![David Teigland](/assets/img/avatar_default.png)
When there are no locks on a resource, the recover_locks() function fails to clear the NEW_MASTER flag by going directly to out, missing the line that clears the flag. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
766 lines
18 KiB
C
766 lines
18 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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** of the GNU General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
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#include "dlm_internal.h"
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#include "lockspace.h"
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#include "dir.h"
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#include "config.h"
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#include "ast.h"
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#include "memory.h"
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#include "rcom.h"
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#include "lock.h"
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#include "lowcomms.h"
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#include "member.h"
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#include "recover.h"
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/*
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* Recovery waiting routines: these functions wait for a particular reply from
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* a remote node, or for the remote node to report a certain status. They need
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* to abort if the lockspace is stopped indicating a node has failed (perhaps
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* the one being waited for).
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*/
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/*
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* Wait until given function returns non-zero or lockspace is stopped
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* (LS_RECOVERY_STOP set due to failure of a node in ls_nodes). When another
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* function thinks it could have completed the waited-on task, they should wake
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* up ls_wait_general to get an immediate response rather than waiting for the
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* timer to detect the result. A timer wakes us up periodically while waiting
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* to see if we should abort due to a node failure. This should only be called
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* by the dlm_recoverd thread.
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*/
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static void dlm_wait_timer_fn(unsigned long data)
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{
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struct dlm_ls *ls = (struct dlm_ls *) data;
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mod_timer(&ls->ls_timer, jiffies + (dlm_config.recover_timer * HZ));
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wake_up(&ls->ls_wait_general);
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}
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int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls))
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{
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int error = 0;
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init_timer(&ls->ls_timer);
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ls->ls_timer.function = dlm_wait_timer_fn;
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ls->ls_timer.data = (long) ls;
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ls->ls_timer.expires = jiffies + (dlm_config.recover_timer * HZ);
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add_timer(&ls->ls_timer);
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wait_event(ls->ls_wait_general, testfn(ls) || dlm_recovery_stopped(ls));
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del_timer_sync(&ls->ls_timer);
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if (dlm_recovery_stopped(ls)) {
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log_debug(ls, "dlm_wait_function aborted");
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error = -EINTR;
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}
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return error;
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}
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/*
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* An efficient way for all nodes to wait for all others to have a certain
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* status. The node with the lowest nodeid polls all the others for their
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* status (wait_status_all) and all the others poll the node with the low id
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* for its accumulated result (wait_status_low). When all nodes have set
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* status flag X, then status flag X_ALL will be set on the low nodeid.
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*/
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uint32_t dlm_recover_status(struct dlm_ls *ls)
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{
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uint32_t status;
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spin_lock(&ls->ls_recover_lock);
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status = ls->ls_recover_status;
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spin_unlock(&ls->ls_recover_lock);
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return status;
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}
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void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status)
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{
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spin_lock(&ls->ls_recover_lock);
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ls->ls_recover_status |= status;
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spin_unlock(&ls->ls_recover_lock);
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}
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static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status)
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{
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struct dlm_rcom *rc = (struct dlm_rcom *) ls->ls_recover_buf;
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struct dlm_member *memb;
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int error = 0, delay;
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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delay = 0;
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for (;;) {
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if (dlm_recovery_stopped(ls)) {
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error = -EINTR;
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goto out;
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}
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error = dlm_rcom_status(ls, memb->nodeid);
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if (error)
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goto out;
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if (rc->rc_result & wait_status)
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break;
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if (delay < 1000)
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delay += 20;
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msleep(delay);
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}
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}
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out:
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return error;
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}
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static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status)
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{
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struct dlm_rcom *rc = (struct dlm_rcom *) ls->ls_recover_buf;
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int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
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for (;;) {
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if (dlm_recovery_stopped(ls)) {
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error = -EINTR;
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goto out;
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}
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error = dlm_rcom_status(ls, nodeid);
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if (error)
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break;
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if (rc->rc_result & wait_status)
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break;
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if (delay < 1000)
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delay += 20;
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msleep(delay);
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}
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out:
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return error;
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}
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static int wait_status(struct dlm_ls *ls, uint32_t status)
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{
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uint32_t status_all = status << 1;
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int error;
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if (ls->ls_low_nodeid == dlm_our_nodeid()) {
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error = wait_status_all(ls, status);
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if (!error)
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dlm_set_recover_status(ls, status_all);
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} else
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error = wait_status_low(ls, status_all);
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return error;
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}
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int dlm_recover_members_wait(struct dlm_ls *ls)
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{
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return wait_status(ls, DLM_RS_NODES);
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}
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int dlm_recover_directory_wait(struct dlm_ls *ls)
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{
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return wait_status(ls, DLM_RS_DIR);
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}
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int dlm_recover_locks_wait(struct dlm_ls *ls)
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{
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return wait_status(ls, DLM_RS_LOCKS);
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}
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int dlm_recover_done_wait(struct dlm_ls *ls)
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{
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return wait_status(ls, DLM_RS_DONE);
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}
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/*
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* The recover_list contains all the rsb's for which we've requested the new
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* master nodeid. As replies are returned from the resource directories the
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* rsb's are removed from the list. When the list is empty we're done.
