--- /dev/null
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2011 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 "lockspace.h"
+#include "member.h"
+#include "dir.h"
+#include "ast.h"
+#include "recover.h"
+#include "lowcomms.h"
+#include "lock.h"
+#include "requestqueue.h"
+#include "recoverd.h"
+
+
+/* If the start for which we're re-enabling locking (seq) has been superseded
+ by a newer stop (ls_recover_seq), we need to leave locking disabled.
+
+ We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees
+ locking stopped and b) adds a message to the requestqueue, but dlm_recoverd
+ enables locking and clears the requestqueue between a and b. */
+
+static int enable_locking(struct dlm_ls *ls, uint64_t seq)
+{
+ int error = -EINTR;
+
+ down_write(&ls->ls_recv_active);
+
+ spin_lock(&ls->ls_recover_lock);
+ if (ls->ls_recover_seq == seq) {
+ set_bit(LSFL_RUNNING, &ls->ls_flags);
+ /* unblocks processes waiting to enter the dlm */
+ up_write(&ls->ls_in_recovery);
+ clear_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
+ error = 0;
+ }
+ spin_unlock(&ls->ls_recover_lock);
+
+ up_write(&ls->ls_recv_active);
+ return error;
+}
+
+static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
+{
+ unsigned long start;
+ int error, neg = 0;
+
+ log_rinfo(ls, "dlm_recover %llu", (unsigned long long)rv->seq);
+
+ mutex_lock(&ls->ls_recoverd_active);
+
+ dlm_callback_suspend(ls);
+
+ dlm_clear_toss(ls);
+
+ /*
+ * This list of root rsb's will be the basis of most of the recovery
+ * routines.
+ */
+
+ dlm_create_root_list(ls);
+
+ /*
+ * Add or remove nodes from the lockspace's ls_nodes list.
+ */
+
+ error = dlm_recover_members(ls, rv, &neg);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_members error %d", error);
+ goto fail;
+ }
+
+ dlm_recover_dir_nodeid(ls);
+
+ ls->ls_recover_dir_sent_res = 0;
+ ls->ls_recover_dir_sent_msg = 0;
+ ls->ls_recover_locks_in = 0;
+
+ dlm_set_recover_status(ls, DLM_RS_NODES);
+
+ error = dlm_recover_members_wait(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_members_wait error %d", error);
+ goto fail;
+ }
+
+ start = jiffies;
+
+ /*
+ * Rebuild our own share of the directory by collecting from all other
+ * nodes their master rsb names that hash to us.
+ */
+
+ error = dlm_recover_directory(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_directory error %d", error);
+ goto fail;
+ }
+
+ dlm_set_recover_status(ls, DLM_RS_DIR);
+
+ error = dlm_recover_directory_wait(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_directory_wait error %d", error);
+ goto fail;
+ }
+
+ log_rinfo(ls, "dlm_recover_directory %u out %u messages",
+ ls->ls_recover_dir_sent_res, ls->ls_recover_dir_sent_msg);
+
+ /*
+ * We may have outstanding operations that are waiting for a reply from
+ * a failed node. Mark these to be resent after recovery. Unlock and
+ * cancel ops can just be completed.
+ */
+
+ dlm_recover_waiters_pre(ls);
+
+ error = dlm_recovery_stopped(ls);
+ if (error)
+ goto fail;
+
+ if (neg || dlm_no_directory(ls)) {
+ /*
+ * Clear lkb's for departed nodes.
+ */
+
+ dlm_recover_purge(ls);
+
+ /*
+ * Get new master nodeid's for rsb's that were mastered on
+ * departed nodes.
+ */
+
+ error = dlm_recover_masters(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_masters error %d", error);
+ goto fail;
+ }
+
+ /*
+ * Send our locks on remastered rsb's to the new masters.
+ */
+
+ error = dlm_recover_locks(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_locks error %d", error);
+ goto fail;
+ }
+
+ dlm_set_recover_status(ls, DLM_RS_LOCKS);
+
+ error = dlm_recover_locks_wait(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_locks_wait error %d", error);
+ goto fail;
+ }
+
+ log_rinfo(ls, "dlm_recover_locks %u in",
+ ls->ls_recover_locks_in);
+
+ /*
+ * Finalize state in master rsb's now that all locks can be
+ * checked. This includes conversion resolution and lvb
+ * settings.
+ */
+
+ dlm_recover_rsbs(ls);
+ } else {
+ /*
+ * Other lockspace members may be going through the "neg" steps
+ * while also adding us to the lockspace, in which case they'll
+ * be doing the recover_locks (RS_LOCKS) barrier.
