1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 2.
8 */
9
10 #ifndef __GLOCK_DOT_H__
11 #define __GLOCK_DOT_H__
12
13 #include <linux/sched.h>
14 #include <linux/parser.h>
15 #include "incore.h"
16
17 /* Options for hostdata parser */
18
19 enum {
20 Opt_jid,
21 Opt_id,
22 Opt_first,
23 Opt_nodir,
24 Opt_err,
25 };
26
27 /*
28 * lm_lockname types
29 */
30
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
41
42 /*
43 * lm_lock() states
44 *
45 * SHARED is compatible with SHARED, not with DEFERRED or EX.
46 * DEFERRED is compatible with DEFERRED, not with SHARED or EX.
47 */
48
49 #define LM_ST_UNLOCKED 0
50 #define LM_ST_EXCLUSIVE 1
51 #define LM_ST_DEFERRED 2
52 #define LM_ST_SHARED 3
53
54 /*
55 * lm_lock() flags
56 *
57 * LM_FLAG_TRY
58 * Don't wait to acquire the lock if it can't be granted immediately.
59 *
60 * LM_FLAG_TRY_1CB
61 * Send one blocking callback if TRY is set and the lock is not granted.
62 *
63 * LM_FLAG_NOEXP
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.
67 *
68 * LM_FLAG_ANY
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.
72 *
73 * LM_FLAG_PRIORITY
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.
80 */
81
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
92
93 /*
94 * lm_lock() and lm_async_cb return flags
95 *
96 * LM_OUT_ST_MASK
97 * Masks the lower two bits of lock state in the returned value.
98 *
99 * LM_OUT_CANCELED
100 * The lock request was canceled.
101 *
102 * LM_OUT_ASYNC
103 * The result of the request will be returned in an LM_CB_ASYNC callback.
104 *
105 */
106
107 #define LM_OUT_ST_MASK 0x00000003
108 #define LM_OUT_CANCELED 0x00000008
109 #define LM_OUT_ASYNC 0x00000080
110 #define LM_OUT_ERROR 0x00000100
111
112 /*
113 * lm_recovery_done() messages
114 */
115
116 #define LM_RD_GAVEUP 308
117 #define LM_RD_SUCCESS 309
118
119 #define GLR_TRYFAILED 13
120
121 struct lm_lockops {
122 const char *lm_proto_name;
123 int (*lm_mount) (struct gfs2_sbd *sdp, const char *fsname);
124 void (*lm_unmount) (struct gfs2_sbd *sdp);
125 void (*lm_withdraw) (struct gfs2_sbd *sdp);
126 void (*lm_put_lock) (struct kmem_cache *cachep, void *gl);
127 unsigned int (*lm_lock) (struct gfs2_glock *gl,
128 unsigned int req_state, unsigned int flags);
129 void (*lm_cancel) (struct gfs2_glock *gl);
130 const match_table_t *lm_tokens;
131 };
132
133 #define LM_FLAG_TRY 0x00000001
134 #define LM_FLAG_TRY_1CB 0x00000002
135 #define LM_FLAG_NOEXP 0x00000004
136 #define LM_FLAG_ANY 0x00000008
137 #define LM_FLAG_PRIORITY 0x00000010
138
139 #define GL_ASYNC 0x00000040
140 #define GL_EXACT 0x00000080
141 #define GL_SKIP 0x00000100
142 #define GL_NOCACHE 0x00000400
143
144 #define GLR_TRYFAILED 13
145
146 extern struct workqueue_struct *gfs2_delete_workqueue;
147 static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
148 {
149 struct gfs2_holder *gh;
150 struct pid *pid;
151
152 /* Look in glock's list of holders for one with current task as owner */
153 spin_lock(&gl->gl_spin);
154 pid = task_pid(current);
155 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
156 if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
157 break;
158 if (gh->gh_owner_pid == pid)
159 goto out;
160 }
161 gh = NULL;
162 out:
163 spin_unlock(&gl->gl_spin);
164
165 return gh;
166 }
167
168 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
169 {
170 return gl->gl_state == LM_ST_EXCLUSIVE;
171 }
172
173 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
174 {
175 return gl->gl_state == LM_ST_DEFERRED;
176 }
177
178 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
179 {
180 return gl->gl_state == LM_ST_SHARED;
181 }
182
183 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
184 {
185 int ret;
186 spin_lock(&gl->gl_spin);
187 ret = test_bit(GLF_DEMOTE, &gl->gl_flags);
188 spin_unlock(&gl->gl_spin);
189 return ret;
190 }
191
192 int gfs2_glock_get(struct gfs2_sbd *sdp,
193 u64 number, const struct gfs2_glock_operations *glops,
194 int create, struct gfs2_glock **glp);
195 void gfs2_glock_hold(struct gfs2_glock *gl);
196 void gfs2_glock_put_nolock(struct gfs2_glock *gl);
197 int gfs2_glock_put(struct gfs2_glock *gl);
198 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
199 struct gfs2_holder *gh);
200 void gfs2_holder_reinit(unsigned int state, unsigned flags,
201 struct gfs2_holder *gh);
202 void gfs2_holder_uninit(struct gfs2_holder *gh);
203 int gfs2_glock_nq(struct gfs2_holder *gh);
204 int gfs2_glock_poll(struct gfs2_holder *gh);
205 int gfs2_glock_wait(struct gfs2_holder *gh);
206 void gfs2_glock_dq(struct gfs2_holder *gh);
207 void gfs2_glock_dq_wait(struct gfs2_holder *gh);
208
209 void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
210 int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
211 u64 number, const struct gfs2_glock_operations *glops,
212 unsigned int state, int flags, struct gfs2_holder *gh);
213
214 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
215 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
216 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
217 void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
218
219 /**
220 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
221 * @gl: the glock
222 * @state: the state we're requesting
223 * @flags: the modifier flags
224 * @gh: the holder structure
225 *
226 * Returns: 0, GLR_*, or errno
227 */
228
229 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
230 unsigned int state, int flags,
231 struct gfs2_holder *gh)
232 {
233 int error;
234
235 gfs2_holder_init(gl, state, flags, gh);
236
237 error = gfs2_glock_nq(gh);
238 if (error)
239 gfs2_holder_uninit(gh);
240
241 return error;
242 }
243
244 /* Lock Value Block functions */
245
246 int gfs2_lvb_hold(struct gfs2_glock *gl);
247 void gfs2_lvb_unhold(struct gfs2_glock *gl);
248
249 void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
250 void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
251 void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
252 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
253 void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
254 void gfs2_glock_thaw(struct gfs2_sbd *sdp);
255
256 int __init gfs2_glock_init(void);
257 void gfs2_glock_exit(void);
258
259 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
260 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
261 int gfs2_register_debugfs(void);
262 void gfs2_unregister_debugfs(void);
263
264 extern const struct lm_lockops gfs2_dlm_ops;
265
266 #endif /* __GLOCK_DOT_H__ */
267
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