1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/******************************************************************************
*******************************************************************************
**
** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
** of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#include "dlm_internal.h"
#include "member.h"
#include "lock.h"
#include "dir.h"
#include "config.h"
#include "requestqueue.h"
struct rq_entry {
struct list_head list;
int nodeid;
char request[1];
};
/*
* Requests received while the lockspace is in recovery get added to the
* request queue and processed when recovery is complete. This happens when
* the lockspace is suspended on some nodes before it is on others, or the
* lockspace is enabled on some while still suspended on others.
*/
void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd)
{
struct rq_entry *e;
int length = hd->h_length;
if (dlm_is_removed(ls, nodeid))
return;
e = kmalloc(sizeof(struct rq_entry) + length, GFP_KERNEL);
if (!e) {
log_print("dlm_add_requestqueue: out of memory\n");
return;
}
e->nodeid = nodeid;
memcpy(e->request, hd, length);
down(&ls->ls_requestqueue_lock);
list_add_tail(&e->list, &ls->ls_requestqueue);
up(&ls->ls_requestqueue_lock);
}
int dlm_process_requestqueue(struct dlm_ls *ls)
{
struct rq_entry *e;
struct dlm_header *hd;
int error = 0;
down(&ls->ls_requestqueue_lock);
for (;;) {
if (list_empty(&ls->ls_requestqueue)) {
up(&ls->ls_requestqueue_lock);
error = 0;
break;
}
e = list_entry(ls->ls_requestqueue.next, struct rq_entry, list);
up(&ls->ls_requestqueue_lock);
hd = (struct dlm_header *) e->request;
error = dlm_receive_message(hd, e->nodeid, TRUE);
if (error == -EINTR) {
/* entry is left on requestqueue */
log_debug(ls, "process_requestqueue abort eintr");
break;
}
down(&ls->ls_requestqueue_lock);
list_del(&e->list);
kfree(e);
if (dlm_locking_stopped(ls)) {
log_debug(ls, "process_requestqueue abort running");
up(&ls->ls_requestqueue_lock);
error = -EINTR;
break;
}
schedule();
}
return error;
}
/*
* After recovery is done, locking is resumed and dlm_recoverd takes all the
* saved requests and processes them as they would have been by dlm_recvd. At
* the same time, dlm_recvd will start receiving new requests from remote
* nodes. We want to delay dlm_recvd processing new requests until
* dlm_recoverd has finished processing the old saved requests.
*/
void dlm_wait_requestqueue(struct dlm_ls *ls)
{
for (;;) {
down(&ls->ls_requestqueue_lock);
if (list_empty(&ls->ls_requestqueue))
break;
if (dlm_locking_stopped(ls))
break;
up(&ls->ls_requestqueue_lock);
schedule();
}
up(&ls->ls_requestqueue_lock);
}
static int purge_request(struct dlm_ls *ls, struct dlm_message *ms, int nodeid)
{
uint32_t type = ms->m_type;
if (dlm_is_removed(ls, nodeid))
return 1;
/* directory operations are always purged because the directory is
always rebuilt during recovery and the lookups resent */
if (type == DLM_MSG_REMOVE ||
type == DLM_MSG_LOOKUP ||
type == DLM_MSG_LOOKUP_REPLY)
return 1;
if (!dlm_no_directory(ls))
return 0;
/* with no directory, the master is likely to change as a part of
recovery; requests to/from the defunct master need to be purged */
switch (type) {
case DLM_MSG_REQUEST:
case DLM_MSG_CONVERT:
case DLM_MSG_UNLOCK:
case DLM_MSG_CANCEL:
/* we're no longer the master of this resource, the sender
will resend to the new master (see waiter_needs_recovery) */
if (dlm_hash2nodeid(ls, ms->m_hash) != dlm_our_nodeid())
return 1;
break;
case DLM_MSG_REQUEST_REPLY:
case DLM_MSG_CONVERT_REPLY:
case DLM_MSG_UNLOCK_REPLY:
case DLM_MSG_CANCEL_REPLY:
case DLM_MSG_GRANT:
/* this reply is from the former master of the resource,
we'll resend to the new master if needed */
if (dlm_hash2nodeid(ls, ms->m_hash) != nodeid)
return 1;
break;
}
return 0;
}
void dlm_purge_requestqueue(struct dlm_ls *ls)
{
struct dlm_message *ms;
struct rq_entry *e, *safe;
down(&ls->ls_requestqueue_lock);
list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
ms = (struct dlm_message *) e->request;
if (purge_request(ls, ms, e->nodeid)) {
list_del(&e->list);
kfree(e);
}
}
up(&ls->ls_requestqueue_lock);
}
|
