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"
20 struct list_head list;
23 struct dlm_message request;
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.
33 void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_message *ms)
36 int length = le16_to_cpu(ms->m_header.h_length) -
37 sizeof(struct dlm_message);
39 e = kmalloc(sizeof(struct rq_entry) + length, GFP_NOFS);
41 log_print("dlm_add_requestqueue: out of memory len %d", length);
45 e->recover_seq = ls->ls_recover_seq & 0xFFFFFFFF;
47 memcpy(&e->request, ms, le16_to_cpu(ms->m_header.h_length));
49 atomic_inc(&ls->ls_requestqueue_cnt);
50 mutex_lock(&ls->ls_requestqueue_mutex);
51 list_add_tail(&e->list, &ls->ls_requestqueue);
52 mutex_unlock(&ls->ls_requestqueue_mutex);
56 * Called by dlm_recoverd to process normal messages saved while recovery was
57 * happening. Normal locking has been enabled before this is called. dlm_recv
58 * upon receiving a message, will wait for all saved messages to be drained
59 * here before processing the message it got. If a new dlm_ls_stop() arrives
60 * while we're processing these saved messages, it may block trying to suspend
61 * dlm_recv if dlm_recv is waiting for us in dlm_wait_requestqueue. In that
62 * case, we don't abort since locking_stopped is still 0. If dlm_recv is not
63 * waiting for us, then this processing may be aborted due to locking_stopped.
66 int dlm_process_requestqueue(struct dlm_ls *ls)
69 struct dlm_message *ms;
72 mutex_lock(&ls->ls_requestqueue_mutex);
75 if (list_empty(&ls->ls_requestqueue)) {
76 mutex_unlock(&ls->ls_requestqueue_mutex);
80 e = list_entry(ls->ls_requestqueue.next, struct rq_entry, list);
81 mutex_unlock(&ls->ls_requestqueue_mutex);
85 log_limit(ls, "dlm_process_requestqueue msg %d from %d "
86 "lkid %x remid %x result %d seq %u",
87 le32_to_cpu(ms->m_type),
88 le32_to_cpu(ms->m_header.h_nodeid),
89 le32_to_cpu(ms->m_lkid), le32_to_cpu(ms->m_remid),
90 from_dlm_errno(le32_to_cpu(ms->m_result)),
93 dlm_receive_message_saved(ls, &e->request, e->recover_seq);
95 mutex_lock(&ls->ls_requestqueue_mutex);
97 if (atomic_dec_and_test(&ls->ls_requestqueue_cnt))
98 wake_up(&ls->ls_requestqueue_wait);
101 if (dlm_locking_stopped(ls)) {
102 log_debug(ls, "process_requestqueue abort running");
103 mutex_unlock(&ls->ls_requestqueue_mutex);
114 * After recovery is done, locking is resumed and dlm_recoverd takes all the
115 * saved requests and processes them as they would have been by dlm_recv. At
116 * the same time, dlm_recv will start receiving new requests from remote nodes.
117 * We want to delay dlm_recv processing new requests until dlm_recoverd has
118 * finished processing the old saved requests. We don't check for locking
119 * stopped here because dlm_ls_stop won't stop locking until it's suspended us
123 void dlm_wait_requestqueue(struct dlm_ls *ls)
125 wait_event(ls->ls_requestqueue_wait,
126 atomic_read(&ls->ls_requestqueue_cnt) == 0);
129 static int purge_request(struct dlm_ls *ls, struct dlm_message *ms, int nodeid)
131 __le32 type = ms->m_type;
133 /* the ls is being cleaned up and freed by release_lockspace */
134 if (!atomic_read(&ls->ls_count))
137 if (dlm_is_removed(ls, nodeid))
140 /* directory operations are always purged because the directory is
141 always rebuilt during recovery and the lookups resent */
143 if (type == cpu_to_le32(DLM_MSG_REMOVE) ||
144 type == cpu_to_le32(DLM_MSG_LOOKUP) ||
145 type == cpu_to_le32(DLM_MSG_LOOKUP_REPLY))
148 if (!dlm_no_directory(ls))
154 void dlm_purge_requestqueue(struct dlm_ls *ls)
156 struct dlm_message *ms;
157 struct rq_entry *e, *safe;
159 mutex_lock(&ls->ls_requestqueue_mutex);
160 list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
163 if (purge_request(ls, ms, e->nodeid)) {
165 if (atomic_dec_and_test(&ls->ls_requestqueue_cnt))
166 wake_up(&ls->ls_requestqueue_wait);
170 mutex_unlock(&ls->ls_requestqueue_mutex);