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68e2b740c4
Remove node messaging code that becomes unused with the delete inode vote removal. [Removed even more cruft which I spotted during review --Mark] Signed-off-by: Tiger Yang <tiger.yang@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
758 lines
18 KiB
C
758 lines
18 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* vote.c
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*
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* description here
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*
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* Copyright (C) 2003, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/smp_lock.h>
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#include <linux/kthread.h>
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#include <cluster/heartbeat.h>
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#include <cluster/nodemanager.h>
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#include <cluster/tcp.h>
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#include <dlm/dlmapi.h>
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#define MLOG_MASK_PREFIX ML_VOTE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "heartbeat.h"
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#include "inode.h"
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#include "journal.h"
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#include "slot_map.h"
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#include "vote.h"
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#include "buffer_head_io.h"
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#define OCFS2_MESSAGE_TYPE_VOTE (0x1)
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#define OCFS2_MESSAGE_TYPE_RESPONSE (0x2)
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struct ocfs2_msg_hdr
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{
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__be32 h_response_id; /* used to lookup message handle on sending
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* node. */
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__be32 h_request;
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__be64 h_blkno;
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__be32 h_generation;
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__be32 h_node_num; /* node sending this particular message. */
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};
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struct ocfs2_vote_msg
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{
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struct ocfs2_msg_hdr v_hdr;
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__be32 v_reserved1;
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};
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/* Responses are given these values to maintain backwards
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* compatibility with older ocfs2 versions */
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#define OCFS2_RESPONSE_OK (0)
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#define OCFS2_RESPONSE_BUSY (-16)
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#define OCFS2_RESPONSE_BAD_MSG (-22)
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struct ocfs2_response_msg
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{
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struct ocfs2_msg_hdr r_hdr;
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__be32 r_response;
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};
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struct ocfs2_vote_work {
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struct list_head w_list;
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struct ocfs2_vote_msg w_msg;
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};
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enum ocfs2_vote_request {
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OCFS2_VOTE_REQ_INVALID = 0,
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OCFS2_VOTE_REQ_MOUNT,
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OCFS2_VOTE_REQ_UMOUNT,
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OCFS2_VOTE_REQ_LAST
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};
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static inline int ocfs2_is_valid_vote_request(int request)
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{
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return OCFS2_VOTE_REQ_INVALID < request &&
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request < OCFS2_VOTE_REQ_LAST;
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}
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typedef void (*ocfs2_net_response_callback)(void *priv,
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struct ocfs2_response_msg *resp);
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struct ocfs2_net_response_cb {
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ocfs2_net_response_callback rc_cb;
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void *rc_priv;
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};
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struct ocfs2_net_wait_ctxt {
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struct list_head n_list;
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u32 n_response_id;
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wait_queue_head_t n_event;
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struct ocfs2_node_map n_node_map;
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int n_response; /* an agreggate response. 0 if
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* all nodes are go, < 0 on any
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* negative response from any
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* node or network error. */
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struct ocfs2_net_response_cb *n_callback;
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};
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static void ocfs2_process_mount_request(struct ocfs2_super *osb,
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unsigned int node_num)
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{
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mlog(0, "MOUNT vote from node %u\n", node_num);
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/* The other node only sends us this message when he has an EX
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* on the superblock, so our recovery threads (if having been
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* launched) are waiting on it.*/
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ocfs2_recovery_map_clear(osb, node_num);
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ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num);
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/* We clear the umount map here because a node may have been
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* previously mounted, safely unmounted but never stopped
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* heartbeating - in which case we'd have a stale entry. */
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ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
