Commit | Line | Data |
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869d81df DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 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 v.2. | |
8 | */ | |
29b7998d DT |
9 | |
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/smp_lock.h> | |
17 | ||
18 | #include "../../lm_interface.h" | |
19 | ||
20 | struct nolock_lockspace { | |
21 | unsigned int nl_lvb_size; | |
22 | }; | |
23 | ||
24 | struct lm_lockops nolock_ops; | |
25 | ||
29b7998d DT |
26 | static int nolock_mount(char *table_name, char *host_data, |
27 | lm_callback_t cb, lm_fsdata_t *fsdata, | |
28 | unsigned int min_lvb_size, int flags, | |
869d81df DT |
29 | struct lm_lockstruct *lockstruct, |
30 | struct kobject *fskobj) | |
29b7998d DT |
31 | { |
32 | char *c; | |
33 | unsigned int jid; | |
34 | struct nolock_lockspace *nl; | |
35 | ||
36 | /* If there is a "jid=" in the hostdata, return that jid. | |
37 | Otherwise, return zero. */ | |
38 | ||
39 | c = strstr(host_data, "jid="); | |
40 | if (!c) | |
41 | jid = 0; | |
42 | else { | |
43 | c += 4; | |
44 | sscanf(c, "%u", &jid); | |
45 | } | |
46 | ||
d92a8d48 | 47 | nl = kzalloc(sizeof(struct nolock_lockspace), GFP_KERNEL); |
29b7998d DT |
48 | if (!nl) |
49 | return -ENOMEM; | |
50 | ||
29b7998d DT |
51 | nl->nl_lvb_size = min_lvb_size; |
52 | ||
53 | lockstruct->ls_jid = jid; | |
54 | lockstruct->ls_first = 1; | |
55 | lockstruct->ls_lvb_size = min_lvb_size; | |
56 | lockstruct->ls_lockspace = (lm_lockspace_t *)nl; | |
57 | lockstruct->ls_ops = &nolock_ops; | |
58 | lockstruct->ls_flags = LM_LSFLAG_LOCAL; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
29b7998d DT |
63 | static void nolock_others_may_mount(lm_lockspace_t *lockspace) |
64 | { | |
65 | } | |
66 | ||
29b7998d DT |
67 | static void nolock_unmount(lm_lockspace_t *lockspace) |
68 | { | |
69 | struct nolock_lockspace *nl = (struct nolock_lockspace *)lockspace; | |
70 | kfree(nl); | |
71 | } | |
72 | ||
29b7998d DT |
73 | static void nolock_withdraw(lm_lockspace_t *lockspace) |
74 | { | |
75 | } | |
76 | ||
77 | /** | |
78 | * nolock_get_lock - get a lm_lock_t given a descripton of the lock | |
79 | * @lockspace: the lockspace the lock lives in | |
80 | * @name: the name of the lock | |
81 | * @lockp: return the lm_lock_t here | |
82 | * | |
83 | * Returns: 0 on success, -EXXX on failure | |
84 | */ | |
85 | ||
86 | static int nolock_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name, | |
87 | lm_lock_t **lockp) | |
88 | { | |
89 | *lockp = (lm_lock_t *)lockspace; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /** | |
94 | * nolock_put_lock - get rid of a lock structure | |
95 | * @lock: the lock to throw away | |
96 | * | |
97 | */ | |
98 | ||
99 | static void nolock_put_lock(lm_lock_t *lock) | |
100 | { | |
101 | } | |
102 | ||
103 | /** | |
104 | * nolock_lock - acquire a lock | |
105 | * @lock: the lock to manipulate | |
106 | * @cur_state: the current state | |
107 | * @req_state: the requested state | |
108 | * @flags: modifier flags | |
109 | * | |
110 | * Returns: A bitmap of LM_OUT_* | |
111 | */ | |
112 | ||
113 | static unsigned int nolock_lock(lm_lock_t *lock, unsigned int cur_state, | |
114 | unsigned int req_state, unsigned int flags) | |
115 | { | |
116 | return req_state | LM_OUT_CACHEABLE; | |
117 | } | |
118 | ||
119 | /** | |
120 | * nolock_unlock - unlock a lock | |
121 | * @lock: the lock to manipulate | |
122 | * @cur_state: the current state | |
123 | * | |
124 | * Returns: 0 | |
125 | */ | |
126 | ||
127 | static unsigned int nolock_unlock(lm_lock_t *lock, unsigned int cur_state) | |
128 | { | |
129 | return 0; | |
130 | } | |
131 | ||
29b7998d DT |
132 | static void nolock_cancel(lm_lock_t *lock) |
133 | { | |
134 | } | |
135 | ||
136 | /** | |
137 | * nolock_hold_lvb - hold on to a lock value block | |
138 | * @lock: the lock the LVB is associated with | |
139 | * @lvbp: return the lm_lvb_t here | |
140 | * | |
141 | * Returns: 0 on success, -EXXX on failure | |
