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_NOCACHE 0x00000400
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
117 const char *lm_proto_name
;
118 int (*lm_mount
) (struct gfs2_sbd
*sdp
, const char *fsname
);
119 void (*lm_unmount
) (struct gfs2_sbd
*sdp
);
120 void (*lm_withdraw
) (struct gfs2_sbd
*sdp
);
121 void (*lm_put_lock
) (struct gfs2_glock
*gl
);
122 int (*lm_lock
) (struct gfs2_glock
*gl
, unsigned int req_state
,
124 void (*lm_cancel
) (struct gfs2_glock
*gl
);
125 const match_table_t
*lm_tokens
;
128 extern struct workqueue_struct
*gfs2_delete_workqueue
;
129 static inline struct gfs2_holder
*gfs2_glock_is_locked_by_me(struct gfs2_glock
*gl
)
131 struct gfs2_holder
*gh
;
134 /* Look in glock's list of holders for one with current task as owner */
135 spin_lock(&gl
->gl_spin
);
136 pid
= task_pid(current
);
137 list_for_each_entry(gh
, &gl
->gl_holders
, gh_list
) {
138 if (!test_bit(HIF_HOLDER
, &gh
->gh_iflags
))
140 if (gh
->gh_owner_pid
== pid
)
145 spin_unlock(&gl
->gl_spin
);
150 static inline int gfs2_glock_is_held_excl(struct gfs2_glock
*gl
)
152 return gl
->gl_state
== LM_ST_EXCLUSIVE
;
155 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock
*gl
)
157 return gl
->gl_state
== LM_ST_DEFERRED
;
160 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock
*gl
)
162 return gl
->gl_state
== LM_ST_SHARED
;
165 static inline struct address_space
*gfs2_glock2aspace(struct gfs2_glock
*gl
)
167 if (gl
->gl_ops
->go_flags
& GLOF_ASPACE
)
168 return (struct address_space
*)(gl
+ 1);
172 int gfs2_glock_get(struct gfs2_sbd
*sdp
,
173 u64 number
, const struct gfs2_glock_operations
*glops
,
174 int create
, struct gfs2_glock
**glp
);
175 void gfs2_glock_hold(struct gfs2_glock
*gl
);
176 void gfs2_glock_put_nolock(struct gfs2_glock
*gl
);
177 void gfs2_glock_put(struct gfs2_glock
*gl
);
178 void gfs2_holder_init(struct gfs2_glock
*gl
, unsigned int state
, unsigned flags
,
179 struct gfs2_holder
*gh
);
180 void gfs2_holder_reinit(unsigned int state
, unsigned flags
,
181 struct gfs2_holder
*gh
);
182 void gfs2_holder_uninit(struct gfs2_holder
*gh
);
183 int gfs2_glock_nq(struct gfs2_holder
*gh
);
184 int gfs2_glock_poll(struct gfs2_holder
*gh
);
185 int gfs2_glock_wait(struct gfs2_holder
*gh
);
186 void gfs2_glock_dq(struct gfs2_holder
*gh
);
187 void gfs2_glock_dq_wait(struct gfs2_holder
*gh
);
189 void gfs2_glock_dq_uninit(struct gfs2_holder
*gh
);
190 int gfs2_glock_nq_num(struct gfs2_sbd
*sdp
,
191 u64 number
, const struct gfs2_glock_operations
*glops
,
192 unsigned int state
, int flags
, struct gfs2_holder
*gh
);
194 int gfs2_glock_nq_m(unsigned int num_gh
, struct gfs2_holder
*ghs
);
195 void gfs2_glock_dq_m(unsigned int num_gh
, struct gfs2_holder
*ghs
);
196 void gfs2_glock_dq_uninit_m(unsigned int num_gh
, struct gfs2_holder
*ghs
);
198 __attribute__ ((format(printf
, 2, 3)))
199 void gfs2_print_dbg(struct seq_file
*seq
, const char *fmt
, ...);
202 * gfs2_glock_nq_init - initialize a holder and enqueue it on a glock
204 * @state: the state we're requesting
205 * @flags: the modifier flags
206 * @gh: the holder structure
208 * Returns: 0, GLR_*, or errno
211 static inline int gfs2_glock_nq_init(struct gfs2_glock
*gl
,
212 unsigned int state
, int flags
,
213 struct gfs2_holder
*gh
)
217 gfs2_holder_init(gl
, state
, flags
, gh
);
219 error
= gfs2_glock_nq(gh
);
221 gfs2_holder_uninit(gh
);
226 extern void gfs2_glock_cb(struct gfs2_glock
*gl
, unsigned int state
);
227 extern void gfs2_glock_complete(struct gfs2_glock
*gl
, int ret
);
228 extern void gfs2_reclaim_glock(struct gfs2_sbd
*sdp
);
229 extern void gfs2_gl_hash_clear(struct gfs2_sbd
*sdp
);
230 extern void gfs2_glock_finish_truncate(struct gfs2_inode
*ip
);
231 extern void gfs2_glock_thaw(struct gfs2_sbd
*sdp
);
232 extern void gfs2_glock_schedule_for_reclaim(struct gfs2_glock
*gl
);
233 extern void gfs2_glock_free(struct gfs2_glock
*gl
);
235 extern int __init
gfs2_glock_init(void);
236 extern void gfs2_glock_exit(void);
238 extern int gfs2_create_debugfs_file(struct gfs2_sbd
*sdp
);
239 extern void gfs2_delete_debugfs_file(struct gfs2_sbd
*sdp
);
240 extern int gfs2_register_debugfs(void);
241 extern void gfs2_unregister_debugfs(void);
243 extern const struct lm_lockops gfs2_dlm_ops
;
245 #endif /* __GLOCK_DOT_H__ */
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