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*
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* The recover_list is later similarly used for all rsb's for which we've sent
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* new lkb's and need to receive new corresponding lkid's.
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*
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* We use the address of the rsb struct as a simple local identifier for the
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* rsb so we can match an rcom reply with the rsb it was sent for.
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*/
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static int recover_list_empty(struct dlm_ls *ls)
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{
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int empty;
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spin_lock(&ls->ls_recover_list_lock);
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empty = list_empty(&ls->ls_recover_list);
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spin_unlock(&ls->ls_recover_list_lock);
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return empty;
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}
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static void recover_list_add(struct dlm_rsb *r)
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{
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struct dlm_ls *ls = r->res_ls;
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spin_lock(&ls->ls_recover_list_lock);
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if (list_empty(&r->res_recover_list)) {
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list_add_tail(&r->res_recover_list, &ls->ls_recover_list);
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ls->ls_recover_list_count++;
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dlm_hold_rsb(r);
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}
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spin_unlock(&ls->ls_recover_list_lock);
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}
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static void recover_list_del(struct dlm_rsb *r)
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{
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struct dlm_ls *ls = r->res_ls;
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spin_lock(&ls->ls_recover_list_lock);
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list_del_init(&r->res_recover_list);
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ls->ls_recover_list_count--;
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spin_unlock(&ls->ls_recover_list_lock);
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dlm_put_rsb(r);
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}
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static struct dlm_rsb *recover_list_find(struct dlm_ls *ls, uint64_t id)
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{
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struct dlm_rsb *r = NULL;
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spin_lock(&ls->ls_recover_list_lock);
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list_for_each_entry(r, &ls->ls_recover_list, res_recover_list) {
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if (id == (unsigned long) r)
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goto out;
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}
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r = NULL;
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out:
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spin_unlock(&ls->ls_recover_list_lock);
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return r;
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}
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static void recover_list_clear(struct dlm_ls *ls)
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{
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struct dlm_rsb *r, *s;
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spin_lock(&ls->ls_recover_list_lock);
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list_for_each_entry_safe(r, s, &ls->ls_recover_list, res_recover_list) {
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list_del_init(&r->res_recover_list);
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dlm_put_rsb(r);
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ls->ls_recover_list_count--;
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}
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if (ls->ls_recover_list_count != 0) {
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log_error(ls, "warning: recover_list_count %d",
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ls->ls_recover_list_count);
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ls->ls_recover_list_count = 0;
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}
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spin_unlock(&ls->ls_recover_list_lock);
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}
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/* Master recovery: find new master node for rsb's that were
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mastered on nodes that have been removed.
