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-rw-r--r--fs/dlm/recover.c958
1 files changed, 958 insertions, 0 deletions
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
new file mode 100644
index 0000000000..53917c0aa3
--- /dev/null
+++ b/fs/dlm/recover.c
@@ -0,0 +1,958 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "dir.h"
+#include "config.h"
+#include "ast.h"
+#include "memory.h"
+#include "rcom.h"
+#include "lock.h"
+#include "lowcomms.h"
+#include "member.h"
+#include "recover.h"
+
+
+/*
+ * Recovery waiting routines: these functions wait for a particular reply from
+ * a remote node, or for the remote node to report a certain status. They need
+ * to abort if the lockspace is stopped indicating a node has failed (perhaps
+ * the one being waited for).
+ */
+
+/*
+ * Wait until given function returns non-zero or lockspace is stopped
+ * (LS_RECOVERY_STOP set due to failure of a node in ls_nodes). When another
+ * function thinks it could have completed the waited-on task, they should wake
+ * up ls_wait_general to get an immediate response rather than waiting for the
+ * timeout. This uses a timeout so it can check periodically if the wait
+ * should abort due to node failure (which doesn't cause a wake_up).
+ * This should only be called by the dlm_recoverd thread.
+ */
+
+int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls))
+{
+ int error = 0;
+ int rv;
+
+ while (1) {
+ rv = wait_event_timeout(ls->ls_wait_general,
+ testfn(ls) || dlm_recovery_stopped(ls),
+ dlm_config.ci_recover_timer * HZ);
+ if (rv)
+ break;
+ if (test_bit(LSFL_RCOM_WAIT, &ls->ls_flags)) {
+ log_debug(ls, "dlm_wait_function timed out");
+ return -ETIMEDOUT;
+ }
+ }
+
+ if (dlm_recovery_stopped(ls)) {
+ log_debug(ls, "dlm_wait_function aborted");
+ error = -EINTR;
+ }
+ return error;
+}
+
+/*
+ * An efficient way for all nodes to wait for all others to have a certain
+ * status. The node with the lowest nodeid polls all the others for their
+ * status (wait_status_all) and all the others poll the node with the low id
+ * for its accumulated result (wait_status_low). When all nodes have set
+ * status flag X, then status flag X_ALL will be set on the low nodeid.
+ */
+
+uint32_t dlm_recover_status(struct dlm_ls *ls)
+{
+ uint32_t status;
+ spin_lock(&ls->ls_recover_lock);
+ status = ls->ls_recover_status;
+ spin_unlock(&ls->ls_recover_lock);
+ return status;
+}
+
+static void _set_recover_status(struct dlm_ls *ls, uint32_t status)
+{
+ ls->ls_recover_status |= status;
+}
+
+void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status)
+{
+ spin_lock(&ls->ls_recover_lock);
+ _set_recover_status(ls, status);
+ spin_unlock(&ls->ls_recover_lock);
+}
+
+static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status,
+ int save_slots, uint64_t seq)
+{
+ struct dlm_rcom *rc = ls->ls_recover_buf;
+ struct dlm_member *memb;
+ int error = 0, delay;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ delay = 0;
+ for (;;) {
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
+ goto out;
+ }
+
+ error = dlm_rcom_status(ls, memb->nodeid, 0, seq);
+ if (error)
+ goto out;
+
+ if (save_slots)
+ dlm_slot_save(ls, rc, memb);
+
+ if (le32_to_cpu(rc->rc_result) & wait_status)
+ break;
+ if (delay < 1000)
+ delay += 20;
+ msleep(delay);
+ }
+ }
+ out:
+ return error;
+}
+
+static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status,
+ uint32_t status_flags, uint64_t seq)
+{
+ struct dlm_rcom *rc = ls->ls_recover_buf;
+ int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
+
+ for (;;) {
