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TOMOYO Linux Cross Reference
Linux/fs/gfs2/glock.h

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  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_NOCACHE              0x00000400
 91   
 92 /*
 93  * lm_async_cb return flags
 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  *
101  */
102 
103 #define LM_OUT_ST_MASK          0x00000003
104 #define LM_OUT_CANCELED         0x00000008
105 #define LM_OUT_ERROR            0x00000004
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 
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 
122 struct lm_lockops {
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,
132                         unsigned int flags);
133         void (*lm_cancel) (struct gfs2_glock *gl);
134         const match_table_t *lm_tokens;
135 };
136 
137 extern struct workqueue_struct *gfs2_delete_workqueue;
138 static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
139 {
140         struct gfs2_holder *gh;
141         struct pid *pid;
142 
143         /* Look in glock's list of holders for one with current task as owner */
144         spin_lock(&gl->gl_spin);
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))
148                         break;
149                 if (gh->gh_owner_pid == pid)
150                         goto out;
151         }
152         gh = NULL;
153 out:
154         spin_unlock(&gl->gl_spin);
155 
156         return gh;
157 }
158 
159 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
160 {
161         return gl->gl_state == LM_ST_EXCLUSIVE;
162 }
163 
164 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
165 {
166         return gl->gl_state == LM_ST_DEFERRED;
167 }
168 
169 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
170 {
171         return gl->gl_state == LM_ST_SHARED;
172 }
173 
174 static 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 
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_hold(struct gfs2_glock *gl);
185 extern void gfs2_glock_put_nolock(struct gfs2_glock *gl);
186 extern void gfs2_glock_put(struct gfs2_glock *gl);
187 extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
188                              unsigned flags, struct gfs2_holder *gh);
189 extern void gfs2_holder_reinit(unsigned int state, unsigned flags,
190                                struct gfs2_holder *gh);
191 extern void gfs2_holder_uninit(struct gfs2_holder *gh);
192 extern int gfs2_glock_nq(struct gfs2_holder *gh);
193 extern int gfs2_glock_poll(struct gfs2_holder *gh);
194 extern int gfs2_glock_wait(struct gfs2_holder *gh);
195 extern void gfs2_glock_dq(struct gfs2_holder *gh);
196 extern void gfs2_glock_dq_wait(struct gfs2_holder *gh);
197 extern void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
198 extern int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number,
199                              const struct gfs2_glock_operations *glops,
200                              unsigned int state, int flags,
201                              struct gfs2_holder *gh);
202 extern int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
203 extern void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
204 extern int gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl);
205 #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { gfs2_dump_glock(NULL, gl); BUG(); } } while(0)
206 extern __printf(2, 3)
207 void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
208 
209 /**
210  * gfs2_glock_nq_init - initialize a holder and enqueue it on a glock
211  * @gl: the glock
212  * @state: the state we're requesting
213  * @flags: the modifier flags
214  * @gh: the holder structure
215  *
216  * Returns: 0, GLR_*, or errno
217  */
218 
219 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
220                                      unsigned int state, int flags,
221                                      struct gfs2_holder *gh)
222 {
223         int error;
224 
225         gfs2_holder_init(gl, state, flags, gh);
226 
227         error = gfs2_glock_nq(gh);
228         if (error)
229                 gfs2_holder_uninit(gh);
230 
231         return error;
232 }
233 
234 extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
235 extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
236 extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
237 extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
238 extern void gfs2_glock_thaw(struct gfs2_sbd *sdp);
239 extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl);
240 extern void gfs2_glock_free(struct gfs2_glock *gl);
241 
242 extern int __init gfs2_glock_init(void);
243 extern void gfs2_glock_exit(void);
244 
245 extern int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
246 extern void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
247 extern int gfs2_register_debugfs(void);
248 extern void gfs2_unregister_debugfs(void);
249 
250 extern const struct lm_lockops gfs2_dlm_ops;
251 
252 #endif /* __GLOCK_DOT_H__ */
253 

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