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 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
93 * lm_async_cb return flags
96 * Masks the lower two bits of lock state in the returned value.
99 * The lock request was canceled.
103 #define LM_OUT_ST_MASK 0x00000003
104 #define LM_OUT_CANCELED 0x00000008
105 #define LM_OUT_ERROR 0x00000004
108 * lm_recovery_done() messages
111 #define LM_RD_GAVEUP 308
112 #define LM_RD_SUCCESS 309
114 #define GLR_TRYFAILED 13
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)
123 const char *lm_proto_name
;
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
);
129 void (*lm_withdraw
) (struct gfs2_sbd
*sdp
);
130 void (*lm_put_lock
) (struct gfs2_glock
*gl
);
131 int (*lm_lock
) (struct gfs2_glock
*gl
, unsigned int req_state
,
133 void (*lm_cancel
) (struct gfs2_glock
*gl
);
134 const match_table_t
*lm_tokens
;
137 extern struct workqueue_struct
*gfs2_delete_workqueue
;
138 static inline struct gfs2_holder
*gfs2_glock_is_locked_by_me(struct gfs2_glock
*gl
)
140 struct gfs2_holder
*gh
;
143 /* Look in glock's list of holders for one with current task as owner */
144 spin_lock(&gl
->gl_lockref
.lock
);
145 pid
= task_pid(current
);
146 list_for_each_entry(gh
, &gl
->gl_holders
, gh_list
) {
147 if (!test_bit(HIF_HOLDER
, &gh
->gh_iflags
))
149 if (gh
->gh_owner_pid
== pid
)
154 spin_unlock(&gl
->gl_lockref
.lock
);
159 static inline int gfs2_glock_is_held_excl(struct gfs2_glock
*gl
)
161 return gl
->gl_state
== LM_ST_EXCLUSIVE
;
164 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock
*gl
)
166 return gl
->gl_state
== LM_ST_DEFERRED
;
169 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock
*gl
)
171 return gl
->gl_state
== LM_ST_SHARED
;
174 static inline struct address_space
*gfs2_glock2aspace(struct gfs2_glock
*gl
)
176 if (gl
->gl_ops
->go_flags
& GLOF_ASPACE
)
177 return (struct address_space
*)(gl
+ 1);
181 extern int gfs2_glock_get(struct gfs2_sbd
*sdp
, u64 number
,
182 const struct gfs2_glock_operations
*glops
,
183 int create
, struct gfs2_glock
**glp
);
184 extern void gfs2_glock_put(struct gfs2_glock
*gl
);
185 extern void gfs2_holder_init(struct gfs2_glock
*gl
, unsigned int state
,
186 u16 flags
, struct gfs2_holder
*gh
);
187 extern void gfs2_holder_reinit(unsigned int state
, u16 flags
,
188 struct gfs2_holder
*gh
);
189 extern void gfs2_holder_uninit(struct gfs2_holder
*gh
);
190 extern int gfs2_glock_nq(struct gfs2_holder
*gh
);
191 extern int gfs2_glock_poll(struct gfs2_holder
*gh
);
192 extern int gfs2_glock_wait(struct gfs2_holder
*gh
);
193 extern void gfs2_glock_dq(struct gfs2_holder
*gh
);
194 extern void gfs2_glock_dq_wait(struct gfs2_holder
*gh
);
195 extern void gfs2_glock_dq_uninit(struct gfs2_holder
*gh
);
196 extern int gfs2_glock_nq_num(struct gfs2_sbd
*sdp
, u64 number
,
197 const struct gfs2_glock_operations
*glops
,
198 unsigned int state
, u16 flags
,
199 struct gfs2_holder
*gh
);
200 extern int gfs2_glock_nq_m(unsigned int num_gh
, struct gfs2_holder
*ghs
);
201 extern void gfs2_glock_dq_m(unsigned int num_gh
, struct gfs2_holder
*ghs
);
202 extern void gfs2_dump_glock(struct seq_file
*seq
, const struct gfs2_glock
*gl
);
203 #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { gfs2_dump_glock(NULL, gl); BUG(); } } while(0)
204 extern __printf(2, 3)
205 void gfs2_print_dbg(struct seq_file
*seq
, const char *fmt
, ...);
208 * gfs2_glock_nq_init - initialize a holder and enqueue it on a glock
210 * @state: the state we're requesting
211 * @flags: the modifier flags
212 * @gh: the holder structure
214 * Returns: 0, GLR_*, or errno
217 static inline int gfs2_glock_nq_init(struct gfs2_glock
*gl
,
218 unsigned int state
, u16 flags
,
219 struct gfs2_holder
*gh
)
223 gfs2_holder_init(gl
, state
, flags
, gh
);
225 error
= gfs2_glock_nq(gh
);
227 gfs2_holder_uninit(gh
);
232 extern void gfs2_glock_cb(struct gfs2_glock
*gl
, unsigned int state
);
233 extern void gfs2_glock_complete(struct gfs2_glock
*gl
, int ret
);
234 extern void gfs2_gl_hash_clear(struct gfs2_sbd
*sdp
);
235 extern void gfs2_glock_finish_truncate(struct gfs2_inode
*ip
);
236 extern void gfs2_glock_thaw(struct gfs2_sbd
*sdp
);
237 extern void gfs2_glock_add_to_lru(struct gfs2_glock
*gl
);
238 extern void gfs2_glock_free(struct gfs2_glock
*gl
);
240 extern int __init
gfs2_glock_init(void);
241 extern void gfs2_glock_exit(void);
243 extern int gfs2_create_debugfs_file(struct gfs2_sbd
*sdp
);
244 extern void gfs2_delete_debugfs_file(struct gfs2_sbd
*sdp
);
245 extern int gfs2_register_debugfs(void);
246 extern void gfs2_unregister_debugfs(void);
248 extern const struct lm_lockops gfs2_dlm_ops
;
250 static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder
*gh
)
255 static inline bool gfs2_holder_initialized(struct gfs2_holder
*gh
)
260 #endif /* __GLOCK_DOT_H__ */