/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* vote.c
*
* description here
*
* Copyright (C) 2003, 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/smp_lock.h>
#include <linux/kthread.h>
#include <cluster/heartbeat.h>
#include <cluster/nodemanager.h>
#include <cluster/tcp.h>
#include <dlm/dlmapi.h>
#define MLOG_MASK_PREFIX ML_VOTE
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "slot_map.h"
#include "vote.h"
#include "buffer_head_io.h"
#define OCFS2_MESSAGE_TYPE_VOTE (0x1)
#define OCFS2_MESSAGE_TYPE_RESPONSE (0x2)
struct ocfs2_msg_hdr
{
__be32 h_response_id; /* used to lookup message handle on sending
* node. */
__be32 h_request;
__be64 h_blkno;
__be32 h_generation;
__be32 h_node_num; /* node sending this particular message. */
};
/* OCFS2_MAX_FILENAME_LEN is 255 characters, but we want to align this
* for the network. */
#define OCFS2_VOTE_FILENAME_LEN 256
struct ocfs2_vote_msg
{
struct ocfs2_msg_hdr v_hdr;
union {
__be32 v_generic1;
__be32 v_orphaned_slot; /* Used during delete votes */
__be32 v_nlink; /* Used during unlink votes */
} md1; /* Message type dependant 1 */
__be32 v_unlink_namelen;
__be64 v_unlink_parent;
u8 v_unlink_dirent[OCFS2_VOTE_FILENAME_LEN];
};
/* Responses are given these values to maintain backwards
* compatibility with older ocfs2 versions */
#define OCFS2_RESPONSE_OK (0)
#define OCFS2_RESPONSE_BUSY (-16)
#define OCFS2_RESPONSE_BAD_MSG (-22)
struct ocfs2_response_msg
{
struct ocfs2_msg_hdr r_hdr;
__be32 r_response;
__be32 r_orphaned_slot;
};
struct ocfs2_vote_work {
struct list_head w_list;
struct ocfs2_vote_msg w_msg;
};
enum ocfs2_vote_request {
OCFS2_VOTE_REQ_INVALID = 0,
OCFS2_VOTE_REQ_DELETE,
OCFS2_VOTE_REQ_UNLINK,
OCFS2_VOTE_REQ_RENAME,
OCFS2_VOTE_REQ_MOUNT,
OCFS2_VOTE_REQ_UMOUNT,
OCFS2_VOTE_REQ_LAST
};
static inline int ocfs2_is_valid_vote_request(int request)
{
return OCFS2_VOTE_REQ_INVALID < request &&
request < OCFS2_VOTE_REQ_LAST;
}
typedef void (*ocfs2_net_response_callback)(void *priv,
struct ocfs2_response_msg *resp);
struct ocfs2_net_response_cb {
ocfs2_net_response_callback rc_cb;
void *rc_priv;
};
struct ocfs2_net_wait_ctxt {
struct list_head n_list;
u32 n_response_id;
wait_queue_head_t n_event;
struct ocfs2_node_map n_node_map;
int n_response; /* an agreggate response. 0 if
* all nodes are go, < 0 on any
* negative response from any
* node or network error. */
struct ocfs2_net_response_cb *n_callback;
};
static void ocfs2_process_mount_request(struct ocfs2_super *osb,
unsigned int node_num)
{
mlog(0, "MOUNT vote from node %u\n", node_num);
/* The other node only sends us this message when he has an EX
* on the superblock, so our recovery threads (if having been
* launched) are waiting on it.*/
ocfs2_recovery_map_clear(osb, node_num);
ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num);
/* We clear the umount map here because a node may have been
* previously mounted, safely unmounted but never stopped
* heartbeating - in which case we'd have a stale entry. */
ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
}
static void ocfs2_process_umount_request(struct ocfs2_super *osb,
unsigned