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Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[mirror_ubuntu-artful-kernel.git] / fs / gfs2 / glock.h
CommitLineData
b3b94faa
DT		 1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa
DT		 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
e9fc2aa0 7 * of the GNU General Public License version 2.
b3b94faa
DT		 8 */
9
10#ifndef __GLOCK_DOT_H__
11#define __GLOCK_DOT_H__
12
e8edc6e0 13#include <linux/sched.h>
f057f6cd 14#include <linux/parser.h>
f2f7ba52
SW		 15#include "incore.h"
16
f057f6cd
SW		 17/* Options for hostdata parser */
18
19enum {
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
b58bf407
BP		 82#define LM_FLAG_TRY 0x0001
83#define LM_FLAG_TRY_1CB 0x0002
84#define LM_FLAG_NOEXP 0x0004
85#define LM_FLAG_ANY 0x0008
86#define LM_FLAG_PRIORITY 0x0010
87#define GL_ASYNC 0x0040
88#define GL_EXACT 0x0080
89#define GL_SKIP 0x0100
90#define GL_NOCACHE 0x0400
f057f6cd
SW		 91
92/*
921169ca 93 * lm_async_cb return flags
f057f6cd
SW		 94 *
95 * LM_OUT_ST_MASK
96 * Masks the lower two bits of lock state in the returned value.
97 *
98 * LM_OUT_CANCELED
99 * The lock request was canceled.
100 *
f057f6cd
SW		 101 */
102
103#define LM_OUT_ST_MASK 0x00000003
104#define LM_OUT_CANCELED 0x00000008
921169ca 105#define LM_OUT_ERROR 0x00000004
f057f6cd
SW		 106
107/*
108 * lm_recovery_done() messages
109 */
110
111#define LM_RD_GAVEUP 308
112#define LM_RD_SUCCESS 309
113
114#define GLR_TRYFAILED 13
115
7cf8dcd3
BP		 116#define GL_GLOCK_MAX_HOLD (long)(HZ / 5)
117#define GL_GLOCK_DFT_HOLD (long)(HZ / 5)
118#define GL_GLOCK_MIN_HOLD (long)(10)
119#define GL_GLOCK_HOLD_INCR (long)(HZ / 20)
120#define GL_GLOCK_HOLD_DECR (long)(HZ / 40)
121
f057f6cd
SW		 122struct lm_lockops {
123 const char *lm_proto_name;
e0c2a9aa
DT		 124 int (*lm_mount) (struct gfs2_sbd *sdp, const char *table);
125 void (*lm_first_done) (struct gfs2_sbd *sdp);
126 void (*lm_recovery_result) (struct gfs2_sbd *sdp, unsigned int jid,
127 unsigned int result);
128 void (*lm_unmount) (struct gfs2_sbd *sdp);
f057f6cd 129 void (*lm_withdraw) (struct gfs2_sbd *sdp);
bc015cb8 130 void (*lm_put_lock) (struct gfs2_glock *gl);
921169ca
SW		 131 int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state,
132 unsigned int flags);
f057f6cd
SW		 133 void (*lm_cancel) (struct gfs2_glock *gl);
134 const match_table_t *lm_tokens;
135};
136
b94a170e 137extern struct workqueue_struct *gfs2_delete_workqueue;
7afd88d9 138static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
b3b94faa
DT		 139{
140 struct gfs2_holder *gh;
b1e058da 141 struct pid *pid;
b3b94faa
DT		 142
143 /* Look in glock's list of holders for one with current task as owner */
f3dd1649 144 spin_lock(&gl->gl_lockref.lock);
b1e058da 145 pid = task_pid(current);
b3b94faa 146 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
6802e340
SW		 147 if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
148 break;
7afd88d9
SW		 149 if (gh->gh_owner_pid == pid)
150 goto out;
b3b94faa 151 }
7afd88d9
SW		 152 gh = NULL;
153out:
f3dd1649 154 spin_unlock(&gl->gl_lockref.lock);
b3b94faa 155
7afd88d9 156 return gh;
b3b94faa
DT		 157}
158
159static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
160{
50299965 161 return gl->gl_state == LM_ST_EXCLUSIVE;
b3b94faa
DT		 162}
163
164static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
165{
50299965 166 return gl->gl_state == LM_ST_DEFERRED;
b3b94faa
DT		 167}
168
169static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
170{
50299965 171 return gl->gl_state == LM_ST_SHARED;
b3b94faa
DT		 172}
173
009d8518
SW		 174static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl)