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}
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static void ocfs2_process_umount_request(struct ocfs2_super *osb,
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unsigned int node_num)
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{
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mlog(0, "UMOUNT vote from node %u\n", node_num);
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ocfs2_node_map_clear_bit(osb, &osb->mounted_map, node_num);
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ocfs2_node_map_set_bit(osb, &osb->umount_map, node_num);
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}
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static void ocfs2_process_vote(struct ocfs2_super *osb,
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struct ocfs2_vote_msg *msg)
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{
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int net_status, vote_response;
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unsigned int node_num;
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u64 blkno;
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enum ocfs2_vote_request request;
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struct ocfs2_msg_hdr *hdr = &msg->v_hdr;
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struct ocfs2_response_msg response;
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/* decode the network mumbo jumbo into local variables. */
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request = be32_to_cpu(hdr->h_request);
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blkno = be64_to_cpu(hdr->h_blkno);
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node_num = be32_to_cpu(hdr->h_node_num);
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mlog(0, "processing vote: request = %u, blkno = %llu, node_num = %u\n",
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request, (unsigned long long)blkno, node_num);
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if (!ocfs2_is_valid_vote_request(request)) {
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mlog(ML_ERROR, "Invalid vote request %d from node %u\n",
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request, node_num);
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vote_response = OCFS2_RESPONSE_BAD_MSG;
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goto respond;
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}
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vote_response = OCFS2_RESPONSE_OK;
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switch (request) {
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case OCFS2_VOTE_REQ_UMOUNT:
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ocfs2_process_umount_request(osb, node_num);
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goto respond;
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case OCFS2_VOTE_REQ_MOUNT:
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ocfs2_process_mount_request(osb, node_num);
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goto respond;
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default:
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/* avoids a gcc warning */
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break;
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}
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respond:
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/* Response struture is small so we just put it on the stack
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* and stuff it inline. */
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memset(&response, 0, sizeof(struct ocfs2_response_msg));
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response.r_hdr.h_response_id = hdr->h_response_id;
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response.r_hdr.h_blkno = hdr->h_blkno;
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response.r_hdr.h_generation = hdr->h_generation;
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response.r_hdr.h_node_num = cpu_to_be32(osb->node_num);
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response.r_response = cpu_to_be32(vote_response);
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net_status = o2net_send_message(OCFS2_MESSAGE_TYPE_RESPONSE,
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osb->net_key,
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&response,
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sizeof(struct ocfs2_response_msg),
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node_num,
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NULL);
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/* We still want to error print for ENOPROTOOPT here. The
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* sending node shouldn't have unregistered his net handler
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* without sending an unmount vote 1st */
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if (net_status < 0
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&& net_status != -ETIMEDOUT
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&& net_status != -ENOTCONN)
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mlog(ML_ERROR, "message to node %u fails with error %d!\n",
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node_num, net_status);
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}
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static void ocfs2_vote_thread_do_work(struct ocfs2_super *osb)
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{
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unsigned long processed;
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struct ocfs2_lock_res *lockres;
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struct ocfs2_vote_work *work;
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mlog_entry_void();
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spin_lock(&osb->vote_task_lock);
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/* grab this early so we know to try again if a state change and
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* wake happens part-way through our work */
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osb->vote_work_sequence = osb->vote_wake_sequence;
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processed = osb->blocked_lock_count;
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while (processed) {
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BUG_ON(list_empty(&osb->blocked_lock_list));
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lockres = list_entry(osb->blocked_lock_list.next,
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struct ocfs2_lock_res, l_blocked_list);
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list_del_init(&lockres->l_blocked_list);
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osb->blocked_lock_count--;
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spin_unlock(&osb->vote_task_lock);
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BUG_ON(!processed);
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processed--;
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ocfs2_process_blocked_lock(osb, lockres);
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spin_lock(&osb->vote_task_lock);
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}
