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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 | ||
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 | ||
b3b94faa DT |
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 | |
f057f6cd SW |
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); | |
8f05228e | 126 | void (*lm_put_lock) (struct kmem_cache *cachep, struct gfs2_glock *gl); |
f057f6cd SW |
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 | |
b3b94faa | 138 | |
b3b94faa DT |
139 | #define GL_ASYNC 0x00000040 |
140 | #define GL_EXACT 0x00000080 | |
141 | #define GL_SKIP 0x00000100 | |
b3b94faa | 142 | #define GL_NOCACHE 0x00000400 |
b3b94faa DT |
143 | |
144 | #define GLR_TRYFAILED 13 | |
b3b94faa | 145 | |
b94a170e | 146 | extern struct workqueue_struct *gfs2_delete_workqueue; |
7afd88d9 | 147 | static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) |
b3b94faa DT |
148 | { |
149 | struct gfs2_holder *gh; | |
b1e058da | 150 | struct pid *pid; |
b3b94faa DT |
151 | |
152 | /* Look in glock's list of holders for one with current task as owner */ | |
153 | spin_lock(&gl->gl_spin); | |
b1e058da | 154 | pid = task_pid(current); |
b3b94faa | 155 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
6802e340 SW |
156 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) |
157 | break; | |
7afd88d9 SW |
158 | if (gh->gh_owner_pid == pid) |
159 | goto out; | |
b3b94faa | 160 | } |
7afd88d9 SW |
161 | gh = NULL; |
162 | out: | |
b3b94faa DT |
163 | spin_unlock(&gl->gl_spin); |
164 | ||
7afd88d9 | 165 | return gh; |
b3b94faa DT |
166 | } |
167 | ||
168 | static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) | |
169 | { | |
50299965 | 170 | return gl->gl_state == LM_ST_EXCLUSIVE; |
b3b94faa DT |
171 | } |
172 | ||
173 | static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) | |
174 | { | |
50299965 | 175 | return gl->gl_state == LM_ST_DEFERRED; |
b3b94faa DT |
176 | } |
177 | ||
178 | static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) | |
179 | { | |
50299965 | 180 | return gl->gl_state == LM_ST_SHARED; |
b3b94faa DT |
181 | } |
182 | ||
009d8518 SW |
183 | static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl) |
184 | { | |
185 | if (gl->gl_ops->go_flags & GLOF_ASPACE) | |
186 | return (struct address_space *)(gl + 1); | |
187 | return NULL; | |
188 | } | |
189 | ||
b3b94faa | 190 | int gfs2_glock_get(struct gfs2_sbd *sdp, |
cd915493 | 191 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa | 192 | int create, struct gfs2_glock **glp); |
b94a170e BM |
193 | void gfs2_glock_hold(struct gfs2_glock *gl); |
194 | void gfs2_glock_put_nolock(struct gfs2_glock *gl); | |
b3b94faa | 195 | int gfs2_glock_put(struct gfs2_glock *gl); |
190562bd | 196 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa | 197 | struct gfs2_holder *gh); |
190562bd SW |
198 | void gfs2_holder_reinit(unsigned int state, unsigned flags, |
199 | struct gfs2_holder *gh); | |
b3b94faa | 200 | void gfs2_holder_uninit(struct gfs2_holder *gh); |
b3b94faa DT |
201 | int gfs2_glock_nq(struct gfs2_holder *gh); |
202 | int gfs2_glock_poll(struct gfs2_holder *gh); | |
203 | int gfs2_glock_wait(struct gfs2_holder *gh); | |
204 | void gfs2_glock_dq(struct gfs2_holder *gh); | |
d93cfa98 | 205 | void gfs2_glock_dq_wait(struct gfs2_holder *gh); |
b3b94faa | 206 | |
b3b94faa DT |
207 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
208 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, | |
cd915493 | 209 | u64 number, const struct gfs2_glock_operations *glops, |
b3b94faa DT |
210 | unsigned int state, int flags, struct gfs2_holder *gh); |
211 | ||
212 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
213 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
214 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); | |
6802e340 | 215 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); |
b3b94faa | 216 | |
d0dc80db SW |
217 | /** |
218 | * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock | |
219 | * @gl: the glock | |
220 | * @state: the state we're requesting | |
221 | * @flags: the modifier flags | |
222 | * @gh: the holder structure | |
223 | * | |
224 | * Returns: 0, GLR_*, or errno | |
225 | */ | |
226 | ||
227 | static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, | |
228 | unsigned int state, int flags, | |
229 | struct gfs2_holder *gh) | |
230 | { | |
231 | int error; | |
232 | ||
233 | gfs2_holder_init(gl, state, flags, gh); | |
234 | ||
235 | error = gfs2_glock_nq(gh); | |
236 | if (error) | |
237 | gfs2_holder_uninit(gh); | |
238 | ||
239 | return error; | |
240 | } | |
241 | ||
b3b94faa DT |
242 | /* Lock Value Block functions */ |
243 | ||
244 | int gfs2_lvb_hold(struct gfs2_glock *gl); | |
245 | void gfs2_lvb_unhold(struct gfs2_glock *gl); | |
b3b94faa | 246 | |
f057f6cd SW |
247 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state); |
248 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret); | |
b3b94faa | 249 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp); |
fefc03bf | 250 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); |
813e0c46 | 251 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip); |
f057f6cd | 252 | void gfs2_glock_thaw(struct gfs2_sbd *sdp); |
b3b94faa | 253 | |
85d1da67 | 254 | int __init gfs2_glock_init(void); |
8fbbfd21 SW |
255 | void gfs2_glock_exit(void); |
256 | ||
7c52b166 RP |
257 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); |
258 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); | |
259 | int gfs2_register_debugfs(void); | |
260 | void gfs2_unregister_debugfs(void); | |
85d1da67 | 261 | |
f057f6cd SW |
262 | extern const struct lm_lockops gfs2_dlm_ops; |
263 | ||
b3b94faa | 264 | #endif /* __GLOCK_DOT_H__ */ |