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dlm_recover_masters
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recover_master
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dlm_send_rcom_lookup -> receive_rcom_lookup
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dlm_dir_lookup
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receive_rcom_lookup_reply <-
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dlm_recover_master_reply
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set_new_master
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set_master_lkbs
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set_lock_master
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*/
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/*
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* Set the lock master for all LKBs in a lock queue
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* If we are the new master of the rsb, we may have received new
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* MSTCPY locks from other nodes already which we need to ignore
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* when setting the new nodeid.
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*/
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static void set_lock_master(struct list_head *queue, int nodeid)
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{
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struct dlm_lkb *lkb;
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list_for_each_entry(lkb, queue, lkb_statequeue)
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if (!(lkb->lkb_flags & DLM_IFL_MSTCPY))
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lkb->lkb_nodeid = nodeid;
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}
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static void set_master_lkbs(struct dlm_rsb *r)
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{
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set_lock_master(&r->res_grantqueue, r->res_nodeid);
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set_lock_master(&r->res_convertqueue, r->res_nodeid);
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set_lock_master(&r->res_waitqueue, r->res_nodeid);
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}
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/*
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* Propogate the new master nodeid to locks
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* The NEW_MASTER flag tells dlm_recover_locks() which rsb's to consider.
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* The NEW_MASTER2 flag tells recover_lvb() and set_locks_purged() which
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* rsb's to consider.
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*/
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static void set_new_master(struct dlm_rsb *r, int nodeid)
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{
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lock_rsb(r);
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r->res_nodeid = nodeid;
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set_master_lkbs(r);
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rsb_set_flag(r, RSB_NEW_MASTER);
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rsb_set_flag(r, RSB_NEW_MASTER2);
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unlock_rsb(r);
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}
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/*
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* We do async lookups on rsb's that need new masters. The rsb's
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* waiting for a lookup reply are kept on the recover_list.
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*/
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static int recover_master(struct dlm_rsb *r)
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{
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struct dlm_ls *ls = r->res_ls;
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int error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid();
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dir_nodeid = dlm_dir_nodeid(r);
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if (dir_nodeid == our_nodeid) {
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error = dlm_dir_lookup(ls, our_nodeid, r->res_name,
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r->res_length, &ret_nodeid);
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if (error)
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log_error(ls, "recover dir lookup error %d", error);
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if (ret_nodeid == our_nodeid)
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ret_nodeid = 0;
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set_new_master(r, ret_nodeid);
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} else {
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recover_list_add(r);
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error = dlm_send_rcom_lookup(r, dir_nodeid);
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}
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return error;
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}
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/*
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* When not using a directory, most resource names will hash to a new static
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* master nodeid and the resource will need to be remastered.
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*/
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static int recover_master_static(struct dlm_rsb *r)
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{
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int master = dlm_dir_nodeid(r);
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if (master == dlm_our_nodeid())
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master = 0;
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if (r->res_nodeid != master) {
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if (is_master(r))
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dlm_purge_mstcpy_locks(r);
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set_new_master(r, master);
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return 1;
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}
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return 0;
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}
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/*
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* Go through local root resources and for each rsb which has a master which
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* has departed, get the new master nodeid from the directory. The dir will
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* assign mastery to the first node to look up the new master. That means
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* we'll discover in this lookup if we're the new master of any rsb's.
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*
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* We fire off all the dir lookup requests individually and asynchronously to
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* the correct dir node.
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*/
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int dlm_recover_masters(struct dlm_ls *ls)
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{
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struct dlm_rsb *r;
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int error = 0, count = 0;
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log_debug(ls, "dlm_recover_masters");
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down_read(&ls->ls_root_sem);
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list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
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if (dlm_recovery_stopped(ls)) {
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up_read(&ls->ls_root_sem);
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error = -EINTR;
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goto out;
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}
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if (dlm_no_directory(ls))
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count += recover_master_static(r);
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else if (!is_master(r) && dlm_is_removed(ls, r->res_nodeid)) {
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recover_master(r);
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count++;
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}
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schedule();
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}
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up_read(&ls->ls_root_sem);
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log_debug(ls, "dlm_recover_masters %d resources", count);
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error = dlm_wait_function(ls, &recover_list_empty);
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out:
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if (error)
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recover_list_clear(ls);
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return error;
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}
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int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
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{
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struct dlm_rsb *r;
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int nodeid;
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r = recover_list_find(ls, rc->rc_id);
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if (!r) {
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log_error(ls, "dlm_recover_master_reply no id %llx",
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(unsigned long long)rc->rc_id);
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goto out;
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}
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nodeid = rc->rc_result;
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if (nodeid == dlm_our_nodeid())
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nodeid = 0;
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set_new_master(r, nodeid);
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recover_list_del(r);
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if (recover_list_empty(ls))
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wake_up(&ls->ls_wait_general);
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out:
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return 0;
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}
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/* Lock recovery: rebuild the process-copy locks we hold on a
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remastered rsb on the new rsb master.