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while (osb->vote_count) {
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BUG_ON(list_empty(&osb->vote_list));
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work = list_entry(osb->vote_list.next,
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struct ocfs2_vote_work, w_list);
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list_del(&work->w_list);
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osb->vote_count--;
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spin_unlock(&osb->vote_task_lock);
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ocfs2_process_vote(osb, &work->w_msg);
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kfree(work);
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spin_lock(&osb->vote_task_lock);
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}
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spin_unlock(&osb->vote_task_lock);
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mlog_exit_void();
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}
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static int ocfs2_vote_thread_lists_empty(struct ocfs2_super *osb)
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{
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int empty = 0;
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spin_lock(&osb->vote_task_lock);
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if (list_empty(&osb->blocked_lock_list) &&
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list_empty(&osb->vote_list))
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empty = 1;
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spin_unlock(&osb->vote_task_lock);
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return empty;
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}
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static int ocfs2_vote_thread_should_wake(struct ocfs2_super *osb)
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{
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int should_wake = 0;
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spin_lock(&osb->vote_task_lock);
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if (osb->vote_work_sequence != osb->vote_wake_sequence)
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should_wake = 1;
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spin_unlock(&osb->vote_task_lock);
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return should_wake;
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}
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int ocfs2_vote_thread(void *arg)
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{
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int status = 0;
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struct ocfs2_super *osb = arg;
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/* only quit once we've been asked to stop and there is no more
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* work available */
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while (!(kthread_should_stop() &&
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ocfs2_vote_thread_lists_empty(osb))) {
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wait_event_interruptible(osb->vote_event,
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ocfs2_vote_thread_should_wake(osb) ||
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kthread_should_stop());
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mlog(0, "vote_thread: awoken\n");
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ocfs2_vote_thread_do_work(osb);
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}
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osb->vote_task = NULL;
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return status;
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}
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static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response_id)
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{
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struct ocfs2_net_wait_ctxt *w;
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w = kzalloc(sizeof(*w), GFP_NOFS);
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if (!w) {
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mlog_errno(-ENOMEM);
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goto bail;
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}
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INIT_LIST_HEAD(&w->n_list);
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init_waitqueue_head(&w->n_event);
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ocfs2_node_map_init(&w->n_node_map);
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w->n_response_id = response_id;
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w->n_callback = NULL;
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bail:
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return w;
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}
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static unsigned int ocfs2_new_response_id(struct ocfs2_super *osb)
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{
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unsigned int ret;
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spin_lock(&osb->net_response_lock);
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ret = ++osb->net_response_ids;
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spin_unlock(&osb->net_response_lock);
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return ret;
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}
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static void ocfs2_dequeue_net_wait_ctxt(struct ocfs2_super *osb,
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struct ocfs2_net_wait_ctxt *w)
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{
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spin_lock(&osb->net_response_lock);
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list_del(&w->n_list);
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spin_unlock(&osb->net_response_lock);
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}
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static void ocfs2_queue_net_wait_ctxt(struct ocfs2_super *osb,
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struct ocfs2_net_wait_ctxt *w)
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{
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spin_lock(&osb->net_response_lock);
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list_add_tail(&w->n_list,
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&osb->net_response_list);
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spin_unlock(&osb->net_response_lock);
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}
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static void __ocfs2_mark_node_responded(struct ocfs2_super *osb,
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struct ocfs2_net_wait_ctxt *w,
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int node_num)
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{
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assert_spin_locked(&osb->net_response_lock);
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ocfs2_node_map_clear_bit(osb, &w->n_node_map, node_num);
