2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 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 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/types.h>
16 #include <linux/smp_lock.h>
18 #include "../../lm_interface.h"
20 struct nolock_lockspace {
21 unsigned int nl_lvb_size;
24 static struct lm_lockops nolock_ops;
26 static int nolock_mount(char *table_name, char *host_data,
27 lm_callback_t cb, struct gfs2_sbd *sdp,
28 unsigned int min_lvb_size, int flags,
29 struct lm_lockstruct *lockstruct,
30 struct kobject *fskobj)
34 struct nolock_lockspace *nl;
36 c = strstr(host_data, "jid=");
41 sscanf(c, "%u", &jid);
44 nl = kzalloc(sizeof(struct nolock_lockspace), GFP_KERNEL);
48 nl->nl_lvb_size = min_lvb_size;
50 lockstruct->ls_jid = jid;
51 lockstruct->ls_first = 1;
52 lockstruct->ls_lvb_size = min_lvb_size;
53 lockstruct->ls_lockspace = (lm_lockspace_t *)nl;
54 lockstruct->ls_ops = &nolock_ops;
55 lockstruct->ls_flags = LM_LSFLAG_LOCAL;
60 static void nolock_others_may_mount(lm_lockspace_t *lockspace)
64 static void nolock_unmount(lm_lockspace_t *lockspace)
66 struct nolock_lockspace *nl = (struct nolock_lockspace *)lockspace;
70 static void nolock_withdraw(lm_lockspace_t *lockspace)
75 * nolock_get_lock - get a lm_lock_t given a descripton of the lock
76 * @lockspace: the lockspace the lock lives in
77 * @name: the name of the lock
78 * @lockp: return the lm_lock_t here
80 * Returns: 0 on success, -EXXX on failure
83 static int nolock_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name,
86 *lockp = (lm_lock_t *)lockspace;
91 * nolock_put_lock - get rid of a lock structure
92 * @lock: the lock to throw away
96 static void nolock_put_lock(lm_lock_t *lock)
101 * nolock_lock - acquire a lock
102 * @lock: the lock to manipulate
103 * @cur_state: the current state
104 * @req_state: the requested state
105 * @flags: modifier flags
107 * Returns: A bitmap of LM_OUT_*
110 static unsigned int nolock_lock(lm_lock_t *lock, unsigned int cur_state,
111 unsigned int req_state, unsigned int flags)
113 return req_state | LM_OUT_CACHEABLE;
117 * nolock_unlock - unlock a lock
118 * @lock: the lock to manipulate
119 * @cur_state: the current state
124 static unsigned int nolock_unlock(lm_lock_t *lock, unsigned int cur_state)
129 static void nolock_cancel(lm_lock_t *lock)
134 * nolock_hold_lvb - hold on to a lock value block
135 * @lock: the lock the LVB is associated with
136 * @lvbp: return the lm_lvb_t here
138 * Returns: 0 on success, -EXXX on failure
141 static int nolock_hold_lvb(lm_lock_t *lock, char **lvbp)
143 struct nolock_lockspace *nl = (struct nolock_lockspace *)lock;
146 *lvbp = kzalloc(nl->nl_lvb_size, GFP_KERNEL);
154 * nolock_unhold_lvb - release a LVB
155 * @lock: the lock the LVB is associated with
156 * @lvb: the lock value block
160 static void nolock_unhold_lvb(lm_lock_t *lock, char *lvb)
165 static int nolock_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name,
166 struct file *file, struct file_lock *fl)
168 struct file_lock tmp;
171 ret = posix_test_lock(file, fl, &tmp);
172 fl->fl_type = F_UNLCK;
174 memcpy(fl, &tmp, sizeof(struct file_lock));
179 static int nolock_plock(lm_lockspace_t *lockspace, struct lm_lockname *name,
180 struct file *file, int cmd, struct file_lock *fl)
183 error = posix_lock_file_wait(file, fl);
187 static int nolock_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name,
188 struct file *file, struct file_lock *fl)
191 error = posix_lock_file_wait(file, fl);
195 static void nolock_recovery_done(lm_lockspace_t *lockspace, unsigned int jid,
196 unsigned int message)
200 static struct lm_lockops nolock_ops = {
201 .lm_proto_name = "lock_nolock",
202 .lm_mount = nolock_mount,
203 .lm_others_may_mount = nolock_others_may_mount,
204 .lm_unmount = nolock_unmount,
205 .lm_withdraw = nolock_withdraw,
206 .lm_get_lock = nolock_get_lock,
207 .lm_put_lock = nolock_put_lock,
208 .lm_lock = nolock_lock,
209 .lm_unlock = nolock_unlock,
210 .lm_cancel = nolock_cancel,
211 .lm_hold_lvb = nolock_hold_lvb,
212 .lm_unhold_lvb = nolock_unhold_lvb,
213 .lm_plock_get = nolock_plock_get,
214 .lm_plock = nolock_plock,
215 .lm_punlock = nolock_punlock,
216 .lm_recovery_done = nolock_recovery_done,
217 .lm_owner = THIS_MODULE,
220 static int __init init_nolock(void)
224 error = gfs2_register_lockproto(&nolock_ops);
227 "lock_nolock: can't register protocol: %d\n", error);
232 "Lock_Nolock (built %s %s) installed\n", __DATE__, __TIME__);
236 static void __exit exit_nolock(void)
238 gfs2_unregister_lockproto(&nolock_ops);
241 module_init(init_nolock);
242 module_exit(exit_nolock);
244 MODULE_DESCRIPTION("GFS Nolock Locking Module");
245 MODULE_AUTHOR("Red Hat, Inc.");
246 MODULE_LICENSE("GPL");