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dlm_recover_locks
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recover_locks
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recover_locks_queue
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dlm_send_rcom_lock -> receive_rcom_lock
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dlm_recover_master_copy
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receive_rcom_lock_reply <-
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dlm_recover_process_copy
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*/
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|
|
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/*
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* keep a count of the number of lkb's we send to the new master; when we get
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* an equal number of replies then recovery for the rsb is done
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*/
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|
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static int recover_locks_queue(struct dlm_rsb *r, struct list_head *head)
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{
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struct dlm_lkb *lkb;
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int error = 0;
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list_for_each_entry(lkb, head, lkb_statequeue) {
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error = dlm_send_rcom_lock(r, lkb);
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if (error)
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break;
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r->res_recover_locks_count++;
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}
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return error;
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}
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|
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static int recover_locks(struct dlm_rsb *r)
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{
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int error = 0;
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lock_rsb(r);
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DLM_ASSERT(!r->res_recover_locks_count, dlm_dump_rsb(r););
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error = recover_locks_queue(r, &r->res_grantqueue);
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if (error)
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goto out;
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error = recover_locks_queue(r, &r->res_convertqueue);
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if (error)
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goto out;
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error = recover_locks_queue(r, &r->res_waitqueue);
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if (error)
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goto out;
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if (r->res_recover_locks_count)
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recover_list_add(r);
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else
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rsb_clear_flag(r, RSB_NEW_MASTER);
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out:
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unlock_rsb(r);
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return error;
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}
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|
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int dlm_recover_locks(struct dlm_ls *ls)
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{
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struct dlm_rsb *r;
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int error, count = 0;
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|
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log_debug(ls, "dlm_recover_locks");
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|
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down_read(&ls->ls_root_sem);
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list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
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if (is_master(r)) {
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rsb_clear_flag(r, RSB_NEW_MASTER);
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continue;
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}
|
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|
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if (!rsb_flag(r, RSB_NEW_MASTER))
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continue;
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|
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if (dlm_recovery_stopped(ls)) {
|
|
error = -EINTR;
|
|
up_read(&ls->ls_root_sem);
|
|
goto out;
|
|
}
|
|
|
|
error = recover_locks(r);
|
|
if (error) {
|
|
up_read(&ls->ls_root_sem);
|
|
goto out;
|
|
}
|
|
|
|
count += r->res_recover_locks_count;
|
|
}
|
|
up_read(&ls->ls_root_sem);
|
|
|
|
log_debug(ls, "dlm_recover_locks %d locks", count);
|
|
|
|
error = dlm_wait_function(ls, &recover_list_empty);
|
|
out:
|
|
if (error)
|
|
recover_list_clear(ls);
|
|
else
|
|
dlm_set_recover_status(ls, DLM_RS_LOCKS);
|
|
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 if there are only NL/CR locks on the rsb. If it
|
|
* was already set prior to recovery, it's not cleared, regardless of locks.
