == LM_ST_DEFERRED;
174 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
176 return gl->gl_state == LM_ST_SHARED;
179 static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl)
181 if (gl->gl_ops->go_flags & GLOF_ASPACE)
182 return (struct address_space *)(gl + 1);
186 int gfs2_glock_get(struct gfs2_sbd *sdp,
187 u64 number, const struct gfs2_glock_operations *glops,
188 int create, struct gfs2_glock **glp);
189 void gfs2_glock_hold(struct gfs2_glock *gl);
190 void gfs2_glock_put_nolock(struct gfs2_glock *gl);
191 int gfs2_glock_put(struct gfs2_glock *gl);
192 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
193 struct gfs2_holder *gh);
194 void gfs2_holder_reinit(unsigned int state, unsigned flags,
195 struct gfs2_holder *gh);
196 void gfs2_holder_uninit(struct gfs2_holder *gh);
197 int gfs2_glock_nq(struct gfs2_holder *gh);
198 int gfs2_glock_poll(struct gfs2_holder *gh);
199 int gfs2_glock_wait(struct gfs2_holder *gh);
200 void gfs2_glock_dq(struct gfs2_holder *gh);
201 void gfs2_glock_dq_wait(struct gfs2_holder *gh);
203 void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
204 int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
205 u64 number, const struct gfs2_glock_operations *glops,
206 unsigned int state, int flags, struct gfs2_holder *gh);
208 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
209 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
210 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
212 __attribute__ ((format(printf, 2, 3)))
213 void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
216 * gfs2_glock_nq_init - initialize a holder and enqueue it on a glock
218 * @state: the state we're requesting
219 * @flags: the modifier flags
220 * @gh: the holder structure
222 * Returns: 0, GLR_*, or errno
225 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
226 unsigned int state, int flags,
227 struct gfs2_holder *gh)
231 gfs2_holder_init(gl, state, flags, gh);
233 error = gfs2_glock_nq(gh);
235 gfs2_holder_uninit(gh);
240 /* Lock Value Block functions */
242 int gfs2_lvb_hold(struct gfs2_glock *gl);
243 void gfs2_lvb_unhold(struct gfs2_glock *gl);
245 void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
246 void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
247 void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
248 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
249 void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
250 void gfs2_glock_thaw(struct gfs2_sbd *sdp);
252 int __init gfs2_glock_init(void);
253 void gfs2_glock_exit(void);
255 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
256 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
257 int gfs2_register_debugfs(void);
258 void gfs2_unregister_debugfs(void);
260 extern const struct lm_lockops gfs2_dlm_ops;
262 #endif /* __GLOCK_DOT_H__ */