+ */
+ dlm_set_recover_status(ls, DLM_RS_LOCKS);
+
+ error = dlm_recover_locks_wait(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_locks_wait error %d", error);
+ goto fail;
+ }
+ }
+
+ dlm_release_root_list(ls);
+
+ /*
+ * Purge directory-related requests that are saved in requestqueue.
+ * All dir requests from before recovery are invalid now due to the dir
+ * rebuild and will be resent by the requesting nodes.
+ */
+
+ dlm_purge_requestqueue(ls);
+
+ dlm_set_recover_status(ls, DLM_RS_DONE);
+
+ error = dlm_recover_done_wait(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_done_wait error %d", error);
+ goto fail;
+ }
+
+ dlm_clear_members_gone(ls);
+
+ dlm_adjust_timeouts(ls);
+
+ dlm_callback_resume(ls);
+
+ error = enable_locking(ls, rv->seq);
+ if (error) {
+ log_rinfo(ls, "enable_locking error %d", error);
+ goto fail;
+ }
+
+ error = dlm_process_requestqueue(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_process_requestqueue error %d", error);
+ goto fail;
+ }
+
+ error = dlm_recover_waiters_post(ls);
+ if (error) {
+ log_rinfo(ls, "dlm_recover_waiters_post error %d", error);
+ goto fail;
+ }
+
+ dlm_recover_grant(ls);
+
+ log_rinfo(ls, "dlm_recover %llu generation %u done: %u ms",
+ (unsigned long long)rv->seq, ls->ls_generation,
+ jiffies_to_msecs(jiffies - start));
+ mutex_unlock(&ls->ls_recoverd_active);
+
+ dlm_lsop_recover_done(ls);
+ return 0;
+
+ fail:
+ dlm_release_root_list(ls);
+ log_rinfo(ls, "dlm_recover %llu error %d",
+ (unsigned long long)rv->seq, error);
+ mutex_unlock(&ls->ls_recoverd_active);
+ return error;
+}
+
+/* The dlm_ls_start() that created the rv we take here may already have been
+ stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
+ flag set. */
+
+static void do_ls_recovery(struct dlm_ls *ls)
+{
+ struct dlm_recover *rv = NULL;
+
+ spin_lock(&ls->ls_recover_lock);
+ rv = ls->ls_recover_args;
+ ls->ls_recover_args = NULL;
+ if (rv && ls->ls_recover_seq == rv->seq)
+ clear_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
+ spin_unlock(&ls->ls_recover_lock);
+
+ if (rv) {
+ ls_recover(ls, rv);
+ kfree(rv->nodes);
+ kfree(rv);
+ }
+}
+
+static int dlm_recoverd(void *arg)
+{
+ struct dlm_ls *ls;
+
+ ls = dlm_find_lockspace_local(arg);
+ if (!ls) {
+ log_print("dlm_recoverd: no lockspace %p", arg);
+ return -1;
+ }
+
+ down_write(&ls->ls_in_recovery);
+ set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
+ wake_up(&ls->ls_recover_lock_wait);
+
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!test_bit(LSFL_RECOVER_WORK, &ls->ls_flags) &&
+ !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags))
+ schedule();
+ set_current_state(TASK_RUNNING);
+
+ if (test_and_clear_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) {
+ down_write(&ls->ls_in_recovery);
+ set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
+ wake_up(&ls->ls_recover_lock_wait);
+ }
+
+ if (test_and_clear_bit(LSFL_RECOVER_WORK, &ls->ls_flags))
+ do_ls_recovery(ls);
+ }
+
+ if (test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags))
+ up_write(&ls->ls_in_recovery);
+
+ dlm_put_lockspace(ls);
+ return 0;
+}
+
+int dlm_recoverd_start(struct dlm_ls *ls)
+{
+ struct task_struct *p;
+ int error = 0;
+
+ p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
+ if (IS_ERR(p))
+ error = PTR_ERR(p);
+ else
+ ls->ls_recoverd_task = p;
+ return error;
+}
+
+void dlm_recoverd_stop(struct dlm_ls *ls)
+{
+ kthread_stop(ls->ls_recoverd_task);
+}
+
+void dlm_recoverd_suspend(struct dlm_ls *ls)
+{
+ wake_up(&ls->ls_wait_general);
+ mutex_lock(&ls->ls_recoverd_active);
+}
+
+void dlm_recoverd_resume(struct dlm_ls *ls)
+{
+ mutex_unlock(&ls->ls_recoverd_active);
+}
+
Code Review / kvmfornfv.git / blobdiff