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
+ goto out;
+ }
+
+ error = dlm_rcom_status(ls, nodeid, status_flags, seq);
+ if (error)
+ break;
+
+ if (le32_to_cpu(rc->rc_result) & wait_status)
+ break;
+ if (delay < 1000)
+ delay += 20;
+ msleep(delay);
+ }
+ out:
+ return error;
+}
+
+static int wait_status(struct dlm_ls *ls, uint32_t status, uint64_t seq)
+{
+ uint32_t status_all = status << 1;
+ int error;
+
+ if (ls->ls_low_nodeid == dlm_our_nodeid()) {
+ error = wait_status_all(ls, status, 0, seq);
+ if (!error)
+ dlm_set_recover_status(ls, status_all);
+ } else
+ error = wait_status_low(ls, status_all, 0, seq);
+
+ return error;
+}
+
+int dlm_recover_members_wait(struct dlm_ls *ls, uint64_t seq)
+{
+ struct dlm_member *memb;
+ struct dlm_slot *slots;
+ int num_slots, slots_size;
+ int error, rv;
+ uint32_t gen;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ memb->slot = -1;
+ memb->generation = 0;
+ }
+
+ if (ls->ls_low_nodeid == dlm_our_nodeid()) {
+ error = wait_status_all(ls, DLM_RS_NODES, 1, seq);
+ if (error)
+ goto out;
+
+ /* slots array is sparse, slots_size may be > num_slots */
+
+ rv = dlm_slots_assign(ls, &num_slots, &slots_size, &slots, &gen);
+ if (!rv) {
+ spin_lock(&ls->ls_recover_lock);
+ _set_recover_status(ls, DLM_RS_NODES_ALL);
+ ls->ls_num_slots = num_slots;
+ ls->ls_slots_size = slots_size;
+ ls->ls_slots = slots;
+ ls->ls_generation = gen;
+ spin_unlock(&ls->ls_recover_lock);
+ } else {
+ dlm_set_recover_status(ls, DLM_RS_NODES_ALL);
+ }
+ } else {
+ error = wait_status_low(ls, DLM_RS_NODES_ALL,
+ DLM_RSF_NEED_SLOTS, seq);
+ if (error)
+ goto out;
+
+ dlm_slots_copy_in(ls);
+ }
+ out:
+ return error;
+}
+
+int dlm_recover_directory_wait(struct dlm_ls *ls, uint64_t seq)
+{
+ return wait_status(ls, DLM_RS_DIR, seq);
+}
+
+int dlm_recover_locks_wait(struct dlm_ls *ls, uint64_t seq)
+{
+ return wait_status(ls, DLM_RS_LOCKS, seq);
+}
+
+int dlm_recover_done_wait(struct dlm_ls *ls, uint64_t seq)
+{
+ return wait_status(ls, DLM_RS_DONE, seq);
+}
+
+/*
+ * The recover_list contains all the rsb's for which we've requested the new
+ * master nodeid. As replies are returned from the resource directories the
+ * rsb's are removed from the list. When the list is empty we're done.
+ *
+ * The recover_list is later similarly used for all rsb's for which we've sent
+ * new lkb's and need to receive new corresponding lkid's.
+ *
+ * We use the address of the rsb struct as a simple local identifier for the
+ * rsb so we can match an rcom reply with the rsb it was sent for.
+ */
+
+static int recover_list_empty(struct dlm_ls *ls)
+{
+ int empty;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ empty = list_empty(&ls->ls_recover_list);
+ spin_unlock(&ls->ls_recover_list_lock);
+
+ return empty;
+}
+
+static void recover_list_add(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ if (list_empty(&r->res_recover_list)) {
+ list_add_tail(&r->res_recover_list, &ls->ls_recover_list);
+ ls->ls_recover_list_count++;
+ dlm_hold_rsb(r);
+ }
+ spin_unlock(&ls->ls_recover_list_lock);
+}
+
+static void recover_list_del(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ list_del_init(&r->res_recover_list);
+ ls->ls_recover_list_count--;
+ spin_unlock(&ls->ls_recover_list_lock);
+
+ dlm_put_rsb(r);
+}
+
+static void recover_list_clear(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r, *s;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ list_for_each_entry_safe(r, s, &ls->ls_recover_list, res_recover_list) {
+ list_del_init(&r->res_recover_list);
+ r->res_recover_locks_count = 0;
+ dlm_put_rsb(r);