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if (ocfs2_node_map_is_empty(osb, &w->n_node_map))
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wake_up(&w->n_event);
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}
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/* Intended to be called from the node down callback, we fake remove
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* the node from all our response contexts */
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void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb,
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int node_num)
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{
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struct list_head *p;
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struct ocfs2_net_wait_ctxt *w = NULL;
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spin_lock(&osb->net_response_lock);
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list_for_each(p, &osb->net_response_list) {
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w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list);
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__ocfs2_mark_node_responded(osb, w, node_num);
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}
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spin_unlock(&osb->net_response_lock);
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}
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static int ocfs2_broadcast_vote(struct ocfs2_super *osb,
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struct ocfs2_vote_msg *request,
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unsigned int response_id,
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int *response,
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struct ocfs2_net_response_cb *callback)
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{
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int status, i, remote_err;
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struct ocfs2_net_wait_ctxt *w = NULL;
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int dequeued = 0;
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mlog_entry_void();
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w = ocfs2_new_net_wait_ctxt(response_id);
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if (!w) {
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status = -ENOMEM;
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mlog_errno(status);
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goto bail;
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}
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w->n_callback = callback;
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/* we're pretty much ready to go at this point, and this fills
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* in n_response which we need anyway... */
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ocfs2_queue_net_wait_ctxt(osb, w);
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i = ocfs2_node_map_iterate(osb, &osb->mounted_map, 0);
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while (i != O2NM_INVALID_NODE_NUM) {
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if (i != osb->node_num) {
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mlog(0, "trying to send request to node %i\n", i);
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ocfs2_node_map_set_bit(osb, &w->n_node_map, i);
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remote_err = 0;
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status = o2net_send_message(OCFS2_MESSAGE_TYPE_VOTE,
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osb->net_key,
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request,
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sizeof(*request),
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i,
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&remote_err);
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if (status == -ETIMEDOUT) {
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mlog(0, "remote node %d timed out!\n", i);
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status = -EAGAIN;
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goto bail;
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}
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if (remote_err < 0) {
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status = remote_err;
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mlog(0, "remote error %d on node %d!\n",
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remote_err, i);
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mlog_errno(status);
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goto bail;
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}
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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}
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i++;
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i = ocfs2_node_map_iterate(osb, &osb->mounted_map, i);
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mlog(0, "next is %d, i am %d\n", i, osb->node_num);
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}
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mlog(0, "done sending, now waiting on responses...\n");
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wait_event(w->n_event, ocfs2_node_map_is_empty(osb, &w->n_node_map));
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ocfs2_dequeue_net_wait_ctxt(osb, w);
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dequeued = 1;
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*response = w->n_response;
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status = 0;
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bail:
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if (w) {
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if (!dequeued)
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ocfs2_dequeue_net_wait_ctxt(osb, w);
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kfree(w);
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}
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mlog_exit(status);
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return status;
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}
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static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb,
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u64 blkno,
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unsigned int generation,
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enum ocfs2_vote_request type)
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{
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struct ocfs2_vote_msg *request;
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struct ocfs2_msg_hdr *hdr;
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BUG_ON(!ocfs2_is_valid_vote_request(type));
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request = kzalloc(sizeof(*request), GFP_NOFS);
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if (!request) {
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mlog_errno(-ENOMEM);
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} else {
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hdr = &request->v_hdr;
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hdr->h_node_num = cpu_to_be32(osb->node_num);
