1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *******************************************************************************
4 **
5 ** Copyright (C) 2005-2007 Red Hat, Inc. All rights reserved.
6 **
7 **
8 *******************************************************************************
9 ******************************************************************************/
10
11 #include "dlm_internal.h"
12 #include "member.h"
13 #include "lock.h"
14 #include "dir.h"
15 #include "config.h"
16 #include "requestqueue.h"
17 #include "util.h"
18
19 struct rq_entry {
20 struct list_head list;
21 uint32_t recover_seq;
22 int nodeid;
23 struct dlm_message request;
24 };
25
26 /*
27 * Requests received while the lockspace is in recovery get added to the
28 * request queue and processed when recovery is complete. This happens when
29 * the lockspace is suspended on some nodes before it is on others, or the
30 * lockspace is enabled on some while still suspended on others.
31 */
32
33 void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid,
34 const struct dlm_message *ms)
35 {
36 struct rq_entry *e;
37 int length = le16_to_cpu(ms->m_header.h_length) -
38 sizeof(struct dlm_message);
39
40 e = kmalloc(sizeof(struct rq_entry) + length, GFP_ATOMIC);
41 if (!e) {
42 log_print("dlm_add_requestqueue: out of memory len %d", length);
43 return;
44 }
45
46 e->recover_seq = ls->ls_recover_seq & 0xFFFFFFFF;
47 e->nodeid = nodeid;
48 memcpy(&e->request, ms, sizeof(*ms));
49 memcpy(&e->request.m_extra, ms->m_extra, length);
50
51 list_add_tail(&e->list, &ls->ls_requestqueue);
52 }
53
54 /*
55 * Called by dlm_recoverd to process normal messages saved while recovery was
56 * happening. Normal locking has been enabled before this is called. dlm_recv
57 * upon receiving a message, will wait for all saved messages to be drained
58 * here before processing the message it got. If a new dlm_ls_stop() arrives
59 * while we're processing these saved messages, it may block trying to suspend
60 * dlm_recv if dlm_recv is waiting for us in dlm_wait_requestqueue. In that
61 * case, we don't abort since locking_stopped is still 0. If dlm_recv is not
62 * waiting for us, then this processing may be aborted due to locking_stopped.
63 */
64
65 int dlm_process_requestqueue(struct dlm_ls *ls)
66 {
67 struct rq_entry *e;
68 struct dlm_message *ms;
69 int error = 0;
70
71 write_lock_bh(&ls->ls_requestqueue_lock);
72 for (;;) {
73 if (list_empty(&ls->ls_requestqueue)) {
74 clear_bit(LSFL_RECV_MSG_BLOCKED, &ls->ls_flags);
75 error = 0;
76 break;
77 }
78 e = list_first_entry(&ls->ls_requestqueue, struct rq_entry, list);
79
80 ms = &e->request;
81
82 log_limit(ls, "dlm_process_requestqueue msg %d from %d "
83 "lkid %x remid %x result %d seq %u",
84 le32_to_cpu(ms->m_type),
85 le32_to_cpu(ms->m_header.h_nodeid),
86 le32_to_cpu(ms->m_lkid), le32_to_cpu(ms->m_remid),
87 from_dlm_errno(le32_to_cpu(ms->m_result)),
88 e->recover_seq);
89
90 dlm_receive_message_saved(ls, &e->request, e->recover_seq);
91 list_del(&e->list);
92 kfree(e);
93
94 if (dlm_locking_stopped(ls)) {
95 log_debug(ls, "process_requestqueue abort running");
96 error = -EINTR;
97 break;
98 }
99 write_unlock_bh(&ls->ls_requestqueue_lock);
100 schedule();
101 write_lock_bh(&ls->ls_requestqueue_lock);
102 }
103 write_unlock_bh(&ls->ls_requestqueue_lock);
104
105 return error;
106 }
107
108 static int purge_request(struct dlm_ls *ls, struct dlm_message *ms, int nodeid)
109 {
110 __le32 type = ms->m_type;
111
112 /* the ls is being cleaned up and freed by release_lockspace */
113 if (!atomic_read(&ls->ls_count))
114 return 1;
115
116 if (dlm_is_removed(ls, nodeid))
117 return 1;
118
119 /* directory operations are always purged because the directory is
120 always rebuilt during recovery and the lookups resent */
121
122 if (type == cpu_to_le32(DLM_MSG_REMOVE) ||
123 type == cpu_to_le32(DLM_MSG_LOOKUP) ||
124 type == cpu_to_le32(DLM_MSG_LOOKUP_REPLY))
125 return 1;
126
127 if (!dlm_no_directory(ls))
128 return 0;
129
130 return 1;
131 }
132
133 void dlm_purge_requestqueue(struct dlm_ls *ls)
134 {
135 struct dlm_message *ms;
136 struct rq_entry *e, *safe;
137
138 write_lock_bh(&ls->ls_requestqueue_lock);
139 list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
140 ms = &e->request;
141
142 if (purge_request(ls, ms, e->nodeid)) {
143 list_del(&e->list);
144 kfree(e);
145 }
146 }
147 write_unlock_bh(&ls->ls_requestqueue_lock);
148 }
149
150
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