+ ls->ls_recover_list_count--;
+ }
+
+ if (ls->ls_recover_list_count != 0) {
+ log_error(ls, "warning: recover_list_count %d",
+ ls->ls_recover_list_count);
+ ls->ls_recover_list_count = 0;
+ }
+ spin_unlock(&ls->ls_recover_list_lock);
+}
+
+static int recover_idr_empty(struct dlm_ls *ls)
+{
+ int empty = 1;
+
+ spin_lock(&ls->ls_recover_idr_lock);
+ if (ls->ls_recover_list_count)
+ empty = 0;
+ spin_unlock(&ls->ls_recover_idr_lock);
+
+ return empty;
+}
+
+static int recover_idr_add(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+ int rv;
+
+ idr_preload(GFP_NOFS);
+ spin_lock(&ls->ls_recover_idr_lock);
+ if (r->res_id) {
+ rv = -1;
+ goto out_unlock;
+ }
+ rv = idr_alloc(&ls->ls_recover_idr, r, 1, 0, GFP_NOWAIT);
+ if (rv < 0)
+ goto out_unlock;
+
+ r->res_id = rv;
+ ls->ls_recover_list_count++;
+ dlm_hold_rsb(r);
+ rv = 0;
+out_unlock:
+ spin_unlock(&ls->ls_recover_idr_lock);
+ idr_preload_end();
+ return rv;
+}
+
+static void recover_idr_del(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+
+ spin_lock(&ls->ls_recover_idr_lock);
+ idr_remove(&ls->ls_recover_idr, r->res_id);
+ r->res_id = 0;
+ ls->ls_recover_list_count--;
+ spin_unlock(&ls->ls_recover_idr_lock);
+
+ dlm_put_rsb(r);
+}
+
+static struct dlm_rsb *recover_idr_find(struct dlm_ls *ls, uint64_t id)
+{
+ struct dlm_rsb *r;
+
+ spin_lock(&ls->ls_recover_idr_lock);
+ r = idr_find(&ls->ls_recover_idr, (int)id);
+ spin_unlock(&ls->ls_recover_idr_lock);
+ return r;
+}
+
+static void recover_idr_clear(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ int id;
+
+ spin_lock(&ls->ls_recover_idr_lock);
+
+ idr_for_each_entry(&ls->ls_recover_idr, r, id) {
+ idr_remove(&ls->ls_recover_idr, id);
+ r->res_id = 0;
+ r->res_recover_locks_count = 0;
+ ls->ls_recover_list_count--;
+
+ dlm_put_rsb(r);
+ }
+
+ if (ls->ls_recover_list_count != 0) {
+ log_error(ls, "warning: recover_list_count %d",
+ ls->ls_recover_list_count);
+ ls->ls_recover_list_count = 0;
+ }
+ spin_unlock(&ls->ls_recover_idr_lock);
+}
+
+
+/* Master recovery: find new master node for rsb's that were
+ mastered on nodes that have been removed.
+
+ dlm_recover_masters
+ recover_master
+ dlm_send_rcom_lookup -> receive_rcom_lookup
+ dlm_dir_lookup
+ receive_rcom_lookup_reply <-
+ dlm_recover_master_reply
+ set_new_master
+ set_master_lkbs
+ set_lock_master
+*/
+
+/*
+ * Set the lock master for all LKBs in a lock queue
+ * If we are the new master of the rsb, we may have received new
+ * MSTCPY locks from other nodes already which we need to ignore
+ * when setting the new nodeid.
+ */
+
+static void set_lock_master(struct list_head *queue, int nodeid)
+{
+ struct dlm_lkb *lkb;
+
+ list_for_each_entry(lkb, queue, lkb_statequeue) {
+ if (!test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags)) {
+ lkb->lkb_nodeid = nodeid;
+ lkb->lkb_remid = 0;
+ }
+ }
+}
+
+static void set_master_lkbs(struct dlm_rsb *r)
+{
+ set_lock_master(&r->res_grantqueue, r->res_nodeid);
+ set_lock_master(&r->res_convertqueue, r->res_nodeid);
+ set_lock_master(&r->res_waitqueue, r->res_nodeid);
+}
+
+/*
+ * Propagate the new master nodeid to locks
+ * The NEW_MASTER flag tells dlm_recover_locks() which rsb's to consider.
+ * The NEW_MASTER2 flag tells recover_lvb() and recover_grant() which
+ * rsb's to consider.
+ */
+
+static void set_new_master(struct dlm_rsb *r)
+{
+ set_master_lkbs(r);
+ rsb_set_flag(r, RSB_NEW_MASTER);
+ rsb_set_flag(r, RSB_NEW_MASTER2);
+}
+
+/*
+ * We do async lookups on rsb's that need new masters. The rsb's
+ * waiting for a lookup reply are kept on the recover_list.