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hdr->h_request = cpu_to_be32(type);
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hdr->h_blkno = cpu_to_be64(blkno);
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hdr->h_generation = cpu_to_be32(generation);
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}
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return request;
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}
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/* Complete the buildup of a new vote request and process the
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* broadcast return value. */
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static int ocfs2_do_request_vote(struct ocfs2_super *osb,
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struct ocfs2_vote_msg *request,
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struct ocfs2_net_response_cb *callback)
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{
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int status, response = -EBUSY;
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|
unsigned int response_id;
|
|
struct ocfs2_msg_hdr *hdr;
|
|
|
|
response_id = ocfs2_new_response_id(osb);
|
|
|
|
hdr = &request->v_hdr;
|
|
hdr->h_response_id = cpu_to_be32(response_id);
|
|
|
|
status = ocfs2_broadcast_vote(osb, request, response_id, &response,
|
|
callback);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = response;
|
|
bail:
|
|
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_request_mount_vote(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct ocfs2_vote_msg *request = NULL;
|
|
|
|
request = ocfs2_new_vote_request(osb, 0ULL, 0, OCFS2_VOTE_REQ_MOUNT);
|
|
if (!request) {
|
|
status = -ENOMEM;
|
|
goto bail;
|
|
}
|
|
|
|
status = -EAGAIN;
|
|
while (status == -EAGAIN) {
|
|
if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) &&
|
|
signal_pending(current)) {
|
|
status = -ERESTARTSYS;
|
|
goto bail;
|
|
}
|
|
|
|
if (ocfs2_node_map_is_only(osb, &osb->mounted_map,
|
|
osb->node_num)) {
|
|
status = 0;
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_do_request_vote(osb, request, NULL);
|
|
}
|
|
|
|
bail:
|
|
kfree(request);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_request_umount_vote(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct ocfs2_vote_msg *request = NULL;
|
|
|
|
request = ocfs2_new_vote_request(osb, 0ULL, 0, OCFS2_VOTE_REQ_UMOUNT);
|
|
if (!request) {
|
|
status = -ENOMEM;
|
|
goto bail;
|
|
}
|
|
|
|
status = -EAGAIN;
|
|
while (status == -EAGAIN) {
|
|
/* Do not check signals on this vote... We really want
|
|
* this one to go all the way through. */
|
|
|
|
if (ocfs2_node_map_is_only(osb, &osb->mounted_map,
|
|
osb->node_num)) {
|
|
status = 0;
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_do_request_vote(osb, request, NULL);
|
|
}
|
|
|
|
bail:
|
|
kfree(request);
|
|
return status;
|
|
}
|
|
|
|
/* TODO: This should eventually be a hash table! */
|
|
static struct ocfs2_net_wait_ctxt * __ocfs2_find_net_wait_ctxt(struct ocfs2_super *osb,
|
|
u32 response_id)
|
|
{
|
|
struct list_head *p;
|
|
struct ocfs2_net_wait_ctxt *w = NULL;
|
|
|
|
list_for_each(p, &osb->net_response_list) {
|
|
w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list);
|
|
if (response_id == w->n_response_id)
|
|
break;
|
|
w = NULL;
|
|
}
|
|
|
|
return w;
|
|
}
|
|
|
|
/* Translate response codes into local node errno values */
|
|
static inline int ocfs2_translate_response(int response)
|
|
{
|
|
int ret;
|
|
|
|
switch (response) {
|
|
case OCFS2_RESPONSE_OK:
|
|
ret = 0;
|
|
break;
|
|
|
|
case OCFS2_RESPONSE_BUSY:
|
|
ret = -EBUSY;
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_handle_response_message(struct o2net_msg *msg,
|
|
u32 len,
|
|
void *data, void **ret_data)
|
|
{
|
|
unsigned int response_id, node_num;
|
|
int response_status;
|
|
struct ocfs2_super *osb = data;
|
|
struct ocfs2_response_msg *resp;
|
|
struct ocfs2_net_wait_ctxt * w;
|
|
struct ocfs2_net_response_cb *resp_cb;
|
|
|
|
resp = (struct ocfs2_response_msg *) msg->buf;
|
|
|
|
response_id = be32_to_cpu(resp->r_hdr.h_response_id);
|
|
node_num = be32_to_cpu(resp->r_hdr.h_node_num);
|
|
response_status =
|
|
ocfs2_translate_response(be32_to_cpu(resp->r_response));
|
|
|
|
mlog(0, "received response message:\n");
|
|
mlog(0, "h_response_id = %u\n", response_id);
|
|
mlog(0, "h_request = %u\n", be32_to_cpu(resp->r_hdr.h_request));
|
|
mlog(0, "h_blkno = %llu\n",
|
|
(unsigned long long)be64_to_cpu(resp->r_hdr.h_blkno));
|
|
mlog(0, "h_generation = %u\n", be32_to_cpu(resp->r_hdr.h_generation));
|
|
mlog(0, "h_node_num = %u\n", node_num);
|
|
mlog(0, "r_response = %d\n", response_status);
|
|
|
|
spin_lock(&osb->net_response_lock);
|
|
w = __ocfs2_find_net_wait_ctxt(osb, response_id);
|
|
if (!w) {
|
|
mlog(0, "request not found!\n");
|
|
goto bail;
|
|
}
|
|
resp_cb = w->n_callback;
|
|
|
|
if (response_status && (!w->n_response)) {
|
|
/* we only really need one negative response so don't
|
|
* set it twice. */
|
|
w->n_response = response_status;
|
|
}
|
|
|
|
if (resp_cb) {
|
|
spin_unlock(&osb->net_response_lock);
|
|
|
|
resp_cb->rc_cb(resp_cb->rc_priv, resp);
|
|
|
|
spin_lock(&osb->net_response_lock);
|
|
}
|
|
|
|
__ocfs2_mark_node_responded(osb, w, node_num);
|
|
bail:
|
|
spin_unlock(&osb->net_response_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ocfs2_handle_vote_message(struct o2net_msg *msg,
|
|
u32 len,
|
|
void *data, void **ret_data)
|
|
{
|
|
int status;
|
|
struct ocfs2_super *osb = data;
|
|
struct ocfs2_vote_work *work;
|
|
|
|
work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_NOFS);
|
|
if (!work) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&work->w_list);
|
|
memcpy(&work->w_msg, msg->buf, sizeof(struct ocfs2_vote_msg));
|
|
|
|
mlog(0, "scheduling vote request:\n");
|
|
mlog(0, "h_response_id = %u\n",
|
|
be32_to_cpu(work->w_msg.v_hdr.h_response_id));
|
|
mlog(0, "h_request = %u\n", be32_to_cpu(work->w_msg.v_hdr.h_request));
|
|
mlog(0, "h_blkno = %llu\n",
|
|
(unsigned long long)be64_to_cpu(work->w_msg.v_hdr.h_blkno));
|
|
mlog(0, "h_generation = %u\n",
|
|
be32_to_cpu(work->w_msg.v_hdr.h_generation));
|
|
mlog(0, "h_node_num = %u\n",
|
|
be32_to_cpu(work->w_msg.v_hdr.h_node_num));
|
|
|
|
spin_lock(&osb->vote_task_lock);
|
|
list_add_tail(&work->w_list, &osb->vote_list);
|
|
osb->vote_count++;
|
|
spin_unlock(&osb->vote_task_lock);
|
|
|
|
ocfs2_kick_vote_thread(osb);
|
|
|
|
status = 0;
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_unregister_net_handlers(struct ocfs2_super *osb)
|
|
{
|
|
if (!osb->net_key)
|
|
return;
|
|
|
|
o2net_unregister_handler_list(&osb->osb_net_handlers);
|
|
|
|
if (!list_empty(&osb->net_response_list))
|
|
mlog(ML_ERROR, "net response list not empty!\n");
|
|
|
|
osb->net_key = 0;
|
|
}
|
|
|
|
int ocfs2_register_net_handlers(struct ocfs2_super *osb)
|
|
{
|
|
int status = 0;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE,
|
|
osb->net_key,
|
|
sizeof(struct ocfs2_response_msg),
|
|
ocfs2_handle_response_message,
|
|
osb, NULL, &osb->osb_net_handlers);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = o2net_register_handler(OCFS2_MESSAGE_TYPE_VOTE,
|
|
osb->net_key,
|
|
sizeof(struct ocfs2_vote_msg),
|
|
ocfs2_handle_vote_message,
|
|
osb, NULL, &osb->osb_net_handlers);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
bail:
|
|
if (status < 0)
|
|
ocfs2_unregister_net_handlers(osb);
|
|
|
|
return status;
|
|
}
|