1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *******************************************************************************
5 ** Copyright (C) 2005-2007 Red Hat, Inc. All rights reserved.
8 *******************************************************************************
9 ******************************************************************************/
11 #include "dlm_internal.h"
16 #include "requestqueue.h"
19 struct list_head list;
22 struct dlm_message request;
26 * Requests received while the lockspace is in recovery get added to the
27 * request queue and processed when recovery is complete. This happens when
28 * the lockspace is suspended on some nodes before it is on others, or the
29 * lockspace is enabled on some while still suspended on others.
32 void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_message *ms)
35 int length = ms->m_header.h_length - sizeof(struct dlm_message);
37 e = kmalloc(sizeof(struct rq_entry) + length, GFP_NOFS);
39 log_print("dlm_add_requestqueue: out of memory len %d", length);
43 e->recover_seq = ls->ls_recover_seq & 0xFFFFFFFF;
45 memcpy(&e->request, ms, ms->m_header.h_length);
47 mutex_lock(&ls->ls_requestqueue_mutex);
48 list_add_tail(&e->list, &ls->ls_requestqueue);
49 mutex_unlock(&ls->ls_requestqueue_mutex);
53 * Called by dlm_recoverd to process normal messages saved while recovery was
54 * happening. Normal locking has been enabled before this is called. dlm_recv
55 * upon receiving a message, will wait for all saved messages to be drained
56 * here before processing the message it got. If a new dlm_ls_stop() arrives
57 * while we're processing these saved messages, it may block trying to suspend
58 * dlm_recv if dlm_recv is waiting for us in dlm_wait_requestqueue. In that
59 * case, we don't abort since locking_stopped is still 0. If dlm_recv is not
60 * waiting for us, then this processing may be aborted due to locking_stopped.
63 int dlm_process_requestqueue(struct dlm_ls *ls)
66 struct dlm_message *ms;
69 mutex_lock(&ls->ls_requestqueue_mutex);
72 if (list_empty(&ls->ls_requestqueue)) {
73 mutex_unlock(&ls->ls_requestqueue_mutex);
77 e = list_entry(ls->ls_requestqueue.next, struct rq_entry, list);
78 mutex_unlock(&ls->ls_requestqueue_mutex);
82 log_limit(ls, "dlm_process_requestqueue msg %d from %d "
83 "lkid %x remid %x result %d seq %u",
84 ms->m_type, ms->m_header.h_nodeid,
85 ms->m_lkid, ms->m_remid, ms->m_result,
88 dlm_receive_message_saved(ls, &e->request, e->recover_seq);
90 mutex_lock(&ls->ls_requestqueue_mutex);
94 if (dlm_locking_stopped(ls)) {
95 log_debug(ls, "process_requestqueue abort running");
96 mutex_unlock(&ls->ls_requestqueue_mutex);
107 * After recovery is done, locking is resumed and dlm_recoverd takes all the
108 * saved requests and processes them as they would have been by dlm_recv. At
109 * the same time, dlm_recv will start receiving new requests from remote nodes.
110 * We want to delay dlm_recv processing new requests until dlm_recoverd has
111 * finished processing the old saved requests. We don't check for locking
112 * stopped here because dlm_ls_stop won't stop locking until it's suspended us
116 void dlm_wait_requestqueue(struct dlm_ls *ls)
119 mutex_lock(&ls->ls_requestqueue_mutex);
120 if (list_empty(&ls->ls_requestqueue))
122 mutex_unlock(&ls->ls_requestqueue_mutex);
125 mutex_unlock(&ls->ls_requestqueue_mutex);
128 static int purge_request(struct dlm_ls *ls, struct dlm_message *ms, int nodeid)
130 uint32_t type = ms->m_type;
132 /* the ls is being cleaned up and freed by release_lockspace */
136 if (dlm_is_removed(ls, nodeid))
139 /* directory operations are always purged because the directory is
140 always rebuilt during recovery and the lookups resent */
142 if (type == DLM_MSG_REMOVE ||
143 type == DLM_MSG_LOOKUP ||
144 type == DLM_MSG_LOOKUP_REPLY)
147 if (!dlm_no_directory(ls))
153 void dlm_purge_requestqueue(struct dlm_ls *ls)
155 struct dlm_message *ms;
156 struct rq_entry *e, *safe;
158 mutex_lock(&ls->ls_requestqueue_mutex);
159 list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
162 if (purge_request(ls, ms, e->nodeid)) {
167 mutex_unlock(&ls->ls_requestqueue_mutex);