+ *
+ * Another node recovering the master may have sent us a rcom lookup,
+ * and our dlm_master_lookup() set it as the new master, along with
+ * NEW_MASTER so that we'll recover it here (this implies dir_nodeid
+ * equals our_nodeid below).
+ */
+
+static int recover_master(struct dlm_rsb *r, unsigned int *count, uint64_t seq)
+{
+ struct dlm_ls *ls = r->res_ls;
+ int our_nodeid, dir_nodeid;
+ int is_removed = 0;
+ int error;
+
+ if (is_master(r))
+ return 0;
+
+ is_removed = dlm_is_removed(ls, r->res_nodeid);
+
+ if (!is_removed && !rsb_flag(r, RSB_NEW_MASTER))
+ return 0;
+
+ our_nodeid = dlm_our_nodeid();
+ dir_nodeid = dlm_dir_nodeid(r);
+
+ if (dir_nodeid == our_nodeid) {
+ if (is_removed) {
+ r->res_master_nodeid = our_nodeid;
+ r->res_nodeid = 0;
+ }
+
+ /* set master of lkbs to ourself when is_removed, or to
+ another new master which we set along with NEW_MASTER
+ in dlm_master_lookup */
+ set_new_master(r);
+ error = 0;
+ } else {
+ recover_idr_add(r);
+ error = dlm_send_rcom_lookup(r, dir_nodeid, seq);
+ }
+
+ (*count)++;
+ return error;
+}
+
+/*
+ * All MSTCPY locks are purged and rebuilt, even if the master stayed the same.
+ * This is necessary because recovery can be started, aborted and restarted,
+ * causing the master nodeid to briefly change during the aborted recovery, and
+ * change back to the original value in the second recovery. The MSTCPY locks
+ * may or may not have been purged during the aborted recovery. Another node
+ * with an outstanding request in waiters list and a request reply saved in the
+ * requestqueue, cannot know whether it should ignore the reply and resend the
+ * request, or accept the reply and complete the request. It must do the
+ * former if the remote node purged MSTCPY locks, and it must do the later if
+ * the remote node did not. This is solved by always purging MSTCPY locks, in
+ * which case, the request reply would always be ignored and the request
+ * resent.
+ */
+
+static int recover_master_static(struct dlm_rsb *r, unsigned int *count)
+{
+ int dir_nodeid = dlm_dir_nodeid(r);
+ int new_master = dir_nodeid;
+
+ if (dir_nodeid == dlm_our_nodeid())
+ new_master = 0;
+
+ dlm_purge_mstcpy_locks(r);
+ r->res_master_nodeid = dir_nodeid;
+ r->res_nodeid = new_master;
+ set_new_master(r);
+ (*count)++;
+ return 0;
+}
+
+/*
+ * Go through local root resources and for each rsb which has a master which
+ * has departed, get the new master nodeid from the directory. The dir will
+ * assign mastery to the first node to look up the new master. That means
+ * we'll discover in this lookup if we're the new master of any rsb's.
+ *
+ * We fire off all the dir lookup requests individually and asynchronously to
+ * the correct dir node.
+ */
+
+int dlm_recover_masters(struct dlm_ls *ls, uint64_t seq)
+{
+ struct dlm_rsb *r;
+ unsigned int total = 0;
+ unsigned int count = 0;
+ int nodir = dlm_no_directory(ls);
+ int error;
+
+ log_rinfo(ls, "dlm_recover_masters");
+
+ down_read(&ls->ls_root_sem);
+ list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+ if (dlm_recovery_stopped(ls)) {
+ up_read(&ls->ls_root_sem);
+ error = -EINTR;
+ goto out;
+ }
+
+ lock_rsb(r);
+ if (nodir)
+ error = recover_master_static(r, &count);
+ else
+ error = recover_master(r, &count, seq);
+ unlock_rsb(r);
+ cond_resched();
+ total++;
+
+ if (error) {
+ up_read(&ls->ls_root_sem);
+ goto out;
+ }
+ }
+ up_read(&ls->ls_root_sem);
+
+ log_rinfo(ls, "dlm_recover_masters %u of %u", count, total);
+
+ error = dlm_wait_function(ls, &recover_idr_empty);
+ out:
+ if (error)
+ recover_idr_clear(ls);
+ return error;
+}
+
+int dlm_recover_master_reply(struct dlm_ls *ls, const struct dlm_rcom *rc)
+{
+ struct dlm_rsb *r;
+ int ret_nodeid, new_master;
+
+ r = recover_idr_find(ls, le64_to_cpu(rc->rc_id));
+ if (!r) {
+ log_error(ls, "dlm_recover_master_reply no id %llx",
+ (unsigned long long)le64_to_cpu(rc->rc_id));
+ goto out;
+ }
+
+ ret_nodeid = le32_to_cpu(rc->rc_result);
+
+ if (ret_nodeid == dlm_our_nodeid())
+ new_master = 0;
+ else
+ new_master = ret_nodeid;
+
+ lock_rsb(r);
+ r->res_master_nodeid = ret_nodeid;
+ r->res_nodeid = new_master;
+ set_new_master(r);
+ unlock_rsb(r);
+ recover_idr_del(r);
+
+ if (recover_idr_empty(ls))
+ wake_up(&ls->ls_wait_general);
+ out:
+ return 0;
+}
+
+
+/* Lock recovery: rebuild the process-copy locks we hold on a
+ remastered rsb on the new rsb master.