|
|
*
|
|
* 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 *lkb, *high_lkb = NULL;
|
|
uint32_t high_seq = 0;
|
|
int lock_lvb_exists = 0;
|
|
int big_lock_exists = 0;
|
|
int lvblen = r->res_ls->ls_lvblen;
|
|
|
|
list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
|
|
if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
|
|
continue;
|
|
|
|
lock_lvb_exists = 1;
|
|
|
|
if (lkb->lkb_grmode > DLM_LOCK_CR) {
|
|
big_lock_exists = 1;
|
|
goto setflag;
|
|
}
|
|
|
|
if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
|
|
high_lkb = lkb;
|
|
high_seq = lkb->lkb_lvbseq;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
|
|
if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
|
|
continue;
|
|
|
|
lock_lvb_exists = 1;
|
|
|
|
if (lkb->lkb_grmode > DLM_LOCK_CR) {
|
|
big_lock_exists = 1;
|
|
goto setflag;
|
|
}
|
|
|
|
if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
|
|
high_lkb = lkb;
|
|
high_seq = lkb->lkb_lvbseq;
|
|
}
|
|
}
|
|
|
|
setflag:
|
|
if (!lock_lvb_exists)
|
|
goto out;
|
|
|
|
if (!big_lock_exists)
|
|
rsb_set_flag(r, RSB_VALNOTVALID);
|
|
|
|
/* don't mess with the lvb unless we're the new master */
|
|
if (!rsb_flag(r, RSB_NEW_MASTER2))
|
|
goto out;
|
|
|
|
if (!r->res_lvbptr) {
|
|
r->res_lvbptr = allocate_lvb(r->res_ls);
|
|
if (!r->res_lvbptr)
|
|
goto out;
|
|
}
|
|
|
|
if (big_lock_exists) {
|
|
r->res_lvbseq = lkb->lkb_lvbseq;
|
|
memcpy(r->res_lvbptr, 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_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)
|
|
lkb->lkb_grmode = lkb->lkb_rqmode;
|
|
else
|
|
lkb->lkb_grmode = grmode;
|
|
}
|
|
}
|
|
|
|
/* We've become the new master for this rsb and waiting/converting locks may
|
|
need to be granted in dlm_grant_after_purge() due to locks that may have
|
|
existed from a removed node. */
|
|
|
|
static void set_locks_purged(struct dlm_rsb *r)
|
|
{
|
|
if (!list_empty(&r->res_waitqueue) || !list_empty(&r->res_convertqueue))
|
|
rsb_set_flag(r, RSB_LOCKS_PURGED);
|
|
}
|
|
|
|
void dlm_recover_rsbs(struct dlm_ls *ls)
|
|
{
|
|
struct dlm_rsb *r;
|
|
int count = 0;
|
|
|
|
log_debug(ls, "dlm_recover_rsbs");
|
|
|
|
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);
|
|
if (rsb_flag(r, RSB_NEW_MASTER2))
|
|
set_locks_purged(r);
|
|
recover_lvb(r);
|
|
count++;
|
|
}
|
|
rsb_clear_flag(r, RSB_RECOVER_CONVERT);
|
|
rsb_clear_flag(r, RSB_NEW_MASTER2);
|
|
unlock_rsb(r);
|
|
}
|
|
up_read(&ls->ls_root_sem);
|
|
|
|
log_debug(ls, "dlm_recover_rsbs %d rsbs", 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 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++) {
|
|
read_lock(&ls->ls_rsbtbl[i].lock);
|
|
list_for_each_entry(r, &ls->ls_rsbtbl[i].list, res_hashchain) {
|
|
list_add(&r->res_root_list, &ls->ls_root_list);
|
|
dlm_hold_rsb(r);
|
|
}
|
|
read_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_list(struct dlm_ls *ls)
|
|
{
|
|
struct dlm_rsb *r, *safe;
|
|
int i;
|
|
|
|
for (i = 0; i < ls->ls_rsbtbl_size; i++) {
|
|
write_lock(&ls->ls_rsbtbl[i].lock);
|
|
list_for_each_entry_safe(r, safe, &ls->ls_rsbtbl[i].toss,
|
|
res_hashchain) {
|
|
list_del(&r->res_hashchain);
|
|
free_rsb(r);
|
|
}
|
|
write_unlock(&ls->ls_rsbtbl[i].lock);
|
|
}
|
|
}
|
|
|