142 | */ | |
143 | ||
144 | static int nolock_hold_lvb(lm_lock_t *lock, char **lvbp) | |
145 | { | |
146 | struct nolock_lockspace *nl = (struct nolock_lockspace *)lock; | |
147 | int error = 0; | |
148 | ||
d92a8d48 SW |
149 | *lvbp = kzalloc(nl->nl_lvb_size, GFP_KERNEL); |
150 | if (!*lvbp) | |
29b7998d DT |
151 | error = -ENOMEM; |
152 | ||
153 | return error; | |
154 | } | |
155 | ||
156 | /** | |
157 | * nolock_unhold_lvb - release a LVB | |
158 | * @lock: the lock the LVB is associated with | |
159 | * @lvb: the lock value block | |
160 | * | |
161 | */ | |
162 | ||
163 | static void nolock_unhold_lvb(lm_lock_t *lock, char *lvb) | |
164 | { | |
165 | kfree(lvb); | |
166 | } | |
167 | ||
168 | /** | |
169 | * nolock_sync_lvb - sync out the value of a lvb | |
170 | * @lock: the lock the LVB is associated with | |
171 | * @lvb: the lock value block | |
172 | * | |
173 | */ | |
174 | ||
175 | static void nolock_sync_lvb(lm_lock_t *lock, char *lvb) | |
176 | { | |
177 | } | |
178 | ||
29b7998d DT |
179 | static int nolock_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name, |
180 | struct file *file, struct file_lock *fl) | |
181 | { | |
182 | struct file_lock *tmp; | |
183 | ||
184 | lock_kernel(); | |
185 | tmp = posix_test_lock(file, fl); | |
186 | fl->fl_type = F_UNLCK; | |
187 | if (tmp) | |
188 | memcpy(fl, tmp, sizeof(struct file_lock)); | |
189 | unlock_kernel(); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
29b7998d DT |
194 | static int nolock_plock(lm_lockspace_t *lockspace, struct lm_lockname *name, |
195 | struct file *file, int cmd, struct file_lock *fl) | |
196 | { | |
197 | int error; | |
198 | lock_kernel(); | |
199 | error = posix_lock_file_wait(file, fl); | |
200 | unlock_kernel(); | |
201 | return error; | |
202 | } | |
203 | ||
29b7998d DT |
204 | static int nolock_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name, |
205 | struct file *file, struct file_lock *fl) | |
206 | { | |
207 | int error; | |
208 | lock_kernel(); | |
209 | error = posix_lock_file_wait(file, fl); | |
210 | unlock_kernel(); | |
211 | return error; | |
212 | } | |
213 | ||
29b7998d DT |
214 | static void nolock_recovery_done(lm_lockspace_t *lockspace, unsigned int jid, |
215 | unsigned int message) | |
216 | { | |
217 | } | |
218 | ||
219 | struct lm_lockops nolock_ops = { | |
220 | .lm_proto_name = "lock_nolock", | |
221 | .lm_mount = nolock_mount, | |
222 | .lm_others_may_mount = nolock_others_may_mount, | |
223 | .lm_unmount = nolock_unmount, | |
224 | .lm_withdraw = nolock_withdraw, | |
225 | .lm_get_lock = nolock_get_lock, | |
226 | .lm_put_lock = nolock_put_lock, | |
227 | .lm_lock = nolock_lock, | |
228 | .lm_unlock = nolock_unlock, | |
229 | .lm_cancel = nolock_cancel, | |
230 | .lm_hold_lvb = nolock_hold_lvb, | |
231 | .lm_unhold_lvb = nolock_unhold_lvb, | |
232 | .lm_sync_lvb = nolock_sync_lvb, | |
233 | .lm_plock_get = nolock_plock_get, | |
234 | .lm_plock = nolock_plock, | |
235 | .lm_punlock = nolock_punlock, | |
236 | .lm_recovery_done = nolock_recovery_done, | |
237 | .lm_owner = THIS_MODULE, | |
238 | }; | |
239 | ||
29b7998d DT |
240 | int __init init_nolock(void) |
241 | { | |
242 | int error; | |
243 | ||
869d81df | 244 | error = gfs_register_lockproto(&nolock_ops); |
29b7998d | 245 | if (error) { |
d92a8d48 | 246 | printk(KERN_WARNING "lock_nolock: can't register protocol: %d\n", error); |
29b7998d DT |
247 | return error; |
248 | } | |
249 | ||
d92a8d48 | 250 | printk(KERN_INFO "Lock_Nolock (built %s %s) installed\n", __DATE__, __TIME__); |
29b7998d DT |
251 | return 0; |
252 | } | |
253 | ||
29b7998d DT |
254 | void __exit exit_nolock(void) |
255 | { | |
869d81df | 256 | gfs_unregister_lockproto(&nolock_ops); |
29b7998d DT |
257 | } |
258 | ||
259 | module_init(init_nolock); | |
260 | module_exit(exit_nolock); | |
261 | ||
262 | MODULE_DESCRIPTION("GFS Nolock Locking Module"); | |
263 | MODULE_AUTHOR("Red Hat, Inc."); | |
264 | MODULE_LICENSE("GPL"); | |
265 |