+
+ dlm_recover_locks
+ recover_locks
+ recover_locks_queue
+ dlm_send_rcom_lock -> receive_rcom_lock
+ dlm_recover_master_copy
+ receive_rcom_lock_reply <-
+ dlm_recover_process_copy
+*/
+
+
+/*
+ * keep a count of the number of lkb's we send to the new master; when we get
+ * an equal number of replies then recovery for the rsb is done
+ */
+
+static int recover_locks_queue(struct dlm_rsb *r, struct list_head *head,
+ uint64_t seq)
+{
+ struct dlm_lkb *lkb;
+ int error = 0;
+
+ list_for_each_entry(lkb, head, lkb_statequeue) {
+ error = dlm_send_rcom_lock(r, lkb, seq);
+ if (error)
+ break;
+ r->res_recover_locks_count++;
+ }
+
+ return error;
+}
+
+static int recover_locks(struct dlm_rsb *r, uint64_t seq)
+{
+ int error = 0;
+
+ lock_rsb(r);
+
+ DLM_ASSERT(!r->res_recover_locks_count, dlm_dump_rsb(r););
+
+ error = recover_locks_queue(r, &r->res_grantqueue, seq);
+ if (error)
+ goto out;
+ error = recover_locks_queue(r, &r->res_convertqueue, seq);
+ if (error)
+ goto out;
+ error = recover_locks_queue(r, &r->res_waitqueue, seq);
+ if (error)
+ goto out;
+
+ if (r->res_recover_locks_count)
+ recover_list_add(r);
+ else
+ rsb_clear_flag(r, RSB_NEW_MASTER);
+ out:
+ unlock_rsb(r);
+ return error;
+}
+
+int dlm_recover_locks(struct dlm_ls *ls, uint64_t seq)
+{
+ struct dlm_rsb *r;
+ int error, count = 0;
+
+ down_read(&ls->ls_root_sem);
+ list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+ if (is_master(r)) {
+ rsb_clear_flag(r, RSB_NEW_MASTER);
+ continue;
+ }
+
+ if (!rsb_flag(r, RSB_NEW_MASTER))
+ continue;
+
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
+ up_read(&ls->ls_root_sem);
+ goto out;
+ }
+
+ error = recover_locks(r, seq);
+ if (error) {
+ up_read(&ls->ls_root_sem);
+ goto out;
+ }
+
+ count += r->res_recover_locks_count;
+ }
+ up_read(&ls->ls_root_sem);
+
+ log_rinfo(ls, "dlm_recover_locks %d out", count);
+
+ error = dlm_wait_function(ls, &recover_list_empty);
+ out:
+ if (error)
+ recover_list_clear(ls);
+ return error;
+}
+
+void dlm_recovered_lock(struct dlm_rsb *r)
+{
+ DLM_ASSERT(rsb_flag(r, RSB_NEW_MASTER), dlm_dump_rsb(r););
+
+ r->res_recover_locks_count--;
+ if (!r->res_recover_locks_count) {
+ rsb_clear_flag(r, RSB_NEW_MASTER);
+ recover_list_del(r);
+ }
+
+ if (recover_list_empty(r->res_ls))
+ wake_up(&r->res_ls->ls_wait_general);
+}
+
+/*
+ * The lvb needs to be recovered on all master rsb's. This includes setting
+ * the VALNOTVALID flag if necessary, and determining the correct lvb contents
+ * based on the lvb's of the locks held on the rsb.