175{
176 if (gl->gl_ops->go_flags & GLOF_ASPACE)
177 return (struct address_space *)(gl + 1);
178 return NULL;
179}
180
8eae1ca0
SW		 181extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
182 const struct gfs2_glock_operations *glops,
183 int create, struct gfs2_glock **glp);
8eae1ca0
SW		 184extern void gfs2_glock_put(struct gfs2_glock *gl);
185extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
b58bf407
BP		 186 u16 flags, struct gfs2_holder *gh);
187extern void gfs2_holder_reinit(unsigned int state, u16 flags,
8eae1ca0
SW		 188 struct gfs2_holder *gh);
189extern void gfs2_holder_uninit(struct gfs2_holder *gh);
190extern int gfs2_glock_nq(struct gfs2_holder *gh);
191extern int gfs2_glock_poll(struct gfs2_holder *gh);
192extern int gfs2_glock_wait(struct gfs2_holder *gh);
193extern void gfs2_glock_dq(struct gfs2_holder *gh);
194extern void gfs2_glock_dq_wait(struct gfs2_holder *gh);
195extern void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
196extern int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number,
197 const struct gfs2_glock_operations *glops,
b58bf407 198 unsigned int state, u16 flags,
8eae1ca0
SW		 199 struct gfs2_holder *gh);
200extern int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
201extern void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
ac3beb6a 202extern void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl);
8eae1ca0
SW		 203#define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { gfs2_dump_glock(NULL, gl); BUG(); } } while(0)
204extern __printf(2, 3)
6802e340 205void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
b3b94faa 206
d0dc80db 207/**
33027af6 208 * gfs2_glock_nq_init - initialize a holder and enqueue it on a glock
d0dc80db
SW		 209 * @gl: the glock
210 * @state: the state we're requesting
211 * @flags: the modifier flags
212 * @gh: the holder structure
213 *
214 * Returns: 0, GLR_*, or errno
215 */
216
217static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
b58bf407 218 unsigned int state, u16 flags,
d0dc80db
SW		 219 struct gfs2_holder *gh)
220{
221 int error;
222
223 gfs2_holder_init(gl, state, flags, gh);
224
225 error = gfs2_glock_nq(gh);
226 if (error)
227 gfs2_holder_uninit(gh);
228
229 return error;
230}
231
bc015cb8
SW		 232extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
233extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
bc015cb8
SW		 234extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
235extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
236extern void gfs2_glock_thaw(struct gfs2_sbd *sdp);
29687a2a 237extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl);
fc0e38da 238extern void gfs2_glock_free(struct gfs2_glock *gl);
bc015cb8
SW		 239
240extern int __init gfs2_glock_init(void);
241extern void gfs2_glock_exit(void);
242
243extern int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
244extern void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
245extern int gfs2_register_debugfs(void);
246extern void gfs2_unregister_debugfs(void);
85d1da67 247
f057f6cd
SW		 248extern const struct lm_lockops gfs2_dlm_ops;
249
6df9f9a2
AG		 250static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder *gh)
251{
252 gh->gh_gl = NULL;
253}
254
255static inline bool gfs2_holder_initialized(struct gfs2_holder *gh)
256{
257 return gh->gh_gl;
258}
259
4fd1a579
AG		 260static inline void glock_set_object(struct gfs2_glock *gl, void *object)
261{
262 spin_lock(&gl->gl_lockref.lock);
263 gl->gl_object = object;
264 spin_unlock(&gl->gl_lockref.lock);
265}
266
b3b94faa 267#endif /* __GLOCK_DOT_H__ */
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