+ *
+ * RSB_VALNOTVALID is set in two cases:
+ *
+ * 1. we are master, but not new, and we purged an EX/PW lock held by a
+ * failed node (in dlm_recover_purge which set RSB_RECOVER_LVB_INVAL)
+ *
+ * 2. we are a new master, and there are only NL/CR locks left.
+ * (We could probably improve this by only invaliding in this way when
+ * the previous master left uncleanly. VMS docs mention that.)
+ *
+ * The LVB contents are only considered for changing when this is a new master
+ * of the rsb (NEW_MASTER2). Then, the rsb's lvb is taken from any lkb with
+ * mode > CR. If no lkb's exist with mode above CR, the lvb contents are taken
+ * from the lkb with the largest lvb sequence number.
+ */
+
+static void recover_lvb(struct dlm_rsb *r)
+{
+ struct dlm_lkb *big_lkb = NULL, *iter, *high_lkb = NULL;
+ uint32_t high_seq = 0;
+ int lock_lvb_exists = 0;
+ int lvblen = r->res_ls->ls_lvblen;
+
+ if (!rsb_flag(r, RSB_NEW_MASTER2) &&
+ rsb_flag(r, RSB_RECOVER_LVB_INVAL)) {
+ /* case 1 above */
+ rsb_set_flag(r, RSB_VALNOTVALID);
+ return;
+ }
+
+ if (!rsb_flag(r, RSB_NEW_MASTER2))
+ return;
+
+ /* we are the new master, so figure out if VALNOTVALID should
+ be set, and set the rsb lvb from the best lkb available. */
+
+ list_for_each_entry(iter, &r->res_grantqueue, lkb_statequeue) {
+ if (!(iter->lkb_exflags & DLM_LKF_VALBLK))
+ continue;
+
+ lock_lvb_exists = 1;
+
+ if (iter->lkb_grmode > DLM_LOCK_CR) {
+ big_lkb = iter;
+ goto setflag;
+ }
+
+ if (((int)iter->lkb_lvbseq - (int)high_seq) >= 0) {
+ high_lkb = iter;
+ high_seq = iter->lkb_lvbseq;
+ }
+ }
+
+ list_for_each_entry(iter, &r->res_convertqueue, lkb_statequeue) {
+ if (!(iter->lkb_exflags & DLM_LKF_VALBLK))
+ continue;
+
+ lock_lvb_exists = 1;
+
+ if (iter->lkb_grmode > DLM_LOCK_CR) {
+ big_lkb = iter;
+ goto setflag;
+ }
+
+ if (((int)iter->lkb_lvbseq - (int)high_seq) >= 0) {
+ high_lkb = iter;
+ high_seq = iter->lkb_lvbseq;
+ }
+ }
+
+ setflag:
+ if (!lock_lvb_exists)
+ goto out;
+
+ /* lvb is invalidated if only NL/CR locks remain */
+ if (!big_lkb)
+ rsb_set_flag(r, RSB_VALNOTVALID);
+
+ if (!r->res_lvbptr) {
+ r->res_lvbptr = dlm_allocate_lvb(r->res_ls);
+ if (!r->res_lvbptr)
+ goto out;
+ }
+
+ if (big_lkb) {
+ r->res_lvbseq = big_lkb->lkb_lvbseq;
+ memcpy(r->res_lvbptr, big_lkb->lkb_lvbptr, lvblen);
+ } else if (high_lkb) {
+ r->res_lvbseq = high_lkb->lkb_lvbseq;
+ memcpy(r->res_lvbptr, high_lkb->lkb_lvbptr, lvblen);
+ } else {
+ r->res_lvbseq = 0;
+ memset(r->res_lvbptr, 0, lvblen);
+ }
+ out:
+ return;
+}
+
+/* All master rsb's flagged RECOVER_CONVERT need to be looked at. The locks
+ converting PR->CW or CW->PR need to have their lkb_grmode set. */
+
+static void recover_conversion(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+ struct dlm_lkb *lkb;
+ int grmode = -1;
+
+ list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
+ if (lkb->lkb_grmode == DLM_LOCK_PR ||
+ lkb->lkb_grmode == DLM_LOCK_CW) {
+ grmode = lkb->lkb_grmode;
+ break;
+ }
+ }
+
+ list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
+ if (lkb->lkb_grmode != DLM_LOCK_IV)
+ continue;
+ if (grmode == -1) {
+ log_debug(ls, "recover_conversion %x set gr to rq %d",
+ lkb->lkb_id, lkb->lkb_rqmode);
+ lkb->lkb_grmode = lkb->lkb_rqmode;
+ } else {
+ log_debug(ls, "recover_conversion %x set gr %d",
+ lkb->lkb_id, grmode);
+ lkb->lkb_grmode = grmode;
+ }
+ }
+}
+
+/* We've become the new master for this rsb and waiting/converting locks may
+ need to be granted in dlm_recover_grant() due to locks that may have
+ existed from a removed node. */
+
+static void recover_grant(struct dlm_rsb *r)
+{
+ if (!list_empty(&r->res_waitqueue) || !list_empty(&r->res_convertqueue))
+ rsb_set_flag(r, RSB_RECOVER_GRANT);
+}
+
+void dlm_recover_rsbs(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ unsigned int count = 0;
+
+ down_read(&ls->ls_root_sem);
+ list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+ lock_rsb(r);
+ if (is_master(r)) {
+ if (rsb_flag(r, RSB_RECOVER_CONVERT))
+ recover_conversion(r);
+
+ /* recover lvb before granting locks so the updated
+ lvb/VALNOTVALID is presented in the completion */
+ recover_lvb(r);
+
+ if (rsb_flag(r, RSB_NEW_MASTER2))
+ recover_grant(r);
+ count++;
+ } else {
+ rsb_clear_flag(r, RSB_VALNOTVALID);
+ }
+ rsb_clear_flag(r, RSB_RECOVER_CONVERT);
+ rsb_clear_flag(r, RSB_RECOVER_LVB_INVAL);
+ rsb_clear_flag(r, RSB_NEW_MASTER2);
+ unlock_rsb(r);
+ }
+ up_read(&ls->ls_root_sem);
+
+ if (count)
+ log_rinfo(ls, "dlm_recover_rsbs %d done", count);
+}
+
+/* Create a single list of all root rsb's to be used during recovery */
+
+int dlm_create_root_list(struct dlm_ls *ls)
+{
+ struct rb_node *n;
+ struct dlm_rsb *r;
+ int i, error = 0;
+
+ down_write(&ls->ls_root_sem);
+ if (!list_empty(&ls->ls_root_list)) {
+ log_error(ls, "root list not empty");
+ error = -EINVAL;
+ goto out;
+ }
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ spin_lock(&ls->ls_rsbtbl[i].lock);
+ for (n = rb_first(&ls->ls_rsbtbl[i].keep); n; n = rb_next(n)) {
+ r = rb_entry(n, struct dlm_rsb, res_hashnode);
+ list_add(&r->res_root_list, &ls->ls_root_list);
+ dlm_hold_rsb(r);
+ }
+
+ if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[i].toss))
+ log_error(ls, "dlm_create_root_list toss not empty");
+ spin_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+ out:
+ up_write(&ls->ls_root_sem);
+ return error;
+}
+
+void dlm_release_root_list(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r, *safe;
+
+ down_write(&ls->ls_root_sem);
+ list_for_each_entry_safe(r, safe, &ls->ls_root_list, res_root_list) {
+ list_del_init(&r->res_root_list);
+ dlm_put_rsb(r);
+ }
+ up_write(&ls->ls_root_sem);
+}
+
+void dlm_clear_toss(struct dlm_ls *ls)
+{
+ struct rb_node *n, *next;
+ struct dlm_rsb *r;
+ unsigned int count = 0;
+ int i;
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ spin_lock(&ls->ls_rsbtbl[i].lock);
+ for (n = rb_first(&ls->ls_rsbtbl[i].toss); n; n = next) {
+ next = rb_next(n);
+ r = rb_entry(n, struct dlm_rsb, res_hashnode);
+ rb_erase(n, &ls->ls_rsbtbl[i].toss);
+ dlm_free_rsb(r);
+ count++;
+ }
+ spin_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+
+ if (count)
+ log_rinfo(ls, "dlm_clear_toss %u done", count);
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 08:22:58 +0000